Free plant trial tool · Browser-local calculation

Grinding Rod Consumption Trial Ledger

Reconcile rod mass, dry feed, and recovered removals before comparing a baseline with a trial.

1 Record matched blocks2 Check operating comparability3 Export the review record

Mass-balance boundary: recovered removal categories explain the gross result; they are not added to it again.

Trial traceability

Identify the plant record before comparing the number.

These fields are included in copied and CSV records. The Excel template carries a fuller protocol and sign-off sheet.

Site / mill IDBaseline periodTrial periodBaseline supplier / lot / heatTrial supplier / lot / heatMeasurement / calibration basisPredeclared acceptance rule

Baseline block

Rods entering (kg)Serviceable transfer out (kg)Opening working charge (kg)Closing working charge (kg)Dry new feed (t)

Classified recovered removalsIncluded within gross consumption

Broken rods (kg)Bent rods (kg)Planned removals (kg)Other recovered removals (kg)

Trial block

Rods entering (kg)Serviceable transfer out (kg)Opening working charge (kg)Closing working charge (kg)Dry new feed (t)

Classified recovered removalsIncluded within gross consumption

Broken rods (kg)Bent rods (kg)Planned removals (kg)Other recovered removals (kg)

Baseline gross—kg/t dry feed

Trial gross—kg/t dry feed

Difference—trial versus baseline

StatusEnter both operating blocksbuyer decision still required

Baseline residual after recovered removals: —Trial residual after recovered removals: —

Comparability gate

Put the operating conditions beside the number.

Exact matching text is only a record check. Buyer engineering decides whether two blocks are physically comparable.

Factor	Baseline	Trial	Record check
Ore / feed family	Baseline Ore / feed family	Trial Ore / feed family	Missing
Feed-size basis / F80	Baseline Feed-size basis / F80	Trial Feed-size basis / F80	Missing
Product-size result / P80	Baseline Product-size result / P80	Trial Product-size result / P80	Missing
Throughput / feed-rate range	Baseline Throughput / feed-rate range	Trial Throughput / feed-rate range	Missing
Power or specific energy	Baseline Power or specific energy	Trial Power or specific energy	Missing
Mill speed	Baseline Mill speed	Trial Mill speed	Missing
Water / slurry-solids context	Baseline Water / slurry-solids context	Trial Water / slurry-solids context	Missing
Rod-charge practice	Baseline Rod-charge practice	Trial Rod-charge practice	Missing
Liner / discharge state	Baseline Liner / discharge state	Trial Liner / discharge state	Missing
Downtime / deviations	Baseline Downtime / deviations	Trial Downtime / deviations	Missing
Transition / stabilization	Baseline Transition / stabilization	Trial Transition / stabilization	Missing

Download repeated-block Excel templateRead the measurement method →

The CSV carries the values currently entered above. The Excel file is a separate repeated-block template and does not automatically receive browser fields.

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Calculation method

How the mass balance is calculated.

Gross consumption = M-in − M-out − (ending charge − opening charge)Gross kg/t = gross consumption ÷ dry new feed

The residual equals gross consumption minus separately weighed broken, bent, planned, and other recovered removals. It may include progressive wear, carryout, unweighed fragments, mixing, or measurement error; the calculator does not rename it as wear.

Workbook

Carry the same logic into repeated blocks.

The downloadable Excel ledger includes a formula-linked baseline/trial summary, an editable trial protocol, a filtered operating-block table, field definitions, formulas, and source notes. Only rows explicitly marked “Yes” are included in the weighted summary.

Interpretation

Questions to settle before a supplier comparison.

What does the grinding rod kg/t result measure?

It reports gross rod consumption across the declared mill boundary divided by metric tonnes of dry new feed in the same operating block. It is a mass-balance result, not a direct measurement of progressive wear alone.

Why are broken, bent, and planned removals shown separately?

Those recovered categories help explain the gross replacement burden. They are included within the mass balance and must not be added to gross consumption a second time.

Does a lower trial kg/t prove that one supplier is better?

No. Ore and feed, throughput, product target, charge practice, liner state, downtime, measurement uncertainty, and repeated operating windows still need buyer engineering review.