A comprehensive utilization method of red mud

A technology of red mud and hydrochloric acid, applied in the removal of solid waste, chlorine/hydrogen chloride, alumina/aluminum hydroxide, etc., can solve problems such as environmental hazards and environmental pollution, and achieve comprehensive utilization of resources and remarkable effects of environmental protection.

Active Publication Date: 2015-02-11
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the discharged red mud also contains a certain amount of alkali. Even if effective anti-seepage measures are taken, it is still potentially harmful to the environment. Moreover, some alumina production enterprises have not taken effective anti-seepage measures, which will inevitably pollute the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition of raw red mud is: Al 2 o 3 :34.5%, SiO 2 :23.8%, Fe 2 o 3 :6.9%, Na 2 O: 12.5%. The composition of the raw red mud can also adopt other components and specific dosage, which cannot be used to limit the protection scope of the present invention.

[0023] Take 1000g of the above red mud, dry grind the red mud, add 36% hydrochloric acid into the hydrochloric acid resistant reaction kettle and mix with the red mud, the sum of alumina, iron oxide and sodium oxide in the red mud is equal to the mole of HCl in hydrochloric acid The ratio is 1:9, heated to 50°C, and the reaction time is 150 minutes. After the reaction cools down, solid-liquid separation and washing are obtained to obtain aluminum chloride, ferric chloride and sodium chloride solutions and high-silicon slag, and the separation of aluminum, iron and silicon is achieved; Sodium hydroxide solution is added to the obtained solution to obtain aluminum hydroxide and iron hydroxide precipitation ...

Embodiment 2

[0025] Take 1000g of the red mud used in Example 1, dry the red mud ore, add 5% hydrochloric acid into the hydrochloric acid-resistant reaction kettle and mix with the red mud, the sum of aluminum oxide, iron oxide and sodium oxide in the red mud is equal to The molar ratio of HCl in hydrochloric acid is 1:7, heated to 180°C, and the reaction time is 150 minutes. After the reaction cools down, solid-liquid separation and washing are obtained to obtain solutions of aluminum chloride, ferric chloride, and sodium chloride and high-silicon slag to realize aluminum-iron Separation from silicon; add sodium hydroxide solution to the obtained solution to obtain aluminum hydroxide and iron hydroxide precipitation and sodium chloride solution, and then perform solid-liquid separation and washing; the obtained aluminum hydroxide and iron hydroxide solids are subjected to simple Bayer method The process can obtain metallurgical grade alumina and high iron slag. The simple Bayer process inc...

Embodiment 3

[0028] Take 1000g of the red mud used in Example 1, dry the red mud ore, add 25% hydrochloric acid into the hydrochloric acid-resistant reaction kettle and mix with the red mud, the sum of aluminum oxide, iron oxide and sodium oxide in the red mud is equal to The molar ratio of HCl in hydrochloric acid is 1:4, heated to 110°C, and the reaction time is 60 minutes. After the reaction cools down, the solid-liquid separation and washing are obtained to obtain aluminum chloride, ferric chloride and sodium chloride solutions and high-silicon slag, and realize aluminum-iron Separation from silicon; add sodium hydroxide solution to the resulting solution to obtain aluminum hydroxide and iron hydroxide precipitation and sodium chloride solution, and then perform solid-liquid separation and washing; the obtained aluminum hydroxide and iron hydroxide solids are subjected to a simple Bayer method The process can obtain metallurgical grade alumina and high iron slag. The simple Bayer proces...

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PUM

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Abstract

The invention relates to a comprehensive utilization method of bauxite and particularly relates to a comprehensive utilization method of red mud. The method includes: a step of mixing the red mud with hydrochloric acid, adding the mixture into a hydrochloric acid-resistant reactor, and reacting; a step of cooling after the reaction is finished, performing solid liquid separation and washing; a step of adding the obtained solution into a sodium hydroxide solution to obtain an aluminium hydroxide precipitate, an iron hydroxide precipitate and a sodium chloride solution, performing solid liquid separation, and washing; a step of preparing the aluminium hydroxide and iron hydroxide solid into metallurgy-level aluminum oxide and high-iron slag through a simple Bayer process; a step of subjecting the sodium chloride solution to electrolysis by an ionic exchange membrane electrolytic cell to obtain hydrogen, chlorine and a sodium hydroxide solution; a step of returning the sodium hydroxide solution discharged from an ionic membrane cathode zone and recycling; and a step of returning and recycling the obtained hydrogen and the obtained chlorine. The method is obvious in environment protection effects, effectively separates aluminum, iron and silicon in the red mud, and recovers the aluminum, the iron, sodium and other useful elements, thus achieving comprehensive utilization.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of bauxite, in particular to a method for comprehensive utilization of red mud. Background technique [0002] Alumina industry is one of the basic raw material industries in my country. my country's alumina industry started in 1953 with the first alumina plant (Shandong Aluminum Plant) with a designed annual output of 35,000 tons. The output reached 28.95 million tons, ranking first in the world both in terms of production capacity and output. [0003] my country's proven bauxite resources rank sixth in the world, and the top five are: Guinea, Australia, India, Vietnam, and Brazil. The bauxite in my country is mainly diaspore type bauxite (accounting for more than 98%), and the bauxite in foreign countries is mostly gibbsite type bauxite, and some boehmite type bauxite Bauxite. Most of the bauxite in my country is high-alumina and high-silicon bauxite. At present, the bauxite Al 2 o 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01B7/01B09B3/00
CPCB09B3/00C01B7/01C01F7/02
Inventor 李来时
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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