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Ceramsite preparation process

A technology, ceramsite technology, applied in the field of resource disposal of industrial solid waste, to achieve good environmental benefits

Inactive Publication Date: 2012-07-04
李玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sludge used to make ceramsite is mainly river bottom sludge, residual sludge from domestic sewage treatment and municipal sludge, and there are few reports on the research on ceramsite made from chemical sludge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the remaining sludge with a mass water content of 75%, and dry it at 110°C for 10 hours; respectively take 50g of dried sludge, 30g of clay, 10g of fly ash, and 10g of zeolite powder, and put them into the mixing basin respectively, and after fully stirring and mixing, Add water until the mass moisture content is 12%, granulate after stirring and mixing to obtain raw meal balls; after drying the raw meal balls at 80°C for 12 hours, raise the temperature to 1250°C at a heating rate of 15°C / min, and sinter for 15 minutes ; After cooling, ceramsite is obtained. After testing, its bulk density is 0.87g / cm. , the cylinder compressive strength is 3.83M[, a, the heavy metal leaching test results are shown in Table 1.

Embodiment 2

[0025] Take the remaining sludge with a mass moisture content of 80%, and dry it at 120°C for 4 hours; respectively take 40g of dried sludge, 20g of clay, and 20g of zeolite powder, and put them into the mixing basin, stir and mix well, and add water to control the mass moisture content. 10%, stir and granulate to obtain raw meal balls; dry the raw meal balls at 1()()°C for 6 hours, then raise the temperature to 1200°C at a heating rate of 25°C / min, and sinter for 12 minutes; after cooling, That is, the ceramsite was obtained, and the bulk density was 0.85g / cm after testing. , the cylinder compressive strength is 4.4MPa, and the heavy metal leaching test results are shown in Table 1.

Embodiment 3

[0027] Take the remaining sludge with a mass water content of 85%, and dry it at 105°C for 24 hours; take 35g of dried sludge, 20g of clay, 25g of fly ash, and 20g of zeolite powder, respectively, and put them into the mixing basin, fully stir and mix, add water Control the mass moisture content to 8%; granulate after stirring and mixing to obtain raw meal balls; dry the raw meal balls at 105°C for 4 hours, then raise the temperature to 1150°C at a heating rate of 30°C / min, and sinter for 10 minutes; After cooling, ceramsite is obtained. After testing, its bulk density is 0.89g / cm. , the cylinder compressive strength is 4.OM[, a, the heavy metal leaching test results are shown in Table 1.

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Abstract

The invention relates to a resource process of industrial solid wastes and discloses a process for burning ceramiste by chemical excess sludge. The process comprises the steps of: agitating the sludge that is mechanically dehydrated after drying, blending, dry-mixing and water filling; prilling to obtain raw nodules; and drying the raw nodules and roasting the raw nodules at 1050-1300 DEG C to form sludge ceramsite. The leaching concentration of heavy metal is far lower than GB5085.32007 (leaching toxicity identification of hazardous waste identifying standard). The process not only reduces energy consumption and has low production cost, but also creates a novel way for resource treatment of sludge by means of treating waste with waste and recycling the wastes. The invention has obvious environmental and economic benefits.

Description

technical field [0001] The invention relates to resource disposal of industrial solid waste, in particular to a preparation process of ceramsite. Background technique [0002] At present, more than 90% of the sewage treatment in the world adopts the activated sludge method to treat sewage, and the sludge accounting for 0.5% to 1.0% of the sewage volume will be generated during the treatment process. Sludge has high moisture content, large volume, perishable, complex composition, and contains chemical residues, harmful, refractory organic matter, pathogenic bacteria, parasites (eggs) and heavy metals, etc. The treatment cost is high, accounting for about 40% of the operating cost of the entire sewage process ~60%. Traditional sludge treatment and disposal methods, such as landfill, sea discharge, and incineration, have their own advantages and disadvantages, and they will have varying degrees of impact on the environment. The reduction and recycling of sludge can not only r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/00C04B33/132
CPCY02P40/60
Inventor 李玲
Owner 李玲
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