CN104889148A - Static passivation and adsorption repair method for heavy metal contaminated soil/tailing sand of tailing sand reservoir - Google Patents
Static passivation and adsorption repair method for heavy metal contaminated soil/tailing sand of tailing sand reservoir Download PDFInfo
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- CN104889148A CN104889148A CN201510262028.7A CN201510262028A CN104889148A CN 104889148 A CN104889148 A CN 104889148A CN 201510262028 A CN201510262028 A CN 201510262028A CN 104889148 A CN104889148 A CN 104889148A
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Abstract
The invention discloses a static passivation and adsorption repair method for heavy metal contaminated soil/tailing sand of a tailing sand reservoir. The static passivation and adsorption repair method for heavy metal contaminated soil/tailing sand of the tailing sand reservoir is developed in an integrated mode by taking an efficient powdered heavy metal adsorbent as a passivator, mixing the passivator with a heavy metal pollutant according to a certain proportion, simulating acid rain to carry out leaching treatment on a sample and combining a proper pH value and a leaching reaction environment temperature. According to the method disclosed by the invention, the process is simple and easy to carry out, the preparation cost for associated material preparations is low and the used equipment is normal; the static passivation and adsorption repair of soil/tailing sand can be completed by utilizing solid-phase mixing of an adsorbent material and contaminated soil/tailing sand and then utilizing the acid rain to simulate a solution to carry out leaching, so that the passivation and repair effect for solid-phase substance heavy metal contamination is greatly improved. The method can be applied to a wider variety of heavy metal contaminated solid waste treatment.
Description
Technical field
The invention belongs to solid waste resource utilization and remediation contaminated soil technical field, particularly the static passivation absorption restorative procedure of a kind of heavy-metal contaminated soil/Tailings Dam tailings.
Background technology
Along with socioeconomic develop rapidly, the heavy metal pollution of soil problem being representative with arsenic, antimony and chromium becomes increasingly conspicuous, and soil pollution by heavy metal is more and more subject to public attention to the threat that ecological environment, food security and health of human body bring.At present, the restorative procedure of heavy metal contaminated soil has phytoremediation, chemical passivation repairing method, chemical leaching to collect facture and electro reclamation method etc.Wherein chemical passivation repairing method is by adding suitable chemical inactivators to soil, by original position absorption and precipitation, heavy metal in soil stablized or intercept and the heavy metal ion of quick adsorption stripping, reduce its bioavailability in soil environment and animal migration, thus reach stable and repair the object by heavy-metal contaminated soil, the method is because of advantage attention such as its instant effect, Engineering operation are simple.
The selection of key at passivator of restorative procedure is adsorbed in the passivation of heavy-metal contaminated soil, at present, there is domestic and international researcher to report to apply the reparation of the heavy-metal contaminated soils such as Cd, Pb, Zn, Hg, Cr, As with lime, calcium carbonate, flyash, apatite, zeolite and organic compost, also seen the common use report having multiple passivating material simultaneously.
Lose with eucalyptus the plant that state structure Fe/C compound adsorbent is representative and lose the three-dimensional network connectedness of state structural porous heavy metal absorbent due to its special internal structure, dusty material has adsorption cleaning performance fast to arsenic, antimony and chromium in water.As static passivation adsorbent, the ratio of science determination polluted soil and passivation adsorbent, the pH value of leaching liquor, leaching reaction environment temperature, develop a kind of static passivation absorption restorative procedure of heavy-metal contaminated soil, dispose the reparation of heavy metal pollution of soil, the passivation of cemented tailings backfill intercepts absorption reparation extremely important meaning.
Summary of the invention
The object of this invention is to provide the static passivation absorption restorative procedure of a kind of heavy-metal contaminated soil/Tailings Dam tailings.
Thinking of the present invention: with powder high efficient heavy metal absorbent for passivator, mix passivator and heavy metal contaminants according to a certain percentage, Simulated Acid Rain carries out leaching process to sample, in conjunction with suitable pH value, leaching reaction environment temperature, Integrated Development goes out the static passivation absorption restorative procedure of a kind of heavy-metal contaminated soil/Tailings Dam tailings.
Concrete steps are:
(1) will pulverize by heavy-metal contaminated soil or Tailings Dam tailings, naturally dry, cross 100 ~ 200 mesh sieves, extracting screen underflow.
