Coal preparations goal is to remove or reduce impurities in raw coal (including ash, waste rock, sulfur, etc.) and the treated coal is divided into several different varieties of grades to meet the needs of users.

Coal preparation serves several purposes. One important purpose is to increase the heating value of the coal by mechanical removal of impurities. This is often required in order to find a market for the product. Run-of-mine coal from a modern mine may incorporate as much as 60 percent reject materials. Air pollution control often requires partial removal of pyrites with the ash to reduce the sulfur content of the coal. Ash content often must be controlled to conform to a prescribed quality stipulated in contractual agreements. Because of firing characteristics, it is often as important to retain the ash content at a given level as it is to reduce it.

Freight savings are substantial when impurities are removed prior to loading. Finally, the rejected impurities are more easily disposed of at the mine site remote from cities than at the burning site, which is usually in a populated area.

Technology of Coal Preparation Processing

Coal preparation according to different methods can be divided into physical preparation, physical and chemical preparation, chemical and microbial preparation and other coal preparation.

Physical coal preparation is under the physical properties of coal and impurities (such as particle size, density, hardness, magnetic and electrical properties, etc.) on the difference of separation, the main methods of physical separation:

Preparation of gravity, including jigs, heavy-medium coal preparation, coal preparation chute, shaking preparation, such as wind preparation.
Electromagnetic election, using the electromagnetic properties of coal and impurities separation differences, this method is not in the actual production application of coal.

Chemical coal preparation takes advantage of chemical reaction to make a useful component of coal enrichment, remove impurities and harmful elements process. Currently used in the laboratory method is chemical desulfurization. According to commonly used chemical reaction mechanism of different types and can be divided into alkali treatment, oxidation and solvent extraction.

Microbial coal preparation is making use of some microbial autotrophic and heterotrophic microorganisms, directly or indirectly, to use its metabolites in the leaching of sulfur from coal to achieve the purpose of desulfurization.

Clean Coal Processing

Clean coal technology is a series of newly developed coal processing, conversion and combustion of soot in the flue gas channel of the general purification technology. Aim is to reduce the pollution of coal burning on the environment, improve coal utilization efficiency, and lower costs.
Clean coal technologies can be divided into three categories. Before burning through coal preparation or admixture of other substances to improve combustion efficiency and pollutant removal; combustion, combustion and the nature of change in the combustion process to remove contaminants; combustion, flue gas decontamination.

Moulded Coal Processing

Using low-grade coal or pulverized coal to make a certain shape made of coal products are called moulded coal. Moulded coal can be divided into two types of civil and industrial use, the former including coal ball and honeycomb, the latter including for industrial boilers, kilns, and for the vaporization of steam coal, iron smelting and casting coke.

Burning coal in common includes anthracite, bituminous, cannel coal, peat, numerous other sub and so on. Burning coal can improve the thermal efficiency of coal combustion, save coal and reduce pollution. Such as my subject of the national coal briquette, if accompanied by advanced stoves, more efficient than burning coal for heat twice, save 20% ~ 30% of coal, the emission of various harmful substances reduced by 40% to 80%. Briquette energy saving rate is the highest among all the clean coal technology relative environmental benefits are high.

Coal mill also called coal pulverzier or coal grinder is that grinding mill used in coal mining industry and thermal power plant, such as ball mill,vertical coal mill. General ball grinding mill is the first coal milling machine, after grinding in the ball grinding mill, it then into ultrafine mill. In this process, we use vertical mill or ultrafine grinding mill. When it is suitable for your need, collect coal powder for further processing. Continue reading →

Coal crushing plant mainly includes many coal equipments. Depending on the characteristics of coal, many stone crushers can be used in coal crushing plant.

Jaw crusher is the most commonly used coal crusher machine in coal handling process. According to our experience, we know that jaw crusher is applied for the content of large waste rock hard or brown coal of the broken iron.

Impact crusher crushes materials with impact force. Large coal enterprises attach much importance to crushers capacity, quality, maintenance and the cost-effectiveness in the long term. So impact crusher is the ideal coal crusher.

Mobile crusher can be used in the coal processing plant. SBM crawler type mobile crusher minimizes the equipment downtime and integrates the coal conveying and crushing, thus greatly reduces the use cost. It is favored by large coal enterprises, especially coal mine, as it meets their requirements for high capacity and efficiency processing of the coal.

Which coal crusher are used in the coal crushing plant depending on the physical and mechanical properties of materials, particle size and the requirements of broken than to decide.

Coal crusher machine application in coal processing company

Meet the requirements of coal particle size selected. Featured the coal machine can handle a certain size range, over the range of large to go through a break before washing.

Some coal is a mixture of coal and waste rock symbiotic parting of coal, in order to choose the coal that needs to be broken into smaller particle size, separation of coal and waste rock. The most common case is to be elected in the primary election machine coal crushed to 13mm or 6mm following, and then sent to re-elect re-election machine.

Size to meet user requirements, the products or coal broken after the election to a certain size. According to the product size broken, broken job can be divided into coarse pieces (the crushing to 50mm and above), in pieces (broken into 25-6mm), small and fragmented (broken into 6-1mm), crushed (1mm or less).

Coal crushing can be divided into two categories according to their position in the production system such as crushing preparations and finally crushing. Crushing preparations work for the next operational requirements of the particle size for crushing operations; finally broken coal is broken to the required size of the operation of commercial coal. Coal crushing commonly used mechanical method. In a variety of crushing machines of coal, we often dominated by a kind of broken way, accompanied by other fragmentation methods.

There are two coal crushing operation systems: open systems and closed-circuit crushing system. Open crushing system is used on the product’s size is not strictly required, or crushed when the situation does not produce too large, while closed-circuit crushing system called loop crushed system, broken product for less than the specified size must be strictly guaranteed, while the crusher machine itself cannot meet this requirement of the situation. Crushed in the closed-loop system, the crushed product to check through the screen, screen then return to the coal crusher, until through the screen so far.

Artificial Sand making Production Line

Artificial Sand & Natural Sand

Sand is widely used in highway construction, concrete making, etc. As the field of industry application gradually expanded, the gradual application of natural sand work more and failed to keep pace with the various sectors of modern world development needs. For the most part, Artificial sand is produced to meet the great needs. More advanced and high-efficiency sand making machines have been invented to push forward human civilization. Here you can learn more about definition of machine-made sand and its wide applications. Continue reading →

Aggregate production line produce construction building aggregates widely used for making concrete production. Crushed stone aggregate is produced from many natural deposits including: limestone, granite, trap rock and other durable mineral resources.
Aggregate production line manufactured by SBM Machinery aims for producing crushed stone aggregate. The aggregate process consists by progressive stages of crushing, screening, and washing. Continue reading →

Crushing machine for concrete recycling:

We can use stone crusher plant to crush concrete waste and rubbles into useful concrete raw materials. In this concrete recycling process, several types of stone crushers are used.

Jaw crusher is mainly used to proceed the medium particles crushing of various ores and large size materials with the crushing pressure of less than 320Mpa. It is a kind of excellent mine crushing machine and can crush materials with various size to small pieces. The jaw crusher can be used with the mining and sand-making equipment, and can also independently be used. Continue reading →

Concrete grinding equipment

Concrete is the raw material for construction, especially highway building. Making concrete need cement, aggregate, and water. SBM is a manufacturer of crushers and grinding machines in China, and provide ball mill, vertival mill, raymond mill, trapezium mill for your concrete or cement making industry. Continue reading →