Method for preparing light porous ceramsite from municipal sewage sludge

A technology for urban sewage and porous ceramics, which is applied in the field of building materials to achieve the effects of simple system, saving energy consumption for sintering, and good social and economic benefits

Inactive Publication Date: 2017-09-22
新岛世纪(北京)新型材料技术有限公司 +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a method of utilizing urban sewage sludge to prepare lightweight porous ceramsite for the above-mentioned existing urban sludge development status, which solves the problem of using high-volume urban sewage sludge and a large number of poor-quality coal seams. Tailings coal gangue, a method for preparing lightweight porous ceramsite with excellent performance by using certain chemical additives and using a simple molding, drying and sintering method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The invention provides a method for preparing lightweight porous ceramsite by using urban sewage sludge. First, the raw materials are weighed according to weight percentage: 70% of urban dewatered sludge, 20% of coal gangue powder, 3% of silicon carbide, and 7% of calcium phosphate. Among them, the particle size of coal gangue powder is 500 mesh; the particle size of silicon carbide powder is 500 mesh, and the purity is 96%; the particle size of calcium phosphate powder is 300 mesh, and the purity is 85%. Raw balls with a particle size of 10-20mm are made on a granulator, and the molding pressure is 10Mpa. After molding, they are dried in an air atmosphere at 100°C for 40 minutes, placed in a sintering furnace, and heated slowly at 120°C-600°C for 80 minutes, and then continue to The temperature can be raised to about 1060°C at a speed of 5°C / min and slowly cooled down. The water absorption rate of the obtained ceramsite is 8%, and the bulk density range is 500kg / m 3 ,...

Embodiment 2

[0018] The invention provides a method for preparing lightweight porous ceramsite by using urban sewage sludge. First, the raw materials are weighed according to weight percentage: 80% of urban dewatered sludge, 15% of coal gangue powder, 1% of silicon carbide, 4% of calcium phosphate, Among them, the particle size of coal gangue powder is 600 mesh; the particle size of silicon carbide powder is 400 mesh, and the purity is 98%; the particle size of calcium phosphate powder is 500 mesh, and the purity is 90%. Raw meal balls with a particle size of 10-20mm are made on a granulator, and the molding pressure is 12Mpa. After molding, they are dried in an air atmosphere at 120°C for 40 minutes, placed in a sintering furnace, and heated slowly at 120°C-600°C for 80 minutes, and then continue to The temperature can be raised to about 1060°C at a speed of 5°C / min and slowly cooled down. The obtained ceramsite has a water absorption rate of 10% and a bulk density of 400kg / m 3 , Cylinde...

Embodiment 3

[0020] The invention provides a method for preparing lightweight porous ceramsite by using urban sewage sludge. First, the raw materials are weighed according to weight percentage: 75% of urban dewatered sludge, 18% of coal gangue powder, 2% of silicon carbide, 5% of calcium phosphate, Among them, the particle size of coal gangue powder is 400 mesh; the particle size of silicon carbide powder is 600 mesh, and the purity is 98%; the particle size of calcium phosphate powder is 600 mesh, and the purity is 90%. Raw balls with a particle size of 10-20mm are made on a granulator, and the molding pressure is 8Mpa. After molding, they are dried in an air atmosphere at 110°C for 40 minutes, placed in a sintering furnace, and heated slowly at 120°C-600°C for 80 minutes, and then continue to 8°C / min speed up to about 1060°C and slowly cool down. The water absorption rate of the obtained ceramsite is 8%, and the bulk density range is 450kg / m 3 , Cylinder compressive strength 0.6MPa. Th...

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Abstract

The invention provides a method for preparing light porous ceramsite from municipal sewage sludge. The method comprises the following steps that 1, the light porous ceramsite is prepared from, by weight, 70-80% of municipal sludge, 15-25% of coal gangue powder, 1-5% of carborundum powder and 2-10% of calcium phosphate; 2, all the components are mixed to be uniform, then, a pressing molding method is adopted for molding, the molding pressure is 5-15 Mpa, the mixture is dried in the air atmosphere under the temperature of 100-120 DEG C for 40 min after being molded, and placed into a sintering furnace, the temperature is slowly increased to 120-600 DEG C for 80 min, and then, the temperature continues to be increased at the speed of 5-10 DEG C / min to about 1,060 DEG C to obtain the light porous ceramsite can be obtained. According to the finished ceramiste, the water absorptivity is not larger than 10%, the stacking density range is not larger than 500 kg / m<3>, and the cylinder compressive strength is not smaller than 0.4 MPa. The technical index can reach the standard of GBT 17431.1-2010 'lightweight aggregate and a testing method thereof'. The method is suitable for ceramsite for buildings. Waste can be turned into wealth, environment pollution is improved, and therefore the suitable high-valued outlet is provided for sludge disposal and resource utilization, and remarkable economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to building materials and provides a method for preparing light porous ceramsite by using urban sewage sludge. Background technique [0002] Municipal sewage sludge is solid waste generated during sewage treatment. With the development of domestic sewage treatment business, the total water treatment volume and treatment degree of sewage plants will continue to expand and improve, and the amount of sludge produced will also increase day by day. In addition to a large amount of organic matter and rich nitrogen, phosphorus and other nutrients, sewage sludge also contains toxic and harmful components such as heavy metals, pathogenic bacteria and parasites. In order to prevent secondary pollution caused by sludge and ensure the normal operation and treatment effect of sewage treatment plants, the treatment and disposal of sewage sludge has become increasingly prominent in urban sewage treatment. In 1998, my country included wastewate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B33/132
CPCC04B33/132C04B33/1321C04B38/02Y02P40/60
Inventor 黄明君黄子淳何彦民罗彤罗捷文
Owner 新岛世纪(北京)新型材料技术有限公司
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