US3880410A - Apparatus for manufacturing a coating mass for road constructions - Google Patents

Apparatus for manufacturing a coating mass for road constructions Download PDF

Info

Publication number
US3880410A
US3880410A US368352A US36835273A US3880410A US 3880410 A US3880410 A US 3880410A US 368352 A US368352 A US 368352A US 36835273 A US36835273 A US 36835273A US 3880410 A US3880410 A US 3880410A
Authority
US
United States
Prior art keywords
fraction
grain size
stone
sand
size range
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.)
Expired - Lifetime
Application number
US368352A
Other languages
English (en)
Inventor
Carl-Hermann Heise
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.)
HEISE CARL#HERMANN
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US05/550,865 priority Critical patent/US3938785A/en
Application granted granted Critical
Publication of US3880410A publication Critical patent/US3880410A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068—Supplying or proportioning the ingredients
    • E01C19/1072—Supplying or proportioning the ingredients the solid ingredients
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/026—Arrangements for charging or discharging the materials to be dried, e.g. discharging by reversing drum rotation, using spiral-type inserts

Definitions

  • the fine grain size fraction taken off together with the heating gases has a relatively heterogeneous grain composition.
  • the grain size stepping depends on several factors, such as the initial humidity, the velocity of the air in the drying drum, the specific weight, the shape of the insertions, the heating medium used, and the like. Also, during the drying operation the grain size composition of the fine grain size fraction entrained by the heating gases varies, especially because of power variations and because of the different grain composition for different prescriptions.
  • the stone minerals mixed from different grain size ranges are also screened in their hot condition after the drying operation and before being mixed with bitumen. This is necessary in order to assure a highly homogeneous mixture of the stone minerals.
  • the screen apertures and surfaces required for the screening operation are especially remarkable in the grain size range from O-Z mm. Thus, in most cases greater screen apertures are used in order to decrease the screen surfaces and to be able to screen a greater volume per screen surface unit.
  • this has the disadvantage that stone fractions in the lower grain size ranges are rather inaccurate. On the other hand, these stone fractions substantially determine the cavity fraction of the finished coating mass.
  • the cavity fraction of a coating mass is significant because of a number of essential qualities such as the rigidness of the bitumen binding, the bitumen fraction, and the compression strength of the coating mass.
  • Known manufacturing methods have the further disadvantage that the period of dwell of the individual grain size fractions in the drying drum varies markedly.
  • the fine grain size fraction remains in the drying drum for a relatively long time as it is obtained from the heating gases in certain grain size ranges.
  • the fine grain size fraction is especially accelerated by the as a self filler fraction in the grain size range of 0.09-O.3 mm.
  • the fractions of smaller grain size ranges are especially difficult to control.
  • the essential characteristics of the road coating mass are determined by these fractions.
  • This object is achieved according to the present invention by providing a method for manufacturing a coating mass for road constructions wherein stone minerals of different grain size ranges are dosed, dried, heated. dusted off, and supplemented by a binding agent and other flux materials.
  • This method is characterized in that the stone minerals of the different grain size ranges are separately predosed. dried, and heated and in that absorbed fine material thereby respectively separated from a stone fraction of each respective individual grain size range is divided into a sand fraction and a self filler fraction, after which the sand fraction is again added to the stone fraction of the respective individual grain size range from which it was separated and the self filler fractions of all grain size ranges are combined and weighted.
  • the heated stone and sand fractions are weighted and mixed together with the combined and weighted self filler fractions and the binding agent in order to form the coating mass.
  • each grain size range may be treated individually for a sufficient amount of time.
  • material in the grain size range of 0-2 mm which is separately supplied to the construction site, is predosed and supplied to a separate drying means.
  • this drying means the material is separated into the stone fraction passing the drying means and into the absorbed fine material.
  • the absorbed fine material already has a substantially closer grain size range than the fine grain size fraction that is supplied with the conventional drying means.
  • the absorbed fine material can be separated into a sand fraction and into a self filler fraction.
  • the sand fraction will, for example, include particles in the grain size range of about 0.3-0.8 mm.
  • the self filler fraction will include particles in the grain size range of about 0.090.3 mm.
  • the sand fraction and the stone fraction are re-united, while the self filler fraction is taken off separately and is combined with the self filler fractions of the remaining grain size ranges.
