Method for full resource utilization of red mud

An all-resource, red mud technology, applied in chemical instruments and methods, preparation/treatment of rare earth metal compounds, iron oxide, etc., can solve the problems of large specific surface area, lack, low market acceptance, etc., and achieve simple process and low cost Low, easy mass production effect

Active Publication Date: 2020-10-30
张响
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main problems in the current comprehensive utilization of red mud: (1) Lack of key technologies for large-scale consumption of red mud and industrial competitiveness
Red mud has the characteristics of strong alkalinity, large specific surface area, and interwrapping and intercalation of various components, making it difficult for its comprehensive utilization to learn from some mature processes, technologies and equipment in other fields. Technical support system for large-scale promotion
(2) Lack of corresponding standards and low product market acceptance
Currently, some red mud comprehensive utilization products that have been developed lack the support of national standards or industry standards, such as red mud used as building materials, only by ref

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  • Method for full resource utilization of red mud

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Effect test

Embodiment 1

[0017] A method for full resource utilization of red mud, specifically comprising the following steps:

[0018] 1) Washing red mud to recover sodium hydroxide: After adding water to the red mud in the slag warehouse, it is finely crushed by a disperser and then pumped into the washing system of a CCD thickener. Sodium hydroxide is returned to the aluminum plant for use;

[0019] 2) Concentrated acid rotary kiln stirring and leaching red mud washing slag: According to 0.8 times the molar amount of chemical elements in red mud that can react with sulfuric acid, add 50% sulfuric acid to the rotary kiln with exhaust gas recovery and purification system lined with anti-corrosion ceramic tiles Internal mixing reaction for 1 hour, so that sulfuric acid and red mud are mixed evenly in the rotary kiln. The reaction time is 1-3 hours. After the leaching reaction is completed, the slurry after the reaction is dissolved with water or slag washing liquid, and then the solid-liquid thickene...

Embodiment 2

[0026] A method for full resource utilization of red mud, specifically comprising the following steps:

[0027] 1) Washing red mud to recover sodium hydroxide: After adding water to the red mud in the slag warehouse, it is finely crushed by a disperser and then pumped into the washing system of a CCD thickener. Sodium hydroxide is returned to the aluminum plant for use;

[0028] 2) Concentrated acid rotary kiln stirring and leaching red mud washing slag: According to 1.5 times the molar amount of chemical elements in red mud that can react with sulfuric acid, add 98% sulfuric acid in the rotary kiln with exhaust gas recovery and purification system lined with anti-corrosion ceramic tiles Internal mixing reaction for 3 hours, so that sulfuric acid and red mud are mixed evenly in the rotary kiln. The reaction time is 3 hours. After the leaching reaction is completed, the slurry after the reaction is dissolved with water or slag washing liquid, and then the solid-liquid separatio...

Embodiment 3

[0035] A method for full resource utilization of red mud, specifically comprising the following steps:

[0036] 1) Washing red mud to recover sodium hydroxide: After adding water to the red mud in the slag warehouse, it is finely crushed by a disperser and then pumped into the washing system of a CCD thickener. Sodium hydroxide is returned to the aluminum plant for use;

[0037] 2) Concentrated acid rotary kiln stirring and leaching red mud washing slag: According to 1.2 times the molar amount of chemical elements in red mud that can react with sulfuric acid, add 80% sulfuric acid in the rotary kiln with exhaust gas recovery and purification system lined with anti-corrosion ceramic tiles Internal mixing reaction for 2 hours, so that sulfuric acid and red mud are mixed evenly in the rotary kiln, the reaction time is 2 hours, after the leaching reaction is completed, the slurry after the reaction is dissolved with water or slag washing liquid, and then the solid-liquid separatio...

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Abstract

The invention relates to a method for full resource utilization of red mud. The method for full resource utilization of the red mud specifically comprises the following steps of 1) washing the red mudto recover sodium hydroxide; 2) stirring and leaching out red mud washing residues in a concentrated acid rotary kiln; 3) using the leaching residues obtained in the step 2) for producing sodium silicate and building ceramsite; 4) adjusting the pH value of a leaching solution by using liquid ammonia or ammonia water to precipitate aluminum ammonium sulfate; 5), precipitating an aluminum ammoniumsulfate solution to produce iron oxide red; 6) enriching scandium, vanadium, titanium and gallium through ion exchange; and 7) carrying out MVR evaporative crystallization of ammonium sulfate. The method for full resource utilization of the red mud has the advantages that the pigment-grade iron oxide red with bright color can be obtained without calcining the produced iron oxide red, large-particle smelting-grade aluminum oxide and artificial cryolite can be produced, industrial-grade pure oxides of titanium, scandium, vanadium, gallium, rhenium and rare earth can be produced, full resource recovery of the red mud can be truly realized, the process is simple, the cost is low, and large-scale production is easy.

Description

technical field [0001] The invention relates to a method for recovering high-purity alumina, iron oxide, scandium, vanadium, titanium, gallium and rare earth elements from red mud. Background technique [0002] Red mud is a very fine-grained strong alkaline solid waste produced during the production of alumina from bauxite. For every ton of alumina produced, about 0.8-1.5 tons of red mud are produced. my country is a big producer of alumina. In 2009, it produced 23.78 million tons of alumina, accounting for about 30% of the world's total output, and produced nearly 30 million tons of red mud. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 200 million tons. With the annual increase of alumina production in my country and the gradual decrease of bauxite grade, the annual production of red mud will continue to increase. It is estimated that by 2015, the cumulative stockpiling of red mud will reach ...

Claims

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Application Information

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IPC IPC(8): B09B3/00C01C1/24C01D1/42C01F7/76C01F17/13C01F17/17C01F17/212C01G49/06C04B18/04C07C51/41C07C55/07
CPCB09B3/00C01D1/42C01G49/06C01C1/24C01F7/765C01F17/212C01F17/13C01F17/17C04B18/0418C07C55/07C07C51/41B09B3/80B09B3/20B09B3/40Y02W30/91
Inventor 张响张会周建忠赖曾敏覃冬梅
Owner 张响
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