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Method for extracting high purity alumina and silica gel from coal gangue

A coal gangue and alumina technology, applied in the direction of silica, silica, alumina/aluminum hydroxide, etc., can solve the problems of destroying the natural landscape of mining areas and occupying land resources, so as to reduce production costs, simplify production processes, The effect of high extraction rate

Active Publication Date: 2010-06-30
潘爱芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The massive accumulation of coal gangue not only takes up a lot of land resources, but also destroys the natural landscape of the mining area.

Method used

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  • Method for extracting high purity alumina and silica gel from coal gangue
  • Method for extracting high purity alumina and silica gel from coal gangue
  • Method for extracting high purity alumina and silica gel from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Take coal gangue and Na 2 CO 3 Mix according to the mass ratio of 1:1.2, pulverize and grind to 150 meshes, and roast at a temperature of 700°C for 60 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, so that the solid-to-liquid ratio of the roasted product and water is 1:5, leach for 30 minutes at a temperature of 80° C., and 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 ...

Embodiment 2

[0061] 1, with the obtained filter residue of step 3 in embodiment 1 and the Na that reclaims 2 CO 3 Mix according to the ratio of 1:0.8, grind to 200 mesh, stir evenly, and roast at 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.

[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 Example 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 8, filter, and ...

Embodiment 3

[0071] 1, with coal gangue, step 2 gained filter residue in embodiment 2 and the Na reclaimed in embodiment 2 2 CO 3 , followed by mixing, pulverizing, and grinding to 200 mesh in the ratio of 2:1:2, and roasting at a temperature of 600° C. for 70 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.

[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-to-liquid ratio is 1: 15, and the temperature is 60° C. Under the condition of leaching for 1 hour and then filtering, the filtrate and filter residue were obtained.

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

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Abstract

The invention discloses a method for extracting high purity alumina and silica gel from a coal gangue, which adopts the following steps: roasting for activation, leaching and filtrating for separation, carbon separating, sodium carbonate and water recovering, silicon-aluminum separating, thermal decomposing, hydrochloric acid recovering and the like, so as obtain the high purity alumina and the silica gel. The CO2 generated in the whole process as well as alkali, acid and water used in the extraction process can be recovered, so as to realize the cyclic utilization. The method has the characteristics of high extraction ratios of the alumina and the silica gel and small quantity of discharged slag. The deironing link in the process for extracting the alumina and the silica gel from the coal gangue, thereby not only simplifying the process procedure and greatly lowering the cost.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste discharged in the comprehensive production process of energy, power generation, metallurgy and chemical industry, and in particular relates to a method for extracting alumina and silica gel from coal gangue. Background technique [0002] Coal gangue is solid waste generated during coal mining and washing. my country is a large coal-producing country. Coal gangue accounts for 15% to 20% of the total raw coal output, and the utilization rate is less than 15%. Therefore, coal gangue has become the industrial solid waste with the largest cumulative stockpile and the largest area in my country. According to statistics, the accumulated stockpile of coal gangue in my country has reached more than 7 billion tons, covering an area of ​​about 70 km 2 , and an annual increase of 150 million tons (covering an area of ​​6.7km 2 ). [0003] The massive accumulation of coal ga...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/14
Inventor 潘爱芳马润勇
Owner 潘爱芳
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