EP2400058A1 - Recycling von Sand - Google Patents

Recycling von Sand Download PDF

Info

Publication number
EP2400058A1
EP2400058A1 EP10167116A EP10167116A EP2400058A1 EP 2400058 A1 EP2400058 A1 EP 2400058A1 EP 10167116 A EP10167116 A EP 10167116A EP 10167116 A EP10167116 A EP 10167116A EP 2400058 A1 EP2400058 A1 EP 2400058A1
Authority
EP
European Patent Office
Prior art keywords
sand
road sand
road
recycling
organic materials
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10167116A
Other languages
English (en)
French (fr)
Inventor
Kurt B. Hansen
Jens Ole Bidstrup
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCC Roads Holding AB
Original Assignee
NCC Roads Holding AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NCC Roads Holding AB filed Critical NCC Roads Holding AB
Priority to EP10167116A priority Critical patent/EP2400058A1/de
Publication of EP2400058A1 publication Critical patent/EP2400058A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H12/00—Cleaning beaches or sandboxes

Definitions

  • the present invention relates to a method for recycling road sand, use of road sand recycled according to the method in an asphalt or concrete mix, and an asphalt or concrete mix comprising road sand recycled according to the method, according to the preambles of the independent claims.
  • sand and gravel are oftentimes used to increase surface friction, reduce braking distance on icy and slippery roads and to ensure non-slippery walking conditions during the winter. After the winter, the spread out sand and gravel has to be collected from the road system by means of road sweepers.
  • the collected sand and gravel contains a considerable amount of particles hazardous to the environment, e.g. from asphalt, tyres and exhaust gas.
  • hazardous particles may be: rubber residue, PAH (Polycyclic Aromatic Hydrocarbons), oil residue, heavy metals and other organic environmental pollutions.
  • PAH Polycyclic Aromatic Hydrocarbons
  • the collected sand and gravel may therefore be regarded as hazardous waste.
  • a problem is that disposal of hazardous waste often involves a cost, since it has to be disposed properly at appropriate recycling plants.
  • JP 2000 263026 discloses a method including concrete scraps being crushed into sand, which sand subsequently is separated into sand and powder which may be used for example as an extender for cement or asphalt.
  • JP 2000 263026 and US 7 448 825 B2 relates to recycling of concrete scraps and an asphalt layer of a paved road, respectively, and these methods are not applicable for the recycling of road sand.
  • an obj ect of the present invention is to recycle road sand by using it in production of asphalt or concrete.
  • the hazardous particles are bound, when mixed into the asphalt or concrete. Since the asphalt or concrete acts as a binder for the hazardous particles, the road sand does not need to be completely purified, but may contain a greater amount of hazardous particles than if the road sand would have been reused as road sand.
  • the method for recycling road sand includes the steps of:
  • step b) further includes the sub step of:
  • step a) instead includes the sub step of b1), such that the metal screening is performed before the first mechanical sorting. It is an advantage to be able to vary the disposition of the plant depending on for example the condition of the collected sand.
  • step b) includes the sub step of:
  • step c) includes the sub step of:
  • step c1) further includes separating said stones from said organic materials, preferably by means of a logwasher. Step c1) and step c2) is then performed in the same step, which may be time saving.
  • step c1) includes the sub step of:
  • step c1.2 is followed by step:
  • step c1.3) further includes the sub step of:
  • the water which is separated in this step may advantageously be reused in step c1).
  • Each step in the method for recycling road sand according to the present invention, helps to improve the quality of the separated sand and stones, i.e. the quality of the remaining road sand.
  • the road sand becomes stepwise cleaner.
  • Each step also increases the amount of sand and stones obtained from the collected road sand.
  • the present invention further includes use of road sand recycled, according to the method for recycling road sand as described above, in an asphalt or concrete mix.
  • the road sand is advantageously reused, and at the same time hazardous particles are prevented from leaking out and contaminating the environment.
  • the present invention also includes an asphalt or concrete mix comprising road sand recycled according to the method for recycling road sand, as described above.
  • the asphalt or concrete mix safely retains the hazardous particles which are still remaining in the remaining road sand, and thus prevents the hazardous particles from leaking out in the surroundings. Thereby, the hazardous particles are prevented from contaminating the environment.
  • the method for recycling road sand includes the steps of: collecting the road sand 1, a first mechanical sorting 2a of the road sand for separating stones and organic materials from the road sand, washing 3 the road sand for further separating organic materials from the road sand, and finally reusing 4 the remaining road sand in production of asphalt or concrete by mixing the remaining road sand into an asphalt or a concrete mix.
  • the road sand is preferably collected from the roads by means of conventional road sweepers.
  • the collected road sand contains not only sand, but also stones, branches, leaves and other things which may be in the road shoulder. Therefore, a first mechanical sorting 2a is performed wherein organic materials and stones are separated from the collected road sand.
  • the organic materials and stones which are separated preferably have a size exceeding 40 mm. Thus, in this step large fragments are separated from the collected road sand.
  • the road sand is washed 3.
  • This step is preferably performed by means of a sand washer and separates the road sand from organic materials still present in the road sand after the first mechanical sorting 2a.
  • the organic materials which has been separated from the road sand in the first mechanical sorting 2a and the washing 3 are preferably brought to a facility suitable for composting organic materials 6.
  • the method for recycling road sand according to the present invention may be performed at a facility for recycling road sand or in place, in the area where the sand is being collected.
  • the method for recycling road sand includes the steps of:
  • the first mechanical sorting 2a further includes the sub step of b1).
  • This step comprises metal screening 5 of the road sand for removing metal objects.
  • the metal screening 5 is preferably performed by means of a magnetic separator, such as a magnetic band.
  • the metal screening 5 of the road sand may be followed by the sub step of b2), which step comprises a second mechanical sorting 2b for separating waste materials from the road sand.
  • step a) is followed by the sub step of b1).
  • first mechanical sorting 2a and the second mechanical sorting 2b may be performed in the same step. This means that organic materials and stones and waste materials are separated simultaneously. Naturally, this simultaneous first and second mechanical sorting 2a, 2b may be followed by a metal screening 5 of said road sand.
  • the second mechanical sorting 2b may be performed prior to the metal screening 5.
  • step c) further includes step c1).
  • step c1) the road sand and a filler product are separated from stones and yet further organic materials.
  • the filler product consists of sand, which has a grain size of approximately 0 to 2 mm, and organic material.
  • This step is preferably performed by means of a sand washer. In the sand washer up to approximately 6000 litres of water is added to the road sand. The water helps to separate the road sand and the filler product from stones and organic materials.
  • the stones may thereafter be further separated from organic materials, according to step c2). This separation is preferably carried out by means of a logwasher.
  • the logwasher is designed to remove still remaining organic materials from stones.
  • a conventional logwasher is provided with two inclined shafts which agitates the materials using the archimedial screw principal, and the stones are pushed forward towards a discharge chute. The stones separated in step c2) are then recycled and mixed into an asphalt or concrete mix.
  • the separation of the road sand and the filler product from stones and yet further organic materials, and the separation of stones and organic materials may be performed simultaneously, which means that step c1) is performed in the same step as step c2).
  • the separation of the road sand and the filler product from stones and yet further organic materials according to step c1) includes the sub step of c1.1).
  • step c1.1) the road sand is separated from the filler product and further organic materials.
  • the sand which is separated in this step has a grain size of approximately 0-4 mm. This sand is reused in production of asphalt or concrete, thus, the sand is recycled and mixed into an asphalt or concrete mix.
  • step c1.2 After the road sand has been separated from the filler product, the filler product and further organic materials are separated from water, in step c1.2). Thereafter, the filler product is separated from remaining organic materials, in step c1.3). In this step the finest grained sand, which as mentioned above has a grain size of approximately 0 to 2 mm, is separated and recycled and mixed into an asphalt or concrete mix.
  • step c1.3) may further include the sub step of c1.3.1).
  • step c1.3.1) the filler product is separated from water. After the water has been separated, a remainder containing the filler product is left.
  • the water being used in the sand washer, which is separated in step c1 .2) and step c1 .3.1) is preferably recycled and reused in the sand washer, as illustrated in Figure 2 .
  • the present invention further relates to use of road sand recycled according to the method for recycling road sand as described above in an asphalt or concrete mix.
  • the present invention also relates to an asphalt or concrete mix comprising road sand recycled according to the method for recycling road sand, as described above.
  • the asphalt or concrete mix safely retains the hazardous particles which are still remaining in the remaining road sand, and thus prevents the hazardous particles from leaking out in the surroundings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
EP10167116A 2010-06-24 2010-06-24 Recycling von Sand Withdrawn EP2400058A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10167116A EP2400058A1 (de) 2010-06-24 2010-06-24 Recycling von Sand

