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Method for preparing sintering-free cement by dry method and product thereof

A sintering-free, cement-free technology, applied in the field of traditional process technology innovation, can solve the problems of soil pollution, a large amount of waste liquid, high-strength dependence on physical and chemical properties, and limited promotion, and achieve excellent frost resistance and corrosion resistance, simple preparation process, A wide range of effects

Active Publication Date: 2020-09-11
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation of non-sintering cementitious materials tends to adopt the wet mixing process, and the research and development of non-sintering cementitious materials is limited by the inherent gelling activity and strength characteristics of raw materials
The wet process cannot improve the activity of raw materials like the high temperature kiln sintering process
The high dependence on the physical and chemical properties of raw materials limits the promotion of the current preparation processes of various sinter-free cementitious materials
At the same time, the current wet process will also produce a large amount of waste liquid, which will easily cause water and soil pollution around the production area

Method used

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  • Method for preparing sintering-free cement by dry method and product thereof
  • Method for preparing sintering-free cement by dry method and product thereof
  • Method for preparing sintering-free cement by dry method and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Effect of Mixed Raw Meal Components on the Properties of the Prepared Non-sintering Cement

[0023] Preparation of sinter-free cement material: Weigh steel slag, fly ash, quicklime, and phosphogypsum according to the mass parts in Table 1, mix and grind for 3 hours to obtain mixed raw meal. Specifically, 5 parts, 7 parts, 9 parts, 10 parts, 20 parts, 30 parts, 32 parts, 35 parts and 40 parts of steel slag were weighed respectively in the mixed raw meal, and 10 parts and 15 parts of fly ash were weighed respectively. 20 parts, 18 parts, 20 parts, 30 parts, 40 parts, 42 parts, 45 parts, 50 parts, quicklime were weighed 20 parts, 25 parts, 28 parts, 30 parts, 40 parts, 50 parts, 52 parts, 55 parts 60 parts, 2.5 parts, 3.5 parts, 4.5 parts, 5 parts, 7.5 parts, 10 parts, 10.5 parts, 11.5 parts, 12.5 parts of phosphogypsum were weighed respectively. Put the mixed raw meal into the reactor of the low-temperature plasma system, irradiate it with low-temperature plasm...

Embodiment 2

[0030] Example 2 Influence of low-temperature plasma action time on the performance of prepared non-sintering cement

[0031] Preparation of sinter-free cement material: Weigh 30 parts of steel slag, 40 parts of fly ash, 50 parts of quicklime, and 10 parts of phosphogypsum according to the parts by mass, mix and grind for 7.5 hours to obtain mixed raw meal. Put the mixed raw material into the reactor of the low-temperature plasma system, and irradiate the low-temperature plasma for 0.25 hours, 0.35 hours, 0.45 hours, 0.5 hours, 1 hour, 1.5 hours, 1.55 hours, 1.65 hours, and 1.75 hours, and take out the mixture , dried at 100°C and ground for 3 hours to avoid sintering cement materials, wherein during the low-temperature plasma irradiation process, the mixed gas of sulfur dioxide and oxygen is exposed to the reactor from the ground electrode (low-voltage electrode) end of the low-temperature plasma system , Expose water vapor from the high-voltage electrode end of the low-tempe...

Embodiment 3

[0036] Example 3 The influence of sulfur dioxide and oxygen volume ratio on the performance of prepared non-sintering cement

[0037] Preparation of non-sintering cement material: Weigh 30 parts of steel slag, 40 parts of fly ash, 50 parts of quicklime, and 10 parts of phosphogypsum according to the parts by mass, mix and grind for 12 hours to obtain mixed raw meal. Put the mixed raw material into the low-temperature plasma reactor, irradiate the low-temperature plasma for 1.5 hours, take out the mixed material, dry it at 150°C, and grind it for 4 hours to avoid sintering cement materials. The ground electrode (low-voltage electrode) end of the plasma system is exposed to sulfur dioxide and oxygen mixed gas into the reactor, and water vapor is exposed to the reactor from the high-voltage electrode end of the low-temperature plasma system. The volume ratio of sulfur dioxide and oxygen is 1: 100, 1.5: 100, 1.8: 100, 2: 100, 4: 100, 6: 100, 6.5: 100, 7: 100, 8: 100, the humidity ...

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Abstract

The invention discloses sintering-free cement. The sintering-free cement is prepared from the following components in parts by mass: 10-30 parts of steel slag, 20-40 parts of fly ash, 30-50 parts of quick lime and 5-10 parts of ardealite. The invention also discloses a method for preparing the sintering-free cement by a dry method. The preparation process is simple, and the required raw materialsare wide in source and easy to obtain. According to the invention, the dry preparation of the cement cementing material is realized under the sintering-free condition. The maximum uniaxial compressivestrength of a cement mortar solidified body prepared from the unfired cement material is 58.73 MPa. The uniaxial compressive strength of the cement mortar solidified body reaches the 52.5 grade of Portland cement. Compared with Portland cement, the cement material prepared by the invention has better frost resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the field of traditional technology innovation, in particular to a dry method for preparing non-sintering cement and its products. Background technique [0002] Cement production consumes a lot of energy. At present, high-temperature kiln sintering is still the most important process technology for converting raw cement to clinker in my country. However, with the continuous promotion of the current green low-carbon sustainable economic development model and the increasing demand for coping with global warming, the traditional high energy consumption, high carbon emission, and unsustainable cement sintering production process has gradually become out of step with the development of the times. The technological innovation of cement production process and the transformation of cement industry are imminent. [0003] In recent years, with the continuous development of green building materials, more and more social forces have begun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00
CPCC04B12/005
Inventor 黄涛宋东平谢建超杜晶藏颖邓锦涛
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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