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Calcified-carbonized high-iron red mud recycling iron and tailings cementation method

A technology for carbonizing high-speed iron and recovering iron, applied in cement production, reducing gas emissions, etc., can solve the problems of unutilized tailings, low product price, and long processing process, and achieves sufficient reduction kinetics conditions and monomers. High degree of dissociation, the effect of promoting mass transfer process

Inactive Publication Date: 2019-07-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When red mud is used as a general industrial raw material as a whole, there are problems such as red mud alkali restriction, low product price, and poor income; most of the methods for separately extracting valuable elements have too long treatment process, large amount of waste water, and tailings cannot be obtained Use and other issues

Method used

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  • Calcified-carbonized high-iron red mud recycling iron and tailings cementation method
  • Calcified-carbonized high-iron red mud recycling iron and tailings cementation method

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Embodiment 1

[0044] A method for calcification-carbonized high-speed iron red mud recovery iron and tailings cementation, comprising the following steps:

[0045] The raw material calcified-carbonized high iron red mud includes components and mass percentages: TFe content is 30%, Al 2 O 3 Content at 12%, SiO 2 Content at 20%, Na 2 O content at 0.5%, H 2 O content 10%;

[0046] (1) dehydrating and drying the calcified-carbonized high-speed iron red mud to a moisture content of less than 1% to obtain dried red mud, and grinding the dried red mud and slag-forming agent mixture to a 0.2mm sieve and remaining 4% to form a mixture, The mixture is directly injected into the vortex center of the vortex stirring melting reduction high temperature furnace without sintering and is drawn into the molten pool. The slag-forming agents are CaO and CaF. 2 The mixture, CaO is added according to the basicity of the mixture is 1.4, CaF 2 The mass is added by 20% of the mass of CaO;

[0047] (2) Vortex...

Embodiment 2

[0051] A method for calcification-carbonized high-speed iron red mud recovery iron and tailings cementation, comprising the following steps:

[0052] The raw material calcified-carbonized high iron red mud includes components and mass percentages: TFe content is 30%, Al 2 O 3 Content at 12%, SiO 2 Content at 20%, Na 2 O content at 0.5%, H 2 O content 10%;

[0053] (1) dehydrating and drying the calcified-carbonized high iron red mud to a moisture content of less than 1% to obtain dried red mud, and grinding the dried red mud and slag-forming agent mixture to a 0.2mm sieve and remaining 1% to form a mixture, The mixture is directly injected into the vortex center of the vortex stirring melting reduction high temperature furnace without sintering and is drawn into the molten pool. The slag-forming agents are CaO and CaF. 2 The mixture, CaO is added according to the alkalinity of the mixture is 1.0, CaF 2 The mass is added by 30% of the mass of CaO;

[0054] (2) Vortex sti...

Embodiment 3

[0058] A method for calcification-carbonized high-speed iron red mud recovery iron and tailings cementation, comprising the following steps:

[0059] The raw material calcified-carbonized high iron red mud includes components and mass percentages as follows: TFe content is 20%, Al 2 O 3 Content at 8%, SiO 2 Content at 12%, Na 2 O content at 0.4%, H 2 O content 13%;

[0060] (1) dehydrating and drying the calcified-carbonized high-speed iron red mud to a moisture content of less than 1% to obtain dried red mud, and grinding the dried red mud and slag-forming agent mixture to a 0.2mm sieve and remaining 2% to form a mixture, The mixture is directly injected into the vortex center of the vortex stirring melting reduction high temperature furnace without sintering and is drawn into the molten pool. The slag-forming agents are CaO and CaF. 2 The mixture, CaO is added according to the basicity of the mixture is 1.2, CaF 2 The mass is added by 10% of the mass of CaO;

[0061] ...

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Abstract

The invention relates to a calcified-carbonized high-iron red mud recycling iron and tailings cementation method which comprises the process steps of (1) drying and dewatering high-iron red mud treated through a calcification-carbonization method; (2) grinding a slag former and red mud mixture, directly spraying and blowing to a vortex center of a vortex stirring smelting reduction high-temperature furnace without sintering, and rolling into a molten pool; (3) carrying out vortex stirring in the molten pool at 1300 to 1600 DEG C, and meanwhile, feeding a gas-state reducing agent for reducing for 10 to 60min; (4) obtaining reduced molten iron and a melted slag, and carrying out overflow separation; (5) adding ferrochrome and ferromanganese into the molten iron, and smelting into wear-resisting cast iron; (6) adjusting compositions of the melted slag in the vortex stirring high-temperature furnace so as to enable the melted slag to meet the cement requirement; and (7) cooling, crushing and grinding the melted slag so as to directly obtain a cement clinker. According to the calcified-carbonized high-iron red mud recycling iron and tailings cementation method provided by the invention,the utilization rate of the red mud is 100 percent, and the extraction rate of the iron is more than 90 percent.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of environmental protection, and in particular relates to a method for recovering iron from calcified-carbonized high-speed iron red mud and cementing tailings. [0003] Background technique: [0004] Red mud is a strong alkaline solid waste produced after the production of alumina or aluminum hydroxide from bauxite. At present, the global red mud reserves are estimated to have exceeded 3 billion tons, and the annual growth rate is about 120 million tons. The average utilization rate of red mud in the world is 15%. The accumulative stockpile of red mud in China has grown to 600 million tons, and the annual growth rate is about 100 million tons. The utilization rate of red mud in China is only 4%. Most of the red mud is still disposed of on land. Red mud storage not only wastes secondary resources and occupies a large amount of land, but also destroys the surrounding environment of the red mud storag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C04B7/147
CPCC04B7/147C21B13/0006C21B13/0073Y02P10/143Y02P40/10
Inventor 张廷安刘燕王艳秀牛丽萍豆志河吕国志王坤赵秋月傅大学张伟光韩继标郭军华晁曦
Owner NORTHEASTERN UNIV
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