(2) preparing particle diameter is 100 object heavy metal absorbents, and concrete grammar is shown in that the patent No. is the patent of ZL 201110133840.1.
(3) be that 4:1 prepares mixed acid according to sulfuric acid and nitric acid mol ratio, then regulate with distilled water and be made into the Simulated Acid Rain solution that pH value is 5.0 and 3.0 respectively.
(4) heavy metal absorbent screenings obtained for step (1) and step (2) prepared is that 1:0,4:1,8:1 or 16:1 mix according to mass ratio respectively, then fully mix with non magnetic mixing plant, after mixing, complete the pretreatment of sample proportioning.
(5) the Simulated Acid Rain solution that product obtained for 20 ~ 30 grams of steps (4) and step (3) are prepared is mixed in tool plug conical flask according to native water ratio 1:2 ~ 4, and step gradient increased temperatures are waited and water bath with thermostatic control 1 ~ 60 day with 2 DEG C within the scope of 25 ~ 45 DEG C, complete static dipping.
(6) in the process of carrying out in step (5), 10ml supernatant is got respectively at the 0.5th, 1,2,5,10,15,20,25,30,50,60 day, measure the content of its heavy metal element, investigate the actual heavy metal amount leached of static dipping, to have determined whether static passivation absorption restoration of soil polluted by heavy metal/Tailings Dam tailings operation; When the actual heavy metal amount leached of static state dipping is lower than setting, the static passivation absorption then completing soil/Tailings Dam tailings heavy metal pollution is repaired, and its Poisoning is differentiated to perform according to " hazardous waste judging standard leaching characteristic identification " (GB 5085.3-2007) relevant standard value.
The Simulated Acid Rain solution needing the step (3) of supplementing same volume immediately to prepare after each supernatant sampling in described step (6); Sample the actual heavy metal concentration of leachate caused need revise, modification method is as follows:
Actual concentrations is first time actual measurement sampling concentration for the first time;
Second time actual concentrations=(second time measured concentration × overall solution volume+first time measured concentration × sample volume)/overall solution volume;
Third time actual concentrations=(third time measured concentration × overall solution volume+second time measured concentration × sample volume+first time measured concentration × sample volume)/overall solution volume;
……
By that analogy.
The inventive method is simple for process, low cost prepared by associated materials preparation, the equipment used routinizes, simultaneously owing to utilizing the solid phase mixing of sorbent material and polluted soil/tailings, then utilize Modeling of Acid Rain solution to carry out soaking the molten static passivation absorption that can complete soil/tailings to repair, substantially increase the effect that solid matter heavy metal pollution passivation is repaired; This method can be widely used in heavy metal pollution fixed-end forces.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention 1, temperature is 35 DEG C, to the passivation absorption repair process curve of As polluted soil under the condition of pH value=5.
Fig. 2 is that in the embodiment of the present invention 2, temperature is 35 DEG C, to the passivation absorption repair process curve that arsenic in ore in sand form pollutes under the condition of pH value=5.
Detailed description of the invention
embodiment 1:
(1) taking 25g not by heavy-metal contaminated soil sample comminution, is then that the arsenic-containing waste water of 150mg/L joins in 250mL tool plug conical flask with 100mL concentration, and constant temperature water bath vibration is to saturated (35 DEG C; 150r/min; Filter 24h), filter residue sample dries rear mistake 200 mesh sieve naturally, extracting screen underflow.
(2) preparing particle diameter is 100 object heavy metal absorbents, and concrete grammar is shown in that the patent No. is the patent of ZL 201110133840.1.
(3) be that 4:1 prepares mixed acid according to sulfuric acid and nitric acid mol ratio, then regulate with distilled water and be made into the Simulated Acid Rain solution that pH value is 5.0 respectively.
(4) heavy metal absorbent screenings obtained for step (1) and step (2) prepared is that 1:0,4:1,8:1 and 16:1 mix according to mass ratio respectively, then fully mix with non magnetic mixing plant, after mixing, complete the pretreatment of sample proportioning.
(5) the Simulated Acid Rain solution that product obtained for 25 grams of steps (4) and step (3) are prepared is mixed in tool plug conical flask according to native water ratio 1:2.5, and wait step gradient increased temperature to 35 DEG C from 25 DEG C with 2 DEG C, and water bath with thermostatic control 60 days, complete static dipping.
