CN104550223A - Treatment method of Ni and Pb contaminated soil remediation - Google Patents
Treatment method of Ni and Pb contaminated soil remediation Download PDFInfo
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- CN104550223A CN104550223A CN201410737359.7A CN201410737359A CN104550223A CN 104550223 A CN104550223 A CN 104550223A CN 201410737359 A CN201410737359 A CN 201410737359A CN 104550223 A CN104550223 A CN 104550223A
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Abstract
The invention provides a treatment method of Ni and Pb contaminated soil remediation. The treatment method comprises the following steps: (1) carrying out acid pickling pretreatment on taken steel slag raw materials, and then taking out, and drying for later use; (2) grinding and sieving the spare steel slag raw material to obtain steel slag granules; and (3) adding the steel slag granules into nickel and lead-containing contaminated soil, adding water and mixing and stirring, and then backfilling the processed soil to original contaminated sites, and naturally curing. According to the treatment method of Ni and Pb contaminated soil remediation provided by the invention, after a small amount of steel slag raw material is subjected to acid pickling treatment, the porosity can be increased and the opportunity of contact between a medicament and a pollutant is improved; meanwhile, the steel slag granules used as a loose and porous silicate-containing substance with a large specific surface area and heavy metals generate ion exchange, surface coordination and co-precipitation and other effects to reduce the effectiveness of the heavy metals in soil together. The method has the advantages of simple process, low cost, good stability, and good economic, social and environmental benefits, and capability of turning waste into treasure.
Description
Technical field
The invention belongs to contaminated soil Treatment process field, be specifically related to a kind of administering method of Ni, Pb contaminated soil remediation.
Background technology
In recent years, China's industrial production causes a large amount of pollutions to environment, and particularly disguised higher soil contamination problem manifests day by day.Heavy metal pollution of soil is nickel, lead contamination problem particularly, because nickel, lead can be accumulated, and then affects health and receive much concern.Nickel, lead have higher toxicity, chronicity and non mobility, once contaminated soil, under the acting in conjunction of soil various ingredients, physics, chemistry and biological agent can occur, its existing forms be changed, causes the change of its animal migration and biological effectiveness.
Nickel in soil, the Factors Resulting in Lead Contamination are in the industrial and mining enterprises smelting, manufacture and use nickel, leadwork, especially cause from nickeliferous, plumbous waste water, waste gas and the waste residue of discharging in nonferrous metallurgical process, the discharge of the infiltration of refuse that mining produces and deposition, vehicle exhaust also can pollute.It is estimated, the arable land that China coastal seas enters 1/5 is subject to lead contamination, and in deserted land by mining, nickel reserves reach 867.72 ten thousand tons especially, are distributed widely in 18 provinces and cities such as Gansu, Xinjiang, Sichuan, Yunnan, Guangdong, Jilin, Hubei by the soil of nickel contamination.
At present, mainly join for the recovery technique of nickel, lead-contaminated soil and have isolation embedding techniques, fixing-stable technology, chemically stable technology, microorganism remediation and plant extract technology etc.Due to factors such as microorganism and plant extract technology repairing efficiency are long, chemically stable technology is large to soil fail, isolation embedding techniques construction volume is larger, solidification and stabilization is the major measure that heavy metal pollution is repaired always, particularly stabilization technology, selects cost-effective medicament that soil can be made on the basis of keeping intact to repair pollution problem.At present, main heavy metal stabilization medicament to adsorb class medicament and chemical reaction class medicament, as bentonite, sepiolite, attapulgite, potassium dihydrogen phosphate, sulfide, rock phosphate in powder etc.
