WO2000066681A1 - Soil conditioning agent and method of manufacture of a soil conditioning agent - Google Patents

Soil conditioning agent and method of manufacture of a soil conditioning agent Download PDF

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Publication number
WO2000066681A1
WO2000066681A1 PCT/AU2000/000396 AU0000396W WO0066681A1 WO 2000066681 A1 WO2000066681 A1 WO 2000066681A1 AU 0000396 W AU0000396 W AU 0000396W WO 0066681 A1 WO0066681 A1 WO 0066681A1
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WO
WIPO (PCT)
Prior art keywords
conditioning agent
soil conditioning
slurry
liquid
soil
Prior art date
Application number
PCT/AU2000/000396
Other languages
French (fr)
Inventor
Phillip Francis Thorpe
Original Assignee
Thorpe, Beryl, Ann
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
Priority claimed from AUPQ0133A external-priority patent/AUPQ013399A0/en
Priority claimed from AUPQ0218A external-priority patent/AUPQ021899A0/en
Priority claimed from AUPQ3254A external-priority patent/AUPQ325499A0/en
Application filed by Thorpe, Beryl, Ann filed Critical Thorpe, Beryl, Ann
Priority to AU40933/00A priority Critical patent/AU756459B2/en
Publication of WO2000066681A1 publication Critical patent/WO2000066681A1/en

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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
    • C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
    • C09K17/10—Cements, e.g. Portland cement
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00—Calcareous fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/80—Soil conditioners

Definitions

  • This invention relates to a method of manufacture of a soil conditioning agent and the soil conditioning agent produced by that method.
  • the invention resides in a method of forming a soil conditioning agent comprising washing an unset concrete composition by adding water thereto to form a slurry which is unable to set where the resultant slurry comprises the soil conditioning agent.
  • the aggregate is separated from the resultant slurry.
  • the resultant slurry is allowed to settle to settle, the liquid is separated from the settled solids wherein the said decanted liquid and the settled solids comprise the soil conditioning agent.
  • the large aggregate is separated from the slurry before the slurry is allowed to settle.
  • the liquid is separated from the settled solids shortly after the slurry is initially allowed to settle.
  • the separated liquid is permitted to settle to allow for at least some of the finely suspended solids to settle and the settled finely suspended solids are separated from the liquid.
  • the large aggregate is separated from the slurry before the slurry is allowed to settle.
  • the soil conditioning agent resides in a slurry of watered down concrete which is unable to set.
  • the aggregate has been removed from the slurry
  • the soil conditioning agent resides in the settled solids which are obtained from unset concrete according to the method as described above.
  • the invention resides in the separated liquid which is obtained from unset concrete according to the method as described above.
  • the invention resides in the settled finely suspended solids which is obtained from unset concrete according to the method as described above.
  • the invention resides in a method of treating soil by applying a solid and/or liquid soil conditioning agent which has been formed according to the method described above.
  • the embodiments relate to the formation of a soil conditioning agent from an unset concrete composition.
  • the residual concrete in the vehicles is washed from the vehicle and delivered into a roller screen whereby most of the aggregate material is separated from the slurry passing from the vehicle.
  • the separated aggregate is collected for reuse either in fresh concrete or elsewhere.
  • the resultant screened slurry is then allowed to pass from the screen and is collected in a sump where the solids in the slurry are allowed to settle.
  • the water is decanted or drained from the sump to leave the settled solids.
  • the settled solids are then extracted from the sump and are further dewatered.
  • This dewatering may comprise forming the settled solids into a heap and allowing for the natural drainage of the water from the heaped material.
  • the resultant material can serve as a soil conditioning agent which can be utilised to adjust the pH of acidic soils.
  • the resultant material carries a significant quantity of trace elements which serve to further enhance the quality of the soil to which it is applied.
  • the method of the embodiment was applied to waste concrete which had been manufactured at a batching plant in Capel, Western Australia and which was formed from an aggregate formed from a basalt rock which was derived from the Gelorup quarry.
  • the concrete contained sand which had been obtained locally.
  • the application of the method was found to produce a soil conditioning agent having a pH of 12 and having the following constituents:
  • the soil conditioning agent according to the first embodiment can be applied directly to the soil.
  • the solid soil conditioning agent can be mixed with a fertiliser prior to the application to the soil.
  • the solid soil conditioning agent can be incorporated into a fertiliser to be applied jointly with the fertiliser to the soil.
  • the liquid suspension which in the case of the first embodiment is decanted or drained from the sump subsequent to settling can be used as a soil conditioning agent in the light of it's alkalinity and the presence of it's dissolved contents. It is anticipated that the separated liquid can be sprayed directly onto the soil to reduce the soil's acidity and otherwise improve the soil.
  • the separated liquid of the second embodiment comprises liquid suspension of fine particulate material.
  • the liqluid suspension is allowed to settle to permit a substantial portion of the fine particulate material to settle.
  • the liquid is then separated from the settled fine particulate material and both the liquid and the settled fine particulate material is used separately as a soil conditioning agent.
  • the decanted or drained liquid which was separated in the example of the first embodiment described above produced a separated liquid suspension which if allowed to fully settle resulted in a liquid portion and a sediment portion which both had a pH of 12.
  • the liquid portion had the following constituents;
  • the decanted liquid suspension provides a valuable means of conditioning soil in that it can be used to improve the pH of acidic soils as well as a source of certain trace elements.
  • the sediment can be used as a soil conditioning agent.
  • the aggregate is not separated from the slurry prior to settling in case of the first second and third embodiments respectively .
  • the waste concrete is washed from the vehicle and if desired the resultant slurry is further diluted to produce a concrete slurry which is unable to set to form a solid and the resultant the slurry is used as a soil conditioning agent.
  • the concrete slurry as a soil conditioning agent it may be necessary to provide a means of agitating the slurry to keep the solid constituents in suspension, at least during the application phase.
  • the aggregate is separated from the concrete slurry before the slurry is used as a soil conditioning agent.
  • the concrete slurry as a soil conditioning agent it may be necessary to provide a means of agitating the slurry to keep the solid constituents in suspension, at least during the application phase.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Pest Control & Pesticides (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

