In 1923, the British Government exclusive concessions of theUSA and South African mining territory granted groups over large areas inZambia (then Northern Rhodesian). Copper began in 1927 at the Chambisi mine in “Copperbelt Province”. Development of mining inZambia was on the agenda of the first years of colonization. The British South Africa company in 1889 ceased to “extend the railway and telegraph network in the North to the Zambezi River, to promote the migration and colonization and trade and mining concessions” to develop. Until 1923,Zambia was maintained within the direct control of the company. This period created a large number of small businesses for prospecting and extraction. Many prospectors thoughtZambia was a secondSouth Africa, with a wealth of precious metals, but soon had ambitions to copper exploitation limit. TheRhodesia copper company was founded in 1902 and began the copper mines of Kafue and Bwana Mkubwa develop.

In 1920, two other companies that were associated with copper Rhodesia exclusive mineral rights granted set up of the copper company venture from the British South Africa on an area of 80,000 square kilometers, on the border with the Belgian Congo (Zaire now is). Another mining company,Tanganyika concessions already 1899 established mining rights inZambia was given by British South Africa, andZaire by the King of the Belgians. Founded in 1906, the company in cooperation with the Belgian State, you the Union Minière HautKatanga which much later was in theKatanga secession for the independence of theCongo. Two companies then out: Rhodesian selection trust and Rhodesian Anglo American Corporation, the Zambian mines for more than 40 years were the control. In 1930, around 6,000 tonnes per year and until 1940 was 266,000 tonnes per year, the copper production inZambia. Copper mining decreased with the Second World War but in the 1950s, the production of 280,000 to 568.000 tons per year increased. In the 1960s was much slower growth in the field of mining and copper output increased by 30% between 1960 and 1970. Here the production growth reflects the worldwide demand for copper, then very quickly increases tend to stabilize the.

In the 1970s, the mining companies were copper production nationalized peaked at more than 750,000 tonnes per year achieved. Such a level should be achieved never again in the 1970s a decade that the crisis of copper marked specialisation inZambia despite huge reserves. In the early 1980’s copper output was only approximately 550,000 tons. In many waysZaire was similar to that experience. As inZambia, the development of the mining industry had the basis of a colonization by financial capital since the beginning of the century led been. The first copper Mills back until 1911 in Lubumbashi. Invested in the 1930s, the Belgian financial groups strongly in mining. But unlike inZambia, the copper mining inZaire grew relatively faster in the 1960s and 1970s, than it had in the 1940s and 1950s. 237,000 To 500,000 tons copper output rose between 1958 and 1974. Between the wars, copper specialization in Central and southern Africa was already well developed, since about a fifth of world production, provided these areas until 1970, when she began to fall. Among other metallic minerals, chromium as important in this time, since Africa was also provided one-fifth of world production. Iron year’s production much later, during the 1950s and 1960s. As a leading global manufacturer of crushing and milling equipment, we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete stone crushing station. We also supply individual jaw crusher and Raymond mill as well as spare parts of them.

General prognosis that deals with the development of surface exploitation of coal inYugoslavia, along with ecological issues also covers large energy and materials consumption in this field as a strong limiting factor. Such estimation is based on the ever increasing requirements for energy. Spare parts and various materials that in surface exploitation of coal are growing with increase of the physical volume of production.

The complex analysis of the factors influencing consumption of energy and materials in the surface exploitation recognizes three groups of main factors such as natural, technological and organizational. The group of natural factors covers separation of deposits, relief of terrain, coefficient of overburden, physic-mechanical properties of the deposit, and depth of mining, mineral materials quality and length of transportation roads. Technological factors include structural equipment design, project designs, installed power, method of excavation, loading and transportation, method of piling, development of excavated faces, useful value of mined materials and mineral processing. Quality mineral materials and the length of transportation roads can also be listed among the technological factors. The organizational factors are represented by: managing of process, qualification of stuff, maintenance of mechanization and monitoring the energy as well as material consumption.