But, need in natural minerals stabilization material manufacture process to consume a large amount of energy and natural resources, while welding, cause the waste of resource.If phosphatic source is generate with the substance reaction such as rock phosphate in powder and sulfuric acid substantially, very easily produces a large amount of pollution in ore extraction and chemical process, and easily cause the too exploitation of resource.The medicament of chemical reaction class due to cost higher, chemical reaction is vulnerable to ambient influnence and limits it and use, and is vulnerable to condition restriction as metal-chelator not only reacts, and expensive.General patent investigation situation is also deficienter to the research of nickel, plumbous soil remediation method in soil at present.Therefore, be necessary further investigation and inquire into, find new replacement scheme.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of administering method of Ni, Pb contaminated soil remediation, for the problem of existing Ni, Pb heavy-metal contaminated soil, developing with slag is the raw-material method of repairing Ni, Pb and polluting, for slag comprehensive utilization expands new way.
For achieving the above object and other relevant objects, the invention provides a kind of administering method of Ni, Pb contaminated soil remediation, comprise the following steps:
1) get slag raw material to carry out taking out after pickling pretreatment, drying, for subsequent use;
Preferably, described slag raw material is selected from any one in electroslag or vessel slag.
Preferably, described pickling pretreatment for add acid soak in slag raw material, then after soak is discharged, with water continuous flushing until slag pH value is in neutral.
Further, described acid is selected from any one in hydrochloric acid or sulfuric acid.
Further, the acidity pH value of described acid is 2 ± 0.05.
Further, the addition of described acid is submergence slag raw material.
Further, described soak time is 24 ± 0.5h.More preferably, described soak time is 24h.
Further, described pickling pretreatment is carried out in reaction tank.
Particularly, described reaction tank is the pond being provided with floss hole at the bottom of pond, being made up of steel slag concrete.Described floss hole is provided with stopper.Described stopper can control the discharge of soak, when needs soak, is clogged by stopper; When needs discharge, stopper is unpluged.
Further, described water is running water.
Further, during described water continuous flushing, floss hole be kept to be in opening-wide state.
Further, described neutrality is pH=7 ± 0.05.
Preferably, described taking-up for workman adopt engineering machinery take out through the pretreated slag raw material of pickling.
Preferably, described drying condition is: bake out temperature: 400-600 DEG C; Drying time: 3-5 hour.
2) by slag raw material for subsequent use after levigate, screening, obtain steel slag particle material;
Preferably, described levigate mode is for adopting ball mill levigate.
Preferably, described screening is gradation sizing.Described gradation sizing can obtain the steel slag particle material of different meshes.
Preferably, the performance condition of described steel slag particle material is: specific area>=450m
2/ kg; 28 days activity≤5wt%; Leaching of Heavy Metals concentration (adopting professional standard HJ/T300-2007 " solid waste Leaching leaching method hac buffer method " to detect): lower than I class standard setting in standard GB/T/T14848-1993 " groundwater quality standard ".
Preferably, the fineness of described steel slag particle material is 60-200 order.
Further, for nickel contamination soil, the fineness of described steel slag particle material can be 60-200 order; For lead-contaminated soil, the fineness of described steel slag particle material can be 80-200 order.
Optimally, the fineness of described steel slag particle material is 160-200 order.
Described steel slag particle material can according to real cost of production in application process, and in each feasibility range, an optional single-stage is joined, and also can carry out multistage compounding conjunction, saves cost.
3) steel slag particle material is added in nickeliferous, plumbous contaminated soil, be backfilled to former contaminated site after the mix and blend that adds water, natural curing.
Preferably, the incorporation of described steel slag particle material is 15-30wt%.Further, the incorporation of described steel slag particle material is 30wt%.
Preferably, the solvent and solute weight ratio of the addition of described water and the addition of steel slag particle material and soil is: 1:3-4.
Preferably, described stirring uses mixer to carry out.Further, described mixer is Universal stirring machine.Particularly, described mixer is the JS1500 type mixer that Zhengzhou Heng Long plant equipment Co., Ltd produces.
Preferably, described stirring required time is the convention stir time.Further, described stirring required time is 8-12 minute.
Preferably, described natural curing time >=28 days.Described natural curing, for directly being stacked by soil after process, is naturally placed after 28 days, is backfilled to former Pollution Field melt pit place.
