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Method for synthesizing tricalcium silicate single mineral from polyvinyl alcohol solution

A technology of polyvinyl alcohol solution and single mineral, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of uneven mixing of reactants, difficulty in ion diffusion, long time, etc., to prevent aggregation and crystallization behavior , High product purity, simple steps

Inactive Publication Date: 2013-01-23
TONGJI UNIV
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  • Abstract
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Problems solved by technology

Moreover, in the solid-phase method, since the raw materials are mixed in solid powder form, the reactants may be mixed unevenly, and ion diffusion is difficult during the calcination process. Therefore, the sintering temperature is high, the time is long, and the energy consumption is large, especially the final product The content of f-CaO in medium is still high, and contains C 2 S

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  • Method for synthesizing tricalcium silicate single mineral from polyvinyl alcohol solution

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Embodiment 1

[0029] Embodiment 1, a kind of synthetic tricalcium silicate (C 3 S) the method of single mineral, its raw material weight ratio is: Ca(NO 3 ) 2 4H 2 O 100, SiO 2 Sol 33.9, nitric acid solution 0.9, polyvinyl alcohol (polymerization degree 350) solution 47 and water 450. The following synthesis method was adopted: on a magnetic stirrer, heated at 60°C, Ca(NO 3 ) 2 4H 2 Add O into water, heat and stir for 20 minutes until completely dissolved; adjust the pH of the solution to 2.2 with nitric acid solution, add SiO 2 Heat and stir the sol for 20 minutes until it is completely dissolved; adjust the heating temperature of the magnetic stirrer to 90°C, add polyvinyl alcohol solution, heat and stir for 20 minutes until it is evenly mixed; the obtained uniformly mixed sol solution continues to stir and heat for 3 hours, and the water evaporates continuously to form a gel precursor body; put the gel precursor in an oven at 150°C, dry it for 24 hours, grind it and store it in a ...

Embodiment 2

[0030] Embodiment 2, a kind of synthetic tricalcium silicate (C 3 S) the method of single mineral, its raw material weight ratio is: Ca(NO 3 ) 2 4H 2O 100, SiO 2 Sol 33.9, nitric acid solution 1.0, polyvinyl alcohol (polymerization degree 500) solution 70 and water 480. The following synthesis method was adopted: on a magnetic stirrer, heated at 50°C, Ca(NO 3 ) 2 4H 2 Add O into water, heat and stir for 30 minutes until completely dissolved; adjust the pH value of the solution to 2.1 with nitric acid solution, add SiO 2 Heat and stir the sol for 30 minutes until it is completely dissolved; adjust the heating temperature of the magnetic stirrer to 80°C, add polyvinyl alcohol solution, heat and stir for 30 minutes until it is evenly mixed; the obtained uniformly mixed sol solution continues to stir and heat for 5 hours, and the water evaporates continuously to form a gel precursor body; put the gel precursor in an oven at 150°C, dry it for 24 hours, grind it and store it ...

Embodiment 3

[0031] Embodiment 3, a kind of synthesis tricalcium silicate (C 3 S) the method of single mineral, its raw material weight ratio is: Ca(NO 3 ) 2 4H 2 O 100, SiO 2 Sol 33.9, nitric acid solution 1.1, polyvinyl alcohol (polymerization degree 650) solution 100 and water 520. The following synthesis method was adopted: on a magnetic stirrer, heated at 53°C, Ca(NO 3 ) 2 4H 2 Add O into water, heat and stir for 28min until completely dissolved; adjust the pH value of the solution to 2.0 with nitric acid solution, add SiO 2 Heat and stir the sol for 28 minutes until completely dissolved; adjust the heating temperature of the magnetic stirrer to 83°C, add polyvinyl alcohol solution, heat and stir for 28 minutes until the mixture is uniform; the obtained uniformly mixed sol solution continues to stir and heat for 4.5 hours, and the water evaporates continuously to form a gel Precursor; put the gel precursor in an oven at 150°C, dry it for 24 hours, grind it and store it in a des...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a method for synthesizing tricalcium silicate (C3S) single mineral from polyvinyl alcohol solution. The raw materials used in the synthesis method include calcium nitrate, silica sol, nitric acid solution, polyvinyl alcohol solution and water. Compared with the traditional C3S synthetic method, the method using polyvinyl alcohol solution to synthesize C3S can obtain the C3S single mineral with high purity, large specific area and strong activity for one time under a low sintering temperature. The C3S obtained by the method has a low crystallizing temperature, can reduce energy consumption in the synthetic process and has a certain environmental effect. Compared with the traditional multiple sintering method, the method only needs one-time sintering, and reduces the sintering times and brings time efficiency; and meanwhile, the high specific surface area of the sintering product can also promote the growth of setting and hardening speed of C3S.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for synthesizing tricalcium silicate (C 3 S) Single mineral approach. Background technique [0002] With the rapid development of human architectural civilization, people put forward higher requirements for the durability of buildings, and the performance of cementitious materials has a decisive impact on the strength and durability of building components. [0003] Portland cement is the best and most widely used hydraulic cementitious material so far. The essence of its cementitious performance is the calcium silicate hydrate (C-S-H) gel formed by the hydration of cement clinker minerals to form a network structure. . In traditional Portland cement clinker C 3 S mineral is the main source of cement strength, and its content is generally 50%~60% (mass fraction), so C 3 The hydration, coagulation and hardening behavior of S, especially the difference in the...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 孙振平李奇俞洋
Owner TONGJI UNIV
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