Bond Rod Mill Work Index Calculator
Named rod-mill Bond test correlation with screen exponent.23 and grams/rev exponent.625, explicit protocol/tonne constant, unlike ball-mill .82 test or operating energy inverse. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
The rod-mill Bond test uses a protocol-specific correlation involving screen size and grams per revolution.
The rod-mill Bond test uses a protocol-specific correlation involving screen size and grams per revolution.1
The caller supplies the applicable constant and tonne basis.
When to use Bond Rod Mill Work Index Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
How to use Bond Rod Mill Work Index Calculator and understand its results
- Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
- Enter callerRodClosingScreenMicrons, observedRodGramsPerRevolution, observedRodFeedP80Microns, observedRodProductP80Microns, callerProtocolConstant, using the field meanings and rules below, then run the tool.
- Read protocolRodMillWorkIndex. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerRodClosingScreenMicrons | Caller rod closing screen microns | number | Required |
| observedRodGramsPerRevolution | Observed rod grams per revolution | number | Required |
| observedRodFeedP80Microns | Observed rod feed p80 microns | number | Required |
| observedRodProductP80Microns | Observed rod product p80 microns | number | Required |
| callerProtocolConstant | Caller protocol constant | number | Required |
Require all five quantities positive and product P80<feed P80, with sizes in micrometres. Divide the constant by closingScreen^.23×gramsPerRevolution^.625×(10/sqrt(productP80)−10/sqrt(feedP80)). It does not use the ball-mill exponent or infer the test protocol.
Wi=constant/[screen^.23 gramsPerRev^.625(10/√P80−10/√F80)] Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| protocolRodMillWorkIndex | Protocol rod mill work index | number |
{
"input": {
"callerRodClosingScreenMicrons": 100,
"observedRodGramsPerRevolution": 2,
"observedRodFeedP80Microns": 1000,
"observedRodProductP80Microns": 100,
"callerProtocolConstant": 62
},
"output": {
"protocolRodMillWorkIndex": 20.38620940072256
}
}Limitations and assumptions
Units, ledger boundaries, survey interpretation and model applicability must be independently established. These summaries do not assign reserve/resource classifications or establish support adequacy, ventilation safety or an operating setting.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite.
Alternative or Complementary methods
For a related step, use Bond Operating Work Index Calculator: An operating Bond index can be inferred from net observed energy and matched size reduction. For a complementary comparison, use Grinding Work Index Calculator: Grinding work-index calibrations depend on the measurement protocol and material.
References
-
Bond Rod Mill Work Index Calculator — tool.io
Similar or alternative tools
- Bond Operating Work Index Calculator
An operating Bond index can be inferred from net observed energy and matched size reduction.
- Grinding Work Index Calculator
Grinding work-index calibrations depend on the measurement protocol and material.