Recycling treatment method of tail gas from industrial-tungsten smelting process

Abstract

The invention relates to the field of industrial-tungsten smelting and particularly relates to a recycling treatment method of tail gas from industrial-tungsten smelting. The recycling treatment method comprises the following steps: (1) collection and conveyance of tail gas: collecting the tail gas produced in the production process of industrial tungsten into a main pipe, and then conveying the tail gas into a first-stage tail-gas absorbing tower; (2) first-stage tail-gas absorbing treatment: after carrying out mass-transfer heat exchange on the tail gas entering the first-stage absorbing andconcentrating tower by utilizing own low-concentration cooling liquid of the tail gas, condensing to form high-concentration condensate and then recycling; (3) second-stage tail-gas absorbing treatment: conveying non-condensable gas, unabsorbed gas and other gas impurities in the first-stage absorbing and concentrating tower into a second-stage absorbing tank, adopting process water or other solution for secondary absorbance, recycling after thickening of secondarily-absorbed solution, and when the waste gas reaches the standard, exhausting the waste gas. The method and equipment provided bythe invention have the advantages that the cost is low, no other solution needs to be added, no intermediate substances are produced, the treatment is thorough and the recycling is achieved.

Description

technical field [0001] The invention relates to the field of industrial tungsten smelting, in particular to a treatment method and equipment for recycling tail gas in the industrial tungsten smelting process. Background technique [0002] Since the tail gas discharged from the industrial tungsten smelting process contains ammonia, ammonium sulfide and water vapor, if it is directly discharged into the atmosphere, it will have a great impact on air quality and cause waste of resources. Using the primary absorption method, the tail gas is passed into the primary absorption and concentration tower, and after the acid liquid is absorbed and heat-exchanged and condensed, the waste gas and condensate are discharged up to the standard. This treatment method requires the addition of acid solution, which increases the cost, not only It has caused a great waste of resources, and will produce intermediate substances, and the exhaust gas is not treated thoroughly, and there are still no...

AI Technical Summary

Problems solved by technology

[0002] Since the tail gas discharged from the industrial tungsten smelting process contains ammonia, ammonium sulfide and water vapor, if it is directly discharged into the atmosphere, it will have a great impact on air quality and cause waste of resources. Using the primary absorption method, the tail gas is passed into the primary absorption and concentration tower, and after the acid liquid is absorbed and heat-exchanged and condensed, the waste gas and condensate are discharged up to the standard. This treatment method requires the addition of acid solution, which increases the cost, not only It has caused a great waste of resources, and will produce intermediate substances, and the exhaust gas is not treated thoroughly, and there are still non-condensable gases, which will be discharged into the atmosphere, which will have a certain impact on air quality, and its treatment equipment simply uses a demisting device, it will cause incomplete absorption and treatment

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