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Resource recycling method for preparing cementing material from incineration fly ash

A technology of fly ash incineration and recycling, which is applied in the field of resource utilization of hazardous waste, can solve problems such as difficult wastewater treatment, and achieve the effects of solid waste reuse, low solidification cost, and high degree of equipment automation

Pending Publication Date: 2021-08-06
天津金石建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the resource utilization of fly ash (hazardous waste) in the field of building materials mainly includes the preparation of cement and concrete, geopolymer materials, glass-ceramic, and ceramsite, but there are still certain problems: fly ash (hazardous waste) Usually, it needs to be washed and pretreated before subsequent resource utilization. Washing wastewater often contains high concentrations of chloride salts, sulfur, heavy metals, etc., and the treatment of wastewater is relatively difficult; the formation of geopolymer materials using fly ash (hazardous waste) The mechanism still needs further study

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A resource recycling method for preparing incineration fly ash into a cementitious material, characterized in that it comprises the following steps:

[0023] (1) Centrifuge the incineration fly ash by gas suspension to separate the fly ash rich in potassium salt, sodium salt, calcium salt and heavy metal in the waste incineration fly ash, and use dilute phase negative pressure to transport , input to different vacuum hoppers.

[0024] The main factor affecting the use value of fly ash is the carbon content. The decarbonization treatment of fly ash, and then centrifugal separation and classification according to particle size and weight can not only reduce the secondary pollution of fly ash, but also increase the number of fly ash particles. High strength, improved utilization value, and easy design of hyperon particle assembly scheme and materials required for coating.

[0025] (2) Analyze the relevant components of incineration fly ash by batch, and calculate the prop...

Embodiment 2

[0034] A resource recycling method for preparing incineration fly ash into a cementitious material, characterized in that it comprises the following steps:

[0035] (1) Centrifuge the incineration fly ash by gas suspension to separate the fly ash rich in potassium salt, sodium salt, calcium salt and heavy metal in the waste incineration fly ash, and use dilute phase negative pressure to transport , input to different vacuum hoppers.

[0036] (2) Analyze the relevant components of incineration fly ash by batch, and calculate the proportion of fly ash and curing agent according to the analysis results;

[0037] Further, in step (2), the curing agent is mainly compounded from silicon dioxide, nickel ore powder, fly ash, calcium silicate, bauxite and the like.

[0038] Further, in step (2), the composition ratio of the curing agent is: 20% silicon dioxide, 50% nickel ore powder, 25% fly ash, 3% calcium silicate, 2% aluminum alum earth.

[0039] (3) Superfine the fly ash into fl...

Embodiment 3

[0044] A resource recycling method for preparing incineration fly ash into a cementitious material, characterized in that it comprises the following steps:

[0045] (1) Centrifuge the incineration fly ash by gas suspension to separate the fly ash rich in potassium salt, sodium salt, calcium salt and heavy metal in the waste incineration fly ash, and use dilute phase negative pressure to transport , input to different vacuum hoppers.

[0046] (2) Analyze the relevant components of incineration fly ash by batch, and calculate the proportion of fly ash and curing agent according to the analysis results;

[0047] Further, in step (2), the curing agent is mainly compounded from silicon dioxide, nickel ore powder, fly ash, calcium silicate, bauxite and the like.

[0048] Further, in step (2), the composition ratio of the curing agent is: 20% silicon dioxide, 60% nickel ore powder, 10% fly ash, 5% calcium silicate, 5% aluminum alum earth.

[0049](3) fly ash is ultrafine into fly ...

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Abstract

The invention belongs to the technical field of hazardous waste resource utilization, and provides a resource recycling method for preparing a cementing material form incineration fly ash. Fly ash is encapsulated by an inorganic curing agent in a physical mode, the fly ash rich in heavy metal or chloride ions is cured / stabilized, mineral powder particles are wrapped with fly ash particles again, a waterproof inert protective layer is formed on the surface, and a new cementing material is generated. The whole production process is closed, low-temperature and high-temperature calcination and chemical reaction are avoided, zero discharge of solid waste is realized, and secondary pollution of pollutants is fundamentally solved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of hazardous waste, and in particular relates to a resource utilization method for preparing incineration fly ash into a gelling material. Background technique [0002] When traditional fly ash (hazardous waste) is used as cement, its dosage should not be too large, generally no more than 10%, otherwise it will have a negative impact on the strength of cement-based materials, which is not conducive to the subsequent use of products, and a low dosage is also not conducive to The digestion and utilization of a large amount of fly ash at present. Fly ash (hazardous waste) and other inorganic materials are separately ground and processed, then assembled and packaged, and the prepared cementitious material products exhibit better compressive and flexural strength, low energy consumption, and are environmentally friendly and pollution-free. The fly ash content above or below 10% has little...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00
CPCC04B12/00
Inventor 孙朝惜
Owner 天津金石建材科技有限公司
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