The present invention also provides a kind of administering method of Ni, Pb contaminated soil remediation repairing the application comprised in the contaminated soil of Ni, Pb further.
As mentioned above, the administering method of a kind of Ni, Pb contaminated soil remediation of the present invention, has following beneficial effect:
1) the invention provides a kind of take slag as the method for reparation Ni, Pb contaminated soil of raw material, after slag raw material is carried out a small amount of acidification, the easy stripping in slag space and surface can be removed to a certain extent and the foreign ion harmful to soil, as Fe, Mn, Al etc.This increases porosity to a certain extent, improves the touch opportunity of medicament and pollutant, improves reaction efficiency, is beneficial to slag stabilisation heavy metal.Meanwhile, acidizing pretreatment process can improve the purity of steel slag particle material, reduces the use amount of steel slag particle material, also can reduce certain construction volume, the input of the saving resource energy in practical application engineering.
2) steel slag particle material is large and have the material of certain silicate content as a kind of loose porous, specific area, after entering soil system, due to porous feature, there is stronger adsorption capacity, enable pollutant enter into the space of steel slag particle material smoothly.Meanwhile, the anion of the silicate Sum decomposition contained in steel slag particle material, can produce the effects such as ion-exchange, surface coordination, co-precipitation with heavy metal, the common validity reducing heavy metal in soil.If the silicate in steel slag particle material is at earth liquid phase cationic M
2+, N
+aquation can be far longer than SiO
4 4-and AlO
4 5-aquation energy, so M
2+, N
+ion optimum solvation enters system, thus each surface band negative electrical charge of slag, each surface of slag can be attracted to by electrostatic attraction thus be removed.In addition, silicate granules surface can form hydrous oxide cover layer-SiOH with water, with Ni, surface coordination effect occurs.Slag also can by the dissolution of self, and generation anion and pollution element produce co-precipitation, and reach the object of stable pollutant.
3), in the technology of the repairing polluted soil of at present application, stabilization material or expensive, material or be taken from natural minerals, easily causes environmental pollution and resource exhaustive exploitation.Utilize slag as the stabilization agent of nickel, lead-contaminated soil reparation, comparatively simple in technique, the new way of slag comprehensive utilization can either be opened up, for China's slag comprehensive utilization explores the road made new advances, can turn waste into wealth again, there is good economy, society, environmental benefit.
4) the invention provides a kind of take slag as the method for reparation Ni, Pb contaminated soil of raw material, the Leaching of its nickel processed, lead-contaminated soil can meet the regulation in standard GB/T 5085.3-2007 " danger wastes judging standard-leaching characteristic identification ", and solidification has good stability.
Accompanying drawing explanation
Fig. 1 is shown as the process flow diagram of the administering method of a kind of Ni, Pb contaminated soil remediation of the present invention
Detailed description of the invention
Set forth the present invention further below in conjunction with specific embodiment, should be understood that these embodiments are only not used in for illustration of the present invention and limit the scope of the invention.
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this description can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by detailed description of the invention different in addition, and the every details in this description also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
The raw material that following examples adopt and equipment:
1, raw material
Electroslag, vessel slag, purchased from upper Hypon smelting slag comprehensive exploitation Industrial Co., Ltd.; Water is running water; Hydrochloric acid, sulfuric acid (analyze pure, Shanghai and the autumn Trade Co., Ltd.); Nickeliferous, lead-contaminated soil, original soil is polluted in mining area, Guizhou
2, equipment
JS1500 type mixer, purchased from Zhengzhou Heng Long plant equipment Co., Ltd; XSenes7 type inductively coupled plasma spectrometry GC-MS (ICP-MS), purchased from American ThermoElemental company
Embodiment 1
1, processing method
As shown in Figure 1, get 2000kg slag raw material and put into reaction tank, the pH value added be 2 ± 0.05 hydrochloric acid or aqueous sulfuric acid until flood slag raw material, carry out pickling pretreatment, after unpluging pond bottom plug releasing waste liquid, again with running water continuous flushing until slag pH value is 7 ± 0.05, by slag raw material take out dry with for subsequent use.Described drying condition is: bake out temperature: 400-600 DEG C; Drying time: 3-5 hour.By slag raw material for subsequent use after levigate, gradation sizing, obtain the steel slag particle material of different meshes.The performance condition of described steel slag particle material is: specific area>=450m
2/ kg; 28 days activity≤5wt%; Leaching of Heavy Metals concentration (adopting professional standard HJ/T300-2007 " solid waste Leaching leaching method hac buffer method " to detect): lower than I class standard setting in standard GB/T/T14848-1993 " groundwater quality standard ".The fineness of described steel slag particle material is 60-200 order.Wherein, for nickel contamination soil, the fineness of described steel slag particle material is 60-200 order; For lead-contaminated soil, the fineness of described steel slag particle material is 80-200 order.
