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Method for recycling copper from copper smelting slag

A technology for copper smelting slag and copper recovery, which is applied to the improvement of process efficiency, flotation, solid separation, etc. The effect of small fluctuation of selection index, improvement of flotation, and improvement of flotation recovery rate

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, the relatively mature process of recovering copper in copper slag is mainly to use the slag bucket method to carry out slow cooling and crystallization to improve the copper aggregation state, and then recover it through grinding and flotation. This process is simple and the investment is small, but the output of different smelting furnace The copper smelting slag has poor adaptability, the crystallization size of copper minerals is small and uneven, the flotation index fluctuates greatly, the production process is difficult to control, and the recovery rate of copper is low

Method used

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  • Method for recycling copper from copper smelting slag

Examples

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preparation example Construction

[0030] The composite additive used in the present invention adopts the following preparation method: weighing and mixing pyrite, chalcopyrite, coke powder and sodium humate according to the mass ratio, adding an appropriate amount of water, and then making pellets on a disc The 3-5mm pellets are made in the machine, and finally the pellets are dried until the water content is less than 2%, that is, the composite additive is obtained.

[0031] In the following examples, crushing and grinding are performed by coarsely crushing the modified slag to -5 mm, then crushing to -1 mm by high-pressure roller mill, and then finely grinding in a ball mill.

Embodiment 1

[0035] For the copper grade in the copper smelting slag of electric furnace depletion of 0.60%, add compound additives according to 3% of the mass of copper smelting slag (45% of pyrite, 5% of chalcopyrite, 40% of coke powder, 10% of sodium humate ) for slag modification, fully mixed and melted under the action of ultrasonic field, the modified slag undergoes slow cooling (under the action of centrifugal force and magnetic field, speed 10r / min, magnetic field strength 0.2T), crushing, grinding Finally, copper concentrate is obtained by flotation. The modification is carried out under the conditions of melting temperature 1250°C, cooling rate 1.5°C / min, and cooling end temperature 900°C. Conditions of modified slag in copper flotation: grinding fineness -0.045mm 90%; butyl xanthate 80g / t , after three times of beneficiation and three times of sweeping, the copper rough concentrate grade was 20.56%, and the copper recovery rate was 74.45%.

Embodiment 2

[0037] For the copper grade of 0.60% in the copper smelting slag of electric furnace depletion, add compound additives according to 4% of the mass of copper smelting slag (40% pyrite, 10% chalcopyrite, 45% coke powder, 5% sodium humate) The slag is modified, fully mixed and melted under the action of the ultrasonic field, and the modified slag is slowly cooled (under the action of centrifugal force and magnetic field, the speed is 15r / min, and the magnetic field strength is 0.25T), crushed and ground. , flotation to get copper concentrate. The modification is carried out under the conditions of melting temperature 1300°C, cooling rate 1.5°C / min, and cooling end temperature 900°C. Conditions of modified slag in copper flotation: grinding fineness -0.045mm 90%; butyl xanthate 80g / t , after three times of beneficiation and three times of sweeping, the copper rough concentrate grade was 21.34%, and the copper recovery rate was 76.57%.

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Abstract

The invention relates to a method for recycling copper from copper smelting slag. The method comprises the following steps: step 1, modifying copper smelting molten slag: adding 3 percent to 5 percent of a compound additive into the copper smelting molten slag with a molten state according to the mass ratio of the molten slag; carrying out ultrasonic treatment and sufficiently and uniformly blending and smelting, wherein the compound additive is prepared from the following components in percentage by mass: 40 percent to 50 percent of pyrite, 5 percent to 10 percent of chalcopyrite, 40 percent to 50 percent of coke powder, 5 percent to 15 percent of sodium humate, and the sum is 100 percent; step 2, slowly cooling the smelting slag: slowly cooling the modified smelting slag under the action of a centrifugal force and a magnetic field; step 3, carrying out flotation: carrying out crushing and ore milling on the slowly cooled modified slag and carrying out flotation treatment to obtain floated copper concentrate and tailings. According to the method provided by the invention, a mineral phase of the copper smelting molten slag is reconstructed and comprehensive recycling of copper and iron is realized; an experiment proves that the copper concentrate with the copper content more than 20 percent is obtained through flotation and the recycling rate of the copper is 71 percent to 80 percent.

Description

technical field [0001] The invention relates to a method for recovering copper from copper smelting slag, which belongs to the technical field of resource utilization of industrial waste slag. Background technique [0002] About 80% of the world's copper is produced by pyrometallurgy, and the remaining 20% ​​is obtained by hydrometallurgy. Usually, 1 ton of matte can produce 2-3 tons of copper slag. More than 97% of copper in my country is obtained by pyrometallurgy, such as reverberatory furnace smelting, flash furnace smelting, electric furnace smelting and converter smelting. In 2015, the output of refined copper in my country was as high as 7.96 million tons. At the same time, more than 15 million tons of copper slag were produced every year, and the cumulative output exceeded 120 million tons. Copper slag contains a large amount of available non-ferrous resources, such as copper, of which the copper grade is about 1%, which is much higher than the mineable grade of cop...

Claims

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Application Information

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IPC IPC(8): B03D1/00C22B15/00C22B7/04
CPCB03D1/00C22B15/0002C22B15/0054Y02P10/20
Inventor 朱德庆潘建李启厚郭正启师本敬薛钰霄张锋杨聪聪刘新奇田宏宇石玥王硕姚维杰鲁胜虎王颖钰
Owner CENT SOUTH UNIV
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