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A kind of recovery method of red mud

A recovery method and technology of red mud, which is applied in the field of red mud recovery, can solve the problems of complex residual impurities, difficult treatment and application of red mud, insufficient utilization rate, etc., and achieve the effects of low cost, time saving and improved utilization rate

Inactive Publication Date: 2019-05-03
贵州省过程工业技术研究中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex composition of residual impurities and problems such as encapsulation, alkalinity, and radioactivity, red mud is difficult to process and apply. The current treatment methods all have the difficulties of insufficient utilization rate, high cost, and complicated process.

Method used

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  • A kind of recovery method of red mud
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A red mud recovery and reuse method specifically includes the following steps:

[0044] (1) select red mud;

[0045] (2) Quantitatively put the selected red mud into the crucible of the chain furnace, add sodium hydroxide twice the weight of the red mud, and mix;

[0046] (3) Heat the crucible from room temperature to 1600°C (it is beneficial to discharge the water in the attached liquid to protect the crucible), and then cool it naturally to room temperature in a chain furnace;

[0047] (4) Take the crucible out of the chain furnace, put it into boiling water at 100°C, dissolve the materials in the crucible in water, and dissolve all the lumps in the pot in water to form a suspension;

[0048] (5) Pass the suspended matter through the magnetic separation equipment, wash and dry the magnetic substances in the magnetic separation equipment, and obtain iron ore, which can be directly smelted or sold; the suspension after magnetic separation is dried, and can be used as t...

Embodiment 2

[0050] A red mud recovery and reuse method specifically includes the following steps:

[0051] (1) Select red mud or red mud and its attached liquid;

[0052] (2) Put the selected red mud or red mud and its attached liquid quantitatively into the crucible of the chain furnace, add sodium hydroxide 10 times the weight of the red mud, and mix;

[0053] (3) Heat the crucible from room temperature to 900°C, which is beneficial to discharge the water in the attached liquid to protect the crucible, and then naturally cool to room temperature in a chain furnace;

[0054] (4) Take the crucible out of the chain furnace, put it into boiling water at 90°C, and dissolve all the materials in the crucible in the water to form a suspension;

[0055] (5) Pass the suspended matter through the magnetic separation equipment, wash and dry the magnetic substances in the magnetic separation equipment, and obtain iron ore, which can be directly smelted or sold; the suspension after magnetic separat...

Embodiment 3

[0057] A red mud recovery and reuse method specifically includes the following steps:

[0058] (1) Select red mud and its attached liquid;

[0059] (2) Quantitatively put the selected red mud and its attached liquid into the crucible of the chain furnace, add sodium hydroxide 6 times the weight of the red mud, and mix;

[0060] (3) Heat the crucible from room temperature to 1300°C (it is beneficial to discharge the water in the attached liquid to protect the crucible), and then naturally cool to room temperature in a chain furnace;

[0061] (4) Take the crucible out of the chain furnace, put it into boiling water at 98°C, dissolve the materials in the crucible in water, and dissolve all the lumps in the pot in water to form a suspension;

[0062](5) Pass the suspended matter through the magnetic separation equipment, wash and dry the magnetic substances in the magnetic separation equipment, and obtain iron ore, which can be directly smelted or sold; the suspension after magne...

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Abstract

The invention discloses a method for recovering red mud. The red mud is mixed with sodium hydroxide, heated, and after the red mud is melted, cooled to room temperature, dissolved in boiling water, magnetically separated from the suspension, washed and dried with magnetic substances to obtain refined iron ore, and at the same time dry the suspension after magnetic separation to obtain thermal insulation and flame retardant materials. The method reuses the red mud to obtain iron concentrate and heat-preserving and flame-retardant materials, thereby improving the utilization rate of the red mud. It is simple and feasible, and provides a new idea for the economical and effective treatment of Bayer process red mud, enabling my country's alumina industry to obtain greater economic and social benefits.

Description

technical field [0001] The invention relates to a red mud recovery method, in particular to a red mud recovery method with simple process, low cost and high utilization rate. Background technique [0002] Red mud, also known as red mud, is the polluting waste discharged from the aluminum industry when extracting alumina. Generally, for every ton of alumina produced, 1 to 2 tons of red mud are incidentally produced. As the fourth largest producer of alumina in the world, China discharges millions of tons of red mud every year. A large amount of red mud cannot be fully and effectively utilized, and can only be stacked in a large area of ​​storage yard, which occupies a large amount of land and causes serious pollution to the environment. The red mud produced in the world is about 70 million tons every year, and the red mud produced in my country is more than 30 million tons every year. The production of a large amount of red mud has caused direct and indirect impacts on huma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B3/40
Inventor 陈俊良苏向东李勇丁元法林齐李桂兰
Owner 贵州省过程工业技术研究中心