EP0168991A2 - Apparatus for making cement composite materials - Google Patents

Apparatus for making cement composite materials Download PDF

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Publication number
EP0168991A2
EP0168991A2 EP85304463A EP85304463A EP0168991A2 EP 0168991 A2 EP0168991 A2 EP 0168991A2 EP 85304463 A EP85304463 A EP 85304463A EP 85304463 A EP85304463 A EP 85304463A EP 0168991 A2 EP0168991 A2 EP 0168991A2
Authority
EP
European Patent Office
Prior art keywords
slurry
water
reservoir
temperature
cement
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Withdrawn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
EP85304463A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ian Robert Kennedy Greig
James Watson Smith
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers 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 Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Publication of EP0168991A2 publication Critical patent/EP0168991A2/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/526—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a conveyor of the endless-belt type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/59—Mixing systems, i.e. flow charts or diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/527—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a rotating drum, e.g. a sieve drum, from which the materials are picked up by a felt

Definitions

  • the layer of slurry is deposited as a film on the surface of the drum through which a proportion of the water is removed and the film is transferred to a felt belt in contact with the emergent part of the drum, further de-watered by suction through the belt and transferred to an accumulator roller on which the desired thickness of cement composite material is built up.
  • a thick slurry of around 45 to 50% solids content by weight is deposited on a travelling felt belt by means of a reciprocating distributor and de-watered by suction through the belt.
  • the Bell machine uses a slurry of a solids content intermediate between those used in the Hatschek and Magnani machines, which is fed to the surface of a travelling felt belt through the nip between one of the rollers around which the belt is trained and a superposed contra-rotating roller.
  • the layer of slurry on the belt is de-watered by suction and transferred to an accumulator roller to build up the desired thickness.
  • the present invention accordingly provides apparatus for making cement composite materials reinforcea with glass fibres, comprising:-
  • the means for forming the aqueous slurry comprises a water reservoir from which water can be supplied to a slurry mixer, and the means for controlling the temperature of the flocculant-containing slurry comprises means for heating and for cooling the water in the reservoir.
  • the means for heating the water in the reservoir may comprise a steam generator connected through a regulator valve which is controlled by a temperature controller to a pipe opening into the water in the reservoir, while the means for cooling the water in the reservoir may comprise a pump controlled by the temperature controller and arranged to circulate water from the reservoir to and from a cooling lagoon.
  • the means for controlling the temperature of the slurry may further comprise a temperature sensor in the reservoir, connected to the temperature controller.
  • the slurry mixer is arranged to supply a relatively thick slurry comprising water and cement to a olender provided with means for introducing glass fibres into the slurry, the blender being in turn arranged to supply the glass-fibre-containing slurry to a nolding vessel which is connected to the water reservoir for supply of water for diluting the slurry and is also connected to the vat of a Hatschek type machine for feeding the diluted slurry thereto, a tank for containing flocculant solution being connected to the line between the holding vessel and the vat.
  • FIGURE 1 illustrates the layout of a Hatschek machine and the supply of temperature-controlled slurry thereto
  • FIGURE 2 illustrates a Bell Flow-on machine in schematic side elevation.
  • a conventional Hatschek-type machine comprises a horizontal, hollow wire mesh cylindrical sieve 55 mounted for anti-clockwise rotation about its cylindrical axis 56 in a slurry-containing vat 57.
  • the sieve 55 is a continuous moving woven felt 62 which is kept in firm contact with the sieve 55 by means of a rotatably mounted heavy roller 63 and is trained around further rollers 65, 66, 67, 68.
  • the felt 62 passes from the sieve 55 to an accumulator roller 64 on to which a film of slurry can be transferred as described below.
  • the ends of the sieve 55 are fitted with seals (not shown) so that water from the slurry can only flow through the wire mesh and out through discharge ports mounted through the seals.
  • the sieve 55 is rotated with a surface speed of the order of 45 metres/min. and a thin, even film of slurry is deposited on its wire mesh surface while the major part of the water is removed. The thickness of the film depends upon the slurry level in the vat 57, its consistency, and the speed of rotation of the sieve 55.
  • the thin film of glass fibre containing cement'slurry which is collected on the wire mesh of the sieve 55 is transferred to the woven felt 62.
  • the film is then processed in the same manner as is used in forming asbestos cement products by Hatschek machinery, by passing it over at least one vacuum box 72 which draws additional water from the film.
  • the film is then passed under the iron or steel accumulator roller 64, further removal of water being caused by compression between rollers 64 and 66, and is transferred in a continuous operation to the accumulator roller 64 until a sheet is built up on the roller 64 to a desired thickness.
  • the sheet can be knifed along a groove in the accumulator roller 64 and peeled from it on to a conveyor table 73, and subsequently trimmed and cut to desired lengths by saws 74.
  • the slurry for supply to the vat 57 is formed by first mixing a relatively thick slurry of cement, pulverised fuel ash, volatilised silica, cellulose pulp and water, with a solids content of 40 to 60%.
  • the slurry is mixed in a high shear mixer 10 of conventional design, to which water and a supply of aqueous cellulose pulp are fed through lines 11, 12 and 13, while cement and pulverised fuel ash are supplied through line 14 and an aqueous slurry of volatilised silica is fed through line 15.
