Method for synthesizing tobermorite whiskers with fly ash as raw material

A technology of tobermullite and fly ash, which is applied in the field of synthesizing tobermullite whiskers, can solve the problems of harsh raw materials and reaction conditions, unsatisfactory structure and morphology of whisker products, etc., and achieve relief The effects of environmental pressure, crystallinity and crystallization rate increase, and complete crystallization plane

Active Publication Date: 2016-07-20
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

The above research has carried out a useful exploration on the method or process of synthesizing tobermolite whiskers from fly ash raw materials, but it has strict requirements on raw materials and reaction conditions, and the structure and morphology of the obtained whisker products are not very ideal. For the production of some low-end products

Method used

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  • Method for synthesizing tobermorite whiskers with fly ash as raw material
  • Method for synthesizing tobermorite whiskers with fly ash as raw material
  • Method for synthesizing tobermorite whiskers with fly ash as raw material

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: After the quicklime is digested, according to the Ca / N molecular ratio, it is 1000 to add the surfactant dodecylamine, and then it is 30ml / g and the calcium-silicon molar ratio with the fly ash to prepare the suspension slurry according to the liquid-solid ratio of 1.2. Adjust the pH value to 13 with caustic alkali, put it into the reaction kettle after stirring and mixing, and react at a constant temperature of 250 rpm at 240° C. and 3.2 MPa pressure for 3 hours. After the reaction, cool down to room temperature naturally, then filter and wash the reacted slurry, dry the filter cake at a temperature of 75°C and perform XRD analysis. The results show that calcium silicate hydrate gel (CSH) in the product decreased, while the generation of tobermolite increased.

Embodiment 2

[0039] Embodiment 2: After the quicklime is digested, according to the Ca / N molecular ratio, it is 100 to add the surfactant dodecylamine, and then it is 20ml / g and the calcium-silicon molar ratio with the fly ash to prepare the suspension slurry according to the liquid-solid ratio of 0.8. Adjust the pH value to 13 with caustic alkali, put it into the reaction kettle after stirring and mixing, and react at a constant temperature of 200 rpm at 220° C. and 2.5 MPa pressure for 6 hours. After the reaction was completed, it was rapidly cooled to room temperature, and then the reacted slurry was filtered and washed, and the filter cake was dried at a temperature of 75°C for XRD analysis. The main phase of the product was tobermullite.

Embodiment 3

[0040] Example 3: after the quicklime is digested, the surfactant organic amine dodecylamine is added according to the Ca / N molecular ratio of 10, and the suspension slurry is prepared with fly ash according to the liquid-solid ratio of 15ml / g and the calcium-silicon molar ratio of 1.0 , use caustic soda to adjust the pH value to 14, stir and mix evenly, put it into a reaction kettle, and react at a constant temperature of 100 rpm at 180° C. and 1.8 MPa pressure for 8 hours. After the reaction, quickly cool to room temperature, then filter and wash the reacted slurry, dry the filter cake at a temperature of 75°C and perform XRD analysis. The product is mainly 1.1nm tobermullite, which is found by SEM detection Its morphology is obviously needle-shaped, and the crystal plane is relatively complete. The average length of tobermullite whiskers is about 100 μm, and the diameter is about 0.1 μm. Among the obtained products, the aspect ratio of a single whisker can reach up to 3000....

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Abstract

The invention relates to a method for synthesizing tobermorite whiskers with fly ash as a raw material and belongs to the technical field of nanometer whisker products. According to the method, an addition agent and a calcium resource are mixed uniformly according to the Ca / N molar ratio of (1-1000): 1 to obtain mixed slurry, after the pH value of the mixed slurry is adjusted to be 11-14, the fly ash is added, and in a high-pressure closed container, the mixture reacts at the temperature ranging from 150 DEG C to 260 DEG C, so that the tobermorite whiskers are obtained; the addition agent is a surfactant; the surfactant is an amino compound or a derivative of the amino compound. According to the method, the industrial solid waste fly ash is used as the raw material, the synthesized tobermorite whiskers can serve as a high-quality silicate heat-preserving and fireproofing material, and after being separated and purified, the tobermorite whiskers can also serve as an inorganic addition agent of a function composite material. The method is simple, feasible and beneficial for promoting high value-added utilization of the fly ash resource, and the product can be applied to the fields of building materials, metallurgy materials, chemical engineering materials and the like.

Description

technical field [0001] The invention relates to a method for synthesizing tobermullite whiskers by using fly ash as a raw material, and belongs to the technical field of nano whisker material products. Background technique [0002] Fly ash is the ash that remains after coal combustion and is an artificial volcanic material. The appearance of fly ash is like cement, and there are mainly three types of solid substances: drift ash (fine ash floating from the chimney), fly ash (fine ash accumulated in the flue gas), and bottom ash (from the bottom slag). discharged fine ash). At present, about 70% of the total domestic fly ash comes from coal-fired power plants, and other sources mainly include heating boilers, cement factories, ceramic factories and other enterprises. In 2013, the amount of fly ash produced in my country was about 580 million tons, and the comprehensive utilization was 400 million tons, with a comprehensive utilization rate of 69%. Among them, 176 million ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/34C30B29/62C30B7/10
CPCC30B7/10C30B29/34C30B29/62
Inventor 李光辉姜涛彭志伟张元波曹鹏旭罗骏范晓慧李骞张鑫杨凌志徐斌陈许玲郭宇峰杨永斌甘敏孙虎邓博纳
Owner CENT SOUTH UNIV
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