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Method for purifying zinc sulfate electrolyte by using manganese metal powder

A technology of metal manganese powder and zinc sulfate solution, which is applied in the direction of electrolysis process, electrolysis components, and process efficiency improvement, can solve problems such as unsatisfactory use methods, and achieve the effects of small amount of slag, wide application conditions, and reduced dosage.

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

[0006] Although metal manganese 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

[0019] The method for the metal manganese powder to purify the zinc sulfate electrolyte, the steps are as follows:

[0020] Into 1L of zinc sulfate solution to be purified (containing Zn-155g / L, Cu-635mg / L, Cd812mg / L, Co-6.5mg / L, Ni-21mg / L) at 65°C and pH 4.5 1.4g (1.3 times of theoretical consumption) metal manganese powder (-300 mesh, purity 99.9%), after stirring for 50min, filter to obtain the filtrate and slag phase, wherein the filtrate composition meets the requirements of zinc electrodeposition (Cu-0.18mg / L , Cd-1.3mg / L, Co-0.67mg / L, Ni-0.95mg / L), the enrichment of valuable metals in the slag phase is high (Zn-19.68%, Cu-34.44%, Cd-43.74%, Co -0.31%, Ni-1.04%, Mn-0.66%, others 0.13%).

Embodiment 2

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

[0023] In 1L of zinc sulfate solution to be purified at 80°C and pH 5.0 (containing Zn-146g / L, Cu-732mg / L, Cd-649mg / L, Co-18.3mg / L, Ni-12.8mg / L) , add 0.5g for the first time (adding 0.3g added for the second time, always 2.2 times of theoretical consumption) metal manganese powder (-300 mesh, purity is 99.9%), 0.125g CuSO 4 (purity 99.9%) and 0.04gSbSO 4 (purity 95%), after stirring for 40min, filter to obtain filtrate and slag phase, wherein the filtrate composition is (Cu-0.11mg / L, Cd-1.5mg / L, Co-0.72mg / L, Ni-0.08mg / L), The enrichment of valuable metals in the slag phase is high (Zn-37.46%, Cu-21.11%, Cd-17.26%, Co-4.68%, Ni-3.40%, other 16.01%); add 0.3 g metal manganese powder (-300 mesh, purity is 99.9%), after stirring for 30min, filter to obtain filtrate and slag phase, wherein the filtrate components (Cu-0.05mg / L, Cd-0.07mg / L, Co-0.32mg / L, Ni-not det...

Embodiment 3

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

[0026] 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 3.0g (1.94 times of theoretical consumption) metal manganese powder (-100 mesh, purity is 74%, all the other are MnO), after stirring for 70min, filter to obtain filtrate and slag phase, wherein the filtrate composition meets zinc electrodeposition requirements (Cu -0.12mg / L, Cd-0.81mg / L, Co-0.31mg / L, Ni-0.53mg / L), the enrichment of valuable metals in the slag phase is high (Zn-36.84%, Cu-29.17%, Cd -14.57%, Co-0.23%, Ni-0.10%, Mn-17.36%, others 1.72%).

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Abstract

The invention relates to a method for purifying zinc sulfate electrolyte by using manganese metal powder. The method is characterized in that metal manganese powder is used as a main purifying agent, or a copper-containing or antimony-containing substance is added as an auxiliary purifying agent; a certain amount of a purifying agent is added into a zinc sulfate solution to be purified at proper temperature and acidity in a certain atmosphere to be fully mixed and subjected to complete reaction, and then liquid-solid separation is carried out; and the concentration of the zinc sulfate solution which is qualified compared with that of electropositive impurity metal ions, and high-grade leaching residues containing valuable metals such as Cu, Cd, Co and Ni are obtained. According to the method, the technology is simple, the metal manganese 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 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, using metal manganese powder as the main purifying agent, can purify impurity metal ions in zinc sulfate solution to a qualified level, and produce leaching slag with high grade of 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 cause of this ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C22B7/00C25C1/16C25C7/06
CPCC22B3/46C22B7/006C25C1/16C25C7/06Y02P10/20
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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