Method for preparing haydite from sludge incineration ash in chemical industry

A technology for chemical sludge and incineration ash, which is applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., to achieve the effect of easy industrialization, good environmental and social benefits, and resource utilization

Active Publication Date: 2011-11-23
江苏江淮环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, 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 preparation of ceramsite from chemical sludge incineration ash, which belongs to hazardous waste.

Method used

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  • Method for preparing haydite from sludge incineration ash in chemical industry

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Experimental program
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Effect test

Embodiment 1

[0026] Dry the remaining sludge with a mass moisture content of 75% at 110°C for 8 hours, incinerate the dried sludge at 1200°C for 30 minutes, grind it, and pass it through a 30-mesh sieve; take 50g of sludge incineration ash, clay 18g, 30g of fly ash, and 2g of aluminum powder were respectively put into the mixing basin, fully stirred and mixed, and water was added to control the mass moisture content to 10%; after mixing, granulated to obtain raw meal balls; after drying at 80°C for 12 hours, control The heating rate is 15°C / min, and it is sintered at 1050°C for 15 minutes to obtain ceramsite. After testing, its bulk density is 0.65g / cm 3 , the cylinder compressive strength is 3.1MPa, and the heavy metal leaching test results are shown in Table 1.

Embodiment 2

[0028] Dry the remaining sludge with a mass moisture content of 85% at 120°C for 6 hours, incinerate the dried sludge at 1250°C for 10 minutes, grind it, and pass it through a 60-mesh sieve; Put 39g of clay and 1g of aluminum powder into the mixing basin respectively, stir and mix well, add water to control the moisture content of the mass to 15%, granulate after mixing, and obtain raw meal balls; after drying at 100°C for 6 hours, control the heating rate to 25°C / min, sintered at 1100°C for 12 minutes to obtain ceramsite. After testing, its bulk density is 0.73g / cm 3 , the cylinder compressive strength is 3.5MPa, and the heavy metal leaching test results are shown in Table 1.

Embodiment 3

[0030] Dry the remaining sludge with a mass moisture content of 85% at 105°C for 24 hours, incinerate the dried sludge at 1250°C for 20 minutes, grind it, and pass it through a 100-mesh sieve; take 55g of sludge incineration ash, clay 19.5g, 25g of fly ash, and 0.5g of aluminum powder were respectively put into the mixing basin, fully stirred and mixed, and water was added to control the moisture content to 8%; after mixing, granulated to obtain raw meal balls; after drying at 105°C for 4 hours, Control the heating rate to 30°C / min, and sinter at 1150°C for 10 minutes to obtain ceramsite. After testing, its bulk density is 0.8g / cm 3 , the cylinder compressive strength is 4.0MPa, and the heavy metal leaching test results are shown in Table 1.

[0031] Table 1 Analysis of heavy metal content in leaching solution of ceramsite leaching toxicity identification test

[0032]

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Abstract

The invention relates to recycling of industrial solid waste, and discloses a method for preparing haydite from sludge incineration ash in chemical industry. The method comprises the following steps: drying sludge subjected to mechanical dewatering, incinerating at high temperature, proportioning, carrying out dry mixing, adding water, evenly mixing, granulating to obtain fresh pellets, drying the fresh pellets, and roasting at 1050-1150 DEG C to form sludge haydite. The leaching concentration of heavy metals is far below GB 5085.3-2007 (Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity). The method has the advantages of low energy consumption and low production cost, develops a new way for recycling sludge in the fields of waste treatment with waste andcyclic utilization of waste, and has obvious environmental benefit and economic benefit.

Description

technical field [0001] The invention relates to resource disposal of industrial solid waste, in particular to a method for preparing ceramsite by utilizing chemical sludge incineration ash. 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 redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C02F11/00
Inventor 徐炎华胡俊夏霆尤朝阳
Owner 江苏江淮环保科技有限公司
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