Mining Industries
Based on various kinds of requirements, various grinding principals are applied and different kinds of mills are used in mining industry.
Rod Mill
A rotating drum causes friction and attrition between steel rods and ore particles. Rod mills are less common than ball mills for grinding minerals.
Ball Mill
Ball Mills are typically used in secondary grinding, after the primary grinding in AG/ SAG Mills.
AG/ Autogenous Mill
Autogenous or autogenic mills are so-called due to the self-grinding of the ore a rotating drum throws larger rocks of ore in a cascading motion which causes impact breakage of larger rocks and compressive grinding of finer particles. It is similar in operation to a SAG Mill as described below but does not use steel balls in the mill. Also known as ROM or “Run of Mine” Grinding.
SAG Mill
SAG is an acronym for Semi-Autogenous Grinding. SAG mills are essentially Autogenous mills, but utilize Grinding Balls to aid in grinding like in a Ball Mill. A SAG Mill is generally used as a primary or first stage grinding solution.
In all the above kinds of mills, we supply Liners, Discharge Diaphragms and Grinding Balls.
GRINDING MEDIA BALLS & CYLPEBS
Hyper Steel Grinding Media Balls
High Chrome Grinding Media Balls
Cylpebs
Conventionally, grinding media was made of cast iron, cast steel and even through forged process. However, Hyper Steel grinding media has surpassed the conventionally produced grinding media in terms of performance. A minimum 50% reduction in wear rate is expected over conventional grades. SBMI is one of the highest suppliers of quality hyper steel grinding media and castings.
Benefits To SBMI Customers
- High productivity/Increase output
- Consistent mill performance
- Lower inventory
- Reduced top-up frequency
- No-damage to Liners
- Span between re-grading increases
Advantages Of SBMI Media
- Increase output of mill
- Consistent mill performance
- Lowest wear rates
- Lesser breakage
- Lesser de-shaping rate
Quality Control At SBMI
- Lot wise continuous quality check
- Specifications of high standard as per IS
- Complete cycle of heat treatment process
- Uniform hardness throughout
| Size | Weight (in kgs) |
|---|---|
| Ball Ø 17 | 0.021 |
| Ball Ø 20 | 0.033 |
| Ball Ø 25 | 0.065 |
| Ball Ø 30 | 0.113 |
| Ball Ø 40 | 0.268 |
| Ball Ø 50 | 0.523 |
| Size | Weight (in kgs) |
|---|---|
| Ball Ø 60 | 0.904 |
| Ball Ø 70 | 1.436 |
| Ball Ø 80 | 2.144 |
| Ball Ø 90 | 3.050 |
| Ball Ø 100 | 4.189 |
| Ball Ø 125 | 8.179 |
Hyper Steel Grinding Media Balls
| Alloys | 100-60 mm | 50-20 mm |
|---|---|---|
| Carbon | 1.25 – 1.50% | 1.60 – 1.90% |
| Silicon | 1.00 % max | 1.00 % max |
| Manganese | 1.25 – 1.50 % | 1.25 – 1.50 % |
| Chromium | 1.50 – 2.00 % | 1.50 – 2.00 % |
| Sulphur | 0.06 % max. | 0.06 % max. |
| Phosphorus | 0.06 % max. | 0.06 % max. |
| Nickel | – | – |
| Molybdenum | 0.06 % max. | 0.06 % max. |
| Hardness | 375-415 BHN | 375-415 BHN |
High Chrome Grinding Media Balls
Alloy Composition For High Chrome Media
High Chrome Grinding Media are manufactured by us confirming to following specifications as per IS 6079/1989 against specific requirements of customers.
