A process for preparing ultra-light filler from waste incineration fly ash

A waste incineration fly ash and process technology, which is applied in the production of ceramic products, clay products, ceramic materials, etc., can solve the problems of long firing time and low process efficiency, and achieve short firing time, low consumption and long disposal cycle short effect

Active Publication Date: 2019-04-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The firing of ultra-light fillers generally adopts a preheating-sintering two-step roasting process: room temperature-uniform heating-preheating temperature (keep a certain time)-uniform heating-sintering temperature (keep a certain time), this process The disadvantage is that the firing time is long and the process efficiency is low

Method used

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  • A process for preparing ultra-light filler from waste incineration fly ash
  • A process for preparing ultra-light filler from waste incineration fly ash
  • A process for preparing ultra-light filler from waste incineration fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Zeolite, sodium dihydrogen phosphate and magnesium oxide are mixed according to a certain mass ratio, zeolite accounts for 20% of the mass of the mixture, sodium dihydrogen phosphate accounts for 45% of the mass of the mixture, and magnesium oxide accounts for 35% of the mass of the mixture, fully stirred, mixed evenly, and prepared into a complex heavy metal stabilizer. Waste incineration fly ash, compound heavy metal stabilizer and shale are ground and passed through a 100-mesh sieve; wood chips are crushed and passed through a 32-mesh sieve. Filler raw materials are composed according to the following proportions by weight: 20 parts of waste incineration fly ash, 2 parts of composite heavy metal stabilizer, 12 parts of sawdust, and 66 parts of shale; React for 40 minutes, granulate after cooling, and make raw meal balls. The raw material balls were dried in an oven at 100°C for 4 hours; then moved into a box-type resistance furnace heated to 1100°C, and roasted for ...

Embodiment 2

[0028] Zeolite, sodium dihydrogen phosphate and magnesium oxide are mixed according to a certain mass ratio, zeolite accounts for 25% of the mass of the mixture, sodium dihydrogen phosphate accounts for 50% of the mass of the mixture, magnesium oxide accounts for 25% of the mass of the mixture, fully stirred, mixed evenly, and prepared into a complex heavy metal stabilizer. Waste incineration fly ash, compound heavy metal stabilizer and shale are ground and passed through a 100-mesh sieve; straw is crushed and passed through a 32-mesh sieve. Filler raw materials are composed according to the following proportions by weight: 38 parts of waste incineration fly ash, 5 parts of composite heavy metal stabilizer, 8 parts of straw, and 49 parts of shale; React for 30 minutes, granulate after cooling, and make raw meal balls. The raw material balls were dried in an oven at 110°C for 3 hours; then moved into a box-type resistance furnace heated to 1150°C, and roasted for 15 minutes; a...

Embodiment 3

[0034] Zeolite, sodium dihydrogen phosphate and magnesium oxide are mixed according to a certain mass ratio, zeolite accounts for 30% of the mass of the mixture, sodium dihydrogen phosphate accounts for 55% of the mass of the mixture, and magnesium oxide accounts for 15% of the mass of the mixture, fully stirred, mixed evenly, and prepared into a complex heavy metal stabilizer. Waste incineration fly ash, compound heavy metal stabilizer and fly ash are ground and passed through a 100-mesh sieve; rice husks are crushed and passed through a 32-mesh sieve. Filler raw materials are composed according to the following proportions by weight: 56 parts of waste incineration fly ash, 8 parts of composite heavy metal stabilizer, 4 parts of rice husk, and 32 parts of fly ash; React in a water bath for 20 minutes, granulate after cooling, and make raw meal balls. The raw material balls were dried in an oven at 120°C for 2 hours; then moved into a box-type resistance furnace heated to 120...

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Abstract

The invention relates to a technology for preparing an ultra-light filler from solid waste incineration fly ash. The solid waste incineration fly ash serves as the raw material, shale or pulverized fuel ash serves as the auxiliary material, wood dust or straw or rice hull serves as a pore-forming agent, a small amount of compound heavy metal stabilizer is doped, all the materials are mixed according to certain proportions, and the ultra-light filler which is small in heavy metal leaching rate is prepared through the steps of water adding stirring, water-bath reacting, granulating, drying and sintering. Firing of the filler adopts a rapid sintering schedule without a preheating stage, that is to say, material pellets are suddenly heated to sintering temperature from room temperature, and uniform temperature increasing and the preheating process are not conducted midway. The technology is short in consumed time and high in efficiency, and the prepared filler is light, porous and high in strength. Compared with a conventional solid waste incineration fly ash treatment and disposal way, the technology has the advantages of being low in operation cost, short in disposal period, less in secondary pollution, high in waste utilization rate and the like.

Description

technical field [0001] The invention relates to a resource recovery process of hazardous solid waste, in particular to a process for preparing ultra-light filler from waste incineration fly ash. Background technique [0002] Waste incineration will produce a certain amount of waste incineration ash, among which the substances collected in the heat recovery system and flue gas purification system, that is, waste incineration fly ash, often account for 5% to 10% of the amount of waste incinerated, or even 10% to 15%. Fly ash is generally off-white or dark gray, with a particle size of less than 300 μm, a moisture content of 5% to 15%, a heat loss rate of 34% to 51%, and various particle shapes. The pollution caused by fly ash to the environment mainly includes heavy metal pollution, dioxin pollution and dissolved salt pollution. The main heavy metal pollution elements in fly ash are Pb, Cd, Hg and Zn. In the process of waste incineration, due to incomplete incineration due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B38/06C04B33/135
CPCC04B33/1355C04B38/009C04B38/0675C04B2235/3206C04B2235/3472C04B2235/77Y02P40/60
Inventor 刘志英徐炎华刘杨朱明新徐学骁
Owner NANJING TECH UNIV
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