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Production of metal zinc powder from zinc dust and zinc dross

A technology for metal zinc and zinc scum, which is applied in the field of solid waste recycling, can solve the problems of unapplied production, shortened anode life, and has not been popularized, and achieves good environmental and social benefits, simple equipment and low price. Effect

Active Publication Date: 2006-08-16
昆明同越科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the zinc scum contains 0.5-2% chlorine, if the zinc is directly smelted, the impurity chlorine will corrode the anode plate, shorten the life of the anode and reduce the quality of the precipitated zinc, and because of the difficulty of dechlorination, the zinc scum has not been able to Be well handled, resulting in a waste of resources
At present, there are the following ways to deal with zinc scum: ① Most enterprises sell zinc scum as a by-product at a low price; ② Some enterprises treat zinc scum with hydrochloric acid and produce zinc chloride for sale; ③ Pyrochemical treatment of zinc scum , but it has not been promoted due to the corrosion of the equipment by the enriched chlorine gas; ④ Many scholars have carried out research on the dechlorination of zinc scum and the preparation of zinc oxide from zinc scum, but these are only on a laboratory scale and have not been applied to actual production

Method used

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  • Production of metal zinc powder from zinc dust and zinc dross

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] See attached figure 1 . Using the electric furnace dust of a steelmaking plant as raw material, its chemical composition is shown in Table 1.

[0020] Ingredients

[0021] Put 1t zinc dust into 3-3.5m 3Industrial caustic soda solution, the leaching temperature is controlled at 10-95℃, the concentration of the industrial caustic soda solution is 200-400g / L, and the reaction is carried out for 90 minutes under slow stirring conditions of 120 revolutions / min. Since most metals cannot be dissolved in strong alkaline solutions, the iron, manganese, copper, calcium and other metals in the zinc dust will be precipitated in the filter residue in the form of hydroxides. The filtrate contains only zinc, lead and a small amount of aluminum. The extraction rates of zinc and lead in zinc powder are 95% and 94%, respectively. Filter, wash the filter residue with water, and retain the washing water. A separating agent is added to the filtrate. The separating agent is sodium sulf...

Embodiment 2

[0023] Using zinc scum from a zinc smelter as raw material, its chemical composition is as follows:

[0024] Ingredients

[0025] In zinc dross, zinc is mainly ZnO, and zinc is also ZnS, (CuZn) 5 (SO 4 ) 2 (OH) 6 ·6HO, ZnSO 4 ·2.5H 2 O, Zn 5 (OH) 8 Cl 2 ·2H 2 The formation of O and other compounds exists, and they are all easily soluble in strong alkali solutions. The chlorine in the zinc dross exists in the form of NaCl after alkaline leaching, which is very stable and will not corrode equipment and electrode plates. Crush the zinc dross to 0.5-1mm. Then, leaching with sodium hydroxide solution: 1 ton of zinc scum is immersed in 10 cubic meters of sodium hydroxide solution, and the leaching is stably controlled at 10-95°C, the concentration of sodium hydroxide solution is 350g / L, and the rate is 120 revolutions. After 100 minutes of reaction under slow stirring conditions of / min, the extraction rates of zinc and lead are both 100%. Filter while hot, wash the filter res...

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Abstract

A process for preparing Zn powder from the Zn dust generated by iron and steel factory and the floating Zn slag generated by Zn refinery includes such steps as breaking, extracting in strong alkaline solution while stirring, filtering, washing its dreg and using it to make bricks, adding separating agent to filtrate, stirring, filtering to obtain Pb dreg, electrolyzing the filtrate to obtain Zn powder from cathode, adding alkali to residual liquid to obtain deposit, filtering, adding said dreg-washing water and impurity-removing agent, stirring, filtering, and collecting the filtrate for reuse in said extracting.

Description

Technical field [0001] The invention relates to a process for producing metal zinc powder by using zinc dust and zinc dross. The method uses zinc dust from a steel plant and zinc dross from a hydro-zinc smelting plant as raw materials to produce metal zinc powder, and belongs to the field of solid waste recycling. Background technique [0002] Metal zinc powder is an important industrial raw material, mainly used in metallurgy, chemical, pharmaceutical, battery and other industries, of which the largest amount is in the coating industry. In the cold galvanizing industry, the zinc content in zinc-rich coatings is 40-70% of the total weight of the coating. It is widely used for surface corrosion protection of metal materials in seawater, freshwater and atmospheric media, such as ships, containers, chemicals, and water conservancy. The metal surfaces in the project, such as metal components, automobiles, motorcycles, bicycles, petroleum pipelines, open-air s...

Claims

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Application Information

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IPC IPC(8): B22F9/16
Inventor 赵由才刘清易天晟
Owner 昆明同越科技开发有限公司
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