CN105621481A - Method for recovering arsenic from ecological remediation plant ciliate desert-grass - Google Patents
Method for recovering arsenic from ecological remediation plant ciliate desert-grass Download PDFInfo
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- CN105621481A CN105621481A CN201410597893.2A CN201410597893A CN105621481A CN 105621481 A CN105621481 A CN 105621481A CN 201410597893 A CN201410597893 A CN 201410597893A CN 105621481 A CN105621481 A CN 105621481A
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- herba pteridis
- pteridis vittatae
- arsenic
- grass
- ciliate desert
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Abstract
The invention discloses a method for recovering arsenic from ecological remediation plant ciliate desert-grass and belongs to the field of ecological remediation plant treatment. The method solves the problem that arsenic in the ecological remediation plant ciliate desert-grass cannot be recovered. The method comprises carrying out high temperature pyrolysis on arsenic-containing ciliate desert-grass through a tubular furnace, adding CaO into the ciliate desert-grass to solidify arsenic, carrying out alkali extraction on the ciliate desert-grass bottom ash after pyrolysis and carrying out precipitation through a CuSO4. 5H2O as a precipitation agent to obtain copper arsenate. The method has simple processes, can be operated easily and has a high arsenic recovery rate. The copper arsenate can be used as a chemical product in the field of timber corrosion resistance.
Description
Technical field
The invention belongs to the process field of restoration of the ecosystem plant.
Background technology
Herba pteridis vittatae is the typical restoration of the ecosystem plant of As polluted soil, and corresponding plants recovery technique has been successfully applied to the removal of Arsenic in Soil. After Herba pteridis vittatae repairs contaminated soil, internal arsenic content can reach the 2.34% of plant dry weight. Along with deepening continuously of Herba pteridis vittatae rehabilitating soil research, the Herba pteridis vittatae yield containing arsenic strengthens year by year, places easily caused by environmental pollution for a long time.
Summary of the invention
It is an object of the invention to provide a kind of method arsenic in Herba pteridis vittatae can recycled.
The present invention is achieved by the following technical programs: arsenic recovery method in a kind of restoration of the ecosystem plant Herba pteridis vittatae, is cleaned by period of maturation Herba pteridis vittatae, dries, crushes, obtains Herba pteridis vittatae powder; Herba pteridis vittatae powder is mixed homogeneously with CaO, adds polyvinyl alcohol water solution pelletize, put it into and tube furnace carries out pyrolysis, after cooling, obtain Herba pteridis vittatae bottom ash; Taking Herba pteridis vittatae bottom ash, adding people's Na0H mass concentration is 10g/L, Na2C03Mass concentration is the mixed solution leaching of 30g/L, and stirring, filtration, by the half of filtrate evaporation and concentration to original volume, being acidified to pH with dilute sulfuric acid is 1, adds CuS04��5H20, maintain the temperature at 70 DEG C, be added dropwise over ammonia to producing green precipitate, then filter, wash, dry, obtain copper arsenate precipitation.
Described CaO addition is 8%, and described pyrolysis temperature is 400��600 DEG C, pyrolysis time is 30min, controls air
Flow is 0.12L/min.
Described Herba pteridis vittatae bottom ash adds in mixed solution leaching step, and leaching temperature is 70 DEG C, leaching time is 2h, solid-to-liquid ratio is 1:10.
Adding ammonia to pH value of solution after precipitation is 5.
There is advantages that
Arsenic in Herba pteridis vittatae can being recycled, the response rate is high, and processing procedure is simple, and the copper arsenate of recovery can use as industrial chemicals.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention will be further described.
Specific embodiment: cleaned by period of maturation Herba pteridis vittatae, in 70 DEG C of drying, puts people's ball mill and crushes, obtain Herba pteridis vittatae powder; Being mixed homogeneously with CaO by Herba pteridis vittatae powder, CaO addition is 8%, adds polyvinyl alcohol water solution pelletize; Putting it in tube furnace, O.12L/min control air mass flow is, tube furnace passes through temperature programming, and pyrolysis temperature is 400��600 DEG C, and pyrolysis time is 30min, obtains Herba pteridis vittatae bottom ash after cooling; By Herba pteridis vittatae bottom ash, adding people's Na0H mass concentration is 10g/L, Na2C03Mass concentration is the mixed solution leaching of 30g/L, and leaching temperature is 70 DEG C, leaching time is 2h, solid-to-liquid ratio is 1:10, stirring, filters; By the half of filtrate evaporation and concentration to original volume, being acidified to pH with dilute sulfuric acid is 1, adds CuS04��5H20, maintain the temperature at 70 DEG C, be added dropwise over ammonia to producing green precipitate, making final solution pH is 5, then filters, washing, dry obtains copper arsenate.