Evaluation of the existing position of energy and material consumption at open pit mines inYugoslavia under the stated influential factors indicates that the possibilities for consumption are present. The consumption could be realized if the whole problem is thoroughly studied and if systematic monitoring, analyzing and planning all the standards as concerns the conditions characteristic for the open pit is provided for. The existing Yugoslav practice applied in the surface exploitation, the principles of planning and monitoring the energy and material consumption have not been regulated by the unique methodology. The principles of planning the material consumption have mainly been grounded on monitoring the empirical indicators. The data from previous years arc mostly taken and the consumption used is divided into the realized production and in a such a way the value of consumption per production unit is obtained. Such a way of planning the consumption permitted a constant struggle for achieving better results than during the previous year but it lacked professionally and scientifically defined methodology of real planning. Thus similarly the monitoring of energy consumption is carried out. While monitoring electric power consumption the data used refer to periodical control of such energy consumption and a comparison with the planned quantities was accordingly made, having in most cases quite a negative effect, as the adequate interventions failed when a large consumption was in question. Somewhat less complex system of evidencing was applied when monitoring fuel consumption, particularly in case of open pits having their own pump stations. Rarely, complex factors influencing the consumption of energy and material were analyzed such as the efficient technological processes and efficient organization of labor. Since recently, consumption of energy and material at open pits in Yugoslavia has become much actual. As a leading global manufacturer of crushing and milling equipment, we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete stone crushing station. We also supply individual jaw crusher and Raymond mill as well as spare parts of them.

Certain open pit mines initiate the study of a series of mutually interlinked issues concerning technology, efficiency and organization of production, thus overpassing the accepted principle that the planning standards are only based on the previously achieved consumption standards. Defining the modem methods of monitoring energy and material consumption might be considered as the general scientific-research direction in surface exploitation for the purpose of decrease in overall costs and better productivity.

Some market competition stronger consciousness in the enterprise, the constant development of new technology, a target on the domestic high-end users and products based on the components and independent production, in export trade friction constant international situation, domestic equipment and parts will naturally and foreign competitors and suppliers according to force fight. So crusher in the future development gravity of the center in the revitalization of mechanical constantly shifting to the base technology and basic parts, in order to improve the independent research and development up manufacturing level.

The overall size of the mechanical manufacturing industry in our country has broken into international production country ranks, as our country mining machinery industry of constant exploration and innovation,the whole competition and development has been basically in the future which close to manufacture level of developed countries .

China manufacturing industry market is very wide, including chemical industry, mining, construction, water conservancy, metallurgy, coal mine, glass, and other industries. In China"s most important application fields are cement industry, mining, application and pave in this send several industry of the whole industry accounts for about the crusher of around 30%.

According to the different grinding process and the grinding characteristics of different positions, there sets a Archimedes spiral enhance lining plate and a double curved surface lifting grading lining plate with different lifting force on the high efficiency and energy saving ball mill. It sets an efficient combined compartment in tube for inner classification, which forms the unique properties of the balanced powder abrasive flow and it provide a activation loop in a fine grinding barn, which strengthen the grinding function.

It can automatic tracking the variation of the motor speed control inverter by the detecting the changing current of the motor rotor loop which is processed by the computer when the current flow through the control center. The control converter change the alternating current with a frequency of 50HZ into a same electric potential with the current frequency of asynchronous motor rotor.

It sets machinery, electronics, micro-computer control in one through the large capacity high voltage intelligent reactive power compensation of frequency control technology applying in energy saving ball grinder, which realizes the reactive power compensation of the tube mill power drag, automatic diagnosis and repair fault, realize the grinding efficiency, low power consumption by the use of the programmable intelligent.

The grinding process is high power consumption, and it is the essential department in aerated concrete equipment. The building industry promotes the development of aerated concrete industry, as well as stimulates the widely use.

Vertical mill is a large ideal grinding machine, and is widely used in cement industry, electric power, metallurgy, chemicals, and non-metallic mineral industry. It can grind coal, marble, granite, kaolin, hard coke etc. So it is also called vertical coal mill or vertical cement grinder.

When it is put into use, the materials to be grinded are put into the main frame through the feed-in bin on the side cover. Then it revolves round the vertical axis line by the milling roller hung on the star rack. With the centrifugal force by rotation, milling roller wings outside and presses fast on milling rings to make relieving tool carry materials between milling roller and ring, thus the materials are crushed by the rolling and milling of the milling roller.

Compared with ball type mill, what"s advantages of vertical coal mill ?

1. Low Investment Cost
This mill itself can crush, dry, grinding, classifying, so the system is simple, and occupation area is about 50% of ball mill system. In addition, it can be installed outside, so it will reduce a large number of investment costs.

2. Low Operation Cost
A. High efficiency: roller compacted materials directly onto the grinding disc, so power consumption is low. Compared with ball mill, it saves energy consumption by 30% ~ 40%.
B. Less wear and tear: As the roller is not in direct contact with the disc, and material of the roller and liner is high quality, so life lime is long.

