WO1998004648A1 - Method of treatment of fluid material - Google Patents

Method of treatment of fluid material Download PDF

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Publication number
WO1998004648A1
WO1998004648A1 PCT/AU1997/000475 AU9700475W WO9804648A1 WO 1998004648 A1 WO1998004648 A1 WO 1998004648A1 AU 9700475 W AU9700475 W AU 9700475W WO 9804648 A1 WO9804648 A1 WO 9804648A1
Authority
WO
WIPO (PCT)
Prior art keywords
agent
fluid
fluid substance
silicate solution
sprayed onto
Prior art date
Application number
PCT/AU1997/000475
Other languages
French (fr)
Inventor
Brian Cutler
Original Assignee
Notwheat Pty. Ltd.
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 Notwheat Pty. Ltd. filed Critical Notwheat Pty. Ltd.
Priority to AU35329/97A priority Critical patent/AU732566B2/en
Publication of WO1998004648A1 publication Critical patent/WO1998004648A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically

Definitions

  • the present invention relates to a treatment of a fluid material for the purpose of preventing contamination.
  • fluid material shall be taken to include viscous slurries and particulate material which may be both dry or moist irrespective of whether they have the capacity to flow as a true fluid.
  • Fluid materials as described above in the form of contaminated soil, mine tailings or other industrial waste are a danger to the environment because of the leaching of toxic substances by water into the surrounding environment.
  • the invention resides in a method of treating fluid substances introducing into a fluid substance a first agent comprising a water soluble calcium salt and allowing the first agent to dissolve and/or become substantially uniformly distributed throughout the fluid and then subsequently applying a second agent in the form of a silicate solution.
  • the first agent comprises calcium acetate.
  • the calcium acetate is applied as an aqueous solution.
  • the calcium acetate is applied in solid form.
  • the calcium acetate is applied in the form of porous particles.
  • the invention resides in a substantially waterproof product from the method as described above for the first aspect of the invention.
  • the first embodiment comprises the treatment of contaminated soil, mine tailings or other industrial waste.
  • the contaminated material is carried by a conveyor past a first spray station at which a calcium ion solution is sprayed onto the material. Subsequently the conveying system causes the material to be intermixed to ensure a substantially uniform distribution of the solution into the mixture. The material is then caused to pass a second spraying station at which a silicate solution is applied to the material. Subsequent to that spraying action the mixture is again caused to be mixed such that the silicate solution becomes evenly distributed throughout the material.
  • the calcium ion solution of the embodiment comprises a calcium acetate solution while the silicate solution comprises a sodium silicate solution.
  • a suitable wetting agent may be applied to both solutions to ensure substantial distribution of the respective solutions through the material.
  • the material may be caused to pass through a pelletising plant or like installation which will serve to compress and form the treated material into discrete elements such as pellets briquettes and the like.
  • the calcium acetate is applied in a powder form or in the form of porous particles of calcium acetate.
  • each of the embodiments is to render the resultant pellets and briquettes substantially waterproof and whereby they are substantially impervious to the penetration of any water. This will serve to effectively seal the contaminants contained within the pellets or briquettes from any leaching action by water. Once having been pelletised the materials can then be disposed of at a suitable storage site.
  • the material to be treated may be conveyed through a conduit or passage and the first and second agents are introduced into the material as it passes along the passage at spaced locations along the conduit or passage.
  • the conduit or passage can be provided with means which will cause the material to become intimately mixed with the respective agent subsequent to its introduction.
  • One particular form of the embodiment comprises a passageway having an auger coaxially received through it and where the auger is caused to rotate within the passageway to effect the required mixing.
  • the resultant mixture can be deposited at a desired location and then compacted to form a substantially water impervious mass.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention relates to a method of treating fluid substances comprising introducing into the fluid substance a first agent comprising a water soluble calcium salt and allowing that agent to dissolve and/or become substantially uniformly distributed throughout the fluid and then subsequently applying a second agent in the form of a silicate solution.

