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Method for recovering copper from copper smelting slag

A technology of copper smelting slag and copper recovery, which is applied to the improvement of process efficiency, flotation, solid separation, etc. It can solve the problems of difficult control of the production process, small crystal size of copper minerals, poor adaptability of copper smelting slag, etc., and achieve improvement Floatability, flotation index fluctuation is small, and the effect of improving flotation recovery rate

Active Publication Date: 2019-04-30
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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 recovering 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 pelletizing on a disc 3-5mm pellets are prepared in the machine, and finally the pellets are dried until the moisture content is less than 2% to obtain the compound additive.

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

Embodiment 1

[0035] For copper smelting electric furnace depleted molten slag, the copper grade is 0.60%, and 3% of the copper smelting slag quality is added with compound additives (pyrite 45%, chalcopyrite 5%, coke powder 40%, sodium humate 10% ) Modification of molten slag, fully mixed and melted under the action of ultrasonic field, modified slag is slowly cooled (under the action of centrifugal force and magnetic field, rotating speed 10r / min, magnetic field intensity 0.2T), crushing and grinding Afterwards, flotation obtains copper concentrate. Modification is carried out under the conditions of melting temperature of 1250℃, cooling rate of 1.5℃ / min, and cooling end temperature of 900℃. The modified slag is subjected to copper flotation conditions: grinding fineness -0.045mm 90%; butyl xanthate 80g / t After three times of selection and three times of sweeping, the grade of crude copper concentrate is 20.56% and the copper recovery rate is 74.45%.

Embodiment 2

[0037] For copper smelting electric furnace depleted molten slag, the copper grade is 0.60%, and compound additives are added according to 4% of the copper smelting slag quality (pyrite 40%, chalcopyrite 10%, coke powder 45%, sodium humate 5%) The slag is modified, mixed and melted under the action of ultrasonic field, and the modified slag is slowly cooled (under the action of centrifugal force and magnetic field, the speed is 15r / min, the magnetic field intensity is 0.25T), after crushing and grinding , Flotation obtains copper concentrate. Modification is carried out under the conditions of melting temperature of 1300℃, cooling rate of 1.5℃ / min, and cooling end temperature of 900℃. The modified slag is subjected to copper flotation conditions: grinding fineness -0.045mm 90%; butyl xanthate 80g / t After three times of selection and three times of sweeping, the grade of crude copper concentrate is 21.34%, and the copper recovery rate is 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, and belongs to the technical field of industrial waste slag resource utilization. Background technique [0002] About 80% of the world's copper is produced by pyrometallurgical processes, and the remaining 20% ​​is obtained by hydrometallurgy. Usually, 1 ton of matte can produce about 2-3 tons of copper slag. More than 97% of copper in my country is obtained by pyrometallurgical smelting, such as reverberatory furnace smelting, flash furnace smelting, electric furnace smelting and converter smelting. In 2015, my country's refined copper output reached 7.96 million tons, while at the same time it produced more than 15 million tons of copper slag each year, and the cumulative output exceeded 120 million tons. Copper slag contains a large number of usable non-ferrous resources, such as copper, of which the copper grade is about 1%, which is much higher than the mineable grade o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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