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Stable curing continuous treatment process of heavy metal waste residues

A heavy metal stabilizer and treatment process technology, which is applied in the field of environmental protection, can solve the problems of not much research on stabilization/curing process, small processing capacity of treatment process, and non-continuous treatment, etc., to achieve major pollution control significance, good stabilization effect, The effect of increasing mobility

Active Publication Date: 2018-08-31
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Application Information

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Problems solved by technology

[0003] At present, the restoration of heavy metal waste slag or heavy metal-contaminated sites is mainly concentrated in the research of remediation agents, and there is not much research on the stabilization / solidification process. For most heavy metal waste slag treatment, the main method is to transport heavy metal waste slag to the treatment station for centralized treatment. treatment, the existing treatment process has a small amount of treatment, and cannot be processed continuously, and frequent transportation by car is likely to cause secondary pollution

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  • Stable curing continuous treatment process of heavy metal waste residues

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Effect test

Embodiment 1

[0044] The heavy metal waste slag produced by a smelter in the south has a gray-black appearance, mixed with some soil, stones, sand and other sundries, and the main metal pollution factors are Pb, Cd, Zn, Mn, among which the average content of Pb is 2210mg / kg, Cd The average content is 123mg / kg, the average Zn content is 2323mg / kg, and the average Mn content is 521mg / kg.

[0045]After the heavy metal waste slag is crushed, sieve through a 16mm sieve, take the undersieve, add calcium carbide slag and a solution containing sodium dihydrogen phosphate to a double-helix horizontal mixer according to a certain metering ratio, and stir evenly to obtain slurry A; the stirring time is 1min , the stirring speed is 150r / min,

[0046] The addition of the calcium carbide slag is added according to 5% of the quality of the heavy metal waste residue. In the solution containing sodium dihydrogen phosphate, the mass fraction of the sodium dihydrogen phosphate is 0.01%, and the addition of th...

Embodiment 2

[0055] The heavy metal waste slag produced by a copper mine tailings pond has a gray appearance and a particle size of less than 1mm. The main metal pollution factors are Pb, Cu, Zn, and Ni. The average content of Pb is 870mg / kg, and the average content of Cu is 1023mg / kg. The average content of Zn is 753mg / kg, and the average content of Ni is 821mg / kg.

[0056] Add the above-mentioned heavy metal waste slag, calcium carbide slag and sodium dihydrogen phosphate-containing solution into a double-helix horizontal mixer and stir evenly to obtain slurry A; the stirring time is 45s, and the stirring speed is 200r / min.

[0057] The addition amount of the calcium carbide slag is 4% of the weight of the heavy metal waste residue. In the solution containing sodium dihydrogen phosphate, the mass fraction of sodium dihydrogen phosphate is 0.02%, and the addition amount is 3% of the weight of the heavy metal waste residue.

[0058] After the slurry A is stirred, it is unloaded into the ac...

Embodiment 3

[0064] Adopt the same heavy metal waste slag of embodiment 1. After the heavy metal waste slag is crushed, sieve through a 16mm sieve, take the undersieve, add calcium carbide slag and a solution containing potassium dihydrogen phosphate to a double-helix horizontal mixer according to a certain metering ratio, and stir evenly to obtain slurry A; the stirring time is 1min , the stirring speed is 150r / min,

[0065] The addition of the calcium carbide slag is added according to 3% of the mass of the heavy metal waste residue. In the solution containing potassium dihydrogen phosphate, the mass fraction of potassium dihydrogen phosphate is 0.01%, and the addition of the heavy metal stabilizer is 2.5% of the mass of the heavy metal waste residue. %join in.

[0066] After the slurry A is stirred, it is discharged into the activated mixer, and the lignosulfonate early-strength water reducer and fly ash are added at the same time, and the slurry B is obtained by stirring evenly. The s...

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Abstract

A stable curing continuous treatment process of heavy metal waste residues comprises the following steps that the heavy metal waste residues, carbide slag and a heavy metal stabilizer are added into adouble-screw horizontal stirrer according to a certain metering proportion, discharging is carried out after even stirring is carried out, and the mixture enters an activating stirrer; meanwhile, a water reducing agent and a binding material are added into the activating stirrer, and the mixture is discharged into a piston type industrial pump after even stirring is carried out; finally, the product is conveyed to a specified area to be maintained and piled up. The process has the advantages of being large in treatment amount, capable of achieving continuous production, good in heavy metal waste residue stabilizing / curing effect and low in cost, and can be widely applied to the fields of the heavy metal waste residues, mining rehabilitation, waste and industrial waste incineration fly ashtreatment and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a stable and solidified continuous treatment process for heavy metal waste residue. Background technique [0002] Stablization / Solidification (S / S) technology is a relatively mature solid waste treatment technology widely used in European and American countries. After decades of research, it has been successfully applied to the treatment of heavy metal-containing waste residue, soil and sludge Environmental governance in the fields of sediment, chromium slag, mercury slag, arsenic slag, etc. Stabilization / solidification treatment technologies accounted for more than 50% of heavy metal-contaminated site remediation projects in the United States from 1982 to 2005. S / S in the usual sense generally includes the application of two technologies of heavy metal stabilization and solidification. Compared with other technologies, this technology has the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/02C04B28/08
CPCC04B28/021C04B28/04C04B28/08C04B2111/00775C04B18/144C04B22/16C04B24/18
Inventor 曹兴贺治国邝美娟蒋俊罗文连
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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