WO1983002267A1 - Method and apparatus for manufacturing glass splinter mass - Google Patents

Method and apparatus for manufacturing glass splinter mass Download PDF

Info

Publication number
WO1983002267A1
WO1983002267A1 PCT/FI1982/000066 FI8200066W WO8302267A1 WO 1983002267 A1 WO1983002267 A1 WO 1983002267A1 FI 8200066 W FI8200066 W FI 8200066W WO 8302267 A1 WO8302267 A1 WO 8302267A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
glass
basin
mass
splinter
Prior art date
Application number
PCT/FI1982/000066
Other languages
French (fr)
Inventor
Ahlström Osakeyhtiö A.
Original Assignee
Laitinen, Keijo
Loikas, Taimo
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 Laitinen, Keijo, Loikas, Taimo filed Critical Laitinen, Keijo
Priority to NL8220489A priority Critical patent/NL8220489A/en
Priority to GB08318423A priority patent/GB2123811A/en
Priority to JP83500341A priority patent/JPS58502202A/en
Publication of WO1983002267A1 publication Critical patent/WO1983002267A1/en
Priority to DK333383A priority patent/DK333383A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/10—Forming beads
    • C03B19/1005—Forming solid beads
    • C03B19/1045—Forming solid beads by bringing hot glass in contact with a liquid, e.g. shattering

Definitions

  • the present invention is related to a method and an apparatus which provide a new mode of manufacturing dry glass splinters in glass production plants.
  • a continuous glass production process is often employed. From time to time, e.g. in connection with production disturban ⁇ ces, process start-ups, changes of quality or the like, molten material is caused to flow past the production process.
  • the usual conventional practise is to draw off the molten mass to a water basin or to a conveyor provided with a water basin, such as is disclosed e.g. in US Patents 3.523.015 and 4.230.477, where the glass is quenched and where it thereby is crushed.
  • the glass mass is cooled by means of the effect of the water thereby loosing its thermal capacity and thus causing a increase in the temperature of the water. This is compensated by bringing in new water to the water basin.
  • the water content of this kind of glass splinter mass when removed from water is, according to measurements carried out, usually 6 to 10 % of the total weight.
  • US Patent 4.277.273 discloses a method for treating molten slag in such a way that the solidification of the flux is performed by means of a water amount that can be regulated, the disintegration by means of a drum-like chopping apparatus and the drying partly by means of an air flow flushing the grain shower caused by the chopper, partly by means of draining which takes place on a perforated conveyor.
  • this method cannot be applied for exacting drying, such as that of glass splinter mass, as it employs air-drying only for a short period of time when the mass is in an completely wet state and the draining is carried out on the conveyor. This process yields in a quick way a so called drainage dry product.
  • the glass fibre produced by this method has to be treated separately in a centrifuge process. Also the noice level of this method is detrimentally high.
  • the equipment required by the method is apparently suscept ⁇ ible to abrasion and clogging in the treatment of glass splinter mass.
  • This kind of dried glass splinter can be removed by conveyors straight into a storage silo located near the weighing equipment, and thus the treatment of the glass splinter can, when required, be built in as an automized process of the industrial plant.
  • the method according to the invention is based on the following idea:
  • the quenching and cooling of the glass trickle can be carried out, instead of the con ⁇ ventional way - sinking into a water basin - just by means of regulated flushing by flowing water, whereby the heat is not removed from the hot glass .trickle to a large quantity of water, as usually, but mainly by evaporating water.
  • the final temperature of the glass can be regulated by regulating the amount of water with regard to the amount of glass. This enables the storaging of the heat required for the drying in the glass splinter mass, more permanently in bigger splinters, and only a minor quantity of water is stored between the splinters in the mass. Thus there is less alkaline water, which is difficult to evaporate, to be dried from the surface of the splinters.
  • Fig. 1 is a scheme of an apparatus for applying the method according to the inventionj and
  • Fig. 2 shows detail A of Fig. 1 in a bigger scale.
  • the apparatus comprises a basin 1, a thereto affixed flight conveyor 2 and a rotary drum dryer 3.
  • the glass trickle and the flushing water are both fed in through an opening 4 in the basin from a spout 5.
  • the water is dis ⁇ charged from openings 6 in the bottom sides of the basin.
  • a plate 7 of the flight conveyor moves the quenched and crushed glass splinter mass along an inclined bottom 8 of the basin.
  • the inclined bottom is provided with compartments 9 which have been bottomed by a net 10.
  • the water is dis ⁇ charged from the thin layer of glass splinter mass leaning on the plate of the conveyor to the compartments, it passes through the layer of splinter mass gathered in them and is removed through the net bottom.
  • the water draining off from the glass splinter is led along a spout 11 to a water revovery vessel 12 from which the water is repumped to the spout 5.
  • the generated steam is removed by means of a fan
  • the splinter mass is -removed by the flight conveyor 2 to the inclined rotary drum dryer 3 which has lifting blades
  • the splinters fall down in the form of a curtain to the air space of the drum where they are subjected to the flush of an air flow.
  • the splinter is caused to enter a continuous falling movement while the drum rotates and the splinter moves during every rotation towards the discharge end of the drum.
  • the splinter mass removed from the drum is transported away by means of a conveyor 15.
  • Hot glass was run as an approx. 14 kg/ in trickle to a conveying basin according to Fig. 1, the length of the basin being 1,5 m, height 1,5 m and breadth 0,6 .
  • the glass was quenched by means of water flushing. The amount of flushing water was 20 1/min.
  • the moisture of the splinter mass was about 2 %, temperature approx. 70 °C.
  • the splinter mass was run through a drying drum, where it was caused to continuous ly fall through an air flow. The air blowing through the drum was about 2000 m /h, temperature approx. 20 C. After the drying drum, the moisture content of the splinter mass was approx. 0.4 %.
  • drying of the splinter mass can be performed e.g. in an apparatus based on the fluidized bed method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Processing Of Solid Wastes (AREA)
  • Glass Compositions (AREA)
  • Cleaning In General (AREA)

