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Method for production of zinc ingots with zero discharge of waste slag by hot dip galvanizing slag wet type smelting

A technology of hot-dip galvanizing slag and wet smelting, which is applied to the improvement of process efficiency, photography technology, instruments, etc. It can solve the problems of removing negative effects, low production technology and equipment level, increasing social costs, etc., and achieve economic benefits Significant, operable, no environmental pollution effect

Inactive Publication Date: 2015-07-29
GUIZHOU INST OF METALLURGY & CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 1. The level of production technology and equipment is low, and environmental protection measures are not in place
[0004] At present, there are only a handful of enterprises engaged in the production of recycled zinc in my country, and the level of technology and equipment is generally not high. Some family workshop enterprises even sacrifice the environment and increase social costs to win corporate interests.
[0005] 2. Raw materials for secondary zinc industry are not guaranteed
[0006] The problem of raw materials is the main problem faced by the secondary zinc industry. Since zinc is the largest consumption in the field of steel galvanizing, the zinc-manganese battery industry also uses zinc. The average proportion of total consumption is about 20%. All zinc-manganese batteries consumed are not recycled centrally, and zinc used in the chemical industry cannot be effectively recycled.
[0007] 3. Lack of due attention to secondary zinc industry in industrial production
Conventional hydrometallurgy is inconvenient to process raw materials with a large particle size range, and the elemental zinc in zinc slag has a negative effect on the removal of impurities by conventional smelting methods

Method used

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  • Method for production of zinc ingots with zero discharge of waste slag by hot dip galvanizing slag wet type smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Raw material treatment process: the collected hot-dip galvanizing slag is ground by a ball mill, and then the iron in the zinc material is screened out by mechanical magnetic separation to remove iron, and used as scrap iron; the ground zinc material passes through a 40-60 mesh screen Screening and filtering, the galvanized slag that has not passed the screen is used as a coarse material to be cast into a coarse zinc ingot product; some zinc oxide ash will be produced when the coarse ingot is cast, and the zinc oxide ash is mixed with the fine material to enter the primary leaching process;

[0047] 2). One-time leaching process: Add electrolyte waste to the material (zinc oxide ash, fine material under 60 mesh sieve) that enters this process in step 1). The liquid-solid mass ratio of the material to the electrolyte waste is 1.0:5.5-8.0, and the temperature is controlled. Stir and mix for 90-120 minutes at 60-80°C to leach zinc and iron in the material. The leached zinc...

Embodiment 2

[0056] The other method steps of this embodiment are the same as those of embodiment 1, and the difference is that: step 2) the liquid-to-solid mass ratio of the material in the primary leaching process to the electrolytic waste liquid is 1.0-5.0, and the stirring and mixing time is 90 minutes, The stirring and mixing temperature is: 60℃; Step 3) The electrolytic waste liquid or sulfuric acid added to the zinc slag in the secondary leaching process is subjected to secondary reaction leaching, the leaching time is 120 minutes, and the reaction temperature is 60℃; Step 4) Oxidation removal The slurry in the iron process is neutralized by adding zinc oxide to the slurry. The reaction time is 120 minutes and the reaction temperature is 65°C. In this example, from the treatment of hot-dip galvanizing slag to the production of finished zinc ingots, there is no waste residue or waste water discharge in the whole process. , No environmental pollution, remarkable economic effect.

Embodiment 3

[0058] The other method steps of this embodiment are the same as those of embodiment 1, but the difference is that step 2) The liquid-solid mass ratio of the material in the primary leaching process to the electrolytic waste liquid is 1.0-6.5, and the stirring and mixing time is 100 minutes. The temperature is 70°C; Step 3) The electrolytic waste liquid or sulfuric acid added to the zinc slag in the secondary leaching process is subjected to a secondary reaction leaching, the leaching time is 140 minutes, and the reaction temperature is 70°C; Step 4) In the oxidation iron removal process Zinc oxide is added to the slurry for neutralization reaction. The reaction time is 140 minutes and the reaction temperature is 65°C. In this example, from the treatment of hot-dip galvanizing slag to the production of finished zinc ingots, there is no waste residue, waste water discharge, and no environmental pollution. , The economic effect is remarkable.

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Abstract

The invention provides a method for harmless production of zinc ingots by hot dip galvanizing slag wet type smelting. The method comprises the following steps of screening and iron removal on the collected hot dip galvanizing slag; primary leaching, secondary leaching, oxidizing and iron removal, washing, electrolysis, smelting and casting, and the like on the raw materials. The method has the advantages that the waste slag and the wastewater are not discharged in the process of collecting of the raw materials to the production of a finished product, so the zero pollution on the environment is well realized; the zinc content of the finished zinc ingot is greater than or equal to 99.99%, the iron content of byproduct iron slag is high, and the washing agent can be repeatedly recycled in the production process; the production cost is low, the operation is simple, the implementing is easy, and the energy-saving, low-carbon and environment-friendly effects are realized.

Description

Technical field [0001] The invention relates to the field of hydrometallurgy in non-ferrous metal metallurgy, in particular to a method for producing zinc ingot waste slag with zero discharge from hot-dip galvanizing slag hydrometallurgy. Background technique [0002] At present, my country's secondary zinc industry has the following shortcomings: [0003] 1. The level of production technology and equipment is low, and environmental protection measures are not in place [0004] At present, there are only a handful of enterprises engaged in the production of secondary zinc in my country, and the level of process technology and equipment is generally low. Some family-style workshop enterprises even sacrifice the environment and increase social costs to win corporate interests. [0005] 2. There is no guarantee for the raw materials of recycled zinc industry [0006] The problem of raw materials is the main problem faced by the secondary zinc industry. Since zinc is the largest consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B19/30C25C1/16
CPCY02P10/20
Inventor 孙位成刘洪波
Owner GUIZHOU INST OF METALLURGY & CHEM ENG
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