CA1332392C - Process and device for micronizing solid matter in jet mills - Google Patents

Process and device for micronizing solid matter in jet mills

Info

Publication number
CA1332392C
CA1332392C CA000557532A CA557532A CA1332392C CA 1332392 C CA1332392 C CA 1332392C CA 000557532 A CA000557532 A CA 000557532A CA 557532 A CA557532 A CA 557532A CA 1332392 C CA1332392 C CA 1332392C
Authority
CA
Canada
Prior art keywords
disposed downstream
process according
injector
jet mill
solid matter
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 - Fee Related
Application number
CA000557532A
Other languages
French (fr)
Inventor
Hans-Gunter Zander
Horst Bornefeld
Bernd-Michael Holle
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.)
Kerr-Mcgee Pigments & Co KG GmbH
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Application granted granted Critical
Publication of CA1332392C publication Critical patent/CA1332392C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00Other disintegrating devices or methods
    • B02C19/06Jet mills

Abstract

PROCESS AND DEVICE FOR MICRONIZING SOLID MATTER IN JET
MILLS

ABSTRACT OF THE DISCLOSURE
A process for micronizing solid matters in a jet mill, wherein the solid matters are brought into the jet mill across an injector and wherein the micronization takes place, if necessary, in the presence of milling aids and/or dispersing agents, wherein the solid matters are forcibly supplied to the injector and an apparatus for carrying out the process, the apparatus comprising a dosing means, a forcible entry means, and injector and a jet mill.

Description

- 1- 1 3323q2 PROCESS AND DEVICE FOR MICRONIZING SOLID MATTER IN JET
MILLS

BACKGROUND OF THE INVENTION
Field of the Invention The invention relates to a process for micronizing solid matter in jet mills, wherein the solid matter is brought into the jet mill across an injector by means of a propellant and wherein the micronizing takes place if necessary in the presence of grinding andlor dis- :
persing agents.

Backaround of Information The micronizing of solid matter can be carried out in jet mills, for example, of the type of the spiral or counter-pipe jet mills (CF Winnacker, KUchler: Chemische 20 Technologie, 4 Edition, Volume 1, P.91-93, Carl Hanser Verlag MuUnchen, Wien 1984), Jet mills consist of a ~-~
milling sec~ion, into which water vapor jets or air jets are blown at h;gh speeds, and the solid matter to be micronized (in the following also termed "milling -goods") is brought in across an injector by a pro-: pellante Compressed air or water vapor (in the following referred to in short as "steam"), is usually used as the : propellant in this process. The introduction of the ~: solid matter into the injector occurs as a rule across a feeding hopper or an entry chute, Milling aids are also often added to the 601id matter in order to support the micronization. Further, dispersing agents are usually used especially with ~:~ 35 ;

~ ` 1 3323~2 pigments, improving their dispersability in various material and simultaneously supporting the micronizing of the pigment. The manner mentioned above of intro-ducing solid matter into jet mills has the disadvantage that milling disturbances can occur as a result of blockages of the injector and sedimenting of the milling goods on the walls of the feeding hopper.
These milling disturbances lead as a rule to a decreased quality of the micronized solid matter. In addition, milling goods can leave the jet mill, which is at high pressure9 during these milling disturbances.

SUMMARY OF THE INVENTION
An object of the invention was to prepare a process for the micronizing of solid matter in jet mills that does not display the disadvantages described.
It was then found that milling disturbances and the problems associated with them do not occur if the solid matter is forcibly introduced into the injector of the jet mills.
By the expression "forcible introduction of the solid matter" it is understood according to the inven-; tion that only one degree of freedom of movement is available to the solid matter, i.e., that the solid matter is transported in a forced direction of movement.
A deviation of the solid matter into a different direc-tion of movement, as was possible in the usual intro-duction of solid matter into the injector across feeding hoppers or entry chutes (the exiting of milling goods from the jet mill due to blockages in the apparatus), is excluded.
~` 35 -` 1 3323q~