Abstract

Method for manufacturing glass splinter mass, wherein the quenching of a glass trickle flowing in a molten state is carried out by means of a regulable water flow having only a flushing effect. The drying to a water content substantially lower than that of the draining dryness is performed by the joint effect of an air flow and the heat capacity left in the glass splinter mass. The apparatus for carrying out the method comprises a basin (1) and a conveyor (2) affixed thereto and running along an inclined portion (8) of the basin. The bottom of the basin is perforated. The inclined portion of the basin is provided with water removal compartments (9) which are provided with net bottoms (10).

Description

METHOD AND APPARATUS FOR MANUFACTURING GLASS SPLINTER MASS
Technical Field:
The present invention is related to a method and an apparatus which provide a new mode of manufacturing dry glass splinters in glass production plants.
Background Art:
In glass production plants, such as glass container works, household glass works, glass fibre works etc., a continuous glass production process is often employed. From time to time, e.g. in connection with production disturban¬ ces, process start-ups, changes of quality or the like, molten material is caused to flow past the production process. The usual conventional practise is to draw off the molten mass to a water basin or to a conveyor provided with a water basin, such as is disclosed e.g. in US Patents 3.523.015 and 4.230.477, where the glass is quenched and where it thereby is crushed.
In US Patent 4.268.295 there is disclosed a method for treating molten slags wherein the slag is rolled to a film which is then face hardened by means of jets of water and wherein the final quenching is carried out, as in the aforementioned cases, in a water basin, while the final crushing and disintegration are carried out in a separate crusher. -
In these methods the glass mass is cooled by means of the effect of the water thereby loosing its thermal capacity and thus causing a increase in the temperature of the water. This is compensated by bringing in new water to the water basin. The water content of this kind of glass splinter mass when removed from water is, according to measurements carried out, usually 6 to 10 % of the total weight. When splinter mass of this kind is reused, as is common at glass'
Gλ.PI works, it has to be transported to some separate space for drying.
Usually drying is performed by draining whereby the mass cools to a so called draining dryness, i.e. its average water content is approx. 4 %, while the water content of finely pulverized glass splinter mass of a size less than 1 mm can be as high as 15 %. The draining of glass splinter mass is rendered particularly difficult by the fact that when quenching is carried out by cooling, alkalies are dissolved in the water which cause the water remaining on the surface of the glass to become like water glass and thus difficult to be evaporated. The dilemma is emphasized when small splinters, < 1 mm, are in question, as in the process they tend to form a sticky mass that cannot be dried. When the mass, both the splinters and the water, has in these processes cooled down due to the effect of the basin water, the moisture content of the mass remains permanently high.
These currently used methods have several drawbacks. In them, practically the entire heat capacity of the glass mass is removed to the water, wherefore they consume considerable quantities of cooling water, as the water temperature of the basin is kept low by bringing new cold water into the basin. At the same time, cooled alkaline water remains on the surfaces of the splinters and between the splinters and thus forms a splinter mass which cools down difficultly. The splinter mass has to be transported in containers or by means of a truck to the cooling and from there back to the melting process, which causes a lot of work and binds transport equipment for this purpose. These factors together mean continuous expences for the plant.
The drying of glass splinter mass requires its own space and often also sewerage for removing the flowing water.
Draining cannot be regarded as a good solution for the melting process, as the water content remains quite high, on the order of 4 % of the total weight. As the percentage of the glass splinter fed back to the process is high, consid¬ erable quantities of water go to the melting furnace for evaporation. Also the dosing accuracy of raw material suffers from the changing water content. These facts mean an increase in the energy costs and a disturbance risk for the melting process.
The currently used methods with their equipment require a lot of space due to the size of the equipment and the passage requirements.
US Patent 4.277.273 discloses a method for treating molten slag in such a way that the solidification of the flux is performed by means of a water amount that can be regulated, the disintegration by means of a drum-like chopping apparatus and the drying partly by means of an air flow flushing the grain shower caused by the chopper, partly by means of draining which takes place on a perforated conveyor. Despite its obvious advantages, this method cannot be applied for exacting drying, such as that of glass splinter mass, as it employs air-drying only for a short period of time when the mass is in an completely wet state and the draining is carried out on the conveyor. This process yields in a quick way a so called drainage dry product. Furthermore, the glass fibre produced by this method has to be treated separately in a centrifuge process. Also the noice level of this method is detrimentally high. The equipment required by the method is apparently suscept¬ ible to abrasion and clogging in the treatment of glass splinter mass.
Disclosure of the invention:
It is an object of the present invention to eliminate the drawbacks of the known methods and to provide a method and an apparatus by means of which the moisture content of the glass splinter mass, including the finely-grained particles, is reduced substantially from so called drainage dryness, and to reduce the size of the apparatus consider¬ ably. This kind of dried glass splinter can be removed by conveyors straight into a storage silo located near the weighing equipment, and thus the treatment of the glass splinter can, when required, be built in as an automized process of the industrial plant.
The method according to the invention is based on the following idea:
As glass splinter in a molten, flowing state contains thermal energy approx. 1.2 kJ/kg C, the energy can be utilized in the drying of the glass.
It has been found out that the quenching and cooling of the glass trickle can be carried out, instead of the con¬ ventional way - sinking into a water basin - just by means of regulated flushing by flowing water, whereby the heat is not removed from the hot glass .trickle to a large quantity of water, as usually, but mainly by evaporating water. In tests it has been found that the final temperature of the glass can be regulated by regulating the amount of water with regard to the amount of glass. This enables the storaging of the heat required for the drying in the glass splinter mass, more permanently in bigger splinters, and only a minor quantity of water is stored between the splinters in the mass. Thus there is less alkaline water, which is difficult to evaporate, to be dried from the surface of the splinters.
It has been found that the drying can be made more efficient after the water flushing and the load of redrying can be decreased by building water removal compartments on the inclined bottom of the water basin, along which the conveyor conveyes the glass splinter. The conventionally used perforated bottom, such as disclosed by US Patent 3.523.015, gets clogged by the splinters and the desired
OMP water removal does not occur. Thus the flight conveyor acts as a water pump, conveying water along with the splinters to the discharge end of the conveyor. In the tests carried out, the water removal compartments which during the drying process are filled with coarse splinters have turned out to be efficient, removing approximately 2 % water. (Example 2) As comparative percentages for the water content of the splinter mass the following percentages are obtained experimentally:
- removed by means of the flight conveyor from the water in the basin, 7 - 9 %
- just flushed by water, removed by means of the flight conveyor, approximately 4 %
- flushed by water and removed over the water removal compartments by means of the.flight conveyor, 2 %
Thus the new process for manufacturing dry glass splinter mass can be described in the following way: A molten, flowing glass trickle is just flushed by flowing water, the amount of which is regulated and thus a desired thermal capacity is left in the forming glass splinter mass. Water remaining in the splinter mass is removed through the bottom of the water basin through various water removal compartments and the remaining alkaline water is evaporated by a rotary drum dryer provided with blades during a longer contact period by means of the joint effect of the air flow and the thermal capacity left in the splinter mass.
Brief description of the drawings:
The invention is further described in the following with reference to the accompanying drawings in which: -
Fig. 1 is a scheme of an apparatus for applying the method according to the inventionj and
Fig. 2 shows detail A of Fig. 1 in a bigger scale.
The apparatus comprises a basin 1, a thereto affixed flight conveyor 2 and a rotary drum dryer 3. The glass trickle and the flushing water are both fed in through an opening 4 in the basin from a spout 5. The water is dis¬ charged from openings 6 in the bottom sides of the basin. A plate 7 of the flight conveyor moves the quenched and crushed glass splinter mass along an inclined bottom 8 of the basin.
The inclined bottom is provided with compartments 9 which have been bottomed by a net 10. The water is dis¬ charged from the thin layer of glass splinter mass leaning on the plate of the conveyor to the compartments, it passes through the layer of splinter mass gathered in them and is removed through the net bottom. The water draining off from the glass splinter is led along a spout 11 to a water revovery vessel 12 from which the water is repumped to the spout 5. The generated steam is removed by means of a fan
13. The splinter mass is -removed by the flight conveyor 2 to the inclined rotary drum dryer 3 which has lifting blades
14. The splinters fall down in the form of a curtain to the air space of the drum where they are subjected to the flush of an air flow. The splinter is caused to enter a continuous falling movement while the drum rotates and the splinter moves during every rotation towards the discharge end of the drum. The splinter mass removed from the drum is transported away by means of a conveyor 15.
In the following, there is an example typical of the conventional method and an example illustrating the method according to the invention.
Example 1
In the trial, hot glass was run as an approx. 10 kg/min trickle to the conveying basin, the length of which was approx. 5 m, height 2,5 m and breadth 0,6 m and where the water level was approx. 1,5 m. The water flow was approx. 60 1/min. The moisture of the splinter mass removed from the flight conveyor was 7 to 9 % while the temperature was approx. 30 °C.
Example 2
Hot glass was run as an approx. 14 kg/ in trickle to a conveying basin according to Fig. 1, the length of the basin being 1,5 m, height 1,5 m and breadth 0,6 . The glass was quenched by means of water flushing. The amount of flushing water was 20 1/min. The moisture of the splinter mass was about 2 %, temperature approx. 70 °C. The splinter mass was run through a drying drum, where it was caused to continuous ly fall through an air flow. The air blowing through the drum was about 2000 m /h, temperature approx. 20 C. After the drying drum, the moisture content of the splinter mass was approx. 0.4 %.
The specific embodiment shown is not meant to limit the invention but it can be varied in several ways within the scope of the following inventional conception. Thus the drying of the splinter mass can be performed e.g. in an apparatus based on the fluidized bed method.

