Process for selecting cleaned coals from gangue coals of raw coals and middling coals

Abstract

The invention relates to a process for selecting cleaned coals from gangue coals of raw coals and middling coals, which adopts a method of desliming before selection and performing separation in a coal-slime separator after crushing. The process can select the cleaned coals from the gangue coals in the raw coals and the middling coals generated from coking coals after being cleaned, has the advantages of simple process, low coal dressing cost and high efficiency, is free from using flotation reagents, recycles water resources and is free from causing pollution to the environment, and the produced cleaned coals are applied to formcoke coal blending or export sales, and the middling coals and coal slimes are used as raw materials for producing moulded coals and biomass moulded coals.

Description

technical field [0001] The invention relates to a coal preparation process, in particular to a process for selecting clean coal after crushing raw coal and middling gangue. Background technique [0002] The fat coal, main coking coal, and lean coal contained in the coking coal are all scarce coal types in Heilongjiang Province. Basically all the coking coal is washed, the clean coal is used for coking, and the medium coal is directly sold to the power plant as fuel. For example, the coking coal used in Heilongjiang Province is 16.86 million tons, of which 30% or about 5 million tons are used in power plants. These medium coals contain gangue coal with a particle size of less than 50mm. If it is crushed to a particle size of less than 5mm, it contains About 30% of clean coal, 1.5 million tons of clean coal is included in the 5 million tons of medium coal distributed to power plants in a year, and these 5 million tons of medium coal are directly sold to power plants as fuel, r...

AI Technical Summary

Problems solved by technology

[0002] The fat coal, main coking coal, and lean coal contained in the coking coal are all scarce coal types in Heilongjiang Province. Basically all the coking coal is washed, the clean coal is used for coking, and the medium coal is directly sold to the power plant as fuel. For example, the coking coal used in Heilongjiang Province is 16.86 million tons, of which 30% or about 5 million tons are used in power plants. These medium coals contain gangue coal with a particle size of less than 50mm. If it is crushed to a particle size of less than 5mm, it contains About 30% of clean coal, 1.5 million tons of clean coal is included in the 5 million tons of medium coal distributed to power plants in a year, and these 5 million tons of medium coal are directly sold to power plants as fuel, resulting in a great waste of resources. , all kinds of raw coal also contain a large amount of gangue, and directly using it as fuel will also cause waste of resources. The existing clean coal preparation process cannot be widely implemented due to high coal preparation cost, low efficiency, and environmental pollution. Forming process of cleaning clean coal from middling coal and gangue mixed with raw coal

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