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Method for preparing geopolymer materials from red mud and coal ash

A technology of geopolymer and fly ash, applied in cement production and other directions, can solve the problem that there are not many technologies put into practice, and achieve the effect of simple preparation method

Active Publication Date: 2016-05-25
HEBEI CONSTR & INVESTIGATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After retrieving relevant literature, a lot of experimental research work has been done on the utilization of red mud and fly ash in various industries at home and abroad, and good application prospects have been obtained. However, due to technical and economic reasons, the implementation of not much technology

Method used

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  • Method for preparing geopolymer materials from red mud and coal ash
  • Method for preparing geopolymer materials from red mud and coal ash
  • Method for preparing geopolymer materials from red mud and coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The ratio of raw materials is shown in Table 1:

[0019] Table 1

[0020]

[0021] Naturally air-dry the required raw materials red mud and fly ash in a ventilated and dry place until the moisture content is not more than 35%, pass through a 0.3mm-0.6mm round-hole sieve after air-drying, bag them separately, and keep them moisture-proof for later use; the concentration of the prepared mass percentage is 10% % sodium hydroxide solution for later use.

[0022] Weigh the red mud and F-class fly ash according to the ratio of 1:1, respectively weigh the red mud and fly ash, and weigh the sodium hydroxide at a liquid-solid ratio, that is, the ratio of the alkali solution to the red mud and fly ash mixture is 0.6 Solution, first mix the red mud and fly ash evenly, then pour into the sodium hydroxide solution and stir for 5-10 minutes, mix evenly in the mortar mixer, pour the evenly stirred red mud and fly ash into the mold release coating In the cement mortar anti-compres...

Embodiment 2

[0024] Raw material ratio scheme is shown in Table 2:

[0025] Table 2

[0026]

[0027] The required raw materials red mud and fly ash are naturally air-dried in a ventilated and dry place until the moisture content is not more than 35%. Prepare a sodium hydroxide solution with a mass percentage concentration of 3.5% for subsequent use. Weigh the red mud and Class C fly ash respectively according to the mass ratio of 1:1, and weigh the sodium hydroxide solution according to the liquid-solid ratio of 0.5.

[0028] First mix red mud and fly ash evenly, then pour into sodium hydroxide solution and stir for 5 to 10 minutes, and mix evenly in a mortar mixer. Pour the uniformly mixed red mud and fly ash into the cement mortar compression test mold coated with a release agent, pound it evenly with a steel tamping rod, place it on a vibrating table to vibrate until the mortar surface comes out, and scrape flat. Place the test mold flat for 24 hours to demould, and place it in ...

Embodiment 3

[0030] Raw material ratio scheme is shown in Table 3

[0031] table 3

[0032]

[0033] The required raw materials red mud and fly ash are naturally air-dried in a ventilated and dry place until the water content is not more than 35%. After air-drying, pass through a 0.3mm-0.6mm round-hole sieve, and bag them separately to prevent moisture for later use. Weigh the red mud and F-class fly ash according to the mass ratio of 2:8, and weigh the clear water with a liquid-solid ratio of 0.25.

[0034] First, mix the red mud and fly ash evenly for 5-10 minutes, and mix them evenly in a mortar mixer. Pour the uniformly mixed red mud and fly ash into the cement mortar anti-compression test mold coated with a release agent, pound it evenly with a steel tamping rod, place it on a vibrating table and vibrate until the surface of the mortar comes out, and Scrape. Place the trial mold flat for 24 hours to demould, and place it in a curing room (65°C, 100% humidity) for curing. Accord...

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Abstract

The invention discloses a method for preparing geopolymer materials from red mud and coal ash. The red mud and the coal ash are used as main base raw materials, and sodium hydroxide solution is used as an alkali-activator, so that the red mud and coal ash geopolymer gel materials can be prepared. The method includes mixing the red mud and the coal ash with each other according to different mass percentages to obtain geopolymers; respectively adding the NaOH solution with different concentrations into the geopolymers; oxidizing the geopolymer and the NaOH solution under different curing conditions of curing rooms and laboratories to obtain the geopolymer materials with different strength grades. The method has the advantages that the method is simple, the geopolymer materials prepared by the aid of the method can be widely applied to numerous fields of manufacture of building materials, roadbed fillers, pile materials and the like, the problem of environmental pollution due to existing red mud can be solved, waste can be turned into wealth, and positive promoting effects for comprehensively utilizing the red mud and the coal ash can be realized.

Description

technical field [0001] The invention relates to a method for preparing inorganic non-metallic polymer materials, in particular to a method for preparing geopolymer materials by using red mud and fly ash, and belongs to the technical fields of waste comprehensive utilization and building material preparation. Background technique [0002] Red mud is the waste residue discharged when the aluminum industry extracts alumina. It is a strong alkaline substance that pollutes the environment, and it is easy to form a large amount of dust and smog during storage, causing pollution to the environment. According to estimates, the world produces about 70 million tons of red mud every year, and our country produces more than 30 million tons of red mud every year. A large amount of red mud is stored in large-scale storage yards, which takes up a lot of land and causes serious pollution to the environment. The production of red mud has affected human production and life in many ways. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCC04B7/243C04B12/005Y02P40/10
Inventor 聂庆科王英辉李华伟贾向新梁书奇秦禄盛于俊超
Owner HEBEI CONSTR & INVESTIGATION RES INST
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