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A method of burning cement by using lime drying sludge

A technology for drying sludge and lime, used in building materials and cement fields, can solve problems such as raw material consumption, achieve good solidification, alleviate serious consumption and save land resources.

Active Publication Date: 2016-06-15
北京方兴科创环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a method of burning cement using lime-dried sludge, aiming at alleviating the serious consumption of raw materials in the cement industry, and at the same time safely disposing of lime-dried sludge in cement kilns, thereby saving a large amount of land resources

Method used

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  • A method of burning cement by using lime drying sludge
  • A method of burning cement by using lime drying sludge
  • A method of burning cement by using lime drying sludge

Examples

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Effect test

Embodiment 1

[0020] In this example, lime-dried sludge was obtained from a sewage treatment plant in Beijing, and other cement raw materials including limestone, sandstone, and fly ash were obtained from a cement factory in Beijing, and the test site was a cement factory in Beijing.

[0021] 1) Carry out full chemical analysis of lime drying sludge and other cement raw materials including limestone, sandstone, fly ash, etc. Table 1 shows the chemical composition of each component of the raw meal.

[0022] Table 1 Full chemical analysis of raw materials (mass fraction / %)

[0023]

[0024] 2) Raw ingredients. The rate values ​​used in this embodiment are KH=0.91±0.01, SM=2.6±0.1, IM=1.5±0.1. First determine the amount of sludge added, and then determine the ratio of other raw materials according to the requirements of the rate value. In this embodiment, the amount of lime-dried sludge added is 0%, 5.0%, 10.0%, 15.0%, 20.0%, respectively. 25.0%, and 30.0%, according to the dosage from l...

Embodiment 2

[0041] Sludge after lime drying treatment of a sewage treatment plant in Beijing is used to burn cement. Take 10kg of lime-dried sludge that has been dried to a moisture content of less than 3%, and the rate values ​​are KH=0.94, SM=2.37, and IM=1.30. After the lime dried sludge is blended into the raw meal at a dosage of 15%, the cement clinker is fired at 1400 ° C, and gypsum is added to grind it together to make cement. In the end, all the chemical and physical indexes of the obtained cement meet the ex-factory standards stipulated in GB175-2007.

Embodiment 3

[0043] Sludge after lime drying treatment of a sewage treatment plant in Beijing is used to burn cement. Take 100kg of lime-dried sludge that has been dried to a moisture content of less than 3%, and the rate values ​​are KH=0.88, SM=2.40, and IM=1.40. After the lime dried sludge is blended into the raw meal at a dosage of 20%, the cement clinker is fired at 1400 ° C, and gypsum is added to grind it together to make cement. In the end, all the chemical and physical indexes of the obtained cement meet the ex-factory standards stipulated in GB175-2007.

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Abstract

The invention provides a method of firing to produce cement by utilization of lime dried sludge, and belongs to the field of building materials. The method includes dewatering the lime dried sludge until the water content is lower than 3%, mixing the dewatered lime dried sludge in a weight percent of 10-30%with other cement raw materials to perform raw material burdening, firing at 1400 DEG C to obtain a cement clinker, adding the cement clinker into gypsum, and grinding together to obtain the cement. The cement produced by the method has good performances and completely meets related national standards. Heavy metals in the lime dried sludge are cured in the cement well, so that no secondary pollution occurs. On the one hand, the method effectively overcomes a problem of severe raw material consumption in the cement industry, and on the other hand, the lime dried sludge is safely processed in a cement kiln, thus saving a large amount of the land resource.

Description

technical field [0001] The invention belongs to the field of construction, and relates to a construction material, which is cement obtained by firing lime-dried sludge. technical background [0002] In recent years, with the continuous improvement of my country's urbanization level and the enhancement of people's awareness of environmental protection, great progress has been made in the construction of urban drainage and sewage treatment infrastructure. The construction and operation of sewage treatment plants will inevitably produce a large amount of excess sludge. Excess sludge not only contains a large amount of microorganisms, organic matter and rich nitrogen, phosphorus, potassium and other nutrients, but also contains heavy metals, pathogenic microorganisms, etc. If it is not handled properly, it will cause serious secondary pollution. At the same time, the investment and operating costs of sludge treatment are huge, accounting for 25%-65% of the investment and operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/24C04B7/36
CPCY02P40/10Y02P40/121
Inventor 邢奕洪晨张坤宋存义汪莉姜长禄王志强
Owner 北京方兴科创环境科技有限公司