Get the steel slag particle material prepared of 500kg, be that 15-30% joins in nickeliferous, plumbous contaminated soil by incorporation, add water mix and blend, and the solvent and solute weight ratio of described water and solid (steel slag particle material and soil gross weight) is: 1:3-4.Stir after 8-12 minute, nickeliferous, the plumbous contaminated soil being mixed with steel slag particle material is stacked in former contaminated site, then carry out natural curing after 28 days, be backfilled to former Pollution Field melt pit place.
According to professional standard HJ/T299-2007 " solid waste Leaching leaching method sulfonitric method ", Leaching of Heavy Metals is carried out to sample, ICP-MS method is adopted to carry out the mensuration of Ni, Pb content, and according to the regulation in standard GB/T 5085.3-2007 " hazardous waste judging standard-leaching characteristic identification " as Leaching of Heavy Metals effect foundation whether up to standard.
2, result and discussion
The selection of 2.1 different meshes steel slag particle material
Select the steel slag particle material of different meshes, get 50g respectively, be 20% join in nickeliferous, plumbous contaminated soil (original soil is polluted in mining area, Guizhou) by incorporation, Leaching of Heavy Metals concentration detection method is according to professional standard HJ/T299-2007 " solid waste Leaching leaching method sulfonitric method ", with standard GB/T 5085.3-2007 " hazardous waste judging standard-leaching characteristic identification " for heavy metal stabilization effect foundation whether up to standard, total Ni, Pb Leaching of Heavy Metals concentration in leachate adopts ICP-MS to measure.Concrete data are in Table 1-2.
Table 1 mixes the testing result of total Ni leaching concentration in the soil of different meshes steel slag particle material
Table 2 mixes the testing result of total Pb leaching concentration in the soil of different meshes steel slag particle material
From table 1-2, after adopting the steel slag particle material of certain order number to administer, total Ni, Pb content of beary metal in soil extract all can be up to state standards the standard that total Ni of regulation is less than 5mg/L, total Pb is less than 5mg/L in GB5085.3-2007 " hazardous waste judging standard-leaching characteristic identification ".Further, when the fineness of steel slag particle material is 160-200 order, in soil extract, the clearance of total Ni is 99.28%, and the clearance of total Pb is 98.56%, best results.
The selection of the different incorporation of 2.2 steel slag particle material
The testing result of total Ni leaching concentration in the soil of table 3 different incorporation steel slag particle material
The testing result of total Pb leaching concentration in the soil of table 4 different incorporation steel slag particle material
Select the steel slag particle material of identical 160-200 order number, get 37.5g respectively, 50g, 62.5g, 75g, by 15%, 20%, 25%, 30% different incorporation joins nickeliferous, in plumbous contaminated soil (original soil is polluted in mining area, Guizhou), Leaching of Heavy Metals concentration detection method is according to professional standard HJ/T299-2007 " solid waste Leaching leaching method sulfonitric method ", with standard GB/T 5085.3-2007 " hazardous waste judging standard-leaching characteristic identification " for heavy metal stabilization effect foundation whether up to standard, total Ni in leachate, Pb Leaching of Heavy Metals concentration adopts ICP-MS to measure.Concrete data are in Table 3-4.
