Laserfiche WebLink
<br /> <br />ANALYTICAL -GENERAL <br />Introduction - <br />This section of the manual is intended for the metallurgists and chemists and is not <br />considered essential for the operators know. <br />The operators perform routine picric cyanide tests on the treated effluent for control <br />purposes. The reagents and coloured standards they use are prepared by the laboratory. The <br />communication between the assay laboratory and operations is extremely impdrtant especially <br />when iron cyanide is present since the operators need to know copper and irod concentrations <br />and are generally not equipped to determine these metals themselves. <br />Often confusion arises in trying to match assays obtained in-house with those from an <br />outside laboratory. Asub-section on sample preservation has been included so that the <br />discrepancy is minimized. Composite samples are considered to be samples tvlttich have aged <br />without being stabilized and will generally be lower in metals and cyanide than found if the <br />sample was analyzed immediauly. <br />Also included is a summary of the cyanide terminology commonly used, <br />Cyanide Terminoloev <br />There are various forms of cyanide that are referred to in the mining industry. Usually <br />the assay method refers to cyanide in the solution phase only. <br />Total cyanide (CNT) normally refers to both free and complexed forms of cyanide in <br />solution, and it is determined by a distillation procedure. Occasionally, dry solids are used in <br />the distillation apparatus in order to find the total cyanide that has precipitated with the solids. <br /> <br />1 <br />