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Method for recovering valuable metals from copper slag

A recovery method and technology for valuable metals, applied in the field of copper smelting, can solve problems such as low recovery rate of copper slag, and achieve the effects of simple process flow, high recovery rate and improved recovery rate

Active Publication Date: 2020-06-12
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a recovery method of valuable metals in copper slag, to solve the problem that the recovery rate of valuable metals in copper slag is relatively low in existing copper slag recovery methods

Method used

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  • Method for recovering valuable metals from copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The process flow chart of the recovery method of valuable metals in copper slag is as follows figure 1 As shown, the copper slag is converter copper slag, wherein the copper, iron, lead, zinc, and gold grades are 1.7wt%, 45wt%, 0.9wt%, 0.8wt%, 3.2g / t, and the magnetic iron content accounts for 15wt% .

[0038] After adding 14wt% calcium chloride (accounting for the weight percentage of converter copper slag) in the above-mentioned converter copper slag, place it in a 2450MHz microwave tube furnace, wherein under the condition of microwave power 6KW, heat up with 5°C / min Roast at a temperature of 1000°C for 2 hours, and at the same time continuously feed a mixed gas of nitrogen and oxygen (the volume ratio of the two is 10:1) into the microwave tube furnace to control the oxygen-deficient atmosphere to obtain roasted slag and roasted flue gas.

[0039] After the roasting slag is cooled, carry out magnetic separation under magnetic field intensity 2000Oe and obtain Fe gr...

Embodiment 2

[0042] The magnetically separated concentrate of the roasted slag obtained after roasting in Example 1 is used as a wave-absorbing material, and in terms of the weight percentage of the wave-absorbing material, Fe 3 o 4 The content is 60wt%.

[0043] The process flow chart of the recovery method of valuable metals in copper slag is as follows figure 1 shown. Copper slag is a closed blast furnace copper smelting slag, in which the iron in the copper slag mainly exists in the form of ferrosilicate, accounting for 93wt% of the total iron minerals, and most of the lead, zinc, copper, nickel, cobalt, and gold exist in ferrosilicate middle.

[0044] In terms of the weight percentage of copper slag, add the above-mentioned absorbing material in a proportion of 18wt%, add 12wt% sodium chloride and 6wt% activated carbon at the same time, and then move it to a microwave tube furnace for regulating the atmosphere, wherein The temperature was raised to 900°C under the frequency of 4KW...

Embodiment 3

[0047] The process flow chart of the recovery method of valuable metals in copper slag is as follows figure 1 shown.

[0048] Copper slag is flash smelting copper slag, in which iron content of iron silicate in copper slag is three times that of magnetic iron minerals, Fe content in iron silicate minerals is about 38wt%, copper, nickel, cobalt, gold grades are 0.32 wt%, 0.24wt%, 0.08wt%, 2.3g / t, but it is closely related to iron silicate minerals, and it is difficult to recycle by conventional methods.

[0049] After adding 10wt% sodium chloride (accounting for the weight percentage of copper slag) and uniformly mixing with the copper smelting slag, under the condition of microwave power 3KW, after heating up to 950°C with 4°C / min, control the chlorine deficiency atmosphere The roasted slag and roasted flue gas obtained by heating and heat-preserving for 4 hours, wherein the copper-nickel-cobalt grade in the roasted slag is lower than 0.01wt%, and the proportion of magnetic p...

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Abstract

The invention provides a method for recovering valuable metals from copper slag. The recovery method comprises the steps that under the microwave condition, the copper slag, a chlorinating agent and awave absorbing material are roasted, roasted slag and roasted flue gas are obtained, in the roasting process, the microwave frequency is 2450 MHz, and the microwave power is 2-75 KW; and the roastedflue gas, a flue gas absorbent and a metal ion precipitator are subjected to a precipitation reaction, metal precipitates are obtained, and the flue gas absorbent is water or an alkaline aqueous solution. By the adoption of the method, the iron element and other valuable metal elements in the copper slag can be effectively separated, then targeted treatment can be carried out, and the effect of greatly increasing the recovery rate of valuable metals in the copper slag is achieved; and in addition, the recovery method has the advantages of being wide in adaptability to the copper smelting slag,simple in technological process, high in recovery rate of valuable metal and the like.

Description

technical field [0001] The invention relates to the field of copper smelting, in particular to a method for recovering valuable metals in copper slag. Background technique [0002] The modern copper smelting process focuses on improving production efficiency. Copper smelting slag often contains residual copper and other valuable metals, such as iron, copper, zinc, lead, cobalt, nickel and other valuable metals and a small amount of gold and silver precious metals. The main components of the existing copper smelting slag are iron silicate and magnetic iron, and the iron content is relatively large. Existing literature (CN 108753252 A) provides a modified copper slag by melting and oxidation of calcium oxide to selectively enrich Fe in the copper slag into magnetic iron oxide, and the resulting magnetic material has good wave-absorbing characteristics. [0003] At present, the methods for comprehensive recovery of metal elements in copper smelting slag include mineral process...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B13/02C22B13/00C22B11/02C22B11/00C22B15/00C22B19/30C22B19/20C22B23/02C22B23/00B03C1/02
CPCC22B7/04C22B7/001C22B7/006C22B1/02C22B13/025C22B13/045C22B11/023C22B11/044C22B15/0006C22B15/0089C22B19/30C22B19/20C22B23/02C22B23/0461B03C1/02Y02P10/20
Inventor 康金星于传兵宋磊郭素红王传龙刘志国王鑫王亚运
Owner CHINA ENFI ENGINEERING CORPORATION
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