Unlock instant, AI-driven research and patent intelligence for your innovation.

A preparation method of retarder for cement production

A technology of retarder and cement, applied in the field of retarder preparation, can solve the problems of great difficulty, difficult metering and transportation, etc., and achieve the effect of reducing resource exploitation and promoting large-scale and continuous use.

Inactive Publication Date: 2009-02-04
JIANGMEN ZHONGJIAN TECH DEV CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are technical difficulties in the use of powdered desulfurized gypsum in cement production. It is difficult to use desulfurized gypsum recycled by power plants with an attached water content of 16%. It is difficult to adapt to the process of cement dry powder grinding. Many factories have tried However, it is often discontinued due to difficulty in metering and delivery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method of retarder for cement production
  • A preparation method of retarder for cement production
  • A preparation method of retarder for cement production

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] A kind of retarder preparation method that is used for cement production, it comprises the following steps:

[0015] a: Prepare desulfurized gypsum with a water content of 13% to 19%, 65% to 98%, and 2% to 35% cement. As for the cement, it is best to use Portland cement with a label of 325 or more;

[0016] b: Put the prepared desulfurized gypsum and cement into the mixer and mix them evenly, add 4% to 8% of water, and then prepare them into granules. The granulation method is: granulation by granulator or granulation by mixer, of course for It is conducive to the uniform mixing of granulated materials, and the mixer and granulator can also be used in combination. When using it, it is best to control the granulated particle size between Φ3~Φ150mm;

[0017] c: The granular retarder obtained in step b is subjected to curing and drying treatment, and the water-cement ratio of the retarder is controlled at 16%-26%, and the attached moisture is 6%-10%. The curing and drying...

example 1

[0020] Formula: 88% desulfurized gypsum with a water content of 16%, and 12% ordinary Portland cement.

[0021] Put the prepared desulfurized gypsum and cement into the mixer and mix them evenly, add 5% water, and then prepare them into granules, and the granulation size is controlled at Φ5mm; after seven days of natural curing, the spheres will adhere to 8% water, The dry surface of the pellets can adapt to the cement production process, and the compressive strength of the pellets is 0.4Mpa.

[0022] When pellets are used as cement retarder and when natural dihydrate gypsum is used as retarder, the cement performance comparison: (both gypsum dosages are 4%)

[0023]

example 2

[0025] Formula: 98% desulfurized gypsum with a water content of 19%, and 2% ordinary Portland cement.

[0026] Put the prepared desulfurized gypsum and cement into the mixer and mix them evenly, add 4% water, and then prepare them into granules, and the granulation size is controlled at Φ100mm; after seven days of natural curing, the spheres will adhere to 8% water, The dry surface of the pellets can adapt to the cement production process, and the compressive strength of the pellets is 0.2Mpa.

[0027] Performance comparison table of cement prepared by using desulfurized gypsum and natural dihydrate gypsum as cement retarder: (both gypsum dosages are 4%)

[0028]

[0029] quantity

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

The cement retarder consists of desulfurized gypsum with 13-19% water content in 65-98 wt% and cement in 2-35 wt%. The present invention uses desulfurized gypsum as the waste from power plant as the main material for cement retarder. During cement hydration, desulfurized gypsum acts as the retarder, the cement hydrate in the desulfurized gypsum acts as the crystal seed to speed the hydration of cement and to raise the strength of cement, and cement absorbs partial of the water attached to the desulfurized gypsum to lower the water content in the desulfurized gypsum.

Description

technical field [0001] The invention relates to a method for preparing a retarder for cement production. Background technique [0002] At present, people on the market usually use natural gypsum as a retarder for cement production. According to the resource status of dihydrate gypsum in Guangdong, most of the natural gypsum in Guangdong is transported from Hunan and Hubei provinces. The resources are relatively scarce, and the quality is also low. It is not ideal. In addition, Guangdong's annual cement production is 70-80 million tons, and the amount of retarder is about 4%, and 2.8 million tons of natural gypsum will be used every year. Therefore, how to reduce the use of natural gypsum has already been put on the table. people's research agenda. [0003] my country is a country where coal is the main energy source. The air pollution caused by coal combustion is characterized by soot type, and the soot pollution is mainly SO 3 Gas desulfurization is an important means for...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14C04B103/22
Inventor 徐奇威
Owner JIANGMEN ZHONGJIAN TECH DEV CO LTD