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Method for extracting iron from copper smelting waste residue

A copper smelting and waste slag technology, which is applied in the field of extracting iron from copper smelting waste slag, can solve the problems of harsh process conditions and difficult industrialization

Inactive Publication Date: 2010-02-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sui Zhitong from Northeastern University et al. (Zhang Linnan. Research on the selective precipitation of valuable components in copper slag [D]. Shenyang, Northeastern University, 2005.) used high-temperature oxidation to extract valuable elements in copper slag, and oxidized the fayalite Ferrous oxide is converted into ferric oxide, and the conversion rate of iron reaches 60%. After conversion, iron is recovered by magnetic separation, but the process conditions adopted are relatively harsh, and it is not easy for industrialization
There are also some scholars in Japan, Chile and other foreign countries who are committed to the research of reverberatory furnace depleted copper slag, but the research is mainly aimed at the blister copper converter slag with a copper grade greater than 4%. The processing methods adopted mainly include: direct leaching, direct flotation, Oxidation or sulphation roasting - leaching, but there is no report on the study of copper smelting slag containing about 1.0% copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: will grind to particle size and be less than 0.15mm composition content is Fe38.52, Cu0.936, SiO in wt% 2 34.90, 50 g of copper slag of CaO3.06, 20 g of anthracite coal with a component content of C76.5 in wt %, and 20 g of calcium oxide with a component content of CaO98.5 in wt % are fully mixed; at a temperature of 1150 ° C, calcined for 4 hours, After cooling to room temperature, it is ground to a particle size of 0.125mm, and then magnetically separated in a magnetic separator with a magnetic field strength of 72-136kA / m. 19.5 g of magnetic products and 54 g of non-magnetic products (magnetic separation tailings) were obtained, and the content of elemental iron in the magnetic products was 86.5 wt%.

Embodiment 2

[0011] Embodiment 2: will grind to particle size and be less than 0.15mm composition content is Fe38.52, Cu0.936, SiO in wt% 2 34.90, 50 g of copper slag of CaO3.06, 30 g of anthracite coal with a component content of C 76.5 in wt %, and 25 g of calcium oxide with a component content of CaO98.5 in wt % are fully mixed; at a temperature of 1100 ° C, calcined for 3 hours, After cooling to room temperature, it is ground to a particle size of 0.15mm, and then magnetically separated in a magnetic separator with a magnetic field strength of 72-136kA / m. 19.6 g of magnetic products and 60.5 g of non-magnetic products (magnetic separation tailings) were obtained, and the content of elemental iron in the magnetic products was 87.8 wt%.

Embodiment 3

[0012] Embodiment 3: will pulverize to particle size and be less than 0.15mm composition content is Fe38.52, Cu0.936, SiO in wt% 2 34.90, 50g of copper slag of CaO3.06, 25g of anthracite of C 76.5 with component content in wt%, and CaCO in component content in wt% 3 30g of 98.5 calcium carbonate is mixed well and evenly; calcined at 1200°C for 4.5 hours, cooled to room temperature, ground to a particle size of 0.74mm, and then magnetically separated in a magnetic separator with a magnetic field strength of 72-136kA / m. 19.0 g of magnetic products and 55 g of non-magnetic products (magnetic separation tailings) were obtained, and the content of elemental iron in the magnetic products was 88.2 wt%.

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Abstract

The invention relates to a method for extracting iron from copper smelting waste residue. The method comprises the following steps: pulverizing copper slag, a reductant which is a mixture comprising one or more of anthracite, graphite, petroleum coke and coke, calcium oxide or calcium carbonate into a certain granularity, fully mixing the materials, carrying out mineralogical reconstruction and carbothermal reduction under high temperature to convert fayalite in the residue into iron oxide and then reduce the iron oxide into iron, and recovering the iron by magnetic separation, wherein, nonmagnetic products can be taken as raw materials for burning cement.

Description

1. Technical field [0001] The invention relates to a process for recovering iron from waste slag produced in the copper smelting process, in particular to a process for recovering iron from the waste slag produced in the copper smelting process by using a carbothermal reduction method. 2. Background technology [0002] Copper slag is one of the large amount of slags in non-ferrous metal smelting waste slags. The stacking of these slags not only occupies a large amount of land, but also brings difficulties to production and management. Cause some pollution to water resources. Therefore, researching effective methods of copper slag treatment and extracting valuable components in slag can not only realize the reuse of waste resources, realize the reduction and harmlessness of industrial waste, but also obtain certain economic benefits. [0003] Copper smelting waste slag is mainly pyro-smelting slag, with an annual output of more than 1.5 million tons and a total of more than ...

Claims

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Application Information

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IPC IPC(8): C21B15/02
Inventor 廖亚龙李东波彭金辉
Owner KUNMING UNIV OF SCI & TECH
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