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A kind of comprehensive treatment method of red mud and boron mud

A technology of comprehensive treatment and boron mud, applied in the field of comprehensive treatment of red mud and boron mud, can solve the problems of low melting point of red mud, inability to reduce iron elements, low boron mud, etc. The effect of promoting iron reduction

Active Publication Date: 2017-05-10
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies existing in the prior art in the art, the purpose of the present invention is to propose a red mud treatment method to solve (1) the red mud cannot be aggregated due to the finer particles in the reduction process, (2) due to the boron mud The iron content is low, and it is difficult to extract iron alone. (3) Red mud has a low melting point during the reduction process, and it cannot reduce iron elements at high temperatures, etc.

Method used

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  • A kind of comprehensive treatment method of red mud and boron mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A Bayer process smelting red mud, its composition is: TFe 35.28%; a certain boron mud, its composition is: TFe15.21%, B 2 o 3 3.68%. The raw materials are mixed according to the weight ratio of red mud: boron mud: reducing agent: sodium carbonate = 100:10:20:1. After mixing, use a pair of roller briquettes to briquette. The dry and wet ball drop strength of the pellets are both greater than 10. Second-rate.

[0042] After the pressed pellets are dried, reduction roasting is carried out at a roasting temperature of 1280°C. The pellets reacted at high temperature do not melt or bond, and metallized pellets are obtained with a metallization rate of 90.2%. The pellets are subjected to grinding and magnetic separation to finally obtain 91.12% metal iron powder with an iron recovery rate of 88%.

Embodiment 2

[0044]A smelting red mud, its composition is: TFe 31.32%; a certain boron mud, its composition is: TFe15.21%, B 2 o 3 3.68%. The raw materials are mixed according to the weight ratio of red mud: boron mud: reduced coal: sodium carbonate = 100:12:25:2. After mixing, the pellets are pressed into balls. The dry and wet ball drop strengths of the pellets are both greater than 8 times.

[0045] After the pressed pellets are dried, reduction roasting is carried out at a roasting temperature of 1300°C. The pellets after the reaction at high temperature do not melt and stick together. The obtained metallized pellets have a metallization rate of 92.1%, and the pellets are subjected to grinding and magnetic separation to finally obtain 91.56% metallic iron powder with an iron recovery rate of 90%.

Embodiment 3

[0047] A smelting red mud, its composition is: TFe 35.28%; a certain boron mud, its composition is: TFe18.59%, B 2 o 3 3.06%. The raw materials are mixed according to the weight ratio of red mud: boron mud: reduced coal: sodium carbonate = 100:30:23:2. After mixing, the pellets are briquetted. The pressure of the briquetting machine is 3MP. More than 7 times.

[0048] After the pressed pellets are dried, reduction roasting is carried out at a roasting temperature of 1300°C. The pellets after the reaction at high temperature do not melt and stick together. The obtained metallized pellets have a metallization rate of 92.8%, and the pellets are subjected to grinding and magnetic separation to finally obtain 92.32% metal iron powder, and the iron recovery rate is 93%.

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Abstract

The invention provides a comprehensive treatment method for red mud and boron mud. The comprehensive treatment method comprises the steps that 1, the red mud, the boron mud, a reducing agent and sodium carbonate are mixed in proportion, so that a mixed material is obtained; 2, calcination is conducted; 3, after cooling, the material is crushed and ground finely, magnetic separation is conducted, and finally metallic iron powder and tailings are obtained. By the adoption of the comprehensive treatment method for the red mud and the boron mud, the problems that iron particles in red mud are fine, it is difficult to gather the iron particles after reduction, the grade of the ground and separated iron is low, and the iron recovery rate is low are solved; because the boron mud and the sodium carbonate are added, part of the sodium carbonate and boron in the boron mud react to generate sodium tetraborate, and the iron particles in the red mud are promoted to gather and become larger. Because the main element, forsterite, in the boron mud has a quite high melting point, the melting point of a mixed pellet can be raised, the calcination temperature is raised, and iron is promoted to restore.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a comprehensive treatment method for red mud and boron mud. Background technique [0002] Red mud is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud. With the continuous development of the aluminum industry, the world currently produces about 60 million tons of red mud every year, and my country's red mud discharge is more than 4.5 million tons per year. Most alumina refineries in the world pile up or dump red mud into the deep sea. Red mud contains a large amount of iron, aluminum, sodium, calcium and other metals. The stockpiling of red mud not only takes up a lot of land and farmland, but also consumes a lot of yard construction and maintenance costs, causing serious water pollution and wasting a lot of waste. metal resources. Valuable metal components contained in red mud such as Fe 3 o 4 、Al 2 o 3 、Na ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C01B35/12
CPCY02P10/20
Inventor 王敏古明远刘占华王欣曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST