18 Questions
What are the two main classes of fluids that can be sampled according to the text?
The two main classes of fluids that can be sampled are (a) Liquids - such as water, oil, molten metal, slags, etc. and (b) Gases - such as flue gas, producer gas, etc.
What is the general principle for sampling fluids according to the text?
For fluids, it is necessary to mix them thoroughly before withdrawing any convenient portion as a sample.
How does the quantity of sample taken depend on the material being sampled according to the text?
For fragmental materials, the quantity to be taken depends upon the value and uniformity of the material and the size of the largest particles.
What is the recommended procedure for obtaining a true sample of ore that breaks into lumps of large variation in size?
For ore which breaks into lumps of large variation in sizes, crushing the materials into a fine powder and thorough mixing is desirable to obtain a true sample.
What are the two main methods for sampling ore in place according to the text?
Ore sampling in place can be done by hand or through mechanical samplers.
What is the purpose of the crushing process in preparing ore samples for chemical analysis?
Crushing is a size reduction process and is done to assist the efficiency of mixing the ore samples.
What is the purpose of coning and quartering in sample preparation for ores?
To reduce the volume of crushed ores.
How is the cone flattened during the coning and quartering process?
By drawing the ore from the center outward with a shovel.
What type of equipment is a riffle and what is its purpose?
A riffle is used to divide crushed samples into halves.
What is the purpose of grinding/pulverizing in sample preparation for ores?
To save time in dissolving ore for analysis.
What are the two basic types of sampling errors discussed in the text?
Contamination and procedural errors.
What is the primary objective of sampling in metallurgy?
To obtain a representative of a whole mass.
Why is contamination a larger issue for precious metals in sampling?
Due to the potential for any contamination to significantly impact the analysis of precious metals.
Why are samples obtained directly from mine face or stockpiles not suitable for chemical analysis?
Samples obtained directly are not suitable for chemical analysis because they are not true representatives.
What is the purpose of sample preparation in the assay laboratory?
To ensure the new sample has the same composition as the whole mass.
Why is it important for the chemical analysis samples to be true representatives?
Chemical analysis of non-representative samples cannot provide correct information.
What are the two distinct operations that must be given equal importance in metallurgical value determinations?
Sampling and chemical analysis.
What is the term used to describe the process of obtaining small representative material for analysis in metallurgy?
Sampling.
Learn about the utilization of mechanical laboratory equipment such as crushers, coning and quartering for ore processing. Explore the process of reducing ore volume through various techniques.
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