AU625288B2 - Grinding media and method of grinding - Google Patents
Grinding media and method of grinding Download PDFInfo
- Publication number
- AU625288B2 AU625288B2 AU32501/89A AU3250189A AU625288B2 AU 625288 B2 AU625288 B2 AU 625288B2 AU 32501/89 A AU32501/89 A AU 32501/89A AU 3250189 A AU3250189 A AU 3250189A AU 625288 B2 AU625288 B2 AU 625288B2
- Authority
- AU
- Australia
- Prior art keywords
- grinding
- media
- grinding media
- shape
- diameter
- 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
- 238000000227 grinding Methods 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
Landscapes
- Crushing And Grinding (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
cc
AUSTRALIA
'Pll c')'k Patent Act CO0M P LET E SP EC I FIC AT
(ORIGINAL)
Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Pu1l dished: Priority: Related Art:
'A
APPLICANT'S REF: P.10569-Australia Name(s) of Applicant(s): FONDTOGAM (PROPRIETARY) LIMITED Address(es) Applicant(s):.
204 Nedhank Centre Corner Bordeaux Drive and Paris Road Randburg, Transvaal. Province SOUTH AFRICA Address for Service is-, PHILLIPS ORMONDE VITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street MELBOUR~NE, Austr~alia 3000 C. mplete Specification tot~ the invention entitled: GRINDING MEDIA (=VZv~ c The following qtatement is a full description of this invention, including the best method of performing it k~nown to applicant(s)? )0 4N1 "GRINDING MEDIA AND METHOD OF GRINDING" THIS INVENTION relates to hard grinding media in tube mills and a method of grinding.
The use of grinding media in the form of hard metal balls in tube mills has been in wide spread use for many years. Usually the balls are produced in a continuous casting operation which leaves an irregularity at the riser which is formed between contiguous balls.
#o00 9 9 '0 S 0 0 0 0 ao 2 I __,II 3 These balls, as is well known, work harden with the impacts which occur during grinding operations. This work hardening gives added life and effectiveness to the grinding media. However the balls are found in practice to wear into irregular shapes because the impact loading encountered during use does not provide uniform hardening of the balls. In particular where there is a flat on the surface of the ball, as may be caused by the formation of a riser as above referred to, this flat forms a soft spot where accentuated wear takes place.
*Once this type of wear takes place the irregular shapes formed results in interlocking which in turn prevents point contact between grinding media and prevents desired work hardening. This results in reduced performance in hardness and grinding efficiency.
It is the object of this invention to provide grinding media, which will at least reduce the disadvantages encountered with grinding balls above referred.
/According to According to this invention there is provided grinding media in the shape of hard metal components of generally circular cylindrical shape with rounded ends, in which the length of the cylindrical section is not less than substantially equal to its diameter.
The present invention also provides a method of grinding material, said method comprising: placing said material in a grinding vessel with grinding media in the shape of hard metal components of generally circular cylindrical shape with rounded ends, in which the length of the cylindrical section is not less than substantially equal to its diameter; and grinding said material with said grinding media.
3a
UB
4 media in the shape metal compionents of Crlyircular cylindricalhap w4th--r-ound-ed- e-nd-s-- Further features of this invention provide for the media to have generally hemispherical ends and a length of cylindrical section approximately the diameter of the cylinder.
It has been found in practice that the exact shape and proportions are not critical to the effectiveness of the media but the general shape defined has been found, for reasons that are presently unknown to the applicant, to result in media which reduces in use more uniformly than media of spherical shape and thus reduce costs or increase mill throughput or grinding efficiency or combinations of these.
The media lends itself to manufacture by known continuous casting processes but can be die cast if necessary.
The application of the media and materials used for its manufacture are substantially identical with that where /balls are balls are used in conventional tube mill operations.
Different milling conditions require different ratios of media to ore being ground, size of media, hardness and other variables. All of these are well known to those skilled in the art.
Similarly the actual composition of the media will be determined by those skilled in the art to give the appropriate grinding media for the particular application.
The invention provides grinding media which have been found to wear in a more uniform manner and maintain for longer than grinding characteristics than conventional balls.
MA/
Claims (6)
1. Grinding media in the shape of hard metal components of generally circular cylindrical shape with rounded ends, in which the length of the cylindrical section is not less than substantially equal to its diameter.
2. Grinding media as claimed in Claim 1 in which the ends are of generally hemispherical shape.
3. Grinding media as claimed in Claim 1 or Claim 2 in which the length of cylindrical section is approximately equal to the diameter of the cylinder.
4. A method of grinding material, said method comprising: placing said material in a grinding vessel with grinding media in the shape of hard metal components of generally circular cylindrical shape with rounded ends, in which the length of the cylindrical section is not less than substantially equal to its diameter; and grinding said material with said grinding media.
DATED: 3 April 1992 PHILLIPS ORMONDE FITZPATRICK Attorneys for: FONDTOGAM (PROPRIETARY) LIMITED9 3266Z
6-
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA88/2447 | 1988-04-08 | ||
| ZA882447 | 1988-04-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3250189A AU3250189A (en) | 1989-10-12 |
| AU625288B2 true AU625288B2 (en) | 1992-07-09 |
Family
ID=25579224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU32501/89A Expired AU625288B2 (en) | 1988-04-08 | 1989-04-06 | Grinding media and method of grinding |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU625288B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU431920B2 (en) * | 1968-01-12 | 1973-01-23 | Commonwealth Steel Company, Limited | Improvements in ball mills andin balls for use therein |
-
1989
- 1989-04-06 AU AU32501/89A patent/AU625288B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU431920B2 (en) * | 1968-01-12 | 1973-01-23 | Commonwealth Steel Company, Limited | Improvements in ball mills andin balls for use therein |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3250189A (en) | 1989-10-12 |
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