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Method for adsorbing and removing chlorine from strong acidic solution

A strong acid, dechlorination technology, applied in the field of adsorption and dechlorination, to achieve good dechlorination effect

Active Publication Date: 2019-01-11
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for a long time, almost no one has used antimony oxides and their hydrates to remove chlorine in the solution.

Method used

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  • Method for adsorbing and removing chlorine from strong acidic solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take H + The sulfuric acid leaching solution of metallurgical materials with a concentration of 1.5mol / L is 1.5m 3 According to the 4.5 times of the theoretical amount of chlorine converted into antimony oxychloride, add the hydrated oxide of trivalent antimony, stir at room temperature for 2.5 hours to perform a dechlorination, and filter to obtain a dechlorination filter residue and a dechlorination liquid. Then add antimony pentoxide according to the conversion of the antimony in the liquid after the first dechlorination to 2.5 times the theoretical amount of tetravalent antimony, stir at 65°C for 3.5h to carry out the second dechlorination, and filter to obtain the second dechlorination filter residue and the second dechlorination after liquid. The resulting liquid after secondary dechlorination contains 0.23g / L Cl and 0.02g / L Sb. The acid in it is firstly separated and recovered by diffusion dialysis, and the recovered acid is returned to prepare the leaching solu...

Embodiment 2

[0043] Take 0.5m of smelting flue gas scrubbing acid 3 According to the 1.5 times of the theoretical amount of chlorine converted into antimony oxychloride, add the hydrated oxide of trivalent antimony, stir at room temperature for 1.5h to perform a dechlorination, and filter to obtain a dechlorination filter residue and a dechlorination liquid. Then add antimony acid according to the conversion of the antimony in the liquid after the primary dechlorination to twice the theoretical amount of tetravalent antimony, stir at 95°C for 1.5h for secondary dechlorination, and filter to obtain the secondary dechlorination filter residue and the secondary dechlorination liquid . The obtained solution after secondary dechlorination contains 0.19g / L Cl and 0.02g / L Sb, and dilute acid solution is obtained after defluorination. The resulting primary dechlorination filter residue is added to water at a solid-to-liquid ratio of 1:4g / mL, and sodium carbonate is added to adjust the pH of the s...

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Abstract

The invention discloses a method for adsorbing and removing chlorine from a strong acidic solution. The method comprises: contacting a chlorine-containing solution with an oxide of trivalent antimonyand a hydrate thereof, carrying out primary adsorption dechlorination, carrying out filtration to obtain a primary dechlorinated liquid and primary dechlorinated filter residues, adding an oxide containing pentavalent antimony and a hydrate thereof into the primary dechlorinated liquid, carrying out secondary dechlorination so that the remaining antimony and chlorine are converted into an oxide ofpentavalent or tetravalent antimony and oxychloride precipitates are precipitated, filtering the precipitates to obtain a secondary dechlorinated liquid and secondary dechlorinated filter residues, wherein the secondary dechlorinated liquid contains less than 0.25g / L of Cl and less than 0.03g / L of Sb, regenerating the dechlorinated filter residues through an alkali liquor and regenerating and recycling the dechlorinated filter residues through an alkali liquor containing an oxidizing agent. The method has the advantages of good dechlorination effects, cleaness, environmental friendliness, economical efficiency and high efficiency and is suitable for industrial application of strong acidic solution dechlorination.

Description

technical field [0001] The invention relates to a method for adsorbing and removing chlorine from strong acid solution, belonging to the fields of metallurgy and chemical industry. Background technique [0002] Chlorine is a non-metallic chemical element with active chemical properties and can combine with most metal elements to form compounds, and most chlorides have good solubility in water. Chlorine-containing acidic solution is corrosive to metal equipment, and the electrolysis of acidic chlorine-containing solution produces chlorine gas, which pollutes the environment. In addition, high-concentration chlorine-containing waste liquid is seriously harmful to the ecological environment. Therefore, it is necessary to remove the chlorine in the wastewater purification process. Commonly used methods for removing chlorine from aqueous solutions include: chemical precipitation, solvent extraction, ion exchange, and adsorption. [0003] The chemical precipitation method is di...

Claims

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Application Information

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IPC IPC(8): B01D15/00B01J20/06B01J20/34C01D3/04
CPCB01D15/00B01J20/06B01J20/3475C01D3/04
Inventor 王学文杜艳苹孟钰麒王明玉王懿
Owner CENT SOUTH UNIV
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