Claims

We claim:
1. A method for manufacturing glass splinter mass, wherein the annealing of a glass trickle flowing in a molten state is carried out by means of a regulable water flow having only a flushing effect and the drying to a water content substantially lower than that of drainage dry matter is performed by the joint effect of an air flow and the heat capacity left in the glass splinter mass within a longer contact time.
2. A method according to claim 1 wherein the alkaline water fastening on the surface of the glass splinter mass is evaporated substantially.
3. An apparatus for practicing the method according to claim 1, comprising a basin and a thereto affixed conveyor, wherein the bottom of the basin is perforated.
4. An apparatus according to claim 3, wherein perforat¬ ed water removal compartments with net bottoms are disposed in the inclined bottom portion of the basin.
PCT/FI1982/000066 1981-12-31 1982-12-22 Method and apparatus for manufacturing glass splinter mass WO1983002267A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL8220489A NL8220489A (en) 1981-12-31 1982-12-22 METHOD AND APPARATUS FOR MANUFACTURING A MASS OF GLASS SPLINTERS
GB08318423A GB2123811A (en) 1981-12-31 1982-12-22 Method and apparatus for manufacturing glass splinter mass
JP83500341A JPS58502202A (en) 1981-12-31 1982-12-22 Method and apparatus for producing crushed glass lumps
DK333383A DK333383A (en) 1981-12-31 1983-07-19 METHOD AND APPARATUS FOR PRODUCING GLASS PIPE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI814233811231 1981-12-31
FI814233A FI814233L (en) 1981-12-31 1981-12-31 FOERFARANDE OCH ANORDNING FOER FRAMSTAELLNING AV GLASSKAERVMASSA

Publications (1)

Publication Number Publication Date
WO1983002267A1 true WO1983002267A1 (en) 1983-07-07

Family

ID=8514993

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1982/000066 WO1983002267A1 (en) 1981-12-31 1982-12-22 Method and apparatus for manufacturing glass splinter mass

Country Status (13)

