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Method for recovering cadmium from cadmium extraction plant harvest

A technology for harvesting and planting, applied in the field of heavy metal recycling and processing, can solve problems such as inability to extract cadmium

Inactive Publication Date: 2018-09-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the existing technologies can extract cadmium to realize resource utilization of cadmium

Method used

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  • Method for recovering cadmium from cadmium extraction plant harvest

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) After cleaning 100g green scallops with water, dry them in an oven at 70°C for 24 hours to constant weight to obtain green scallops with a moisture content of 22.9wt%, crush them with a crusher, and pass through a 100-mesh sieve to obtain 22.5g green scallops. Chickweed harvest; adopting inductively coupled plasma atomic emission spectrometry (ICP-AES) to measure the cadmium content in the Chickpea harvest is 269.3mg / kg;

[0063] (2) Put the harvest of the green squid into a porcelain boat, place it in the heating area of ​​a tubular electric furnace, feed nitrogen gas into the furnace at a flow rate of 3L / min, and after continuing to feed nitrogen gas for 5min, heat up to 350°C and keep it warm for 60min, Carry out thermal decomposition; After thermal decomposition is finished, stop heating, naturally cool down to room temperature, obtain 9.0g pyrolysis ash; Adopt inductively coupled plasma-atomic emission spectrometry (ICP-AES) to record the cadmium content in the ...

Embodiment 2

[0072] (1) After cleaning 100g green scallops with water, dry them in an oven at 70°C for 24 hours to constant weight to obtain green scallops with a moisture content of 22.9wt%, crush them with a crusher, and pass through a 100-mesh sieve to obtain 22.5g green scallops. Harvests of Chinese quinces; adopting inductively coupled plasma-atomic emission spectrometry (ICP-AES) to measure the content of cadmium in the harvests of Chinese quinces is 269.3mg / kg

[0073] (2) Put the harvest of the green squid into a porcelain boat, place it in the heating area of ​​a tubular electric furnace, feed nitrogen gas into the furnace at a flow rate of 5L / min, and after continuing to feed nitrogen gas for 5min, heat up to 350°C and keep it warm for 45min, Carry out thermal decomposition; After thermal decomposition is finished, stop heating, naturally cool down to room temperature, obtain 9.0g pyrolysis ash; Adopt inductively coupled plasma-atomic emission spectrometry (ICP-AES) to record the ...

Embodiment 3

[0081] (1) After cleaning 100g green scallops with water, dry them in an oven at 70°C for 24 hours to constant weight to obtain green scallops with a moisture content of 22.9wt%, crush them with a crusher, and pass through a 100-mesh sieve to obtain 22.5g green scallops. Chickweed harvest; adopting inductively coupled plasma atomic emission spectrometry (ICP-AES) to measure the cadmium content in the Chickpea harvest is 269.3mg / kg;

[0082] (2) Put the harvest of the green squid into a porcelain boat, place it in the heating area of ​​a tubular electric furnace, feed nitrogen gas into the furnace at a flow rate of 5L / min, and after continuing to feed nitrogen gas for 5min, heat up to 350°C and keep it warm for 45min, Carry out thermal decomposition; After thermal decomposition is finished, stop heating, naturally cool down to room temperature, obtain 9.0g pyrolysis ash; Adopt inductively coupled plasma-atomic emission spectrometry (ICP-AES) to record the cadmium content in the ...

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Abstract

The invention provides a method for recovering cadmium from cadmium extraction plant harvest. The method comprises the following steps: performing thermolysis on the cadmium extraction plant harvest to obtain thermolysis ash; mixing the thermolysis ash with water to obtain a thermolysis ash slurry; performing acid leaching on the thermolysis ash slurry, and filtering the obtained slurry to obtainan acid leaching solution; and mixing the acid leaching solution with zinc, and performing a displacement reaction to obtain cadmium. An experiment result shows that the cadmium recovery method allowsthe purity of the obtained cadmium to reach 77.2-88.1% and the cadmium recovery rate to reach 85%, realizes recycling of the cadmium, and quantitatively reduces the cadmium extraction plant harvest.

Description

technical field [0001] The invention relates to the technical field of recovery and treatment of heavy metals, in particular to a method for recovering cadmium from cadmium-extracted plant harvests. Background technique [0002] Phytoremediation is an emerging environmental treatment technology. It is based on the theory of plant tolerance and over-enrichment of certain or certain chemical elements, and uses plants to remove polluting heavy metals in soil. Compared with traditional physical and chemical engineering techniques, phytoremediation has the following characteristics: first, it has a wide range of applications, and can be used to remove heavy metal pollutants in the soil, and can also be used to remove pollutants in the atmosphere and water around polluted soil; Implementing in-situ restoration, it removes pollutants without destroying the soil ecological environment, maintaining soil structure and microbial activity, can increase soil organic matter content, impro...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/08C22B3/46C22B17/00
CPCC22B3/08C22B3/46C22B7/007C22B17/04Y02P10/20
Inventor 刘杰庄重张杏峰
Owner GUILIN UNIVERSITY OF TECHNOLOGY