The invention provides a process for micronizing solid matters in a jet mill comprising introducing the solid matters into a jet mill across an injector, wherein the solid matters are forclbly pressure sluiced and pneumatically supplied so as to have only one degree of freedom of movement by a pneumatic delivery device to the injector.
DETAILED DESCRIPTION OF THE INVENTION
The forcible introduction of solid matter occurs preferably by fluidizing it with a propellant, preferably compressed air, in the pneumatic delivery device, and transported to the injector. The fluidizing of the solid matter can also occur with other gases, as for example steam.
Ir order to guarantee a disturbance-free operation of the pneumatic delivery device, it is advantageous to introduce the solid matter forcibly and free of recoil into the latter. This takes place preferably by means of a "manlock" which term as used herein refer~ to a pressurized sluicing device. In the process, suitable manlocks of the most various construction types can be used. Manlocks consisting of a combination of a delivery sluice and a blow-through sluice are preferred.
It is particularly advantageous if the introduction of the solid matter into the pneumatic delivery device occurs in even doses.
The even dosing is preferably undertaken through dosing scales. It can, however, also be achieved by a volume measurement of ~he solid matter. These process _ 4 _ 1 3~23 )2 variants enable the maintenance of defined propellant/
solid matter relations in the pneumatic delivery device.
Depending on the requirements, the propellant/solid matter relation can thereby be adapted to the desired value at all times by varying the quantity of solid matter.
In the process according to the invention, injec-tors are preferred which consist according to Fig. 1 of a combination of a steam line ~11), a jet nozzle (13), a solid matterlsteamlair mixing pipe (14) and a collec-ting nozzle (15). This special arrangement guarantees an even introduction of the solid matter/carrier gas mixture into the jet mill placed under high pressure.
In a very advantageous variant of the processaccording to the invention, the forcible introduction of the solid ma~ter and, if necessary, the addition of milling aids and/or dispersing agents is monitored across a pressure measurement at an appliance in the jet mill, wherein the appliance serves, if necessary, as a milling aid and/or dispersing agent distributing device at the same time.
The pressure measurement occurs preferably in ~: measuring cycles, wherein blocking of the device between the measuring cycles is avoided by means of a pressure impulse or by means of a constant quantity of rinsing air on which a pressure impulse is superimposed between the measuring cycles.
The process according to the invention can be used : in the micronizing of various solid matters. Pigments, especially inorganic pigments, such as titaniumdioxide ~:

:

.~., ., ~ .

.", -pigments, ionoxide pigments, chromiumoxide pigments and mixed phased pigments, can be mlcronized according to this process with particular advantage. By means of the special milling or dispersing agent distributing device in the jet mill, an even and homogeneous layering of the pigment~ with products is achieved.
No milling disturbances, with the problems associated with them, occur in carrying out the process according to the invention.
In addition, the milling process and the delivery of the solid matters is optimized throu~h the described dosing and surveyance measures. This makes possible a significantly higher loading of the jet mill, without reducing the quality of ~he micronized solid matters.
From another aspect, the invention provides an apparatus for micronizing solid matters, comprising (a) a dosing means, (b) a forcible entry means disposed downstream of the dosing device, wherein the forcible entry means comprises an entry chute, a delivery sluice disposed downstream of the entry chute, a blow-through sluice disposed downstream of the delivery sluice and a pneumatic delivery device disposed downstream of the blow-through sluice, (c) an injector disposed downstream of the forcible entry means and (d) a jet mill disposed downstream of the injector.
Figure l is a somewhat schematic view, partially in section, showing a preferred embodiment of the apparatus in accordance with the present invention.
The dosing device can consist of the various appliances that enable a dosing of solid matters. It is advantageous that it should consist according to Figure 1 of a combination of a supply ,, ',~ .
.. ,,, ~ .. . .
r:, ;.~ .