From table 3-4, after adopting the steel slag particle material of different incorporation to administer, total Ni, Pb content of beary metal in soil extract all can be up to state standards the standard that total Ni of regulation is less than 5mg/l, total Pb is less than 5mg/l in GB5085.3-2007 " hazardous waste judging standard-leaching characteristic identification ".Further, along with the increase of mix ratio, regulation effect is stablized gradually, can not significantly rise.When incorporation is 30%, in soil extract, the clearance of total Ni is 99.46%, and the clearance of total Pb is 98.86%, best results.
3, conclusion
The present invention is by selecting the steel slag particle material of certain order number and incorporation, add in nickeliferous, plumbous contaminated soil, thus the content of total Ni and total Pb in the leachate of contaminated soil is reduced greatly, its content meets the regulation that total Ni in standard GB/T 5085.3-2007 " hazardous waste judging standard-leaching characteristic identification " is less than 5mg/L, total Pb is less than 5mg/L.The inventive method solidification effect is remarkable, and stabilisation efficiency, all more than 98%, has excellent actual application value.
In sum, the administering method of a kind of Ni, Pb contaminated soil remediation of the present invention, after slag raw material is carried out a small amount of acidification, porosity can be increased, improve the touch opportunity of medicament and pollutant, simultaneously steel slag particle material as a kind of loose porous, specific area large and have the material of silicate content, can produce the effects such as ion-exchange, surface coordination, co-precipitation, the common validity reducing heavy metal in soil with heavy metal.And this method technique simple, with low cost, turn waste into wealth, solidification has good stability, and has good economy, society, environmental benefit.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. an administering method for Ni, Pb contaminated soil remediation, comprises the following steps:
1) get slag raw material to carry out taking out after pickling pretreatment, drying, for subsequent use;
2) by slag raw material for subsequent use after levigate, screening, obtain steel slag particle material;
3) steel slag particle material is added in nickeliferous, plumbous contaminated soil, be backfilled to former contaminated site after the mix and blend that adds water, natural curing.
2. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 1, it is characterized in that, step 1) in, described pickling pretreatment for add acid soak in slag raw material, after again soak being discharged, with water continuous flushing until slag pH value is in neutral.
3. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 2, is characterized in that, described acid be selected from hydrochloric acid or sulfuric acid any one; The acidity pH value of described acid is 1.95-2.05.
4. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 2, is characterized in that, described soak time is 23.5-24.5h; Described pickling pretreatment is carried out in reaction tank.
5. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 2, it is characterized in that, described drying condition is: bake out temperature: 400-600 DEG C; Drying time: 3-5 hour.
6. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 1, is characterized in that, step 2) in, the fineness of described steel slag particle material is 60-200 order.
7. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 6, is characterized in that, for nickel contamination soil, the fineness of described steel slag particle material is 60-200 order; For lead-contaminated soil, the fineness of described steel slag particle material is 80-200 order.
8. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 1, is characterized in that, step 3) in, the incorporation of described steel slag particle material is 15-30wt%; The solvent and solute weight ratio of the addition of described water and the addition of steel slag particle material and soil is: 1:3-4.
9. the administering method of a kind of Ni, Pb contaminated soil remediation according to claim 1, is characterized in that, step 3) in, described natural curing time >=28 days.
10. repairing according to the administering method of arbitrary described a kind of Ni, Pb contaminated soil remediation of claim 1-9 the application comprised in the contaminated soil of Ni, Pb.
