Method for recovering iron, aluminum and sodium from Bayer process red mud

A Bayer process red mud and iron recovery technology, applied in the field of metallurgy, can solve the problems of inability to carry out industrialization and application, low overall metal recovery rate, single variety of metal elements, etc. low effect

Inactive Publication Date: 2021-04-06
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the single variety of valuable metal elements recovered from red mud in the prior art, the process route is not scientific enough, the alkali consumption is high, the overall recovery rate of metals is not high, and the red mud recycling rate is low so that industrialization cannot be carried out. Disadvantages of popularization and application, providing an effective method for comprehensive recovery of iron, aluminum and sodium from red mud

Method used

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  • Method for recovering iron, aluminum and sodium from Bayer process red mud
  • Method for recovering iron, aluminum and sodium from Bayer process red mud
  • Method for recovering iron, aluminum and sodium from Bayer process red mud

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Embodiment 1

[0042] This embodiment relates to a method for comprehensively recovering iron, aluminum and sodium from Bayer process red mud, comprising the following steps:

[0043] S1. Pretreatment: Mix the dried red mud fine powder with activated carbon, magnesium oxide and soda ash evenly.

[0044] According to Al in red mud 2 o 3 The content determines the Na 2 The amount of substance of O, the value range is Na 2 O / Al 2 o 3 Molar ratio is 0.9, then Na 2 The amount of substance of O is converted into the amount of soda ash added,

[0045] According to SiO in red mud 2 The content determines the amount of MgO substance, and the value range is MgO / SiO 2 The molar ratio is 1.8:1,

[0046] According to Fe in red mud 2 o 3 The content of C determines the amount of C, and the amount added is based on C / Fe 2 o 3 The molar ratio is 1.5 and an excess of 25%, and the amount of activated carbon added is calculated according to the amount of C.

[0047] Afterwards, it was ball milled...

Embodiment 2

[0053] This embodiment relates to a method for comprehensively recovering iron, aluminum and sodium from Bayer process red mud, comprising the following steps:

[0054] S1, pretreatment: the dried red mud fine powder and graphite powder, MgCO 3 and NaHCO 3 well mixed,

[0055] According to Al in red mud 2 o 3 The content determines the Na 2 The amount of substance of O, the value range is Na 2 O / Al 2 o 3 Molar ratio is 0.95, then Na 2 The amount of O substance is converted to NaHCO 3 the added amount,

[0056] According to SiO in red mud 2 The content determines the amount of MgO substance, and the value range is MgO / SiO 2 The molar ratio is 1.6:1, and then convert the amount of MgO into MgCO 3 the added amount,

[0057] According to Fe in red mud 2 o 3 The content of C determines the amount of C, and the amount added is based on C / Fe 2 o 3 The molar ratio is 2.5 and an excess of 15%, and the amount of graphite powder added is calculated according to the amoun...

Embodiment 3

[0064] This embodiment relates to a method for comprehensively recovering iron, aluminum and sodium from Bayer process red mud, comprising the following steps:

[0065] S1. Pretreatment: Mix the dried red mud fine powder with anthracite, magnesite and soda ash evenly,

[0066] According to Al in red mud 2 o 3 The content determines the Na 2 The amount of substance of O, the value range is Na 2 O / Al 2 o 3 The molar ratio is 1, and Na 2 The amount of O substance is converted to the added amount of sodium-containing compound,

[0067] According to SiO in red mud 2 The content determines the amount of MgO substance, and the value range is MgO / SiO 2 The molar ratio is 1.3:1, and then the amount of MgO is converted into the amount of magnesite added,

[0068] According to Fe in red mud 2 o 3 The content of C determines the amount of C, and the amount added is based on C / Fe 2 o 3 The molar ratio is 2.0 and an excess of 10%, and the amount of anthracite added is calculate...

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Abstract

The invention relates to the field of metallurgy, in particular to a method for comprehensively recovering iron, aluminum and sodium from Bayer process red mud. The method mainly comprises the following steps of proportionally mixing and briquetting the red mud, a specific mineralizing agent and a specific reducing agent, carrying out high-temperature reduction magnetization and salinization roasting, carrying out magnetic separation on a roasted product, and conducting leaching with a dilute alkali solution. According to the method, iron ore concentrates and sodium aluminate solutions are finally separated from the red mud, the iron ore concentrates can be used as a steelmaking raw material, and the sodium aluminate solutions can return to an aluminum oxide factory to further recover aluminum oxide; according to the method, a magnetic iron phase, a soluble aluminum phase and sodium phase and an insoluble silicon phase are high in conversion rate during roasting, the comprehensive recovery rate of the iron, the aluminum and the sodium is high, and titanium is enriched in recovered residues; and the method is a red mud comprehensive recovery method with popularization value.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for recovering iron, aluminum and sodium from red mud. Background technique [0002] The industrial waste produced during the production of alumina, due to Fe 3+ The content is high, so it is red, and it is called "red mud", which has become the largest non-ferrous metallurgical waste residue. Bayer process red mud is the waste slag produced by Bayer process for alumina production, which can be used as raw material for the production of building materials, but its application is limited due to its high alkali content, and its utilization rate is very low. The ecological environment poses a serious threat. [0003] Bayer process red mud has the characteristics of high content of iron, aluminum and sodium. The oxide content of these three elements usually accounts for 55-70% of the total weight of red mud. In addition, it also contains a small amount of titanium, scandium and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B21/00C22B26/10C01F7/06
CPCC22B7/008C22B1/02C22B21/0023C22B26/10C01F7/0693Y02P10/20
Inventor 高锋韦悦周
Owner GUANGXI UNIV
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