Pyrolysis temperature be 600 DEG C, pyrolysis time be 30min, CaO addition be 8% time, bottom ash arsenic loss rate is 5.6%, and Herba pteridis vittatae bottom ash arsenic content is about 7lmg/g; At m (NaoH): m (Na2CO3) for 1:3, alkali leaching temperature be 70 DEG C, the alkali leaching time be 2h, solid-to-liquid ratio be 1:10 when, arsenic extraction rate is up to 95.83%; Precipitation pH be 5, precipitation reaction temperature be 70 DEG C time, arsenic rate of deposition is up to 95.9%.
Being analyzed product drawing cupric 35%, arsenic 32%, purity is 93%.
Recovery method described in the embodiment of the present invention processes the recyclable arsenic 12g of the dry Herba pteridis vittatae of 1kg, the arsenic response rate reaches 88%, the problem fundamentally solving Herba pteridis vittatae cutting safe disposal, the copper arsenate of preparation can use as industrial chemicals, and the resource being successfully realized Herba pteridis vittatae cutting is recycled.
Above content is the further description present invention done in conjunction with specific embodiment, it is impossible to assert that specific embodiment of the invention is confined to these explanations. For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, protection scope of the present invention all should be considered as belonging to.
Claims (4)
1. arsenic recovery method in a restoration of the ecosystem plant Herba pteridis vittatae, it is characterised in that: period of maturation Herba pteridis vittatae is cleaned, dries, crush, obtain Herba pteridis vittatae powder; Herba pteridis vittatae powder is mixed homogeneously with CaO, adds polyvinyl alcohol water solution pelletize, put it into and tube furnace carries out pyrolysis, after cooling, obtain Herba pteridis vittatae bottom ash; Taking Herba pteridis vittatae bottom ash, adding people's Na0H mass concentration is 10g/L, Na2C03Mass concentration is the mixed solution leaching of 30g/L, and stirring, filtration, by the half of filtrate evaporation and concentration to original volume, being acidified to pH with dilute sulfuric acid is 1, adds CuS04��5H20, maintain the temperature at 70 DEG C, be added dropwise over ammonia to producing green precipitate, then filter, wash, dry, obtain copper arsenate precipitation.
2. recovery method as claimed in claim 1, it is characterised in that: described CaO addition is 8%, and described pyrolysis temperature is 400��600 DEG C, pyrolysis time is 30min, and control air mass flow is 0.12L/min.
3. recovery method as claimed in claim 1 or 2, it is characterised in that: described Herba pteridis vittatae bottom ash adds in mixed solution leaching step, and leaching temperature is 70 DEG C, leaching time is 2h, solid-to-liquid ratio is 1:10.
4. recovery method as claimed in claim 3, it is characterised in that: adding ammonia to pH value of solution after precipitation is 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410597893.2A CN105621481A (en) | 2014-10-31 | 2014-10-31 | Method for recovering arsenic from ecological remediation plant ciliate desert-grass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410597893.2A CN105621481A (en) | 2014-10-31 | 2014-10-31 | Method for recovering arsenic from ecological remediation plant ciliate desert-grass |
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| CN105621481A true CN105621481A (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410597893.2A Pending CN105621481A (en) | 2014-10-31 | 2014-10-31 | Method for recovering arsenic from ecological remediation plant ciliate desert-grass |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217147A (en) * | 2017-05-23 | 2017-09-29 | 覃淑兰 | A kind of method for removing and adsorbing ciliate desert-grass heavy metal |
| CN110921692A (en) * | 2019-12-09 | 2020-03-27 | 云南大学 | Method for preparing Al2O3 by using biological template for fixing arsenic in plants |
-
2014
- 2014-10-31 CN CN201410597893.2A patent/CN105621481A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217147A (en) * | 2017-05-23 | 2017-09-29 | 覃淑兰 | A kind of method for removing and adsorbing ciliate desert-grass heavy metal |
| CN110921692A (en) * | 2019-12-09 | 2020-03-27 | 云南大学 | Method for preparing Al2O3 by using biological template for fixing arsenic in plants |
| CN110921692B (en) * | 2019-12-09 | 2020-10-27 | 云南大学 | Biological template preparation Al for fixing arsenic in plants2O3Method of producing a composite material |
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Application publication date: 20160601 |
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| WD01 | Invention patent application deemed withdrawn after publication |