  • Volatilised silica is a form of finely divided amorphous silica produced as a by-product in the electro-reduction process for production of silicon.
  • any solid processing additives are to De incorporated, they are dispersed in the cement/pulverised fuel ash mixture supplied through line 14.
  • the resultant thick slurry is fed to an interim storage tank 16 where it is kept unaer agitation by means of a rotating mixer blade 17.
  • Alkali-resistant glass fibres e.g. as described and claimed in our UK Patent Specification No. 1,290,528, are mixed into batches of the thick slurry in a olenaer 18.
  • the glass fibres are fed by a vibrating feeder 19 from a hopper 20 and folded into the slurry by rotary and vertical circulation in the blender 18.
  • the batches of thick fibre-containing slurry are transferred to a large holding vessel 21 which contains a low shear rotary agitator 211 and in which the slurry is diluted to a solids content of 6 to 10%, typically 7.5%, by weight, by water supplied through line 22.
  • Line 22 receives the dilution water from a main conical reservoir 24 which also supplies the water through line 11 to the high shear mixer 10.
  • the dilute slurry is supplied from vessel 21 through line 23 to the vat 57.
  • Flocculant solution from tank 25 is added to the slurry in line 23 so that the flocculant is mixed into the slurry just before it passes into the vat 57.
  • the vat 57 is provided with an agitator 26 in the form of a series of similar parallel blades 27 (only one of which can be seen in the Figure) disposed in vertical planes perpendicular to the axis 56 of the sieve 55 and spaced from one another across the width of the vat.
  • the blades are mounted on wheels 28 so that they can be reciprocated parallel to the axis of the sieve for producing the desired agitation of the slurry.
  • a sensor 29 is provided in the conical reservoir 24 and connected to a thermostat device 30 which controls a valve 31 in a steam supply line 32 which has an outlet 33 in the reservoir 24.
  • a non-return valve 34 is provided in the steam line 32 to vent the line 32 when the steam supply is cut off.
  • inlet and outlet lines 35, 36 and a pump 37 are provided for circulating the water to an external cooling lagoon 38, again under the control of the thermostat device 30.
  • a heat exchanger could be incorporated in the line 23 before or after its junction with the supply from the flocculant-containing tank 25, using recirculated steam or hot water as the heating medium.
  • the sensor 29 could De located in the vat 57 instead of in the water reservoir 24.
  • the temperature of the slurry in the vat 57 was gradually increased from a temperature of 150C. At this low temperature, it was not possible to collect material on the rotating sieve 55 because the flocculating action was ineffective and excessive quantities of fine cement particles passed through the sieve. As the temperature was increased, it became possible to collect material from the drum but it was clearly of inferior quality and tne amount of solids passing through the drum remained at an unacceptably high level until the temperature of the slurry reached 20 0 C. At this temperature, the process began to run well, in the manner described above, and the product was of good quality, the best properties being achieved with the slurry temperature around 23°C. Above 25°C, the quality began to deteriorate and as the temperature was increased beyond 27 ⁇ C the product was found to have a porous character and when cured gave a low final strength.
  • the modified Bell Flow-on apparatus comprises a vessel 40 for holding an aqueous fibre-containing cement slurry, and an endless water-pervious felt belt 42, which is arranged to be driven around a series of guide rollers 43, 44, 45. Slurry is delivered to the vessel 40 continuously during operation through a supply pipe 46 corresponding to the line 23 of Figure 1.
  • the right hand end of the vessel 40 is defined partly by the upper surface of the belt 42 as it passes around the guide roller 43 and partly by a superposed roller 47, which is driven in the opposite sense to the sense of rotation of the guide roller 43.
  • a small gap between the upper surface of the belt 42 and the lowermost part of the periphery of the roller 47 constitutes the outlet from the vessel 40 and permits a thin layer 49 of the cement slurry to be deposited on the belt.
  • a rotary agitator 50 is disposed in the vessel 40 to cause turbulence in the slurry.
  • the layer 49 of fibre-containing cement slurry on the belt 42 is de-watered in known manner through the belt using drainage chambers 51. After de-watering, the layer 49 becomes a cohesive web 52 of fibre-reinforced cement which is picked up from the belt 42 and wound on to a rotatable pivotally mounted receiving roller 53. When a sufficient thickness of fibre-reinforced cement has been built up on the surface of the roller 53, it is cut axially of the roller and taken off for pressure de-watering and curing.
  • An additional agitator is provided in the vessel 40, extending into the nip between the roller 47 and the belt 42, and formed by a series of similar parallel curved blades 41 which are disposed in vertical planes parallel to the direction of movement of the belt 42 (i.e. at right angles to the axes of the rollers 43, 47) and spaced from one another across the width of the vessel 40.
  • the olades 41 are secured to a horizontal carriage 48 which extends across the width of the vessel 40 and which is horizontally reciprocable by a motor (not shown) between pairs of upper and lower rollers 54.
  • the glass fibre used is preferably in the form of chopped strands of filaments sized with a size composition such that the strands separate or filamentise into individual filaments in the slurry as in the foregoing Examples, but strands which retain their integrity may be used instead of or in addition to the dispersible fibres.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Paper (AREA)
EP85304463A 1984-07-06 1985-06-21 Apparatus for making cement composite materials Withdrawn EP0168991A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08417349A GB2161106A (en) 1984-07-06 1984-07-06 Apparatus for making cement composite materials
GB8417349 1984-07-06

