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Fly ash chelating agent capable of effectively inhibiting zinc leaching and preparation method thereof

A chelating agent and fly ash technology, applied in the field of fly ash chelating agent and its preparation, can solve the problems of insufficient chelating ability of heavy metals, easy re-leaching, secondary pollution and the like, and achieve strong chelating ability, good effect and high resistance to The effect of acid-base shock capacity

Inactive Publication Date: 2021-08-17
江苏乐尔环境科技股份有限公司
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Problems solved by technology

However, the chemical agents used in the current fly ash stabilization and solidification treatment have insufficient chelating ability to some heavy metals, especially Zn; Chelates are extremely unstable and easy to leach again, causing secondary pollution

Method used

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  • Fly ash chelating agent capable of effectively inhibiting zinc leaching and preparation method thereof
  • Fly ash chelating agent capable of effectively inhibiting zinc leaching and preparation method thereof
  • Fly ash chelating agent capable of effectively inhibiting zinc leaching and preparation method thereof

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] A fly ash chelating agent that can effectively inhibit zinc leaching, the fly ash chelating agent is made of the following components by weight: 40-45 parts of dimethyl dithiocarbamate sodium salt; 0.5-3 parts of sodium octyl sulfonate; 45-65 parts of water; 5-10 parts of 2-mercaptoethyl 3-mercaptopropionic acid sodium salt; the total number of parts of each component raw material is 100 parts.

[0022] The above components are added in sequence, stirre...

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Abstract

The invention relates to the technical field of chelating agent preparation, in particular to a fly ash chelating agent capable of effectively inhibiting zinc leaching, and the fly ash chelating agent is prepared from the following raw materials in parts by weight: 40-45 parts of sodium dimethyl dithiocarbamate; 0.5 to 3 parts of sodium di-sec-octyl maleate sulfonate salt; 45 to 65 parts of water; 5 to 10 parts of 2-mercaptoethyl 3-mercaptopropionic acid sodium salt; the total parts of the raw materials are 100 parts. The invention also provides a preparation method for preparing the fly ash chelating agent, which comprises the following steps: sequentially adding the raw materials into a stirring kettle according to the component proportion, stirring, and aging for 30 minutes after uniformly stirring to obtain the fly ash chelating agent. The fly ash chelating agent provided by the invention is high in chelating capacity, has relatively good stabilizing treatment capacity on Zn, and can effectively inhibit leaching of Zn; and the fly ash chelating agent has acid-base impact resistance and long-term stability, is very stable in a strongly acidic (pH < 4) or strongly alkaline (pH > 12) environment, and is not easy to leach again or cause secondary pollution.

Description

technical field [0001] The invention relates to the technical field of chelating agent preparation, in particular to a fly ash chelating agent capable of effectively inhibiting zinc leaching and a preparation method thereof. Background technique [0002] The incineration of garbage produces a large amount of fly ash containing heavy metals, which greatly exceeds the sanitary landfill standard and becomes hazardous waste, which is extremely harmful to humans and the environment. Therefore, it is necessary to stabilize the heavy metals in the fly ash so that it meets the landfill standard or can be used for subsequent resource utilization. [0003] Stabilization and solidification treatment technology refers to the use of different types of chelating agents to chemically react with harmful substances in fly ash, such as precipitation, adsorption, ion exchange and redox, to transform them into low-solubility, low-migration and Process for substances of low toxicity. Stabiliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/08A62D101/43
CPCA62D3/33A62D2101/08A62D2101/43
Inventor 宁少华
Owner 江苏乐尔环境科技股份有限公司
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