Comprehensive recovery and treatment method for electrolytic chlorine-containing waste gas

A technology of recycling and exhaust gas recovery, applied in the electrolysis process, electrolysis components, separation methods, etc., can solve the problems of complex catalyst use, high chlorine recovery cost, increase recovery cost, etc. Environmental benefit, low cost control effect

Inactive Publication Date: 2017-11-17
弘毅天承知识产权股份有限公司
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Problems solved by technology

[0003] At present, in the prior art, by recovering chlorine-containing waste gas through lye, and using a catalyst decomposition method to generate NaClO, a qualified NaCl solution is obtained, and the NaCl electrolyte is recycled. However, the above-mentioned technical solution has the following disadvantages: 1. The use of catalyst is complicated, the dosage is large, th

Method used

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  • Comprehensive recovery and treatment method for electrolytic chlorine-containing waste gas

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Embodiment 1

[0035] In a sponge titanium production line, the waste gas produced by electrolysis of MgCl2 contains 8% chlorine (volume percentage). The chlorine-containing waste gas is collected by the tail gas recovery device. The dust solid particles then flow into the comprehensive absorption tank. The top of the comprehensive absorption tank has a spout and a spray tower. The spray tower is equipped with a NaOH solution with a concentration of 29% by weight. The NaOH solution sprays and washes the chlorine-containing waste gas in the comprehensive absorption tank through the spout on the top of the comprehensive absorption tank. The solution after the chlorine waste gas is measured by the iodometric method to contain 189.5g / l of chlorine in NaClO, and the chlorine content of NaOH is 11.6g / l as measured by the acid-base titration method. Take 500L of the mixed solution after washing, and add hydrochloric acid with a concentration of 12% by weight as an acid regulator to adjust the pH va...

Embodiment 2

[0039]A chemical plant electrolyzes NaCl to produce electrolysis waste gas with a chlorine content of 0.9% (volume percentage). The chlorine-containing waste gas is collected through the tail gas recovery device. When the mixed gas is input into the comprehensive absorption tank through the input pipeline, the dust carried by it is first removed by the dust collector. The solid particles then flow into the comprehensive absorption tank. The top of the comprehensive absorption tank has a spout and a spray tower. The spray tower is equipped with a NaOH solution with a concentration of 32% by weight. The NaOH solution sprays and washes the chlorine-containing waste gas in the comprehensive absorption tank through the spout on the top of the comprehensive absorption tank. The solution after the chlorine waste gas was measured by iodometric method to contain 79.5g / l of chlorine in NaClO, and the chlorine content of NaOH was 65.3g / l as measured by acid-base titration. Get the mixed ...

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Abstract

The invention provides a comprehensive recovery and treatment method for electrolytic chlorine-containing waste gas. The method comprises steps as follows: solid particles such as carried dust and the like in the electrolytic chlorine-containing waste gas collected by a tail gas recovery device are removed, a NaOH solution with the weight percentage concentration being 29%-35% is sprayed to the chlorine-containing waste gas to wash the chlorine-containing waste gas, and pH value of the mixed solution is regulated to 1-2; the mixed solution is heated and subjected to vacuum pumping, and chlorine-containing steam is separated out; the chlorine-containing steam is introduced into a concentrated acid drying tower for drying treatment to prepare a finished chlorine gas product or pure chlorine gas is introduced into an anode chamber of an electrolytic cell through backflow, so that content of HClO in an acidic electrolyte solution is increased, and sterilization and disinfection effects of the acidic electrolyte solution are improved. With the implementation of the technical scheme, chlorine gas in the electrolytic chlorine-containing waste gas is recovered and treated with lower cost, chlorine gas is recycled, and economic and environmental benefits are good.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of electrolysis waste gas, in particular to a method for comprehensive recovery and treatment of electrolysis chlorine-containing waste gas. Background technique [0002] In recent years, through the electrolysis of chloride and its aqueous solution (such as NaCl, MgCl2), a large amount of electrolytic chlorine-containing tail gas will be generated in the anode chamber of the electrolytic cell. For example, with the continuous expansion of the application range of titanium metal, the number of sponge titanium enterprises is gradually increasing. , the magnesium electrolysis process has become an important part of the process flow of each sponge titanium production enterprise. In the 18000t / a sponge titanium production line, the chlorine content in the tail gas produced by the electrolysis of MgCl2 in the anode chamber of the electrolytic cell is about 5000t / a, accounting for the an...

Claims

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Application Information

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IPC IPC(8): B01D53/14C01B7/07C25C7/06
CPCB01D53/1418B01D2252/10C01B7/0743C25C7/06
Inventor 赵红昌陈伊苒
Owner 弘毅天承知识产权股份有限公司
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