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Comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag

A recovery method and technology of copper slag, which is applied in the comprehensive recovery of zinc and lead, iron, and copper extraction, can solve the problems of difficult separation and recovery of valuable metal elements, and achieve the effects of stable performance, strong adaptability, and short process flow

Active Publication Date: 2020-07-21
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, it is of great significance to find a method with energy saving, high efficiency, low environmental pollution and high resource utilization rate in view of the problem that the valuable metal elements wrapped in iron silicate minerals in copper slag are difficult to separate and recycle.

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  • Comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag

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Embodiment approach

[0026] According to a typical implementation of the present invention, the copper slag comprises the following components in mass percentage: Cu 0.1-30%, Pb 0-20%, Zn 0-20%, Fe 15-50% and SiO 2 10~40%.

[0027] According to a typical implementation of the present invention, the classification in the grinding and classifying step is 0.2mm screening and classifying, the difficult-to-grind material is the material with a particle size greater than 0.2mm after grinding for 5 minutes, and the difficult-to-grind material is the material with good ductility , such as copper, etc.

[0028] Preferably, in the second alkali leaching step, the concentration of caustic soda is 10-20% after the molten alkali slurry is diluted with water, and the time for the second alkali leaching is 1-3 hours. The secondary alkaline leaching residue is non-alkali-soluble copper iron oxide or hydroxide, and the secondary alkaline leaching solution is lead-zinc leaching solution.

[0029]Preferably, the ...

Embodiment 1

[0040] Will contain 3% copper, 6% lead, 3% zinc, 20% iron, SiO 2 20% of a certain copper smelting slag is first crushed to 2mm and then ground by a ball mill for 5 minutes. The content of the grinding fineness -0.074 mm accounts for 90%. The grinding product is ground with 15% NaOH solution at a liquid-solid ratio of 5:1 at 90°C Stirring and pre-alkali leaching for 3 hours, after filtration, the mixture containing 3.6% copper, 6.2% lead, 3.1% zinc, 24% iron, and SiO 2 23.6% and the yield is 83.3% alkali preleaching slag. The pre-leached slag and caustic soda particles are heated and roasted at a microwave power of 5kW at a mass ratio of 1:1.5. After the temperature is raised to 350°C at a rate of 6°C / min, the molten soda is leached for 3 hours under microwave irradiation with heat preservation and stirring, and the molten soda slurry is cooled. Finally, add water to dilute to a solution with an alkali mass concentration of 10%, stir and wash at room temperature for leaching f...

Embodiment 2

[0042] Such as figure 1 As shown, copper blowing slag with copper, lead, zinc, and iron contents of 20.3%, 12.5%, 2.8%, and 22.6% respectively. The phase analysis of the copper slag shows that lead and zinc basically exist in iron silicate minerals. 15% copper exists in silicate minerals. After the copper blowing slag is crushed and ground, it is screened and classified with a 0.2mm sieve to separate 35% of the hard-to-grind copper material, and the -0.2mm material is treated with 12% NaOH solution at a liquid-solid ratio of 3:1 at 90°C Pre-alkali leaching under stirring for 4 hours, and after filtration, 15.6% copper, 16% lead, 3.6% zinc, 24% iron, and SiO were obtained. 2 23.6% and a yield of 86% pre-alkali leaching slag. Pre-leaching slag and caustic soda particles in a mass ratio of 1:2.5 are heated and roasted at a microwave power of 6kW, and then heated to 400°C at a rate of 8°C / min, and the molten soda is leached for 4 hours under microwave irradiation with heat prese...

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Abstract

The invention discloses a comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag. The method comprises the following steps: an ore grinding and grading step, namelycrushing copper slag, performing grinding and screening, and separating out difficult-to-grind materials to obtain a primary material; a melting alkali leaching, namely carrying out melted alkali extraction on the primary material, and enhancing the melted alkali leaching by microwave irradiation at the same time to obtain melted alkali slurry; a secondary alkali leaching step, namely diluting themelted alkali slurry with water, carrying out secondary alkali leaching, and performing filtering to obtain secondary alkali leaching residues and secondary alkali leaching liquid; and a valuable metal recovery step, namely recovering valuable metals in the secondary alkali leaching liquid and the secondary alkali leaching residues respectively. The method has the advantages of environmental protection, short process flow, stable performance and strong adaptability of smelting slag.

Description

technical field [0001] The invention relates to the fields of nonferrous metallurgy and secondary resource recycling, in particular to a comprehensive recycling method for extracting copper, iron, zinc and lead from copper slag. Background technique [0002] Copper slag is the slag produced in the process of copper smelting, zinc smelting, cadmium smelting, etc. It is a kind of non-ferrous metal slag. In my country's copper production based on pyrometallurgy, 2-3 tons of slag will be produced for every 1 ton of copper produced. The modern copper smelting process focuses on improving production efficiency, and the content of residual copper and other valuable metals in copper slag increases, often containing iron, copper, zinc, lead, cobalt, nickel and other valuable metals and a small amount of precious metals. The main minerals in copper slag are iron-bearing minerals, mostly iron-bearing olivine and magnetic iron oxide minerals. In the process of copper smelting, Pb, Zn,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B15/00C21B15/00C22B19/20C22B13/00C01B33/00
CPCC01B33/00C21B15/00C22B7/008C22B7/04C22B13/045C22B15/008C22B19/24C22B19/26Y02P10/134Y02P10/20
Inventor 康金星宋磊于传兵郭素红刘志国王传龙王亚运王鑫
Owner CHINA ENFI ENGINEERING CORPORATION
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