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Refractory ore chemistry Britannica

Refractory Ore Definition

Other articles where Refractory ore is discussed gold processing Extraction from refractory ores Many goldbearing ores and concentrates are not readily amenable to cyanidation owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold preferentially adsorb the gold as it dissolves a phenomenon called pregrobbing or completely surround the

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The simplest grinding circuit consists of a ball or rod mill in closed circuit with a classifier the flow sheet is shown in Fig 25 and the actual layout in Fig 9 This singlestage circuit is chiefly employed for coarse grinding when a product finer than 65 mesh is not required

Ball milling is one of the earliest approach for BNNTs synthesis 59 The process involves extensive ball milling of boron powder for a long period of time up to 150 h in NH 3 gas followed by annealing at high temperature up to 1300C in N 2 environment

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