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Device and method for recovering sulfur in acidolysis tail gas

A technology for recovering acid and tail gas, which is applied in separation methods, sulfur preparation/purification, chemical instruments and methods, etc., and can solve problems such as waste of resources, high consumption of lye, and high cost of tail gas treatment

Active Publication Date: 2017-03-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Luo Wusheng, the author of China Paint (No. 10, 2005), "Treatment of Acidolysis Tail Gas from Titanium Dioxide Plant" introduced several improvement measures for acidolysis tail gas to meet the emission standards, specifically by replacing fans, valves and hydrogen peroxide to oxidize SO 2 The method to make acid hydrolysis tail gas meet the standard discharge, although it involves the wear resistance of the exhaust fan, the measure adopted is to replace the fan material, not to reduce the amount of sulfur particles
[0008] It can be seen that the above literature only involves the tail gas treatment method, and the use of lye to neutralize the sulfur in the tail gas to make it discharge up to the standard, and the lye neutralizes the sulfur in the tail gas and then discharges it into the waste liquid pool. This treatment method not only The sulfur in it is not recovered, resulting in waste of resources, and the consumption of lye is high, and the cost of tail gas treatment is relatively high

Method used

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  • Device and method for recovering sulfur in acidolysis tail gas

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Effect test

Embodiment 1

[0029] Put 30t of pyrite into the acidolysis pot for acidolysis. The acidolysis is carried out in an intermittent acidolysis mode. When the acidolysis is carried out, the device for recovering sulfur in the acidolysis tail gas described in the present invention is opened. In this device, the air volume of the blower is acid 40% of the air volume of the tail gas is removed, the sulfur in the tail gas fully reacts with the air, and the generated sulfur powder is separated from the tail gas through a cyclone separator, and the separated sulfur powder is 18kg. After recovering sulfur, the tail gas enters the Venturi and the alkali spray tower for further neutralization and desulfurization treatment. The concentration of the dilute alkali solution used for the treatment is 5%, the temperature is 20°C, and the sulfur content in the treated tail gas is less than 180ppm / Nm 3 , has reached the national standard for sulfur content emission indicators, and can be discharged into the atmos...

Embodiment 2

[0031] Adopt ilmenite acid hydrolysis, acid hydrolysis adopts continuous acid hydrolysis mode to carry out, when acid hydrolysis is carried out, open the device of the present invention to reclaim sulfur in acid hydrolysis tail gas, in this device, blower air volume is 25% of acid hydrolysis tail gas air volume , The sulfur in the tail gas fully reacts with the air, and the generated sulfur powder is separated from the tail gas through a cyclone separator. The separated sulfur powder is 0.7kg per ton of ilmenite. After recovering sulfur, the tail gas enters the Venturi and the alkali spray tower for further neutralization and desulfurization treatment. The concentration of the dilute alkali solution used for the treatment is 3%, the temperature is 25°C, and the sulfur content in the treated tail gas is less than 150ppm / Nm 3 , has reached the national standard for sulfur content emission indicators, and can be discharged into the atmosphere. It is calculated that after sulfur i...

Embodiment 3

[0033]Put 30t of pyrite into the acidolysis pot for acidolysis. The acidolysis is carried out by intermittent acidolysis. When the acidolysis is carried out, the device for recovering sulfur in the acidolysis tail gas according to the present invention is opened. In this device, the air volume of the blower is acid 50% of the air volume of the tail gas is removed, the sulfur in the tail gas fully reacts with the air, and the generated sulfur powder is separated from the tail gas through a cyclone separator, and the separated sulfur powder is 17.5kg. After recovering sulfur, the tail gas enters the Venturi and the alkali spray tower for further neutralization and desulfurization treatment. The concentration of the dilute alkali solution used for the treatment is 10%, the temperature is 35°C, and the sulfur content in the treated tail gas is less than 180ppm / Nm 3 , has reached the national standard for sulfur content emission indicators, and can be discharged into the atmosphere....

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Abstract

The invention discloses a device and method for recycling sulfur in acidolysis exhaust gas. The device comprises an exhaust gas conveying pipeline, a Venturi tube and an alkali spraying tower. An air conveying pipeline, a cyclone separator and an air blower are added. After being mixed, acidolysis exhaust gas and air enter the cyclone separator for reaction and separation, and residual gas sequentially passes through the Venturi tube and the alkali spraying tower to be exhausted. When the device is used for recycling sulfur in acidolysis exhaust gas, air with the volume of the acidolysis exhaust gas being 20%-50% and the acidolysis exhaust gas are mixed and subjected to a reaction to generate sulfur, then, the cyclone separator is used for separating out and recycling the sulfur, and the residual exhaust gas passes through the Venturi tube and the alkali spraying tower for neutralization and desulfuration to be exhausted into the atmosphere. By means of the device and method, 0.5-0.8 kg of sulfur can be recycled from the acidolysis exhaust gas generated by ilmenite per ton, the exhausted gas can reach the exhaust emission index of the sulfur content of the national standard, and the consumption of dilute alkali is only 20-60% that of a traditional mode.

Description

technical field [0001] The invention relates to the field of titanium dioxide preparation by sulfuric acid method, more specifically, the invention relates to a device and a method for recovering sulfur in acidolysis tail gas in the process of preparing titanium dioxide by sulfuric acid method. Background technique [0002] As the main production process of titanium dioxide production in my country, the sulfuric acid method is the choice of the characteristics of titanium ore resources and market rules. The clean development of sulfuric acid titanium dioxide production is an inevitable requirement of social development in my country, and acidolysis tail gas treatment is an important content of sulfuric acid titanium dioxide clean production. [0003] Acidolysis tail gas is the tail gas produced during the acidolysis process, and the tail gas mainly contains acid mist, SO 2 、H 2 S and a large amount of water vapor, there are two commonly used treatment methods in production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/02B01D53/78B01D53/50B01D53/52
Inventor 杜剑桥罗志强张强李礼李小雷
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP