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Process for recovering aluminium, iron and scandium from Bayer-process red mud powder

A Bayer red mud and aluminum recycling technology, applied in the direction of improving process efficiency, can solve the problems of polluting soil, air and groundwater, seriously endangering the natural environment, and affecting people's health, so as to achieve recycling, less wastewater discharge, and solution Handle simple effects

Active Publication Date: 2016-04-13
ZUNYI ENERGY & MINERAL INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of red mud is complex, alkaline, easy to alkalinize the land, pollute the soil, air and groundwater, seriously endanger the natural environment, and affect people's health

Method used

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  • Process for recovering aluminium, iron and scandium from Bayer-process red mud powder
  • Process for recovering aluminium, iron and scandium from Bayer-process red mud powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a process for recovering aluminum, iron and scandium from red mud powder by Bayer method, such as figure 1 As shown, the specific steps are:

[0029] 1) Analyze the composition of the Bayer process red mud powder, and measure the content of Al2O3, iron oxide and silicon dioxide in the Bayer process red mud powder;

[0030] 2) Mix the Bayer process red mud powder with sodium carbonate, lime and carbon powder, place the mixed material in a ceramic crucible, and cover with a layer of 3-5mm thick reduced carbon powder (the main function is to isolate and prevent the reactant It will be oxidized again in contact with air), cover the lid and seal it tightly, and the mixing ratio of red mud powder, sodium carbonate, lime and reducing carbon powder should meet: the amount of sodium carbonate added (molar ratio) [Na 2 CO 3 ] / [Al 2 o 3 ]=1~1.1, the amount of lime added (molar ratio) [CaO] / [SiO 2 ] = 1.8 ~ 2, the amount of carbon powder added (mass ra...

Embodiment 2

[0043] This embodiment provides a process for recovering aluminum, iron and scandium from red mud powder by Bayer method, such as figure 1 As shown, the specific steps are:

[0044] 1) Analyze the composition of the Bayer process red mud powder, and measure the content of Al2O3, iron oxide and silicon dioxide in the Bayer process red mud powder;

[0045] 2) Mix the Bayer process red mud powder with sodium carbonate, lime and carbon powder, place the mixed material in a ceramic crucible, and cover with a layer of 3-5mm thick reduced carbon powder (the main function is to isolate and prevent the reactant It will be oxidized again in contact with air), cover the lid and seal it tightly, and the mixing ratio of red mud powder, sodium carbonate, lime and reducing carbon powder should meet: the amount of sodium carbonate added (molar ratio) [Na 2 CO 3 ] / [Al 2 o 3 ]=1~1.1, the amount of lime added (molar ratio) [CaO] / [SiO 2 ] = 1.8 ~ 2, the amount of carbon powder added (mass rati...

Embodiment 3

[0051] This embodiment provides a process for recovering aluminum, iron and scandium from red mud powder by Bayer method, such as figure 1 As shown, the specific steps are:

[0052] 1) Analyze the composition of the Bayer process red mud powder, and measure the content of Al2O3, iron oxide and silicon dioxide in the Bayer process red mud powder;

[0053] 2) Mix the Bayer process red mud powder with sodium carbonate, lime and carbon powder, place the mixed material in a ceramic crucible, and cover with a layer of 3-5mm thick reduced carbon powder (the main function is to isolate and prevent the reactant It will be oxidized again in contact with air), cover the lid and seal it tightly, and the mixing ratio of red mud powder, sodium carbonate, lime and reducing carbon powder should meet: the amount of sodium carbonate added (molar ratio) [Na 2 CO 3 ] / [Al 2 o 3 ]=1~1.1, the amount of lime added (molar ratio) [CaO] / [SiO 2 ] = 1.8 ~ 2, the amount of carbon powder added (mass ra...

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Abstract

The invention provides a process for recovering aluminium, iron and scandium from Bayer-process red mud powder. The process comprises the following steps: mixing the Bayer-process red mud powder with sodium carbonate, lime and carbon powder, and then carrying out high-temperature roasting to obtain a roasted product A; placing the roasted product A in an alkaline liquid and dissolving out, separating to obtain a leaching liquid B and a leaching residue B, and using the leaching liquid B for recovering aluminium; screening out magnetic minerals and nonmagnetic minerals from the leaching residue B through magnetic separation, and using the magnetic minerals for recovering iron; drying the nonmagnetic minerals, and then adequately mixing and roasting the nonmagnetic minerals with chlorides to obtain a roasted product C; directly leaching the roasted product C with water, filtering and then obtaining a leaching liquid D, that is, scandium-containing solution, and a leaching residue D; and using the leaching liquid D for recovering scandium. The invention provides a method for recovering scandium from Bayer-process red mud, for recovering elements such as scandium and aluminium, thus resource recycling is realized.

Description

technical field [0001] The invention relates to a process for recovering aluminum, iron and scandium from red mud powder by Bayer process. Background technique [0002] Red mud is a waste of alumina production process. At present, the world produces about 100 million tons of red mud every year, and the annual output of red mud in my country is more than 50 million tons. According to different alumina production processes, red mud is divided into Bayer red mud, sintering red mud, and combined red mud. The composition of red mud is complex and alkaline, and it is easy to alkalize the land, pollute the soil, air and groundwater, seriously endanger the natural environment and affect people's health. At the same time, red mud generally contains valuable components such as rare metals, rare earth metals, aluminum, iron, etc. The scandium content in red mud in my country is generally 40-150g / t (according to scandium oxide), and the scandium content of some red mud has already Reac...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C22B59/00
CPCC22B7/00C22B21/00C22B59/00Y02P10/20
Inventor 任少峰刘金海张永康胡四春况顺达周丰何伟陈军刚陈述云熊明清
Owner ZUNYI ENERGY & MINERAL INVESTMENT CO LTD
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