Waste gas desulfurizing method with composite absorbant comprising pyrolusite and pH buffering agent

Abstract

The present invention is method of comprehensively utilizing waste SO2 gas resource and pyrolusite, and the method includes utilizing the composite absorbent comprising pyrolusite slurry and pH buffering agent to produce oxidation-reduction and neutralizing reaction with waste SO2 gas to eliminate SO2 from the waste gas, purifying the absorbed tail liquid to obtain manganese sulfate product through direct evaporating crystallization or metal manganese product through DC electrolysis, and treating the anode liquid to obtain high purity manganese carbonate product and ammonium sulfate product. The present invention realizes treatment of waste with waste to recover sulfur resource and comprehensively utilize pyrolusite. The method of the present invention is reasonable and has no secondary pollution.

Description

1. Technical field [0001] The invention relates to a method for absorbing sulfur dioxide in exhaust gas based on pyrolusite as an absorbent, which is used for the treatment of exhaust gas containing sulfur dioxide and the development and utilization of pyrolusite, and is a method for recycling sulfur resources and comprehensively utilizing manganese resources. 2. Background technology [0002] Electrolytic manganese metal has a wide range of uses. In addition to being mainly used in the iron and steel industry for refining alloy steel, such as stainless steel, special alloy steel, stainless steel electrodes, etc., it can also be used in non-ferrous alloys, chemicals, medicine, food, analysis, scientific research, etc., so manganese deficiency Most countries usually reserve it as a strategic material. The production process of traditional electrolytic manganese metal mainly includes two steps of preparation of manganese sulfate electrolyte and electrolysis. Wherein the produ...

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Problems solved by technology

The applicant disclosed in the Chinese Patent Gazette is Guangxi University, and the patent application number is 89107720.0 "A new method for producing industrial manganese sulfate by absorbing sulfur dioxide from pyrolusite pulp", the process absorption process clearly recorded in the patent application documents, which is used to absorb the absorption of sulfur dioxide The agent is pyrolusite pulp only, no other absorbent components are mentioned

The patent application number disclosed in the Chinese Patent Gazette is 200420033268.7, and the name is "flue gas desulfurization resource utilization equipment". The process absorption process clearly recorded in the application document, the pulp entering the reactor is pure pyrolusite pulp, that is, only pyrolusite Slurry is absorbent, no additives added to other ingredients

[0007] The above-mentioned methods of using pyrolusite pulp to absorb and remove sulfur dioxide in the flue gas in the prior art all have such a deficiency, that is, in the pyrolusite pulp to absorb SO in the exhaust gas 2 In the absorption reaction system, the sulfuric acid formed affects the SO in the waste gas 2 Absorption and leaching of manganese from pyrolusite, SO 2 The absorption rate of manganese and the leaching rate of manganese in pyrolusite are not high, which leads to the low purification rate of exhaust gas desulfurization and the low utilization rate of manganese

In addition, as far as the inventor knows, the current method of absorbing and removing sulfur dioxide in the flue gas with pyrolusite pulp is to only obtain the manganese sulfate product after the absorption tail liquid containing manganese sulfate after desulfurization is processed, and for further utilization of it The research results of producing electrolytic manganese and other products have not been reported

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