Gold plant metallurgist continually strives for optimum results in operation. This needs a constant flow of reliable data from all sections of the plant. Sampling is a key component of this process. Samples are taken during the gold plant design and throughout the process circuit on a regular schedule for analysis, the results of which then form the basis for all calculations pertaining to the gold flotation plant. In this way, bench scale flotation testing programs are carried out on mill feed samples to ensure the good performance of the plant. Sometimes, non-standard flotation tests are carried out to investigate the effect of changes in reagents, types dosages, primary or regrind grind size, gold ore type, or water conditions on a small scale to quickly determine optimum mill operating conditions or to trouble shoot for operations when unexplainable fluctuations occur in gold flotation performance. The results from these tests are one of the main aspects with which the plant metallurgist bases his decision making upon.
All laboratory procedures must be followed in a careful, consistent manner to obtain accurate and reproducible results. Proper flotation techniques are especially important as this testwork allows the most variations in operating style of any procedure. Laboratory technicians have to develop their skills so that they will be employing similar techniques and procedures in all tests. Reagent preparation and additions, froth skimming frequency, and overall control of the test must be comfortable standardized techniques for all laboratory technicians. It is important to mention that test series must be completed by a single operator as that the only variable is the one being tested. It is important to be cautions of possible agitation and aeration changes between flotation machines, for this reason is important to employ the same flotation machine throughout a given testing program.
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