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A method of solidifying heavy metal sludge using steel slag

A technology for heavy metal sludge and steel slag, applied in dehydration/drying/thickened sludge treatment, solid waste management, sustainable waste treatment, etc., can solve problems such as solidification of heavy metal sludge, reduce consumption, reduce production costs, and realize The effect of resource utilization

Active Publication Date: 2018-08-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention not only solves the problem of stacking steel slag in the prior art, but also solves the problem of solidification of heavy metal sludge. The present invention is realized through the following technical solutions

Method used

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  • A method of solidifying heavy metal sludge using steel slag
  • A method of solidifying heavy metal sludge using steel slag

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Experimental program
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Effect test

Embodiment 1

[0014] The method for utilizing steel slag to solidify heavy metal sludge, its specific steps are as follows:

[0015] (1) Steel slag pretreatment: first crush 500g steel slag (steel slag is hot stewed steel slag, the steel slag composition table is shown in Table 1) and then screen to get particles ≤ 2mm, add water 0.12 times the particle mass, mix evenly, and seal in a constant temperature In the wet curing box, it is cured at a constant temperature of 70°C for 3 hours and then cooled to room temperature;

[0016] (2) Solidification method: first, mix steel slag, heavy metal sludge (heavy metal sludge composition is shown in Table 2), and cement according to the following mass percentages: 10% steel slag, 70% heavy metal sludge, and 20% cement to obtain a dry basis , then add 8% water on a dry basis and stir to obtain a solidified block (cylindrical body with a diameter of 50mm and a height of 50mm) by vibration pressing and molding, and the solidified block is cured in a na...

Embodiment 2

[0023] The method for utilizing steel slag to solidify heavy metal sludge, its specific steps are as follows:

[0024] (1) Steel slag pretreatment: first crush 500g steel slag (steel slag is hot stewed steel slag, the steel slag composition table is shown in Table 1) and then screen to get particles ≤ 2mm, add water 0.12 times the particle mass, mix evenly, and seal in a constant temperature In the wet curing box, it is cured at a constant temperature of 70°C for 3 hours and then cooled to room temperature;

[0025] (2) Solidification method: first, mix steel slag, heavy metal sludge (heavy metal sludge composition is shown in Table 2), and cement according to the following mass percentages: 40% steel slag, 50% heavy metal sludge, and 10% cement to obtain a dry basis , then add 8% water on a dry basis and stir to obtain a solidified block (cylindrical body with a diameter of 50mm and a height of 50mm) by vibration pressing and molding, and the solidified block is cured in a na...

Embodiment 3

[0028] The method for utilizing steel slag to solidify heavy metal sludge, its specific steps are as follows:

[0029] (1) Steel slag pretreatment: first crush 500g steel slag (steel slag is hot stewed steel slag, the steel slag composition table is shown in Table 1) and then screen to get particles ≤ 2mm, add water 0.12 times the particle mass, mix evenly, and seal in a constant temperature In the wet curing box, it is cured at a constant temperature of 70°C for 3 hours and then cooled to room temperature;

[0030] (2) Solidification method: first, mix steel slag, heavy metal sludge (heavy metal sludge composition is shown in Table 2), and cement according to the following mass percentages: 85% steel slag, 10% heavy metal sludge, and 5% cement to obtain a dry basis , then add 8% water on a dry basis and stir to obtain a solidified block (cylindrical body with a diameter of 50mm and a height of 50mm) by vibration pressing and molding, and the solidified block is cured in a nat...

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Abstract

The invention relates to a method for curing heavy metal sludge by using steel slag, and belongs to the technical field of industrial soil waste resource utilization. The method comprises the following steps: performing steel slag pretreatment, namely, firstly, crushing steel slag, screening granules less than or equal to 2mm, adding water which is 0.12 times of the mass of the granules, uniformly mixing, sealing in a constant-temperature constant-humidity maintenance box, maintaining for 3 hours at the constant temperature of 70 DEG C, and cooling to the room temperature; curing, namely, firstly, uniformly mixing the following components in percentage by mass: 10-90% of steel slag, 1-80% of heavy metal sludge and 1-20% of cement so as to obtain a dry substrate, adding water which accounts for 8% of the mass of the dry substrate, performing casting molding or vibration pressing molding so as to obtain cured blocks, and maintaining the cured blocks in a natural environment for 3-5 days. By adopting the method, not only is the piling problem of steel slag in the prior art solved, but also the problem of heavy metal sludge curing is solved.

Description

technical field [0001] The invention relates to a method for solidifying heavy metal sludge by using steel slag, and belongs to the technical field of resource utilization of industrial solid waste. Background technique [0002] Steel slag is the waste slag produced in the steelmaking process. Its formation temperature is high (about 1600 ° C), and its mineral phase composition is similar to that of cement clinker. It is a material with high activity. In 2012, the annual output of steel slag in my country reached more than 100 million tons. After years of research, domestic iron and steel enterprises, scientific research institutions and building material enterprises have made some progress in the utilization of steel slag. Steel slag has been successfully used in the fields of building materials, road engineering, agricultural production, metallurgical furnace materials and sewage treatment. However, the comprehensive utilization rate of steel slag in my country is still l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C02F11/14C04B18/14C04B18/04
CPCC02F11/14C04B28/02C04B2111/00767C04B18/142C04B18/0418Y02W30/91
Inventor 祝星韦龙华祁先进王华魏永刚李孔斋胡建杭
Owner KUNMING UNIV OF SCI & TECH
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