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Heavy metal repairing agent as well as preparation method and application thereof

A restoration agent and heavy metal technology, applied in the field of environmental restoration, can solve problems such as the restoration effect of various heavy metal pollutants that have not been mentioned, and achieve the effect of improving restoration effect, reducing preparation cost, and reducing site restoration cost

Active Publication Date: 2022-04-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention can be used in the fields of chromium-containing sewage treatment, chromium-contaminated groundwater restoration, etc., it also does not mention the restoration effect on the compounding of various heavy metal pollutants

Method used

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  • Heavy metal repairing agent as well as preparation method and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a heavy metal restoration agent and a preparation method thereof. The raw material used in the preparation method is the magnetic separation tailings produced by a gold smelter, calculated as oxides, wherein the mass fractions of iron, copper, and zinc are respectively : 49.67%, 0.25%, 1.61%, the preparation method comprises the following steps:

[0065] (1) Perform pretreatment, reduction treatment, pickling treatment and suction filtration on the magnetic separation tailings in sequence to obtain iron-based polymetallic; the pretreatment specifically includes: grinding the material and passing it through a 60-mesh sieve; Calcined and oxidized in a muffle furnace for 4 hours; the reduction treatment is as follows: placing the material in a tube furnace and feeding H at 900°C 2 Reaction for 6 hours; the pickling treatment specifically includes: placing the material in a hydrochloric acid solution with a concentration of 5 wt%, and pickling for 1...

Embodiment 2

[0069] This embodiment provides a heavy metal restoration agent and a preparation method thereof. The raw material used in the preparation method is cyanide tailings produced by a gold wet smelter. Calculated as oxides, the mass fractions of iron, copper, and zinc Respectively: 43.14%, 0.28%, 0.22%. The preparation method comprises the following steps:

[0070] (1) Carry out pretreatment, reduction treatment, pickling treatment and suction filtration sequentially on the cyanide tailings to obtain iron-based polymetallic; the pretreatment is specifically: after the material is ground and sieved through 150 mesh, it is sieved at 1000 ° C Calcined and oxidized in a muffle furnace for 4 hours; the reduction treatment specifically includes: placing the material in a tube furnace, and passing H at 800°C 2 Reaction for 8 hours; the pickling treatment specifically includes: placing the material in a hydrochloric acid solution with a concentration of 2 wt%, and pickling for 2 hours;

...

Embodiment 3

[0074] This embodiment provides a heavy metal restoration agent and a preparation method thereof. The raw material used in the preparation method is the magnetic separation tailings produced by a gold smelter, calculated as oxides, wherein the mass fractions of iron, copper, and zinc are respectively : 49.67%, 0.25%, 1.61%, the preparation method comprises the following steps:

[0075] (1) Carry out pretreatment, reduction treatment, pickling treatment and suction filtration on the tailings of magnetic separation in sequence to obtain iron-based polymetallic; the specific pretreatment is: after the material is ground and sieved through 50 mesh, it is heated at 1000 ° C Calcined and oxidized in a muffle furnace for 4 hours; the reduction treatment is as follows: placing the material in a tube furnace and feeding H at 1000°C 2 Reaction for 4 hours; the pickling treatment specifically includes: placing the material in a sulfuric acid solution with a concentration of 10 wt%, and p...

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Abstract

The invention provides a heavy metal repairing agent and a preparation method and application thereof, the heavy metal repairing agent is iron-based sulfurized polymetallic, and comprises a zero-valent iron core and ferrous sulfide and polymetallic particles covering the surface of the zero-valent iron core; the multi-metal particles comprise at least two types of metal elements other than iron. The preparation method comprises the following steps that (1) iron-containing waste residues are sequentially subjected to pretreatment, reduction treatment and acid pickling treatment, and iron-based multi-metal is obtained; (2) preparing a buffer solution, removing dissolved oxygen in the solution, and sealing a solution system; and (3) alkali metal sulfide salt, the iron-based multi-metal obtained in the step (1) and the buffer solution obtained in the step (2) are mixed, solid-liquid separation is conducted after vulcanization reaction, and the iron-based multi-metal sulfide, namely the heavy metal repairing agent, is obtained. According to the heavy metal remediation agent provided by the invention, efficient removal of various heavy metal pollutants is realized, meanwhile, the preparation cost is reduced, and the application prospect of the heavy metal remediation agent in the field of water and soil remediation is widened.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration and relates to a heavy metal restoration agent, in particular to a heavy metal restoration agent and its preparation method and application. Background technique [0002] Heavy metals are a class of important pollutants that can have a profound impact on ecosystems. From ore mining to product production to commodity use, heavy metals are required in many aspects of human production and life. Therefore, heavy metals can be released and diffused into the environment through various channels, resulting in unpredictable environmental risks. Heavy metal pollution has the characteristics of concealment, long-term, non-degradable and irreversible, which not only leads to the reduction of soil fertility and crop yield and quality, but also easily leads to groundwater pollution, and accumulates in plants, animals and human bodies through the food chain. Serious harm to human health and t...

Claims

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Application Information

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IPC IPC(8): C09K17/04B09C1/08C02F1/461C02F101/20
Inventor 周鹏王源张红玲高增礼何谦裴丽丽徐红彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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