3. High Drying Ability
As the hot air inside contacts directly with the material, drying ability is higher, and it saves energy. By regulating the air temperature, it can meet requirements with diffirent humidity.

4. Simple and reliable operation
A. It is equipped with automatic control systems, so remote control makes it easy to operate.
B. It is equipmented with one device,which prevents the roller from contacting with the liner directly, and avoids the destructive impact and severe vibration.

5. the stability of product quality
As the material stays in the mill for a short time, the Raymond mill is easy to detect and control the product particle size and chemical composition, to reduce duplication of milling, stable product quality.

6. Maintenance convenience
By repairing fuel tank, rotating the arm, it is fast to replace the roller sleeve, and liner, and reduce the downtime loss.

7. Environmental protection
It is with small vibration, low noise, and the overall sealing. The system works under negative pressure, so there is no dust going out. It meets the requirements of the state Environmental Protection.

We can supply any type of used ball grinders for the food, chemical, mining, pharmaceutical, sugar, oil processing, marine, waste water treatment, rendering, environmental, industry and process industries. Used, industrial and commercial mills include pebble mills, slag mills and more. Crushers and mills are used to reduce chemicals, materials or other products to a desired particle or aggregate size range.

This mill machine is the most effective Industry mills for batch-wise, rapid comminution of medium-hard to very hard samples down to the finest particle sizes. The grinding can take place dry or wet. Grinding sets of many different materials are available. The mills can also be used for mixing and homogenisation.

As a professional mill manufacturer, the industry ball grinders manufactured by Hongxing Machinery are of reliable structure, stable running, high efficiency and energy-saving. Its application is pretty wide such as the cement, silicate products, new building material, refractory material, chemical fertilizer, and chemical industry, black and non-ferrous metal beneficiation and glass-ceramic production industries. The products are used to wet grinding or dry grinding of various ores and other grind able materials.

Ball mill is used to grinding various ores and other materials, and tube ball mill is widely used in mineral processing equipment, construction and chemical industry and other national economic departments. This equipment is used to grind ore and other material with different hardness by drying method. They are the main powder grinding equipment widely served in metal ore dressing, building material industry and chemical industry. It gets its name for installing discharging grid plate at the discharging end. The equipment consists of driving part, rotating part, main bearing, feeding and discharging part, lubrication part and electric control part.

This equipment is the key equipment for re-grinding materials after the primary crushing. The application is quite wide such as cement, silicate, products, new building material, refractory material, chemical fertilizer, black and non-ferrous metal beneficiation and grass-ceramic industries. It can be used to wet grinding or dry grinding various ores and other grind able materials. According to the material and ore discharge pattern, the vertical Raymond mill equipment can be chosen as wet type grid ball mill equipment and dry type grid ball grinder equipment.

This ball mill is horizontal type and tubular running device, has two warehouses. This machine is grid type and its outside runs along gear. The material enters spirally and evenly the first warehouse of the milling machine along the input material hollow axis by input material device. In this warehouse, there is a ladder scale board or ripple scale board, and different specification steel balls are installed on the scale board, when the barrel body rotates and then produces centrifugal force, at this time , the steel ball is carried to some height and falls to make the material grinding and striking. After grinded coarsely in the first warehouse, the material then enters into the second warehouse for regrinding with the steel ball and scale board. In the end, the powder is discharged by output material board and the end products are completed.

Concrete from roads, pavements, airfield runways, buildings, and other sources can be crushed for reuse. After crushing, magnets remove the steel rebar and the resulting aggregates are screened according to planned use. The crushed concrete produces hard, granular aggregates composed of inert mineral materials including sand, gravel, and aid crushed stone.

The American Concrete Pavement Association estimates that approximately 322 kilometers of concrete pavement is being recycled each year and approximately 5.440 metric tons of crushed concrete can be reclaimed from 1.6 km of concrete pavement with an average thickness. This shows that 2.6 million metric tons of reclaimed concrete is being recycled annually in the st1:country-region w:st="on" United States.

TxDOT has specifications that allow crushed concrete to be used in flex base, cement-stabilized base, and riprap. Additionally, crushed concrete can be used as coarse aggregates in Portland Cement Concrete and as fine aggregates in asphalt stabilized base.

