GB2159143A - Lightweight aggregate - Google Patents

Lightweight aggregate Download PDF

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Publication number
GB2159143A
GB2159143A GB08409467A GB8409467A GB2159143A GB 2159143 A GB2159143 A GB 2159143A GB 08409467 A GB08409467 A GB 08409467A GB 8409467 A GB8409467 A GB 8409467A GB 2159143 A GB2159143 A GB 2159143A
Authority
GB
United Kingdom
Prior art keywords
siliceous material
lime
particles
pellets
granules
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.)
Granted
Application number
GB08409467A
Other versions
GB8409467D0 (en
GB2159143B (en
Inventor
Bryan James Walker
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.)
Granulite Ltd
Original Assignee
Granulite 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 Granulite Ltd filed Critical Granulite Ltd
Priority to GB08409467A priority Critical patent/GB2159143B/en
Publication of GB8409467D0 publication Critical patent/GB8409467D0/en
Publication of GB2159143A publication Critical patent/GB2159143A/en
Application granted granted Critical
Publication of GB2159143B publication Critical patent/GB2159143B/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight materials

Abstract

Lightweight aggregate for use in the building industry is produced by pelletising or granulating pulverised fuel ash or other siliceous material with a binder comprising comminuted lime in an amount less than 5% by weight based on the weight of the mixture of lime and siliceous material and curing the pellets or granules at a temperature within the range of from 35 DEG C to 100 DEG C in an atmosphere saturated with water vapour. The lime must be comminuted and may be mixed with a part of the siliceous material and comminuted by impact with the particles of siliceous materials before being mixed with the remainder thereof.

Description

SPECIFICATION Method of making building materials Patent Application No: 8228182 relates to a method of making a lightweight aggregate for use in the building industry which comprises blending a siliceous material with a binder comprising quick lime and/or hydrated lime in an amount less than 5% (calculated as CaO) based on the total dry weight of siliceous material and binder, forming the blend into granules or pellets, if necessary or desired with the addition of water, and curing or hardening the pellets or granules by maintaining them at a temperature within the range of from 35"C to 1000C in an atmosphere saturated with water vapour.
This invention is based on the observation that greatly improved pellets, which improvement may comprise reduction in the amount of added lime for a given strength or improved strength for a given curing time, can be obtained if the lime and/ or at least a part of the siliceous material is comminuted before being formed into pellets or granules.
The siliceous material is preferably pulverised fly ash, although other natural or synethic pozzolans can be used. Moreover, a natural or synethetic pozzolan may be used in admixture with other siliceous material such as sand.
Since lime per se because of its physical nature is extremely difficult to comminute the lime is preferably mixed with a part of the siliceous material and comminuted by impacting the particles of lime with the particles of siliceous material, which normally will also result in at least partial break up of the particles of siliceous material, and the lime and said part of the siliceous material is then added to the bulk of the siliceous material and admixed therewith.
Where the siliceous material is pulverised fly ash, all or a part of the pulverised fly ash is preferably also pre-ground at least partially to break up the spherulitic structure and to expose the more reactive surface inside the nearly spherical particles.
The comminution of the lime and/or the siliceous material may be effected by impacting the particles against each other or against another surface. For example, a mixture of lime and siliceous material may be placed in a ball mill so that the particles of siliceous material crush the lime particles and themselves or a mixture of lime and siliceous material or siliceous material alone may be injected into a chamber where impact of the particles against the walls of the chamber or against each other cause comminution of the particles.
As mentioned above, comminution of the siliceous material increases the surface area of particles available for reaction with the lime, and/or exposes a more reactive surface of the particles.
Comminution of the lime increases the rate of solubility and therefore enables it to enter into reaction more quickly. Both these factors allow the reaction to proceed more quickly, or more completely, thereby resulting in a great improvement in the process and the pellets or granules obtained thereby.
1. A process for the manufacture of lightweight aggregate for use in the building industry which comprises blending a siliceous material with a binder comprising quick lime and/or hydrated lime in an amount less than 5% (calculated as CaO) based on the total dry weight of siliceous material and binder, forming the blend into granules or pellets, if necessary or desired with the addition of water, and curing or hardening the pellets or granules by maintaining them at a temperature within the range of from 35"C to 100"C in an atmosphere saturated with water vapour, wherein at least the lime is comminuted prior to being formed into granules or pellets.
2. A process according to Claim 1, wherein the lime is mixed with a part of the siliceous material and is comminuted by impact with the particles of siliceous material and the lime and said part of the siliceous material is then added to the bulk of the siliceous material and admixed therewith.
3. A process according to Claim 1 or Claim 2, wherein the siliceous material is pulverised flyash and at least a part thereof is comminuted to break up the spherulitic structure and expose the internal surface of the particles.
4. A process according to any one of Claims 1 to 3 wherein the lime and/or siliceous material is comminuted by ball milling or by impact with the walls of a chamber into which they are injected.
5. A lightweight aggregate wherever produced by a process according to any one of Claims 1 to 4.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of making building materials Patent Application No: 8228182 relates to a method of making a lightweight aggregate for use in the building industry which comprises blending a siliceous material with a binder comprising quick lime and/or hydrated lime in an amount less than 5% (calculated as CaO) based on the total dry weight of siliceous material and binder, forming the blend into granules or pellets, if necessary or desired with the addition of water, and curing or hardening the pellets or granules by maintaining them at a temperature within the range of from 35"C to 1000C in an atmosphere saturated with water vapour. This invention is based on the observation that greatly improved pellets, which improvement may comprise reduction in the amount of added lime for a given strength or improved strength for a given curing time, can be obtained if the lime and/ or at least a part of the siliceous material is comminuted before being formed into pellets or granules. The siliceous material is preferably pulverised fly ash, although other natural or synethic pozzolans can be used. Moreover, a natural or synethetic pozzolan may be used in admixture with other siliceous material such as sand. Since lime per se because of its physical nature is extremely difficult to comminute the lime is preferably mixed with a part of the siliceous material and comminuted by impacting the particles of lime with the particles of siliceous material, which normally will also result in at least partial break up of the particles of siliceous material, and the lime and said part of the siliceous material is then added to the bulk of the siliceous material and admixed therewith. Where the siliceous material is pulverised fly ash, all or a part of the pulverised fly ash is preferably also pre-ground at least partially to break up the spherulitic structure and to expose the more reactive surface inside the nearly spherical particles. The comminution of the lime and/or the siliceous material may be effected by impacting the particles against each other or against another surface. For example, a mixture of lime and siliceous material may be placed in a ball mill so that the particles of siliceous material crush the lime particles and themselves or a mixture of lime and siliceous material or siliceous material alone may be injected into a chamber where impact of the particles against the walls of the chamber or against each other cause comminution of the particles. As mentioned above, comminution of the siliceous material increases the surface area of particles available for reaction with the lime, and/or exposes a more reactive surface of the particles. Comminution of the lime increases the rate of solubility and therefore enables it to enter into reaction more quickly. Both these factors allow the reaction to proceed more quickly, or more completely, thereby resulting in a great improvement in the process and the pellets or granules obtained thereby. CLAIMS
1. A process for the manufacture of lightweight aggregate for use in the building industry which comprises blending a siliceous material with a binder comprising quick lime and/or hydrated lime in an amount less than 5% (calculated as CaO) based on the total dry weight of siliceous material and binder, forming the blend into granules or pellets, if necessary or desired with the addition of water, and curing or hardening the pellets or granules by maintaining them at a temperature within the range of from 35"C to 100"C in an atmosphere saturated with water vapour, wherein at least the lime is comminuted prior to being formed into granules or pellets.
2. A process according to Claim 1, wherein the lime is mixed with a part of the siliceous material and is comminuted by impact with the particles of siliceous material and the lime and said part of the siliceous material is then added to the bulk of the siliceous material and admixed therewith.
3. A process according to Claim 1 or Claim 2, wherein the siliceous material is pulverised flyash and at least a part thereof is comminuted to break up the spherulitic structure and expose the internal surface of the particles.
4. A process according to any one of Claims 1 to 3 wherein the lime and/or siliceous material is comminuted by ball milling or by impact with the walls of a chamber into which they are injected.
5. A lightweight aggregate wherever produced by a process according to any one of Claims 1 to 4.
GB08409467A 1984-04-12 1984-04-12 Lightweight aggregate Expired GB2159143B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08409467A GB2159143B (en) 1984-04-12 1984-04-12 Lightweight aggregate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08409467A GB2159143B (en) 1984-04-12 1984-04-12 Lightweight aggregate

