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Cadmium-lead-arsenic polluted soil composite eluting agent and preparation method thereof

A compound leaching agent and arsenic-polluted technology, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of low removal efficiency of various heavy metal-contaminated soils, achieve efficient leaching, avoid The effect of secondary pollution and simple preparation method

Pending Publication Date: 2021-12-03
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching agent is the core of the leaching technology, but the existing leaching agents often have low removal efficiency for various heavy metal-contaminated soils. Therefore, it is necessary to develop a low-cost, high-efficiency, less secondary pollution and can remove various heavy metals at the same time. necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of cadmium lead arsenic polluted soil composite leaching agent, described composite leaching agent comprises hydroxyethylidene diphosphonic acid solution, L-lactic acid solution, pyruvic acid solution and FeCl 3 solution;

[0021] The hydroxyethylidene diphosphonic acid, L-lactic acid, pyruvic acid and FeCl 3 The volume ratio of the solution is: 6:2:1:1;

[0022] The concentration of the hydroxyethylidene diphosphonic acid solution is 10%; the concentration of the L-lactic acid solution is 10%; the concentration of the pyruvic acid solution is 10%; the FeCl 3 The concentration of the solution is 0.1mol / L.

[0023] A kind of preparation method of cadmium lead arsenic polluted soil compound eluent, described preparation method is:

[0024] (1) Mix 10% hydroxyethylidene diphosphonic acid solution, 10% L-lactic acid solution, 10% pyruvic acid solution and 0.1mol / L FeCl3 solution in a volume ratio of 6:2:1:1 , to obtain a mixed solution A;

[0025] (2) Put the mi...

Embodiment 2

[0027] A kind of cadmium lead arsenic polluted soil composite leaching agent, described composite leaching agent comprises hydroxyethylidene diphosphonic acid solution, L-lactic acid solution, pyruvic acid solution and FeCl 3 solution;

[0028] The hydroxyethylidene diphosphonic acid, L-lactic acid, pyruvic acid and FeCl 3 The volume ratio of the solution is: 6:2:1:1;

[0029] The composite eluent also includes a pH regulator;

[0030] The pH regulator is 0.1mol / L HCl or NaOH solution;

[0031] The concentration of the hydroxyethylidene diphosphonic acid solution is 10%; the concentration of the L-lactic acid solution is 10%; the concentration of the pyruvic acid solution is 10%; the FeCl 3 The concentration of the solution is 0.1mol / L.

[0032] A kind of preparation method of cadmium lead arsenic polluted soil compound eluent, described preparation method is:

[0033] (1) Mix 10% hydroxyethylidene diphosphonic acid solution, 10% L-lactic acid solution, 10% pyruvic acid s...

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PUM

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Abstract

The invention relates to a cadmium-lead-arsenic polluted soil composite eluting agent and a preparation method thereof. The cadmium-lead-arsenic polluted soil composite eluting agent comprises a hydroxyethylidene-1, 1-diphosphonic acid solution, an L-lactic acid solution, a pyruvic acid solution and a FeCl3 solution. The volume ratio of the hydroxyethylidene-1, 1-diphosphonic acid to the L-lactic acid to the pyruvic acid to the FeCl3 solution is 6: 2: 1: 1. The preparation method of the cadmium-lead-arsenic polluted soil composite eluting agent comprises the following steps: (1) mixing 10% of a 1-hydroxyethylidene-1, 1-diphosphonic acid solution, 10% of an L-lactic acid solution, 10% of a pyruvic acid solution and a 0.1 mol / L FeCl3 solution according to a volume ratio of 6: 2: 1: 1 to obtain a mixed solution A; and (2) placing the mixed solution A in a reciprocating oscillator for oscillation treatment, sealing, and storing in a dark place. According to the invention, thehydroxyethylidene-1, 1-diphosphonic acid solution, the L-lactic acid solution, the pyruvic acid solution and the FeCl3 solution are compounded, so that not only can the efficient leaching of the soil polluted by the high cadmium, lead and arsenic be realized, but also the problem of secondary pollution to the soil can be avoided.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and in particular relates to a compound leaching agent for cadmium, lead and arsenic polluted soil and a preparation method thereof. Background technique [0002] Cadmium, lead and arsenic are common heavy metal pollutants. When cadmium, lead and arsenic and their various forms of heavy metals enter the human body, they will cause harm to human health. Cadmium enters the human body and easily accumulates in the kidneys, causing harm to the kidneys. In addition, it is easy to cause osteoporosis and softening; lead will cause serious damage to the blood system and nervous system of the human body, and will seriously affect the growth and intellectual development of infants. ; Arsenic entering the human body will cause serious harm to the skin, respiratory system, blood system, etc., and will seriously affect human physiological functions, leading to miscarriage, inf...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/02B09C1/08
CPCC09K17/40B09C1/02B09C1/08
Inventor 魏树和徐雷代惠萍安婧
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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