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Regeneration process of zinc residue produced in hot zinc plating

A hot-dip galvanizing and new process technology, which is applied in the field of zinc slag regeneration new process, can solve the problems of serious environmental pollution, large waste discharge, high energy consumption, etc., achieve low investment, reduce raw material and energy consumption, and small volume Effect

Inactive Publication Date: 2004-12-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of hot-dip galvanizing slag, whether it is vacuum distillation or electrolysis, energy consumption is relatively high, waste discharge is large, and environmental pollution is serious

Method used

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  • Regeneration process of zinc residue produced in hot zinc plating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (a), get 5000 grams of hot-dip galvanizing slag of Baosteel 2030, its chemical composition is as follows: AL7.1%, Pb0.15%, Fe3.4%, Zn88.5%, Cd0.11%. use NH 4 CI is used as a protective medium, heated to 680°C in a furnace to melt, add 80 grams of aluminum and zinc slag liquid to mix, add ammonium chloride, keep the temperature for 1 hour, slowly cool down to 460°C, and stand still for 15 minutes to obtain a homogeneous The zinc liquid directly flows into the ingot casting device to form a zinc ingot weighing 3,500 grams. Zinc ingot composition analysis: AL (%) 0.30 ~ 0.58, Pb (%) 0.02 ~ 0.10, Fe (%) < 0.01, Cd (%) < 0.01, Zn (%) balance.

Embodiment 2

[0027] (a), with embodiment 1.

[0028] (b), the scum separated by step (a) directly enters the dissolving tank, dissolves in the sulfuric acid solution in the dissolving tank, adopts the goethite method to precipitate and remove iron impurities, and can directly send ironmaking after the precipitation is dried.

[0029] (c), the purified lysate is sent to the electrolytic cell, the cell voltage is 0.66v, and the current intensity is 450A / m2. The cathode is nickel, the anode is lead, and the electrolyte is zinc sulfate-sulfuric acid. After electrolysis, 700 grams of zinc are collected on the cathode, and the purity is greater than 99.5%. After being washed and dried, it is sent to the furnace in step (a). The aluminum in the electrolyte is crystallized by distillation to obtain aluminum sulfate. Pure aluminum can be obtained by molten salt electrolysis.

Embodiment 3

[0031] (a), get 5000 grams of hot-dip galvanizing slag of Baosteel 2030, its chemical composition is as follows: Al6.3%, Pb0.15%, Fe2.3%, Zn91.2%, Cd0.11%. Use NH4CI as a protective medium, heat to 810°C in a furnace to melt, add 55 grams of aluminum and zinc slag liquid to mix, keep the temperature for 1 hour, then slowly cool down to 460°C, and stand still for 15 minutes to obtain a homogeneous zinc liquid at the bottom. The zinc liquid flows directly into the ingot casting device to form a zinc ingot weighing 3800 grams. Zinc ingot composition analysis: AL (%) 0.30 ~ 0.58, Pb (%) 0.02 ~ 0.10, Fe (%) < 0.01, Cd (%) < 0.01, Zn (%) balance. The direct recovery rate of zinc is nearly 80%.

[0032] (b) The scum directly enters the dissolving tank, dissolves in the hydrochloric acid solution in the dissolving tank, adopts goethite precipitation to remove iron impurities, and can be directly sent to ironmaking after the precipitation is dried.

[0033] (c), the purified solution...

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Abstract

The regeneration process of zinc residue produced in hot zinc plating includes adding aluminium for hardening and tempering, heating in smelting furnace to 500-900 deg.c for smelting completely while using protecting medium to isolate air, cooling to 400-500 deg.c after aluminium is mixed with liquid state zinc residue, separating zinc liquid and floating residue with separated zinc amount being over 80%, and eliminating iron in the floating residue inside one dissolving tank and electrolysis to accumulate zinc or electrolyzing floating residue to obtain zinc of purity over 99%. The said process can reduce power consumption, reduce investment and realize zero waste exhaust.

Description

technical field [0001] The invention relates to a new process for regenerating zinc slag, in particular to a new process for regenerating hot-dip galvanized slag. Background technique [0002] The consumption of zinc is increasing, and the direct result is that the production of zinc slag is bound to increase year by year. Under the circumstance that the zinc resource is decreasing year by year and the new demand continues to grow, the research on the regeneration treatment method of zinc slag has been paid more and more attention. Due to the particularity of the composition of zinc slag, various elements mostly exist in a simple state. For hot-dip galvanizing, it is impossible to completely copy the method of smelting zinc from ore in the treatment process. [0003] In this situation, it is necessary to research and develop an efficient zinc slag treatment method. Whether it is a wet process or a pyrotechnic process, the regeneration and purification of zinc slag has been...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B19/30
CPCY02P10/20
Inventor 任玉森李永谦
Owner BAOSHAN IRON & STEEL CO LTD
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