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Method for improving alumina silica ratio of low-grade bauxite

A low-grade bauxite, aluminum-silicon ratio technology, applied in the field of improving the low-grade bauxite aluminum-silicon ratio, low-grade bauxite purification, can solve the problems of high cost, long process, poor dissolution performance, etc., to reduce Taste requirements, effect of reducing emissions

Active Publication Date: 2012-04-25
北京蔚然欣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, low-grade bauxite, especially diaspore-type ore, can only be produced by sintering and hybrid methods due to its low aluminum-silicon ratio (about 4-6) and poor dissolution performance. Aluminum oxide
The sintering method and the hybrid method not only have a long process, high energy consumption and high cost, but also have a series of shortcomings such as large output of red mud and serious pollution.

Method used

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  • Method for improving alumina silica ratio of low-grade bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) After crushing the low-grade bauxite, mix it with solid sodium carbonate at a ratio of 1:1.2 and grind it into a 100-mesh mixed material.

[0042](2), the mixed material obtained in step (1) was roasted for 50 minutes at a temperature of 150°C to obtain roasted clinker; during roasting, the calcining equipment was connected to the gas output pipe and connected to the carbon separation tank.

[0043] (3) Add an appropriate amount of water to the roasted clinker obtained in step (2), and make the solid-to-liquid mass ratio 1:5, and leaching for 40 minutes at a temperature of 50°C. After leaching, filter to obtain filtrate and filter residue respectively. It has been determined that the aluminum-silicon ratio (A / S) in the filter residue is 11, which satisfies the aluminum-silicon ratio condition of the material required for the subsequent Bayer process to produce alumina.

[0044] (4), after the filtrate obtained in step (3) is concentrated to 30% of the original solu...

Embodiment 2

[0047] (1) After the low-grade bauxite is crushed, it is mixed with solid sodium carbonate at a ratio of 1:1 and ground into a 200-mesh mixed material

[0048] (2), the mixed material obtained in step (1) was roasted for 40 minutes at a temperature of 350° C. to obtain roasted clinker; during roasting, the calcining equipment was connected to the gas output pipe and connected to the carbon separation tank.

[0049] (3) Add an appropriate amount of water to the roasted clinker obtained in step (2), and make the solid-liquid mass ratio 1:7, and leaching for 50 minutes under the temperature condition of 40°C. After leaching, filter to obtain filtrate and filter residue respectively.

[0050] (4), after the filtrate obtained in step (3) is concentrated to 20% of the original solution, the CO output from step (2) is fed under normal pressure. 2 Carry out carbonation. The carbon content temperature is 50°C, and the carbon content is stopped when the pH value of the filtrate reache...

Embodiment 3

[0054] (1) After the bauxite tailings are crushed, they are mixed with solid sodium carbonate at a ratio of 1:2 and ground into a 200-mesh mixed material.

[0055] (2), the mixed material obtained in step (1) was roasted for 40 minutes under the temperature condition of 300° C. to obtain roasted clinker; during roasting, the calcining equipment was connected to the gas output pipe and connected to the carbon separation tank.

[0056] (3) Add an appropriate amount of water to the calcined clinker obtained in step (2), and make the solid-liquid mass ratio 1:6, and leaching for 20 minutes at a temperature of 50°C. After leaching, filter to obtain filtrate and filter residue respectively. It has been determined that the aluminum-silicon ratio (A / S) in the filter residue is 10, which satisfies the aluminum-silicon ratio condition of the material required for the subsequent Bayer process to produce alumina.

[0057] (4), after the filtrate obtained in step (3) is concentrated to 30...

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Abstract

The invention discloses a method for improving the alumina silica ratio of low-grade bauxite. The method comprises the steps of crushing, grinding, roasting, activating, leaching desilicification, carbonization, recovery of auxiliary agents and water and the like, so that high-quality materials which can meet the requirement of high alumina silica ratio required for producing alumina by a Bayer process can be obtained, and a certain amount of high-purity silica gel can be obtained. The method fulfils the aim of utilizing the low-grade bauxite (including bauxite tailings) and develops a new way for the development and utilization of the low-grade bauxite. During the entire process, the produced CO2 and the used auxiliary agents and water can be recovered and recycled. Compared with other chemical mineral processing methods, the method has the characteristics of high desiliconization rate, low alumina loss rate, low energy consumption, low cost and simple process; and the removed silicon is directly produced in the form of high-purity silica gel with high added value and can also be effectively utilized.

Description

Technical field: [0001] The invention belongs to the field of chemical industry and relates to a method for purifying low-grade bauxite, in particular to a method for increasing the aluminum-silicon ratio of low-grade bauxite. Background technique: [0002] The types of bauxite ore are different, not only the alumina production technology used is different, but also the production cost is also very different. Diaspore bauxite has the characteristics of high alumina, low silicon, high iron, and easy dissolution. Therefore, the cost of producing alumina by Bayer process technology for this type of ore is relatively low. However, low-grade bauxite, especially diaspore-type ore, can only be produced by sintering and hybrid methods due to its low aluminum-silicon ratio (about 4-6) and poor dissolution performance. alumina. The sintering method and the hybrid method not only have a long process, high energy consumption and high cost, but also have a series of disadvantages such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/26C01B33/14C01F7/02
Inventor 潘爱芳
Owner 北京蔚然欣科技有限公司
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