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Process and device for separating iron and aluminum silica slag from red mud and removing alkali metal

A technology for separating aluminum-silicon slag and iron, which is applied in the field of iron and steel metallurgy, can solve the problems of environmental pollution, red mud stockpiles that cannot be comprehensively utilized in large quantities, etc., to solve pollution problems, have significant economic and social benefits, and low production costs Effect

Inactive Publication Date: 2012-05-23
董亚飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies of the existing technology and the fact that hundreds of millions of tons of red mud stocks cannot be comprehensively utilized in large quantities and cause environmental pollution, the present invention proposes a process for separating iron, aluminum-silicon slag and alkali metal removal from red mud and Equipment, a set of equipment can process 300,000 to 800,000 tons of red mud per year

Method used

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  • Process and device for separating iron and aluminum silica slag from red mud and removing alkali metal
  • Process and device for separating iron and aluminum silica slag from red mud and removing alkali metal
  • Process and device for separating iron and aluminum silica slag from red mud and removing alkali metal

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Embodiment 1

[0038] The process equipment for separating iron, aluminum-silicon slag and alkali metal removal from red mud of the present invention, such as figure 1 As shown, it includes a mixer 1, a briquette machine 2, a chain grate machine 3, a rotary hearth furnace 6, a cooling machine 7, a magnetic separation system, a waste heat utilization system, and a gas system.

[0039] Mixer 1, briquetting machine 2 are connected to chain grate machine 3 in turn, chain grate machine 3 is connected to material distribution port 4 on the top of rotary hearth furnace 6, and cooling machine 7 is connected to discharge port 5 on one side of rotary hearth furnace 6.

[0040] The magnetic separation system includes: a crusher 8, a magnetic separation device 9, a ball mill 10, and a strong magnetic separation device 11. Cooler 7, Crusher 8, Magnetic Separation Equipment 9, Ball Mill 10, Strong Magnetic Separation Equipment 11 are connected in sequence, the water-cooled pressurized balls are crushed in...

Embodiment 2

[0047] The used red mud of the present invention, its composition is: Fe 2 o 3 : 68%, SiO 2 : 6.2%, Al 2 o 3 : 9.3%, TiO2: 3.1%, MnO: 0.15%, Na2O: 3.1%, CaO: 2.8%, K 2 O: 0.25%, MgO: 0.15%, S: 0.015%, P: 0.025%, moisture 6.91%. The fixed carbon of pulverized coal is more than 77%, and the sulfur is less than 1%. The combustion gas of the rotary hearth furnace is producer gas.

[0048] Red mud, coal powder, lime and binder are added to the mixer (1) in the ratio of red mud: coal powder: lime: binder = 1: 0.25: 0.05: 0.03 and mixed evenly. Press out a 30mm ball.

[0049] The waste gas from the rotary hearth furnace is preheated to 900°C by the preheating equipment, and then mixed with 30% oxygen (oxygen content greater than 90%) through the oxygen-enriched mixing equipment 19 to generate oxygen-enriched hot air with a temperature of 800°C. Use gas generator 21 to generate coal gas and 800°C oxygen-enriched hot air combustion rotary hearth furnace. 2 : 0.09%, Al 2 o 3 ...

Embodiment 3

[0051] The process equipment for separating iron, aluminum-silicon slag and alkali metal from red mud of the present invention includes: 23: natural gas tank, 24: natural gas pipeline, see figure 2 , and all the other equipment are the same as in Example 1.

[0052] The used red mud of the present invention, its composition is: Fe 2 o 3 : 40%, SiO 2 : 9.5%, Al 2 o 3 : 13.3%, TiO 2 : 8.7%, MnO: 0.09%, Na 2 O: 8.5%, CaO: 4.5%, K 2 O: 0.356%, MgO: 0.20%, S: 0.03%, P: 0.035%, moisture 14.78%. The fixed carbon of pulverized coal is more than 77%, and the sulfur is less than 1%. The combustion gas of the rotary hearth furnace is natural gas.

[0053] Red mud, coal powder, lime and binder are added to the mixer (1) in the ratio of red mud: coal powder: lime: binder = 1: 0.19: 0.10: 0 and mixed evenly. Press out a 30mm ball.

[0054] The temperature in the reduction section of the rotary hearth furnace reaches 1450°C, and the composition of iron selected after smelting red...

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Abstract

The invention relates to a process and device for separating iron and aluminum silica slag from red mud and removing alkali metal. The process comprises the following steps: uniformly mixing red mud, coal powder, lime and an adhesive according to a certain ratio, compressing into balls, drying, melting and reducing in a rotary hearth furnace, crushing, and magnetically separating iron and aluminum silica slag, wherein the separated iron can be used for electric steelmaking, steel casting or the like, and the aluminum silica slag can be used for producing high-grade high-quality cement or be used as the raw material of refractory materials. Thus, the invention realizes the comprehensive utilization of the red mud, saves the land, achieves the advantages of energy saving and emission reduction and has favorable economic, environmental and social benefits.

Description

technical field [0001] The invention relates to a production process of iron, in particular to a process and equipment for separating iron, aluminum-silicon slag and alkali metal from red mud, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] Red mud is the solid waste produced during the extraction of alumina from bauxite. Due to different mineral sources and refining methods, at present, for every ton of alumina produced in my country, about 1 to 2 tons of red mud are produced. The red mud discharged after alumina extraction by Bayer method is widely used, and its main components are: Fe2O3: 40-70%, SiO2: 7-12%, Al2O3: 9-18%, TiO2: 3-9%, Na2O: 3 ~11%, CaO: 1~3%, Mn: 0.05~0.15%, K2O: 0.2~0.4%, MgO: 0.15~0.50%, S: 0.02~0.12%, P: 0.02~0.06%, moisture 5~ 15%. At present, the stockpiling of red mud in my country has reached 200 million tons, and it is estimated that the stockpiling of red mud will reach 350 million tons in 2015. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C22B1/14C22B7/00
CPCY02P10/143Y02P10/20
Inventor 董亚飞
Owner 董亚飞