Method for preparing sulfuric acid from smelting fume

A technology for smelting flue gas and sulfuric acid, applied in separation methods, chemical instruments and methods, sulfur compounds, etc., can solve the problems of low sulfuric acid purity, low sulfur conversion rate, incomplete furnace gas purification, etc., to improve the purity and quality. , the effect of increasing product revenue and reducing environmental protection costs

Inactive Publication Date: 2018-06-12
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

It is used in non-ferrous smelting, petroleum refining and petrochemical industry, 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. Iron and steel pickling At present, the traditional process of preparing sulfuric acid from smelting flue gas has problems such as incomplete purification of furnace gas, low conversion rate of sulfur element, and low purity of sulfuric acid produced.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing sulfuric acid from flue gas smelting, comprising the following steps:

[0022] (1) cooling and drying the sulfur-containing flue gas through deep purification, the drying treatment is to use dilute sulfuric acid with a concentration of 35% to dry, so that the moisture in the sulfur-containing flue gas is transferred to the dilute sulfuric acid; The deep purification is to use silicon nitride porous ceramic filter to filter and remove sulfur-containing flue gas. The silicon nitride porous ceramic filter is made of silicon nitride foam ceramic material composed of silicon nitride, silicon oxide and zirconia. The mass ratio of silicon nitride, silicon oxide and zirconia is 80:4:12; the dust content of sulfur-containing flue gas after dust removal is 0.10g / Nm 3 ; After cooling down, the temperature of the sulfur-containing flue gas is controlled at 300°C;

[0023] (2) Then the dried sulfur-containing flue gas is sent to the V-containing 2 o 5 The c...

Embodiment 2

[0028] A method for preparing sulfuric acid from flue gas smelting, comprising the following steps:

[0029] (1) cooling and drying the sulfur-containing flue gas through deep purification, the drying treatment is to use dilute sulfuric acid with a concentration of 30% to dry, so that the moisture in the sulfur-containing flue gas is transferred to the dilute sulfuric acid; The deep purification is to use silicon nitride porous ceramic filter to filter and remove sulfur-containing flue gas. The silicon nitride porous ceramic filter is made of silicon nitride foam ceramic material composed of silicon nitride, silicon oxide and zirconia. The mass ratio of silicon nitride, silicon oxide and zirconia is 80:3:10; the dust content of sulfur-containing flue gas after dust removal is 0.08g / Nm 3 ; After cooling down, the temperature of the sulfur-containing flue gas is controlled at 280°C;

[0030] (2) Then the dried sulfur-containing flue gas is sent to the V-containing 2 o 5 The c...

Embodiment 3

[0035] A method for preparing sulfuric acid from flue gas smelting, comprising the following steps:

[0036] (1) cooling and drying the sulfur-containing flue gas through deep purification, the drying treatment is to use dilute sulfuric acid with a concentration of 45% to dry, so that the moisture in the sulfur-containing flue gas is transferred to the dilute sulfuric acid; The deep purification is to use silicon nitride porous ceramic filter to filter and remove sulfur-containing flue gas. The silicon nitride porous ceramic filter is made of silicon nitride foam ceramic material composed of silicon nitride, silicon oxide and zirconia. The mass ratio of silicon nitride, silicon oxide and zirconia is 80:5:15; the dust content of sulfur-containing flue gas after dust removal is 0.12g / Nm 3 ; After cooling down, the temperature of the sulfur-containing flue gas is controlled at 320°C;

[0037] (2) Then the dried sulfur-containing flue gas is sent to the V-containing 2 o 5 The c...

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Abstract

The invention discloses a method for preparing sulfuric acid from smelting fume. The method includes steps of (1), carrying out cooling and drying treatment on the sulfur-containing fume which is already subjected to depth purification; (2), delivering the sulfur-containing fume into a converter with catalyst bed layers after the drying treatment is carried out on the sulfur-containing fume, carrying out heat exchange on the fume by the aid of the converter, and converting sulfur dioxide in the fume into sulfur trioxide; (3), allowing converted gas exhausted from the converter to flow into anabsorption tower to be in direct contact with concentrated sulfuric acid, carrying out sufficient absorption, and discharging the sulfuric acid and the tail gas subjected absorption; (4), carrying outstandard reaching treatment on the tail gas discharged at the step (3) and then carrying out evacuation. The drying treatment includes drying the sulfur-containing fume by the aid of dilute sulfuricacid with the concentration of 30-45%, so that water in the sulfur-containing fume can be transferred into the dilute sulfuric acid. The method has the advantages that filtration, dust removal and purification can be effectively carried out by the aid of the method, accordingly, more than 95% of dust in the fume can be removed, the purity and the quality of the sulfuric acid can be improved, the sulfur element recycling rate can be higher than 94%, and the method has an obvious economic benefit.

Description

technical field [0001] The invention belongs to the technical field of sulfuric acid preparation, and in particular relates to a method for preparing sulfuric acid from 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 manufacture inorganic chemical fertilizers, and secondarily as a basic chemical raw material. Used in non-ferrous smelting, petroleum refining and petrochemical industry, textile printing and dyeing, inorganic salt industry, certain inorganic and organic acids, rubber industry, paint industry, national defense and military industry, pesticide medicine, tanning, coking and other industrial sectors. Iron and steel pickling At present, the traditional process of preparing sulfuric acid from smelting flue gas has problems such as incomplete purification of furnace gas, low conversion rate of sulfur element, and low purity of sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/76B01D46/00B01D53/86B01D53/50
CPCB01D46/00B01D53/8609C01B17/76
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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