Cyanide Leaching and Decomposition of Pyrrhotite
Research on cyanidation methods brought considerable discussion on the reactions involved in the leaching and decomposition of pyrrhotite in cyanide solutions. Pyrrhotite has one loosely held sulphur atom which readily reacts with cyanide to form thiocyanate: Fe5S6 + NaCN = NaCNS + 5 FeS The ferrous sulphide oxidizes rapidly to the sulphate which reacts with cyanide to […]
Eliminating Copper from Gold Ore
When reviewing Methods of Eliminating Copper from Gold Ores we see that several methods have been suggested to eliminate copper from ores prior to cyanidation. Preliminary extraction of the copper with sulphuric or sulphurous acids may be applicable to ores containing oxidized copper minerals such as malachite, azurite and chrysocolla but these acids have but little […]
Pulp Density Solids to SG Convertor Calculator
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Double Beam Type Balance and Moisture Scales
BALANCE, Trip, Double-beam Type—Capacity, 5000 grams by 1/10 gram. The double beam makes it possible to weigh up to 110 grams without the use of weights. Above 110 grams, only weights of 100 grams and up are required, thus insuring speed and accuracy. The double beam is of great advantage when weighing material in containers, as no counterweights […]
Titration of Cyanide Solutions Containing Dissolved Copper
When silver nitrate is added to sodium cuprocyanide of the composition Na2Cu(CN)3, an appreciable amount must be added before a precipitate comes down. The reactions are believed to be as follows: 2 Na2Cu(CN)3 + AgNO2 = 2 NaCu(CN)2 + NaAg(CN)2 + NaNO3 On further addition of silver nitrate, a precipitate of CuCN begins to come […]
Calculate Top Ball Size of Grinding Media -FRED C. BOND Equation & Method
Although it was developed nearly 50 years ago, Bond‘s method is still useful for calculating necessary mill sizes and power consumption for ball and rod mills. This paper discusses the basic development of the Bond method, the determination of the efficiency correction factors based on mill dimensions and feed characteristics, and the application of the […]
Laboratory Reagent Bottles and Brushes
BOTTLE CAP—Glass. For narrow mouth Reagent bottles. The edges of these caps are beveled and semi-polished, making a highly finished article to protect the mouths and stoppers of bottles from dust. BOTTLE, Specific Gravity—Accurately adjusted, with ground-in centigrade thermometer divided Into 1/5 degrees, and with capillary overflow tube. Capacity 50 ml. BOTTLE, Washing, Pyrex Glass—With wicker covered neck […]
GOLD AND SILVER ORES-THE PLATTNEF ANT SISS PROCESSES
Chemical Reaction of Copper Minerals and Cyanide
In discussing the Reaction Products from Copper Minerals and Cyanide you will find that when an excess of copper mineral is acted upon by cyanide solution, dissolution of copper continues at a decreasing rate until equilibrium is established and no more copper goes into solution. The rate will vary with the particular mineral used as […]