5a 23189-6677 container (1), a swinging slide (2), a star feeder (3) and a dosing scale ~5).
The forcible entry device, the in~ector and the jet mill can also be of various kinds of constructlon.
In the process, the forcible entry device preferably consists according to Figure 1 of a combination of . ~

~,c' `' ' i~

- 6 - l 3 323q2 an entry chute t6), a delivery sluice (7), a blow-through sluice (9) and a pneumatic delivery device (10).
Individual parts of the forcible entry device can be replaced by other suitable parts or apparatus. For example, instead of the delivery sluice (7) and the blow-through sluice ~9), pressure sluices d;fferent in kind, but of an ident;cal manner of funct;on;ng can be installed.
A device according to the invention is particularly preferred in wh;ch the ;njector cons;sts according to Fig, 1 of a combination of a steam line (11), a jet nozzle (13), a solid matter/steamlair mixing pipe (14) and a collecting nozzle (15).
The injector can, however, also be of customary design. Such an injector is depicted, for example, in Winnacker, Kuchler, Chemische Technologie, 4th Edition, Vol 1, page 93, Carl Hanser Verlag Munchen, Wien 1984.
A device according to the inven~ion is also parti-cularly preferred in which an appliance (17) fnr pressure measurement is installed in the jet m;ll according to Fig. 1, serving, if necessary, as a m;lling aid and/or dispersing agent distributing device.
The process according to the invention and the appliance associated with it will now be more closely explained with reference to Fig. 1.
The m;Il;ng goods enter into the supply vessel (1).
A swing sl;de (2) t with which the outlet can be closed and opened, is located at the outlet of the supply vessels. The miIling goods arr;ve across the dosing :

;~

. ,. -.

scale (5), which is fed from ~he star feeder (3), at the S forced entry devicQ. The number of revolutions of the star feeder (3) is regula~ed independently of the desired quantity of the milling goods.
The junction main (4), to which a dust filter i5 attached, serves to equalize pressure. In the forcible entry appliance, the milling goods enter across the entry chute ~6) into the pressure sluice, which consists of a delivery sluice t7) and a blow-through sluice (9).
The solid matter is transported forcibly and without recoil across this special pressure sluice into the pneumatic delivery device (10). In the pneumatic deli-very device, the milling goods are fluidized withcompressed air and delivered to the solid mat~erl steaml air mixing pipQ (14) of the injector. The quantity of compressed air can be surveyed with the measuring instrument (8), in the process, The fluidized milling goods are finally transported with steam, which is guided across the steam line (11) and the jet nozzle (13) to the solid matter/steamlair mixing pipe (14), across the collecting nozzle (15) into the jet mill (16). The quantity of steam is surveyed with the measuring instrument (12) in the process.
At the entry to the jet mill there is an appliance (17) for measuring pressure, across which milling andlor disper~ing products can also be added. The appliance consists according to the invention of several openings or pipe ends, wherein an apparatus for measuring pressure is connected to one opening and one or several milling aids andlor dispersing agents can be added to I~V,i"', ~

. . ; .

~he fluidized solid matter across the other openings.
The addition of the millin~ aid and/or dispersing agent occurs therein preferably across dosing pumps.
The pressure measurement is carried out in measuring cycles, Between each measuring cycle, a pressure impulse or a constant quantity of rinsing air on which a pressure impulse is superimposed between the measuring cycles is applied to the sppliance (17), by which means blocking of the appliance with solid matter is avoided.
With this special appliance, the whole milling process, including the dosing of the milling goods, the forcible entry of the solid matter into the injector, the driving of the injector and the addition of milling andlor other dispersing products can be surveyed. The addition of the milling aids and/or dispersing agents can take place in exact dependence on the weight of the milling goods with the help of the dosing scale and this special measuring device.
In case of deviations of the pressure within the mill from a predetermined desired value, i.e., devia--~ 25 tions from the optimal milling conditions, quick correc-~ tive measures can be taken, whereby quality variations;:
in the micronized solid matter can be safely avoided.
The fo}lowing example shows the advantages of the process according to the invention compared with a customary process for the micronizing of solid matter:

~: .
~ 35 ~..''r ~

1 33~3q~

Exam~le 1 A titanium dioxide pigment with rutile structure produced according to the sulphate process, that was subsequently treated with 0.8% by weight Sio2 and 2.2%
by weight A12O3, was micronized in a device according to the invention according to Figure 1 under addition of a dispersing product. A reaction product of trimethylol propane with ethylene oxide, dissolved in wate.. was used as a dispersinq product, as is described in ~E-B-1,467,442, example 2. The quantity of dispersing product was 0.25% by weight in relation to the dry pigment.

