Novel technique for extracting aluminum oxide from coal gangue

A technology of coal gangue and new process is applied in the field of comprehensive utilization of coal gangue, which can solve the problems of complex process, no chemical reactivity and high energy consumption, and achieve the effects of saving aluminum ore resources, reducing environmental pollution and ecological destruction of vegetation.

Inactive Publication Date: 2008-07-02
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Naturally occurring coal gangue without spontaneous combustion has almost no chemical reactivity, and it is difficult to directly extract and utilize it
In the past, people used coal gangue to dissolve → AlCl 3 Hydrolysis→alkali dissolution to remove iron→carbonization to precipitate Al(OH) 3 →washing→drying→roasting process to extract Al 2 o 3 , but this method is complicated in process and high in energy consumption, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: First, coal gangue is processed according to the following procedure: 50 g of coal gangue is crushed and ground to a particle size of less than 0.074 μm, and roasted at 660° C. for 0.5 hour. At 98°C, take hydrochloric acid with a concentration of 15% and add a certain amount of coal gangue to prepare a solid-liquid ratio of 1:4 (ratio of the mass of coal gangue to the mass of hydrochloric acid) (g / g), and the speed of the electric mixer is 340r / min, react for 80 minutes, cool to room temperature, and then use a centrifuge to separate the solid from the liquid, put the separated solid in an oven, heat it to 95°C, and dry it for 4 hours. After drying, pure Al can be obtained 2 o 3 .

Embodiment 2

[0007] Example 2: Firstly, coal gangue is processed according to the following procedure: 50 g of coal gangue is crushed and ground to a particle size of less than 0.074 μm, and roasted at 680° C. for 45 minutes. At 98°C, take hydrochloric acid with a concentration of 20% and add a certain amount of coal gangue to prepare a solid-liquid ratio of 1:5 (ratio of the mass of coal gangue to the mass of hydrochloric acid) (g / g), and the speed of the electric mixer is 360r / min, react for 90 minutes, cool to room temperature, and then use a centrifuge to separate the solid from the liquid, put the separated solid in an oven, heat it to 100°C, and dry it for 5 hours. After drying, pure Al can be obtained 2 o 3 .

Embodiment 3

[0008] Example 3: Firstly, coal gangue is processed according to the following procedure: 50 g of coal gangue is crushed and ground until the particle size is less than 0.074 μm, and roasted at 750° C. for 55 minutes. At 98°C, take hydrochloric acid with a concentration of 30% and add a certain amount of coal gangue to prepare a solid-liquid ratio of 1:6 (ratio of the mass of coal gangue to the mass of hydrochloric acid) (g / g), and the speed of the electric mixer is 370r / min, react for 100 minutes, cool to room temperature, and then use a centrifuge to separate the solid from the liquid, put the separated solid in an oven, heat it to 100°C, and dry it for 6 hours. After drying, pure Al can be obtained 2 o 3 .

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Abstract

The invention relates to the comprehensive utilization of gangue, in particular to a new technique using the gangue for extracting alumina. The purpose of the invention is to provide a new technique using the gangue for extracting Al2O3 and enhancing the extraction rate of Al2O3. Raw gangue is smashed and milled to certain granularity and then sintered for certain time at high temperature. At certain temperature, hydrochloric acid with certain concentration is added into the gangue to prepare a mixture with certain ratio of solid to liquid (the mass ratio between the gangue and the hydrochloric acid) (g/g), then the mixture is stirred by an electric mixer for reacting for a period of time; after cooled to certain temperature, the mixture is treated with solid and liquid separation by using a centrifuge; the separated solid is heated and dried in an oven, and pure Al2O3 is obtained after being dried. The experiment indicates that the alumina can be extracted from the gangue through the activation processing of the gangue by using hydrochloric acid in the condition of high temperature sintering, and the extraction rate can reach 83.1 percent, thereby a plurality of aluminum mine resource can be saved and environment pollution and destruction to vegetation and ecology caused by mining can be reduced.

Description

1. Technical field [0001] The invention relates to comprehensive utilization of coal gangue, and relates to a new process for extracting alumina from coal gangue. 2. Background technology [0002] Coal gangue is the solid waste with the largest discharge and stacking volume in my country at present. The total stacking volume of coal gangue in the country is about 4.5 billion tons, causing great environmental pollution and waste of resources. Rational use of coal gangue can not only recover useful minerals, produce building materials and some common chemical products, but also extract Al 2 o 3 , SiO 2 and other high value-added products. The mineral composition of coal gangue is mainly kaolinite, in which Al 2 o 3 The content can reach 20% to 30%, which is a potential aluminum resource. Naturally occurring coal gangue without spontaneous combustion has almost no chemical reactivity, and it is difficult to extract and utilize it directly. In the past, people used coal g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/20
Inventor 冯有利于立竟
Owner HENAN POLYTECHNIC UNIV
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