(6) in the process of carrying out in step (5), 10ml supernatant is got respectively at the 0.5th, 1,2,5,10,15,20,25,30,50,60 day, measure the content of its heavy metal element, investigate the actual heavy metal amount leached of static dipping, to have determined whether static passivation absorption restoration of soil polluted by heavy metal operation; When the actual heavy metal amount leached of static state dipping is lower than setting, the static passivation absorption then completing heavy metal pollution of soil is repaired, and its Poisoning is differentiated to perform according to " hazardous waste judging standard leaching characteristic identification " (GB 5085.3-2007) relevant standard value.
The Simulated Acid Rain solution needing the step (3) of supplementing same volume immediately to prepare after each supernatant sampling in described step (6); Sample the actual heavy metal concentration of leachate caused need revise, modification method is as follows:
Actual concentrations is first time actual measurement sampling concentration for the first time;
Second time actual concentrations=(second time measured concentration × overall solution volume+first time measured concentration × sample volume)/overall solution volume;
Third time actual concentrations=(third time measured concentration × overall solution volume+second time measured concentration × sample volume+first time measured concentration × sample volume)/overall solution volume;
……
By that analogy.
embodiment 2:
(1) tailings taking 25g Jin Cheng river Tailings Dam is pulverized, and naturally dries rear mistake 200 mesh sieve, extracting screen underflow.
(2) preparing particle diameter is 100 object heavy metal absorbents, and concrete grammar is shown in that the patent No. is the patent of ZL 201110133840.1.
(3) be that 4:1 prepares mixed acid according to sulfuric acid and nitric acid mol ratio, then regulate with distilled water and be made into the Simulated Acid Rain solution that pH value is 5.0 respectively.
(4) heavy metal absorbent screenings obtained for step (1) and step (2) prepared is that 1:0,4:1,8:1 and 16:1 mix according to mass ratio respectively, then fully mix with non magnetic mixing plant, after mixing, complete the pretreatment of sample proportioning.
(5) the Simulated Acid Rain solution that product obtained for 25 grams of steps (4) and step (3) are prepared is mixed in tool plug conical flask according to native water ratio 1:2.5, and wait step gradient increased temperature to 35 DEG C from 25 DEG C with 2 DEG C, and 35 DEG C of waters bath with thermostatic control 60 days, complete static dipping.
(6) in the process of carrying out in step (5), 10ml supernatant is got respectively at the 0.5th, 1,2,5,10,15,20,25,30,50,60 day, measure the content of its heavy metal element, investigate the actual heavy metal amount leached of static dipping, to have determined whether static passivation absorption repairing heavy metal pollution tailings operation; When the actual heavy metal amount leached of static state dipping is lower than setting, the static passivation absorption then completing the heavy metal pollution of Tailings Dam tailings is repaired, and its Poisoning is differentiated to perform according to " hazardous waste judging standard leaching characteristic identification " (GB 5085.3-2007) relevant standard value.
The Simulated Acid Rain solution needing the step (3) of supplementing same volume immediately to prepare after each supernatant sampling in described step (6); Sample the actual heavy metal concentration of leachate caused need revise, modification method is as follows:
Actual concentrations is first time actual measurement sampling concentration for the first time;
Second time actual concentrations=(second time measured concentration × overall solution volume+first time measured concentration × sample volume)/overall solution volume;
Third time actual concentrations=(third time measured concentration × overall solution volume+second time measured concentration × sample volume+first time measured concentration × sample volume)/overall solution volume;
……
By that analogy.