~ The device was composed of the following individual :~ parts:

~ (a) a dosing device, consisting of a combination of a -~ supply silo (1), a swinging slide (2), a star feeder (3) and a belt weigher (5), wherein all ' instruments were of customary construction type;

(b) a forcible entry device, consisting of a combination of an `entry chute ~61 of customary ; construction type, a delivery sluice (7), a blow-through sluice (9) and a pneumatic transporting ;
~:;

,;, . . ~ ~ . . ~ .

, . ~.~ .

~ 3~2392 device (10), wherein the delivery sluice and the blow-through sluice were customary commercial star feeders of V4A-steel with a star feeder diameter of 300mm, and the pneumatic transporting device was a compressed air main with an orifice gauge;

(c) a special injector with a steam line (11) of customary construction type, a jet nozzle (13), a solid matter/steam/air mixing pipe (14) and a collecting nozzle (15), wherein the jet mill was a customary commercial nozzle of cast bronze, the collecting nozzle consisted of a venturi tube of ST-60-steel and the solid matter/steam/air mixing pipe (14) was finished out of a V4A-steel pipe with a diameter of 80mm;

(d) a spiral jet mill (16) of customary construction with a diameter of 915mm, in which an appliance for pressure measurement (17) was located at the entrance of the mill behind the collecting nozzle (15), across which appliance the dispersing product distribution also took place.

The dispersing product was added in the quantity indicated to the fluidized pigment across a customary com~ercial dosing pump. The pressure measurement was aohieved with a pressure measurement apparatus of customary construction type.

The pneumatic transporting device was driven with air at~a pressure of 4 bar. 130 cm2 (0.16 tons) of air were used per hour and per ton of the titanium dioxide pi~gment.

., ' ,,~

1 3323q2 ll 2.0 tons of steam per ton of the titanium dioxide pigment were required for the micronizing.
The flow rate of the titanium dioxide pigment was 2.0 to 2.3 tons per hour.
No milling disturbances of any kind occurred during the operation of this appliance, and the micronized titanium dioxide pigment could be maintained at the desired high quality.
ExamPle 2 (com~arison examPle) The titanium dioxide pigment used in example 1 was micronized in a customary appliance under addition of the same dispersing product as the one depicted in Winnacker, K~chler, Chemische Technologie, 4th Edition, Vol. 1, page 93, Carl Hanser Verlag Mùnchen, Wien, 1984. A spiral jet mill of the same type as in example 1 was used.
The entry of the pigment into the injector took p~ace across an entry chute, wherein the injector and the entry chute were of customary construction type. The dispersing product addition was achieved by known means through the continuous spraying of the pigment in the ~.
entry chute in the same quantity as that given in example 1.

In the operation of this device, 2.4 tons of steam per ton of titanium dioxide pigment were used for the micronization. The flow rate of the titanium dioxide pigment was l.S to 1.8 tons per hour.
: , ~:.~. ;. .-. - ..
! ~
~,.~, ~ . ` .

Up to ten milling disturbances appeared per day, which was also connected with the produc~ion of pigments of partially diminished quality.

A comparison with example 1 shows that in the applica-tion of the process according to the invention, the through-put quantities of the titanium dioxide pigment could be considerably increased. A steam saving of 0.4 tons per ton of the titanium dioxida pigment was connected to that, and the production of pigmen~ of diminished quality is safely avoided.

It will be appreciated that the instant specification and claims are set forth by way of illustration and not limitation, and that various modificat;ons and changes may be made without departing from the spirit and scope of the present invention.

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Claims (17)

