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A method of calcification-carbonization processing of low-grade aluminum-containing raw materials and aluminum circulation

A low-grade, carbonization technology, applied in the field of comprehensive utilization of resources, can solve the problems of increasing production process costs, adverse effects, and high energy consumption, and achieve the effects of improving environmental protection standards, low production energy consumption, and reducing the amount of CO2 gas

Active Publication Date: 2015-11-04
DONGDA NONFERROUS SOLID WASTE TECH RES INST LIAOLING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can effectively utilize non-traditional aluminum resources such as fly ash, nepheline, and low- and medium-grade bauxite, their production process mostly includes sintering or flotation, and sintering is used to extract non-traditional aluminum resources. Most of the alumina has the problems of high energy consumption and high cost, and the method of flotation not only increases the cost of the production process, but also introduces organic matter into the Bayer process, which will adversely affect the subsequent links

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  • A method of calcification-carbonization processing of low-grade aluminum-containing raw materials and aluminum circulation

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Experimental program
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Effect test

Embodiment 1

[0041] Crush the bauxite to -250μm, mix the calcium aluminate and bauxite at a mass ratio of 1.2:1, and react with calcification transformation in the 1# dissolution solution for 90 minutes at a temperature of 280°C, and the sodium oxide in the 1# dissolution solution The concentration is 280g / L, the molar ratio of sodium oxide to alumina is 3.5:1, and the pulp produced during the calcification transformation dissolution process is diluted and solid-liquid separated to obtain calcified slag with hydrated garnet as the main phase and 1# dissolution mother liquor, 1 #The molar ratio of sodium oxide to aluminum oxide in the dissolution mother liquor is reduced to 1.6:1. After the 1# dissolution mother liquor is refined with lime milk and added with aluminum hydroxide seed crystals to decompose and precipitate aluminum hydroxide, the molar ratio of sodium oxide to alumina is 3.5: The 1# decomposed mother liquor of 1, the 1# decomposed mother liquor is evaporated and the concentrati...

Embodiment 2

[0047] Crush the bauxite to -250μm, mix the calcium aluminate and bauxite at a mass ratio of 0.5:1, and perform the calcification transformation dissolution reaction in the 1# dissolution solution at a temperature of 130°C for 15 minutes, and oxidize in the 1# dissolution solution The sodium concentration is 100g / L, and the molar ratio of sodium oxide to alumina is 2.5:1. The pulp produced during the calcification transformation dissolution process is diluted and solid-liquid separated to obtain calcified slag with hydrated garnet as the main phase and 1# dissolution mother liquor. 1# dissolves Na in the mother liquor 2 The molar ratio of O and alumina is reduced to 1.7:1, and the 1# dissolution mother liquor is refined by lime milk and decomposed by adding aluminum hydroxide seed crystals, and after aluminum hydroxide is precipitated, 1# decomposition with a molar ratio of sodium oxide to alumina of 2.5:1 is obtained. Mother liquor, the 1# decomposed mother liquor is evaporat...

Embodiment 3

[0053] Crush the bauxite to -250μm, mix calcium aluminate and bauxite at a mass ratio of 0.7:1, and calcify in 1# dissolution mother liquor at a temperature of 240°C for 60min. The concentration of sodium oxide in 1# dissolution mother liquor is 100g / L, the molar ratio of sodium oxide to alumina is 2.5:1, the pulp produced in the dissolution process of calcification transformation is diluted and separated from solid and liquid to obtain calcified slag with hydrated garnet as the main phase and 1# dissolution mother liquor, which is transformed through calcification After 1# dissolves Na in the mother liquor 2 The molar ratio of O and alumina is reduced to 1.55:1, and the 1# dissolution mother liquor is refined by lime milk and decomposed by adding aluminum hydroxide seed crystals, and aluminum hydroxide is precipitated to obtain 1# decomposition with a molar ratio of sodium oxide to alumina of 2.5:1. Mother liquor, the 1# decomposed mother liquor is evaporated and the concentr...

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Abstract

The invention relates to the field of aluminiferous raw material utilization, in particular to a calcification-carbonization method for treating a low-middle grade aluminiferous raw material and aluminum cycle. The calcification-carbonization method comprises the following steps: carrying out calcification transformation dissolving reaction of low-middle grade bauxite or other aluminiferous materials in a dissolving liquid of 100g / L to 280g / L to obtain calcification residues; carrying out carbonization reaction on the calcification residues to obtain carbonization residues; dissolving out the aluminiferous phase of the calcification transformation residues by adopting a sodium hydroxide solution of 40g / L to 120g / L; adding calcic materials into the dissolved liquid obtained in the dissolving process of the phase to obtain a calcium aluminate precipitate; in addition, alkali liquor is returned to the dissolving process and can be recycled after filtration, and the calcium aluminate precipitate is returned to the calcification transformation dissolving process as an ingredient of calcium source or replaces lime in a production process adopting Bayer process. According to the invention, obtained tailings can be used in the cement industry, so that the recycling efficiency of alumina in the aluminiferous raw material is improved, the harmless utilization of the tailings is realized and a large quantity of CO2 can be absorbed during the production process at the same time. Therefore, the calcification-carbonization method is an environment-friendly method for alumina production.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of resources, and in particular relates to a method for processing medium and low-grade aluminum-containing raw materials and recycling aluminum based on a calcification-carbonization method. technical background [0002] Most of the bauxite resources in my country are diaspore bauxite, and most of them are low-grade aluminum resources with high aluminum and high silicon. With the continuous improvement of the production capacity of my country's alumina industry and the increasingly tense reserves of bauxite resources, my country's current research and development technologies for producing alumina from non-traditional aluminum resources such as low-grade bauxite, nepheline and fly ash are relatively low. Among them, "a method for extracting alumina from fly ash, application number: 201010300143" invented by Zhang Kaiyuan of Beijing Century Dihe Technology Co., Ltd. is realized through the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 张廷安吕国志张子木刘燕豆志河赵秋月
Owner DONGDA NONFERROUS SOLID WASTE TECH RES INST LIAOLING CO LTD
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