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Dicalcium silicate-calcium sulphosilicate-sulphoaluminate cement and one-step firing method thereof

A technology of sulfoaluminate cement and calcium sulfosilicate, which is applied in cement production and other fields

Inactive Publication Date: 2020-10-20
江苏建鸿环保材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, people have researched and developed a variety of cementitious materials, such as alkali-activated cementitious materials, geopolymers, sulphoaluminate cement, etc., but there is no cementitious material that is mature enough to replace ordinary concrete in large quantities. Portland cement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Mix 71 parts by mass of limestone, 26.5 parts by mass of silicon dioxide, 33 parts by mass of alumina, and 13.2 parts by mass of gypsum dihydrate, and mix the prepared raw meal in a mixer for 6 hours to obtain cement raw meal; The obtained raw material is calcined in a high-temperature furnace, and the high-temperature furnace is raised from room temperature to 1150°C, and kept at 1150°C for 30 minutes, and then the clinker is taken out of the high-temperature furnace and quenched in the air to obtain dicalcium silicate-sulfur silicon Calcium-sulfoaluminate cement clinker. According to the quantitative analysis of Rietveld full spectrum fitting, the mineral composition of cement clinker is: calcium sulfoaluminate: 25.36%, calcium sulfosilicate: 30.24%, tricalcium aluminate: 6.38%, gypsum: 7.53%, disilicic acid Calcium: 30.49%.

Embodiment 2

[0026] Example 2: 65 parts by mass of limestone, 25.3 parts by mass of silica, 31.5 parts by mass of alumina, and 11.8 parts by mass of dihydrate gypsum were mixed, and then the prepared raw meal was mixed in a mixer for 6 hours to obtain cement raw meal. Put the obtained raw material into a high-temperature furnace for calcination, and the high-temperature furnace is raised from room temperature to 1200°C, and kept at 1200°C for 30 minutes, then the clinker is taken out of the high-temperature furnace and quenched in the air to obtain dicalcium silicate-sulfur Calcium silicate-sulfoaluminate cement clinker. According to the quantitative analysis of Rietveld full spectrum fitting, the mineral composition of cement clinker is: calcium sulfoaluminate: 28.63%, calcium sulfosilicate: 33.51%, tricalcium aluminate: 5.6%, gypsum: 6.27%, disilicic acid Calcium: 26.53%.

Embodiment 3

[0027] Example 3: Mix 68 parts by mass of limestone, 27.1 parts by mass of silica, 29.8 parts by mass of alumina, and 12.5 parts by mass of dihydrate gypsum, and then mix the prepared raw meal in a mixer for 6 hours to obtain cement raw meal; The obtained raw material is calcined in a high-temperature furnace, and the high-temperature furnace is raised from room temperature to 1200°C, and kept at 1200°C for 1 hour, and then the clinker is taken out of the high-temperature furnace and quenched in the air to obtain dicalcium silicate-sulfur Calcium silicate-sulfoaluminate cement clinker. According to the quantitative analysis of Rietveld full spectrum fitting, the mineral composition of cement clinker is: calcium sulfoaluminate: 30.72%, calcium sulfosilicate: 27.48%, tricalcium aluminate: 5.22%, gypsum: 4.33%, disilicic acid Calcium: 32.25%.

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Abstract

The invention discloses a dicalcium silicate-calcium sulphosilicate-sulphoaluminate cement and a one-step firing method thereof. The cement is prepared from, by mass, 1 part of limestone, 0.15 to 0.4part of silicon dioxide, 0.2 to 0.5 part of aluminum oxide and 0.15 to 0.2 part of dihydrate gypsum. The method for firing the cement clinker product comprises the following steps: 1) mixing the limestone, silicon dioxide, aluminum oxide and dihydrate gypsum according to a required ratio, putting the mixture into a stirrer, and stirring for 6 hours for full mixing; 2) tabletting the raw material mixture under 4.5 MPa, drying, putting into a high-temperature furnace, gradually heating to 1150-1200 DEG C, keeping the temperature for 0.5-1 hour, quickly taking out, and cooling; and 3) crushing cooled clinker pieces in a vibration mill to obtain the cement clinker. The temperature required by the cement firing method is low, the energy consumption is low, and the clinker conversion rate in thefinished product can reach 90%.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to dicalcium silicate-calcium sulfosilicate-sulfoaluminate cement, a primary firing method and its application. Background technique [0002] Cement is an important raw material for national infrastructure construction and has made important contributions to national economic and social development, especially in the process of urbanization and modernization. Portland cement has always occupied an absolute dominant position (over 95%) in various cements due to its advantages such as easy availability of raw materials, mature production technology, and stable performance. However, the consumption of resources, energy and carbon emissions in the manufacturing process of Portland cement are very large, resulting in a huge environmental load on the cement industry. Exploring a new low-emission and low-energy clinker system, and developing a new low-emission and low-energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/345C04B7/36C04B7/44
CPCC04B7/345C04B7/36C04B7/44Y02P40/10
Inventor 陈建军陈建春张文生许家昊叶家元王宏霞任雪红
Owner 江苏建鸿环保材料科技有限公司
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