A Simplified Separation Process for Full-grade Anthracite Selection

Abstract

A whole-level simplified separation process for anthracite, which adopts dry screening with large sieve holes, pre-discharging gangue by non-dense medium separation process for lump coal, and a set of low-density control system for dense medium process. The specific operation steps are: The raw coal is pre-screened with a grading sieve, and the gangue discharge and separation process system is used to discharge the lump coal, and the three-product dense medium cyclone is used for separation: the clean coal and medium coal are used as a product alone or mixed as a clean coal product, and enter the degassing process. Qualified products are obtained after mediation and dehydration equipment; media circulation, recycling, and additional media are carried out after the product is removed from media and dehydrated. Then the coal slime is concentrated and classified, and the fine coal slime is recovered. This sorting process system is simple, high sorting efficiency, flexible product structure, low production and operation costs, easy to maximize the yield of clean coal, and reduce infrastructure investment. A highly efficient anthracite full-grade selection simplified sorting process to adapt to construction Efficient and integrated to meet the needs of coal preparation plants for anthracite separation.

Description

technical field [0001] The invention relates to a raw coal separation process technology, in particular to a simplified separation process for full-stage selection of anthracite with high water content, wet and sticky raw coal, large amount of fine coal, high gangue content, easy muddying and difficult separation of gangue. Background technique [0002] Anthracite is the coal with the highest degree of coalification. It has the characteristics of low volatile matter, high fixed carbon, and high density. The relative density of pure coal can reach up to 1.90kg / m 3 , Anthracite is widely used, mainly used in chemical industry, power generation, metallurgy, civil and other industries. In recent years, the products of anthracite coal preparation plants have been continuously developed and applied. For example, lump clean coal with good thermal stability is a good raw material for ammonia synthesis. Anthracite with low ash, low sulfur and good grindability is not only widely used...

AI Technical Summary

Problems solved by technology

The process system consists of two sets of dense medium separation systems. It needs to be equipped with two sets of density control systems and two suspensions with different densities. The process system is relatively complicated. Anthracite is the coal with the highest degree of coalification because of its high coal density. , when sorting and discharging pure gangue, the density of the suspension needs to reach 1.90-2.20g / cm 3 , it is difficult to configure a stable high-density suspension, and in the actual production process, the traditional dense medium separation process will inevitably bring some coal slime and water into the separation tank, which not only reduces the separation Density selection, and at the same time, the viscosity of the suspension was increased due to the introduction of coal slime, which eventually caused a serious loss of clean coal products

For the separation of fine-coal two-product dense medium cyclone, due to the large proportion of the suspension, it causes serious wear and tear on equipment and pipelines. Due to the complexity of the separation system, the construction cost of the coal preparation plant is also greatly increased.

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