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Process for preparing porous light filtering material using coal gangue as raw material

A light-weight filter material and coal gangue technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve problems such as fragility, poor strength, and resistance to water erosion, and achieve high performance-price ratio and large specific surface area , the effect of hard appearance

Inactive Publication Date: 2006-01-25
NANJING UNIV +1
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Although the film hanging performance is good, its shape is uneven, its strength is poor, it is easily broken, its porosity is small, it is easy to block, and it is not resistant to water erosion. After a period of operation, the surface of the material is uneven, resulting in uneven water and air distribution. Low oxygen efficiency and reduced treatment effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Coal gangue, fly ash, steelmaking red mud, and charcoal powder are used as raw materials. The ratio is: coal gangue 65g, fly ash 25g, steelmaking red mud 5g, mica powder 5g. The production process is as follows:

[0016] ①Put 65g of coal gangue, 25g of fly ash, 5g of steelmaking red mud, and 5g of mica powder into the mixing kettle for 20 minutes, then add 28mL of water and 2mL of 0.2% polyacrylamide solution for mixing , artificial granulation.

[0017] ②Put the pellets into a sintering furnace with a temperature of 400°C, heat-preserve and dry for 60 minutes, then heat up and sinter to expand. When the temperature was raised to 1180°C, the temperature was kept for 8 minutes.

[0018] ③ After the sintered ceramsite is out of the furnace, it is naturally cooled to room temperature.

[0019] The difference between embodiment 2 and embodiment 1 is that the amount of fly ash is reduced, the amount of other raw materials is constant, and the operating conditions are con...

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Abstract

A process for preparing the light-weight spherical porous filtering material from coal gangue includes such steps as proportionally mixing coal gangue, powdered coal ash, red mud generated by smelting steel and puffing agent, stirring, adding water and shaping agent, granulating, drying, high-temp sintering and natural cooling. Its advantages are no pollution and high properties of product used for treating sewage.

Description

Technical field: [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a preparation method for producing a spherical porous light sewage treatment filter material through high-temperature sintering with coal gangue as the main raw material. Background technique: [0002] Coal gangue is the abandoned rock discharged during the coal mining process, and it is a large amount of industrial solid waste. The output of coal gangue in my country is about 15%-20% of the total output of raw coal, and the accumulation has reached 7 billion tons, and the annual discharge is still increasing at a rate of 150 million tons. However, the annual comprehensive utilization rate of coal gangue is still less than 20%, and the remaining coal gangue is mostly stacked naturally and loosely around the mine in a conical or valley dumping style, which not only occupies cultivated land, but also pollutes the environment. Comprehensive utilization of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/06
Inventor 张文艺翟建平李琴黎飞虎
Owner NANJING UNIV
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