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Method for recovering iron and zinc from copper tailing slag

A copper tailings slag and iron recovery technology, which is applied to fluidized bed furnaces, furnaces, furnace types, etc., can solve the problems of waste of resources and low prices, and achieve the effect of improving economic and social values ​​and improving the industrial chain

Inactive Publication Date: 2018-03-23
DONGYING FANGYUAN NONFERROUS METALS +2
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Problems solved by technology

Among them, the content of valuable elements: about 0.3% of copper, about 42% of iron, and about 3% of zinc, has the value of recycling iron and zinc, but copper tailings are currently mainly sold as cement raw materials, and its price is low, which to a certain extent causes waste of resources

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  • Method for recovering iron and zinc from copper tailing slag

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Embodiment Construction

[0020] The present invention will be further explained below in conjunction with the drawings.

[0021] A method for recovering iron and zinc from copper tailings slag, and its steps are:

[0022] 1) Copper tailings containing copper, nickel, iron, zinc, silicon, calcium and other elements are mixed with reduced coal, limestone, bentonite, and NCP in the batching room through a strong mixer through a strong mixer and pelletized. After sieving and drying the green balls, enter the pre-reduction furnace, heat it to 900°C—1200°C, and reduce part of the tailings, then enter the next step ironmaking furnace;

[0023] 2) The temperature is increased to 1200-1600°C in the ironmaking furnace, and the materials continue to heat up and melt, and the materials melt to form a liquid molten pool, reducing oxides such as zinc oxide and iron oxide;

[0024] 3) The reduced zinc enters the flue gas system in the form of steam, cools down, and collects the dust to obtain dust rich in zinc oxide;

[0025...

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Abstract

The invention provides a method for recovering iron and zinc from copper tailing slag. The method comprises the following steps: the copper tailing slag, reduced coals, limestone, bentonite and NCP are mixed by a powerful mixer through an adhesive tape machine and a liquid bonding agent in a burdening chamber for pelletizing and screening; green balls are dried to enter a pre-reduction furnace; part of tailings are reduced to enter an iron making furnace; materials are continuously heated for melting to reduce such oxides as zinc oxide and iron oxide; reduced zinc is fed in a smoke system in asteam form; smoke is collected to obtain zinc oxide dust; cast iron blocks are discharged in a molten state from reduced iron in the iron making furnace; and metal iron blocks of steel making raw materials are obtained through recovery. The method has the following advantages: the recovery of iron and zinc resources in the copper tailing slag is realized; wastes are changed to valuable things; the problems of land occupation by copper tailing slag stacks and environmental protection are reduced; the industrial chain in the nonferrous copper smelting industry is improved; the economical valueand the social value of the tailing slag are improved; and active meanings are achieved on environmental protection and comprehensive utilization of resources.

Description

Technical field [0001] The invention relates to the field of recovering iron and zinc, in particular to a method for recovering iron and zinc from copper tailings. Background technique [0002] As an important basic industry of the national economy, China's non-ferrous metal industry is a supporting industry for realizing industrialization and a strong guarantee for the rapid development of my country's national economy. However, with the rapid development of the non-ferrous industry, especially in copper smelting, a large amount of smelting slag is inevitably produced during the production process, causing environmental pollution and waste of resources. [0003] Faced with the increasingly stringent requirements for environmental protection and the increasingly scarce mineral resources, in order to develop non-ferrous smelting waste slag resources and improve the resource utilization rate of tailings, more and more people of insight attach great importance to the comprehensive uti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B19/34C22B1/242
CPCC21B13/0006C22B1/2406C22B1/242C22B19/34
Inventor 崔志祥王智谭克勤王海滨魏传兵侯鹏李翔郑军涛杜武钊
Owner DONGYING FANGYUAN NONFERROUS METALS
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