Method for producing aluminum oxide by sintering calcium carbide mud, fly ash and coal gangue

A technology of coal gangue and calcium carbide mud, applied in the field of alumina preparation, can solve problems such as strict equipment requirements, high sintering temperature, pollution, etc., and achieve the effects of avoiding high temperature and high pressure desiliconization, shortening extraction time, and reducing production costs

Active Publication Date: 2019-03-26
内蒙古绿盎循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid method is divided into sulfuric acid leaching method, hydrochloric acid leaching method, fluorine ammonium solubilization method, some common problems of the acid method, the separation process of aluminum and iron in the pretreatment stage is complicated, the acid slag and acid gas are not easy to handle, and the requirements for equipment are relatively strict, which is not conducive to carrying out large-scale industrial production
Alkali method is divided i

Method used

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  • Method for producing aluminum oxide by sintering calcium carbide mud, fly ash and coal gangue
  • Method for producing aluminum oxide by sintering calcium carbide mud, fly ash and coal gangue
  • Method for producing aluminum oxide by sintering calcium carbide mud, fly ash and coal gangue

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[0037] Example 1

[0038] A method for producing alumina with calcium carbide mud fly ash and coal gangue sintering method, comprising the following steps in sequence:

[0039] The chemical composition of raw material 1 fly ash is as follows:

[0040]

[0041] The chemical composition of raw material 1 coal gangue is as follows:

[0042]

[0043]Raw meal configuration: Weigh 100 parts of fly ash, 30 parts of coal gangue, 100 parts of calcium carbide mud, and 100 parts of soda ash, pulverize to 160 mesh, and carry out ingredients according to the solid-liquid ratio of 5:1, stir evenly, and obtain raw meal;

[0044] The raw meal was calcined at 850°C for 1 hour, cooled to room temperature, crushed and ground to 80 mesh to obtain clinker;

[0045] The prepared clinker was dissolved in water, stirred and dissolved at 85°C for 30 minutes, and the dissolution rate of alumina was calculated to be 90%;

[0046] The filtered red mud is washed, filtered again, and the filtered ...

Example Embodiment

[0050] Example 2

[0051] The chemical composition of raw material 2 fly ash is as follows:

[0052]

[0053] The chemical composition of raw material 2 coal gangue is as follows:

[0054]

[0055] A method for producing alumina with calcium carbide mud fly ash and coal gangue sintering method, comprising the following steps in sequence:

[0056] Raw meal configuration: Weigh 110 parts of fly ash, 35 parts of coal gangue, 105 parts of calcium carbide mud, and 105 parts of soda ash, pulverize to 160 mesh, and make ingredients according to the solid-liquid ratio of 5:1, stir evenly, and prepare raw meal;

[0057] The raw meal was calcined at 880°C for 1 hour, cooled to room temperature, and crushed and ground to 80 mesh to obtain clinker;

[0058] The prepared clinker was dissolved in water, stirred and dissolved at 85°C for 30 minutes, and the dissolution rate of alumina was calculated to be 92%;

[0059] The filtered red mud is washed, filtered again, and the filtered...

Example Embodiment

[0063] Example 3

[0064] The chemical composition of raw material 3 fly ash is as follows:

[0065]

[0066] The chemical composition of raw material 2 coal gangue is as follows:

[0067]

[0068] A method for producing alumina by sintering calcium carbide mud fly ash and coal gangue, comprising the following steps in sequence:

[0069] For raw meal configuration, weigh 108 parts of fly ash, 33 parts of coal gangue, 110 parts of calcium carbide mud, and 106 parts of soda ash, pulverize to 160 mesh, carry out ingredients according to the solid-liquid ratio of 5:1, stir evenly, and prepare raw meal;

[0070] The raw meal was calcined at 950°C for 1 hour, cooled to room temperature, and crushed and ground to 80 mesh to obtain clinker;

[0071] The prepared clinker was dissolved in water, stirred and dissolved at 85°C for 30 minutes, and the dissolution rate of alumina was calculated to be 89%;

[0072] The filtered red mud is washed, filtered again, and the filtered lot...

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Abstract

The invention discloses a method for producing aluminum oxide by sintering a calcium carbide mud, fly ash and coal gangue. The method sequentially comprises the following steps of preparing of raw materials, sintering of clinker, dissolving-out of the clinker, separating and washing of red mud, dealkalizing of the red mud, desilicication of crude liquid, preparation of crystal seeds, carbonation decomposing of concentrated liquid, separating and washing of aluminum hydroxide, roasting of aluminum hydroxide, and evaporation of mother liquid. The method is characterized in that by using the carbon as the main material and using the crystal seeds as the auxiliary material, the particle size of aluminum hydroxide is controlled by adjusting the temperature and rotation speed; in the preparationprocess of the raw materials, the coal gangue is used for providing an aluminum source, and the internal combustion temperature is provided; the calcium carbide mud is used as a calcium source; in the processes of dealkalizing of the red mud and desilicication of the crude liquid, the calcium carbide mud is used for replacing lime emulsion as the calcium source; the washing liquid of the red mud,the washing liquid of the dealkalized red mud, and the washing liquid of the aluminum hydroxide are respectively used for adjusting the causticity ratio of a reaction system when the clinker is dissolved out next time. The method has the advantages that the utilization rate of the existing resources is effectively increased, and the production cost is reduced.

Description

technical field [0001] The invention discloses a method for producing alumina by sintering calcium carbide mud fly ash and coal gangue, belonging to the field of alumina preparation. Background technique [0002] Alumina is a high-hardness compound with a melting point of 2054°C and a boiling point of 2980°C. It is an ionic crystal that can be ionized at high temperatures and is often used in the manufacture of refractory materials. Alumina is an extremely tight industrial product in my country. The growth of China's alumina production is far from meeting the growth of my country's market demand. At present, the distribution of bauxite, the raw material for alumina production, is very unbalanced, and 98% of the mineral deposits are diaspore. , the impurity content is high, the ore is difficult to dissolve, the production is difficult and the cost is high. At present, regardless of the acid leaching method or the sintering method, Al is extracted from fly ash. 2 o 3 There a...

Claims

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Application Information

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IPC IPC(8): C01F7/44C01F7/14C01F7/08
CPCC01F7/085C01F7/142C01F7/441
Inventor 王博
Owner 内蒙古绿盎循环科技有限公司
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