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Chloride-containing solution treatment method

A technology of sodium chloride solution and chloride, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low efficiency, high energy consumption of evaporation and concentration, and achieve good dechlorination effect

Inactive Publication Date: 2019-04-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, evaporative concentration is almost the only way to separate and recover sodium chloride from aqueous solution, for example, drying salt in seawater and boiling salt in brine, but evaporative concentration has defects such as high energy consumption and low efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take CaCl 2 3m of saponified liquid extracted from rare earth chloride with a concentration of 121g / L 3 , Add anhydrous sodium sulfate according to 1.0 times the theoretical amount of calcium chloride converted into sodium chloride, stir at 65°C for 3.5 hours to precipitate out the calcium in the form of gypsum, and filter to obtain a NaCl solution with a concentration of 115.3g / L and Gypsum filter cake, and then pass HCl gas into the resulting NaCl solution to increase the concentration of hydrochloric acid to 29%, and filter to obtain a hydrochloric acid solution containing NaCl and NaCl crystals with a purity of 99.68%. The mass percent concentration of the hydrochloric acid solution is 29. %, the content of NaCl is 3.5g / L; the recovery rate of chlorine in the process is 97.83%, and the obtained hydrochloric acid solution is returned to be used as the leachate of rare earth minerals.

Embodiment 2

[0027] Take 500g of ferrous chloride crystals obtained during the production of artificial rutile, add water to dissolve to obtain Cl - Ferrous chloride solution with ion concentration of 213.8g / L, then add sodium carbonate according to the theoretical amount to precipitate the iron in the form of ferrous carbonate, and filter to obtain ferrous carbonate filter cake and sodium chloride solution to obtain chlorine Heat up the sodium chloride solution, add 500g ferrous chloride crystals again, stir at 85°C for 0.5h, and filter to obtain a ferrous chloride solution containing NaCl and NaCl crystals with a purity of 99.51%. The content of NaCl in the ferrous chloride solution is 5.7 g / L; continue to add sodium carbonate to the ferrous chloride solution obtained, stir and filter to obtain ferrous carbonate filter cake and sodium chloride solution, so that the ferrous chloride crystals and the sodium carbonate solid are completely converted into ferrous carbonate Filter cake and sodiu...

Embodiment 3

[0029] Take 3L of the precipitation solution of rare earth carbonate containing 128g / L of NaCl, stir and add 36% concentrated hydrochloric acid at room temperature, and use the common ion effect produced by chloride ions to promote the crystallization of sodium chloride. After standing for 2h, filter to obtain NaCl. The hydrochloric acid solution and NaCl crystals with a purity of 99.72%, the molar concentration of the hydrochloric acid solution is 6mol / L, and the content of NaCl is 31.5g / L; the resulting hydrochloric acid solution is returned to continue to be used as the back-extraction liquid for loading the organic phase, and the cycle The recovery rate of chlorine in the process is ~100%.

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PUM

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Abstract

Disclosed is a chloride-containing solution treatment method. The chloride-containing solution treatment method comprises adding sodium-containing agent into chloride solution as converting agent to convert the chloride solution into sodium chloride-containing solution, then adding in chlorine-containing agent of sodium-containing agent as promoter to promote sodium chloride crystallization and separation, and through common ion effects produced by chlorine ions or sodium ions, promoting crystallization and separation of contained chlorine in form of sodium chloride, thereby being capable of separating the chlorine in the solution without evaporation and concentration. The chloride-containing solution treatment method has the advantages of being good in dechlorinating effects, clean, environmentally friendly, economical, high in efficiency and the like and is applicable to industrial application to chloride sewage treatment.

Description

Technical field [0001] The invention belongs to the field of metallurgy and chemical engineering, and specifically relates to a treatment method for a chloride-containing solution. Background technique [0002] Chloride solution is a common salty waste liquid in metallurgy and chemical industries. The solubility of chlorides, especially inorganic metal chlorides, is relatively large. For example, the solubility of magnesium chloride, ferrous chloride, and calcium chloride at room temperature is greater than 500g / L. Although there are no specific discharge standards for metal chlorides, the direct discharge of high-concentration metal chloride waste liquids will seriously harm the ecological environment. The treatment of chloride-containing solutions has become a problem facing the metallurgical and chemical industries. [0003] The common methods for removing metal chlorides from the solution are evaporation crystallization or freezing crystallization. However, the evaporation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F101/12
CPCC02F1/58C02F2101/12
Inventor 王学文孟钰麒王懿王明玉杜艳苹
Owner CENT SOUTH UNIV
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