A method for removing chloride ions in chlorinated sulfuric acid solution using a photocatalytic fluidized bed

A fluidized bed and photocatalytic technology, applied in the fields of environmental protection, chemical industry, and metallurgy, can solve the problems of low electric adsorption and absorption, and achieve the effects of reducing concentration polarization, high economic benefits, and improving efficiency

Active Publication Date: 2021-01-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Electrosorption has the problem of low absorption

Method used

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  • A method for removing chloride ions in chlorinated sulfuric acid solution using a photocatalytic fluidized bed

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Experimental program
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Effect test

Embodiment 1

[0030] figure 1 It is a schematic flow chart of a method for removing chloride ions in a chlorine-containing sulfuric acid solution by using a photocatalytic fluidized bed according to the present invention.

[0031] to combine figure 1 , a method for removing chloride ions in a chlorinated sulfuric acid solution using a photocatalytic fluidized bed used in this embodiment, said method comprising photocatalytic fluidized bed dechlorination process 1, deep dechlorination process 2, milk of lime absorption Operation 3 and sodium hydroxide solution absorption operation 4 four operations, concretely carry out according to the following steps:

[0032] 1) The chlorine-containing sulfuric acid solution is sent to the photocatalytic fluidized bed dechlorination process, and under the action of ultraviolet light irradiation, high-efficiency photocatalysis is realized to obtain chlorine-rich gas and dechlorinated sulfuric acid solution;

[0033] 2) The chlorine-rich gas is sent to th...

Embodiment 2

[0037] This embodiment uses a method for removing chloride ions in a chlorinated sulfuric acid solution using a photocatalytic fluidized bed as described in Example 1. The concentration of chloride ions in the chlorinated sulfuric acid solution is 0.3 g / L, and the concentration of sulfuric acid is 0.5 g / L. M. The catalyst in the photocatalytic fluidized bed dechlorination step 1 is titanium dioxide, the catalyst carrier is activated carbon, and the diameter of the catalytic particles is 20 μm. In the photocatalytic fluidized bed dechlorination step 1, the operating linear velocity is 0.001 m / s, the bed expansion ratio is 1.1, and the temperature is 20°C. In the deep dechlorination step 2, the additive is hypochlorous acid, and the amount added is 1.0 times the amount of residual chlorine, and the concentration of chloride ions in the obtained qualified sulfuric acid solution is within 30 mg / L. In the lime milk absorption step 3, the mass fraction of lime milk is 40%, and the ...

Embodiment 3

[0039]This embodiment uses a method for removing chloride ions in a chlorinated sulfuric acid solution using a photocatalytic fluidized bed as described in Example 1. The chloride ion concentration in the chlorinated sulfuric acid solution is 2.0 g / L, and the concentration of sulfuric acid is 2.5 g / L. M. The catalyst in the photocatalytic fluidized bed dechlorination step 1 is zirconium dioxide, the catalyst carrier is silicon dioxide, and the diameter of the catalytic particles is 3.0 cm. In the photocatalytic fluidized bed dechlorination step 1, the operating linear velocity is 10 m / s, the bed expansion ratio is 3.8, and the temperature is 50°C. In the deep dechlorination step 2, the additive is hypochlorite, and the additive amount is 1.1 times the amount of residual chlorine, and the concentration of chloride ions in the obtained qualified sulfuric acid solution is within 30 mg / L. In the milk of lime absorption process 3, the mass fraction of milk of lime is 60%, and the ...

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Abstract

The invention discloses a method for removing chloride ions in a chlorine-containing sulfuric acid solution through adopting a photocatalytic fluidized bed. The method comprises the procedures of photocatalytic fluidized bed chlorine removing, deep chlorine removing, lime milk absorption and sodium hydroxide solution absorption, specifically, the chlorine-containing sulfuric acid solution is fed to the procedure of photocatalytic fluidized bed chlorination removing, and efficient photocatalysis is realized under the action of ultraviolet rays to obtain chlorine-rich gas and a chlorination-removing sulfuric acid solution; the chlorine-rich gas is fed to the procedure of the lime milk absorption, most of chlorine gas is absorbed to obtain a bleaching powder product, and the remaining part ofchlorine-containing gas is fed to the procedure of the sodium hydroxide solution absorption; the chlorination-removing sulfuric acid solution is fed to the procedure of deep chlorination removing, and a qualified sulfuric acid solution is obtained under the action of an additive, and generated micro chlorine gas is fed to the procedure of the sodium hydroxide solution absorption; and the chlorine-containing gas and the micro chlorine gas are absorbed by a sodium hydroxide solution to obtain a bleaching solution product, and remaining harmless tail gas is drained. The method has the advantagesof being short in process, low in energy consumption, environmentally-friendly, and the like.

Description

technical field [0001] The invention belongs to the fields of metallurgy, chemical industry and environmental protection, and in particular relates to a method for removing chloride ions in a chlorine-containing sulfuric acid solution by using a photocatalytic fluidized bed. Background technique [0002] Chlorine-containing sulfuric acid solution is a common solution system in industrial production, which is widely used in metallurgical and chemical industries, especially in the field of hydrometallurgy of non-ferrous metals. Taking zinc hydrometallurgy as an example, the concentration of chloride ions in the electrolyte is too high , will seriously aggravate the corrosion of system equipment, reduce the service life of the anode plate, increase production costs, and the overflow of chlorine-containing acid mist into the air will seriously affect the production environment. Therefore, the research and development of the technology of removing chloride ions from the sulfuric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/16C25C7/06C22B19/20C22B3/08C01B11/06
CPCC01B11/064C22B3/08C22B19/22C25C1/16C25C7/06
Inventor 范川林朱庆山杨海涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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