What is the process flow of coal washing plant? What equipment is needed for coal washing?

What does a coal washing plant do?

Coal washing: In order to remove the gangue in the coal, in order to prevent it from melting and agglomerating during high-temperature combustion, it is easy to block the furnace or other combustion facilities, and it does not burn to reduce the heat of combustion and affect the efficiency. The inferior coal is washed away to obtain clean coal.

What Coal Washing Machine is needed for coal washing?

Gravity separation equipment includes: heavy medium separator, heavy medium cyclone

Flotation equipment includes: flotation machine, flotation column, flotation bed, pulp preprocessor

Dehydration equipment includes: centrifuge, pressure filter, filter press, media removal screen

Others: magnetic separator, air dryer, air compressor, pump, curved screen, belt, scraper machine, classifying cyclone, TBS, disturbing bed, spiral separator, jig

In fact, it is related to the process flow, for example: xx tons of raw coal is selected annually, and the technical process is that after desliming of 50-0mm raw coal, it is sorted by a dense medium cyclone without three products, the coarse coal slime is sorted by TBS, and the fine coal is sorted. Combined washing process of coal slime flotation and tailing coal thickening and pressure filtration. Its main equipment is: non-pressurized three-product dense medium cyclone, flotation machine, clean coal separation screen, magnetic separator, pressurized filter, quick-opening diaphragm press, thickener, etc.

What is the process flow of coal washing plant?

Coal processing, gangue treatment, material and equipment transportation constitute the mine surface system. Among them, the ground coal processing system consists of coal receiving, screening, crushing, beautification, storage, loading and other main links. It is the main body of mine surface production.

Coal receiving means that there is a coal bunker with a certain capacity near the wellhead to receive the coal lifted from the underground to the ground to ensure balanced and continuous production from the top to the bottom of the wellhead.

to sieve

The operation of dividing the mixture of different particle sizes into various particle poles with a screen surface with holes is called screening. The machine used for drying is called a sieving machine or a sieve.

In coal preparation plants, screening operations are widely used for raw coal preparation and processing. According to different sieving methods, it can be divided into dry sieving and wet sieving.

broken

The process of crushing large pieces of material into small particles is called crushing. The machine used for crushing is called a crusher. The crushing operation in the coal preparation plant mainly has the following requirements:

1) Adapt to the requirements of the selected particles; the coal particles that the selection machine can handle have a certain range, and the large pieces that exceed this range must be crushed before washing.

2) Some coals are mixed with gangue. In order to select clean coal, it needs to be broken into smaller particles to separate coal and gangue.

3) Satisfy the user's particle requirements, and quickly crush the selected product or coal to a certain particle size

Materials are mainly crushed by mechanical methods, including crushing, chopping, breaking, crushing, and grinding.

coal preparation

It is to use different physical and physical-chemical properties from other substances to mechanically remove the impurities mixed in the raw coal in the coal preparation plant, and divide it into products of different quality and specifications to meet the needs of different households.

According to the location of the coal preparation plant and the closeness of the coal mine, the coal preparation plant can be divided into: mine coal preparation plant, group mine coal preparation plant, central coal preparation plant and user coal preparation plant; most of the existing coal preparation plants in my country are mine coal preparation plants. A modern coal washing plant is a continuous mechanical process consisting of many operations.

Jig coal preparation

The coal preparation process is carried out according to the particle density difference in the vertically pulsating medium. The medium of jigging coal preparation is water or air, and some suspensions are also used. Hydraulic jigging is the most used in coal preparation.

The jig machine is a device that uses the principle of jigging to separate the selected raw materials into clean coal, medium coal, gangue and other products according to their density.

Dense medium coal preparation

In a medium with a density greater than 1g/cm, coal preparation is carried out according to the size difference of particle density, which is called dense medium coal preparation or dense medium coal preparation. There are two types of heavy medium used in coal preparation: heavy liquid and gravity separation floating liquid. The main advantage of dense medium coal preparation is the high separation efficiency compared with other coal preparation methods; the selection range is wide, the feed size of the separator is 1000-6mm, and the cyclone is 80-0.15mm, and the production control is easy to automate. The disadvantages of dense medium coal preparation are complex production process, high production cost, fast equipment wear and heavy maintenance.

Dense medium coal preparation is generally selected by classification. Separation of lump coal is generally carried out with a heavy medium separator under the action of gravity; separation of fine coal is carried out with a heavy medium cyclone under the action of centrifugal force.

storage

Coal storage bunker: A coal bunker with a certain capacity is set up to adjust the imbalance between production, transportation and sales, and ensure the normal and balanced production of mines and transportation departments. loading stage.