Method for treating iron-containing red mud through coal-based shaft furnace technology

A red mud and shaft furnace technology, applied in the environmental protection field of comprehensive utilization of red mud resources, can solve the problems of increased difficulty in blast furnace smelting operations, bottlenecks in large-scale production, low metallization rate, etc., and achieve advanced and reliable production technology and high product quality The effect of stability and high ball strength

Inactive Publication Date: 2018-02-27
WUHAN COSRED SCI & TECH LTD
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AI Technical Summary

Problems solved by technology

[0009] (1) Based on the traditional sintering/pelletizing oxidative roasting process, the conversion of high-iron red mud into oxidative sinter or pellets can realize large-scale red mud resource recovery and utilization, but there are high iron grade requirements for red mud raw ore, and sintering /Pellet roasting treatment of red mud has the problems of high production cost and unstable product quality; the prepared oxidative sinter/pellet is used as raw material for blast furnace smelting, and the content of alkali metal and gangue in the ore is high, which is easy to cause blast furnace alkali metal The increase in load and slag smelting will increase the difficulty of blast furnace smelting operation and increase the energy consumption of the process, which is not accepted by iron and steel enterprises, and it is difficult to achieve the goal of effective comprehensive utilization of red

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  • Method for treating iron-containing red mud through coal-based shaft furnace technology

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Experimental program
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Example Embodiment

[0029] Example 1: A method for treating iron-containing red mud with a coal-based shaft furnace process, the steps of which are:

[0030] (1) Iron-bearing red mud ore is ground, separated by high gradient magnetic separation, and dried to obtain tailings and red mud iron concentrate; the water content of the red mud iron concentrate is ≤8% and the particle size is less than 100 mesh.

[0031] The typical composition of red mud iron concentrate after beneficiation is as follows (mass content %):

[0032] TFe

[0033] (2) The red mud iron fine powder is mixed with a binder that accounts for 1 to 5% by weight of the iron fine powder (the binder is a mixture of lignocellulose and syrup, lignocellulose: syrup = 0.5:0.5), Add 2% to 5% of water, press the ball after mixing, the diameter of the green ball is 12 to 35mm, and the water content is less than 12%;

[0034] (3) After drying, the green ball has a moisture content of less than 5%, and limestone with a particle size of less than 5m...

Example Embodiment

[0045] Example 2: A method for treating iron-containing red mud by a coal-based shaft furnace process, the steps of which are:

[0046] (1) Iron-bearing red mud ore is ground, separated by high gradient magnetic separation, and dried to obtain tailings and red mud iron concentrate; the water content of the red mud iron concentrate is ≤8% and the particle size is less than 100 mesh.

[0047] The typical composition of red mud iron concentrate after beneficiation is as follows (mass content %):

[0048] TFe

[0049] (2) The red mud iron fine powder is mixed with a binder that accounts for 1 to 5% by weight of the iron fine powder (the binder is a mixture of lignocellulose and syrup, lignocellulose: syrup = 0.5:0.5), Add 2% to 5% of water, press the ball after mixing, the diameter of the green ball is 12 to 35mm, and the water content is less than 12%;

[0050] (3) The green ball after drying treatment has a water content of less than 5%, and limestone with a particle size of less tha...

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Abstract

The invention provides a coal-based shaft furnace process for treating iron-containing red mud. Through the coal-based shaft furnace direct reduction process, effective and large-scale comprehensive recycling of iron-containing red mud can be realized, and the production process is advanced and reliable, It can achieve large-scale production, stable product quality, low production cost, high production efficiency and good environmental protection; the metallization rate of the produced sponge iron is ≥90%, and the content of impurities and alkali metals is relatively low, which can be used as electric furnace steelmaking Raw materials, partial replacement of blast furnace oxidized pellets, converter coolant and raw materials for magnetic separation process, etc.

Description

technical field [0001] The invention belongs to the technical field of environmental protection for the comprehensive utilization of red mud resources, and in particular relates to a method for treating iron-containing red mud in a coal-based shaft furnace and its use in comprehensive recovery and utilization of red mud. Background technique [0002] At present, the production of red mud has caused direct and indirect impacts on many aspects of human production and life, so it is imminent to minimize the output and hazards of red mud and realize multi-channel and large-scale resource utilization. [0003] Since red mud is rich in iron resources, the realization of comprehensive recycling of iron-containing red mud resources has important practical significance for alleviating the shortage of iron ore resources in my country. At this stage, the main pretreatment process measures adopted to realize the separation and comprehensive utilization of red mud slag and iron are summa...

Claims

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Application Information

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IPC IPC(8): C22B1/242C21B13/02
CPCC22B1/242C21B13/02C22B1/2406
Inventor 汪朋李建涛周强唐恩陈泉锋
Owner WUHAN COSRED SCI & TECH LTD
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