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Comprehensive Disposal and Utilization Method of Smelting Waste Slag Containing Precious Metals

A precious metal and comprehensive treatment technology, applied in the direction of improving process efficiency, etc., can solve the problems of waste slag generation, high cost consumption, low metal recovery rate, etc., and achieve the effect of high work efficiency and reduced emissions

Active Publication Date: 2019-04-09
永兴鑫裕环保镍业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting point of silicon and aluminum, direct smelting by pyromethods will consume a lot of cost, and the recovery rate of valuable metals is not high, so all enterprises choose to stockpile them and mix them with other materials to continue smelting, but such waste residues will still be produced in the end , cannot be finalized

Method used

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  • Comprehensive Disposal and Utilization Method of Smelting Waste Slag Containing Precious Metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A comprehensive treatment and utilization method for smelting waste residue containing precious metals, the method specifically includes the following steps:

[0028] ①Removal of silicon, copper and aluminum with strong acid: Dissolve the smelting waste residue containing precious metals in hydrochloric acid at a liquid-solid ratio of 8:1, and c(H + ) with a mass concentration of 15%, a dissolution temperature of 70°C, and stirring and dissolving for 3.5 hours to obtain leach residue and leachate;

[0029] ②Separation and recovery of copper and aluminum: A. Precipitating copper: add iron to the above leaching solution, the molar ratio of iron and copper is 1.2︰1, heat to a temperature of 70°C, react for 5 hours, and separate to obtain sponge copper; B. Precipitating aluminum: precipitating After the copper is finished, caustic soda is added to the leaching solution, the pH of the solution is adjusted to 6.5, and aluminum hydroxide is obtained by separation; the waste li...

Embodiment 2

[0035] A comprehensive treatment and utilization method for smelting waste residue containing precious metals, the method specifically includes the following steps:

[0036] ① Removal of silicon, copper and aluminum with strong acid: the smelting waste residue containing precious metals is dissolved in sulfuric acid at a liquid-solid ratio of 4:1, and the c(H + ) with a mass concentration of 40%, a dissolution temperature of 55°C, and stirring and dissolving for 4.5 hours to obtain leaching residue and leaching liquid;

[0037] ②Separation and recovery of copper and aluminum: A. Copper precipitation: Add iron to the above leaching solution, the molar ratio of iron to copper is 1.2︰1, heat to 80°C, react for 3.5 hours, and separate to obtain sponge copper; B. Aluminum precipitation: After the copper precipitation is completed, caustic soda is added to the leaching solution to adjust the pH of the solution to 6.5, and aluminum hydroxide is obtained by separation; the waste liqui...

Embodiment 3

[0043] A comprehensive treatment and utilization method for smelting waste residue containing precious metals, the method specifically includes the following steps:

[0044] ①Silicon, copper and aluminum removal with strong acid: the smelting waste residue containing precious metals is dissolved in sulfuric acid at a liquid-solid ratio of 6:1, and the c(H + ) with a mass concentration of 30%, a dissolution temperature of 65°C, and stirring and dissolving for 4 hours to obtain leach residue and leachate;

[0045] ②Separation and recovery of copper and aluminum: A. Precipitating copper: add iron to the above leaching solution, the molar ratio of iron and copper is 1.2︰1, heat to a temperature of 90°C, react for 3 hours, and separate to obtain sponge copper; B. Precipitating aluminum: precipitating After the copper is finished, caustic soda is added to the leaching solution, the pH of the solution is adjusted to 6.5, and aluminum hydroxide is obtained by separation; the waste liqui...

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Abstract

The invention belongs to the technical field of recycling of wastes, and in particular, discloses a comprehensive treatment and utilization method of precious metal-contained smelting wastes. The method comprises the following specific steps: (1) silicon, copper and aluminum are removed by strong acid to obtain leaching slag and leaching liquid; (2) copper and aluminum are separated and recovered to obtain sponge copper and aluminum hydroxide; (3) the leaching slag is smelted by an arc furnace to obtain precious lead and the smelting slag; (4) rough lead and precious metal are obtained by vacuum separation; (5) gold and silver are obtained by separation and purification; and (6) such construction materials as microcrystals and foam plates are produced by using the smelting slag. The method solves the problem of environmental pollution caused by the waste landfill, and meanwhile, recycles the precious metal. The purpose of removing silicon, copper and aluminum by using the strong acid is to lower the smelting point of materials to 1100-1200 DEG C to create excellent conditions for smooth pyrogenic smelting after wet treatment of such high-melting-point components as silicon and aluminum by using the strong acid; the smelting slag is smelted by the arc furnace, so that the precious metal in the wastes is separated more thoroughly, and the metal recovery rate is increased by 5-8% compared with a blast furnace.

Description

technical field [0001] The invention belongs to the technical field of waste slag recovery and utilization, and in particular relates to a method for comprehensive treatment and utilization of precious metal-containing smelting waste slag. Background technique [0002] With the development of the smelting industry, the types and quantities of smelting waste generated by various enterprises are also increasing. This kind of waste residue mainly contains silicon, aluminum, lead, copper, and also contains a small amount of valuable metals such as gold, silver, platinum, and palladium. Due to the high melting point of silicon and aluminum, direct smelting by pyromethods will consume a lot of cost, and the recovery rate of valuable metals is not high, so all enterprises choose to stockpile them and mix them with other materials to continue smelting, but such waste slag will still be produced in the end , cannot be finalized. With the continuous strengthening of environmental pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B15/00C22B21/00C22B13/02C22B11/00
CPCC22B7/007C22B7/04C22B11/00C22B13/025C22B15/0069C22B15/0071C22B15/0091C22B21/0023Y02P10/20
Inventor 曹喜平卜京丞蔡世兵刘林
Owner 永兴鑫裕环保镍业有限公司
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