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Method for baking clay ceramsite by using biological sludge of sewage treatment plant

A sewage treatment plant and biological sludge technology, which is applied in the field of using sewage treatment plant biological sludge to burn clay ceramsite, can solve the problems of occupying a large amount of land, incapable of resource utilization, and serious environmental pollution.

Inactive Publication Date: 2002-09-04
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

At present, many urban biological sludge is only used for landfill treatment, which not only occupies a large amount of land, but also cannot be used as a resource, and the degree of environmental pollution is becoming more and more serious. The development and utilization of biological sludge waste from sewage treatment plants has become an urgent need. research problem

Method used

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Embodiment Construction

[0029] Guangzhou Liede Sewage Treatment Plant is Example 1, Guangzhou Datansha Sewage Treatment Plant is Example 2 and Guangzhou Development Zone Sewage Treatment Plant is Example 3, and the biological sludge discharged from the three sewage treatment plants is part of the raw material. Using bituminous coal as fuel, the chemical composition (weight %) of the raw material and fuel is shown in Table 3, and the industrial analysis (weight %) and calorific value of the fuel are shown in Table 4.

[0030] Table 3 Raw material, fuel chemical composition (weight %)

[0031] Raw material Loss on ignition SiO 2 Al 2 o 3 Fe 2 o 3 CaO MgO K 2 O Na 2 OP 2 o 5 含水量实施例1 湿污泥 34.90 30.35 11.58 4.44 1.82 0.95 2.54 1.47 5.16 72.50实施例2 湿污泥 42.39 21.45 8.89 3.57 2.42 0.96 2.09 1.46 4.88 85.00实施例3 湿污泥 56.90 7.08 3.39 2.63 1.52 1.10 1.75 1.25 7.61 77.30

[0032] Wet Clay 10.00 59.89 17.43 8.62 2.21 1.6...

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Abstract

The present invention relates to a method for baking clay ceramsite by using biological sludge produced by sewage plant. Its raw material composition contains (wt%) clay 71-89%, dried biological sludge of sewage plant 6-21%, limestone 3-8% and iron powder 2-6%. This invention uses the biological sludge produced by sewage plant as useful resource to bake high-quality ceramsite instead of partial clay, and can save firing expansion agent and mineralizing agent so that it possesses the extensive application.

Description

technical field [0001] The invention relates to a firing technology of clay ceramsite, in particular to a method for firing clay ceramsite by utilizing biological sludge of a sewage treatment plant. Background technique [0002] Clay ceramsite refers to a kind of artificial inorganic light aggregate made by using clay as the main raw material, adding solid fuel (such as bituminous coal powder), mixing, forming into balls and sintering at high temperature. Because it has fine pores inside, it has the characteristics of light bulk density, high strength, small thermal conductivity, high refractoriness and good chemical stability, so it has better physical properties than natural aggregates, and can be used to prepare various high-strength and light-weight aggregates. Concrete and thermal insulation, sound absorption and sound insulation and other functional materials and products are widely used in construction, metallurgy, chemical industry, petroleum, agriculture and other d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/28C04B14/34C04B38/06
CPCC04B38/0665C04B14/28C04B14/34C04B2111/285
Inventor 吴清仁吴建青邢益和李丽桃郭晓时陈炜刘秋荣何琼宇
Owner SOUTH CHINA UNIV OF TECH
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