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Method for reducing and extracting copper smelting waste slag through microwave carbon heating

A waste slag and copper smelting technology, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve problems such as difficult industrialization and harsh process conditions, and achieve the goals of reducing labor intensity, promoting development, promoting clean production and circular economy Effect

Inactive Publication Date: 2011-07-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 The ferrous oxide is transformed into ferric oxide, and then the iron is recovered by magnetic separation, but the process conditions used are relatively harsh, and it is not easy to industrialize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: will grind to particle size and be less than 0.15mm main component content is Fe 38.52wt%, Cu 0.936wt%, SiO 2 50g of copper slag with 34.90wt% and 3.06wt% CaO, 15g of anthracite with C content greater than 76.5wt%, 10g of calcium oxide and 5g of water, mixed evenly to make pellets with a diameter of Φ10-20mm, put them in an oven at 120°C Dry for 2 hours, put the dried pellets in a self-made microwave oven with a microwave power of 3000W and calcinate at a temperature of 1300°C for 0.5 hours, cool to room temperature and grind until the particle size is less than 0.15mm, and then in a magnetic field with a strength of 72-136kA / Magnetic separation on a magnetic separator of m, obtained 19.7g of magnetic product, 46.8g of non-magnetic product (magnetic separation tailings), and the content of elemental iron in the magnetic product was 92.6wt%.

Embodiment 2

[0017] Embodiment 2: will pulverize to particle size less than 0.15mm main component content is Fe 40.31wt%, Cu 1.18wt%, SiO 2 33.90wt%, CaO4.08wt% copper slag 50g, C content 85wt% graphite 16g, calcium carbonate 20g, add 7g water and mix evenly, make a pellet with a diameter of 10-20mm, put it in an oven at 150 ° C Dry for 1 hour, put the dried pellets in a self-made microwave oven with a microwave power of 3000W and calcinate at a temperature of 900°C for 2 hours, cool down to room temperature and grind until the particle size is less than 0.15mm, and then put them in a magnetic field with a strength of 72-136kA / M magnetic separator magnetic separation, to obtain magnetic product 19.4g, non-magnetic product (magnetic separation tailings) 48.5g, elemental iron content in the magnetic product 94.5wt%.

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Abstract

The invention relates to a method for reducing and extracting copper smelting waste slag through microwave carbon heating, which comprises the following steps: pulverizing copper slag, reducing agents (one material or a mixture of several materials in anthracitic coal, graphite, refinery coke and coke) and calcium oxide or calcium carbonate; mixing the ingredients; adding binding agents for briquetting; drying the materials; then, carrying out mineral phase reconstruction and carbon heat reduction reaction at the high temperature through using microwaves as heating sources; converting fayalite in the slag into ferric oxide, and reducing the ferric oxide into iron; and then, separating and recovering the iron through pulverization and magnetic selection separation. After further copper recovery, nonmagnetic products can be used as raw materials for firing cement.

Description

1. Technical field [0001] The invention relates to a method for extracting iron from waste slag of copper smelting by microwave carbothermal reduction, which belongs to the technical field of microwave metallurgy. 2. Background technology [0002] Copper smelting waste slag mainly refers to pyro-smelting slag, which is one of the main types of slag produced in large quantities in the non-ferrous metal smelting process. The annual output is nearly 2 million tons, and the cumulative amount reaches tens of millions of tons. Pyromelting copper slag is mainly composed of fayalite phase and amorphous glassy phase, and the slag contains a large amount of iron, copper, and precious metals and rare metals associated with copper. The iron in the slag is mainly distributed in the olivine phase and the magnetic iron oxide phase, while the copper is mainly dispersed in the slag as fine particles. The content of Cu, Fe and other metals in copper slag is relatively high. For example, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C21B11/00C22B1/242
Inventor 廖亚龙徐福昌彭金辉
Owner KUNMING UNIV OF SCI & TECH
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