Cyanide Solution Control Parameters
In both cyanidation and flotation practice it is necessary to keep a close check on the working solutions, since the concentration of various soluble salts derived from, the ore or supplied as a protective measure to the system is usually critical. Alkalinity Because of the need in most instances for maintaining a definite protective lime […]
Sampling Pregnant Solution
The press-tails solution going to storage discharges into a spill box (A in drawing), thence passing through a bottom pipe into the barren-solution storage tank. The solution will stand in the spill box at a level depending on the volume of flow, i.e., the volume precipitated. On the side of box A is a smaller […]
Melting Gold Precipitate
Three types of melting furnaces are in general use, all oil-fired for the Melting of Gold Precipitate. For smaller plants treating gold ores, the tilting furnace with removable graphite crucible is usually preferred. Clay liners are quite generally used to prolong the life of the pot. In larger plants, particularly those treating silver ores, tilting […]
Gold Precipitation Methods
Clarification of Gold Solution The first essential to in any methods for effective Gold Precipitation is clear solution. Regardless of color, the solution must be bright and sparkling and entirely free from colloidal solids. One of the most important advantages of proper clarification is the avoidance of undue pressure build-up in the precipitate filters. With […]
Amalgamation Process of Gold
The use of direct amalgamation following stamps or primary mills and the use of barrel amalgamation for treating jig and corduroy concentrates. Precipitation of gold and silver on zinc dust or on zinc shavings is fully treated, from the clarification and de-aeration of cyanide solutions to the cleanup and melting of the bullion. The use of […]
Gold Ore Roasting Techniques
In the case of many complex gold and silver ores roasting before cyanidation is essential if satisfactory extraction of the precious metals is to be obtained. In such cases no practical amount of grinding or prolonged contacting of the raw ore with cyanide solution will affect more than a certain low extraction; in other cases, […]
Gold Metallurgy & Leaching in Cyanicides
Cyanidation as applied to ordinary gold and silver ores is a relatively simple process. When cyanicides {cyanide-consuming elements) are encountered in small amounts in the treatment of such ores, the various schemes already discussed, such as use of a lead salt or wasting barren solution, can usually be resorted to and successful operation maintained. When, […]
Gold Shaker Tables
Overflow from the grinding mill runs over Gold Shaker Tables which are flat and smooth and made of a fibrous wood known as “yolombo.” They are arranged in series much the same as blanket or amalgamation plate tables. The grain of the wood in the deck runs with the flow of pulp, and a sharp-pointed tool is […]
Gold Flotation
Though the gold recovery methods previously discussed usually catch the coarser particles of sulphides in the ore and thus indirectly recover some of the gold associated with these and other heavy minerals, they are not primarily designed for sulphide recovery. Where a high sulphide recovery is demanded, flotation methods are now in general use, but […]
Gold Recovery Methods
Regardless of subsequent treatment, it is considered best to recover free gold as early and as completely as possible in the flow of pulp. Gravity concentration in various forms is made use of for this purpose and amalgamation used for recovering the gold from the gravity concentrate. Concentration is also extensively practised where a large […]