Recycling of Portland cement stated in Europe after World War. With time and through necessity, recycled aggregates have become increasingly acceptable as road construction. It is estimated that approximately 100 million tons of concrete nibble is generated annually in the st1:country-region w:st="on" United States. Tins amount is projected to exceed 150 million by the year 2000. Landfill life will be unnecessarily shortened if this volume of nibble is dumped there; furthermore, a valuable material will be wasted if not recycled into usable aggregate products.

IN comparison with the national annual aggregate production of more that 2 billion tons, concrete nibble represents only 5 percent of the aggregate market if it is all recycled. Since some nibble is lost during demolition and some will be disposed of in landfills, recycled concrete aggregate is probably less than 3 percent of the total aggregate market. Crushed concrete, none-the-less represents significant opportunities for economic and environmental benefits.

The Center for Transportation Research (CTR) of the University of Texas at Austin conducted a study on recycled materials for TxDOT. According to its findings, Phan district had the biggest stockpile (3.624 metric tons) of old concrete. Nine of the twenty-one TxDOT districts responded to the survey already had stockpiles of crushed concrete and nineteen districts believed that old concrete could be used as road-base material. TxDOT engineers from Abilene, Atlanta, Beaumont and Dallas districts rated the performance of concrete as excellent and professional final product manufactured by Hongxing sand maker.

Recycling of old concrete pavement has become an important issue as more concrete pavement reaches the end of its functional and structural life. Currently, economic considerations are the primary thrust for the use of recycled concrete aggregate (RCA) in Portland cement concrete (PCC) pavement. However, as landfill spaces become scarcer and more expensive, environmental considerations will play an important role as well.

The section of IH10 in Houston District between Loop 610 and IH 45 is under reconstruction. The contractor decided to use 100 % of RCA in the new pavement concrete. This project is the first one in the nation where all the aggregates used for pavement concrete crushed by impact crusher, both coarse and fine, are recycled with no virgin aggregates used. As such, there is not much information available regarding the performance of PCC pavement with 100% RCA.

By way of Analyzing and exploring the domestic and international advanced technology and combining the common problems occurring in the production process, RedStar Machinery researched and developed new type of ancillary equipment such as energy-saving Raymond grinders, crushers and vibrating sieves and many of such machines are applied into chemical industry, building materials, metallurgy, mining and other industries, and they form a special characteristic in the country"s mining machinery products market and commit to the development of overseas market.

Material crushing is an indispensable link in the chemical industry, mining and cement and other industrial production, and generally speaking, the granularity and processing capacity of the mill is a contradiction that is difficult to coordinate because high fineness will certainly have an influence on the production capacity of the mill. In order to solve this problem, Hongxing mining machinery regard the research on mill fineness and high yield as an important object of studying. At the same time, analyze and study the high-end technology that is introduced from other countries. In addition, according to the industrial environment and market development, develop hanging Raymond mill with competitive advantages, and this kind of product not only has fine degree but the production was subsequently heightened which successfully solves the uncoordinated problems exiting in the ordinary grinding machine.

We adhere to strict scientific ideas, not only make great breakthroughs in technology, but strive for perfection in the manufacturing process. We set checkpoints in every link from raw materials to finished products in order to maker sure the stability reliability of the product quality. In the raw material aspect, all adopt high quality steel products, forgings select famous high-tech forging plant products, which adds quality insurance for the products from the source; as for the technology, we actively absorb domestic and foreign advanced technology and use it for ourselves, work to make professional model in this industry with science and technology so that the product quality and content of science and technology can be continuously improved, with the high-tech science and technology content we add a second quality insurance for the ore beneficiation products; Quality control, the company has a set of strict quality testing procedures equipment, each set of products is inspected over and over again before they leave the factory so as to add the third quality insurance. The three quality insurances effectively ensure the product quality, making the vulnerable parts not easy to be damaged and fundamentally extending the life of the equipment, thus we set a good public praise for the company with rigorous attitude of scientific research and sincere service attitude.

In today"s industry field of mining machinery, grinding machine is the most widely used equipment as for the miners. If you want to get some benefits from the industry field of mining machinery, you should have some basic but useful knowledge about this series machines. The grinding machine consists of a power driven grinding wheel spinning at the required speed (which is determined by the wheel’s diameter and manufacturer"s rating, usually by a formula) and a bed with a fixture to guide and hold the work-piece. The grinding head can be controlled to travel across a fixed work piece or the work piece can be moved whilst the grind head stays in a fixed position. Very fine control of the grinding head or table position is possible using a venire calibrated hand wheel, or using the features of numerical controls.

