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Method for preparing pure beta-C2S with high activity

A high-activity, high-purity technology, applied in the direction of alkaline earth metal silicates, silicates, etc., can solve the problems of insignificant hydration and low activity

Inactive Publication Date: 2019-08-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At low temperature, C 2 S has two crystal forms: β-C 2 S and γ-C 2 S, γ-C 2 The S structure is very stable, the hydration effect is not obvious, and the activity is very low; β-C 2 S is a metastable state, β-C 2 S and γ-C 2 The transition between S is unidirectional, that is, only by β-C 2 S becomes γ-C 2 S , but not by γ-C 2 S transforms into β-C 2 S, which makes β-C 2 S is particularly rare

Method used

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  • Method for preparing pure beta-C2S with high activity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) According to the amount of raw material, take CaCO 3 :SiO2 2 :CaSO 4 =1:1:0.002, mixed in a 60r / min mixer for 240min;

[0018] (2) Under the condition of 20MPa, press about 30g of mixed raw materials into a cake with a tablet press, especially, the thickness of the cake is 4mm;

[0019] (3) Put the pressed cake in a platinum crucible, and then put the platinum crucible with mixed raw materials in a SG-XL1700 box furnace, especially, 0-800°C, the heating rate is 5°C / min, 800°C -1200°C, the heating rate is 4°C / min, hold at 1200°C for 160min;

[0020] (4) Take out the platinum crucible at about 1200°C before the program of the box furnace is completed, put it in a well-ventilated and low-temperature idle environment and use a blower to cool it. After cooling, use CA-5 free calcium oxide The analyzer measures the content of f-CaO.

Embodiment 2

[0022] (1) According to the amount of raw material, take CaCO 3 :SiO2 2 :CaSO 4 =1:1:0.003, mixed in a 60r / min mixer for 240min;

[0023] (2) Under the condition of 20MPa, press about 40g of mixed raw materials into a cake with a tablet press, especially, the thickness of the cake is 6mm;

[0024] (3) Put the pressed cake in a platinum crucible, and then put the platinum crucible with mixed raw materials in a SG-XL1700 box furnace, especially, 0-800°C, the heating rate is 5°C / min, 800°C -1200°C, the heating rate is 4°C / min, hold at 1200°C for 160min;

[0025] (4) Take out the platinum crucible at about 1200°C before the program of the box furnace is completed, put it in a well-ventilated and low-temperature idle environment and use a blower to cool it. After cooling, use CA-5 free calcium oxide The analyzer measures the content of f-CaO.

Embodiment 3

[0027] (1) According to the amount of raw material, take CaCO 3 :SiO2 2 :CaSO 4 =1:1:0.004, mixed in a 60r / min mixer for 240min;

[0028] (2) Under the condition of 20MPa, press about 50g of mixed raw materials into a cake with a tablet press, especially, the thickness of the cake is 7mm;

[0029] (3) Put the pressed cake in a platinum crucible, and then put the platinum crucible with mixed raw materials in a SG-XL1700 box furnace, especially, 0-800°C, the heating rate is 5°C / min, 800°C -1200°C, the heating rate is 4°C / min, hold at 1200°C for 160min;

[0030] (4) Take out the platinum crucible at about 1200°C before the program of the box furnace is completed, put it in a well-ventilated and low-temperature idle environment and use a blower to cool it. After cooling, use CA-5 free calcium oxide The analyzer measures the content of f-CaO.

[0031] The free calcium oxide content of above-mentioned three embodiments and " GB / T21372-2008 Portland cement clinker " standard req...

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Abstract

The invention discloses a method for preparing a pure beta-C2S with the high activity. The method comprises the following steps: firstly weighing raw materials according to the molar ratio of CaCO3:SiO2:CaSO4.2H2O = 1:1:(0.002-0.004) and performing mixing, then performing pressing into a cake by a tablet press, performing heat preservation for 240 min at 1200 DEG C in a box furnace, performing taking out, and performing cooling by a blower in an idle environment with good ventilation and a relatively low temperature. The beta-C2S is prepared by the method, the preparation temperature is low, the electrical energy consumption is low, the synthesis process is simplified, the calcination number is greatly reduced, the calcination product activity is high, the purity is high, and thus the beta-C2S is beneficial for the scientific research of silicate clinker minerals and single mineral hydration.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing highly active pure C 2 S method. Background technique [0002] C 2 S (dicalcium silicate) is a kind of Portland cement clinker, the chemical formula is (2CaO·SiO 2 ), usually contains a small amount of other elements in cement, such as Al, Fe and other solid solutions, and C 3 Compared with S (tricalcium silicate), dicalcium silicate minerals have unique characteristics in terms of composition, formation and performance, especially in solving resource and energy problems, reducing emissions and improving performance. [0003] The high-quality limestone with a CaO content of 52%-56% widely used in cement production 20 years ago is now rare in cement production. It is replaced by low-grade limestone with a CaO content of 42%-50%. Some enterprises even Wastes such as calcium carbide slag are used as calcium raw materials; on the other hand, rising energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24
CPCC01B33/24C01P2006/80
Inventor 周宗辉任尊超袁连旺
Owner UNIV OF JINAN