Publications (3)

Publication Number Publication Date
GB8409467D0 GB8409467D0 (en) 1984-05-23
GB2159143A true GB2159143A (en) 1985-11-27
GB2159143B GB2159143B (en) 1987-06-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08409467A Expired GB2159143B (en) 1984-04-12 1984-04-12 Lightweight aggregate

Country Status (1)

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GB (1) GB2159143B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4780144A (en) * 1985-11-13 1988-10-25 Aardelite Holding B.V. Method for producing a building element from a fly ash comprising material and building element formed
US4880582A (en) * 1987-07-22 1989-11-14 Aardelite Holding B. V. Hardening granulated material at elevated temperatures

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1090984A (en) * 1964-11-21 1967-11-15 Jan Hartman Method of producing light-weight aggregates
GB1362372A (en) * 1972-09-07 1974-08-07 Reid N G Cement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1090984A (en) * 1964-11-21 1967-11-15 Jan Hartman Method of producing light-weight aggregates
GB1362372A (en) * 1972-09-07 1974-08-07 Reid N G Cement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FMLEA }THE CHEMISTRY OF CEMENT AND CONCRETE} (3RD EDITION 1970 PUBLISHER ARNOLD) SEE TABLE II ON PAGE 112 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4780144A (en) * 1985-11-13 1988-10-25 Aardelite Holding B.V. Method for producing a building element from a fly ash comprising material and building element formed
US4880582A (en) * 1987-07-22 1989-11-14 Aardelite Holding B. V. Hardening granulated material at elevated temperatures
AU600842B2 (en) * 1987-07-22 1990-08-23 Hoogovens Technical Services Energy & Environment B.V. Hardening granulated material at elevated temperatures

Also Published As

Publication number Publication date
GB8409467D0 (en) 1984-05-23
GB2159143B (en) 1987-06-17

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