With the rapid development of the Chinese economy, the equipment of grinding machine will certainly play a vital role in its project territory. Today"s grinding machine of mining equipment industry has walked through the extensive development moment that relied on the cheap labor advantage and the expense of the environment. Conforming to the trends of low-carbon economy, the grinding machine industry is positively exploring the energy conservation and environment protection development path.

Grinding machine is kind of mining machinery equipment that may be used versatile, expedient and maneuverable, especially Hongxing Machinery’s ball mill machines, they always bring you the optimized characteristics.

In recent years, the grinding machine industry has got a rapid development. During this period, the industry of mining machinery has also so many elite companies came to the fore. There have been many new products and new equipment appeared in the market and showing the strong vitality. Henan Hongxing Mining Machinery Co., Ltd is a professional company which produces the mining equipment. The grinding machines our company produces mainly consists of Medium Speed Trapezium Mill, MTW continental trapezoid mill, SCM Super-micro Mill, Efficient crushing-type mills, Reinforced ultrafine mill, LM series vertical grinding mill and Raymond Mill. They all have the optimized structure, excellent performance, long tool life and easy tool changing. They are always vigorous. Since the establishment of the company, he always being at the forefront of the mill technology and even pushing the Chinese mill technology to the leading stage of the world.

Our company has independent import-export right with a special international market department to deal with exporting affair. We have a professional after-sale service faculty to provide considerate and all-around-way service for the customers. Advanced technology content, high reliability, low operation and maintenance cost have enabled our products to take the leading position in the field. Our products have been exported to more than 130 countries and are widely used in global mining and construction industry. Being innovative and perfect is our incessant pursuit, and also our vigor source of energy and harmony. We will continuously create better products and better services, and always bring more value for our customers.

Market demand is the drive and basis of our endless innovation. Rich technical experience and the application of high technology make our products rank a leading place in the industry in technology content, performance, reliability and maintenance cost, etc. We expect your choice and prepare to provide you with heartfelt service at any time.

The vertical mill is a kind of mill equipment which is widely used in cement chemicals, coal, electricity and other fields. With the advantages of small footprint, low power consumption, small noise, simple process, layout compact, combined with crushing, drying, grinding, classifying as a whole, it has become the preferred equipment for milling cement raw meal in the modern cement production factories.

The world"s first vertical mill was developed by Loesche Company from Germany, who had the mature design already in the year of 1925. At present, the largest one - LM63．4, has a capacity of 840 TPH, with the millstone diameter of 6.3mm, the power of 5600 KW and is equipped with 4 rollers.

The current abroad manufacturers mainly include Loesehe Company, Fuller Company, UBE Company, FLS Company (Atox Mill), KHD Company (RM mill) and Pfeiffer Company. The domestic manufacturers have a relatively small amount, whose R&D and production are still in the developing level. However, compared with international brands, the domestic brands have some unique characteristics, which are better suited to the domestic market.

Compared with other grinding equipment, this machine has the following features.

1. High efficiency of grinding. Using the principle of material bed’s crushing and squeezing, the material is rolled, cut, impacted in the mills; the airflow in the mill can take the grinded materials out timely to avoid excessively grinded; the materials generally stay in the mill for 2-4 minutes. It has the 165% grinding efficiency as the ball mill and the power consumption can be reduced by 30% or so.

2. High drying efficiency. Hot air spray in from the annular gap with high wind speed; there is a large ventilation cross-section in the mill and the air resistance is very small. The materials with 8% moisture can be dried by the exhaust gas from preheater in the end of kiln. If there is a hot air furnace, the materials with 15%-20% water content will be dried. So it has many advantages over dryer machine.

3. The feeding size can be very large and usually can be up to the length as 5% of the roller diameter. The large ball mill’s feeding size can be up to 150 ~ 200 mm. The equipment has superior technical performance and is of high capacity. It has high rate of operation and lower metal-worn than the ball mill.

4. Strong adaptability to grinded materials. It can be used to grind a variety of materials, such as limestone, sandstones (Si02 90%), coals, cement clinkers, blast furnace slags and so on. No matter the differences of raw material’s easy-grinding or abrasive, the equipment can produce qualified products with different fineness and different specific surfaces just by adjusting the internal structure and operating properly.

5. Simple process and compact layout, lower routine maintenance cost. It can be used as open-air setting and can save 70% construction investment than the ball mill.