People have used sand and stone for foundations for thousands of years. Significant refinement of the production and use of aggregate occurred during the Roman Empire, which used aggregate to build its vast network of roads and aqueducts. The invention of concrete, which was essential to architecture utilizing arches, created an immediate, permanent demand for construction aggregates.

Construction aggregate, or simply “aggregate”, is a broad category of coarse particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined material in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete; the aggregate serves as reinforcement to add strength to the overall composite material. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and road side edge drains. Aggregates are also used as base material under foundations, roads, and railroads. In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties (for example, to help prevent differential settling under the road or building), or as a low-cost extender that binds with more expensive cement or asphalt to form concrete.

There is an exhaustive listing of specifications for various construction aggregate products, which, by their individual design, are suitable for specific construction purposes. These products include specific types of coarse and fine aggregate designed for such uses as additives to asphalt and concrete mixes, as well as other construction uses. State transportation departments further refine aggregate material specifications in order to tailor aggregate use to the needs and available supply in their particular locations. Sources for these basic materials can be grouped into three main areas: Mining of mineral aggregate deposits, including sand, gravel, and stone; use of waste slag from the manufacture of iron and steel; and recycling of concrete, which is itself chiefly manufactured from mineral aggregates. In addition, there are some (minor) materials that are used as specialty lightweight aggregates: clay, pumice, perlite, and vermiculite.

Recycled aggregate is defined as aggregate resulting from the processing of inorganic material previously used in construction. To ensure the aggregate is inert, it is manufactured from material tested and characterized under European Waste Codes. 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.

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For such a lowly industrial mineral, gypsum is extremely versatile. What else was used in the pyramids and toothpaste, helps peanuts and mushrooms grow, and is the key ingredient in movie snow and the walls of your house. The ancient Assyrians called the rock alabaster, and used it for sculpturing. Five thousand years ago the Egyptians learned to make plaster from gypsum and lined the walls of their palaces, and their tombs with it (some of this earliest gypsum plaster has been found inside the great Pyramids). It was the ancient Greeks who named this mineral “Gypsos,” from which we have derived the name Gypsum. There is another form of gypsum which is clear and transparent, in layers like mica. This was used, many centuries before glass was invented, as windows in the old temples. The Greeks named it after their Moon Goddess, “Selene”, and today we still call it “Selenite”.

Over the centuries, gypsum has found many uses. It is used to control hardening in Portland Cement. Car windows are made of plate glass which is held in a bed of gypsum during the polishing process. Small metal gears are cast in gypsum molds by a process that was largely perfected during World War II. In medicine, a dentist uses a gypsum dental plaster mold in which to cast a bridge and doctor uses gypsum to build splints for broken limbs from a gauze impregnated with orthopedic plaster. Even Benjamin Franklin used ground raw gypsum as a soil conditioner, called land plaster, on his farm.

One of gypsum’s greatest features is that it is relatively fireproof. Chemically, gypsum rock is calcium sulfate with two molecules of water which is released when exposed to intense heat. When a wall or ceiling coated with gypsum lath or plaster is exposed fire, the heat soon exceeds the boiling temperature of water – 212 F. However, at that temperature the water in the gypsum starts to vaporize and becomes steam. This absorbs the surrounding heat energy and keeps the drywall no hotter than 212 F. Until all the crystallized water has been driven off, the gypsum will protect the wooden framework of the structure, or whatever flammable materials the gypsum may be covering. Of course this protection lasts for only a limited time, depending upon the thickness of the gypsum, which is being destroyed as the fire continues. However, the fire-retarding action of the gypsum may cause the fire to burn out with minimal damage to the building or provide time for firefighters or people in the building. National Gypsum mines and quarries gypsum rock, crushes and grinds it, and calcines it to remove chemically bound water. It adds starch and other additives and water to form a stucco slurry. The stucco is sandwiched between two sheets of paper and hardens, forming gypsum board. Since water content is critical to its ability to retard fires, quality control is critical in terms of measuring water content and even kiln temperatures.

Ironically, it may be another mined mineral, coal, which may be the future source of gypsum. The newest gypsum plants use solid waste byproduct gypsum produced when coal-fired power plants scrub their emissions to remove sulfur dioxide. The byproduct of this operation is calcium sulfate.  With its high quality products such as sand maker, ball mill, Hongxing Machinery has ascended in the front rank of the world in the exporting of mining equipment.

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As we all know that it is a piece of common knowledge that we will often fit out screen machine in the stone manufacturing and production line. This screening equipment is a vibrating and screening machine device which is suitable for dry screening the kind of material that has a high degree of water content and that is different to sieve it well.

This kind of machine manufactured by Honging Machinery earns this name by reason of its approximately circular movement. It is of multilayer and high efficient. The eccentric shaft vibration exciter and partial block help to adjust amplitude. This kind of screening equipment is of long streamline, clear screening for different specifications. It is widely used for grading and screening materials in the fields such as coal-selecting, mining-selecting, building materials, electrical power and chemical industry, etc. The vibrating equipment is used to separate materials. It is composed of main frame, screen, motor, eccentric bock, rubber spring, coupler and etc. Our company supplies suitable type according to customers’ demands. The features are as follows: simple, reliable, high screening capacity and high durability.

Vibrating screen moves round. It has multi-layers and is of high efficiency. The eccentric shaft vibration exciter and partial block help to adjust amplitude. The material drops down along the long line. In screen grading, the material is separated mechanically on screen plates. Rolling bearings in vibrating screens are stressed by high, mostly shock-type loads. Moreover, the bearings, while rotating about their own axis, perform a circular, elliptical or linear vibrating motion. This results in high radial accelerations which additionally stress the bearings, and especially the cages, considerably. The operating speeds are usually very high. As a result, the bearing temperatures are up to 20 to 30 degrees Kelvin higher than in normal applications. In addition, considerable misalignments between the bearing locations and considerable shaft deflections have to be accommodated.

