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A kind of comprehensive recovery method containing zinc chloride solution

The technology of a zinc chloride solution and a recovery method is applied in the field of comprehensive recovery of zinc chloride-containing solutions, which can solve the problems of low recovery rate, high cost, low purity of crystalline products, etc., and achieves improved quality and recovery rate, reduced concentration and The effect of low cost and environmental protection cost

Inactive Publication Date: 2019-05-14
贵州省兴安环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of precipitated slag obtained by this process is large, and the grade of valuable components is low, so it cannot be used alone as a raw material, while the crystallization product has low purity and little economic value
There are also people who use saponification P204 to extract zinc from zinc chloride solution, back-extract zinc sulfate with sulfuric acid, and return to the production system to produce electrolytic or zinc sulfate heptahydrate. It is well known that P204 extracts zinc and requires the zinc content of the solution to be below 30g / L. Only about 50%, the recovery of zinc is scattered, the recovery rate is low, and the treatment process of high chlorine-containing raffinate is complicated, the cost is high, the output is low, and the economic value of sodium chloride or calcium chloride is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An enterprise adopts P 2 0 4 The technological process of extracting indium from sulfuric acid leaching solution, back-extracting indium with 8N hydrochloric acid, and replacing sponge indium with self-produced zinc flakes. The resulting replacement solution contains 100-300 mg / L of indium, 20-50 mg / L of gallium, and 80-100 mg / L of bismuth , antimony 20-300mg / L, iron 500-1000mg / L, chlorine 125g / L, zinc 38g / L, pH 1.5-2.

[0019] First neutralize with sodium carbonate to PH = 4.8, add 5% hydrogen peroxide at the same time, filter the hydrolyzed precipitate, the filtrate contains indium < 1mg / L, gallium < 0.5mg / L, bismuth < 10mg / L, antimony < 2mg / L , iron is 50-60mg / L, chlorine and zinc loss is 0.8-1%, and then 4-stage extraction is carried out with 30% N235 and 70% kerosene extractant, the extraction raffinate contains zinc 5.2g / L, chlorine 23g / L , the loaded organic phase is back-extracted with 35% sodium hydroxide solution at normal temperature in 3 stages, the primar...

Embodiment 2

[0021] After replacing the liquid with the indium of Example 1, add 10% hydrogen peroxide to oxidize it, and then neutralize it with sodium carbonate to PH=5. After filtering, the filtrate contains a small amount of indium, bismuth <1 mg / L, and antimony <0.5 mg / L. Iron﹤10.5mg / L, then use 40% N235 and 60% kerosene extractant for 5-stage extraction, the raffinate contains 1.5g / L zinc and 12.3g / L chlorine. The loaded organic phase is carried out with 40% sodium hydroxide for 4-stage stripping at room temperature. The primary stripping solution contains 36.5g / L zinc, 115.2g / L chlorine, and 165.5g / L sodium hydroxide. In an external magnetic field H=50A / m Carry out electrolysis under condition, electrolysis condition is the same as embodiment 1, zinc current efficiency 58.3%, electrolytic zinc powder grade contains metal zinc 98.5%, raffinate contains zinc 10.5g / L, chlorine 21.5g / L, sodium hydroxide 215g / L , power consumption 3800kWh / ton of zinc.

Embodiment 3

[0023] After a certain indium was replaced, the liquid contained 45.5g / L of zinc, 135g / L of chlorine, 250mg / L of indium, 1.2g / L of iron, and pH=1.5. The electrolytic raffinate of Example 2 was used for neutralization and hydrolysis, and 10% hydrogen peroxide was added at the same time , neutralized to PH=4.8, and the filtered filtrate contained 0.5mg / L indium, 8.5mg / L iron, 52.3g / L zinc, and 151.5g / L chlorine. Then carry out N235 extraction by the condition of example two, carry out stripping with the electrolytic raffinate of example two, the one-level stripping liquid contains zinc 58.1g / L, chlorine 135g / L, sodium hydroxide 182.5g / L, according to example two Under the condition of electrolysis, the obtained cathode metal zinc powder contains 99.3% zinc. Among them, the metal zinc is 98.95%, the chlorine gas released from the anode is not collected and measured, the electrolytic raffinate contains 13.5g / L zinc, 25.3g / L chlorine, 225g / L sodium hydroxide, and the power consumpt...

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Abstract

The invention discloses a comprehensive recovery method for solution containing zinc chloride, and relates to the technical field of hydrometallurgy. According to the invention, ZnCl4<2-> and chloridion are directly extracted under the condition of PH of 3 to 5 by adopting a N235-kerosene extraction agent, then an organic phase loaded with zinc and chlorine is reversely extracted by using 30 to 40% of sodium hydroxide, the obtained alkali reverse-phase extraction liquor is subjected to chlorine salt electrolysis, metal zinc powder is obtained in a cathode region, chlorine gas is obtained in ananode region, and residual electrolysis liquor is regenerative sodium hydroxide, so that comprehensive high-efficiency recovery of zinc, chlorine and sodium hydroxide in the solution containing zincchloride is implemented. According to the invention, the process flow is short; higher separation and recovery of all of chlorine, zinc, indium, gallium, bismuth, antimony, sodium carbonate and sodiumhydroxide are obtained, wherein a recovery rate of zinc in zinc powder reaches 95% or more; the comprehensive recovery method is low in production cost and high in economic value of the product, generates few waste residues and little wastewater, is low in environmental-friendly treatment cost and implements economic benefit maximization.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a comprehensive recovery method for a solution containing zinc chloride. Background technique [0002] Metal zinc flakes or zinc ingots, zinc plates, and zinc powder are used to replace indium and gallium in the hydrochloric acid stripping solution containing indium or gallium. The replaced solution generally contains a small amount of indium chloride, gallium chloride, antimony chloride, and chloride Bismuth contains a large amount of zinc chloride, the total amount of chloride ions is above 100g / L, and the pH is generally 1-2. [0003] The traditional treatment method is to return to the production system and recover the valuable components. Due to the large amount of chlorine ions, they will be enriched and endanger production after repeated returns. In order to remove chlorine, methods such as copper slag dechlorination, silver dechlorination, and ion exchange dechlo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B58/00C22B30/06C22B30/02C25C5/02
CPCC22B7/00C22B30/02C22B30/06C22B58/00C25C5/02Y02P10/20
Inventor 李世平卢宇王志斌韦国龙
Owner 贵州省兴安环保科技有限公司
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