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Method for preparing sulphoaluminate cement by using fluorine-containing sludge

A technology for sulfoaluminate cement and sludge is applied in the field of environmental engineering, which can solve the problems of waste of resources and occupation of landfill resources, and achieve the effect of saving energy and protecting the environment.

Inactive Publication Date: 2012-12-05
苏州伟宇天诚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no comprehensive utilization method for fluorine-containing sludge. After preliminary drying to reduce the moisture content to 60%, it is sent to a hazardous waste landfill for landfill treatment, which not only occupies landfill resources, but also causes waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: (1) solidification and drying of fluorine-containing sludge, the sludge with higher fluorine content obtained in the sewage plant, adding curing agent and stabilizer to the sludge, and then by mechanical stirring, the sludge and The curing stabilizer is mixed well. A solidified fluorine-containing sludge is obtained. (2) Production of sulphoaluminate cement; 1) Preparation of raw meal. The raw materials used in sulphoaluminate cement are limestone, bauxite and gypsum. The specific ratio is: limestone 45%, Al2O3 25%, SiO2 15%, gypsum 12%, fluorine-containing sludge 3%; 2) Clinker firing, raw meal is generally calcined in a rotary kiln at a temperature of 1300-1400°C The clinker formation process is as follows: at 950°C, C4A3S and C2AS begin to form; at 1100°C, C2S appears; at 1200°C, C2AS disappears, and 2C2S·CaSO appears 4 ; At 1250°C, C2S increases; at 1300-1400°C, 2C2S·CaSO 4 Disappeared, the clinker burned. 3) Cement preparation, sulphoaluminate cem...

Embodiment 2

[0013] Example 2: (1) solidification and drying of fluorine-containing sludge, the sludge with a larger fluorine content obtained in a sewage plant is added to the sludge with a solidifying agent and a stabilizer, and then by mechanical stirring, the sludge and The curing stabilizer is mixed well. Obtain solidified sludge. (2) Production of sulphoaluminate cement, 1) Preparation of raw meal. The raw materials used in sulphoaluminate cement are limestone, bauxite and gypsum. The specific ratio is: limestone 50%, Al2O3 25%, SiO2 10%, gypsum 14%, fluorine-containing sludge 1%; 2) Clinker firing, raw meal is generally calcined in a rotary kiln at a temperature of 1300-1400 °C After calcination, the clinker formation process is: at 950°C, C4A3S and C2AS begin to form; at 1100°C, C2S appears; at 1200°C, C2AS disappears, and 2C2S·CaSO appears 4 ; At 1250°C, C2S increases; at 1300-1400°C, 2C2S·CaSO 4 Disappears, and the clinker burns. 3) Cement preparation, sulphoaluminate cement,...

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PUM

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Abstract

The invention provides a method for preparing sulphoaluminate cement by using fluorine-containing sludge, and belongs to the technical field of environmental engineering. The method comprises the following steps that 1, solidifying and desiccating fluorine-containing sludge; and 2, producing sulphoaluminate cement, wherein (1) preparation of raw materials: preparing the sulphoaluminate cement by using the following raw materials in percentage by weight: over 45 percent of CaO, 25 to 35 percent of Al2O3, less than 15 percent of SiO2, over 10 percent of gypsum and 1 to 3 percent of fluorine-containing sludge; (2) burning of chamotte: calcining the raw materials in a rotary kiln at the temperature of between 1,300 and 1,400 DEG C; and (3) preparation of cement: mixing 75 to 80 percent of the chamotte and 20 to 25 percent of the fluorine-containing sludge and grinding the chamotte and the fluorine-containing sludge until a specified specific surface area is reached. According to the method, the aims of innocent, stabilized and recycling use of sludge are achieved by adding the fluorine-containing sludge into the sulphoaluminate cement and burning the mixture of fluorine-containing sludge and the sulphoaluminate cement, so not only energy is saved, but also environment is protected and mankind is benefited.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for mixing fluorine-containing sludge into fired sulphoaluminate cement. Background technique [0002] In the field of sewage treatment, the treatment and disposal of sludge, as well as the reduction and recycling of sludge are one of the important issues of environmental protection. Sludge is a by-product of sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, microbial cells, inorganic particles, colloids, etc. Dry sludge usually accounts for 0.3% to 0.5% of the sewage volume or 1% to 2% of the mass. Due to the different sources of sewage, the sludge produced after treatment has different characteristics. It is a special solid waste. Sludge has always been a problem that plagues the normal operation of sewage plants in sewage treatment projects. How to properly treat and dispose of sludge to achieve...

Claims

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Application Information

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IPC IPC(8): C04B7/36C04B7/32C04B7/24
CPCY02P40/10
Inventor 黄靖宇
Owner 苏州伟宇天诚环保科技有限公司
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