1. A process for micronizing solid matters in a jet mill comprising introducing the solid matters into a jet mill across an injector, wherein the solid matters are forcibly pressure sluiced and pneumatically supplied so as to have only one degree of freedom of movement by a pneumatic delivery device to the injector.
2. A process according to claim 1, which further comprises the micronizing taking place in the presence of milling aids and/or dispersing agents.
3. A process according to claim 1, wherein the solid matters are brought into the pneumatic delivery device without recoil.
4. A process according to claim 1, wherein the introduction of the solid matters occurs in even dosages.
5. A process according to claim 1, wherein the injector comprises a steam line, a jet nozzle, a solid matter/steam/air mixing pipe and a collecting nozzle.
6. A process according to claim 1, wherein the forcible introduction of the solid matters is monitored across a pressure measurement at an installation in the jet mill.
7. A process according to claim 6, wherein the installation serves simultaneously as a milling aid and/or dispersing agent distributing device.
8. A process according to claim 2, wherein the milling aids and/or dispersing agents are monitored across a pressure measurement at an installation in the jet mill.
9. A process according to claim 6, wherein the pressure measurement occurs in measuring cycles and a blocking of the installation is avoided by a pressure impulse between the measuring cycles.
10. A process according to claim 6, wherein the pressure measurement is carried out in measuring cycles and blocking of the installation is avoided by means of a constant quantity of rinsing air on which a pressure impulse is superimposed between the measuring cycles.
11. A process according to claim 8, wherein the pressure measurement occurs in measuring cycles and a blocking of the installation is avoided by a pressure impulse between the measuring cycles.
12. A process according to claim 8, wherein the pressure measurement is carried out in measuring cycles and blocking of the installation is avoided by means of a constant quantity of rinsing air on which a pressure impulse is superimposed between the measuring cycles.
13. An apparatus for micronizing solid matters, comprising (a) a dosing means, (b) a forcible entry means disposed downstream of the dosing device, wherein the forcible entry means comprises an entry chute, a delivery sluice disposed downstream of the entry chute, a blow-through sluice disposed downstream of the delivery sluice and a pneumatic delivery device disposed downstream of the blow-through sluice, (c) an injector disposed downstream of the forcible entry means and (d) a jet mill disposed downstream of the injector.
14. An apparatus according to claim 13, wherein the dosing means comprises a supply container, a swinging slide disposed downstream of the supplycontainer, a star feeder disposed downstream of the swinging slide and a dosing scale disposed downstream of the star feeder.
15. An apparatus according to claim 13, wherein the injector comprises a steam line feeding into a jet nozzle, a solid matter/steam/air mixing pipe disposed downstream of the jet nozzle and a collecting nozzle disposed downstream of the solid matter/steam/air mixing pipe.
16. An apparatus according to claim 13, which further comprises an appliance for pressure measurement, said appliance being disposed in the jet mill.
17. An apparatus according to claim 16, wherein the appliance serves as a milling aid and/or dispersing agent distributing means.
CA000557532A 1987-01-30 1988-01-28 Process and device for micronizing solid matter in jet mills Expired - Fee Related CA1332392C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873702787 DE3702787A1 (en) 1987-01-30 1987-01-30 METHOD AND DEVICE FOR MICRONIZING SOLIDS IN JET MILLS
DEP3702787.5 1987-01-30

Publications (1)

Publication Number Publication Date
CA1332392C true CA1332392C (en) 1994-10-11

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CA000557532A Expired - Fee Related CA1332392C (en) 1987-01-30 1988-01-28 Process and device for micronizing solid matter in jet mills

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US (2) US4880169A (en)
EP (1) EP0276742B1 (en)
JP (1) JP2659045B2 (en)
AU (1) AU600074B2 (en)
BR (1) BR8800362A (en)
CA (1) CA1332392C (en)
DE (2) DE3702787A1 (en)
ES (1) ES2026577T3 (en)
FI (1) FI87544C (en)
NO (1) NO172787C (en)
ZA (1) ZA88630B (en)

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EP0276742A2 (en) 1988-08-03
AU1064088A (en) 1988-08-04
NO172787B (en) 1993-06-01
FI87544B (en) 1992-10-15
DE3865442D1 (en) 1991-11-21
US4880169A (en) 1989-11-14
FI87544C (en) 1993-01-25
JPS63194750A (en) 1988-08-11
EP0276742A3 (en) 1989-08-30
JP2659045B2 (en) 1997-09-30
NO880172D0 (en) 1988-01-15
NO172787C (en) 1993-09-08
US4917309A (en) 1990-04-17
ES2026577T3 (en) 1992-05-01
EP0276742B1 (en) 1991-10-16
NO880172L (en) 1988-08-01
AU600074B2 (en) 1990-08-02
FI880389A0 (en) 1988-01-28
ZA88630B (en) 1988-08-02
BR8800362A (en) 1988-09-20
DE3702787A1 (en) 1988-08-11
FI880389A (en) 1988-07-31

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