Method for removing chloride ions in chlorine-containing sulfuric acid solution by adopting fluidized bed electrode

A fluidized bed, chlorosulfuric acid technology, applied in the fields of environmental protection, metallurgy, and chemical industry, can solve the problems of low absorption capacity of electric adsorption, and achieve the effect of improving selectivity, high economic benefit, high economic benefit and environmental protection benefit

Active Publication Date: 2020-03-10
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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  • Method for removing chloride ions in chlorine-containing sulfuric acid solution by adopting fluidized bed electrode

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Embodiment 1

[0034] 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 fluidized bed electrode according to the present invention.

[0035] combine figure 1 , a method for removing chloride ions in a chlorinated sulfuric acid solution using a fluidized bed electrode used in this embodiment, said method comprising a fluidized bed electrode dechlorination process 1, a deep dechlorination process 2, and a primary absorption process 3 , secondary absorption process 4 and deacidification drying process 5 five processes, specifically according to the following steps:

[0036] 1) The chlorine-containing sulfuric acid solution is sent to the fluidized bed electrode dechlorination process, and under the action of direct current, high-efficiency electrochemical oxidation is realized to obtain acid hydrogen gas, chlorine-rich gas and dechlorinated sulfuric acid solution;

[0037] 2) The acid-containing hydrogen is ...

Embodiment 2

[0042] This embodiment uses the method described in Example 1 for removing chloride ions in a chlorinated sulfuric acid solution using a fluidized bed electrode. . The fluidized bed electrode dechlorination process 1 adopts a fluidized bed electrode reactor, adopts a granular anode with a diameter of 20 μm, and an anode current density of 5 A / m 2 , the anode is made of lead alloy; the cathode is plate-shaped, made of stainless steel, and the cathode current density is 50A / m 2 . In the fluidized bed electrode dechlorination process 1, the operating linear velocity is 0.001 m / s, the temperature is 20° C., the bed expansion ratio is 1.1, the voltage is 1.5 V, and the current efficiency is 15%. In the deep dechlorination step 2, the additive is hypochlorous acid, and the dosage is 1.0 times of the amount of residual chlorine, and the concentration of chloride ions in the obtained qualified sulfuric acid solution is within 50 mg / L. In the primary absorption process 3, the absorb...

Embodiment 3

[0044] This embodiment uses a method for removing chloride ions in the chlorine-containing sulfuric acid solution described in Example 1 by using a fluidized bed electrode. The concentration of chloride ions in the chlorine-containing sulfuric acid solution is 10 g / L, and the concentration of sulfuric acid is 5.0M. The fluidized bed electrode dechlorination process 1 adopts a fluidized bed electrochemical reactor, adopts a granular anode with a diameter of 3.0 cm, and an anode current density of 500 A / m 2 , the anode material is titanium-based ruthenium dioxide coating; the cathode is rod-shaped, the material is nickel-based alloy, and the cathode current density is 10000A / m 2 . In the fluidized bed electrode dechlorination process 1, the operating linear velocity is 10m / s, the bed expansion ratio is 3.8, the temperature is 50°C, the voltage is 4.5V, and the current efficiency is 75%. In the deep dechlorination step 2, the additive is hypochlorous acid, and the dosage is 1.1 ...

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Abstract

The invention discloses a method for removing chloride ions in a chlorine-containing sulfuric acid solution by adopting a fluidized bed electrode. The method comprises a fluidized bed electrode dechlorination procedure, a deep dechlorination procedure, a first-stage absorption procedure, a second-stage absorption procedure and a deacidification and drying procedure, specifically, the chlorine-containing sulfuric acid solution is conveyed to the fluidized bed electrode to carry out the dechlorination procedure, and electrochemical oxidation is realized under the action of direct current to obtain acid-containing hydrogen, chlorine-rich gas and dechlorination sulfuric acid solution; the acid-containing hydrogen gas is subjected to the deacidification and drying procedure to obtain the hydrogen product; the chlorine-rich gas is subjected to the first-stage absorption procedure, most of chlorine is absorbed through lime milk to obtain a bleaching powder product, and the rest chlorine-containing gas is subjected to the second-stage absorption procedure; the chlorine-containing sulfuric acid solution is subjected to the deep dechlorination procedure, a qualified sulfuric acid solution isobtained under the action of an additive, and the generated micro-chlorine gas is subjected to the second-stage absorption procedure; and under the action of a sodium hydroxide solution, the chlorine-containing gas and the micro-chlorine gas are absorbed by an absorbent to obtain the bleaching liquid product, and the residual harmless tail gas is exhausted.

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 fluidized bed electrode. 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 acid ...

Claims

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Application Information

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IPC IPC(8): C22B19/20C25C1/16B01D53/78B01D53/68
CPCB01D53/68B01D53/78B01D2257/2025C22B19/20C25C1/16
Inventor 杨海涛朱庆山范川林
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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