  • By this individual treatment separate dried and heated stone fractions of the individual grain size ranges are obtained free from the self filler fraction. With these heated stone fractions it is possible to follow prescriptions more accurately than was possible before. If desired, strange filler fractions can be added to the combined self filler fraction.
  • the heated stone fractions of the individual grain size ranges are preferably weighted charge-wise and combined.
  • the sand fractions of the absorbed fine materials are added to the stone fractions of the corresponding grain size ranges. This can be done by adding each sand fraction to the stone fraction from which it is derived, or by adding each sand fraction to another suitable stone fraction.
  • the separation of the absorbed fine material into sand and self filler fractions is done in several filter stages. Thus, it is possible to form only one sand fraction and one self filler fraction. However. it is also possible to separate several sand fractions and one self filler fraction.
  • the apparatus for performing this method includes a mixing container for mixing the stone and sand fractions, the self filler fraction and the binding agent and is characterized in that for the stone minerals of each individual grain size range preparing means is provided for predosing, drying, and heating, the stone minerals to separate absorbed fine material from a stone fraction of the stone minerals and for separating the absorbed fine material into a sand fraction and a self filler fraction.
  • preparing means for the treatment of the individual grain size ranges includes a drying drum, a filter means, and a heating silo with a scale and a take-off means.
  • the filter means can be a multi-stage means having a preseparator for the sand fraction and a conveyor located for conveying the sand fraction separated from the fine material.
  • the filter means has a main separator for the self filler fraction and a conveyor located for conveying the self filler fraction separated from the stone fraction and the sand fraction.
  • each drying drum On the side of the material inlet each drying drum has a hollow inlet screw with a preceding dosing means, the filter means for taking off the absorbed fine material and the heating gases connected to the hollow inlet screw.
  • the pre-separator of the filter means can have an enlarged cross section relative to this channel in order to decelerate the stream of absorbed fine material and to separate the sand fraction therefrom.
  • each drying drum is constructed to also serve as a conveyor means for the respective sand fraction separated from the fine material.
  • each drying drum On its outer circumference each drying drum has an outlet screw with a corresponding housing to provide such a conveyor means. In order to combine the stone fractions and the sand fractions this conveyor means and the interior of each drying drum are connected to a respective heating bucket conveyor and heating silo.
  • the heating silo includes a sample take-off stub with a test screen having an electro-mechanical drive means. A portion of the dried stone sand fractions can be taken off by means of this take-off stub and can be fed to a lower test screen in order to control the grain size of the stone and sand fractions in the dried condition. After the weight of the oversize fraction and of the undersize fraction has been determined the preceding and the subsequent grain size can immediately be corrected in accordance with the total prescription.
  • the feed back of the sand fraction pre-separated from the fine material reduces the self filler fraction and simultaneously limits its grain size range.
  • the hollow inlet screw at the inlet of each drying drum assures that the stone minerals are introduced into each drying drum in an air tight manner such that no infiltrating air can enter into the apparatus that would increase the exhaust gas quantity and decrease the drying temperature.
  • the absorption channel connected to the hollow inlet screw at the inlet of each drying drum is also sealed against the entry of infiltrating air. This leads to smaller exhaust gas quantities and smaller filter surfaces.
  • each drying drum can simply be constructed to serve simultaneously as a drive for the heating bucket conveyor.
  • the stone fraction and the sand fraction can be re-united in a simple manner.
  • the undisturbed heat gas conduction and the exclusion of the entry of infiltrating air favor a maximum drying effect by radiation and convection and thus a maximum fraction of the fine material.
  • the stone fractions of the individual grain size ranges are thereby made cleaner.
  • the apparatus allows a quick change of the prescription without the need of operating on preceding stone quantities which are in the preparation process.
  • the control capability of each individual fraction in the range of the heating silo makes it possible to correct the composition of the mixture at any time during the preparation process. During the entire operation there will be no grain overflow, as always only a single fraction is absorbed from each heating silo.
  • the burner means of each drying drum can be adjusted to the respective grain size range. Thus, the drying process is accommodated to the individual materials.
  • Each individual drying drum can also be used as a filler drying apparatus with direct heating.
  • FIG. 1 is a flow and schematic diagram according to the preferred embodiment of the method and apparatus of this invention