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| CN201410737359.7A CN104550223A (en) | 2014-12-05 | 2014-12-05 | Treatment method of Ni and Pb contaminated soil remediation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105419806A (en) * | 2015-11-30 | 2016-03-23 | 南昌大学 | Heavy metal-polluted acid soil modifying agent and application thereof |
| CN106241995A (en) * | 2016-09-19 | 2016-12-21 | 上海中冶环境工程科技有限公司 | Electroslag purposes in preparing leaded sewage-treating agent |
| CN106281330A (en) * | 2015-05-14 | 2017-01-04 | 北京市农林科学院 | A kind of heavy metal deactivator |
| CN107159704A (en) * | 2017-06-22 | 2017-09-15 | 东北大学 | A kind of method for repairing mercury contaminated soil |
| CN108003875A (en) * | 2017-11-28 | 2018-05-08 | 上海中冶环境工程科技有限公司 | A kind of stabilization material for heavy metal soil remediation and preparation method thereof |
| CN108130092A (en) * | 2017-12-23 | 2018-06-08 | 郭舒洋 | A kind of composite soil passivator |
| CN109370596A (en) * | 2018-11-20 | 2019-02-22 | 大连理工大学 | A kind of in-situ passivation the reparation medicament, preparation method and application of cadmium arsenic combined pollution agricultural land soil |
| CN109627115A (en) * | 2018-12-13 | 2019-04-16 | 河北大学 | A kind of passivator of remediating lead-contaminated soil and preparation method thereof |
| CN110976506A (en) * | 2019-12-20 | 2020-04-10 | 纳琦绿能工程有限公司 | Curing and stabilizing repairing agent for polluted soil and repairing method thereof |
| CN111939922A (en) * | 2019-05-17 | 2020-11-17 | 中国科学院过程工程研究所 | Catalyst for catalyzing hydrogen peroxide to oxidize NO, preparation method and application thereof |
| CN112300804A (en) * | 2020-11-27 | 2021-02-02 | 中冶宝钢技术服务有限公司 | Heavy metal contaminated soil curing agent and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106281330A (en) * | 2015-05-14 | 2017-01-04 | 北京市农林科学院 | A kind of heavy metal deactivator |
| CN105419806A (en) * | 2015-11-30 | 2016-03-23 | 南昌大学 | Heavy metal-polluted acid soil modifying agent and application thereof |
| CN106241995A (en) * | 2016-09-19 | 2016-12-21 | 上海中冶环境工程科技有限公司 | Electroslag purposes in preparing leaded sewage-treating agent |
| CN107159704A (en) * | 2017-06-22 | 2017-09-15 | 东北大学 | A kind of method for repairing mercury contaminated soil |
| CN108003875A (en) * | 2017-11-28 | 2018-05-08 | 上海中冶环境工程科技有限公司 | A kind of stabilization material for heavy metal soil remediation and preparation method thereof |
| CN108130092A (en) * | 2017-12-23 | 2018-06-08 | 郭舒洋 | A kind of composite soil passivator |
| CN109370596A (en) * | 2018-11-20 | 2019-02-22 | 大连理工大学 | A kind of in-situ passivation the reparation medicament, preparation method and application of cadmium arsenic combined pollution agricultural land soil |
| CN109627115A (en) * | 2018-12-13 | 2019-04-16 | 河北大学 | A kind of passivator of remediating lead-contaminated soil and preparation method thereof |
| CN111939922A (en) * | 2019-05-17 | 2020-11-17 | 中国科学院过程工程研究所 | Catalyst for catalyzing hydrogen peroxide to oxidize NO, preparation method and application thereof |
| CN111939922B (en) * | 2019-05-17 | 2021-11-26 | 中国科学院过程工程研究所 | Catalyst for catalyzing hydrogen peroxide to oxidize NO, preparation method and application thereof |
| CN110976506A (en) * | 2019-12-20 | 2020-04-10 | 纳琦绿能工程有限公司 | Curing and stabilizing repairing agent for polluted soil and repairing method thereof |
| CN112300804A (en) * | 2020-11-27 | 2021-02-02 | 中冶宝钢技术服务有限公司 | Heavy metal contaminated soil curing agent and preparation method and application thereof |
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Application publication date: 20150429 |