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Method for stably solidifying zinc-containing phosphatized waste slag

A technology of phosphating waste residue and solidification method, which is applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., and can solve the problem of large landfill area, high treatment cost, systemicity, economy and practicability. Meet the requirements and other issues, to achieve the effect of reducing the volume increase ratio, short curing time, and good curing effect

Active Publication Date: 2015-09-02
扬州杰嘉工业固废处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second is the wet method, using acid leaching, alkali leaching, etc. to separate the zinc from the waste residue, and then further recover the zinc product or carry out harmless treatment; the wet method has the advantages of low energy consumption, less pollution, and high efficiency. However, the process is complicated and the processing cost is high
However, incineration also has some difficulties and shortcomings, such as how incineration and its system meet environmental protection requirements, avoid secondary pollution and consume a lot of energy
[0004] For the above-mentioned phosphating waste residue, it is difficult to meet the requirements if the commonly used lime or cement solidification disposal method is used. The main problem is that after the lime or cement solidification treatment, the volume increase is relatively large and takes up a large landfill area; Acidic medium corrosion ability is not good
The harmless treatment method is complicated to operate, including impurity removal, liquid-solid separation, and solid drying, which takes a long time and consumes a lot of energy
[0006] Chinese journal literature "Fan Hongqiang. Treatment and resource utilization of solid waste phosphating slag [M]. Master's thesis of Dalian University of Technology", "Li Yuexiang, Hua Guoxin, Wu Jingtan. Recycling of phosphating slag [J]. Chemical Industry Environmental Protection. 1994, (02)" etc. have carried out extensive theoretical research on how to effectively recycle phosphating slag, but the system, economy and practicability have not yet met the requirements

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  • Method for stably solidifying zinc-containing phosphatized waste slag
  • Method for stably solidifying zinc-containing phosphatized waste slag
  • Method for stably solidifying zinc-containing phosphatized waste slag

Examples

Experimental program
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Embodiment 1）

[0023] The zinc-containing phosphating waste slag treated in this example comes from the phosphating process workshop, with a moisture content of 35%. According to the "Corrosive Identification of Hazardous Waste Identification Standards" (GB 5085.1-2007), the pH value of the waste residue leachate is 3; according to the "Determination of Copper, Zinc, Lead, and Cadmium in Solid Wastes -1995) measured the leaching concentration of zinc to be 625mg / L.

[0024] The stable solidification method of the zinc-containing phosphating waste residue of the present embodiment comprises the following steps:

[0025] ① Weigh 100g of zinc-containing phosphating waste residue to be treated, add 1g of heavy metal trapping agent to it, and stir for 20 minutes. After stirring, a uniform slurry-like material is obtained. The mass ratio of the zinc-containing phosphating waste residue to the heavy metal trapping agent is 1:0.01.

[0026] The heavy metal trapping agent is a chelating agent, whic...

Embodiment 2）

[0038]The moisture content of the zinc-containing phosphating waste slag processed in this embodiment is 30%. According to the "Corrosive Identification of Hazardous Waste Identification Standards" (GB 5085.1-2007), the pH value of the waste residue leachate is 4; according to the "Determination of Copper, Zinc, Lead, and Cadmium in Solid Wastes -1995) measured the leaching concentration of zinc to be 716mg / L.

[0039] The stable solidification method of the zinc-containing phosphating waste slag of the present embodiment is the same as embodiment 1, except that:

[0040] In step ①, add 3 g of heavy metal trapping agent to 100 g of zinc-containing phosphating waste residue to be treated, and stir for 20 minutes. The mass ratio of the zinc-containing phosphating waste residue to be treated to the heavy metal trapping agent is 1:0.03.

[0041] In step ②, 7 g of sodium sulfide is added to the slurry material obtained in step ①, and the mass ratio of zinc-containing phosphating ...

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Abstract

The invention discloses a method for stably solidifying zinc-containing phosphatized waste slag. The method comprises the following steps: firstly, adding a heavy metal trapping agent into the to-be-treated zinc-containing phosphatized waste slag, and stirring uniformly so as to obtain a muddy material; adding sodium sulphide into the obtained muddy material under the stirring state, and further stirring for 20-30 minutes so as to obtain a micro black material after stirring; adding yellow sand or lime and concrete into the micro black material obtained after stirring, and stirring evenly so as to obtain a stirred material; cooling the obtained stirred material to normal temperature, transferring into a forming mold, taking out from the mold after forming, then maintaining for 2-3 days at normal temperature so as to obtain a solidified body, thus finishing stable solidification of the zinc-containing phosphatized waste slag. The method is simple to operate, is easy to realize, is short in maintenance time, and only needs 2-3 days for curing at normal temperature; compared with other methods, the method is higher in treatment efficiency.

Description

technical field [0001] The invention relates to a process for harmless treatment of solid hazardous waste, in particular to a method for stably solidifying zinc-containing phosphating waste residue. Background technique [0002] Phosphating is a surface chemical treatment method. The metal surface is contacted with an acidic solution containing dihydrogen phosphate, and a stable, insoluble inorganic compound film is formed through chemical and electrochemical reactions. This film is called phosphorus. film. Through the phosphating pretreatment of the metal surface, the metal surface is easy to paint, spray, wax and anti-rust oil, and can improve the corrosion resistance of the metal surface, effectively inhibiting the corrosion under the coating. The phosphating process using zinc-based phosphating solution will produce zinc-containing phosphating waste residue. The pH of the leaching solution of this waste residue is 3-4, and the leaching concentration of zinc is 535 mg / L-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00A62D3/33A62D101/43
CPCA62D3/33B09B5/00A62D2101/43B09B3/20
Inventor 尚通明周书利樊红杰岳喜龙刘维桥仲鹏鹏
Owner 扬州杰嘉工业固废处置有限公司