Publications (1)

Publication Number Publication Date
EP0168991A2 true EP0168991A2 (en) 1986-01-22

Family

ID=10563553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85304463A Withdrawn EP0168991A2 (en) 1984-07-06 1985-06-21 Apparatus for making cement composite materials

Country Status (9)

Country Link
EP (1) EP0168991A2 (fi)
JP (1) JPS6127207A (fi)
AU (1) AU4388985A (fi)
DK (1) DK303485A (fi)
ES (1) ES8607195A1 (fi)
FI (1) FI852677L (fi)
GB (1) GB2161106A (fi)
NO (1) NO852696L (fi)
ZA (1) ZA854801B (fi)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275156A1 (en) * 1987-01-10 1988-07-20 Excel Industries Limited Dry milled fibre cement products
WO1994025234A1 (de) * 1993-04-29 1994-11-10 Eternit-Werke Ludwig Hatschek Aktiengesellschaft Verfahren und anlagen zur herstellung von aus fasern und hydraulischem bindemittel bestehenden produkten
WO2002089954A3 (en) * 2001-05-05 2003-03-06 Psi Global Ltd Method and apparatus for making molded filter elements

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9217594D0 (en) * 1992-08-19 1992-09-30 Reads Plc Process for the treatment of sludge
JPH06339908A (ja) * 1993-06-02 1994-12-13 Kubota Corp 無機質建材の製造方法
RU2710260C2 (ru) * 2018-04-17 2019-12-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) Технологическая линия для производства модифицированных фиброцементных плит
RU2710255C2 (ru) * 2018-04-17 2019-12-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) Технологическая линия для производства модифицированных цементно-волокнистых плит
RU2710248C2 (ru) * 2018-04-17 2019-12-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) Технологическая линия для производства модифицированных фиброцементных облицовочных плит
CN118024538B (zh) * 2024-04-12 2024-06-25 江苏君华特种高分子材料股份有限公司 一种peek板生产输送冷却系统及其工作方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275156A1 (en) * 1987-01-10 1988-07-20 Excel Industries Limited Dry milled fibre cement products
WO1994025234A1 (de) * 1993-04-29 1994-11-10 Eternit-Werke Ludwig Hatschek Aktiengesellschaft Verfahren und anlagen zur herstellung von aus fasern und hydraulischem bindemittel bestehenden produkten
WO2002089954A3 (en) * 2001-05-05 2003-03-06 Psi Global Ltd Method and apparatus for making molded filter elements

Also Published As

Publication number Publication date
FI852677A0 (fi) 1985-07-05
GB2161106A (en) 1986-01-08
FI852677L (fi) 1986-01-07
AU4388985A (en) 1986-01-09
ES544923A0 (es) 1986-05-16
JPS6127207A (ja) 1986-02-06
NO852696L (no) 1986-01-07
ZA854801B (en) 1987-02-25
DK303485A (da) 1986-01-07
GB8417349D0 (en) 1984-08-08
DK303485D0 (da) 1985-07-03
ES8607195A1 (es) 1986-05-16

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Effective date: 19870701

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Inventor name: SMITH, JAMES WATSON

Inventor name: GREIG, IAN ROBERT KENNEDY