High-iron red mud strong-magnetic preseparation-suspension-state direct reduction-high-temperature melting separation method

A high-speed iron red mud, strong magnetic technology, applied in the fields of magnetic separation, chemical instruments and methods, solid separation, etc., can solve the problems of occupying land, wasting resources, environmental pollution and safety hazards, saving energy, improving product quality, The effect of large reaction contact area

Inactive Publication Date: 2019-11-29
辽宁东大矿冶工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily causes environmental pollution and safety hazards

Method used

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  • High-iron red mud strong-magnetic preseparation-suspension-state direct reduction-high-temperature melting separation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, a certain high-iron red mud containing TFe 32.04% by weight percentage, Al 2 o 3 15.78%, SiO 2 9.47%, high-iron red mud strong magnetic pre-selection-suspension state direct reduction-high temperature melting method such as figure 1 shown, follow the steps below:

[0030] (1) Firstly, a section of wet strong magnetic separation is used for magnetic separation of red mud, and the magnetic field strength of magnetic separation is 636.62kA / m to obtain magnetic separation concentrate and magnetic separation tailings; the iron grade of magnetic separation concentrate is 44.68%, SiO 2 The quality score is 4.60%;

[0031] (2) The magnetic separation concentrate is directly reduced in a suspension state at a temperature of 900° C. for 60 minutes, and part of the iron oxides are reduced to metallic iron; the metallization rate of iron after the magnetic separation concentrate is reduced and roasted is 90.91%;

[0032] (3) Add lime and mix the high-temper...

Embodiment 2

[0036] In this embodiment, a certain high-iron red mud containing TFe 35.40% by weight percentage, Al 2 o 3 18.85%, SiO 2 7.09%. Method is the same as embodiment 1 and figure 1 , the difference is:

[0037] (1) The magnetic field strength of wet magnetic separation is 716.19kA / m; the iron grade of magnetic separation concentrate is 46.64%, SiO 2 The content is 3.09%;

[0038] (2) The suspension state direct reduction temperature is 1000°C, and the time is 50 minutes; the metallization rate of iron after the pre-selected concentrate is reduced and roasted is 91.05%;

[0039] (3) The reduction temperature of the deep reduction furnace is 1300°C; the reduction time of molten iron is 40 minutes, and the amount of lime added is n(CaO) / n(Al 2 o 3 )=1.85, the amount percentage contains Fe 92.03%, C 3.68%, P 0.03%, S 0.02%, Si0.43%;

[0040] (4) The concentration of sodium carbonate solution used for leaching is 85g / L, the leaching temperature is 75°C, the leaching time is 95 ...

Embodiment 3

[0043] In this embodiment, a certain high-iron red mud containing TFe 30.80% by weight percentage, Al 2 o 3 19.69%, SiO 2 8.68%. Method is with embodiment 1, and difference is:

[0044] (1) The magnetic field strength of wet magnetic separation is 795.77kA / m; the iron grade of magnetic separation concentrate is 42.06%, SiO 2 The mass fraction is 4.59%.

[0045] (2) Suspension state direct reduction temperature is 800 ℃, and time is 40min; the metallization rate of iron after reduction roasting of preselected concentrate is 93.78%;

[0046] (3) The reduction temperature of the deep reduction furnace is 1350°C, the time is 50min, and the amount of lime added is n(CaO) / n(Al 2 o 3 )=1.95,; molten iron contains Fe 93.15%, C 3.88%, P 0.03%, S 0.02%, Si0.35% by mass percentage;

[0047] (4) The concentration of sodium carbonate solution used for leaching is 100g / L, the leaching temperature is 85°C, the leaching time is 105 minutes, the liquid-solid ratio is 9:1; the alumina lea...

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Abstract

The invention discloses a high-iron red mud strong-magnetic preseparation-suspension-state direct reduction-high-temperature melting separation method. Firstly, a section of wet strong-magnetic separation is adopted to preseparate red mud; preseparated concentrates are directly reduced in a suspension state; part of iron oxides are reduced as metal iron; lime is fed in direct-reduced high-temperature materials for uniform mixing, and is directly fed in a deep reduction furnace; iron minerals are totally reduced as the metal iron; meanwhile, burdens are molten; and slag is totally separated from iron. The method can effectively recover iron and aluminum; the recovery rate of iron is higher than 96%; and the leaching rate of aluminum oxide is higher than 90%.

Description

technical field [0001] The invention relates to the technical fields of mineral processing and metallurgy, in particular to a method of high-iron red mud strong magnetic pre-selection-suspension state direct reduction-high temperature melting. Background technique [0002] Red mud is industrial solid waste discharged during the alumina production process. Red mud contains a certain amount of iron and aluminum. Due to the huge stockpile, the total amount of valuable elements it contains is also very considerable. At present, my country's annual red mud discharge exceeds 70 million tons, and the accumulated red mud stockpile exceeds 352 million tons. With the annual increase of alumina production in my country and the gradual decrease of bauxite grade, the annual production of red mud will continue to increase. [0003] A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily causes environmental pollution and potential safety haz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/10C21B11/00C22B21/00B03C1/02
CPCB03C1/02C21B11/00C22B1/10C22B7/008C22B21/0007C22B21/0023Y02P10/20
Inventor 韩跃新高海啸余建文李艳军吕扬
Owner 辽宁东大矿冶工程技术有限公司
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