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A method for efficiently decomposing and recovering valuable metals in copper slag

A valuable metal and copper recovery technology is applied in the treatment of copper slag, efficiently decomposes and recovers valuable metals in copper slag, and can solve the problems of lack of environmental friendliness, separation effect, and ineffective recycling of iron resources in slag, etc. To achieve the effect of improving decomposition efficiency, conducive to popularization and application, and improving the utilization of secondary resources

Active Publication Date: 2020-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the current recycling of iron resources in copper slag lacks an environmentally friendly and high-separation method, which prevents effective recycling of iron resources in slag. This is a difficult problem to be solved in the field of metallurgy and the environment, and an urgent need An energy-saving, high-efficiency, and short-flow process method for recovering associated iron resources in copper slag

Method used

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  • A method for efficiently decomposing and recovering valuable metals in copper slag
  • A method for efficiently decomposing and recovering valuable metals in copper slag
  • A method for efficiently decomposing and recovering valuable metals in copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh the samples of sodium fluoroaluminate and copper slag at a mass ratio of 1:1, put them into a star-shaped ball mill, the ball milling time is 2h, the speed is 400r / min, and the ball milling mixture is put into the atmosphere tube furnace. Air is blown in by a blower, high-temperature solid-phase reaction is carried out at 1050℃ for 60min, and then shaken after cooling. As for stirring and dissolving in hot water at 60℃ for 100min, and then magnetic separation, the product obtained is magnetite and copper slag. The rate is 90%, and the recovery rate of iron in the slag is 96%.

Embodiment 2

[0025] Weigh the samples of sodium fluoroaluminate and copper slag according to the mass ratio of 4:1, put them into the star ball mill, the ball milling time is 2h, the speed is 400r / min, and the ball milling mixture is put into the atmosphere tube furnace. Air is blown in by a blower, high-temperature solid-phase reaction is carried out at 1010℃ for 10min, and then vibrated after cooling, until it is stirred and dissolved in hot water at 60℃ for 100min, and then separated by magnetic separation. The resulting product is magnetite and copper slag. The rate is 86%, and the recovery rate of iron in the slag is 89.3%.

Embodiment 3

[0027] Weigh the samples of sodium fluoroaluminate and copper slag according to the mass ratio of 3:1, put them into the star ball mill, the ball milling time is 2h, the speed is 400r / min, and the ball milling mixture is put into the atmosphere tube furnace. Air is blown in by a blower, high-temperature solid-phase reaction is carried out at 1020℃ for 40min, and after cooling, vibration grinding is carried out. As for stirring and dissolving in hot water at 60℃ for 100min, then magnetic separation is performed. The resulting product is magnetite and copper slag. The rate is 89%, and the recovery rate of iron in the slag is 93.5%.

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Abstract

The invention discloses a method for efficiently decomposing and recycling valuable metal in copper slag. According to the method, after the copper slag and cryolite are mixed and ball-milled, the mixture is arranged in an air atmosphere for calcination; calcination products are crushed and undergo magnetic separation, and then magnetite is obtained. By the adoption of the method for efficiently decomposing and recycling the valuable metal in the copper slag, iron resources incapable of being reused in the copper slag can be directionally regulated and controlled to be efficiently converted into the magnetite under mild conditions, reduction and reclamation of the copper slag are achieved, the copper slag tail end single-pass treatment problem, the national high-grade iron ore resource starvation problem, and the environmental pollution problem are solved, and a green sustainable development road is opened up for treatment of the copper slag.

Description

Technical field [0001] The invention relates to a method for processing copper slag, in particular to a method for efficiently decomposing and recovering valuable metals in copper slag, and belongs to the cross field of metallurgical engineering and environmental engineering. Background technique [0002] In recent years, my country's copper output has grown rapidly, surpassing Chile to rank first in the world, but it also produces a large amount of waste slag. According to statistics, my country produces about 3 million tons of copper slag every year, and it is still increasing year by year. At present, these waste residues are stored in large quantities, which not only occupy land resources, but also cause a lot of waste of valuable metal resources; copper slag is a typical FeO-SiO 2 The slag contains 40% iron, which is much higher than the average grade of 29.1% of smelted iron ore. It is a potential iron resource. However, more than 80% of the iron in this type of slag exists ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02B03C1/015
CPCB03C1/015C22B1/02
Inventor 刘恢张立奉彭兵梁彦杰任力理王忠兵朱顺彭宁李燕春赵宗文雷杰
Owner CENT SOUTH UNIV
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