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Technology for preparing zinc sulfate from high-chloride zinc slag and coproducing ammonium chloride

A technology of ammonium chloride and zinc sulfate, applied in the direction of zinc sulfate, ammonium halide, improvement of process efficiency, etc., can solve the problems of increasing operating cost, large consumption of sulfuric acid, polluting the environment, etc., to improve leaching rate, improve purity, Achieving zero emissions

Active Publication Date: 2018-01-09
麻江县金泰工业废渣综合利用回收有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: (1) The consumption of sulfuric acid is large due to alkaline washing and then sulfuric acid leaching; (2) The chlorine-containing liquid produced in the process is directly discharged, polluting the environment and wasting resources; (3) Newly added in the process The impurity sodium carbonate waste liquid needs to be treated separately, thus increasing the operating cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] (4) Preparation of ammonium chloride: first adjust the pH value of the chlorine-containing liquid to 4.5-7.5 with hydrochloric acid, then add an ion-masking agent to the solution, and finally undergo vacuum distillation, condensation, and crystallization to obtain ammonium chloride product ; Among them, the ion-masking agent is added 0.5-3 L per cubic meter of chlorine-containing liquid;

[0024] (5) Purification of the zinc dipping solution: add the purified slag produced in step (3) to the zinc dipping solution generated in step (2), and dissolve to obtain a zinc-containing solution, and then use zinc powder as a pH regulator to adjust the zinc content Liquid, adjust the pH value of the zinc-containing liquid to 5.0-6.5, filter to obtain filter residue and zinc-containing purification liquid, then add ion masking agent to the zinc-containing liquid, and finally undergo vacuum distillation, condensation, and crystallization to obtain zinc sulfate products ; Among them,...

Embodiment 1

[0026] Embodiment 1, comprises the following steps:

[0027] (1) Water washing-ammoniation two-stage leaching of chlorine in high-chloride zinc slag: at a water washing temperature of 90°C, add high-chloride zinc slag with an average particle size of 200 μm into the water at a liquid-to-solid weight ratio of 2:1 , after washing with water for 3 hours, filter to obtain washing solution and washing slag, wherein about 85% of chlorine and about 15% of zinc in the high-chloride zinc slag enter the washing solution; Proportion: Add water-washed slag to water, then pass through ammonia gas, adjust the pH value of the reaction system to 9.5, react for 3 hours, and filter to obtain ammonia leaching solution and ammonia leaching residue. Among them, the leaching rate of chlorine is about 89%, and the leaching rate of zinc The rate is 0;

[0028] After the two-stage leaching process of water washing and ammoniation, the leaching rate of chlorine is over 98%, and the leaching rate of zi...

Embodiment 2

[0034] Embodiment 2, comprises the following steps:

[0035] (1) Water washing-ammoniation two-stage leaching of chlorine in high-chloride zinc slag: at a water washing temperature of 20°C, add high-chloride zinc slag with an average particle size of 40 μm to the water at a liquid-to-solid weight ratio of 8:1 , after washing with water for 0.5h, filter to obtain washing solution and washing slag, wherein about 85% of chlorine and about 15% of zinc in the high-chloride zinc slag enter the washing solution; at 20°C, the liquid-solid weight ratio is 8:1 The ratio of washing slag was added to water, and then ammonia gas was introduced, and the pH value of the reaction system was adjusted to 8.5. After reacting for 2 hours, it was filtered to obtain ammonia leaching solution and ammonia leaching residue. Among them, the leaching rate of chlorine was about 89%, and the leaching rate of zinc The leaching rate is 0;

[0036] After the two-stage leaching process of water washing and a...

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Abstract

The invention discloses a technology for preparing zinc sulfate from high-chloride zinc slag and coproducing ammonium chloride. The technology comprises the following steps: (1) leaching chlorine fromthe high-chloride zinc slag through water washing-ammoniating two sections; (2) performing acid leaching on zinc in an ammonium leached residue by using oxidized sulfuric acid; (3) purifying chlorine-containing liquid; (4) preparing the ammonium chloride; (5) purifying zinc leached liquid. By a water washing-ammonium leaching and acid leaching step-by-step separation technology, the technical bottleneck problems during application of the conventional wet-process zinc smelting technology for recycling the zinc from the high-chloride zinc slag and discarding a chlorine resource are solved, so that the technology for recycling the zinc and chlorine from the high-chloride zinc slag is provided, and thus an environment-friendly technology for recycling the zinc and the chlorine at low cost, producing ammonium chloride and zinc sulfate products and ensuring zero discharge of three wastes is achieved; meanwhile, valuable metals lead, cadmium, copper and the like in the high-chloride zinc slag are enriched and recycled.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a comprehensive recovery method for valuable elements in high-chloride zinc slag. Background technique [0002] High-chloride zinc slag is blast furnace soot collected by wet scrubbers, bag filters, electrostatic precipitators, etc. from the soot discharged in the process of non-ferrous and ferrous metallurgy, and is rich in metals such as lead, cadmium, copper, zinc, tin, etc. It also contains non-metallic elements such as silicon, arsenic, chlorine, and fluorine. At present, when recovering valuable elements in smelting soot, only metal elements in smelting soot are considered, and elements such as chlorine and fluorine are directly discharged, causing environmental pollution and high operating costs. [0003] In the publication number CN102534228 "A Method for Comprehensive Recovery of Valuable Elements from High-Arsenic Copper Smelting Soot", th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06C01C1/16C22B7/00
CPCY02P10/20
Inventor 王振杰刘安荣薛革文刘洪波
Owner 麻江县金泰工业废渣综合利用回收有限责任公司
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