Froth flotation works by exploiting the hydrophobic properties of gold molecules. First, ore is ground into an extremely fine powder. The powdered ore is mixed with water to create a slurry, which is mixed with surfactants to increase the golds hydrophobicity. This mixture is placed into a large tank filled with distilled water.
Lime is the most economical and commonly used reagent for pH control in flotation. . Ca 2+ ions in lime can enhance depression of minerals and flotation selectivity in a variety of ores. . For talc and clay rich ores, Ca 2+ ions can be detrimental, and other pH modifiers are preferred. .
When a certain amount of lime is present in the slurry, Ca2+ reacts with CO2 in the air entering the slurry to form a CaCO3 precipitate, which inhibits the flotation of natural gold particles. The addition of lime in the flotation operation is usually carried out by adding the lime powder to the ore belt of the ball mill or adding lime milk or ...
Both quicklime and hydrated lime are widely used in the flotation or recovery of non ferrous metals, including copper, zinc, nickel and lead bearing ores. Lime is used extensively in the recovery of gold and silver. Ores, either run of mine, milled, autoclaved or roasted, are combined with lime and a cyanide solution.
The present paper describes the beneficiation of low grade gold ore by flotation columns and the implications of improved metallurgy on subsequent cyanidation. 2. EXPERIMENTAL 2.1. The gold ore The mineralogical assay of gold ore revealed that the ore is semi refractory containing both free and refractory gold approximately in the ratio of 80:20.
REAGENTS USED IN FLOTATION OF GOLD ORES. Conditioning agents are commonly used, especially when the ores are partly oxidized. Soda ash is the most widely used regulator of alkalinity. Lime should not be used because it is a depressor of free gold and inhibits pyrite flotation. Sodium sulphide is often helpful in the flotation of partly oxidized ...