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Zinc hydrometallurgy process adopting chloride system

A technology for hydrometallurgy of zinc and chloride, which is applied in the direction of photography technology, photography auxiliary technology, process efficiency improvement, etc., can solve the problems of low chloride ion tolerance, easy decomposition, low solubility, etc., and achieve good economic benefits and Market prospect, easy large-scale production, and simple process route

Pending Publication Date: 2021-11-02
BAIYIN YUANDIAN TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But through practice inspection, it itself has certain defects: 1. In this system, what used during electrolysis is lead alloy anode, and this anode has low tolerance to chloride ions, and when there is a certain concentration of chloride ions in the system, it will The service life is severely shortened due to corrosion; 2. The system must rely on potassium permanganate, hydrogen peroxide, etc. as oxidants for iron removal operations, of which potassium permanganate is relatively expensive, and as the third type of precursor chemicals, the control is stricter , the cost of purchasing and storage management is high, and the price of hydrogen peroxide is low, but it is easy to decompose and the oxidation efficiency is low; 3. The current efficiency is low, the tank voltage is high, and the burning board failure is prone to occur
However, it has been found through practical inspection that it has the following defects: 1. Zn(NH 3 ) 2 Cl 2 The solubility is low, it is difficult to prepare a high-concentration solution, and the cost of power consumption is high; 2. Zn(NH 3 ) 2 Cl 2 Solubility varies greatly with temperature. When the temperature drops, a large amount of crystallization will precipitate, causing pipeline blockage and other failures; 3. Ammonia is consumed during electrolysis, and liquid ammonia or ammonia water must be replenished quantitatively, which is costly; 4. There is an upper limit on the tolerance of chlorine ; 5. If the raw material contains potassium and sodium ions, it will be enriched in the liquid and reduce the concentration of ammonium ions, which will lead to a decrease in the leaching rate

Method used

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  • Zinc hydrometallurgy process adopting chloride system
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  • Zinc hydrometallurgy process adopting chloride system

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Experimental program
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Embodiment

[0056] Therefore, in view of the defects of the above-mentioned method, the present invention provides a kind of hydrometallurgy process of chloride system, the flow process of this process is as follows figure 1 , the reaction process can be briefly expressed as:

[0057] Zinc oxide leaching: Cl 2 +H 2 O=HCl+HClO

[0058] 2HClO=2HCl+O 2 (Decomposition of hypochlorous acid by light or catalyst)

[0059] 2HCl+ZnO=ZnCl 2 +H 2 o

[0060] Zinc sulfide leaching: ZnS+Cl 2 =ZnCl 2 +S

[0061] Electrolysis: ZnCl 2 =Zn+Cl 2

[0062] This process uses the chlorine gas produced by the anode during electrolysis to leach zinc oxide and zinc sulfide raw materials, and obtain an aqueous solution with zinc chloride as the main component after leaching. Purify the aqueous solution to remove impurities such as lead, copper, indium, etc. to obtain zinc chloride electrolyte. Pump the electrolyte solution into the electrolytic cell, turn on the electricity for electrolysis, the chlor...

Embodiment 1

[0089] The zinc-containing raw material is recycled zinc raw material, and the recycled zinc raw material is ground to a fineness of 200-400 mesh, and the test data are as follows:

[0090] Zn Cl S Fe Cu Pb Cd 51.7% 12.2% 0.13% 5.2% 0.04% 3.7% 0.29%

[0091] Zn Cl Fe Cu Pb+Cd K+Na pH 29g / L 116g / L 3.88mg / L - 2.2mg / L 77.3g / L 4.8

[0092] In addition, the composition data of electrolytic waste liquid are as follows:

[0093] Take 3.5Kg of the above-mentioned solid powder raw material, mix it with 14L electrolytic waste liquid, stir it into a uniform slurry, pump it into a packed absorption tower with a special structure at a speed of 2.5L / min, and feed chlorine gas (containing air , chlorine purity ≈55%), and the feeding rate is about 10L / min. For the specific structure of the packed absorption tower and the specific implementation process of chlorine feeding, please refer to the Chinese invention patent "...

Embodiment 2

[0109] The zinc-containing raw material is zinc sulfide raw material, and the zinc sulfide raw material is ground to a fineness of 200-400 mesh, and the test data are as follows:

[0110] element S Zn Pb Cu Si Fe content% 26.2 50.8 2.06 0.017 4.7 5.8

[0111] Zn Cl Fe Cu Pb+Cd K+Na pH 31g / L 133.7g / L 10.5mg / L - 0.8mg / L 86.6g / L 5.4

[0112] In addition, the composition data of electrolytic waste liquid are as follows:

[0113] Take 3.5Kg of the above-mentioned solid powder raw material, mix it with 17L electrolytic waste liquid, stir it into a uniform slurry, pump it into the packed absorption tower at a speed of 2.5L / min, and feed chlorine gas (containing air, chlorine gas purity ≈55 %), the feed rate is about 10L / min.

[0114] During the aeration process, check the pH of the liquid every half hour, and keep the pH of the liquid between 3.5 and 5.0 by adding sodium hydroxide or hydrochloric acid solut...

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Abstract

The invention discloses a zinc hydrometallurgy process adopting a chloride system, and belongs to the technical field of hydrometallurgy. The zinc hydrometallurgy process adopting the chloride system comprises the following steps of leaching zinc oxide and zinc sulfide raw materials by taking chlorine as a leaching agent, and obtaining an aqueous solution taking zinc chloride as a main component after leaching; removing impurities such as lead, copper and indium in the aqueous solution to obtain a zinc chloride electrolyte; pumping the electrolyte into an electrolytic bath for electrolysis; conveying gas separated out from an anode to a leaching procedure in a centralized mode through a pipeline, and leaching raw materials; and separating metal zinc out from a cathode, and stripping off the metal zinc from the surface of the cathode to obtain a product zinc plate. According to the zinc hydrometallurgy process adopting the chloride system provided by the invention, the chloride system is completely used in the whole circulation process, the chlorine serves as the leaching agent to leach zinc-containing materials, electrolysis can be conducted under the neutral-weak acid condition, the electrolysis period is long, the process route is simple, the trouble of faults such as crystallization separation is avoided, the product yield is high, the material source is wide, and good economic benefits and market prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a chloride system hydrometallurgy process for zinc smelting. Background technique [0002] Zinc hydrometallurgy is the hydrometallurgy process of zinc, also known as electrolytic zinc. At present, the traditional electrolytic zinc production is carried out under the sulfuric acid-sulfate system. This process uses sulfuric acid as a leaching agent to leach zinc oxide raw materials. After the leaching solution is purified and removed, it is mixed with a certain concentration of sulfuric acid to form an electrolyte, and finally electrolyzed in the electrolytic cell to obtain zinc skin or zinc plate at the cathode. This process has been in shape for decades and has been continuously explored and perfected in production. It has become the mainstream process of hydrometallurgy. But through practice inspection, it itself has certain defects: 1. In this system, wha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C25C1/16
CPCC22B19/20C25C1/16Y02P10/20
Inventor 申鸿志
Owner BAIYIN YUANDIAN TECHNOLOGY CO LTD
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