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Method for purifying zinc sulfate electrolyte by using metal aluminum powder

A technology of metal aluminum powder and zinc sulfate solution, which is applied in the direction of electrolysis components, electrolysis process, process efficiency improvement, etc., can solve the problems of complex preparation process and unsatisfactory use method of purification agent, and achieve the reduction of dosage and small amount of slag , high enrichment effect

Pending Publication Date: 2021-07-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain effect, but the preparation process of the purifying agent is complicated and cannot avoid the disadvantages of using zinc powder
[0006] Although metal aluminum powder has many advantages as a purifying agent, the current methods of use are not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for the metal aluminum powder to purify the zinc sulfate electrolyte, the steps are as follows:

[0023] Into 1L of zinc sulfate solution to be purified at 73°C and pH 5.0 (containing Zn-148g / L, Cu-635mg / L, Cd812mg / L, Co-6.5mg / L, Ni-21mg / L) at one time 0.35g (1.1 times of theoretical consumption) activated metal aluminum powder (-300 mesh, purity 99.9%, activated in hydrochloric acid solution with pH 2.0 for 5min), stirred for 50min and filtered to obtain filtrate and slag phase, wherein the filtrate component Meet the requirements of zinc electrodeposition (Cu-0.11mg / L, Cd-0.53mg / L, Co-0.32mg / L, Ni-0.59mg / L), high enrichment of valuable metals in the slag phase (Zn-7.2% , Cu-39.55%, Cd-50.75%, Co-0.38%, Ni-1.25%, other 0.87%).

Embodiment 2

[0025] The method for the metal aluminum powder to purify the zinc sulfate electrolyte, the steps are as follows:

[0026] In 1L of zinc sulfate solution to be purified at 50°C and pH 5.0 (containing Zn-146g / L, Cu-820mg / L, Cd-649mg / L, Co-18.3mg / L, Ni-12.8mg / L) , add 0.45g for the first time (in addition to the 0.24g that adds for the second time, always be 2.0 times of theoretical consumption) metal aluminum powder (-300 order, purity is 99.9%, in the sodium hydroxide solution that pH is 11.0 activation 10min), 0.108g CuSO 4 (purity 99.9%) and 0.05g SbSO 4 (purity 95%), filter after stirring 20min and obtain primary filtrate and primary slag phase; Add 0.24g activation metal aluminum powder (same as first time) in the primary filtrate of 38 ℃ again, filter after stirring 10min and obtain secondary filtrate and Secondary slag phase, in which the composition of secondary filtrate is (Cu-0.12mg / L, Cd-0.28mg / L, Co-0.25mg / L, Ni-0.05mg / L), valuable metals are enriched in the prima...

Embodiment 3

[0028] The method for the metal aluminum powder to purify the zinc sulfate electrolyte, the steps are as follows:

[0029] In 1L zinc sulfate solution to be purified (containing Zn-138g / L, Cu-1020mg / L, Cd510mg / L, Co-8.5mg / L, Ni-3.9mg / L) at 85°C and pH 3.5 Add 0.636g (1.06 times of theoretical consumption) activated metal aluminum powder (-100 mesh, purity 62%, the rest is impurity Si, activated in a sodium hydroxide solution with a pH of 11.0 for 10 minutes), stirred for 70 minutes and filtered to obtain Filtrate and slag phase, in which the filtrate composition meets the requirements of zinc electrodeposition (Cu-0.15mg / L, Cd-0.74mg / L, Co-0.41mg / L, Ni-0.63mg / L), and the slag phase is rich in valuable metals High concentration (Zn-6.09%, Cu-53.73%, Cd-0.43%, Co-0.43%, Ni-0.17%, other 12.73%).

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Abstract

The invention relates to a method for purifying zinc sulfate electrolyte by using metal aluminum powder. The method is characterized in that metal aluminum powder is used as a main purifying agent, or a copper-containing or antimony-containing substance is added as an auxiliary purifying agent; firstly, the aluminum powder is activated in an acidic or alkaline solution with a certain pH value; a proper amount of the purifying agent is added into a zinc sulfate solution to be purified with certain acidity and temperature to be fully mixed and subjected to complete reaction in a certain atmosphere, and liquid-solid separation is carried out; and the zinc electrolyte with qualified impurity metal ions and high-grade leaching residues containing valuable metals such as Ni, Co, Cu and Cd are obtained. According to the method, the technology is simple, the metal aluminum powder with the potential more negative than that of a zinc powder (traditional purifying agent) standard electrode is used as the purifying agent, the purifying technological process can be shortened, the using amount of the purifying agent is greatly reduced, and the slag phase where impurity valuable metal is easy to recover is produced.

Description

technical field [0001] The invention relates to the field of purification of leaching liquid in hydrometallurgy. Metal aluminum powder is used as a purifying agent to purify impurity metal ions in a zinc sulfate solution to a qualified level, and produce leaching slag which is easy to recover impurity and valuable metals. Background technique [0002] In zinc smelting enterprises, impurity metal ions (Cu 2+ 、Cd 2+ 、Co 2+ 、Ni 2+ , Sb 2+ 、 Ge 2+ ) concentration is too high, which has a great negative impact on the economic and technical indicators of zinc electrodeposition and the quality of zinc electrodeposition. [0003] At present, the purification of these impurity ions mainly adopts the zinc powder replacement method, but the amount of zinc powder used is usually 6-10 times the theoretical amount, and the obtained slag phase has high zinc content and a large amount of slag, and Cu, Cd, Co, Ni, etc. are valuable. The enrichment of metals is not enough. The root cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/46C25C1/16C25C7/06
CPCC22B19/26C22B3/46C25C1/16C25C7/06Y02P10/20
Inventor 叶乾旭张明倩蔡金明荆煜涵李婷
Owner KUNMING UNIV OF SCI & TECH
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