  • FIG. 2 is a schematic, longitudinal-sectional view of a single section of an apparatus according to the preferred embodiment of this invention.
  • FIG. 3 is a schematic, cross-sectional view of the same section of the apparatus as is shown in FIG. 2.
  • each stone mineral 1 of a certain grain size range is prepared by a separate means 2. All means 2 for preparing the stone minerals are substantially equal or similar. Each serves to pre-dose, dry, and heat the stone minerals of a respective grain size range and to thereby separate them into a stone fraction and into absorbed fine material comprising a sand fraction and a self filler fraction.
  • a heating silo 3 with a scale 4 is located at the end of each preparing means 2.
  • the stone fraction of the respective grain size range is taken from the heating silo 3 via a scale 4 and, as is explained later, the sand fraction will be added to it.
  • the stone and sand fractions of the different grain size ranges, but not the self filler fractions, are combined via a conveyor means 5 and are stored charge-wise in a container 6.
  • Each preparing means 2 has a filter means 7, which. apart from other purposes, serves to separate the self filler fraction from the stone fraction and the sand fraction such that the self filler fraction can be taken off separately from the stone and sand fraction via a conveyor means 8.
  • the self filler fraction is supplied to a silo 9.
  • Another silo is provided for a strange filler fraction.
  • the self filler fraction is taken off from the silo 9 and/or the strange filler fraction is taken off from the silo 10 via a filler scale 11.
  • This filler fraction is supplied to a filler container 12.
  • the stone fractions, the filler fractions, and the bitumen, as well as eventually further flux materials, are supplied from the container 6, the filler container 12, and a bitumen container 13 into a mixing container 14 and from there to a storage container 15 or to a transport station.
  • the material in the storage container 15 is already the coating mass.
  • each stone mineral l of the respective grain size range be prepared separately from the stone minerals 1 of the remaining grain size ranges.
  • each stone mineral 1 is pre-dosed, dried, and heated in the preparing means 2 and thereby divided into the stone fraction and into the fine material.
  • the fine material is divided into the sand fraction and into the self filler fraction with the aid of the filter means 7 and the sand fraction is again added to the stone fraction.
  • Both the stone and the sand fractions are supplied to the respective heating silo 3.
  • the self filler fraction is separately taken off from each filter means 7 and combined with the other self filler fractions.
  • FIGS. 2 and 3 a single preparing means 2 is illustrated. It consists substantially of a dosing means 16 with a (losing screw 17, a drying drum 18 with a hollow inlet screw 19, a heating bucket conveyor 20, a heating silo 3, and a scale 4. Furthermore, each preparing means 2 has a filter means 7 with a blower 21, a preseparator 22, and a main separator 23.
  • the drying drum 18 has a known burner 24. Furthermore, on its outer circumference it is constructed to serve as a conveyor means. For this purpose it is provided with a screw 25. There is provided a housing 26, which cooperates with the screw 25.
  • Each preparing means 2 also has a filler return screw 27, which is part of the conveyor means 8 of FIG. 1.
  • the hollow inlet screw 19, the drying drum l8, and preferably the heating bucket conveyor 20 are supplied with drive power via a single drive means 28.
  • the filter means 7 has a channel 29, which is connected to the hollow inlet screw 19.
  • a sample take-off stud 30 is located in the area of the heating silo 3.
  • the stone minerals l of the respective grain size range are fed into the dosing means 16 according to the arrow 31.
  • the stone mineral 1 of this grain size range are supplied to the hollow inlet screw 19 by means of the dosing screw 17.
  • the hollow inlet screw 19 introduces the material into the drying drum 18 in an air tight manner.
  • the stone minerals 1 of the respective grain size range are introduced into the drying drum 18 in dosed form.
  • the burner 24 provides the drying and heating of these stone minerals 1.
  • the drying drum 18 is operated in the counter-current mode.
  • the stone minerals 1 of the respective grain size range are divided into the stone fraction, as indicated by the arrow 32, and into the fine material absorbed together with the heating gases, as indicated by the arrow 33.
  • the stone fraction travels through the drying drum 18 in a direction opposite from that of the heating gases.
  • the heating bucket conveyor 20 At the end of the drying drum 18 it is guided to the heating bucket conveyor 20 in the direction of the arrow 34.
  • the stream of heating gases and the fine material absorbed together therewith pass through the hollow inlet screw 19 and the channel 29 by which they are guided to the preseparator 22, which has an extended cross section relative to the channel 29 such that the stream is substantially decelerated.
  • the sand fraction falls from the pre-separator 22 onto a suitable conveyor means or directly onto the outer circumference of the drying drum 18 where the screw 25 is located.
  • the sand fraction is transported on the outer circumference of the drying drum 18 towards the heating bucket conveyor 20 and is introduced into the heating bucket conveyor 20, as is the case with the stone fraction passing through the drying drum 18.
