Technology for zinc wet-process clean smelting and resource comprehensive recycling

A wet and clean technology, which is applied in the direction of photographic process, photographic auxiliary process, process efficiency improvement, etc., can solve the problems of reducing investment in zinc hydrometallurgy, shortening process flow of zinc hydrometallurgy, etc., to reduce coke consumption, The effect of reducing emissions

Inactive Publication Date: 2013-03-20
HENAN YUGUANG ZINC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is mainly to carry out innovative research and development on the zinc hydrometallurgy process, and solve the problems of recovery rate of main metals and valuable metals in the zinc hydrometallurgy process, the problem of solid waste treatment and the reduction of sulfur dioxide and carbon dioxide emissions through the innovation of the new process. Problems in production will help to increase the degree of automation and improve the working environment, and at the same time help to shorten the hydrometallurgy process and reduce the investment in hydrometallurgy zinc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A zinc wet method clean smelting and resource comprehensive recycling process, the process includes the following steps:

[0029] Step 1) Roast the zinc concentrate, produce sulfur dioxide flue gas and zinc calcine after roasting, introduce the sulfur dioxide flue gas into the double-rotation and double-absorption sulfuric acid system, and recover the sulfur in the concentrate in the form of concentrated sulfuric acid;

[0030] Step 2), after leaching the zinc calcined sand produced in step 1) through neutral solution and low-acid solution, the electrolytic waste liquid (containing H 2 SO 4 The mass concentration is 160g / L, the mass concentration of zinc is 35g / L) and sulfuric acid for enhanced leaching, that is, by raising the temperature during the leaching process to 85°C, the initial acidity of the reaction is controlled at 150 g / L, and the acidity at the end of the reaction is controlled at 130g / L, the working time is controlled within 3 hours, the liquid-solid ra...

Embodiment 2

[0035] A zinc wet method clean smelting and resource comprehensive recycling process, the process includes the following steps:

[0036] Step 1) Roast the zinc concentrate, produce sulfur dioxide flue gas and zinc calcine after roasting, introduce the sulfur dioxide flue gas into the double-rotation and double-absorption sulfuric acid system, and recover the sulfur in the concentrate in the form of concentrated sulfuric acid;

[0037] Step 2), after leaching the zinc calcined sand produced in step 1) through neutral solution and low-acid solution, the electrolytic waste liquid (containing H 2 SO 4The mass concentration is 180g / L, the mass concentration of zinc is 50g / L) and sulfuric acid for enhanced leaching, that is, by raising the temperature during the leaching process to 90°C, the initial acidity of the reaction is controlled at 200g / L, and the acidity at the end of the reaction is controlled at 160g / L, the working time is controlled at 5 hours, the liquid-solid ratio, ...

Embodiment 3

[0042] A zinc wet method clean smelting and resource comprehensive recycling process, the process includes the following steps:

[0043] Step 1) Roast the zinc concentrate, produce sulfur dioxide flue gas and zinc calcine after roasting, introduce the sulfur dioxide flue gas into the double-rotation and double-absorption sulfuric acid system, and recover the sulfur in the concentrate in the form of concentrated sulfuric acid;

[0044] Step 2), after leaching the zinc calcined sand produced in step 1) through neutral solution and low-acid solution, the electrolytic waste liquid (containing H 2 SO 4 The mass concentration is 195g / L, and the mass concentration of zinc is 70g / L) and sulfuric acid for enhanced leaching, that is, by raising the temperature during the leaching process to 98°C, the initial acidity of the reaction is controlled at 250 g / L, and the acidity at the end of the reaction is controlled at 190 g / L, the working time is controlled within 3 hours, the liquid-sol...

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Abstract

The invention belongs to the technical field of zinc smelting of the nonferrous metal smelting industry, in particular relates to a technology for valuable metal comprehensive recycling and iron element separating and concentrating during a zinc clean smelting process. Zinc calcine which is produced through calcinating zinc concentrate is separated out through neutral leaching and low-acid leaching and is then fed into a wet-process reinforced leaching system to separate acid soluble metals from insoluble substances; the separated zinc and soluble impurity-containing liquid enters a valuable metal separating and concentrating system to separate out indium, gallium, germanium and the like, the separated valuable metal sludge enters a special recycling system; and the liquid enters a zinc and iron separating system to completely separate out zinc and iron, iron is output in a high-grade iron ore concentrate mode, zinc enters the next process in a zinc sulfate mode, and the liquid enters an electrolyzing system after deep purification to output metal zinc. The technology has high metal zinc recovery rate, good valuable metal comprehensive recycling effect, a good environment-friendly effect and high iron content of hematite sludge, the hematite sludge can be treated to be used as a raw material for smelting iron, so that 'non-sludge' smelting is realized, and the smelting process is compact.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting in the nonferrous metal smelting industry, and in particular relates to a process for comprehensively recovering valuable metals and separating and enriching iron elements during the clean smelting process of zinc. Background technique [0002] At present, the comprehensive recovery of valuable metals, the formation and removal of iron, the treatment of iron slag, energy consumption, and environmental protection are the core contents of the hydrometallurgy process, and these factors affect each other. constraints. [0003] At present, there are two schemes of wet zinc and iron removal process in wet smelting: wet method and fire method. The fire method is to add the leaching slag to the rotary kiln or fuming furnace to volatilize into zinc oxide, and then perform zinc oxide leaching; the wet method is All soluble metals and impurities are leached under acidic conditions, and iron and impuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B3/44C22B58/00C22B41/00C25C1/16
CPCY02P10/20
Inventor 倪恒发张新庄翟爱萍张向阳张利涛邓攀王向阳张歌
Owner HENAN YUGUANG ZINC IND
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