Comprehensive utilization method of pyrite concentrate and high-sulfur coal

Abstract

The invention discloses a comprehensive utilization method of pyrite concentrate and high-sulfur coal. With pyrite concentrate as a raw material, the method comprises the following steps: extracting sulfur from pyrite concentrate by a thermal distillation process to prepare sulfur S; further desulfurizing the slag after the sulfur extraction by a boiling process to obtain SO2 gas; preparing sulfuric acid from the SO2 gas; and finally, with the desulfurized slag and high-sulfur coal as raw materials and in the presence of flux, sintering to obtain a sintered iron ball. The method turns waste into wealth and realizes mass-energy balance with the most economical technology and has a broad application prospect.

Description

technical field [0001] The invention relates to a treatment method for industrial waste, in particular to a comprehensive utilization method for sulfur fine sand and high-sulfur coal, which belongs to the technical field of environmental protection. Background technique [0002] With the rapid development of non-ferrous smelting in my country, the mining volume of non-ferrous metal copper, aluminum, zinc and other ores is increasing, and the accumulation of tailings after ore dressing is also increasing, which not only occupies land, but also pollutes the environment. Tailings contain iron disulfide (FeS 2 ), commonly known as sulfur concentrate, is the raw material for sulfur and iron smelting after re-election. However, non-ferrous metal smelting enterprises only pay attention to the acquisition of target metals, and discard the tailings, resulting in waste of resources. [0003] High-sulfur coal refers to coal with a sulfur content > 3%. my country’s coal resources r...

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Problems solved by technology

However, non-ferrous metal smelting enterprises only pay attention to the acquisition of target metals, and discard the tailings, resulting in waste of resources

[0003] High-sulfur coal refers to coal with a sulfur content > 3%. my country’s coal resources rank second in the world, but the per capita exploitable amount is only 52 tons (the world’s per capita share is 173 tons), of which about 8% is high-sulfur coal. The acid mist produced by direct combustion will pollute the atmosphere, which does not meet the requirements of environmental protection. The desulfurization treatment and then selling it as fuel will increase the cost of coal enterprises. How to make good use of high-sulfur coal without producing sulfur pollution is a major long-term research topic in my country

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