  • a further heating of the sand fraction at the outer circumference of the drying drum takes place thereby improving the efficiency of the heat transfer.
  • the stone fraction and the sand fraction are supplied to the heating silo 3 via the heating bucket conveyor 20. From there they are taken off charge-wise by means of the scale 4.
  • the grain size range of the stone and sand fractions can be examined at all times by means of the take-off stud 30.
  • the stone fraction has a range of about 0.8-2 mm while the sand fraction has a range of about 0.3-0.4 mm.
  • the self filler fraction has a range of less than 0.3 mm. It is supplied via the pre-separator 22 to the main separator 23, as indicated by the arrow 36, and at that location is separated and supplied to the filler return screw 27 of the conveyor means 8 indicated by the arrow 38.
  • the self filler fractions from all the preparing means 2 are combined and are transported by the conveyor means 8 into the silo 9 (see FIG. I).
  • the stone minerals of all grain size ranges are treated separately.
  • an exactly controllable stone and sand fraction without self filler is obtained.
  • the preparing means 2 within the total apparatus for preparing the filler fraction.
  • two dosing means 16 with dosing screws 17 within the range of the hollow inlet screw 19 ofa preparing means 2 in order to jointly prepare stone minerals of the same grain size range but of different origin. For example, this can be done with washing sand or pit-sand, where a certain ratio thereof is defined in the prescription.
  • Apparatus for manufacturing a coating mass for road constructions comprising preparing means for pre-dosing, drying, and heating stone minerals of different grain size ranges to separate the stone minerals of each grain size range into a stone fraction and a fine material comprising a sand fraction and a self filler fraction; filtering means for separating the sand fraction and the self filler fraction of the separated fine material of each grain size range; recombining means for recombining the separated sand fraction of each grain size range with the separated stone fraction of the same grain size range; combining means for combining the separated self filler fractions of all grain size ranges; and mixing means for weighting and mixing the recombined stone and sand fractions of each grain size range together with the combined self filler fractions and a binding agent to form the coating mass.
  • said mixing means includes a mixing container for mixing the recombined stone and sand fractions of each grain size range together with the combined self filler fractions and the binding agent; said preparing means includes separate preparing means for pre-dosing. drying. and heating the stone minerals of each grain size range; and said filtering means includes separate filtering means for separating the sand fraction and the self filler fraction of the separated fine material of each grain size range.
  • each of said separate preparing means comprises a drying drum; each of said separate filtering means comprises a multi-stage filter; and said recombining means includes a separate heating silo for each grain size range. each heating silo having a scale and a sample take-off outlet.
  • each multi-stage filter includes a pre-separator for separating the respective sand fraction.
  • said pre-separator being located adjacent to a conveyor means for the respective separated sand fraction.
  • each multi-stage filtcr further includes a main separator for separating the respective self filler fraction. said main separator being located adjacent to a conveyor means for the respective separated self filler fraction.
  • each preseparator has an extended cross section relative to an absorption channel for conveying the respective separated fine material thereto.
  • each drying drum of each separate preparing means includes a material inlet and is provided with a hollow inlet screw at the side of that material inlet; each separate preparing means is provided with a dosing means adjacent to the hollow inlet screw of the respective drying drum; and each separate multi-stage filter is coupled to the hollow inlet screw of a respective drying drum.
  • each drying drum includes a screw on its outer circumference and a corresponding housing to form a conveyor means for the respective separated sand fraction, said conveyor means and the interior of the drying drum being coupled to a respective heating bucket conveyor and to the respective heating silo for recombining the respective separated stone fraction and the respective separated sand fraction.
  • each heating silo has a sample take-off outlet with a test screen having an electro-mechanical drive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Road Paving Machines (AREA)
  • Road Paving Structures (AREA)
  • Paints Or Removers (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing Of Solid Wastes (AREA)
US368352A 1972-06-10 1973-06-08 Apparatus for manufacturing a coating mass for road constructions Expired - Lifetime US3880410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/550,865 US3938785A (en) 1972-06-10 1975-02-18 Method and apparatus for manufacturing a coating mass for road constructions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2228407A DE2228407C3 (de) 1972-06-10 1972-06-10 Verfahren und Vorrichtung zur Herstellung von Belagmasse für den bituminösen Straßenbau

