Question

estimation of sulphur content in coal sample is important

Answer 1



Definitions

Lot:
A quantity of material for which the overall quality to a particular precision needs to be determined.

Sub-lot:
Equally sized parts of a lot, which properties are to be determined.

Nominal top size:
The smallest sieve on which not more than 5% of the sample is retained.

Primary Increment:
The amount of material which the primary sampling tool takes out of the material stream in one cut.

Cut:
An increment taken by a sampler.

Gross Sample:
A material sample consisting of all the primary Increments taken from a sub-lot.

Division:
A sample preparation process, in which the sample is divided in a number of smaller portions.

Sample:
The quantity of material consisting of all the increments taken from a lot/sub-lot.

Final sample:
A sample prepared from the sample of a sub-lot.

Precision:
Expressed in % and within 95% confidence level.

Bias:
A systematic error that creates results that on regular basis are higher or lower than the true value.

Main Conveyor Belt (1), Cross Belt Bucket Sampler (2), Dosing Conveyor (3), Twin Roll Crusher (4), Rotary Tube Divider (5), Bias Valve (6), Buffer Container (7), Dosing Conveyor (8), Rotary Tube Divider (9), Sample Containers (10) & Reject Conveyor (11).