Description

Title
METHOD OF TREATMENT OF FLUID MATERIAL
Technical field
The present invention relates to a treatment of a fluid material for the purpose of preventing contamination.
Background of the invention
Throughout the specification the term fluid material shall be taken to include viscous slurries and particulate material which may be both dry or moist irrespective of whether they have the capacity to flow as a true fluid.
Fluid materials as described above in the form of contaminated soil, mine tailings or other industrial waste are a danger to the environment because of the leaching of toxic substances by water into the surrounding environment.
It is an object of this invention to provide a means whereby fluid materials of the form described above which may contain toxic or dangerous substances can be rendered substantially unavailable for leaching.
Summary of the invention
According to a first aspect, the invention resides in a method of treating fluid substances introducing into a fluid substance a first agent comprising a water soluble calcium salt and allowing the first agent to dissolve and/or become substantially uniformly distributed throughout the fluid and then subsequently applying a second agent in the form of a silicate solution.
According to a preferred feature of the invention the first agent comprises calcium acetate. In one embodiment the calcium acetate is applied as an aqueous solution. In another embodiment the calcium acetate is applied in solid form. In another embodiment the calcium acetate is applied in the form of porous particles.
According to a second aspect, the invention resides in a substantially waterproof product from the method as described above for the first aspect of the invention.
Description of preferred embodiments
The invention will be more fully understood in the light of the following description of several specific embodiments.
The first embodiment comprises the treatment of contaminated soil, mine tailings or other industrial waste.
According to the first embodiment the contaminated material is carried by a conveyor past a first spray station at which a calcium ion solution is sprayed onto the material. Subsequently the conveying system causes the material to be intermixed to ensure a substantially uniform distribution of the solution into the mixture. The material is then caused to pass a second spraying station at which a silicate solution is applied to the material. Subsequent to that spraying action the mixture is again caused to be mixed such that the silicate solution becomes evenly distributed throughout the material.
The calcium ion solution of the embodiment comprises a calcium acetate solution while the silicate solution comprises a sodium silicate solution. If desired a suitable wetting agent may be applied to both solutions to ensure substantial distribution of the respective solutions through the material. Once the material has passed the second spraying station and adequate mixing has taken place the material may be caused to pass through a pelletising plant or like installation which will serve to compress and form the treated material into discrete elements such as pellets briquettes and the like. According to a second embodiment the calcium acetate is applied in a powder form or in the form of porous particles of calcium acetate.
The effect of each of the embodiments is to render the resultant pellets and briquettes substantially waterproof and whereby they are substantially impervious to the penetration of any water. This will serve to effectively seal the contaminants contained within the pellets or briquettes from any leaching action by water. Once having been pelletised the materials can then be disposed of at a suitable storage site.
According to an alternative embodiment the material to be treated may be conveyed through a conduit or passage and the first and second agents are introduced into the material as it passes along the passage at spaced locations along the conduit or passage. The conduit or passage can be provided with means which will cause the material to become intimately mixed with the respective agent subsequent to its introduction. One particular form of the embodiment comprises a passageway having an auger coaxially received through it and where the auger is caused to rotate within the passageway to effect the required mixing.
In the case of each of the embodiments rather than being pelletised or formed into briquettes, the resultant mixture can be deposited at a desired location and then compacted to form a substantially water impervious mass.
It should be appreciated that the scope of the present invention need not be limited to the particular scope of the embodiments described above.

