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Method for extracting high-purity aluminum oxide and silica gel from beauxite

A technology of bauxite and alumina, which is applied in the direction of silicon oxide, silicon dioxide, chemical instruments and methods, etc., can solve the problems of pollution, waste of resources and the environment, and achieve simplified process, reduced emissions, and less slag discharge Effect

Active Publication Date: 2010-07-07
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

In addition, the current alumina production technology will also discharge a huge amount of waste - red mud and abandoned low-grade bauxite, resulting in serious waste of resources and environmental pollution

Method used

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  • Method for extracting high-purity aluminum oxide and silica gel from beauxite
  • Method for extracting high-purity aluminum oxide and silica gel from beauxite
  • Method for extracting high-purity aluminum oxide and silica gel from beauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Take bauxite and Na 2 CO 3 Mix, pulverize and grind to 150 mesh according to the ratio of 1:1.2, and roast at a temperature of 700° C. for 20 minutes to obtain a roasted product. During calcination, the calcination equipment is connected to the gas output pipe and connected to the carbon separation tank, and the exhaust gas is directly used in the carbon separation process.

[0052] 2. Add water to the roasted product obtained in step 1, make the solid-to-liquid ratio of the roasted product and water 1:5, and leach for 30 minutes at a temperature of 80° C., then filter to obtain filtrate and filter residue.

[0053] 3. After concentrating the filtrate obtained in step 2 to 20% of the volume of the original solution, pass CO 2 Carry out carbonation. During the process of carbonization, keep the solution temperature at 60°C, filter the carbon after the pH value reaches 6, and the filter residue is H 2 SiO 3 and Al(OH) 3 mixture, the filtrate is Na 2 CO 3 soluti...

Embodiment 2

[0061] 1, step 2 gained filter residue and the Na of reclaiming among the embodiment 1 2 CO 3 Mix according to the ratio of 1:0.8, grind to 200 mesh, stir evenly, and roast at 800°C for 20 minutes to obtain a roasted product. When roasting, the calcination equipment is connected to the gas output pipe and connected to the carbon separation tank, which is directly used in the carbon separation process.

[0062] 2. The roasted product obtained in step 1 is added with a concentration of 5% sodium hydroxide solution (obtained by dissolving and diluting sodium hydroxide with distilled water obtained in step 4 of embodiment 1), and the solid-liquid ratio is 1: 10, and the temperature is 50°C Under the conditions, leaching for 90 minutes and then filtering to obtain the filtrate and filter residue.

[0063] 3. Concentrate the filtrate obtained in step 2 to 15% of the original volume, and feed CO into the concentrated filtrate 2 , after the pH value reaches 6, filter, and the filte...

Embodiment 3

[0071] 1, with the obtained filter residue of step 2 of bauxite, embodiment 2 and the Na reclaimed in embodiment 2 2 CO 3 , followed by mixing, pulverizing, and grinding to 200 meshes according to the ratio of 2:1:2, and roasting at a temperature of 800° C. for 40 minutes to obtain a roasted product. During calcination, the calcination equipment is connected to the gas output pipe and connected to the carbon separation tank, which is directly used in the carbon separation process.

[0072] 2. The roasted product obtained in step 1 is added with a concentration of 15% sodium hydroxide solution (obtained by dissolving and diluting sodium hydroxide with distilled water obtained in step 4 of embodiment 2), and the solid-liquid ratio is 1: 15, and the temperature is 60° C. conditions, leaching for 1 hour and then filtering to obtain the filtrate and filter residue.

[0073] 3. Concentrate the filtrate obtained in step 2 to 15% of the original volume, and feed CO into the concentr...

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Abstract

The invention discloses a method for extracting aluminum oxide and silica gel from beauxite (aluminum bauxite). In the method, steps such as cyclic activation, leaching, recovery of carbon, sodium carbonate and water, separation of silicon from aluminum, thermal decomposition and recovery of hydrochloric acid are employed to obtain high-purity aluminum oxide; in addition, CO2 produced in the whole technological process and alkaline, acid and water used in the process of extraction can all be recovered and recycled. The method of the invention features high extraction efficiency of aluminum oxide, simple technological process, high-purity obtained silica gel and major breakthroughs in solving the technical problem that a great deal of waste residue is produced in the process of traditionally extracting aluminum bauxite and deironing is costly.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgy and chemical production, in particular to a method for extracting alumina and silica gel from bauxite. Background technique [0002] In recent years, with the rapid development of my country's aluminum industry and the substantial increase in domestic alumina production, the demand for bauxite (also known as bauxite) has increased sharply. However, my country's current mineable and competitive reserves of bauxite are less than 200 million tons. According to the existing mining capacity, the static mining life of bauxite in my country is only about 15 years. [0003] More than 80% of domestic bauxite's A / S is 5-8 or even smaller middle and low-grade bauxite. Most of the existing alumina plants can only use bauxite with an aluminum-silicon ratio greater than 7 or above. In my country, the bauxite with an aluminum-silicon ratio greater than 7 only accounts for about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/20C01B33/12C01B7/03
Inventor 潘爱芳马润勇
Owner 北京蔚然欣科技有限公司
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