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Method for preparing sulfuric acid from iron pyrite smelting flue gas

A technology of pyrite and flue gas, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of low sulfuric acid purity, low conversion rate of sulfur element, difficult acid mist, etc., to reduce environmental protection costs, Effects of improving purity and quality and increasing product revenue

Inactive Publication Date: 2018-05-08
广西生富锑业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production of sulfuric acid from pyrite smelting flue gas is the main sulfuric acid production method, but the traditional sulfuric acid production process from pyrite has low sulfur burning rate, incomplete furnace gas purification, low sulfur conversion rate, and the acid mist generated during the preparation process is difficult. Problems such as control and low purity of sulfuric acid produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing sulfuric acid from pyrite smelting flue gas consists of the following steps:

[0022] (1) After the sulfur-containing flue gas after smelting pyrite undergoes a cooling, dust removal, pickling, and defogging treatment, the raw flue gas is filtered through a flue gas filter; after a cooling, the temperature of the sulfur-containing flue gas Controlled to 300℃; the dust content of sulfur-containing flue gas after dust removal is 0.13g / Nm 3 ;Pickling is leaching with dilute sulfuric acid with a mass fraction of 8%; after a demisting, the acid mist content of sulfur-containing flue gas is less than 0.012g / Nm 3 ;

[0023] (2) The filtered flue gas is sent to the converter containing the catalyst bed, the flue gas passes through the converter for heat exchange, and the sulfur dioxide in the flue gas is converted into sulfur trioxide; the catalyst is V 2 O 5 , The temperature of the conversion reaction is 350°C;

[0024] (3) The converted gas discharged from th...

Embodiment 2

[0028] A method for preparing sulfuric acid from pyrite smelting flue gas consists of the following steps:

[0029] (1) After the sulfur-containing flue gas after smelting pyrite undergoes a cooling, dust removal, pickling, and defogging treatment, the raw flue gas is filtered through a flue gas filter; after a cooling, the temperature of the sulfur-containing flue gas Controlled to 280℃; dust content of sulfur-containing flue gas after dust removal is 0.15g / Nm 3 ;Pickling is leaching with dilute sulfuric acid with a mass fraction of 10%; after a demisting, the acid mist content of the sulfur-containing flue gas is less than 0.012g / Nm 3 ;

[0030] (2) The filtered flue gas is sent to the converter containing the catalyst bed, the flue gas passes through the converter for heat exchange, and the sulfur dioxide in the flue gas is converted into sulfur trioxide; the catalyst is V 2 O 5 , The temperature of the conversion reaction is 280°C;

[0031] (3) The conversion gas discharged from ...

Embodiment 3

[0035] A method for preparing sulfuric acid from pyrite smelting flue gas consists of the following steps:

[0036] (1) After the sulfur-containing flue gas after smelting pyrite undergoes a cooling, dust removal, pickling, and defogging treatment, the raw flue gas is filtered through a flue gas filter; after a cooling, the temperature of the sulfur-containing flue gas Controlled to 320℃; dust content of sulfur-containing flue gas after dust removal is 0.15g / Nm 3 ;Pickling is leaching with dilute sulfuric acid with a mass fraction of 10%; after a demisting, the acid mist content of the sulfur-containing flue gas is less than 0.012g / Nm 3 ;

[0037] (2) The filtered flue gas is sent to the converter containing the catalyst bed, the flue gas passes through the converter for heat exchange, and the sulfur dioxide in the flue gas is converted into sulfur trioxide; the catalyst is V 2 O 5 , The temperature of the conversion reaction is 320°C;

[0038] (3) The conversion gas discharged from ...

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PUM

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Abstract

The invention discloses a method for preparing sulfuric acid from iron pyrite smelting flue gas. The method comprises the following steps: (1) filtering raw material flue gas through a flue gas filterafter performing once cooling, dust removal, pickling and once demisting treatment on sulfur-containing flue gas obtained by iron pyrite smelting; (2) feeding the filtered flue gas into a converter containing a catalyst bed layer, enabling the flue gas to perform heat exchange through the converter, and converting sulfur dioxide in flue gas into sulfur trioxide; (3) introducing converted gas discharged by the converter into an absorption tower to directly contact concentrated sulfuric acid, sufficiently absorbing, and separately discharging absorbed sulfuric acid and tail gas; and (4) performing secondary demisting on the discharged tail gas through a demister after secondary cooling, and discharging. According to the method, a series of deep purifying treatment is performed on the sulfur-containing flue gas, purity and quality of sulfuric acid are improved, a sulfur element recovery rate greater than 92% can be realized, product income of enterprises is increased, environment-friendly cost is reduced, and the economic benefit is obvious.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and in particular relates to a method for preparing sulfuric acid from pyrite smelting flue gas. Background technique [0002] Sulfuric acid is one of the important basic chemical raw materials and an important product in the chemical industry. It is mainly used to make inorganic chemical fertilizers, and secondly as a basic chemical raw material. Used in non-ferrous smelting, petroleum refining and petrochemicals, textile printing and dyeing, inorganic salt industry, certain inorganic and organic acids, rubber industry, paint industry, national defense and military industry, pesticide and medicine, tanning, coking and other industrial sectors, in addition to Steel pickling. [0003] The production of sulfuric acid from pyrite smelting flue gas is the main method of sulfuric acid production. However, the traditional sulfuric acid preparation process of pyrite has low sulfur burning r...

Claims

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Application Information

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IPC IPC(8): C01B17/78C01B17/74
CPCC01B17/74C01B17/78
Inventor 韦建初韦竣严兰岱龙何正军陆宏卫曹应科卢忠讲
Owner 广西生富锑业科技股份有限公司
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