A method for producing zinc powder by electrolytic leaching of alloy zinc ash slurry

A technology of slurry electrolysis and slurry electrolysis cell, which is applied in the field of hydrometallurgy, can solve problems such as low zinc recovery rate, high production cost, and long process flow, and achieve the effects of improving zinc quality, increasing leaching rate, and reducing pollution

Inactive Publication Date: 2019-03-05
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

However, since leaching and electrolysis are not integrated, multiple oxidation leaching is required to recover zinc well, and the leaching solution also needs to be vulcanized and purified independently before it can enter electrolysis; resulting in long process flow, low zinc recovery rate, and production costs. also higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The zinc ash obtained from a hot-dip galvanized dross after being hot-fried with ammonium chloride contains 25.8% zinc, 0.53% aluminum, 0.053% lead, 5.5% iron and 6.3% chloride ion. Wash with 5% sodium carbonate aqueous solution at 80℃ to dechlorinate 91.5%, then use 4mol / L sodium hydroxide solution to adjust the slurry according to liquid / solid=4.5, 50℃, and stir to overflow into the No. 5 electrolytic leaching tank In the first-level tank, the electrolytic leaching is stirred after reaching a certain volume. The fifth-level electrolytic leaching tank is equipped with 4 sets of anode and cathode plates, a total of 5 anodes, 4 cathodes, and the anode is Φ50mm graphite rod assembled into a plate size of 1600╳ 1000╳50mm, the cathode is 316 stainless steel plate, the size is 1600╳1000╳5, and placed in a filter cloth bag, the tank pressure is 3.2V, the current density is 500A / m2, the temperature is 45°C, and the stirring speed is 350 rpm. The elevated slurry electrolyte flow...

Embodiment 2

[0041] Die-cast zinc ash, containing 28.2% zinc, 0.83% aluminum, 0.1% lead, 0.5% iron, 9.3% chloride ion, wash the chlorine with 3% sodium carbonate and use 3.5mol / L sodium hydroxide and 10mol / L TZ- 20 starter agent, according to liquid / solid=4, 50℃ slurry electrolytic leaching in the slurry electrolytic leaching tank of Example 1, tank pressure 4V, current density 750A / m2, temperature 50℃, continuous slurry electrolysis for 56 hours. The slag sample in the level 5 tank was tested for 0.93% zinc. The unpressurized filter continues to return to the mixing tank to participate in the mixing and continuous electrolytic leaching for 100 hours. The fifth-level slag sample contains 0.51% zinc and the leaching solution contains 4.5g / L zinc. The cathode zinc powder in the primary tank contains 84.8% metallic zinc, and the zinc powder obtained from grades 2-5 contains 96.2%, 96.8%, 97.3%, and 98.1%, respectively. The anode mud is small and untreated.

Embodiment 3

[0043] The pure zinc ash obtained by electrolytic zinc flake casting contains 45.2% zinc, 10.5% chlorine, 1% iron, without sodium carbonate to wash the chlorine, directly adjust the slurry with 4mol / L sodium hydroxide solution and then use the slurry electrolytic leaching tank of Example 1 Continuous electrolytic leaching inside, tank pressure 4V, current density 1000A / m2, temperature 50°C, electrolytic leaching for 85 hours, sampling test residue in the 5th tank contains 0.85% zinc, liquid zinc 10.2g / L, and the residue is filtered by pressure It is sent to the rotary kiln for treatment, the liquid is returned to the slurry tank, and all levels of slurry electrolytic leaching tanks all have chlorine escape. The metal zinc powder in the first tank contains 90.5% zinc, and the zinc in the metal zinc powder in the 2-5 tank is 96.7% and 97.1 respectively. %, 97.5%, 98.2%.

[0044] It can be seen from the results of the foregoing Examples 1-3 that the creation of the present invention...

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Abstract

The invention relates to the technical field of hydrometallurgy, in particular to a method for producing zinc powder adopting electrolytic leaching of zinc alloy ash pulp. Zinc alloy ash is used as raw materials; after 90%-95% chloride ions are eluted with sodium carbonate hot water solutions, alkaline pulp is prepared with sodium hydroxide solutions; then, the alkaline pulp is subjected to electrolytic leaching, and the electrolytic leaching adopts integrated continuous production, so that the production process is short, and impurities are continuously electrolyzed and settled in the continuous production process to enter anode sludge, while zinc is electrolyzed from a cathode plate, so that the zinc leaching efficiency is improved greatly and reaches 99% or above; the quality of the zinc powder obtained in an electrolytic bath for secondary electrolysis above is high, and the zinc recovery efficiency is improved; and pollution and the cost are reduced.

Description

Technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for producing zinc powder by electrolytic leaching of alloy zinc ash slurry. Background technique [0002] In addition to 20-30% zinc, alloy zinc ash also contains a small amount of metal impurities such as aluminum, lead, iron, chloride and non-metal impurities. [0003] At present, the comprehensive recovery of zinc mainly uses rotary kiln redox volatile alkali to elute chlorine, and then sulfuric acid leaching purification, electrolysis of metal zinc or evaporative crystallization of zinc sulfate heptahydrate. Due to the incomplete chlorine elution process in the alkali, the sulfuric acid leaching solution still contains a considerable amount of chloride ions. As the production cycle progresses, the chloride ions are enriched in the production system, which harms the production of electrolytic zinc and affects zinc sulfate heptahydrate. the quality of. Moreover, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/20C22B19/30C25C5/02
CPCC22B3/045C22B7/008C22B7/02C22B19/24C22B19/30C25C5/02Y02P10/20
Inventor 李世平韦国龙曾光祥张华卢宇王志斌
Owner 贵州省兴安环保科技有限公司
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