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/550,865 Division US3938785A (en) 1972-06-10 1975-02-18 Method and apparatus for manufacturing a coating mass for road constructions

Publications (1)

Publication Number Publication Date
US3880410A true US3880410A (en) 1975-04-29

Family

ID=5847434

Family Applications (1)

Application Number Title Priority Date Filing Date
US368352A Expired - Lifetime US3880410A (en) 1972-06-10 1973-06-08 Apparatus for manufacturing a coating mass for road constructions

Country Status (9)

Country Link
US (1) US3880410A (US06486227-20021126-C00005.png)
JP (1) JPS5128293B2 (US06486227-20021126-C00005.png)
CH (1) CH579182A5 (US06486227-20021126-C00005.png)
DE (1) DE2228407C3 (US06486227-20021126-C00005.png)
ES (1) ES415666A1 (US06486227-20021126-C00005.png)
FR (1) FR2187999B3 (US06486227-20021126-C00005.png)
GB (1) GB1426928A (US06486227-20021126-C00005.png)
IT (1) IT989017B (US06486227-20021126-C00005.png)
NL (1) NL7308003A (US06486227-20021126-C00005.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378162A (en) * 1979-02-22 1983-03-29 Bracegirdle P E Process for making asphalt concrete
US6929393B1 (en) * 1998-10-08 2005-08-16 Astec, Inc. Asphalt production plant
US20070116523A1 (en) * 2005-11-02 2007-05-24 Beebe Fred L System and method for remediation of waste material at crushed stone quarry sites

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754772Y2 (US06486227-20021126-C00005.png) * 1976-07-13 1982-11-26
JPS5729737Y2 (US06486227-20021126-C00005.png) * 1976-07-19 1982-06-29
DE3011373A1 (de) * 1980-03-25 1981-10-01 Wibau Industrie und Verwaltung GmbH, 6466 Gründau Verfahren zur kontinuierlichen aufbereitung bituminoesen mischgutes
JP7187195B2 (ja) 2018-07-13 2022-12-12 株式会社シマノ 魚釣用電動リール

