Stabilizing agent for repairing heavy metal chromium pollution, and preparation method and application thereof

The technology of stabilizer and heavy metal is applied in the field of stabilizer for repairing heavy metal chromium pollution and its preparation, which can solve the problems of low stabilization efficiency and short stabilization period, and achieves high stabilization efficiency, simple process and practicability. strong effect

Active Publication Date: 2020-06-02
HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technical solution describes two methods for treating contaminated areas such as chrome plating or acid cleanings that require specialized equipment. One involves adding an effective amount of certain substances called stable compounds (SC) into the area being treated. These SC's help prevent harmful metals from entering through their pores on surfaces while also promoting decomposition under specific conditions. Another approach includes mixing these SCRS together beforehand without any other ingredients like water. By doing this, the stability of the treatment becomes more durable over time compared to traditional techniques involving multiple steps.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding an effective method for treating contamination caused by various metallurgies such as chrome plating industry (chromiums), iron aluminum manufacturing processes, etc., while also addressing the issue of disposable sources like zinc sulfide containing large amounts of these metallics.

Method used

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  • Stabilizing agent for repairing heavy metal chromium pollution, and preparation method and application thereof
  • Stabilizing agent for repairing heavy metal chromium pollution, and preparation method and application thereof
  • Stabilizing agent for repairing heavy metal chromium pollution, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0044] A preparation method for a stabilizer for repairing heavy metal chromium pollution, comprising the following steps:

[0045] 1) Mix the following agents that have been fully dried according to the following mass ratio, calcium polysulfide: reduced iron powder: wheat bran = 3:1:1, and put them into a ball mill mixer to quickly mix evenly. Stored in a dry environment for later use, the reducing agent prepared at this stage is recorded as reducing agent 1.

[0046] The calcium polysulfide added during the preparation of the reducing agent needs to be dried in a blast drying oven at 45°C for 4 hours. The purity of the calcium polysulfide is industrially pure crystals with a purity greater than 50%. Wheat bran is a by-product of flake wheat flour. The added The moisture content of wheat bran must not exceed 2%; the particle size of the above-mentioned reduced iron powder is more than 400 mesh, and the iron content must be greater than 85%.

[0047] 2) Add 2.65% to 4.4% of b...

Embodiment 2

[0057] Preliminary experiment: Screening and ratio selection experiment of the effective components of the reducing agent in the reducing core:

[0058] 1. Stabilization efficiency experiment of single-component reducing agent on chromium-contaminated soil:

[0059] Table 1: Experimental results of stabilization efficiency of single-component reducing agent on chromium-contaminated soil

[0060]

[0061] The above table 1 shows that the soil stabilization experiments were carried out on the single components of the reducing inner core agent. The hexavalent chromium leaching concentration blank control value of the untreated soil was 28.2mg / L. After adding different dosages of the single agent, The concentration of leached hexavalent chromium in the soil has been reduced to a certain extent, and the use of calcium polysulfide component has the highest degree of stabilization of the soil, and the concentration of leached hexavalent chromium has been reduced to below the detec...

Embodiment 3

[0067] Verification experiment of biodegradable outer film:

[0068]The verification experiment of the degradable biological outer membrane is mainly demonstrated through the membrane biodegradation experiment, and the implementation process is as follows: in the membrane biodegradation experiment, the membrane liquid is cast on a horizontal glass plate, and the thickness of the membrane is kept within the range of 0.1-0.2mm. The film was cut into small square pieces of 2cm*2cm, and the weight of the film was weighed with a ten-thousand-digit balance and the serial number was recorded. Parallel experiments were performed on different concentrations of the film solution, and each sample was processed 3 times. In the experiment, the numbered square membranes were buried in the experimental soil at the same time and in order (Note: The membrane material needs to be soaked in water before being embedded in the soil, and the membrane material should be placed in deionized water at r...

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Abstract

The invention discloses a stabilizing agent for repairing heavy metal chromium pollution, and a preparation method and an application thereof. The stabilizing agent structurally comprises a reductioninner core and a degradable biological outer film coating outside the reduction inner core, the reduction inner core comprises calcium polysulfide, reduced iron powder and wheat bran, and the degradable biological outer film comprises modified polyvinyl alcohol. The preparation method of the stabilizing agent comprises the steps of preparing the inner core and covering with the degradable biological outer film to form the film. The stabilizing effect of the stabilizing particle on chromium-contaminated soil is good, and the stabilizing rate reaches up to 99% or above; the outer film covering the stabilizing agent has good biodegradability, so segmented and slow-release release of the agent can be achieved, the long-acting stability of the agent is improved to a large extent, and the stabilizing agent can be widely applied to soil heavy metal pollution remediation and contaminated site groundwater remediation engineering after being prepared on a large scale and has a certain promotionvalue.

Description

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Claims

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Application Information

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Owner HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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