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A method for recovering iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting

A technology for smelting and recovering iron in an electric furnace is applied in chemical instruments and methods, ferrous oxide, and the improvement of process efficiency, etc., to achieve the effects of expanding the scope of application, good prospects for industrial promotion and application, and easy purification and removal of impurities

Active Publication Date: 2019-09-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for recovering iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting, mainly aiming at the accumulation of high copper bottom iron produced in the electric furnace zinc smelting process, which takes up a lot of land, environmental pollution, The method of the present invention provides an effective way to solve a series of problems such as the difficulty in recovering valuable metals and iron resources by traditional metallurgical technology

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  • A method for recovering iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting

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Embodiment 1

[0035] Embodiment 1: The method for reclaiming iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting, the specific operations are as follows:

[0036] The bottom iron produced in an electric furnace zinc smelting process is discharged out of the furnace after further heating and melting, and is stacked in the smelting plant after natural cooling. The mass percentage of its chemical composition is: Fe 85%, Cu 6%, Sn 1%, As 0.2% , In 800g / t. Cut and crush it to 4-6 cm, put it into a corundum crucible, and then put it into a high-temperature atmosphere furnace for high-temperature melting. The melting temperature is 1450 °C and the holding time is 60 min. The inlet flow rate is 2.0 L / min and the volume fraction is 5% O 2 and 95% N 2The gas is used to start selective oxidation smelting, and the smelting time is 180 min. After the reaction, close the valve of the gas flow meter, and place the corundum crucible containing the high-temperature me...

Embodiment 2

[0038] Embodiment 2: The method for reclaiming iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting, the specific operation is as follows:

[0039] A copper smelter purchased bulk bottom iron with a particle size of 8-10 cm. The mass percentage of its chemical composition is: Fe55%, Cu: 25%, Sn: 2.5%, As: 0.2%, In 1500 g / t . A small piece of bottom iron was put into a corundum crucible, and then melted at a high temperature in a high-temperature atmosphere furnace with a melting temperature of 1350 °C and a holding time of 50 min. The inlet flow rate is 1.0 L / min and the volume fraction is 25% O 2 and 75% N 2 The gas is used to start selective oxidation smelting, and the smelting time is 90 min. After the reaction, close the valve of the gas flow meter, and place the corundum crucible containing the high-temperature melt in the air to cool naturally to obtain bottom copper and ferrous oxide slag. Base copper is a tin-containing primary c...

Embodiment 3

[0041] Embodiment 3: The method for reclaiming iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting, the specific operation is as follows:

[0042] A zinc smelter uses the electric furnace zinc smelting process to produce active zinc powder. Since the raw material to be processed is high-copper and high-iron flotation zinc concentrate (Cu: 1%, Fe: 14.5%), zinc powder is produced and high Copper base iron, the mass percentage of its chemical composition is: Fe: 85%, Cu: 6%, Sn: 2.5%, As: 1%, In 1200g / t. It was cut and crushed to 8-10 cm and put into a corundum crucible, and then melted at a high temperature in a high-temperature atmosphere furnace with a melting temperature of 1550 °C and a holding time of 10 min. The inlet flow rate is 2.5 L / min and the volume fraction is 30% O 2 and 70% N 2 gas, start selective oxidation smelting, smelting time is 30min. After the reaction, close the valve of the gas flow meter, and place the corundum cr...

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Abstract

The invention discloses a method for recovering iron and enriching copper-tin from blaster furnace slag (commonly known as bottom iron) of electric furnace zinc smelting, and belongs to the field of metallurgy and chemical separation. The method comprises the steps that the bottom iron is subjected to cutting and crushing treatment firstly, after an alloy is totally melted under the high temperature, melted alloy liquid is subjected to selective oxidation under the oxidizing atmosphere, coarse copper containing tin and ferrous oxide slag are obtained, and volatilization separation of indium and a part of arsenic is realized; hydrochloric acid leaching of the ferrous oxide slag is conducted, then filtering is conducted, and filtrate and filter residue are obtained; cooper removal is conducted on the filtrate, deep removal of impurities is conducted on copper removing liquid, and then a pure FeCl2 solution is obtained; and finally, spray pyrolysis is conducted, so that iron oxide red andhydrochloric acid are obtained, and the regeneration rate of the hydrochloric acid is 95-99%. The method for recovering the iron and enriching the copper-tin from the blaster furnace slag of electricfurnace zinc smelting provides a new way for high value utilization of the blaster furnace slag of electric furnace zinc smelting and is green, environmentally friendly, remarkable in energy saving effect and good in industrial application prospect.

Description

technical field [0001] The invention relates to the field of metallurgy and chemical separation, in particular to a method for recovering iron and enriching copper and tin from the bottom slag of electric furnace zinc smelting. Background technique [0002] Bottom slag, commonly known as bottom iron, is an intermediate material produced in the electric furnace zinc smelting process. Its high-value and clean utilization has always been a difficult problem to be solved in the metallurgical industry at home and abroad. [0003] Electric furnace zinc smelting has the characteristics of high smelting recovery efficiency, simple industrial equipment, high thermal efficiency, and less environmental pollution. It is one of the important technologies for zinc smelting. With the continuous progress of zinc vapor condensation technology, zinc powder can be directly obtained from zinc concentrate after the electric furnace smelting process. This product has the advantages of fine partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B15/00C01G49/04C01B7/03
CPCC01B7/035C01G49/04C01P2006/80C22B7/001C22B7/007C22B7/04C22B15/0091Y02P10/20Y02P20/10
Inventor 王华郑永兴文书明赖振宁吕晋芳
Owner KUNMING UNIV OF SCI & TECH
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