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A method for solidifying chromium-containing solid waste

A solid waste and solid content technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of poor anti-leaching performance, threats to human health, and high cost, so as to increase the amount of leaching and facilitate Capturing detoxifying, cost-saving effects

Active Publication Date: 2021-11-09
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for short-term solidification and sealing of chromium-containing waste. Due to the poor leaching resistance of conventional solidified bodies, coating treatment must be carried out, and the cost is relatively high.
As disclosed in Chinese patent application CN108218270A, a method of utilizing industrial waste to prepare waterproof and antibacterial cement directly uses chromium slag as an antibacterial active ingredient. threat to human health

Method used

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  • A method for solidifying chromium-containing solid waste
  • A method for solidifying chromium-containing solid waste
  • A method for solidifying chromium-containing solid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The method for solidifying chromium-containing solid waste in this embodiment comprises the following steps in turn:

[0046] (1) Take the chromium slag and refine it until the median particle size is less than 1mm, then add water to mix and stir to prepare slurry A with a solid content of 15%;

[0047] (2) Take 100 parts by mass of slurry A and pump it into a wet mill for wet grinding until the median particle size reaches 2 μm to obtain slurry B;

[0048] (3) Add 20 parts by mass of steel slag powder with a median particle size of 20 μm and 5 parts by mass of polymaleic acid to slurry B, mix them uniformly, and then wet grind them again until the particle size is 2 μm to obtain slurry C;

[0049] The following wet grinding process parameters are used in steps (2) and (3):

[0050] The grinding medium is zirconium silicate grinding balls with a particle size of 0.5~3.0mm, the filling rate of the grinding medium is 60%~70%, the ball material ratio is 1:2~1:4, and the s...

Embodiment 2

[0061] The method for solidifying chromium-containing solid waste in this embodiment comprises the following steps in turn:

[0062] (1) Take the chromium salt mud and refine it until the median particle size is less than 1mm, then add water to mix and stir to prepare slurry A with a solid content of 20%;

[0063] (2) Take 100 parts by mass of slurry A and pump it into a wet mill for wet grinding until the median particle size reaches 1 μm to obtain slurry B;

[0064] (3) Add 20 parts by mass of steel slag powder with a median particle size of 60 μm and 1 part by mass of sodium stearate to slurry B, mix well and then wet grind again until the median particle size is 4 μm to obtain slurry C ;

[0065] The wet grinding process parameters in steps (2) and (3) are the same as those in Example 1, and will not be repeated here.

[0066] (4) Gradually add 8 parts by mass of industrial by-product gypsum powder to slurry C until the pH value of the slurry is 11 to obtain slurry D;

...

Embodiment 3

[0076] The method for solidifying chromium-containing solid waste in this embodiment comprises the following steps in turn:

[0077] (1) Take the chromium slag and refine it until the median particle size is less than 1mm, then add water to mix and stir to prepare slurry A with a solid content of 18%;

[0078] (2) Take 100 parts by mass of slurry A and pump it into a wet mill for wet grinding until the median particle size is 2 μm to obtain slurry B;

[0079] (3) Add 23 parts by mass of steel slag powder with a median particle size of 40 μm and 3 parts by mass of sodium dodecylbenzenesulfonate to slurry B, mix well and then wet mill again until the median particle size is 2 μm, Obtain slurry C;

[0080] The wet grinding process parameters in steps (2) and (3) are the same as those in Example 1, and will not be repeated here.

[0081] (4) Gradually add 10 parts by mass of industrial by-product gypsum powder to slurry C until the pH value of the slurry is 7 to obtain slurry D;...

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Abstract

The invention discloses a method for solidifying chromium-containing solid waste, comprising the steps of: (1) refining the chromium-containing solid waste to a particle size of less than 1mm, adding water and mixing and stirring to prepare slurry A with a solid content of 15-20% ; (2) Take 100 parts by mass of slurry A and pump it into a wet mill for wet grinding until the particle size is 1-2 μm to obtain slurry B; (3) Add 20-25 parts by mass, particle size 20 ~60μm steel slag powder and 1~5 parts by mass of plasticizer are wet ground again to obtain slurry C with a particle size of 2~4μm; (4) Gradually add 2~10 parts by mass of industrial by-products to slurry C Gypsum powder, adjust the pH value of the slurry to 7~11 to obtain slurry D; (5) Use slurry D to partially or completely replace the cementitious material for concrete production. The invention uses steel slag as reducing raw material and wet grinding to dispose chromium-containing solid waste, and applies the disposed chromium-containing solid waste to building material production, which can effectively seal chromium element and create economic benefits.

Description

technical field [0001] The invention belongs to the field of chromium-containing solid waste treatment, and in particular relates to a method for solidifying chromium-containing solid waste. Background technique [0002] Metallic chromium and chromium salts are important strategic substances, about 10% of commodities are related to it. During the production of metallic chromium and chromium salts, chromium-containing solid wastes will be discharged. For every ton of metallic chromium produced, 7 tons of chromium-containing wastes will be generated, and for every ton of chromium salts produced, about 2-3 tons of chromium-containing wastes will be generated. . [0003] Chromium (Cr) in chromium-containing solid waste is in two valence states (Cr 6+ and Cr 3+ ), a variety of phases exist. Of which hexavalent chromium Cr 6 + It is highly toxic to animals, plants and the human body, and its strong oxidizing properties can cause corrosion and damage to the body. It is a carc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08C04B20/02C04B18/04
CPCC04B18/0472C04B20/026C04B28/082C04B2201/50C04B22/002C04B24/2664C04B22/143C04B7/02C04B18/08C04B18/141C04B14/06C04B14/068C04B14/02C04B2103/0068C04B24/085C04B24/20Y02W30/91
Inventor 贺行洋郑正旗付健健苏英张芸宁杨进王迎斌胡军安秦景燕
Owner HUBEI UNIV OF TECH
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