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Cement-free waste incineration slag-based baking-free brick and preparation method thereof

A technology of waste incineration slag and burn-free bricks, which is applied in the field of resource utilization of waste incineration slag, and can solve the problems of poor operability, complicated operation, and low curing intensity

Active Publication Date: 2021-08-10
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology is difficult to implement in China, mainly due to two reasons: 1) a large amount of water consumption; 2) as time goes on, the curing effect of the chelating agent weakens, and it is easy to cause secondary heavy metal leakage; 3) waste incineration slag in China There is a lot of free calcium oxide in it, and it is easy to solidify with water, and the operability is not strong; 4) The curing treatment intensity is low, the operation is complicated, and a large amount of active adhesive needs to be added, and the cost of resource utilization is high, so that the secondary utilization is restricted. extremely restrictive

Method used

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  • Cement-free waste incineration slag-based baking-free brick and preparation method thereof
  • Cement-free waste incineration slag-based baking-free brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An unburned brick, comprising the following components in parts by mass:

[0036] 6 parts of waste incineration slag, 2 parts of metakaolin and 3 parts of alkali activator;

[0037] The waste incineration slag contains by mass percentage: 45.3% CaO, 15% SiO 2 , 6.8% Fe 2 o 3 and 3.1% Al 2 o 3 ; The heavy metal elements contained in the waste incineration slag are Cu (1586ppm), Zn (8460ppm), Pb (1450ppm) and Cr (950ppm);

[0038] The alkali activator includes, by mass percentage, 30% of liquid sodium silicate, 6% of NaOH and the rest of water; wherein, the modulus of the liquid sodium silicate is 3.1.

[0039] The preparation method of above-mentioned burn-free brick is:

[0040] a. Grinding the waste incinerator slag to a particle size of ≤75 μm and mixing it evenly with the above-mentioned metakaolin and alkali activator to obtain a semi-dry material;

[0041] b. Add the semi-dry material into the mold, hold the pressure at 10KN for 35s, and obtain the forming t...

Embodiment 2

[0044] An unburned brick, comprising the following components in parts by mass:

[0045] 7 parts of waste incineration slag, 3 parts of rice husk ash and 4 parts of alkali activator;

[0046] The waste incineration slag contains by mass percentage: 47.3% CaO, 16.6% SiO 2 , 7.4% Fe 2 o 3 and 4.2% Al 2 o 3 ; The heavy metal elements contained in the waste incineration slag are Cu (1588ppm), Zn (8544ppm), Pb (1670ppm) and Cr (1010ppm);

[0047] The alkali activator includes, by mass percentage, 32% of liquid sodium silicate, 6.5% of NaOH and the rest of water; wherein, the modulus of the liquid sodium silicate is 3.2.

[0048]The preparation method of above-mentioned burn-free brick is:

[0049] a. Grinding the waste incinerator slag to a particle size of ≤75 μm and mixing it evenly with the above-mentioned rice husk ash and alkali activator to obtain a semi-dry material;

[0050] b. Add the semi-dry material into the mould, hold the pressure at 12KN for 30s, and obtain th...

Embodiment 3

[0053] An unburned brick, comprising the following components in parts by mass:

[0054] 8 parts of garbage incineration slag, 4 parts of volcanic ash and 5 parts of alkali activator;

[0055] The waste incineration slag contains by mass percentage: 49.9% CaO, 20% SiO 2 , 8% Fe 2 o 3 and 4.8% Al 2 o 3 ; The heavy metal elements contained in the waste incineration slag are Cu (1662ppm), Zn (8820ppm), Pb (1433ppm) and Cr (960ppm);

[0056] The base activator includes, by mass percentage: 34% liquid sodium silicate, 7% NaOH and the rest of water; wherein, the modulus of the liquid sodium silicate is 3.3.

[0057] The preparation method of above-mentioned burn-free brick is:

[0058] a. Grinding the waste incinerator slag to a particle size of ≤75 μm and mixing it evenly with the above-mentioned pozzolan and alkali activator to obtain a semi-dry material;

[0059] b. Add the semi-dry material into the mould, hold the pressure at 15KN for 25s, and obtain the forming test pie...

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Abstract

The invention relates to the technical field of resource utilization of waste incineration slag, and particularly discloses a cement-free waste incineration slag-based baking-free brick and a preparation method thereof. The cement-free waste incineration slag-based baking-free brick comprises the following components in parts by mass: 6-8 parts of waste incineration slag, 2-4 parts of an admixture and 3-5 parts of an alkali activator. The preparation method of the cement-free waste incineration slag-based baking-free brick comprises the steps of a, grinding the waste incineration slag, and uniformly mixing the ground waste incineration slag with the admixture and the alkali activator to obtain a semi-dry material; b, adding the semi-dry material into a mold for compression molding to obtain a molded test block; and c, curing the molded test block to obtain the baking-free brick. The cement-free waste incineration slag-based baking-free brick provided by the invention has the advantages of simple materials, low cost, high use strength, good curing effect of heavy metal elements, difficulty in leaching and large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of waste incineration slag resource utilization, in particular to a cement-free waste incinerator slag-based burn-free brick and a preparation method thereof. Background technique [0002] Household garbage is a major problem in the process of urbanization. Waste disposal has always been a daunting task due to the huge volume of waste discharged every day, with a wide variety of compositions and high fluctuations. Safe, environmentally friendly and efficient disposal methods have always been a major research goal of researchers in many countries. At present, the method adopted by most countries in the world is waste incineration. However, after garbage incineration, a large amount of slag will be produced, and a large amount of heavy metal elements are enriched in the incineration slag, which is extremely polluting and toxic. Japanese scientists add an organic chelating agent solution to the incinerator s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/006C04B2111/00017C04B2201/50C04B2201/20C04B18/10C04B14/106C04B22/00C04B22/062C04B40/0259C04B18/101C04B14/14Y02W30/91
Inventor 邵宁宁董志君金宇杜尚波
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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