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Resource utilization method of household garbage incineration residue sorting tailing

A domestic waste incineration and waste incineration technology, which is applied in the field of comprehensive utilization of solid waste resources, can solve problems affecting the strength of road construction materials, the impact of clinker calcination process, and large dry shrinkage of block products, so as to achieve resource utilization and large-scale treatment, high slag addition ratio, and low product cost

Active Publication Date: 2016-02-03
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent CN101386480A discloses a method of producing Portland cement clinker by using domestic waste incineration slag, which is improved on the basis of the existing new dry process cement kiln, and slag is used to replace part of clay and limestone to produce silicic acid Salt cement clinker, but the harmful components (alkali, chlorine, etc.) brought into the raw meal by incineration slag will still have a negative impact on the clinker calcination process after treatment
Invention patent CN1558030A discloses a method for making a civil engineering structure layer with domestic waste incineration slag. The incineration slag is used as aggregate for the road base of municipal roads or as an alternative soil source as a covering material for domestic waste landfills. Some heavy metals contained in the slag It is very easy to cause secondary pollution and has a potential impact on the environment. Moreover, these heavy metal substances and the unstable free calcium oxide and free magnesium oxide in them will affect the strength of road construction materials from the physical and chemical aspects, and the durability is poor.
Most of the foam concrete cementitious materials are produced with cement and fly ash as the main ingredients. After the cement is completely hydrated, the block products will shrink greatly, and the preparation cost is relatively high.

Method used

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  • Resource utilization method of household garbage incineration residue sorting tailing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare foam concrete blocks as follows:

[0049] 1) Fine grinding: Grinding the remaining tailings after sorting out iron, aluminum, copper, zinc, gold, silver and other metals from the waste incineration plant slag, the particle size is 700cm in specific surface area 2 / g; The finely ground tailings powder is directly dried with hot flue gas to obtain sorted tailings micropowder with a moisture content of 1% and free CaO and MgO contents <1%.

[0050] 2) Mixture preparation: dry-mix the fine powder of sorted tailings with cement and early strength agent in proportion, and the mixing time is 10 minutes. Ordinary Portland cement is used for cement; the ratio of sorted tailings micropowder:cement is 3:7; the early strength agent is sodium silicate and triethanolamine compounded at 1:1, and the addition ratio is cement and sorted tailings micropowder dry basis 1% of the total amount.

[0051] 3) Foam preparation: Dilute the foaming agent 50 times with water and stir sli...

Embodiment 2

[0058] Prepare foam concrete blocks as follows:

[0059] 1) Fine grinding: Grinding the remaining tailings after sorting out iron, aluminum, copper, zinc, gold, silver and other metals from the waste incineration plant slag, the particle size is 400cm in specific surface area 2 / g; The finely ground tailings powder is directly dried with hot flue gas to obtain sorted tailings micropowder with a moisture content of 0.5% and free CaO and MgO contents <1%.

[0060] 2) Mixture preparation: dry-mix the fine powder of sorted tailings with cement and early strength agent in proportion, and the mixing time is 5 minutes. Ordinary Portland cement is used for cement; the ratio of sorted tailings micropowder:cement is 4:6; the early strength agent is calcium chloride, and the addition ratio is 3% of the total dry basis of cement and sorted tailings micropowder.

[0061] 3) Foam preparation: Dilute the foaming agent 30 times with water and stir slightly evenly, and then use a cement foami...

Embodiment 3

[0068] Prepare the insulation material as follows:

[0069] 1) Fine grinding: Grinding the remaining tailings after sorting out iron, aluminum, copper, zinc, gold, silver and other metals from the waste incineration plant slag, the particle size is 500cm in specific surface area 2 / g; The finely ground tailings powder is directly dried with hot flue gas to obtain sorted tailings micropowder with a moisture content of 0.3% and free CaO and MgO contents <1%.

[0070] 2) Mixture preparation: dry-mix the sorted tailings fine powder with cement and early strength agent in proportion, and the mixing time is 7 minutes. Ordinary Portland cement is used for cement; the ratio of sorted tailings powder: cement is 1:19; the early strength agent is sodium sulfate and urea compounded at 1:1, and the addition ratio is the total amount of cement and sorted tailings powder on a dry basis 2%.

[0071] 3) Foam preparation: Dilute the foaming agent 40 times with water and stir slightly evenly, ...

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Abstract

The invention relates to a resource utilization method of household garbage incineration residue sorting tailing. The household garbage incineration residue sorting tailing is subjected to fine grinding treatment and is directly dried by utilizing hot smoke, the obtained residue micro powder is forcedly mixed with cement, and processes such as pulping, bubble forming, mixing and soaking, casting moulding, low-temperature oxygen steaming, normal-temperature maintenance and the like are carried out, so that a foam concrete block or a thermal insulation material is prepared. The resource utilization method of the household garbage incineration residue sorting tailing has the advantages that negative effect of free calcium oxide and magnesium oxide on quality of foam concrete is eliminated, and final strength of a foam concrete product is improved; under the combined action of hydration products of cement, and toxic trace heavy metals are solidified, so that a tailing product produces no secondary pollution to the environment; and residue adding proportion is high, resource utilization and large-scale treatment on the garbage incineration residue sorting tailing can be realized, technology is simple, product cost is low, and good economic benefit and environmental benefit are realized.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources, in particular to a method for resource utilization of domestic waste incineration slag sorting tailings. Background technique [0002] Domestic waste incineration power generation has been widely used in my country. Its advantages are: after incineration, the volume of waste can be reduced by more than 70%, which can solve the problems of high land cost of landfill and inability to meet the landfill capacity requirements. The high-temperature gas produced by waste incineration Energy can be recovered and reused. Incineration slag is a by-product of the waste incineration process, mainly including residues on the grate and particles falling from between the grates, and its output accounts for about 20%-30% of the mass of the original garbage. Since garbage is the end point of metal substances in social life, the fine-grained slag is regarded as the raw material for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B38/10C04B18/10
CPCY02W30/91
Inventor 余广炜汪印余铖王兴栋李智伟李春星
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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