Method for preparing sulfuric acid by reducing and decomposing gypsum with pyrite

A technology of pyrite and gypsum, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve problems such as non-innovative, easy to popularize and apply, short production cycle, reduction decomposition temperature and energy consumption Reduced effect

Inactive Publication Date: 2012-07-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method for making acid from pyrite proposed in this invention patent is not innovative in essence, it just simply superimposes two main raw materials for making acid, and the acid making process also fails to target iron pyrite in my country. The status quo of mine acid production proposes an innovative process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Anhydrous phosphogypsum with a moisture content of 0.1% and pyrite with a moisture content of 15% are ground to an average particle size of 20 μm, the active ingredient in the pyrite is ferrous disulfide and the active ingredient in the phosphogypsum is calcium sulfate The molar ratio of the mixture is 0.5:10, and then the above-mentioned mixed material is added into a reactor at a temperature of 1300° C., and roasted for 4 hours under a reducing atmosphere of nitrogen, carbon monoxide and sulfur dioxide. The volume fraction of sulfur dioxide in the tail gas is measured by a flue gas comprehensive analyzer. 20%. The sulfur dioxide in the tail gas is sent to make sulfuric acid; the decomposition rate of phosphogypsum is 99.9%.

Embodiment 2

[0024] Grind hemihydrate salt gypsum with a moisture content of 10% and pyrite with a moisture content of 8% to an average particle size of 50 μm. The molar ratio is 3:10, and the mixed material is put into a reactor at a temperature of 1000° C., roasted for 1 hour under an inert atmosphere of nitrogen and sulfur dioxide, and the volume fraction of sulfur dioxide in the exhaust gas is measured to be 12% by a flue gas comprehensive analyzer. The sulfur dioxide in the tail gas is sent to make sulfuric acid; the decomposition rate of hemihydrate salt gypsum is 87.2%.

Embodiment 3

[0026] Grind hemihydrate desulfurized gypsum with a moisture content of 5% and pyrite with a moisture content of 0.1% to an average particle size of 500 μm. The molar ratio is 5:10, the mixed material is put into a reactor at a temperature of 800°C, roasted for 2 hours under a weakly oxidizing atmosphere of nitrogen, a small amount of oxygen and sulfur dioxide, and the volume fraction of sulfur dioxide in the tail gas is measured by a flue gas comprehensive analyzer. 6%. The sulfur dioxide in the tail gas is sent to sulfuric acid; the decomposition rate of desulfurized gypsum is 45.5%.

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Abstract

The invention discloses a method for preparing sulfuric acid by reducing and decomposing gypsum with pyrite. The method is characterized by comprising the following steps of: grinding the semi-hydrated gypsum with moisture content of 0.1-10% or anhydrous gypsum and pyrite with moisture content of 0.1-15% until the average particle size is 1-500 microns, wherein the molar ratio of the effective component ferrous disulfide in pyrite to the effective component calcium sulfate in gypsum is (0.5-5):10; adding the mixture into a reactor at a temperature of 800-1300 DEG C; baking for 0.1-4 hours in an inertia, weak-oxidizing or reducing atmosphere; and preparing sulfuric acid from the produced sulfur dioxide tail gas. According to the invention, the gypsum reducing and decomposing rate is high, the reducing and decomposing temperature and energy consumption are low, the technology is simple, the production cycle is short, and the method is easy to control and convenient to popularize.

Description

technical field [0001] The invention relates to a method for producing sulfuric acid by reducing and decomposing gypsum from pyrite, and belongs to the technical field of reducing and decomposing gypsum. Background technique [0002] my country has rich reserves of gypsum mineral resources, and the total proven reserves of various types of gypsum are about 57 billion tons, ranking first in the world. At the same time, with the development of my country's industry, the output of various industrial by-products of gypsum has also increased rapidly, including desulfurization gypsum produced by coal-fired thermal power generation, phosphogypsum and salt gypsum discharged from wet-process phosphoric acid production, citrate gypsum, fluorogypsum, titanium The by-products of white powder are gypsum and nickel gypsum, especially desulfurized gypsum and phosphogypsum. [0003] According to statistics, in 2009 alone, my country's wet-based desulfurization gypsum was about 43 million to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
Inventor 杨林杨秀山张志业王辛龙钟本和
Owner SICHUAN UNIV
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