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Problem with gold recovery from sulphide oreHow may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an oxidized ore. A neighboring mine may have a higher tailing loss but still make more money due to lower milling costs.
Free quote Send messageFor many years, after introduction of the cyanide process for dissolution of gold, the usual practice was to grind all the ore with little or no concentration before cyanidation. There were two general cyanidation flowsheets sand leaching and all sliming. The latter ultimately has almost completely replaced sand leaching.
With the advent of flotation and the fact that gold either free or finely disseminated in pyrite, etc., could be floated, many possibilities opened up for the treatment and concentration of gold ores. It also provided the means of working ore bodies hitherto considered unprofitable or metallurgically impossible for cyanide treatment. Two examples are the large low-grade ore bodies which require very fine grinding and refractory sulphides which have to be concentrated and roasted to expose gold to cyanide action.
There are many arrangements and combinations using flotation in conjunction with treatment of gold ores. The two gold process flowsheets shown, with some variations, are probably the most commonly used.
In GoldFlowsheet No. 1 the ore is ground in water to such a size as to free the minerals sufficiently to produce a tailing by flotation low enough in value that it may be discarded.
Here a Mineral Jig is used in the Ball Mill Classifier circuit. This recovers coarse and fine free gold preventing any build-up in the circuits especially in the grinding circuit. It also efficiently removes any oxidized or tarnished non-floatable gold. The jig thus operates as a safety valve. If the quantity and grade justify, the jig hutch product may be amalgamated in a Amalgamation Unit or sent to subsequent cyanide treatment with the flotation concentrates.
Flotation concentrates are dewatered and finely ground for maximum exposure of gold and sent to the cyanide plant. The grinding is preferably done in cyanide solution.
Standard practice is followed as shown the slight difference usually being more intense agitation as supplied by Super-Agitators with maximum aeration. The following advantages may be claimed plus others not enumerated.
The second flowsheet is another application of flotation as applied to a gold ore. In this case the flotation tailings are cyanided for gold recovery. The Jig is again employed in the grinding circuit as in Gold Flowsheet No. 1 for the same reasons.
Froth flotation is the use of the physical and chemical properties of the surface of the ore, the use of chemical separation of useful ore. In the process of froth flotation, useful minerals are separated by floating them in the foams, and the way of keeping gangue minerals in the pulp is called positive flotation, while the way of floating gangue minerals in the foam is called reverse flotation.
Froth flotation is the most widely used phosphate ore separation process. Because of the nature of the phosphate ore, such as mineral types and content, disseminated particle size, its separation difficulty and flotation types varies. Phosphate ore is divided into siliceous phosphorite, calcareous phosphorite, and siliceous phosphorite according to the chemical composition of the minerals.The froth flotation types differ from different types of phosphate ore greatly. The following is a brief introduction to 5 common types of phosphate ore forth flotation process.
Gold flotation process is a kind of beneficiation method that makes the useful gold mineral adhere to the bubble to achieve gold enrichment by means of the different physical and chemical properties of the ore surface.
Froth flotation process can be divided into one stage froth flotation and two stages froth flotation also known as stage froth flotation. So how do you choose the froth flotation process according to the stage Generally, the selection of froth flotation stages mainly depends on the embedding features of useful minerals.
Flotation of non-sulfide minerals is more difficult than that of sulfide minerals. The main reason is that non-sulphide ores usually have high water solubility, and the useful minerals and gangue minerals are usually of similar types, with a small difference in surface properties.
Flotation test is used to determine the charging capacity, pulp concentration, pH value, types and dosage of flotation reagent, reaction time of the flotation process. It is very necessary before the formal production.
Flotation froth plays an important role in the froth flotation process. So whats the function of flotation froth in the froth flotation process.
Flotation froths are important for the floation effect. Lets see how to judge the flotation effect by flotation froths.
This is a guide to froth flotation problems and solutions. Click to learn more details.
The common gold extraction processes include gravity separation process, froth flotation process, cyanidation, etc. Froth flotation process is the most widely used in gold extraction, but for different types of gold, we can choose flotation process combined process in order to improve the return on investment.
105 Acres with multiple Lode Mines 45 Patented Acres including Mill Site Hard rock Mill is nearly completed and all equipment is included in the selling price 65 Gold veins and one Ore Body have been discovered so far on multiple mining sites 4 million has been spent on all mine development and the hard rock mill Potential for 1 Billion or more in Gold.
Recovery in the flotation cell while also reducing power consumption and the risk of sanding. Get the best flotation performance for your fine ores with the Outotec of ore per year, with cell capacities of 1.5, 3.6, or 11 m3.
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Flotation machine is mainly used for selection of fine material from the cloth of gold inlay, silver, copper, iron, lead, zinc, molybdenum, nickel, aluminum and other Ores. High Efficiency Non-Ferrous Metal SeparatorFlotator XJ-3 1 Inspiratory capacity, low power consumption.
There were instances, where at one time the whole of the ore was roasted before cyanidation, but this practice has been for the most part discontinued on account of the large plant and high overall costs involved. With improvements in flotation methods, the generally accepted procedure today is to concentrate the gold or silver bearing minerals into a small bulk and roast the concentrate only. The calcine is then usually treated in a small cyanide circuit, with the residues sometimes passing into the main cyanide circuit, if the flow sheet includes such a step, or sent directly to waste.
Those types of gold ores which most frequently require roasting include ores carrying arsenopyrite, stibnite, sulphotellurides, and pyrrhotite. Straight pyritic ores, where the pyrite is present in small quantities, usually yield their gold to fine grinding and cyanidation alone.