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170677A (en) * 1958-08-19 1965-02-23 Bunker Ramo Apparatus for mixing materials
US3625488A (en) * 1969-09-08 1971-12-07 Barber Greene Co Proportioning control system for an asphalt plant
US3661365A (en) * 1970-11-30 1972-05-09 Bonsal Co W R Apparatus for proportioning dry particulate materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170677A (en) * 1958-08-19 1965-02-23 Bunker Ramo Apparatus for mixing materials
US3625488A (en) * 1969-09-08 1971-12-07 Barber Greene Co Proportioning control system for an asphalt plant
US3661365A (en) * 1970-11-30 1972-05-09 Bonsal Co W R Apparatus for proportioning dry particulate materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378162A (en) * 1979-02-22 1983-03-29 Bracegirdle P E Process for making asphalt concrete
USRE32206E (en) * 1979-02-22 1986-07-15 Process for making asphalt concrete
US6929393B1 (en) * 1998-10-08 2005-08-16 Astec, Inc. Asphalt production plant
US20070116523A1 (en) * 2005-11-02 2007-05-24 Beebe Fred L System and method for remediation of waste material at crushed stone quarry sites

Also Published As

Publication number Publication date
ES415666A1 (es) 1976-07-16
FR2187999B3 (US06486227-20021126-C00005.png) 1976-05-28
GB1426928A (en) 1976-03-03
JPS5128293B2 (US06486227-20021126-C00005.png) 1976-08-18
DE2228407C3 (de) 1978-06-15
DE2228407A1 (de) 1973-12-20
NL7308003A (US06486227-20021126-C00005.png) 1973-12-12
IT989017B (it) 1975-05-20
FR2187999A1 (US06486227-20021126-C00005.png) 1974-01-18
JPS4966715A (US06486227-20021126-C00005.png) 1974-06-28
CH579182A5 (US06486227-20021126-C00005.png) 1976-08-31
DE2228407B2 (de) 1977-11-03

Similar Documents

Publication Publication Date Title
US2595117A (en) Method and apparatus for grinding
US2688807A (en) Conveyer-drier
US3880410A (en) Apparatus for manufacturing a coating mass for road constructions
GB2044126A (en) Method and apparatus for cryogenic grinding
CN86104893A (zh) 颗粒材料的加工方法和设备
CN102918345A (zh) 煤粉干燥方法及系统
GB2026881A (en) Mixing particulate materials
CN110461486A (zh) 改性飞灰的制造方法
US3938785A (en) Method and apparatus for manufacturing a coating mass for road constructions
US3397067A (en) Flour product and method of making
CA1246417A (en) Vibrating trough tobacco separator and classifier
US2198972A (en) Method of concentrating nonmetallic minerals
EP0048520A1 (en) Method for drying and size grading fly ash
US4087922A (en) Production of homogeneous mixtures of dry material
SU749666A2 (ru) Установка дл приготовлени бетонной смеси
US3925904A (en) Method and apparatus for drying stillage
US4233190A (en) Process for the production of carbon dioxide absorption agent pellets for use in respiratory equipment
JPH0118649Y2 (US06486227-20021126-C00005.png)
US2905395A (en) Method and apparatus for cooling hot materials by gas
SU768485A1 (ru) Установка дл обеспыливани и рассева влажных материалов
RU46767U1 (ru) Установка для приготовления асфальтобетонной смеси и устройство пылеулавливания
GB609029A (en) An improved installation and process for treating dustcontaining mixtures of substances of different densities
SU1108017A1 (ru) Лини дл производства древесностружечных плит
GB1102213A (en) Improvements in and relating to the dressing of road surfacing material
JP2018002563A (ja) 水硬性石灰及びその製造方法