Method for step recycling of iron, copper and noble metal from copper smelting waste slag

A technology for cascade recovery and copper smelting, which is applied in the field of comprehensive recovery of waste residue resources, can solve the problems of not obtaining a separate beneficiation product, poor migration and enrichment effect, harsh reaction conditions, etc., and achieves good separation and enrichment effect and high comprehensive recovery. Value, low residual effect

Inactive Publication Date: 2014-06-25
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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Problems solved by technology

but except Fe 3 o 4 In addition to the high silicon content in copper smelting slag, the high viscosity of copper smelting slag is also an important reason for the high viscosity of copper smelting slag. Carbon reduction can only partially reduce the viscosity of slag, so this method needs gas stirring to accelerate the process. Copper Settlement
Although the copper and iron components can be separated better, but because some precious metals are distributed in the magnet phase by metasomatism, only carbon coordination reduction is used, and the precious metals in the magnet phase will migrate and enrich in the copper concentrate. The effect is not good. The minimum residual copper content of the tailings obtained by this method is only 0.35%, and the magnetite phase needs to be oxidized again, and then the iron concentrate is recovered through magnetic separation. The reaction conditions are relatively harsh and the operation is complicated. The whole process is only to realize Selective precipitation of valuable components, no separate beneficiation products

Method used

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  • Method for step recycling of iron, copper and noble metal from copper smelting waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Aiming at copper smelting waste residue in a certain province of China, the main valuable metal contents are: Fe 35.28wt%, Cu 0.61wt%, Au 1.1g / t, Ag 18.5g / t. Carry out cascade recovery to it by the inventive method, its specific operation steps are as follows:

[0030] (1) Pelletizing: First, grind copper smelting waste slag until the particle size is less than 0.074mm, then pulverize the carbon powder, caustic soda and sodium sulfate to a particle size of less than 0.045mm; the above raw materials are fully mixed according to the following weight parts: copper 50 parts of smelting waste residue, 20 parts of carbon powder, 5 parts of caustic soda and 5 parts of Yuanming powder; the mixed material enters the pelletizer to make pellets, and the diameter of the pellets ranges from 1.4 to 1.6cm;

[0031] (2) Reduction roasting: Carry out reduction roasting of the pellets, the roasting temperature is 750°C, and the roasting time is 1.0 hour.

[0032] (3) Weak magnetic separat...

Embodiment 2

[0036] The steps of the present invention are the same as those in Example 1, the difference being that the parts by weight of each raw material in step (1) are: 20 parts of copper smelting waste residue, 20 parts of carbon powder, 2 parts of caustic soda and 5 parts of sodium sulfate; the average diameter of balls is 1 ~1.2 cm;

[0037] In step (2), the roasting temperature is 600°C, and the roasting time is 1.5 hours;

[0038] In step (3), the strength of the weak magnetic separation magnetic field is 800Oe, the residual copper content in the magnetic separation tailings is 0.12wt%, and the residual iron content is 2.23wt%;

[0039] In step (4), the washing water volume of Nelson gravity separation is 2.0L / min, and the rotation speed is 1500r / min, and qualified precious metal-rich copper concentrate and high-quality iron concentrate are respectively obtained.

[0040] Concentrate indicators: obtained iron concentrate with total Fe content of 64.55wt%, total Fe recovery rate...

Embodiment 3

[0042] The steps of the present invention are the same as those in Example 1, the difference being that the parts by weight of each raw material in step (1) are: 40 parts of copper smelting waste residue, 8 parts of carbon powder, 4 parts of caustic soda and 2 parts of sodium sulfate; the average diameter of the pellets is 1.7 ~1.8 cm;

[0043] In step (2), the roasting temperature is 800°C, and the roasting time is 1.2 hours;

[0044] In step (3), the strength of the weak magnetic separation magnetic field is 900Oe, the residual copper content in the magnetic separation tailings is 0.11wt%, and the residual iron content is 2.15wt%;

[0045] In step (4), the washing water volume of Nelson gravity separation is 4.0L / min, and the rotation speed is 2200r / min, and qualified precious metal-rich copper concentrate and high-quality iron concentrate are respectively obtained.

[0046] Concentrate indicators: obtained iron concentrate with total Fe content of 65.11wt%, total Fe recove...

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Abstract

The invention discloses a method for step recycling of iron, copper and noble metal from copper smelting waste slag. The method comprises the following steps: firstly, respectively crushing and treating copper smelting waste slag, a reducing agent carbon powder and an alkali substance caustic soda and a sodium salt anhydrous sodium sulfate into certain granularity, sufficiently and uniformly mixing the raw materials, pelletizing, adding alkali and performing reduction roasting at a high temperature, wherein the functions of the caustic soda and the anhydrous sodium sulfate are to reduce the viscosity of the slag, and effective aggregation of copper particles in the slag and sufficient enrichment of an iron component to magnetite phase are facilitated; after roasting is accomplished, performing magnetic selection to obtain magnetic concentrate (iron-copper component); and subsequently performing Nelson reselection to separate the copper and the noble metal in the magnetic concentrate. The magnetic tailings can be applied to the building industry and high-quality abrasive preparation. According to the method, the caustic soda and the anhydrous sodium sulfate are innovatively added, and Nelson reselection is adopted, so that step recycling of noble metal in the copper smelting waste slag is achieved, the method has the advantages of simplicity and convenience in process, high applicability, low production cost, no emission and the like, a novel method is provided for comprehensive utilization of the copper smelting waste slag, and remarkable economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of waste slag resources, in particular to a method for cascade recovery of iron, copper and precious metals from waste slag produced in the copper concentrate smelting process. Background technique [0002] Copper slag contains a large amount of available resources, including a considerable amount of iron, copper, and precious metals such as gold, silver, and palladium that coexist with copper, and has a high comprehensive recovery value. With the continuous development and utilization of resources, copper ore resources are becoming increasingly depleted. At present, copper ore with a copper content of 0.2-0.3% has been mined, while the waste slag produced during the copper concentrate smelting process contains more than 0.5% copper. The modern copper smelting process focuses on improving production efficiency. The residual copper content in the waste slag remains high, and most of the precio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B11/00C21B3/04C22B1/02B03C1/02B03B7/00
CPCY02P10/20Y02W30/50
Inventor 赵开乐王昌良邓伟廖祥文刘厚明饶系英王晓慧
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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