Claims

Claims
1. A method of treating fluid substances including introducing into a fluid substance a first agent comprising a water soluble calcium salt and allowing the first agent to dissolve or become substantially uniformly distributed throughout the fluid and then subsequently applying a second agent in the form of a silicate solution.
2. A method according to claim 1 , wherein the water soluble calcium salt is calcium acetate.
3. A method according to claim 2, wherein the silicate solution is a sodium silicate solution.
4. A method according to claim 2, wherein the calcium acetate is in a form of porous particles.
5. A method according to any one of claims 1 to 4 wherein the first agent comprising a water soluble calcium salt is sprayed onto the fluid substance.
6. A method according to claims 1 to 5 wherein the second agent in the form of a silicate solution is sprayed onto the fluid substance.
7. A method according to claim 5 wherein after the first agent is sprayed onto the fluid substance, an intermixing means is provided which will substantially distribute the first agent throughout the fluid substance.
8. A method according to claim 6 wherein after the second agent is sprayed onto the fluid substance, an intermixing means is provided which will substantially distribute the second agent throughout the fluid substance.
9. A method according to either of claims 7 or 8, wherein the intermixing means is an auger coaxially received within a conduit.
10. A method according to claim 1, wherein the calcium acetate is introduced into the fluid substance in a powder form.
11. A method according to claim 1 , wherein the fluid substance is sprayed on a conveyor provided with a first and a second spray station.
12. A method according to claim 11 , wherein after the fluid material has passed the second spray station, the material is formed into a pellet or briquette.
13. A substantially waterproof product made from the method as described in any one of claims 1 to 12.
PCT/AU1997/000475 1996-07-25 1997-07-25 Method of treatment of fluid material WO1998004648A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35329/97A AU732566B2 (en) 1996-07-25 1997-07-25 Method of treatment of fluid material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO1242A AUPO124296A0 (en) 1996-07-25 1996-07-25 Method of treatment of fluid material
AUP01242 1996-07-25

Publications (1)

Publication Number Publication Date
WO1998004648A1 true WO1998004648A1 (en) 1998-02-05

Family

ID=3795557

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1997/000475 WO1998004648A1 (en) 1996-07-25 1997-07-25 Method of treatment of fluid material

Country Status (2)

Country Link
AU (1) AUPO124296A0 (en)
WO (1) WO1998004648A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2086402A (en) * 1980-10-25 1982-05-12 Foseco Int Gel forming compositions
GB2124276A (en) * 1982-06-11 1984-02-15 Soletanche Sealing and/or consolidation agent and method of using it
EP0556525A1 (en) * 1992-01-17 1993-08-25 SOCIETE FRANCAISE HOECHST Société anonyme dite: Aqueous sodium silicate compositions, method of distribution and application for consolidating soil
JPH0663594A (en) * 1992-08-24 1994-03-08 Okuda Toshiyuki Treatment of industrial waste containing pcb
WO1994006884A1 (en) * 1992-09-11 1994-03-31 Chemical Lime Company Method for stabilizing clay bearing soils by addition of silica and lime
JPH0770562A (en) * 1993-09-03 1995-03-14 Mitsui Toatsu Chem Inc Grout for solidifying ground
JPH0824900A (en) * 1994-07-15 1996-01-30 Kouyuu Kk Waste water and sludge treatment agent, and treatment of waste water and sludge using the agent

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2086402A (en) * 1980-10-25 1982-05-12 Foseco Int Gel forming compositions
GB2124276A (en) * 1982-06-11 1984-02-15 Soletanche Sealing and/or consolidation agent and method of using it
EP0556525A1 (en) * 1992-01-17 1993-08-25 SOCIETE FRANCAISE HOECHST Société anonyme dite: Aqueous sodium silicate compositions, method of distribution and application for consolidating soil
JPH0663594A (en) * 1992-08-24 1994-03-08 Okuda Toshiyuki Treatment of industrial waste containing pcb
WO1994006884A1 (en) * 1992-09-11 1994-03-31 Chemical Lime Company Method for stabilizing clay bearing soils by addition of silica and lime
JPH0770562A (en) * 1993-09-03 1995-03-14 Mitsui Toatsu Chem Inc Grout for solidifying ground
JPH0824900A (en) * 1994-07-15 1996-01-30 Kouyuu Kk Waste water and sludge treatment agent, and treatment of waste water and sludge using the agent

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. 12521E/07, Class D15, M14, P43; & JP,A,57 001 481 (EBARA INFILCO KK), 6 January 1982. *
DERWENT ABSTRACT, Accession No. 83-773252/39, Class L02; & JP,A,58 138 778 (TAGUCHI Y), 17 August 1983. *
DERWENT ABSTRACT, Accession No. 92-290252/35, Class P43; & JP,A,04 200 680 (HITACHI LTD), 21 July 1992. *

Also Published As

Publication number Publication date
AUPO124296A0 (en) 1996-08-15

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