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A kind of method that utilizes industrial sludge to prepare cementitious material

A technology of industrial sludge and cementitious materials, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of no universality, long cycle, high sintering temperature, etc., and achieve resource utilization Effect

Active Publication Date: 2022-04-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN201810594054.3 provides a harmless recycling method for copper-nickel-containing industrial sludge, which mainly consists of three parts: chemical addition, high-temperature sintering, and chemical flotation. The advantage is that the copper and nickel in industrial sludge are effectively recycling, but this patented method is only suitable for industrial sludge containing copper and nickel, and it is not universal for general industrial sludge. The sintering temperature is too high, resulting in high cost
Patent CN201610253500.5 provides a method and preparation system for making unburned bricks from industrial sludge. It is mainly composed of three parts: dehydration roasting, mixed grinding, and aging. Its advantages are stable system operation, high output, and no secondary bricks. Pollution, but its cycle is long, aging requires high pressure and high concentration of CO2, and the conditions are relatively harsh

Method used

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  • A kind of method that utilizes industrial sludge to prepare cementitious material
  • A kind of method that utilizes industrial sludge to prepare cementitious material
  • A kind of method that utilizes industrial sludge to prepare cementitious material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dry the industrial sludge at 105°C for 1 hour, crush it through a 60-mesh sieve with a pulverizer, and then add the dried and sieved industrial sludge to the shale that has been pulverized through a 60-mesh sieve with a pulverizer. Accounting for 5% of the total mass of the dry mixture, stir at a stirring rate of 80 rpm for 20 minutes to obtain a dry mixture; after stirring the dry mixture evenly, raise the temperature to 700°C at a heating rate of 10°C / min, and roast at this temperature 2h, after cooling, the active dry mix was prepared; then the active dry mix, dimethyl dithiocarbamate, mineral powder, and fly ash were added to the cement clinker, wherein the active dry mix accounted for the total mass 5% of the total mass, 0.5% of the total mass of dimethyl dithiocarbamate, 15% of the total mass of mineral powder, 10% of the total mass of fly ash, and 69.5% of the total mass of cement clinker; Add water accounting for 20% of the total mass, place it in a mixer and st...

Embodiment 2

[0028] Dry the industrial sludge at 110°C for 1.5h, crush it through a 80-mesh sieve with a pulverizer, and then add the dried and sieved industrial sludge to the shale after pulverizing it through a 100-mesh sieve with a pulverizer. Accounting for 10% of the total mass of the dry mix, stir at a stirring rate of 140 rpm for 22 minutes to obtain a dry mix; stir the dry mix evenly, then raise the temperature to 800°C at a heating rate of 15°C / min, and roast at this temperature 1.5h, after cooling, the active dry mixture was prepared; then the active dry mixture, trisodium thiocyanate, mineral powder, and fly ash were added to the cement clinker, wherein the active dry mixture accounted for 1% of the total mass 10%, trisodium thiocyanate accounted for 1% of the total mass, mineral powder accounted for 20% of the total mass, fly ash accounted for 15% of the total mass, cement clinker accounted for 54% of the total mass; Water with a mass of 15% is placed in a mixer at a stirring r...

Embodiment 3

[0033] Dry the industrial sludge at 120°C for 2 hours, crush it through a 100-mesh sieve with a pulverizer, and then add the dried and sieved industrial sludge to the shale after pulverizing through a 80-mesh sieve with a pulverizer, of which industrial sludge accounts for 15% of the total mass of the dry mixture, stirred at a stirring rate of 200 rpm for 25 minutes to obtain a dry mixture; after stirring the dry mixture evenly, the temperature was raised to 900°C at a heating rate of 20°C / min, and roasted at this temperature for 1h , after cooling, the active dry mixture is obtained; then the active dry mixture, dimethyl dithiocarbamate, mineral powder, and fly ash are added to the cement clinker, wherein the active dry mixture accounts for 1% of the total mass 15%, dimethyl dithiocarbamate accounts for 1% of the total mass, mineral powder accounts for 25% of the total mass, fly ash accounts for 20% of the total mass, and cement clinker accounts for 39% of the total mass; Wat...

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Abstract

The invention relates to a method for preparing a cementitious material by utilizing industrial sludge. The specific steps are as follows: the industrial sludge is dried and screened, added to the screened shale, stirred evenly to obtain a dry mixture, and the dry mixture is roasted , after cooling to obtain active dry mix; then add active dry mix, chelating agent, mineral powder, fly ash to cement clinker, in which active dry mix accounts for 5-15% of the total mass, and chelating agent accounts for the total 0.5-1% of the mass, slag powder accounts for 15-25% of the total mass, fly ash accounts for 10-20% of the total mass, and cement clinker accounts for 39-69.5% of the total mass; add water and stir evenly and inject it into the mold to vibrate. The mold after grouting is cured in a constant temperature and climate incubator, and then the mold is removed; the block after mold removal is cured in a water curing box to obtain a cementitious material. The invention can utilize industrial waste according to local conditions, control environmental pollution, and has significant environmental, economic and social benefits.

Description

technical field [0001] The invention relates to a resource-based disposal of solid waste, in particular to a method for preparing gelling materials from industrial sludge. Background technique [0002] Industrial sludge refers to the sludge produced after industrial wastewater treatment. The organic components are complex and contain toxic and harmful components. Most of the industrial sludge is black or dark brown, viscous, and the particles are very fine, with a moisture content of about 60% to 70%. Industrial sludge mainly brings heavy metal pollution, soil pollution and dissolved salt pollution to the environment. The main heavy metal pollution elements of industrial sludge are Cd, Ni, Pb, Cr, Zn, Cu and so on. These heavy metals exist in the form of dissolved salts, and improper treatment will cause heavy metal pollution to water bodies and soil, and damage the environmental ecosystem. The organic matter in industrial sludge enters the ecosystem, and it is easy to br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/02C04B18/04
CPCC04B28/00C04B18/023C04B2111/00784C04B14/108C04B18/0472C04B18/08C04B18/141C04B24/16C04B22/14Y02W30/91
Inventor 刘志英徐炎华姚科程兴梁川
Owner NANJING TECH UNIV
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