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Processing method for utilizing heavy metal to restore plant residues

A technology for restoring plants and a treatment method is applied in the fields of comprehensive recycling and utilization of secondary resources and environmental protection, and can solve problems such as increasing the potential danger of heavy metal pollution of groundwater, instability of compost products, and difficulty in absorption and enrichment by plants, achieving The effect of reducing the possibility of secondary pollution, reducing the risk of air pollution, and easy industrial application

Inactive Publication Date: 2012-06-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also shortcomings in the fermentation bin system: ① high investment, including investment in composting equipment (design, manufacturing, etc.), operating costs and maintenance costs; ② due to the relatively short composting cycle, compost products will be potentially unstable , a period of composting is not enough to obtain a stable, odor-free product, and the post-maturation period of composting is relatively prolonged
Disadvantages are: high investment cost; some sulfur and nitrogen compounds produce corresponding oxides, and the exhaust pollutes the air
In the process of incineration, good smoke and dust control should be carried out to prevent air pollution; in addition, some heavy metals with high recovery value, such as Au and Ag, have low bioavailability and are not easy to be absorbed and enriched by plants, which requires Using induction technology to improve the metal accumulation ability of plants, and the application of chelating agents will increase the potential risk of heavy metal pollution to groundwater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: The processing method of the heavy metal restoration plant residue, the specific operation is as follows:

[0046] The arsenic-fixing ash treatment is carried out with the arsenic super-accumulating plant Centipede grass as raw material. The raw material comes from a tailing pond in Gejiu for soil pollution remediation. The average arsenic content of Centipede grass is 6700mg / kg (dry weight). After the grass is washed and drained, it is crushed into debris with a particle size of 2-8mm, placed in a porcelain crucible, and the plant and the fixative superphosphate are mixed in a mass ratio of 3:1, and then placed in a muffle furnace at 400 ° C After ashing for 4 hours, add a spray device on the top of the muffle furnace, and use Ca(OH) with a mass percentage concentration of 10% for the gas generated during ashing 2 The solution is sprayed, and the ash produced after ashing is mixed into the arsenic ore for beneficiation, smelting and recovery of arsenic ...

Embodiment 2

[0048] Example 2:The processing method of the heavy metal restoration plant residue, the specific operation is as follows:

[0049] The arsenic-fixing ash treatment is carried out with the arsenic super-accumulating plant Centipede grass as raw material. The raw material comes from a tailing pond in Gejiu for soil pollution remediation. The average arsenic content of Centipede grass is 6700mg / kg (dry weight). After the grass is cleaned and drained, it is crushed into debris with a particle size of 2-8 mm, placed in a porcelain crucible, and the plant and the fixative calcium hydroxide are mixed in a mass ratio of 4:1, and then placed in a muffle furnace at 500 ° C After ashing for 5 hours, add a spray device on the top of the muffle furnace, and use Ca(OH) with a mass percentage concentration of 10% for the gas generated during ashing 2 Solution spraying, the ash produced after ashing utilizes HNO with a mass percentage concentration of 10% 3 The solution is dissolved for t...

Embodiment 3

[0051] Example 3: The processing method of the heavy metal restoration plant residue, the specific operation is as follows:

[0052] The lead super-accumulating plant P. pinata from a polluted soil phytoremediation mining area was used as raw material for lead-fixing ashing treatment. After washing and draining 200kg of P. pinnata, it was crushed to a size between 2-8mm, and the plant and fixed Agent Na 2 S 2 o 3 Mix at a mass ratio of 2:1, then ash in a muffle furnace at 600°C for 6 hours, add a spray device on the top of the muffle furnace, and use a NaOH solution with a mass percentage of 15% for the ashing gas Spraying, the ashes produced after ashing are mixed into the lead ore for beneficiation, smelting and recovery of lead metal. The loss of plant mass by ashing treatment accounted for about 85% of the total mass, and the reduction effect was obvious. Compared with no fixative, lead volatilization was reduced by 90%.

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Abstract

The invention discloses a processing method for utilizing heavy metal to restore plant residues, which comprises cleaning and draining the plant residues after restoration, enabling granularity of debris to be between 2mm and 8mm after smashing, mixing plant debris and a fixing agent according to a proportion of mass ratio of 2-5:1, ashing for 4-6h under the condition of 400-800 DEG C, spraying gas generated by ashing, and mixing ash generated after ashing into corresponding metal ores to perform further smelting and recycling or use acid spray to purify heavy metal by-products. The processing method is large in processing quantity and remarkable in reduction, plant quality loss accounts for 85-98% of the total mass, and volatilization quantity of the heavy metal is reduced by 80-90%. The processing method is low in cost, reduces secondary pollution to the environment, and has good practical application prospects in the aspect of metal recycling.

Description

technical field [0001] The present invention relates to a treatment method for reducing the volatilization of heavy metals in restoration of plant ashing, in particular to a subsequent treatment and disposal method for super-accumulated plants used for remediation of heavy metal-contaminated soil and a method for reducing volatilization of heavy metals and increasing the recovery of heavy metal elements. Comprehensive recycling of secondary resources and environmental protection. Background technique [0002] The study of hyperaccumulator plants has very important theoretical significance and practical value. Such plants can not only be used to restore heavy metal-contaminated soil, reclaim mines and recover rare and rare earth elements in chemical discharges and metals in waste ore piles, but also maintain water and soil and beautify the environment. In addition, such plants can also be used to find blind mines and archaeology. [0003] There are many methods currently us...

Claims

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Application Information

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IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 王海娟宁平王宏镔张泽彪彭金辉曾向东姜永利解兴春
Owner KUNMING UNIV OF SCI & TECH
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