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10167116A EP2400058A1 (de) 2010-06-24 2010-06-24 Recycling von Sand

Publications (1)

Publication Number Publication Date
EP2400058A1 true EP2400058A1 (de) 2011-12-28

Family

ID=43302506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10167116A Withdrawn EP2400058A1 (de) 2010-06-24 2010-06-24 Recycling von Sand

Country Status (1)

Country Link
EP (1) EP2400058A1 (de)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB277216A (en) * 1926-10-29 1927-09-15 Trinidad Improved manufacture of coatings for roadways
FR2408691A1 (fr) * 1977-11-10 1979-06-08 Costa Alain Engin automobile recuperateur de gravillons ou similaires
NL8104452A (nl) * 1981-09-29 1983-04-18 Johannes Hendrikus Josephus Vo Werkwijze en inrichting voor het terugwinnen van zand-en steenfracties uit hoeveelheden van bouw- of sloopafval.
DE3248493A1 (de) * 1982-12-29 1984-07-12 Lindemann Maschinenfabrik GmbH, 4000 Düsseldorf Verfahren zum rueckgewinnen von wertstoffen aus mischabfaellen der bauwirtschaft und anlage zum durchfuehren des verfahrens
DE3824710A1 (de) * 1988-07-20 1990-01-25 Edelhoff Polytechnik Verfahren und vorrichtung zum reinigen von mit koernigem material bestreuten boeden von staub und schmutz
DE19617501A1 (de) * 1996-05-03 1997-11-06 Akw Apparate Verfahren Verfahren zur Trennung der Bestandteile von kommunalen Reststoffen, sowie Anordnung insbesondere zur Durchführung dieses Verfahrens
US5762780A (en) * 1994-12-15 1998-06-09 Solv-Ex Corporation Method and apparatus for removing bituminous oil from oil sands without solvent
JP2000263026A (ja) 1999-03-19 2000-09-26 Nippon Kosan Kk コンクリートガラの再資源化方法
KR20040084130A (ko) * 2003-03-26 2004-10-06 상익건설주식회사 재생 골재를 포함하는 콘크리트조성물 및 상기콘크리트조성물에 의해 제조되는 인공어초
US7448825B2 (en) 2004-12-03 2008-11-11 Green Arm Co., Ltd. Method for continuous on-site recycling of an asphalt mixture layer of a pavement and a motor-driven vehicle system therefor