A method of forming a soil conditioning agent comprising washing an unset concrete composition by adding water thereto to form a slurry which is unable to set where the resultant slurry comprises the soil conditioning agent and/or can be separated into a liquid phase and at least on solid phase which can each comprise the soil conditioning agent.

Description

Title: Soil Conditioning Agent and Method of Manufacturing of a Soil Conditioning Agent
Field of the Invention
This invention relates to a method of manufacture of a soil conditioning agent and the soil conditioning agent produced by that method.
Disclosure of the Invention
Accordingly the invention resides in a method of forming a soil conditioning agent comprising washing an unset concrete composition by adding water thereto to form a slurry which is unable to set where the resultant slurry comprises the soil conditioning agent.
According to a preferred feature of the invention the aggregate is separated from the resultant slurry.
According to a preferred feature of the invention the resultant slurry is allowed to settle to settle, the liquid is separated from the settled solids wherein the said decanted liquid and the settled solids comprise the soil conditioning agent. According to a further preferred feature the large aggregate is separated from the slurry before the slurry is allowed to settle.
According to a preferred feature of the invention the liquid is separated from the settled solids shortly after the slurry is initially allowed to settle. According to a preferred embodiment the separated liquid is permitted to settle to allow for at least some of the finely suspended solids to settle and the settled finely suspended solids are separated from the liquid. According to a further preferred feature the large aggregate is separated from the slurry before the slurry is allowed to settle. Accordingly, in another aspect of the invention the soil conditioning agent resides in a slurry of watered down concrete which is unable to set. According to a preferred feature the aggregate has been removed from the slurry
Accordingly, in another aspect of the invention the soil conditioning agent resides in the settled solids which are obtained from unset concrete according to the method as described above.
Accordingly, in another aspect the invention resides in the separated liquid which is obtained from unset concrete according to the method as described above.
Accordingly, in another aspect the invention resides in the settled finely suspended solids which is obtained from unset concrete according to the method as described above.
Accordingly, in another aspect the invention resides in a method of treating soil by applying a solid and/or liquid soil conditioning agent which has been formed according to the method described above.
Description of Specific Embodiments
The invention will be more fully understood in the light of the following description of several specific embodiments.
The embodiments relate to the formation of a soil conditioning agent from an unset concrete composition.
It has been found that in concrete batching plants, in which concrete is formed to be delivered to a site by vehicles, it is not an uncommon circumstance for those delivery vehicles to return to the batching plant with some residual concrete remaining in the vehicle. In the past, it has been usual practice to merely wash the residual concrete from the vehicle and deposit the resultant slurry into a waste sump, allow the water to drain from the slurry and then break up the resultant solid material resident in the sump in order that the resultant solid material can be used as road base. According to alternative proposals the waste concrete is washed from the vehicle, the aggregate and sand is separated from the slurry for use in making fresh concrete or as road base and the resultant liquid is used for the production of fresh concrete.
According to the first embodiment, the residual concrete in the vehicles is washed from the vehicle and delivered into a roller screen whereby most of the aggregate material is separated from the slurry passing from the vehicle. The separated aggregate is collected for reuse either in fresh concrete or elsewhere. The resultant screened slurry is then allowed to pass from the screen and is collected in a sump where the solids in the slurry are allowed to settle. After a period of time which is sufficient to allow for the adequate settlement of the solids, the water is decanted or drained from the sump to leave the settled solids. The settled solids are then extracted from the sump and are further dewatered. This dewatering may comprise forming the settled solids into a heap and allowing for the natural drainage of the water from the heaped material.
