CA1199621A - Mill - Google Patents
MillInfo
- Publication number
- CA1199621A CA1199621A CA000417337A CA417337A CA1199621A CA 1199621 A CA1199621 A CA 1199621A CA 000417337 A CA000417337 A CA 000417337A CA 417337 A CA417337 A CA 417337A CA 1199621 A CA1199621 A CA 1199621A
- Authority
- CA
- Canada
- Prior art keywords
- fluid
- impact mill
- milling
- stream
- milled
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
Abstract
ABSTRCT OF THE DISCLOSURE
IMPROVED MILL
A fluid energy impact mill including an injector to produce a stream of milling fluid containing particulate material to be milled and at least two milling surfaces with which the particulate material is impacted and which are positioned in a reflective path for the stream of fluid. More than two impact surfaces may be used. The impact mills have associated therewith means to separate the milled material from the milling fluid.
IMPROVED MILL
A fluid energy impact mill including an injector to produce a stream of milling fluid containing particulate material to be milled and at least two milling surfaces with which the particulate material is impacted and which are positioned in a reflective path for the stream of fluid. More than two impact surfaces may be used. The impact mills have associated therewith means to separate the milled material from the milling fluid.
Description
This invention relates to an improved mill and par-ticularly to a fluid energy impact mill.
Various aspects of the invention are as follows:
A fluid energy mill comprising an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path il the stream and both said impact mill surfaces being formed by a shaped : 10 portion of said walls of said milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, and separatior. means to separate the ~illed particulate material from the stream of milling fluid.
A method of milling a particulate material comprising:
(a) providing a fluid energy impact mill which comprises an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path in the stream and both of said impact mill surfaces being formed by a shaped portion of said walls of the milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, ~., ;i2~
-2a-and separation means to separate the milled par-ticulate material from the stream of milling fluid; and (b) feed-ing a mllling fluid thrc,ugh said injector to produce a stream of particulate material to be milled in said fluid, impacting said material with said first impact mill surface, reflecting said stream from said first impact mill surface to said second impact mill surface, and subsequently separating milled material from said fluid with said separation means.
A fluid energy impact mill in eccordance with the invention is useful for reducing the particle size of powders such as inorganic or organic pigment, drugs or other chemicals and products which are produced in a finely divided form. The invention is of particular use in mill-ing inorganic products such as titanium dioxide pigments titanium phosphate pigments, silica pigments, aluminium pigments, barium pigments, calcium pigments, carbon black, iron pigments, lead pigments and magnesium pigments, amongst others. The pigments may be coloured inorganic or organic pigments and if clesired the mill may be used for other opacifiers or fillers.
In the fluid energy mill there is produced a stream of the particulate material to be milled in a milling fluid.
The stream having a sufficiently high velocity is directed to a first impact mill surface where impact effects the first milling stage and thence to a second impact mill surface where milling is further continued.
6~
Tb effec~ the l.~"~r,-r frcm the first impact mill s17rf;7~ to the seoond surface it is nP~.S.s~7ry for the two mil.ing surXaces to be lW ~l~d in a reflective path for the str~m carrying the particulate material so that the stream is reflected from the first milled surface to the second and then oe ~urther Ul,o~yh the m;ll;ng ~kdLdLw. If ~7~sire~, the fluid energy i~pact mill cxmsLL~ed in a~ Jl~k~oe with the present invention may be provided with more than tw~ impact rnill s~lrfA~Ps proYiding that the sllrfA~s are ~rl~nl~cl in a cnntlm mus reflective path to 10 effect ~1~ ~Ler of the particulate mAtPr;Al cArr;~ ~y the stream of mL~ing fluid sl~c~ ;vely to the impact mill ylrf~P~.
Normally hc~aver t~e impact mill c..~ c~ed in ac~v.~lw with the invention will ;n~ two impact. mill ~lrf~re.~ mountea as ~.c~r;hed. ~he impact mill s-lrfare may be formed by a particular shapad portion of the wall of the mill~g rh~mhPr and may ke formed of the same mA~Pr~Al as the wall of the m;11;n~ r ~ or al~er.nati~aly, the impact mill surface may be formed of a diL~ L mat~rial than the wall of the m~ll;ng ~hamh~ but form part of the wall. If desired the .~mpact mill 20 s-lrfA~e need not form part of the wall and can ke s~aL.~Le ~ L~ . Ihe particular material ot ~l~ h ~Lion of the i~pact mill ~lr~ArP will depend on the particular particulate material to be milled. Since it is.~.qq;hl~ that the impact mill ~urface will suffer erosion during use it would be undesirable to 25 uLqe a material of c~ ~Lr~cLion which w~uld c~n~m~nAte the milled particulate material and thus it ls ~S;rAhl~ that the imPact mill ~uLL.~ is ~ormed either of a material which will suffer ~xLl~ly little ahrasive exosion or to be formed of a mat_rial which when ~hr~;~P~ does not objec~;~n~hly contaminate the milled product. In suitable cases the impact mill surface may be formed of s~nlP~s steel or other sultable relativel~ hard ~etal or may be formLd o~ a suitable Cpr~m;~
matexial.
Usually the particulate material to be milled is fed cross-~u~L~lLly into a stream of m~ n~ fluid sl~pli~ to the mill U~yll an injector at the reouired velocity and ~l~s~ur~O
10 me velocity may be sonic and yL~aLeL if desired. Ihe m;ll~n~
fluid produces a stream of the part;~ll~t~ m~aterial in the mlll;n~ ~h~mhPr and after con~act wlth ~he impact mill surfaces it is nPc~ss~ry to se~dLdLe the milled ~Lo~U~t fr~m the stream of m;ll;n~ fluid ky any suitable means. For instance the stream of 15 milled part;~ll~tp matexial may be fed to an P~n~1~n chamber or a series of P~pun~;~n ~h~ where the velccity of the stxeam is ~ul~yr~ively re~ e~ and then oe to a bag filter or otller suitable ~ r~t;,~n device to collect the milled product frcm the stream of m;ll;n~ fluid. Alternatively the produ~t 20 after m;ll;n~ may be fed to a cyclone where s~dldLion of the constituent mQlled product occurs. I~ n~ .y a f~r~her su~ply of the m;ll;n~ fluia may be fed into ~he stream of ground particula~e material prior to e~trv into an ~X~n~ n cha~ker or series of ~h~mhPr~ or a cyclone to dilute the strean and to assist removal of the par~iculate material from the product fluid streanO
'Lhe milling fl~id used in the fluid energy im-pact ~ill of the present invention usually will be a gas or vapour which is ~u~ lly inert to the m~tPr;~l to be m~illed. Suitable ydseuu~
m;ll;n~ fluids are air, oxygen, nitrogen and other inert gases and ste~m in d~ L~r l~te cases. If ~;re.~ a ~re~ing agent for the paL~ te mater;~1 may be in~L~ d with the ml11;ng fiuld to surfa oe treat the par~ lA~ mate,rl~l during mllling and such ~L~Li can be slrrfa~t~nt.~ or other surface mcdlfying agents which interact with the surfa oe of the particulate mater~l at the 10 a~yLr~ p milling ~ y ~ s .
Usually but not n~cP.c.~rlly m;lllng of the particulate material employing a fluid energy mill con3LLu~ked in a~ wL~kul~ with the inventio~ is cArrled out at an elevated l~"'L~ and part;~llArly when employing steam this will depend on the ~'~S~Ul~ of the s~eam used to produce the stream of miDing fluid carrying the particulate m~tPr~
One form of ~uid eneryy impact mill consLlu~Led in accordance with the invention will now ~e described by way of example only with rPfPrPnr.e to the ~ ~llylng ~7.ra~nq which is a diayL~,~ lc ~0 ~[~r~lll At; ~n of the mill.
The fluid energy impact mill 1 1n~ 7~s an elQngated m711;ng cha ~ ~r 2 into which there is fed a s~ream of the particulate ma-terial to be milled from a hopper 3 in a m71l1n~ fluid sl~rl~ by inlet 4 and v~ntuxi 5. m e mill has a pair of impactnil.1 surfaces 6 and 7 formed by shArin~ the walls of the mill 1 and in a se~rAt~ section 8.
An outlet 9 is provided which connects witll _n ~ c1on chamber lO
of increasing diameter to which is attached a collection bag ll.
Between the end of the mill l and the first P~T~n.qinn ~lL~L
are inlets 12 for further supply of fluid cGmpatible wlth the m;lling fluld to ke used as indicated at 13.
In use m;11;ng fluid is ~ed to the mill Lhl~uy~l inlet 4 and venturi 5 and forms a stream in the m;11;n~ .-3,~"a~, 2 of the particulate mA~PriAl to be milled which is directed bcwards the impact ~"~r~e 6. After ccntacting the surfaoe 6 the material is reflected fram the sl1ffAcP on to 5l1r$A~x 7 and then to outlet 9. n;1u~;nn of the stream is effected by su~plying a further amount of oompatible fluid 13 prior to pAqs~e of the stream of milled par~1~11AtQ mAtPr~A1 into P~T~n.q~n ~h~m~Pr 10.
The milled material is collected in the bag ll which is porous to the ~Pal~ m;11;ng fluid used.
In the following hx~mr1Ps there ~æ used a fluid energy impact mill constructed ~u~ "l;A11y as shcwn in ~he drawlng in which chamker 2 had a diameter of 0.5 cms and impact ~lrfA~e 6 and 7 had an area 2.25 sq cms was sur~ ith a strean of titanium ~;~x;~ pigment in nitrogen.
20 F'X;: T~1 P
Nitrogen was f~d to the mill L1~L~UY1~ LULi 5 and the nltxogen ;n;~;~lly had a Ir~~ Yr~ re of 600C and a ~JL~S~u~ of 10 Xg/om . '~he amoun~ of nlg~Pnt fed to the m~lltn~ "l1~, was 10 K grams per hour and the a~ount of nitnogen was lO K grams ~er .
hour. An amount of cold air was fed ~W~I inlets 12 m an amount of lO K grams per 'hour and the mille~ titanium ~x1~P
p~gmPnt collect~d in the bag ~l.
~9~
~he ~Lr~lucL obtained exhihited a satisfacto~y degree of m; 1 1 ; ng .
Example 2 FxAm~l~ 1 was re~A~r~d except that 10.8 Kg/hr of tit~nium ~;~x;~ pigment was fed to the mill and nitrogen was simulL~levu~ly ~ed to the mill at a ra~e of 15.7 Kg/hr at a ~ Ldt~L~ of 200&
And a ~r~s~uLe of 15 Kg/cm2.
The milled titanium ~ P pigment~ collected in bag 11, was found to have a satisfactory degree of m;lllng.
10 ~;~XAt'll~ 3 F~mrle 1 ~as repeated exoept that 11.4 ~g/hr of titanium e p;g~Pn~ ~as fed to the mill and nitrogen was simultAnPml~]y fed to the mill at a rate of 13.1 Kg/hr at a ~ dLule of ~00C and a ~ressure of 15 Kg~cm2.
~he milled titanium ~;~x;~P p;~rPn~. was fourd to have a satisfactory degree of m; 1 1; ng .
FrAm~lP 4 F~AmrlP 1 waS L~ed~d except that 9.3 K~/hr of titanium ~;~;~P pig~ent was fed to the m;lllng ~hAmhPr and nitrogen ~as simultanevusly ~ed to the mill at a rate of 6.1 Kg/hr at a tempeLdL~l~ of 600C and a pressure of 7 Kg/cm2.
Ihe milled tit~nium ~ P pigment ~as found to have a satisfactory degree of m;11;n~.
Various aspects of the invention are as follows:
A fluid energy mill comprising an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path il the stream and both said impact mill surfaces being formed by a shaped : 10 portion of said walls of said milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, and separatior. means to separate the ~illed particulate material from the stream of milling fluid.
A method of milling a particulate material comprising:
(a) providing a fluid energy impact mill which comprises an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path in the stream and both of said impact mill surfaces being formed by a shaped portion of said walls of the milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, ~., ;i2~
-2a-and separation means to separate the milled par-ticulate material from the stream of milling fluid; and (b) feed-ing a mllling fluid thrc,ugh said injector to produce a stream of particulate material to be milled in said fluid, impacting said material with said first impact mill surface, reflecting said stream from said first impact mill surface to said second impact mill surface, and subsequently separating milled material from said fluid with said separation means.
A fluid energy impact mill in eccordance with the invention is useful for reducing the particle size of powders such as inorganic or organic pigment, drugs or other chemicals and products which are produced in a finely divided form. The invention is of particular use in mill-ing inorganic products such as titanium dioxide pigments titanium phosphate pigments, silica pigments, aluminium pigments, barium pigments, calcium pigments, carbon black, iron pigments, lead pigments and magnesium pigments, amongst others. The pigments may be coloured inorganic or organic pigments and if clesired the mill may be used for other opacifiers or fillers.
In the fluid energy mill there is produced a stream of the particulate material to be milled in a milling fluid.
The stream having a sufficiently high velocity is directed to a first impact mill surface where impact effects the first milling stage and thence to a second impact mill surface where milling is further continued.
6~
Tb effec~ the l.~"~r,-r frcm the first impact mill s17rf;7~ to the seoond surface it is nP~.S.s~7ry for the two mil.ing surXaces to be lW ~l~d in a reflective path for the str~m carrying the particulate material so that the stream is reflected from the first milled surface to the second and then oe ~urther Ul,o~yh the m;ll;ng ~kdLdLw. If ~7~sire~, the fluid energy i~pact mill cxmsLL~ed in a~ Jl~k~oe with the present invention may be provided with more than tw~ impact rnill s~lrfA~Ps proYiding that the sllrfA~s are ~rl~nl~cl in a cnntlm mus reflective path to 10 effect ~1~ ~Ler of the particulate mAtPr;Al cArr;~ ~y the stream of mL~ing fluid sl~c~ ;vely to the impact mill ylrf~P~.
Normally hc~aver t~e impact mill c..~ c~ed in ac~v.~lw with the invention will ;n~ two impact. mill ~lrf~re.~ mountea as ~.c~r;hed. ~he impact mill s-lrfare may be formed by a particular shapad portion of the wall of the mill~g rh~mhPr and may ke formed of the same mA~Pr~Al as the wall of the m;11;n~ r ~ or al~er.nati~aly, the impact mill surface may be formed of a diL~ L mat~rial than the wall of the m~ll;ng ~hamh~ but form part of the wall. If desired the .~mpact mill 20 s-lrfA~e need not form part of the wall and can ke s~aL.~Le ~ L~ . Ihe particular material ot ~l~ h ~Lion of the i~pact mill ~lr~ArP will depend on the particular particulate material to be milled. Since it is.~.qq;hl~ that the impact mill ~urface will suffer erosion during use it would be undesirable to 25 uLqe a material of c~ ~Lr~cLion which w~uld c~n~m~nAte the milled particulate material and thus it ls ~S;rAhl~ that the imPact mill ~uLL.~ is ~ormed either of a material which will suffer ~xLl~ly little ahrasive exosion or to be formed of a mat_rial which when ~hr~;~P~ does not objec~;~n~hly contaminate the milled product. In suitable cases the impact mill surface may be formed of s~nlP~s steel or other sultable relativel~ hard ~etal or may be formLd o~ a suitable Cpr~m;~
matexial.
Usually the particulate material to be milled is fed cross-~u~L~lLly into a stream of m~ n~ fluid sl~pli~ to the mill U~yll an injector at the reouired velocity and ~l~s~ur~O
10 me velocity may be sonic and yL~aLeL if desired. Ihe m;ll~n~
fluid produces a stream of the part;~ll~t~ m~aterial in the mlll;n~ ~h~mhPr and after con~act wlth ~he impact mill surfaces it is nPc~ss~ry to se~dLdLe the milled ~Lo~U~t fr~m the stream of m;ll;n~ fluid ky any suitable means. For instance the stream of 15 milled part;~ll~tp matexial may be fed to an P~n~1~n chamber or a series of P~pun~;~n ~h~ where the velccity of the stxeam is ~ul~yr~ively re~ e~ and then oe to a bag filter or otller suitable ~ r~t;,~n device to collect the milled product frcm the stream of m;ll;n~ fluid. Alternatively the produ~t 20 after m;ll;n~ may be fed to a cyclone where s~dldLion of the constituent mQlled product occurs. I~ n~ .y a f~r~her su~ply of the m;ll;n~ fluia may be fed into ~he stream of ground particula~e material prior to e~trv into an ~X~n~ n cha~ker or series of ~h~mhPr~ or a cyclone to dilute the strean and to assist removal of the par~iculate material from the product fluid streanO
'Lhe milling fl~id used in the fluid energy im-pact ~ill of the present invention usually will be a gas or vapour which is ~u~ lly inert to the m~tPr;~l to be m~illed. Suitable ydseuu~
m;ll;n~ fluids are air, oxygen, nitrogen and other inert gases and ste~m in d~ L~r l~te cases. If ~;re.~ a ~re~ing agent for the paL~ te mater;~1 may be in~L~ d with the ml11;ng fiuld to surfa oe treat the par~ lA~ mate,rl~l during mllling and such ~L~Li can be slrrfa~t~nt.~ or other surface mcdlfying agents which interact with the surfa oe of the particulate mater~l at the 10 a~yLr~ p milling ~ y ~ s .
Usually but not n~cP.c.~rlly m;lllng of the particulate material employing a fluid energy mill con3LLu~ked in a~ wL~kul~ with the inventio~ is cArrled out at an elevated l~"'L~ and part;~llArly when employing steam this will depend on the ~'~S~Ul~ of the s~eam used to produce the stream of miDing fluid carrying the particulate m~tPr~
One form of ~uid eneryy impact mill consLlu~Led in accordance with the invention will now ~e described by way of example only with rPfPrPnr.e to the ~ ~llylng ~7.ra~nq which is a diayL~,~ lc ~0 ~[~r~lll At; ~n of the mill.
The fluid energy impact mill 1 1n~ 7~s an elQngated m711;ng cha ~ ~r 2 into which there is fed a s~ream of the particulate ma-terial to be milled from a hopper 3 in a m71l1n~ fluid sl~rl~ by inlet 4 and v~ntuxi 5. m e mill has a pair of impactnil.1 surfaces 6 and 7 formed by shArin~ the walls of the mill 1 and in a se~rAt~ section 8.
An outlet 9 is provided which connects witll _n ~ c1on chamber lO
of increasing diameter to which is attached a collection bag ll.
Between the end of the mill l and the first P~T~n.qinn ~lL~L
are inlets 12 for further supply of fluid cGmpatible wlth the m;lling fluld to ke used as indicated at 13.
In use m;11;ng fluid is ~ed to the mill Lhl~uy~l inlet 4 and venturi 5 and forms a stream in the m;11;n~ .-3,~"a~, 2 of the particulate mA~PriAl to be milled which is directed bcwards the impact ~"~r~e 6. After ccntacting the surfaoe 6 the material is reflected fram the sl1ffAcP on to 5l1r$A~x 7 and then to outlet 9. n;1u~;nn of the stream is effected by su~plying a further amount of oompatible fluid 13 prior to pAqs~e of the stream of milled par~1~11AtQ mAtPr~A1 into P~T~n.q~n ~h~m~Pr 10.
The milled material is collected in the bag ll which is porous to the ~Pal~ m;11;ng fluid used.
In the following hx~mr1Ps there ~æ used a fluid energy impact mill constructed ~u~ "l;A11y as shcwn in ~he drawlng in which chamker 2 had a diameter of 0.5 cms and impact ~lrfA~e 6 and 7 had an area 2.25 sq cms was sur~ ith a strean of titanium ~;~x;~ pigment in nitrogen.
20 F'X;: T~1 P
Nitrogen was f~d to the mill L1~L~UY1~ LULi 5 and the nltxogen ;n;~;~lly had a Ir~~ Yr~ re of 600C and a ~JL~S~u~ of 10 Xg/om . '~he amoun~ of nlg~Pnt fed to the m~lltn~ "l1~, was 10 K grams per hour and the a~ount of nitnogen was lO K grams ~er .
hour. An amount of cold air was fed ~W~I inlets 12 m an amount of lO K grams per 'hour and the mille~ titanium ~x1~P
p~gmPnt collect~d in the bag ~l.
~9~
~he ~Lr~lucL obtained exhihited a satisfacto~y degree of m; 1 1 ; ng .
Example 2 FxAm~l~ 1 was re~A~r~d except that 10.8 Kg/hr of tit~nium ~;~x;~ pigment was fed to the mill and nitrogen was simulL~levu~ly ~ed to the mill at a ra~e of 15.7 Kg/hr at a ~ Ldt~L~ of 200&
And a ~r~s~uLe of 15 Kg/cm2.
The milled titanium ~ P pigment~ collected in bag 11, was found to have a satisfactory degree of m;lllng.
10 ~;~XAt'll~ 3 F~mrle 1 ~as repeated exoept that 11.4 ~g/hr of titanium e p;g~Pn~ ~as fed to the mill and nitrogen was simultAnPml~]y fed to the mill at a rate of 13.1 Kg/hr at a ~ dLule of ~00C and a ~ressure of 15 Kg~cm2.
~he milled titanium ~;~x;~P p;~rPn~. was fourd to have a satisfactory degree of m; 1 1; ng .
FrAm~lP 4 F~AmrlP 1 waS L~ed~d except that 9.3 K~/hr of titanium ~;~;~P pig~ent was fed to the m;lllng ~hAmhPr and nitrogen ~as simultanevusly ~ed to the mill at a rate of 6.1 Kg/hr at a tempeLdL~l~ of 600C and a pressure of 7 Kg/cm2.
Ihe milled tit~nium ~ P pigment ~as found to have a satisfactory degree of m;11;n~.
Claims (13)
1. A fluid energy mill comprising an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path in the stream and both said impact mill surfaces being formed by a shaped portion of said walls of said milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, and separation means to separate the milled particulate material from the stream of milling fluid.
2. A fluid enery impact mill according to claim 1 in which each impact mill surface is formed of a material different from that of the wall of the milling chamber.
3. A fluid energy impact mill according to claim 1 in which the impact mill surface is formed of stainless steel.
4. A fluid energy impact mill according to claim 1 in which the impact mill surface is formed of a ceramic material.
5. A fluid energy impact mill according to claim 1 in which said separation means comprises an expansion chamber and a filter.
6. A fluid energy impact mill according to claim 1 in which said separation means comprises a cyclone.
7. A method of milling a particulate material comprising:
(a) providing a fluid energy impact mill which comprises an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path in the stream and both of said impact mill surfaces being formed by a shaped portion of said walls of the milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, and separation means to separate the milled particulate material from the stream of milling fluid; and (b) feeding a milling fluid through said injector to produce a stream of particulate material to be milled in said fluid, impacting said material with said first impact mill surface, reflecting said stream from said first impact mill surface to said second impact mill surface, and subsequently separating milled material from said fluid with said separation means.
(a) providing a fluid energy impact mill which comprises an injector to produce in a milling chamber having walls a stream of particulate material to be milled in a milling fluid, a first impact mill surface and a second impact mill surface in said chamber and arranged in a reflective path in the stream and both of said impact mill surfaces being formed by a shaped portion of said walls of the milling chamber so that particulate material to be milled impinges on said first impact mill surface and is reflected therefrom to said second impact mill surface, and separation means to separate the milled particulate material from the stream of milling fluid; and (b) feeding a milling fluid through said injector to produce a stream of particulate material to be milled in said fluid, impacting said material with said first impact mill surface, reflecting said stream from said first impact mill surface to said second impact mill surface, and subsequently separating milled material from said fluid with said separation means.
8. A method according to claim 7 in which the milling fluid is fed through the injector to produce a stream of fluid having a velocity which is at least sonic velocity.
9. A method according to claim 7 in which the particulate material is pigmentary titanium dioxide.
10. A method according to claim 7 in which after milling the stream of milling fluid carrying the milled particulate material is fed to separation means selected from the group consisting of an expansion chamber and a cyclone.
11. A method according to claim 10 in which a further supply of the milling fluid is fed into said stream prior to said separation means.
12. A method according to claim 7 in which said milling fluid is nitrogen.
13. A method according to claim 7 in which said milling fluid is steam.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB81/37395 | 1981-12-11 | ||
| GB8137395 | 1981-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1199621A true CA1199621A (en) | 1986-01-21 |
Family
ID=10526540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417337A Expired CA1199621A (en) | 1981-12-11 | 1982-12-09 | Mill |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS58104642A (en) |
| AU (1) | AU554247B2 (en) |
| CA (1) | CA1199621A (en) |
| DE (1) | DE3245446A1 (en) |
| ES (1) | ES518067A0 (en) |
| FI (1) | FI824246L (en) |
| FR (1) | FR2517986B1 (en) |
| GB (1) | GB2111855B (en) |
| ZA (1) | ZA828507B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8628586D0 (en) * | 1986-11-29 | 1987-01-07 | Tioxide Group Plc | Mill |
| GB8720904D0 (en) * | 1987-09-05 | 1987-10-14 | Tioxide Group Plc | Mill |
| FI83330C (en) * | 1988-06-03 | 1991-06-25 | Neste Oy | Process for activating a polymerization catalyst support and a catalyst component obtained by the process |
| DE3905354C2 (en) * | 1989-02-22 | 2000-02-10 | Reinhold A Brunke | Device for crushing liposomes |
| US5281379A (en) * | 1989-04-05 | 1994-01-25 | Kanebo, Ltd. | Processes for manufacturing thermoplastic resin compositions |
| GB8913819D0 (en) * | 1989-06-15 | 1989-08-02 | Tioxide Group Plc | Shaped articles |
| JPH03288557A (en) * | 1990-04-04 | 1991-12-18 | Asahi Chem Ind Co Ltd | Manufacture of fine granular powder of oxidizer |
| JPH07500524A (en) * | 1991-08-15 | 1995-01-19 | パルテック・コンクリート・リミテッド | Crushing and crushing method |
| GB9226994D0 (en) * | 1992-12-24 | 1993-02-17 | Tioxide Group Services Ltd | Method of milling |
| CN103386353A (en) * | 2012-05-07 | 2013-11-13 | 南京理工大学 | Device for jet milling of viscous material and gathering of dust |
| CN103182343A (en) * | 2013-03-14 | 2013-07-03 | 安徽省虹升生物科技有限公司 | Material outlet of materail grinding machine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1001569B (en) * | 1957-01-24 | Ruhrgas Aktiengesellschaft, Essen | Device for impact crushing of solid materials | |
| US1597656A (en) * | 1925-08-21 | 1926-08-24 | Willis H Botsford | Pulverizing device |
| US2175457A (en) * | 1936-11-19 | 1939-10-10 | Vanadium Corp Of America | Preferential pneumatic grinding and scrubbing of ores and minerals |
| DE2738980A1 (en) * | 1977-08-30 | 1979-03-08 | Friedhelm Kaufmann | Mineral comminution system - with suction-induced particle projection against series of baffle plates |
-
1982
- 1982-11-10 GB GB08232116A patent/GB2111855B/en not_active Expired
- 1982-11-18 AU AU90688/82A patent/AU554247B2/en not_active Ceased
- 1982-11-18 ZA ZA828507A patent/ZA828507B/en unknown
- 1982-12-08 DE DE19823245446 patent/DE3245446A1/en not_active Ceased
- 1982-12-09 CA CA000417337A patent/CA1199621A/en not_active Expired
- 1982-12-10 FI FI824246A patent/FI824246L/en not_active Application Discontinuation
- 1982-12-10 JP JP57215657A patent/JPS58104642A/en active Pending
- 1982-12-10 ES ES518067A patent/ES518067A0/en active Granted
- 1982-12-10 FR FR8220791A patent/FR2517986B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2517986B1 (en) | 1986-08-22 |
| FI824246L (en) | 1983-06-12 |
| ES8404876A1 (en) | 1984-05-16 |
| FI824246A0 (en) | 1982-12-10 |
| FR2517986A1 (en) | 1983-06-17 |
| JPS58104642A (en) | 1983-06-22 |
| GB2111855A (en) | 1983-07-13 |
| ES518067A0 (en) | 1984-05-16 |
| GB2111855B (en) | 1985-01-03 |
| AU9068882A (en) | 1983-06-16 |
| DE3245446A1 (en) | 1983-06-23 |
| AU554247B2 (en) | 1986-08-14 |
| ZA828507B (en) | 1983-09-28 |
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