Country Link
JP (1) JPS58502202A (en)
BE (1) BE895481A (en)
DE (1) DE3249332T (en)
DK (1) DK333383A (en)
ES (1) ES518657A0 (en)
FI (1) FI814233L (en)
FR (1) FR2519332A1 (en)
GB (1) GB2123811A (en)
IT (1) IT8268539A0 (en)
NL (1) NL8220489A (en)
NO (1) NO832974L (en)
SE (1) SE8304376D0 (en)
WO (1) WO1983002267A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT395546B (en) * 1990-12-19 1993-01-25 Binder Co Ag Sorting device for old glass
EP0988256A1 (en) * 1997-05-30 2000-03-29 Kennecott Holdings Corporation Apparatus for and process of water granulating matte or slag

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE273519C (en) *
DE369618C (en) *
DE368570C (en) * 1923-02-06 Michael Wagner Method and device for coring slag
DE396104C (en) * 1920-05-23 1924-05-26 Adolf Liebrich Dr Process for coring blast furnace slag using water
US2137931A (en) * 1938-11-22 Method of and apparatus for granu
DE913729C (en) * 1941-05-23 1954-06-18 Administration Sequestre Des R Process for granulating metals and slag
US3615329A (en) * 1969-03-18 1971-10-26 American Smelting Refining A recirculatory system for the granulation of molten slag
US3938975A (en) * 1973-08-27 1976-02-17 Nippon Steel Corporation Treatment of blast furnace slag
DE2614885B2 (en) * 1975-04-07 1979-03-22 Hoogovens Ijmuiden B.V., Ijmuiden (Niederlande) Device for granulating blast furnace slag
US4218412A (en) * 1975-07-16 1980-08-19 Showa Denko Kabushiki Kaisha Method for preventing vapor explosion in a liquid comminuting process

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1865367A (en) * 1930-03-05 1932-06-28 Hazel Atlas Glass Co Method and apparatus for simultaneously emptying glass tanks and reducing the molten glass to granules
CH245745A (en) * 1945-08-20 1946-11-30 Bbc Brown Boveri & Cie Process for extinguishing and drying the slag resulting from the reduction of ores.
FR2446265A1 (en) * 1979-01-12 1980-08-08 Inst Metall Teplo Molten slag granulator - with extracting elevator sprockets above fluid level of water bath for corrosion protection

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE273519C (en) *
DE369618C (en) *
DE368570C (en) * 1923-02-06 Michael Wagner Method and device for coring slag
US2137931A (en) * 1938-11-22 Method of and apparatus for granu
DE396104C (en) * 1920-05-23 1924-05-26 Adolf Liebrich Dr Process for coring blast furnace slag using water
DE913729C (en) * 1941-05-23 1954-06-18 Administration Sequestre Des R Process for granulating metals and slag
US3615329A (en) * 1969-03-18 1971-10-26 American Smelting Refining A recirculatory system for the granulation of molten slag
US3938975A (en) * 1973-08-27 1976-02-17 Nippon Steel Corporation Treatment of blast furnace slag
DE2614885B2 (en) * 1975-04-07 1979-03-22 Hoogovens Ijmuiden B.V., Ijmuiden (Niederlande) Device for granulating blast furnace slag
US4218412A (en) * 1975-07-16 1980-08-19 Showa Denko Kabushiki Kaisha Method for preventing vapor explosion in a liquid comminuting process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT395546B (en) * 1990-12-19 1993-01-25 Binder Co Ag Sorting device for old glass
EP0988256A1 (en) * 1997-05-30 2000-03-29 Kennecott Holdings Corporation Apparatus for and process of water granulating matte or slag
EP0988256A4 (en) * 1997-05-30 2000-07-19 Kennecott Holdings Corp Apparatus for and process of water granulating matte or slag

Also Published As

Publication number Publication date
FI814233L (en) 1983-07-01
BE895481A (en) 1983-04-15
ES8501349A1 (en) 1984-12-01
NO832974L (en) 1983-08-18
DK333383D0 (en) 1983-07-19
SE8304376L (en) 1983-08-11
SE8304376D0 (en) 1983-08-11
NL8220489A (en) 1983-11-01
ES518657A0 (en) 1984-12-01
DE3249332T (en) 1984-03-22
DK333383A (en) 1983-07-19
GB2123811A (en) 1984-02-08
FR2519332A1 (en) 1983-07-08
JPS58502202A (en) 1983-12-22
IT8268539A0 (en) 1982-12-31
GB8318423D0 (en) 1983-08-10

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