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New copper removal method for converter copper scale

A converter copper and decopper technology, which is applied in the field of converter copper slag decopper, can solve the problem that iron-containing copper slag cannot be used as raw material for ironmaking, etc., and achieve saving of copper and iron resources and land resources, simple equipment and short process flow Effect

Inactive Publication Date: 2012-05-23
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that iron-containing copper slag cannot be used as a raw material for ironmaking due to excessive copper content in copper slag, and to provide a method for removing copper in copper slag by chlorination and volatilization by using calcium chloride as a chlorination agent. Roasting process, that is, the method of removing copper from converter copper slag, so that copper slag can meet the raw material requirements of blast furnace ironmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: dry calcium chloride and copper slag are pressed 1: 10 mass ratio, 900 degree of roasting temperature, pass into protection gas nitrogen (oxygen partial pressure 0.1 standard atmospheric pressure), under the condition of roasting time 4 hours, Ca The volatilization rate is 2.11%, the volatilization rate of Fe is 4.02%, and the volatilization rate of Cu reaches 89.45%. Under this condition, Cu and Fe elements can be well separated, and an iron-rich ore with an iron grade of 56.8% and a copper content of 0.29% can be obtained.

Embodiment 2

[0016] Embodiment 2: dry calcium chloride and copper slag are pressed 2: 10 mass ratio, 950 degree of roasting temperature, pass into protection gas nitrogen (oxygen partial pressure 0.05 standard atmospheric pressure), under the condition of roasting time 5 hours, Ca The volatilization rate is 2.01%, the volatilization rate of Fe is 4.00%, and the volatilization rate of Cu reaches 90.15%. Under this condition, Cu and Fe elements can be well separated, and an iron-rich ore with an iron grade of 57.2% and a copper content of 0.30% can be obtained.

Embodiment 3

[0017] Embodiment 3: dry calcium chloride and copper slag are pressed 3: 10 mass ratio, 1000 degree of roasting temperature, pass into protection gas nitrogen (oxygen partial pressure 0.06 standard atmospheric pressure), under the condition of roasting time 3 hours, Ca The volatilization rate is 2.26%, the volatilization rate of Fe is 4.52%, and the volatilization rate of Cu reaches 91.05%. Under this condition, Cu and Fe elements can be well separated, and an iron-rich ore with an iron grade of 57.1% and a copper content of 0.27% can be obtained.

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Abstract

The invention relates to a separation technique for iron and copper in converter copper scale, in particular to a new copper removal method for converter copper scale. The new copper removal method comprises the following process: (1) proportioning raw materials, and mixing calcium chloride not containing crystal water with dry copper scale at mixing mass ratio of 1 / 10-3 / 10; (2) controlling the atmosphere, adopting nitrogen as carrying and shielding gas for roasting, mixing oxygen in the nitrogen, and controlling the oxygen partial pressure to be 0.05-0.1 standard atmospheric pressure; (3) controlling the temperature and time, and controlling the roasting temperature to be 900-1000 DEG C and the roasting time to be 3-5 hours; and (4) collecting copper chloride, introducing the mixed gas of nitrogen and the copper chloride to a gas collecting bottle with water, wherein the copper chloride dissolves in water and is collected, the nitrogen escapes and is collected for recycling, finally the copper volatilizes and is collected in a chloride form, while iron remains in the scale, thereby obtaining the iron ore for blast furnace iron making.

Description

technical field [0001] The invention relates to a technology for separating iron and copper from converter copper slag, in particular to a new method for removing copper from converter copper slag. Background technique [0002] my country produces more than 8 million tons of copper smelting slag each year (including more than 4 million tons of iron and nearly 20,000 tons of copper). These slags are compound ore metallurgical slags containing valuable metal compounds. There are many types and complex components. The slag contains Fe, Cu, Zn, Pb, Co, Ni and other valuable metals and a small amount of precious metals Au, Ag, etc., including 3.33% copper and 53.35% iron. The mass fraction of iron is much higher than that of iron ore in my country. Mining grade (TFe>27%). Due to the high copper content in copper slag, iron-containing copper slag cannot be used as iron-making raw material. At present, the copper utilization rate of copper smelting slag is less than 12%, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B15/00
CPCY02P10/20
Inventor 姜平国廖春发焦芸芬王旭
Owner JIANGXI UNIV OF SCI & TECH