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Chromium Contaminated Soil Remediation Materials

A technology for chromium-contaminated soil and remediation materials, which is applied in the restoration of contaminated soil and other directions, can solve problems such as intractability, and achieve the effects of convenient production, less dosage, and stable remediation effect.

Active Publication Date: 2021-07-23
江苏精炜新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, because the mixed chromium slag contains a large amount of hexavalent chromium in the lattice state, it is difficult to deal with conventional reducing agents and common process conditions, which has become a difficult problem in the current chromium-contaminated site restoration and treatment projects

Method used

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  • Chromium Contaminated Soil Remediation Materials
  • Chromium Contaminated Soil Remediation Materials
  • Chromium Contaminated Soil Remediation Materials

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] This specific embodiment adopts the following technical scheme: the chromium-contaminated soil remediation material is composed of the following parts by mass: CaSO 4 15%, CaS 4 21%, FeSO 4 21%, Ca(OH) 2 20%, AL(OH) 3 23%;

[0021] The preparation steps of the restoration material are as follows:

[0022] (1) Adjust the temperature of the reaction device to 110°C, and the CaSO 4 Added to the reaction device from the first feed port, CaSO 4 is 15%, then add AL(OH) to the reaction device from the second feed port 3 , Ca(OH) 2 , AL(OH) 3 23%, Ca(OH) 2 Mix and stir the three materials through the stirring shaft of the reaction device to fully react the three materials, keep the reaction temperature at 110°C, and the reaction time at 3H, CaSO 4 and AL(OH) 3 , Ca(OH) 2 The reaction produces layered double metal hydroxides;

[0023] (2) Add 21% CaS to the reaction device sequentially from the top feeding port 4 and 21% FeSO 4 , stir through the stirring shaft to...

specific Embodiment approach 2

[0026] This specific embodiment adopts the following technical scheme: the chromium-contaminated soil remediation material is composed of the following parts by mass: CaSO 4 17%, CaS 4 22%, FeSO 4 22%; Ca(OH) 2 21%, AL(OH) 3 24%;

[0027] The preparation steps of the restoration material are as follows:

[0028] (1) Adjust the temperature of the reaction device to 110°C, and the CaSO 4 Added to the reaction device from the first feed port, CaSO 4 17%, then add AL(OH) from the second feed port to the reaction device 3 , Ca(OH) 2 , AL(OH) 3 24%, Ca(OH) 2 The three materials are mixed and stirred through the stirring shaft of the reaction device to fully react the three materials, and the reaction temperature is kept at 110°C, and the reaction time is 3.5H. CaSO 4 and AL(OH) 3 , Ca(OH) 2 The reaction produces layered double metal hydroxides;

[0029] (2) Add 22% CaS to the reaction device sequentially from the top feeding port 4 and 22% FeSO 4 , stir through the st...

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Abstract

The invention discloses a chromium-contaminated soil remediation material, which relates to the technical field of chromium-contaminated soil remediation. Chromium-contaminated soil remediation material consists of the following mass parts: CaSO 4 15‑18%, Ca(OH) 2 20‑23%, CaS 4 21‑23%, FeSO 4 21‑23%, AL(OH) 3 23‑25%; the preparation steps of the restoration material are as follows: mix 15‑18% CaSO 4 , 23-25% AL(OH) 3 , 20‑23% Ca(OH) 2 Add into the reaction device, mix and stir the three materials to make the three fully react, keep the reaction temperature at 90-110°C, and the reaction time at 3-3.5H; add 23-25% CaS into the reaction device 4 and 25‑27% FeSO 4 Stir to make it fully mixed, and keep warm for 1-1.5H; put the mixed material in the reaction device into a flash dryer and dry it to obtain a powdery soil repair material. The invention has the advantages of less dosage, fast reaction rate, stable repairing effect, good repairing effect and convenient manufacture.

Description

technical field [0001] The invention relates to the technical field of remediation of chromium-contaminated soil, in particular to a remediation material for chromium-contaminated soil. Background technique [0002] Chromium slag (solid waste containing chromium) has become an important environmental problem of chromium pollution. The chromium that enters the soil due to weathering is easily oxidized into soluble compound anions, and then transferred to surface water or groundwater by leaching. When there is too much chromium in the soil, it will inhibit the nitrification of organic matter and cause chromium to accumulate in plants. Contaminated soil in chromium slag sites can usually be divided into three categories: heavily polluted surface layer of slag-soil mixture (with a small amount of chromium slag mixed in it), heavily polluted soil layer without chromium slag, and lightly polluted soil layer. At present, chemical reducing agents are mainly used for remediation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 张剑宇郑南峰吴春江佘卫民
Owner 江苏精炜新材料有限公司
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