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB277216A (en) * 1926-10-29 1927-09-15 Trinidad Improved manufacture of coatings for roadways
FR2408691A1 (fr) * 1977-11-10 1979-06-08 Costa Alain Engin automobile recuperateur de gravillons ou similaires
NL8104452A (nl) * 1981-09-29 1983-04-18 Johannes Hendrikus Josephus Vo Werkwijze en inrichting voor het terugwinnen van zand-en steenfracties uit hoeveelheden van bouw- of sloopafval.
DE3248493A1 (de) * 1982-12-29 1984-07-12 Lindemann Maschinenfabrik GmbH, 4000 Düsseldorf Verfahren zum rueckgewinnen von wertstoffen aus mischabfaellen der bauwirtschaft und anlage zum durchfuehren des verfahrens
DE3824710A1 (de) * 1988-07-20 1990-01-25 Edelhoff Polytechnik Verfahren und vorrichtung zum reinigen von mit koernigem material bestreuten boeden von staub und schmutz
US5762780A (en) * 1994-12-15 1998-06-09 Solv-Ex Corporation Method and apparatus for removing bituminous oil from oil sands without solvent
DE19617501A1 (de) * 1996-05-03 1997-11-06 Akw Apparate Verfahren Verfahren zur Trennung der Bestandteile von kommunalen Reststoffen, sowie Anordnung insbesondere zur Durchführung dieses Verfahrens
JP2000263026A (ja) 1999-03-19 2000-09-26 Nippon Kosan Kk コンクリートガラの再資源化方法
KR20040084130A (ko) * 2003-03-26 2004-10-06 상익건설주식회사 재생 골재를 포함하는 콘크리트조성물 및 상기콘크리트조성물에 의해 제조되는 인공어초
US7448825B2 (en) 2004-12-03 2008-11-11 Green Arm Co., Ltd. Method for continuous on-site recycling of an asphalt mixture layer of a pavement and a motor-driven vehicle system therefor

Similar Documents

Publication Publication Date Title
KR100697250B1 (ko) 건설폐기물 선별장치
US8517177B2 (en) Systems and methods for recovering materials from soil
US5405440A (en) Process for the preparation of a cold mix asphalt paving composition
US20200206980A1 (en) Method recycling a roll of artificial turf
CN103848584B (zh) 一种建筑垃圾资源化再生微粉、细砂联合生产工艺方法
CN106378249A (zh) 一种建筑废弃物两次砖混分离工艺
JP2009125610A (ja) 汚染土壌の浄化方法
EP2400058A1 (de) Recycling von Sand
DE4442631C2 (de) Verfahren und Anlage zur Aufbereitung der in Shredderanlagen anfallenden Leichtfraktion
JP3245549B2 (ja) 埋め戻し材用砂の製造方法
EP2052780B1 (de) Verfahren zur Schlackenaufbereitung
EP3541996B1 (de) Verfahren und system zur verarbeitung einer asphaltfahrbahn für recyclingzwecke und verwendung von durch solch ein verfahren erhaltenen briketts
JP2007175585A (ja) 汚染土壌の処理方法
EP2096211B1 (de) Entsorgungssystem für Kunstgras oder ähnliche Flächen
DE4034227C2 (de)
CA2439497A1 (en) Shingle processing
JP3822819B2 (ja) 舗装用結合材、舗装用合材及び舗装
JP2538484B2 (ja) コンクリ―ト及びアスファルト廃棄物からの骨材の調製法
KR200284248Y1 (ko) 건설폐기물의 풍력 선별 원통스크린 장치
EP0482269A1 (de) Verfahren und Vorrichtung zum Aufbereiten von Ablagerungen
JPH04114780A (ja) コンクリート廃棄物の再処理方法と装置
KR100632787B1 (ko) 폐 아스콘 재생방법
JP3044592U (ja) コンクリート廃材、アスファルト廃材からの再生砂製造装置
RU2463160C2 (ru) Способ и установка для переработки пластмассовых отходов, бедных металлами
TWI554339B (zh) 土壤之淨化方法

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME RS

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120529

17Q First examination report despatched

Effective date: 20121005

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20130216