It has been found that the resultant material can serve as a soil conditioning agent which can be utilised to adjust the pH of acidic soils. In addition, it has been found that the resultant material carries a significant quantity of trace elements which serve to further enhance the quality of the soil to which it is applied.
According to one example of the invention, the method of the embodiment was applied to waste concrete which had been manufactured at a batching plant in Capel, Western Australia and which was formed from an aggregate formed from a basalt rock which was derived from the Gelorup quarry. In addition the concrete contained sand which had been obtained locally. The application of the method was found to produce a soil conditioning agent having a pH of 12 and having the following constituents:
Figure imgf000006_0001
It is believed that use of the soil conditioning agent derived from the example referred to above, acidic soils (which may be either naturally occurring or which have been acidified as a result of the repetitive application of fertilisers to the soil) can be improved significantly.
It is anticipated that the soil conditioning agent according to the first embodiment can be applied directly to the soil. Alternatively, the solid soil conditioning agent can be mixed with a fertiliser prior to the application to the soil. Alternatively, the solid soil conditioning agent can be incorporated into a fertiliser to be applied jointly with the fertiliser to the soil.
According to a second embodiment of the invention the liquid suspension which in the case of the first embodiment is decanted or drained from the sump subsequent to settling can be used as a soil conditioning agent in the light of it's alkalinity and the presence of it's dissolved contents. It is anticipated that the separated liquid can be sprayed directly onto the soil to reduce the soil's acidity and otherwise improve the soil.
According to a third embodiment of the invention the separated liquid of the second embodiment comprises liquid suspension of fine particulate material. In the case of the third embodiment the liqluid suspension is allowed to settle to permit a substantial portion of the fine particulate material to settle. The liquid is then separated from the settled fine particulate material and both the liquid and the settled fine particulate material is used separately as a soil conditioning agent.
According to an example of the third embodiment the decanted or drained liquid which was separated in the example of the first embodiment described above produced a separated liquid suspension which if allowed to fully settle resulted in a liquid portion and a sediment portion which both had a pH of 12. The liquid portion had the following constituents;
Figure imgf000007_0001
while the sediment portion had the following constituents:
Figure imgf000008_0001
Therefore the decanted liquid suspension provides a valuable means of conditioning soil in that it can be used to improve the pH of acidic soils as well as a source of certain trace elements. In addition the sediment can be used as a soil conditioning agent.
According to a fourth, fifth and sixth embodiment of the invention, the aggregate is not separated from the slurry prior to settling in case of the first second and third embodiments respectively .
According to a seventh embodiment of the invention the waste concrete is washed from the vehicle and if desired the resultant slurry is further diluted to produce a concrete slurry which is unable to set to form a solid and the resultant the slurry is used as a soil conditioning agent. In use of the concrete slurry as a soil conditioning agent it may be necessary to provide a means of agitating the slurry to keep the solid constituents in suspension, at least during the application phase.
According to a eighth embodiment which is a variation of the seventh embodiment the aggregate is separated from the concrete slurry before the slurry is used as a soil conditioning agent. In use of the concrete slurry as a soil conditioning agent it may be necessary to provide a means of agitating the slurry to keep the solid constituents in suspension, at least during the application phase.
Throughout the specification, unless the context requires otherwise, the word "comprise" or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
It should be appreciated that the scope of the present invention need not be limited to the particular scope of the embodiment described above.