If it cannot be started in a normal way, then the customer should immediately stop the equipment and make a comprehensive check and examination. If the causing reasons are not within the following points, then you may consult the relative personnel, and our engineers and technicians will timely answer your questions or get to the working spot to clear and solve your problems. And the following abnormal start is concluded by the technicians in Hongxing Machinery according to the customers’ demands and we hope that these solutions can make you feel relieved if the same or related problems happen to your machines.

(1) The needed electric voltage for the vibrating screen is 380v so please make sure that you are using three boxes of power.

(2) If the motor is damaged, please change it in time.

(3) If the machine component that is used for controlling the circuit is damaged, please change it.

(4) When the electric voltage is not sufficient, the customer can solve the problem by changing the power supply.

(5) When there is a lot of material on the screen surface, please clean it.

(6) If the exciter breaks down, please examine and repair the exciter.

(7) When the lubricating grease becomes thick and packed, the exciter should be cleaned and need to replace suitable lubrication grease.

Dry magnetic separating equipment is commonly used iron and manganese equipment, mainstream intensity of mineral processing equipment. This machine used for dry magnetic separation of magnetic minerals beneficiation machinery, as opposed to wet one to use when sorting mineral liquid as a diluent to improve separation efficiency, the equipment is required to be separation of the mineral drying, particles can move freely, into independent free state, otherwise it will affect the magnetic effect, or even result in non-separation of the consequences. Dry magnetic separating machine is used for particle size below 3mm magnetite, pyrrhotite, roasted ore, limonite and other materials, wet magnetic separation, but also for coal, non-metallic minerals, building materials and other materials in addition to iron work.

Germany Coal washer is an important washing machine in coal washing process. We know, when the raw coals are mined from underground, they need to pass some coal working procedure so that coal can be used in our modern life. Coal washing is an essential pre-process of coal cooking. Coal can divide into raw coal and clean coal. Raw coal is generally used as fuel for energy, clean coal or fine coal is used for coal cooking. Clean coal should be washed with water to sulfur, to impurities and other industrial processes, in order to achieve the criteria used coke. Germany Clean coal needs to be washed with water to sulfur, to impurities along with other industrial processes; to have the criteria used coke. So, coal washer also known as coal washing machine plays a crucial role within this coal processing. Clean coal ought to be washed with water to sulfur, to impurities along with other industrial processes, to have the standards used coke.

How is the washer machine is installed and debugged?

1. Motor should outfit rain shelter to protect equipment from creep age.

2. Sand washer ought to be installed on the rear of vibrating screen. The rotary direction must strictly according to the requirement.

3. Check every connective bolt has been fastened before trial run.

4. Check every movable part continues to be lubricated ahead of when trial run.

5. Drive belt pulley run by man before trial run. Make sure there are not any blocks along the way of working, then user can transport on blank test. During two hours there aren’t any striking, pulley swinging and bearing loosen occur as well as the bearing temperature rise cannot exceed 35 centigrade. In the event the above trouble occurs, please stop machine immediately and check it.

6. The machine needs to be installed on the reinforced concrete. Beside this, machine users have to develop a concrete sedimentation basin to handle the waste water. The waste water can be reused after precipitation. These techniques not just meet the environmental requirement but additionally reduce the sand’s cost.

7. Because this machine’s working place and conductor materials are contacted with water, so users must ensure the lead is insulated.

In your whole life especially when you are young, you must be dying to know which is the most suitable dryer when you want to start a mining business. Because a reasonable selection of drying plant can save investment, reduce running cost to ensure product quality, get the maximum economic benefit. The ideal selection must be according to user"s conditions and material"s factor, having the stress to find the most suitable model for you materials.

Coal slime dryer equipment mainly consists of draft fan, scattered, belt device feeder, feeding machine, rotary roller, heat source, belt discharging machine, unloaded feeder and distribution ark to form.The work area consists of guide material area, lift up the stripper plate area, the material discharging area and clean up area.

The refractories is the key factor to extend the service life, the use length of refractories directly affect the rotary dryer"s availability.If frequently stop refractory kiln lining, it not only increased overhaul strength, but also affect its normal operation, increasing manufacturing cost, bringing huge economic losses. The service life of the refractory materials mainly depends on the operation status, the corresponding process, as well as refractory material selection, the right building method. Properly laying refractory materials will be the key to the service life, not only be helpful to prolong service life, still can eliminate this should lead to premature damage to some of the stress; The wrong laying method can greatly shorten the refractory materials using life.

Wet coal is already low moisture loose state and don"t have the binding phenomenon in this area.After heat transfer, coal slime reach the demand water moisture, then goes to the next material area. Wet coal slime in cleaning area is copy plate start to copy form curtain material condition.Material falls easily formed wall binding phenomenon. In the cleaning up area, for mechanical design having cleaning device, cleaning device reasonably cleans material adhesion on the wall. In the process, cleaning device also plays materials group ball agglomerate crushing effect, which increases the heat transfer area, improves drying rate

In the construction site inspection, we often find the anchor is not firmly welded, sometimes even appear off phenomenon with a feet touch, if that is not handled in time, it will appear that large area pouring materials chunks in the production. It can cause accidents. In the process of daily work, we should be strictly to the rotary dryer reviews, solve the problems in time, increase production efficiency, bring benefit to the company, as well as increase safety insurance.