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A method for preparing ceramsite from chemical sludge

A technology for chemical sludge and drying sludge, which is applied in the production of clay products, ceramic materials, and other household appliances to achieve good environmental benefits.

Inactive Publication Date: 2011-12-21
NANJING UNIV OF TECH
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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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  • A method for preparing ceramsite from chemical sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take the remaining sludge with a mass water content of 75%, dry it at 120°C for 5 hours, take 50g of dried sludge, 13g of clay, 20g of fly ash, and 7g of heavy oil respectively, and put them into the mixing basin respectively, and after fully stirring and mixing, Add water to control the mass moisture content to 10%, stir and mix well and granulate to obtain raw meal balls; after drying at 80°C for 12 hours, heat at 400°C for 0.5h at a heating rate of 20°C / min; then heat at 15°C / min heating rate, heating up to 1150°C, holding for 10min; after cooling, ceramsite is obtained. After testing, its bulk density is 0.76g / cm 3 , the cylinder compressive strength is 4.4MPa, and the heavy metal leaching test results are shown in Table 1.

Embodiment 2

[0026] Take the remaining sludge with a mass water content of 80%, dry it at 110°C for 9 hours, take 30g of dried sludge, 15g of clay, 50g of fly ash, and 5g of heavy oil respectively, and put them into the mixing basin respectively, and after fully stirring and mixing, Add water to control the mass moisture content to 30%, stir and mix well, and then granulate to obtain raw meal balls; after drying at 100°C for 6 hours, raise the temperature to 400°C at a heating rate of 10°C / min, and keep it warm for 1 hour; Min heating rate, at 1100 ° C for 12 minutes; after cooling, ceramsite is obtained. After testing, the bulk density is 0.80g / cm 3 , the cylinder compressive strength is 4.63MPa, and the heavy metal leaching test results are shown in Table 1.

Embodiment 3

[0028] Take the remaining sludge with a mass moisture content of 85%, and dry it at 105°C for 24 hours. Take 45g of dried sludge, 15g of clay, 25g of feldspar powder, and 10g of heavy oil, respectively, and put them into the mixing basin. After fully stirring and mixing, add water , control the mass moisture content to 9%, stir and mix and granulate to obtain raw meal balls; after drying at 105°C for 4 hours, raise the temperature to 450°C at a heating rate of 15°C / min, and keep warm for 1h; then at 20°C / min Min heating rate, heating up to 1200 ℃, heat preservation 10min; after cooling, ceramsite is obtained. After testing, the bulk density is 0.5g / cm 3 , the cylinder compressive strength is 3.78MPa, and the heavy metal leaching test results are shown in Table 1.

[0029] Table 1 Analysis of heavy metal content in leaching solution of ceramsite leaching toxicity identification test

[0030]

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Abstract

The invention relates to a recycling process of industrial solid wastes and provides a method for preparing hadite from chemical sludge. The method comprises the steps of firstly drying sludge treated by mechanical press-filtering and dewatering in chemical enterprises, proportioning, carrying out dry mixing, adding water, uniformly stirring and mixing, granulating to obtain raw material pellets,drying the raw material pellets, baking at a high temperature according to a preset sintering system and cooling to prepare sludge-based hadite. The extraction concentration of heavy metals in the hadite is far lower than GB 5085.3-2007 (Identification standards for hazardous wastes-Identification for extraction toxicity). The method develops a new way for sludge recycling, has significant environmental benefits, economical benefits and social benefits, and meets the industrial policy guidance of developing circular economy in China.

Description

technical field [0001] The invention relates to resource disposal of industrial solid waste, in particular to a method for preparing ceramsite from chemical sludge. 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 sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132
CPCY02P40/60
Inventor 赵浩徐炎华孙文全
Owner NANJING UNIV OF TECH
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