Claims

The claims defining the invention are as follows:
1. A method of forming a soil conditioning agent comprising washing an unset concrete composition by adding water thereto to form a slurry which is unable to set where the resultant slurry comprises the soil conditioning agent.
2. A method of forming a soil conditioning agent as claimed at claim 1 wherein the aggregate is separated from the resultant slurry.
3. A method of forming a soil conditioning agent as claimed at claim 1 or 2 wherein the resultant slurry is allowed to settle to settle, the liquid is separated from the settled solids wherein the said decanted liquid and the settled solids comprise the soil conditioning agent.
4. A method of forming a soil conditioning agent as claimed at claim 3 wherein the large aggregate is separated from the slurry before the slurry is allowed to settle.
5. A method of forming a soil conditioning agent as claimed at claim 3 or 4 wherein the liquid is separated from the settled solids shortly after the slurry is initially allowed to settle.
6. A method of forming a soil conditioning agent as claimed at claim 5 wherein the separated liquid is permitted to settle to allow for at least some of the finely suspended solids to settle and the settled finely suspended solids are separated from the liquid and the finely settled solids and/or the resultant liquid comprise the soil conditioning agent.
7. A method of forming a soil conditioning agent as claimed at claim 1 or 2 wherein the soil conditioning agent resides in a slurry of watered down concrete which is unable to set.
8. A method of forming a soil conditioning agent substantially as herein described.
9. A the soil conditioning agent comprising the settled solids which are obtained from unset concrete according to the method as claimed at any one of claims 3 to 8.
10. A the soil conditioning agent comprising the separated liquid which is obtained from unset concrete according to the method as claimed at any one of claims 3 to 8.
11. A the soil conditioning agent comprising the settled finely suspended solids which is obtained from unset concrete according to the method as claimed at claim 6.
12. A the soil conditioning agent comprising the resultant liquid which is obtained from unset concrete according to the method as claimed at claim 6.
13. A the soil conditioning agent which is obtained from unset concrete according to the method as claimed at claim 7.
14. A soil conditioning agent substantially as herein described.
15. A method of treating soil by applying a solid and/or liquid soil conditioning agent of the form as claimed at any one of claims 9 to 14.
PCT/AU2000/000396 1999-05-03 2000-05-01 Soil conditioning agent and method of manufacture of a soil conditioning agent WO2000066681A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40933/00A AU756459B2 (en) 1999-05-03 2000-05-01 Soil conditioning agent and method of manufacture of a soil conditioning agent

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AUPQ0133 1999-05-03
AUPQ0133A AUPQ013399A0 (en) 1999-05-03 1999-05-03 Soil conditioning agent and method of manufacture of a soil conditioning agent
AUPQ0218 1999-05-05
AUPQ0218A AUPQ021899A0 (en) 1999-05-05 1999-05-05 Soil conditioning agent and method of manufacture of a soil conditioning agent (case b)
AUPQ3254A AUPQ325499A0 (en) 1999-09-30 1999-09-30 Soil conditioning agent and method of manufacture of a soil conditioning agent
AUPQ3254 1999-09-30

Publications (1)

Publication Number Publication Date
WO2000066681A1 true WO2000066681A1 (en) 2000-11-09

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01313588A (en) * 1988-06-11 1989-12-19 Mitsubishi Mining & Cement Co Ltd Granular soil conditioner and manufacture thereof
JPH03260201A (en) * 1990-03-09 1991-11-20 Teruo Mori Modifier for humid muddy roadbed
JPH07315971A (en) * 1994-05-24 1995-12-05 Mitsubishi Materials Corp Production of calcium silicate fertilizer
JPH08173758A (en) * 1994-12-22 1996-07-09 Neotec:Kk Method for reuse of wash residue of ready-mixed concrete and its apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01313588A (en) * 1988-06-11 1989-12-19 Mitsubishi Mining & Cement Co Ltd Granular soil conditioner and manufacture thereof
JPH03260201A (en) * 1990-03-09 1991-11-20 Teruo Mori Modifier for humid muddy roadbed
JPH07315971A (en) * 1994-05-24 1995-12-05 Mitsubishi Materials Corp Production of calcium silicate fertilizer
JPH08173758A (en) * 1994-12-22 1996-07-09 Neotec:Kk Method for reuse of wash residue of ready-mixed concrete and its apparatus

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class C03, AN 1990-034467/03 *
DATABASE WPI Derwent World Patents Index; Class C04, AN 1996-055837/06 *
DATABASE WPI Derwent World Patents Index; Class J02, AN 1996-366102/37 *
DATABASE WPI Derwent World Patents Index; Class P43, AN 1992-011594/02 *
PATENT ABSTRACTS OF JAPAN *

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