Method for producing alumina through mineral containing aluminum

A technology for alumina and minerals, which is applied in the preparation of alkali metal aluminate/alumina/hydroxide, alumina/hydroxide, chemical industry, etc., and can solve the problem of difficult economic utilization and low-quality aluminum-containing mineral resources Major problems, to achieve the effect of energy saving in the production process

Inactive Publication Date: 2012-10-10
GUIZHOU BRANCH CHINA ALUMINUM IND
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the effective mine range A / S>2.6, 1

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use aluminum-containing ore with A / S of 2.0, prepare raw meal according to the formula of alkali ratio 0.2 and calcium ratio 1.2, and sinter at 1330°C to obtain clinker. The clinker is dissolved in two stages with a solution of 220g / l sodium carbonate concentration. The alumina concentration of the dissolved slurry is 110g / l, the industrial dissolution rate of alumina is 90%, the industrial dissolution rate of sodium oxide is 92%, and the solid content of the red mud of the dissolved slurry is about 180g / l. The rubber belt filter is used for rapid separation and washing. The red mud has a water content of 30% in the last washing and goes directly to cement production. The separated crude liquid of the sintering method is desiliconized and decomposed to obtain an aluminum hydroxide product, and the alumina product is obtained after roasting, and the decomposed mother liquor is evaporated and returned to the clinker dissolution process.

Embodiment 2

[0023] Use aluminum-containing ore with A / S of 1.8, prepare raw meal according to the formula of alkali ratio of 0.15 and calcium ratio of 1.25, sinter at 1340°C to obtain clinker, and perform two-stage dissolution of clinker with a solution of 200g / l sodium carbonate concentration. The alumina concentration of the dissolved slurry is 100g / l, the industrial dissolution rate of alumina is 88%, the industrial dissolution rate of sodium oxide is 91%, and the solid content of the red mud of the dissolved slurry is about 175g / l. The rubber belt filter is used for rapid separation and washing. After the last washing, the red mud has a moisture content of 31% and it is directly used to produce cement. The separated crude liquid of the sintering method is desiliconized and decomposed to obtain an aluminum hydroxide product, and the alumina product is obtained after roasting, and the decomposed mother liquor is evaporated and returned to the clinker dissolution process.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for producing alumina through mineral containing aluminum, and relates to a method for economically and effectively recycling alumina from low-quality mineral resources containing aluminum. The method is characterized in that the production process comprises the following steps: (1), the mineral containing the aluminum are mixed with lime and sodium carbonate, and the mixture is processed into chamotte through dry-method sintering; (2), after being pulverized, the sintered chamotte is dissolved out, and the dissolved-out slurry is separated and cleansed to obtain the sodium aluminate solution and red mud slag; (3), aluminium hydroxide is decomposed and separated out after the silicon of the sodium aluminate solution is removed, the mother liquid after the decomposition returns to the dissolve-out work procedure, and the aluminum hydroxide is roasted to obtain the alumina product; (4), and the red mud slag is directly used for cement production. The method can be used for processing the low-quality mineral resources containing the aluminum, which is not in the concept scope of bauxite. The production technical flow is energy-saving and environmental-friendly, and all heat resources used in the production process are the residual heat of clinker kilns, lime kilns and calcinators. In the production flow, the red mud is used as the raw material for producing cement, no red mud slag is piled, and clean production is realized.

Description

Technical field [0001] A method for producing alumina from aluminum-containing minerals relates to a method for economically and efficiently recovering alumina from low-quality aluminum-containing mineral resources. Background technique [0002] Alumina production usually uses bauxite as a raw material. With the continuous decline in the grade of bauxite ore, alumina production resources are in short supply and even face the danger of exhaustion. How to economically and efficiently produce alumina from low-quality aluminum-containing mineral resources within the scope of non-bauxite has become a major technical problem restricting the development of alumina production. [0003] At present, the effective ore range stipulated by the state of bauxite resources A / S> 2.6, 1 <A / S The amount of low-quality aluminum-containing mineral resources that are not within the scope of the concept of bauxite is large, and it is currently difficult to economically utilize them. Summary of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/08C01F7/30
CPCY02P20/10
Inventor 邹若飞张占明赵培生郭晋梅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap