CA2175637A1 - Method of comminuting brittle material for grinding, particularly granulated blast furnace slag - Google Patents
Method of comminuting brittle material for grinding, particularly granulated blast furnace slagInfo
- Publication number
- CA2175637A1 CA2175637A1 CA002175637A CA2175637A CA2175637A1 CA 2175637 A1 CA2175637 A1 CA 2175637A1 CA 002175637 A CA002175637 A CA 002175637A CA 2175637 A CA2175637 A CA 2175637A CA 2175637 A1 CA2175637 A1 CA 2175637A1
- Authority
- CA
- Canada
- Prior art keywords
- grinding
- returned
- roll gap
- scabs
- blast furnace
- 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.)
- Abandoned
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
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/06—Selection or use of additives to aid disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
Abstract
The invention relates to a method of comminuting brittle material for grinding, particularly granulated blast furnace slag, i the roll gap of a material bed roll mill, wherein a part-quantity of the comminuted material for grinding is returned to the roll gap. In order to be able to influence the quality of the ground product quite specifically, the grain distribution produced in the grinding operation is brought to the desired value by adjustment of the quantity and the moisture content of the returned material for grinding.
Description
Method of comminutin~ brittle material for ~rindin~, particularly ~ranulated blast furnace sla~
The invention relates to a method of comminuting brittle material for grinding, particularly granulated blast furnace slag, in the grinding gap between two revolving rolls of a material bed roll mill which are pressed against one another with high pressure, according to the preamble to Claim 1.
It is already known from various publications, for example WORLD CEMENT, October 1993, pages 51 to 58, that in the production of blast furnace slag powders which are used in the production of blast furnace cement it is advantageous if the granulated blast furnace slag is ground separately from the cement clinker and optionally other admixed components in a material bed roll mill. This is advantageous above all when the proportion of ground blast furnace slag predominates in the blast furnace cement. In this separate grinding of granulate blast furnace slag the degree of fineness of the blast furnace slag powder to be produced can be freely selected and can be mixed with the separately comminuted cement clinker in the particular manner necessary in each case and in any proportions.
In the comminution of granulated blast furnace slag it should further be noted that the ground blast furnace slag powders are subject to the same quality requirements as the comminuted cement clinker, i.e. the same quality requirements apply for finished blast furnace cement as for Portland cement.
Accordingly for the comminution of granulated blast furnace slag to blast furnace slag powders for the production of blast furnace cement it is also important that a predetermined quality of the ground product, that is to say the blast furnace cement powder, is maintained. In this case, apart from other quality criteria the addition of water for standard stiffness plays an important role - as with cement - for the ~175637 processing properties to be expected. The addition of water or the water requirement is determined above all by the fineness or the specific surface and by the grain distribution in the finished product <blast furnace slag powder). If in this connection the grain distribution in the finished product is plotted as a curve in a diagram, then a relatively steep gradient indicates a comparatively narrow grain distribution and a relatively shallow gradient indicates a comparatively wide grain distribution. This grain distribution determines inter alia the flowing behaviour and the workability of the finished product ground for example from granulated blast furnace slag.
In the passage referred to above (WORLD CEMENT, October 1993, particularly pages 52 and 53) with the aid of a regression curve the grain distribution or grain size distribution as well as the tangent (straight trend line) calculated therefrom have already been explained with an inclination or a gradient figure n. In this case the knowledge is communicated that the gradient figure n of the grain distribution can be altered by returning to the material bed roll mill a part-quantity of the comminuted material for grinding which has been agglomerated into scabs and feeding this together with fresh material for grinding to the grinding gap.
However, more recent studies have shown that a desired alteration in the grain size distribution of the ground product cannot be achieved or can be achieved only incompletely by a recirculation of a quantity of scabs. The object of the invention, therefore, is to make further developments to a method of the type set out in the preamble to Claim 1 in such a way that a particularly specific alteration or adjustment of the grain distribution (grain size distribution) in the ground product can be achieved with a particularly high degree of reliability in a comparatively wide range.
217~637 This object is achieved according to the invention by the characterising feature of Claim 1.
Advantageous embodiments of the invention are the subject matter of the subordinate claims.
EP-A-O 527 333 disclosed inter alia that for the comminution of brittle material for grinding (particularly also granulated blast furnace slag) a part-stream of the comminuted material for grinding which is agglomerated to form scabs is returned together with tailings from a subsequent separation zone to the roll gap of a material bed roll mill and is further comminuted there with fresh material for grinding, and the total mill feed material made up of the fresh material for grinding and the returned material mixture can be adjusted at the inlet to the roll gap to a mixed moisture content of approximately 0.5 to 2.0%. The purpose of this known measure is to be seen, howe~er, in the fact that adjustment of the mixed moisture content creates on the one hand a particularly favourable scab production and on the other hand a particularly good nip capacity, and by the adjustment of the moisture the running behaviour of the rolls of this material bed roll mill should be positi~ely influenced in order for example to pre~ent material for grinding from being drawn in on one side and thus to pre~ent undesirable skewing of the rolls.
By contrast, it is proposed according to the invention that the grain distribution (or grain size distribution) produced according to the invention in the comminuted material for grinding is brought to the desired value by adjustment of the quantity and the moisture content of the material for grinding returned to the roll gap. Thus this means in other words that using the method according to the in~ention in the comminution of brittle material for grinding, particularly granulated blast furnace slag, in a material bed roll mill an alteration in the grain distribution and thus an influence on the product quality (abo~e all of ground blast furnace slag powder~ can be brought about very reliably and in the particular manner desired in each case by an adjustment both of the quantity (size of the part-quantity) and also of the moisture content of the material for grinding returned to the roll gap and thus also of the material for grinding within the roll gap.
In this comminution according to the invention the quantity of scabs returned to the roll gap is set to approximately 80% of the material for grinding fed to the roll gap and the moisture content of the material for grinding in the roll gap is set to at least approximately lX. In this case it has proved particularly advantageous if the quantity of returned scabs is set to approximately 50 to 70% of the material for grinding fed to the roll gap and the material for grinding in the roll gap is set to a moisture content of approximately 1 to 2%.
However, if necessary the moisture content can also be higher and can also for example be up to approximately 6X.
In the comminution of brittle material for grinding such as granulated blast furnace slag in a material bed roll mill it is generally known for a sec~nd part-quantity of the comminuted material for grinding which is agglomerated into scabs to be separated in a separator, particularly a high-capacity air separator, at least into fine material to be drawn off as finished product and into oversize material (so-called tailings) to be further comminuted.
In this method according to the invention it is again advantageous if the grain distribution of the second part-quantity to be delivered to the separator or of the finished product is determined, is represented graphically in a straight trend line which is calculated therefrom with a gradient figure as a statement of the width of this grain distribution and then this gradient figure is altered by the 217S~i ~'7 adjustment of the quantity of scabs returned to the roll gap and of the moisture content in the roll gap.
The straight trend line A is plotted in the accompanying diagram. In this diagram the various quantities of returned scabs are shown (in %) in the ordinate and the ~arious gradient figures or gradient factors are shown in the abscissa. This shows the influence of the quantity of scabs returned to the material bed roll mill on the gradient or inclination of the comminuted material for grinding. Thus it will be seen that for example with a gradient factor 1 the quantity of returned scabs is approximately 65 to 75~ with a gradient figure of 1.06 the quantity of returned scabs is approximately 35% whilst with 0X returned scabs the gradient figure is somewhat higher than 1.2. When this diagram was drawn up (with the so-called RRS Inclination ) the moisture content of the material for grinding was approximately 1 to 2%.
As may already be seen from page 52 of the aforementioned document (WORLD CEMENT October 1993) a regression curve may be calculated for the grain distribution the tangent of this regression cur~e being designated as inclination n as may be learnt from the paper by Smirnow in AUFBEREITUNGS-TECHNIK No.
6 1975 pages 308 to 314. This tangent corresponds to the pre~iously mentioned straight trend line with the gradient figure n which represents a statement as to the width of the grain distribution of the ground product. In this case it has proved particularly advantageous if the gradient figure n of the straight trend line can be altered in a range of approximately +/- 0.2 which in practice means a good possibility for influencing the grain distribution and thus also the product quality particularly of powder ground from granulated blast furnace slag. Basically it should again be emphasised that the fineness of the separator feed material (that is to say the second part-quantity of scabs) has a substantial influence on the gradient figure n of the finished product. Thus this means that a comparatively high fineness of the second part-quantity of comminuted material for grinding to be deli~ered to the separator leads to a relati~ely small gradient figure n of the finished product and vice versa. The fineness of the separator feed material is influenced by the quantity of scabs returned to the roll gap.
The more scabs are returned to the roll gap of the material bed roll mill, the more often this material for grinding is o~er-ground and the finer it becomes, i.e. by an alteration of the returned quantity of scabs the fineness of the separator feed material and thus finally also the gradient figure of the finished product is altered. It is a prerequisite for this, however, that the comminution of the material for grinding in the roll gap of the material bed roll mill is carried out with an adjustable minimum moisture content which amounts to preferably at least approximately 1%, but optionally for example can also be up to 4X, in special cases even up to 6%.
The comparati~e table set out below shows data for two examples, where Example I gives the data for a dry (0%
moisture content) granulated blast furnace slag and Example II
gives data for a moist granulated blast furnace slag with approximately 1 to 2% moisture content in the grinding gap.
In both examples, moreo~er, a specific part-quantity (proportion of 58% to 63.3%) of the total feed) of the comminuted material for grinding agglomerated into scabs was returned to the material bed roll mill and fed to the roll gap together with fresh material for grinding as well as a proportion of returned tailings from the separator. With otherwise the same comminuting conditions in the material bed roll mill, a lower fineness of the finished product was produced for Example I (dry) than in Example II (l to 2%
moisture content). In the calculation of a straight trend line from the grain distribution of the finished product a gradient figure n of 1.11 is produced for Example I, whilst in - 217~637 Example II, i.e. in the comminution of granulated blast furnace slag with a moisture content of 1 to 2%, the gradient figure n is 0.92. The comparati~ely high gradient figure of Example I means a narrow grain distribution, whiIst the gradient figure of Example II which is lower by comparison therewith represents a wider grain distribution, i.e. the fineness of the finished product is higher in Example II than in the comparative Example I.
COMPARATIVE TABLE
Examples I II
Moisture in the roll gap (%) 0 1 - 2 Total feed (t/h) 10.34 5.99 Fresh material (t/h) 0.844 0.89 Returned scabs (t/h) 6.0 3.79 = Proportion of total feed (%) 58 63.3 Returned tailings (t/h) 3.5 1.3 Fineness of the product as specific surface (cm2/g) 4235 4545 Gradient f igure n 1.11 0.92
The invention relates to a method of comminuting brittle material for grinding, particularly granulated blast furnace slag, in the grinding gap between two revolving rolls of a material bed roll mill which are pressed against one another with high pressure, according to the preamble to Claim 1.
It is already known from various publications, for example WORLD CEMENT, October 1993, pages 51 to 58, that in the production of blast furnace slag powders which are used in the production of blast furnace cement it is advantageous if the granulated blast furnace slag is ground separately from the cement clinker and optionally other admixed components in a material bed roll mill. This is advantageous above all when the proportion of ground blast furnace slag predominates in the blast furnace cement. In this separate grinding of granulate blast furnace slag the degree of fineness of the blast furnace slag powder to be produced can be freely selected and can be mixed with the separately comminuted cement clinker in the particular manner necessary in each case and in any proportions.
In the comminution of granulated blast furnace slag it should further be noted that the ground blast furnace slag powders are subject to the same quality requirements as the comminuted cement clinker, i.e. the same quality requirements apply for finished blast furnace cement as for Portland cement.
Accordingly for the comminution of granulated blast furnace slag to blast furnace slag powders for the production of blast furnace cement it is also important that a predetermined quality of the ground product, that is to say the blast furnace cement powder, is maintained. In this case, apart from other quality criteria the addition of water for standard stiffness plays an important role - as with cement - for the ~175637 processing properties to be expected. The addition of water or the water requirement is determined above all by the fineness or the specific surface and by the grain distribution in the finished product <blast furnace slag powder). If in this connection the grain distribution in the finished product is plotted as a curve in a diagram, then a relatively steep gradient indicates a comparatively narrow grain distribution and a relatively shallow gradient indicates a comparatively wide grain distribution. This grain distribution determines inter alia the flowing behaviour and the workability of the finished product ground for example from granulated blast furnace slag.
In the passage referred to above (WORLD CEMENT, October 1993, particularly pages 52 and 53) with the aid of a regression curve the grain distribution or grain size distribution as well as the tangent (straight trend line) calculated therefrom have already been explained with an inclination or a gradient figure n. In this case the knowledge is communicated that the gradient figure n of the grain distribution can be altered by returning to the material bed roll mill a part-quantity of the comminuted material for grinding which has been agglomerated into scabs and feeding this together with fresh material for grinding to the grinding gap.
However, more recent studies have shown that a desired alteration in the grain size distribution of the ground product cannot be achieved or can be achieved only incompletely by a recirculation of a quantity of scabs. The object of the invention, therefore, is to make further developments to a method of the type set out in the preamble to Claim 1 in such a way that a particularly specific alteration or adjustment of the grain distribution (grain size distribution) in the ground product can be achieved with a particularly high degree of reliability in a comparatively wide range.
217~637 This object is achieved according to the invention by the characterising feature of Claim 1.
Advantageous embodiments of the invention are the subject matter of the subordinate claims.
EP-A-O 527 333 disclosed inter alia that for the comminution of brittle material for grinding (particularly also granulated blast furnace slag) a part-stream of the comminuted material for grinding which is agglomerated to form scabs is returned together with tailings from a subsequent separation zone to the roll gap of a material bed roll mill and is further comminuted there with fresh material for grinding, and the total mill feed material made up of the fresh material for grinding and the returned material mixture can be adjusted at the inlet to the roll gap to a mixed moisture content of approximately 0.5 to 2.0%. The purpose of this known measure is to be seen, howe~er, in the fact that adjustment of the mixed moisture content creates on the one hand a particularly favourable scab production and on the other hand a particularly good nip capacity, and by the adjustment of the moisture the running behaviour of the rolls of this material bed roll mill should be positi~ely influenced in order for example to pre~ent material for grinding from being drawn in on one side and thus to pre~ent undesirable skewing of the rolls.
By contrast, it is proposed according to the invention that the grain distribution (or grain size distribution) produced according to the invention in the comminuted material for grinding is brought to the desired value by adjustment of the quantity and the moisture content of the material for grinding returned to the roll gap. Thus this means in other words that using the method according to the in~ention in the comminution of brittle material for grinding, particularly granulated blast furnace slag, in a material bed roll mill an alteration in the grain distribution and thus an influence on the product quality (abo~e all of ground blast furnace slag powder~ can be brought about very reliably and in the particular manner desired in each case by an adjustment both of the quantity (size of the part-quantity) and also of the moisture content of the material for grinding returned to the roll gap and thus also of the material for grinding within the roll gap.
In this comminution according to the invention the quantity of scabs returned to the roll gap is set to approximately 80% of the material for grinding fed to the roll gap and the moisture content of the material for grinding in the roll gap is set to at least approximately lX. In this case it has proved particularly advantageous if the quantity of returned scabs is set to approximately 50 to 70% of the material for grinding fed to the roll gap and the material for grinding in the roll gap is set to a moisture content of approximately 1 to 2%.
However, if necessary the moisture content can also be higher and can also for example be up to approximately 6X.
In the comminution of brittle material for grinding such as granulated blast furnace slag in a material bed roll mill it is generally known for a sec~nd part-quantity of the comminuted material for grinding which is agglomerated into scabs to be separated in a separator, particularly a high-capacity air separator, at least into fine material to be drawn off as finished product and into oversize material (so-called tailings) to be further comminuted.
In this method according to the invention it is again advantageous if the grain distribution of the second part-quantity to be delivered to the separator or of the finished product is determined, is represented graphically in a straight trend line which is calculated therefrom with a gradient figure as a statement of the width of this grain distribution and then this gradient figure is altered by the 217S~i ~'7 adjustment of the quantity of scabs returned to the roll gap and of the moisture content in the roll gap.
The straight trend line A is plotted in the accompanying diagram. In this diagram the various quantities of returned scabs are shown (in %) in the ordinate and the ~arious gradient figures or gradient factors are shown in the abscissa. This shows the influence of the quantity of scabs returned to the material bed roll mill on the gradient or inclination of the comminuted material for grinding. Thus it will be seen that for example with a gradient factor 1 the quantity of returned scabs is approximately 65 to 75~ with a gradient figure of 1.06 the quantity of returned scabs is approximately 35% whilst with 0X returned scabs the gradient figure is somewhat higher than 1.2. When this diagram was drawn up (with the so-called RRS Inclination ) the moisture content of the material for grinding was approximately 1 to 2%.
As may already be seen from page 52 of the aforementioned document (WORLD CEMENT October 1993) a regression curve may be calculated for the grain distribution the tangent of this regression cur~e being designated as inclination n as may be learnt from the paper by Smirnow in AUFBEREITUNGS-TECHNIK No.
6 1975 pages 308 to 314. This tangent corresponds to the pre~iously mentioned straight trend line with the gradient figure n which represents a statement as to the width of the grain distribution of the ground product. In this case it has proved particularly advantageous if the gradient figure n of the straight trend line can be altered in a range of approximately +/- 0.2 which in practice means a good possibility for influencing the grain distribution and thus also the product quality particularly of powder ground from granulated blast furnace slag. Basically it should again be emphasised that the fineness of the separator feed material (that is to say the second part-quantity of scabs) has a substantial influence on the gradient figure n of the finished product. Thus this means that a comparatively high fineness of the second part-quantity of comminuted material for grinding to be deli~ered to the separator leads to a relati~ely small gradient figure n of the finished product and vice versa. The fineness of the separator feed material is influenced by the quantity of scabs returned to the roll gap.
The more scabs are returned to the roll gap of the material bed roll mill, the more often this material for grinding is o~er-ground and the finer it becomes, i.e. by an alteration of the returned quantity of scabs the fineness of the separator feed material and thus finally also the gradient figure of the finished product is altered. It is a prerequisite for this, however, that the comminution of the material for grinding in the roll gap of the material bed roll mill is carried out with an adjustable minimum moisture content which amounts to preferably at least approximately 1%, but optionally for example can also be up to 4X, in special cases even up to 6%.
The comparati~e table set out below shows data for two examples, where Example I gives the data for a dry (0%
moisture content) granulated blast furnace slag and Example II
gives data for a moist granulated blast furnace slag with approximately 1 to 2% moisture content in the grinding gap.
In both examples, moreo~er, a specific part-quantity (proportion of 58% to 63.3%) of the total feed) of the comminuted material for grinding agglomerated into scabs was returned to the material bed roll mill and fed to the roll gap together with fresh material for grinding as well as a proportion of returned tailings from the separator. With otherwise the same comminuting conditions in the material bed roll mill, a lower fineness of the finished product was produced for Example I (dry) than in Example II (l to 2%
moisture content). In the calculation of a straight trend line from the grain distribution of the finished product a gradient figure n of 1.11 is produced for Example I, whilst in - 217~637 Example II, i.e. in the comminution of granulated blast furnace slag with a moisture content of 1 to 2%, the gradient figure n is 0.92. The comparati~ely high gradient figure of Example I means a narrow grain distribution, whiIst the gradient figure of Example II which is lower by comparison therewith represents a wider grain distribution, i.e. the fineness of the finished product is higher in Example II than in the comparative Example I.
COMPARATIVE TABLE
Examples I II
Moisture in the roll gap (%) 0 1 - 2 Total feed (t/h) 10.34 5.99 Fresh material (t/h) 0.844 0.89 Returned scabs (t/h) 6.0 3.79 = Proportion of total feed (%) 58 63.3 Returned tailings (t/h) 3.5 1.3 Fineness of the product as specific surface (cm2/g) 4235 4545 Gradient f igure n 1.11 0.92
Claims (6)
1. Method of comminuting brittle material for grinding, particularly granulated blast furnace slag, in the grinding gap between two revolving rolls of a material bed roll mill which are pressed against one another with high pressure, wherein a part-quantity of the comminuted material for grinding which is agglomerated into scabs is returned to the material bed roll mill and is fed together with fresh material for grinding to the roll gap, characterised in that the grain distribution produced in the grinding operation is brought to the desired value by adjustment of the quantity and the moisture content of the material for grinding which is returned to the roll gap.
2. Method as claimed in Claim 1, characterised in that the quantity of scabs returned to the roll gap is up to approximately 80% of the material for grinding fed to the roll gap and the moisture content of the material for grinding in the roll gap is set to at least approximately 1%.
3. Method as claimed in Claim 2, characterised in that the quantity of returned scabs is set to approximately 50 to 70%.
4. Method as claimed in Claim 2, characterised in that the material for grinding in the roll gap is set to a moisture content of approximately 1 to 2%.
5. Method as claimed in Claim 2, wherein a second part-quantity of the comminuted material for grinding which is agglomerated into scabs is separated in a separator at least into fine material to be drawn off as finished product and into oversize material, characterised in that - the grain distribution of the second part-quantity to be delivered to the separator or of the finished product is determined, - is represented in a straight trend line which is calculated therefrom with a gradient figure (n) as a statement of the width of this grain distribution, - and this gradient figure is altered by the adjustment of the quantity of returned scabs and of the moisture content in the roll gap.
6. Method as claimed in Claim 5, characterised in that the gradient figure (n) of the straight trend line can be altered in a range of approximately +/- 0.2,
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19522321.7 | 1995-06-20 | ||
| DE19522321A DE19522321A1 (en) | 1995-06-20 | 1995-06-20 | Process for crushing brittle regrind, in particular slag sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2175637A1 true CA2175637A1 (en) | 1996-12-21 |
Family
ID=7764765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002175637A Abandoned CA2175637A1 (en) | 1995-06-20 | 1996-05-02 | Method of comminuting brittle material for grinding, particularly granulated blast furnace slag |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0749782A1 (en) |
| AU (1) | AU5192496A (en) |
| BR (1) | BR9602330A (en) |
| CA (1) | CA2175637A1 (en) |
| DE (1) | DE19522321A1 (en) |
| ZA (1) | ZA963407B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013100997A1 (en) | 2013-01-31 | 2014-07-31 | Thyssenkrupp Resource Technologies Gmbh | 1; 2 Method and plant for grinding lumpy starting material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI821671A0 (en) * | 1981-06-02 | 1982-05-12 | Gen Communition Inc | MALNINGSFOERFARANDE |
| DE3921823A1 (en) * | 1989-07-03 | 1991-01-17 | Krupp Polysius Ag | METHOD AND APPARATUS FOR MINING GRINDING |
| DE4126899A1 (en) * | 1991-08-14 | 1993-02-18 | Krupp Polysius Ag | METHOD AND APPENDIX FOR CRUSHING SPROEDEM GRILLS |
| JP2719750B2 (en) * | 1993-11-13 | 1998-02-25 | 川崎重工業株式会社 | Particle size control device for vertical mill |
-
1995
- 1995-06-20 DE DE19522321A patent/DE19522321A1/en not_active Withdrawn
-
1996
- 1996-04-18 EP EP96106137A patent/EP0749782A1/en not_active Withdrawn
- 1996-04-29 AU AU51924/96A patent/AU5192496A/en not_active Abandoned
- 1996-04-30 ZA ZA963407A patent/ZA963407B/en unknown
- 1996-05-02 CA CA002175637A patent/CA2175637A1/en not_active Abandoned
- 1996-05-17 BR BR9602330-9A patent/BR9602330A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE19522321A1 (en) | 1997-01-02 |
| BR9602330A (en) | 1999-10-13 |
| AU5192496A (en) | 1997-01-09 |
| ZA963407B (en) | 1996-11-08 |
| EP0749782A1 (en) | 1996-12-27 |
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