| Alloys | Hard 12 (50 mm Ø & below) | Hard 15 | Tough 17 (60 mm Ø & above) | Tough 21 |
|---|---|---|---|---|
| Carbon | 2.1% to 3.5% | 2.5% to 3.5% | 2.1% to 2.6% | 2.5% to 3.5% |
| Silicon | 0.8% max. | 0.8% max. | 0.8% max. | 0.8% max. |
| Manganese | 1.0% max. | 1.0% max. | 1.0% max. | 1.0% max. |
| Chromium | 11.0% to 14.0% | 14.0% to 16.0% | 15.5% to 18% | 20% to 22% |
| Sulphur & Phos | 0.06% max. | 0.06 % max. | 0.06 % max. | 0.06 % max. |
| Nickel | 0.5% max. | 0.5% max. | 0.5% max. | 0.5% max. |
| Molybdenum | 0.4% max. | 0.4% max. | 0.4% max. | 0.4% max. |
| Hardness | 62 HRC min. | 63 HRC min. | 60 HRC min. | 60 HRC min. |
| Heat treatment | Oil quenched | Oil quenched | Oil quenched & tempered | Oil quenched & tempered |
LINERS & DAIPHRAGMS
Liners & Diaphragms plays a vital role in the performance of the tube / horizontal mill. They mainly contribute in improving the grinding efficiency resulting in higher output from the mill.
SBMI has in place a very qualified team of personnel to design and deliver high quality Liners and Diaphragms with innovative technologies for superior performance of the mill.
Alloy Composition For High Chrome Media
| Chrome hard – 15 | Recommended for first chamber shell liners, head wall liners & partition diaphragm grate plates(50 mm Ø & below) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Alloys | C | Si | Mn | Cr | P | S | Ni | Mo | Hardness | |
| Minimum% | 0.90% | 0.30% | 0.70% | 12.00% | – | – | – | – | 55.0 HRc | |
| Maximum% | 1.40% | 0.80% | 1.20% | 15.00% | 0.05% | 0.05% | 0.01% | 0.50% | 58.0 HRc | |
| Hardness | Hardness is in the range of 55.0 to 58.0 HRc (561 to 615 BHN) | |||||||||
| Retained austenite | RA is restricted to 7.00% max. | |||||||||
| Micro structure | Micro structure is predominantly discontinuous chromium carbides in matrix of tempered martensite. Free graphite – Nil, Pearlite 1.00% max, Retained austenite – 7.00% max. | |||||||||
| Chrome hard – 25 | Recommended for second chamber shell liners, back wall liners & discharge diaphragm grate plate | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Alloys | C | Si | Mn | Cr | P | S | Ni | Mo | Hardness | |
| Minimum% | 2.00% | 0.30% | 0.70% | 22.00% | – | – | – | – | 57.0 HRc | |
| Maximum% | 3.30% | 0.80% | 1.20% | 28.00% | 0.05% | 0.05% | 0.01% | 0.50% | 62.0 HRc | |
| Hardness | Hardness is in the range of 57.0 to 62.0 HRc (595 to 690 BHN) | |||||||||
| Retained austenite | RA is restricted to 10.00% max. | |||||||||
| Micro structure | Micro structure is predominantly discontinuous chromium carbides in matrix of tempered martensite. Free graphite – Nil, Pearlite 1.00% max, Retained austenite – 10.00% max. | |||||||||
| Chrome hard – 2 | Recommended for first chamber shell liners, head wall liners & partition diaphragm grate plates | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Alloys | C | Si | Mn | Cr | P | S | Ni | Mo | Hardness | |
| Minimum% | 0.40% | 0.40% | 0.50% | 1.80% | – | – | – | 0.20% | 37.7 HRc | |
| Maximum% | 0.70% | 0.80% | 1.10% | 2.30% | 0.04% | 0.04% | 0.50% | 0.50% | 47.7 HRc | |
| Hardness | Hardness is in the range of 37.7 to 47.7 HRc (350 to 450 BHN) | |||||||||
| Retained austenite | RA is restricted to 10.00% max. | |||||||||
| Micro structure | Micro structure shall essentially contain tempered martensitic structure after heat treatment. Free graphite – Nil | |||||||||
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