Claims (1)
1. a static passivation absorption restorative procedure for heavy-metal contaminated soil/Tailings Dam tailings, is characterized in that concrete steps are:
(1) will pulverize by heavy-metal contaminated soil or Tailings Dam tailings, naturally dry, cross 100 ~ 200 mesh sieves, extracting screen underflow;
(2) preparing particle diameter is 100 object heavy metal absorbents, and concrete grammar is shown in that the patent No. is the patent of ZL 201110133840.1;
(3) be that 4:1 prepares mixed acid according to sulfuric acid and nitric acid mol ratio, then regulate with distilled water and be made into the Simulated Acid Rain solution that pH value is 5.0 and 3.0 respectively;
(4) heavy metal absorbent screenings obtained for step (1) and step (2) prepared is that 1:0,4:1,8:1 or 16:1 mix according to mass ratio respectively, then fully mix with non magnetic mixing plant, after mixing, complete the pretreatment of sample proportioning;
(5) the Simulated Acid Rain solution that product obtained for 20 ~ 30 grams of steps (4) and step (3) are prepared is mixed in tool plug conical flask according to native water ratio 1:2 ~ 4, and step gradient increased temperatures are waited and water bath with thermostatic control 1 ~ 60 day with 2 DEG C within the scope of 25 ~ 45 DEG C, complete static dipping;
(6) in the process of carrying out in step (5), 10ml supernatant is got respectively at the 0.5th, 1,2,5,10,15,20,25,30,50,60 day, measure the content of its heavy metal element, investigate the actual heavy metal amount leached of static dipping, to have determined whether static passivation absorption restoration of soil polluted by heavy metal/Tailings Dam tailings operation; When the actual heavy metal amount leached of static state dipping is lower than setting, the static passivation absorption then completing soil/Tailings Dam tailings heavy metal pollution is repaired, and its Poisoning is differentiated to perform according to " hazardous waste judging standard leaching characteristic identification " (GB 5085.3-2007) relevant standard value;
The Simulated Acid Rain solution needing the step (3) of supplementing same volume immediately to prepare after each supernatant sampling in described step (6); Sample the actual heavy metal concentration of leachate caused need revise, modification method is as follows:
Actual concentrations is first time actual measurement sampling concentration for the first time;
Second time actual concentrations=(second time measured concentration × overall solution volume+first time measured concentration × sample volume)/overall solution volume;
Third time actual concentrations=(third time measured concentration × overall solution volume+second time measured concentration × sample volume+first time measured concentration × sample volume)/overall solution volume;
……
By that analogy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110860548A (en) * | 2019-11-06 | 2020-03-06 | 贵州大学 | Control method for high-sulfur high-iron gangue pollutant release and passivation material thereof |
| CN114486824A (en) * | 2021-12-27 | 2022-05-13 | 南京大学 | Soil system-oriented high-resolution technology-coupled heavy metal in-situ characterization system for simulating pH change |
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| CN102258976B (en) * | 2011-05-20 | 2013-01-02 | 桂林理工大学 | Preparation method of eucalyptus biomorphic Fe2O3/Fe3O4 composite heavy metal adsorbent |
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| CN104388094A (en) * | 2014-10-13 | 2015-03-04 | 广东省生态环境与土壤研究所（广东省土壤科学博物馆） | Iron-based bio-char material, preparation process thereof, and application thereof in soil pollution treatment |
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| US5769961A (en) * | 1995-05-16 | 1998-06-23 | The University Of Chicago | Remediation of arsenic-contaminated soils and groundwaters |
| WO2012023661A1 (en) * | 2010-08-20 | 2012-02-23 | 한국지질자원연구원 | Remediation method of soil contaminated with arsenic |
| CN102258976B (en) * | 2011-05-20 | 2013-01-02 | 桂林理工大学 | Preparation method of eucalyptus biomorphic Fe2O3/Fe3O4 composite heavy metal adsorbent |
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Cited By (3)
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| CN110860548A (en) * | 2019-11-06 | 2020-03-06 | 贵州大学 | Control method for high-sulfur high-iron gangue pollutant release and passivation material thereof |
| CN114486824A (en) * | 2021-12-27 | 2022-05-13 | 南京大学 | Soil system-oriented high-resolution technology-coupled heavy metal in-situ characterization system for simulating pH change |
| CN114486824B (en) * | 2021-12-27 | 2024-04-09 | 南京大学 | High-resolution technology coupling heavy metal in-situ characterization system for simulating pH change and facing soil system |
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Effective date of registration: 20180929 Address after: 100095 the first floor, 101 to 4 floor, 13 building, 9 Jin Jie Road, Haidian District, Beijing, -1. Patentee after: Beijing GeoEnviron Engineering & Technology, Inc. Address before: No. 12, Jian Gong Road, Guilin, the Guangxi Zhuang Autonomous Region Patentee before: Guilin University of Technology |