Method for producing fine coal, pyrite concentrate and building sand by using high-sulfur coal refuses

Abstract

The invention discloses a method for producing fine coal, pyrite concentrate and building sand by using high-sulfur coal refuses. The method comprises the following steps: taking coal refuses; after crushing the coal refuses, adding water into the crushed coal refuses till the mass percent of the coal refuses is 20-40%; sending the mixture into an adjusting groove; adding No.2 flotation agent oiland paraffin into the adjusting groove, and then mixing and stirring, thereby acquiring a slurry; preparing the fine coal by floating and separating the slurry; preparing the pyrite concentrate by reselecting and separating sulfur-containing moisture tail sands under the action of waterpower; and preparing the building sand by reselecting and separating the moisture tail sands under the action ofwaterpower. By using the method, the waste high-sulfur coal refuses are efficiently utilized and are converted into beneficial industrial raw materials without regeneration pollution, thereby being beneficial to environmental protection. The method has the advantages that the preparation process is simply, conveniently and easily operated, the industrial production is easily realized, the practicability is high, and the economic benefit and environmental benefit are significant.

Description

technical field [0001] The invention belongs to the treatment of natural stones, and relates to a method for producing clean coal, sulfur concentrate sand and construction sand by using high-sulfur coal gangue. It is suitable for producing clean coal, sulfur concentrate sand and construction sand from high-sulfur coal gangue. Background technique [0002] High-sulfur coal gangue is the secondary waste in the production of high-sulfur coal enterprises. Generally, it contains 20-30% coal and 2-6% sulfur. According to relevant data, only the waste of high-sulfur coal gangue in the coal mines under the jurisdiction of the Mining Bureau of Chongqing City increases by one million tons every year. Coal gangue with a sulfur content of 1% can spontaneously combust in a natural state, and coal gangue with a sulfur content of more than 3% can completely spontaneously combust. Sulfur dioxide produced by spontaneous combustion forms acid rain, which seriously affects the ecology and po...

AI Technical Summary

Problems solved by technology

For gangue power generation, due to the increase in environmental protection, power plants burning high-sulfur coal gangue must use calcium oxide as a conversion agent to absorb sulfur dioxide emitted during gangue combustion; however, the price of calcium oxide has risen from tens of yuan per ton in the past to about 400 yuan per ton, if 100 to 150 kilograms of calcium oxide is added to one ton of coal gangue containing 4% sulfur, the value of calcium oxide is far greater than the value of coal gangue; and calcium oxide and The reaction of sulfur dioxide is an endothermic reaction, which will greatly reduce the calorific value generated by the reaction of coal gangue, or even extinguish the furnace; therefore, high-sulfur coal gangue has been completely eliminated as a fuel for power generation

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