Method for utilizing pyrite to simultaneously reduce phosphogypsum and titanium white waste residue green vitriol for producing sulfuric acid

A technology of pyrite and phosphogypsum, applied in chemical instruments and methods, sulfur compounds, iron compounds, etc., can solve the problems of pollution, waste of the environment, and few effective utilization methods, and achieve simple process, high recovery rate, and environmental protection. and significant economic benefits

Inactive Publication Date: 2018-08-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are not many ways to effectively utilize titanium dioxide waste green vitriol, and it is still mainly piled up, resulting in a huge waste of sulfur and iron resources and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Mix pyrite, titanium dioxide waste slag green vitriol, and phosphogypsum that are finely ground to less than 500 μm. The active ingredient ferrous disulfide in pyrite and the active ingredient ferrous sulfate in titanium dioxide waste green vitrila , The effective ingredient calcium sulfate molar ratio in phosphogypsum is 1:3:4;

[0021] (2) The mixture is pressed into tablets and put into the rotary kiln;

[0022] (3) The ball is fired at 1000 ℃ in a nitrogen atmosphere for 120 min to obtain SO 2 Exhaust gas and solid reduction products;

[0023] (4) The SO-containing compound obtained in step (3) 2 After dust removal and purification, the tail gas is sent to the sulfuric acid system to prepare sulfuric acid products. The solid reduction product is calcium ferrite with a purity of 74 wt%;

[0024] (5) In the first embodiment, a flue gas analyzer is used to monitor the SO of the exhaust gas 2 Concentration, its volume percentage content is ≥15%, the decomposition rate of ph...

Embodiment 2

[0026] (1) Mix pyrite, titanium dioxide waste slag green vitriol, and phosphogypsum that are finely ground to less than 250 μm. The active ingredient ferrous disulfide in the pyrite and the active ingredient ferrous sulfate in the titanium dioxide waste green vitriun , The molar ratio of active ingredient calcium sulfate in phosphogypsum is 1:2:3;

[0027] (2) The mixture is pressed into tablets and put into the rotary kiln;

[0028] (3) The ball is fired at 1150 ℃ under a nitrogen atmosphere for 180 min to obtain SO 2 Exhaust gas and solid reduction products;

[0029] (4) The SO-containing 2 After dust removal and purification, the tail gas is sent to the sulfuric acid system to prepare sulfuric acid products. The solid reduction product is calcium ferrite with a purity of 87 wt%;

[0030] (5) In the second embodiment, a flue gas analyzer is used to monitor the SO of the exhaust gas 2 Concentration, its volume percentage content is greater than or equal to 15%, the decomposition rate...

Embodiment 3

[0032] Mix pyrite, titanium dioxide waste slag green vitriol, and phosphogypsum that are finely ground to less than 250 μm. The active ingredients in pyrite are ferrous disulfide, and the active ingredients of titanium dioxide waste green vitriun are ferrous sulfate and phosphogypsum. The effective ingredient calcium sulfate in the molar ratio is 1:3:4;

[0033] (2) The mixture is pressed into tablets and put into the rotary kiln;

[0034] (3) The ball is fired at 1200 ℃ under a nitrogen atmosphere for 120 min to obtain SO 2 Exhaust gas and solid reduction products;

[0035] (4) The SO-containing compound obtained in step (3) 2 After dust removal and purification, the tail gas is sent to the sulfuric acid system to prepare sulfuric acid products. The solid reduction product is calcium ferrite with a purity of 79 wt%;

[0036] (5) In the third embodiment, a flue gas analyzer is used to monitor the SO of the exhaust gas 2 Concentration, its volume percentage content is greater than or e...

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PUM

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Abstract

The invention discloses a method for utilizing pyrite to simultaneously reduce phosphogypsum and titanium white waste residue green vitriol for producing sulfuric acid. The technological process comprises the following steps: evenly mixing the pyrite, the phosphogypsum and the titanium white waste residue green vitriol, which are finely ground into a certain particle size, according to a certain proportion; (2) after the mixture is tabletted, directly enabling the mixture to react for a certain period of time at certain temperature to obtain a solid reduced product and SO2-containing tail gas,wherein the obtained solid reduced product is used as a pre-melt type steelmaking slagging agent; (3) carrying out dust removal and purification on the SO2-containing tail gas obtained in the step (2), and then sending the purified product to a sulfuric acid system to prepare the finished product sulfuric acid. The process utilizes the pyrite to simultaneously reduce the phosphogypsum and the titanium white waste residue green vitriol producing sulfuric acid, thus realizing the treatment and recycling of the phosphogypsum and the titanium white waste residue green vitriol, and obtaining sulfuric acid and the steelmaking slagging agent-calcium ferrite product. The phosphogypsum decomposition rate of the method can reach 98wt% or above, the SO2 concentration of the kiln gas can reach 15 vol% or above, and the purity of the solid phase product calcium ferrite can reach 90wt% or above. The method is simple in process, free from discharge of three wastes, and remarkable in environmental and economic benefit advantages.

Description

Technical field [0001] The invention belongs to the technical field of chemical metallurgy, and mainly relates to a method for simultaneously preparing sulfuric acid and calcium ferrite by using pyrite, titanium dioxide waste residue, green vitriol, and phosphogypsum. Background technique [0002] Phosphogypsum is an industrial waste generated by the reaction between phosphate rock and sulfuric acid during the production of wet-process phosphoric acid. The main component is calcium sulfate, and it also contains impurities such as iron, aluminum, phosphorus, and silicon. At present, phosphogypsum is mainly processed in open-air storage except part of its use in the production of building materials. Increasing the development of effective ways of large-scale utilization of phosphogypsum is of great significance for achieving the sustainable development of the phosphate fertilizer industry, avoiding excessive occupation of land resources and protecting the environment. [0003] The r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/50C01G49/00C21C7/076
CPCC01B17/508C01G49/0081C01P2006/80C21C7/076Y02P10/20
Inventor 吕莉唐盛伟郑东钥陈彦逍张涛
Owner SICHUAN UNIV
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