Raw material preparation method for preparing high-whiteness and high-purity aluminum hydroxide by using solid waste

Pending Publication Date: 2021-11-23
内蒙古茂燊科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to utilize solid waste materials such as fly ash and coal gangue at home and abroad, many processes for extracting alumina from fly ash have been developed, mainly including pre-desilication method, mixed method and acid leaching method. Certain defects are manifested as high investment, high energy consumption, and high pollution. In addition, due to the fact that there are many sources of fly ash and coal gangue, different tastes, and large differences in physical properties, the use of these solid wastes is also faced with various raw mat

Method used

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  • Raw material preparation method for preparing high-whiteness and high-purity aluminum hydroxide by using solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] use as figure 1 A schematic flow chart of the raw meal preparation process for preparing high-white and high-purity aluminum hydroxide by using solid waste.

[0077] First, take fly ash, coal gangue, calcium carbide slag, coal powder, and soda ash, and carry out raw material pretreatment respectively, and use Raymond mill to grind the fineness to about 200 mesh to form pre-powder with the same material fineness. The mass percentages of fly ash, coal gangue, coal powder, calcium-containing solid waste and soda ash are: fly ash is 24%, coal gangue is 13%, calcium-containing solid waste is 42%, soda ash is 16%, coal The powder is 5%, and the raw meal is prepared. According to the 10-25% of the mass percentage of the dry homogenized raw meal, the water content is accurately measured and the batching is completed. In this embodiment, the pre-powder materials are sent to the intermediate silo of the raw materials respectively, and the batching is automated by the computer t...

Embodiment 2

[0084] The batching is carried out with reference to Example 1. The difference from Example 1 is that the fineness of the pre-powder is controlled at about 180 mesh.

[0085]First, take fly ash, coal gangue, coal powder, calcium carbide slag, and soda ash, and enter them into the Raymond mill for grinding to a fineness of about 180 mesh to form a pre-powder with the same material fineness, and then follow the measurement in Example 1 Batching Raw Meal Raw Meal Raw Meal Raw Meal Batching The water content is 10-25% of the mass percentage of the dry homogenized raw meal, accurately measured, and the raw meal batching is completed by microcomputer automatic batching.

[0086] First perform dry homogenization in a high-speed dry homogenizer, and then add 50°C water to carry out wet homogenization in a wet homogenizer. Homogenization time is 1-3 minutes, dry homogenization temperature is 50°C, wet homogenization control stirring speed is 200-500 rpm, wet homogenization temperature ...

Embodiment 3

[0089] The batching is carried out with reference to Example 1. The difference from Example 1 is that the fineness of the pre-powder is controlled at about 160 mesh.

[0090] First, take fly ash, coal gangue, coal powder, calcium carbide slag, and soda ash, and enter them into the Raymond mill for grinding to a fineness of about 160 mesh to form a pre-powder with the same material fineness, and then follow the measurement in Example 1 Batching Raw Meal Raw Meal Raw Meal Raw Meal Batching The water content is 10-25% of the mass percentage of the dry homogenized raw meal, accurately measured, and the raw meal batching is completed by microcomputer automatic batching.

[0091] First perform dry homogenization in a high-speed dry homogenizer, and then add 50°C water to carry out wet homogenization in a wet homogenizer. Homogenization time is 1-3 minutes, dry homogenization temperature is 50°C, wet homogenization control stirring speed is 200-500 rpm, wet homogenization temperature...

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Abstract

The invention relates to a raw material preparation method for preparing high-whiteness and high-purity aluminum hydroxide by using solid waste, which comprises the following steps: pretreating, proportioning and homogenizing raw materials to obtain a homogenized raw material, and the raw materials comprise fly ash, coal gangue, pulverized coal, calcium-containing solid waste and sodium carbonate; wherein the pretreatment comprises the following steps: crushing the raw materials, and controlling the crushing granularity of the process to be 120-220 meshes to form pre-powder; the batching comprising the steps of metering the pre-powder according to a process ratio, and batching to form a raw material; the homogenization comprising dry homogenization and wet homogenization, the raw material being firstly added into a dry homogenization machine to be subjected to dry homogenization, and then the raw material being subjected to wet homogenization to obtain a homogenized raw material. According to the method, the solid wastes such as the fly ash, the coal gangue and the carbide slag, the pulverized coal and the sodium carbonate are crushed to the same fineness, a fully and uniformly mixed homogenized raw material is obtained through microcomputer metering automatic batching accurate control, dry-process homogenization and wet-process homogenization treatment, high-whiteness and high-purity aluminum hydroxide can be obtained through alkaline sintering, and the recovery rate of aluminum in the fly ash resource solid wastes is 90% or above.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling, and in particular relates to a raw material preparation method for preparing high-white and high-purity aluminum hydroxide by using solid waste. Background technique [0002] The coal combustion process of power plants produces a large amount of fly ash. Except for a small part that is partially utilized as raw materials for cement and building materials, most of the fly ash is stored, which not only occupies a large amount of land resources, but also seriously pollutes the environment. The alumina content in fly ash is generally 17-35%, and the aluminum content in fly ash can be as high as 40-60% in some areas. It is a very important non-traditional alumina resource and has a high value for extracting aluminum. Coal gangue is solid waste formed during the coal mining process and coal washing process, and its main component is Al 2 o 3 , SiO 2 , Coal gangue is discarded, it takes...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/20
CPCC01F7/02C01F7/20
Inventor 曾峰李志伟
Owner 内蒙古茂燊科技有限公司
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