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Method for producing sulphoaluminate cement clinker by novel dry-process pre-decomposition kiln

A technology of dry precalcining kiln and sulphoaluminate cement, which is applied in the field of building material preparation, can solve the problems of high energy consumption and poor quality stability of products, and achieve the effects of reducing energy cost, reducing energy consumption, and expanding production capacity

Inactive Publication Date: 2020-10-30
YAOBAI SPECIAL CEMENT TECH R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of sulphoaluminate cement and clinker has been miniaturized, and the equipment used in production has not exceeded the cement clinker production line with a daily output of 1000t in view of the previous technical level, resulting in high energy consumption and poor quality stability.

Method used

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  • Method for producing sulphoaluminate cement clinker by novel dry-process pre-decomposition kiln
  • Method for producing sulphoaluminate cement clinker by novel dry-process pre-decomposition kiln

Examples

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Effect test

Embodiment 1

[0037] Mix 51% limestone, 12.6% gypsum, and 36.4% bauxite evenly and grind them into a fine powder with a fineness of 80 μm in a raw mill, with 10.5% remaining after sieving; then set up a calciner with a firing temperature of 1330°C to calcinate the fine powder 35mins, and then set the decomposition furnace outlet temperature to 800°C and rapidly cool to room temperature in a grate cooler at a cooling rate of 52°C / min to obtain the sulphoaluminate clinker prepared by the method of the present invention. After leaving the kiln, the initial setting time of clinker is 26mins, the final setting time is 35mins, the compressive strength of 1 day is 41.2MPa, and the compressive strength of 3 days is 56.1MPa.

Embodiment 2

[0039] Mix 49.5% limestone, 13.5% gypsum, and 37% bauxite evenly, and grind them into a fine powder with a fineness of 80 μm in a raw mill, with 11.2% remaining after sieving; then set the calciner for firing at 1340°C, and calcinate the fine powder 31mins, and then set the calciner outlet temperature to 815°C and rapidly cool to room temperature in a grate cooler at a cooling rate of 52°C / min to obtain the sulphoaluminate clinker prepared by the method of the present invention. After leaving the kiln, the initial setting time of clinker is 33mins, the final setting time is 49mins, the compressive strength of 1 day is 39.5MPa, and the compressive strength of 3 days is 54.7MPa.

Embodiment 3

[0041] Mix 48.2% limestone, 14.6% gypsum, and 37.2% bauxite evenly, and grind them into a fine powder with a fineness of 80 μm in a raw mill, with 9.5% remaining after sieving; then set up a calciner with a firing temperature of 1320°C to calcinate the fine powder 34mins, and then set the calciner outlet temperature to 830°C and rapidly cool to room temperature in a grate cooler at a cooling rate of 53°C / min to obtain the sulphoaluminate clinker prepared by the method of the present invention. After leaving the kiln, the initial setting time of clinker is 15mins, the final setting time is 23mins, the compressive strength of 1 day is 45.7MPa, and the compressive strength of 3 days is 62.4MPa.

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Abstract

The invention discloses a method for producing sulphoaluminate cement clinker by a novel dry kiln, and relates to the technical field of building material preparation, and the method comprises the following steps: S100, uniformly mixing raw materials limestone, gypsum and bauxite to obtain a mixed raw material; S200, grinding the mixed raw materials into fine powder; and S300, homogenizing the fine powder, calcining the homogenized fine powder in a pre-decomposition kiln outside the kiln, taking the calcined fine powder out of the kiln, and quenching to obtain the sulphoaluminate clinker. Compared with the prior art, the method has the advantages that the productivity can be effectively increased, and the daily yield of 2500t can be achieved; (2) the cement clinker produced by the method is more stable; and (3) the energy consumption of the produced cement clinker in unit time can be reduced, and the energy consumption cost of enterprises is reduced.

Description

technical field [0001] The invention relates to the technical field of building material preparation, in particular to a method for producing sulphoaluminate cement clinker by a novel dry method precalcining kiln. Background technique [0002] Sulphoaluminate cement is a special cement series successfully developed by the China Academy of Building Materials Science. It includes different cement varieties such as rapid hardening, self-stress, and low alkali. Good results have been achieved in construction projects and products such as stress cement pressure pipes and ordinary drainage pipes; a certain amount of applications have also been obtained in the preparation of special engineering materials such as waterproof materials, ready-mixed dry-mixed mortar and concrete expansion agents, and have been well received. It is welcomed by users; at the same time, it is also used in special projects such as anti-seepage plugging, rush repair and rush construction projects. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B7/36C04B7/44
CPCC04B7/323C04B7/36C04B7/44
Inventor 徐萍李县军张太权黄增党晓辉魏改玲欧阳啸普朝阳王荣伟
Owner YAOBAI SPECIAL CEMENT TECH R&D CO LTD