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Flotation is widely used in gold processing. In China, 80% rock gold is processed by flotation. Flotation process maximizes the enrichment of gold into sulfide minerals. The tailings can be directly discharged. Flotation in gold mine has low beneficiation cost.
questions about gold flotation processing technology - xinhai
In addition of the cyanidation leaching method, flotation and gravity separation are also used in gold ore processing. The gold flotation separation method is also a common gold ore beneficiation method, which is mainly used in extracting associated gold in polymetallic ore, removing impurities of gold extracted by cyanidation and so on.
Flotation separation method is a relatively complicated method of mineral processing. When using gold flotation method to separate gold ores, the range of parameters determined by the beneficiation test and the production needs of the beneficiation plant are adjusted to determine specific mineral processing schemes for different gold ores to achieve ideal recovery and gold concentrate grade.
Gold flotation method is the main processing method for gold-bearing sulfide ores. The main characteristics of this kind of ores are often gold, silver, lead, sulfur and other minerals. Metal minerals include pyrite, sphalerite, galena, chalcopyrite, etc. Gangue minerals are mainly quartz, and include calcite, barite and other minerals. Gold minerals have similar flotation properties with sulfide minerals, especially with copper sulfide minerals. Therefore, the flotation process of gold ore is similar to that of copper sulfide minerals.
Collectors used in gold flotation include xanthate, black powder, ammonium black powder, etc. Usually there are two ways to use one or several collectors separately. Commonly used foaming agents include terpineol, alcoholic oil, 730 series foaming agents, etc. Inhibitors include lime, sodium sulfide, dichromate, etc. Therefore, how to select the composition of the agent should check the specific properties of the ore.
Due to the complexity of the disseminated relationship of this type mineral, We need to control the appropriate grinding fineness. It is necessary to do mineral dressing test before confirming the grinding fineness and reagent system.
Arsenic not only has a great impact on the quality of gold concentrate ore, but also pollutes the environment. Arsenic in gold ore is generally found in arsenopyrite, the gangue mineral, and it is more closely disseminated with gold minerals and is more difficult to separate.
The common methods for reducing the content of arsenic in the concentrate is the soda method, the lime method, the oxidation method. Among them, the oxidation method is a relatively more effective and widely used method. The main principle of this method is oxidizing the surface of the arsenic mineral and inhibiting the arsenic mineral by adding the oxidizing agent to increase the content of free oxygen in the aqueous solution.
On the basis of inhibition of arsenic, the content of free oxygen in water can be increased and the floatability of arsenic minerals can be lowered by adjusting pH and temperature, so that the content of arsenic in gold concentrate is reduced. Generally, arsenic minerals have good floatability under weakly acidic conditions, while under neutral and weakly alkaline conditions, the floatability of arsenic minerals is reduced, and gold minerals still have good floatability under such conditions. Normally, we adjust the PH value to 8 to separate the arsenic-containing gold ore by gold flotation.
For different arsenic-bearing gold mines, the specific oxidants, PH values, and temperature ranges are different. Hence, it is more scientific and rational to determine appropriate conditions by doing mineral processing test.
The organic carbon minerals in the gold ore not only have good floatability, but also have strong adsorption power, which not only affects the gold concentrate grade, but also wastes a lot of flotation reagents. Therefore, it is necessary to reduce the influence of organic carbon on gold flotation through decarburization.
Decarburization can be achieved by roasting, adding agents and other methods. Roasting is mainly aimed at gold ores with high carbon content. For gold ore with relatively low carbon content, carbon can be firstly selected by sodium silicate, no. 2 oil and kerosene, and the floatability of carbon inhibited by CMC can also be added into pulp. However, the method of adding inhibitors has a great impact on the recovery of gold ore, so the organic carbon in gold ore can be removed by selecting carbon first.
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Mining Equipment Manufacturers, Our Main Products: Gold Trommel, Gold Wash Plant, Dense Media Separation System, CIP, CIL, Ball Mill, Trommel Scrubber, Shaker Table, Jig Concentrator, Spiral Separator, Slurry Pump, Trommel Screen.
gold flotation concentrate
The flotation method is a widely used technique for the recovery of gold from gold-containing copper ores, base metal ores, copper-nickel ores, platinum group ores and many other ores where other processes are not applicable. Flotation is also used for the removal of interfering impurities before hydrometallurgical treatment, for upgrading of low sulfide and refractory ores for further treatment. Flotation is considered to be the most cost-effective method for concentrating gold.
In this process of rock minerals that have been taken from the mine site and then destroyed by the machine to obtain a fine grain of sand to free metal-containing granules for further processing. In the destruction of mineral rocks of machine tools can use a stone crusher machine, so the minimum size of rock minerals can reach between 28 mesh.
At this stage after a mineral ore that is refined inserted into the machine agitator tank which is usually also called a flotation cell to produce a pulp slurry concentrate.Distilled water provision inserted into the flotation cell flotation machine is then run, examined the amount of initial pH and initial temperature. In the flotation tank, stirring with impellers, which are intended to produce turbulent motion of fluids (pulp), so that when inserted air flow will form air bubbles.In the pulp is then coupled collector-1,-2 collector and frother; flotation machine run back to the time varying adjustment, and examined the amount of the final pH and final temperature.
In the processflotation reagent which in use is a form of lime, bubble and collectors. Froth forming a bubble that is stable and that float to the surface as a froth flotation cell. Collector reagents react with the surface of the precious metal sulfide mineral particles making the surface is water repellent. surface of the mineral-bound water molecule is released and will be changed to hydrophobic.
Thus the collector end of the hydrophobic molecules will be bound hydrophobic molecules from the bubble, so the mineral ore can be adrift. Collector has a molecular structure similar to the detergent hydrophobic sulfide mineral grains are attached to the air bubbles that rise from the slurry zone into the froth that floats on the surface of cells.
In the flotation process of air bubbles formed initially has small size and some are attached to the surface of mineral particles. Furthermore, another air bubble formed next to join the existing air bubbles and form air bubbles with a larger size, so as to have sufficient lift to lift mineral particles to the surface. The mechanism of attachment of mineral particles in the air bubbles inside the tank during the flotation process flotation occurs when the hydrodynamic forces and the forces of interaction between mineral particles with air bubbles, resulting in collisions with air bubbles and mineral particles occurs attachment of mineral particles with air bubbles.
From the results ofbubblefrothflotation processthat resembles acolored foam detergent concentrate metallic orescarryinggold-coppermineral-ladenis thenuptothe tubshelter, and foam concentrate that has been lifted from the drain into the upper lip and into the trough flotation machine is in use as a valuable mineral collection.
In order fortheflotationprocesscan take placebyeithermeansof attachmentof particlestoairbubbleslasteduntilthetop edge of theflotationcell,it is necessary toconsiderthe followingmatters :
gold processing,extraction,smelting plant design, equipment for sale | prominer (shanghai) mining technology co.,ltd
Prominer maintains a team of senior gold processing engineers with expertise and global experience. These gold professionals are specifically in gold processing through various beneficiation technologies, for gold ore of different characteristics, such as flotation, cyanide leaching, gravity separation, etc., to achieve the processing plant of optimal and cost-efficient process designs.
Based on abundant experiences on gold mining project, Prominer helps clients to get higher yield & recovery rate with lower running cost and pays more attention on environmental protection. Prominer supplies customized solution for different types of gold ore. General processing technologies for gold ore are summarized as below:
For alluvial gold, also called sand gold, gravel gold, placer gold or river gold, gravity separation is suitable. This type of gold contains mainly free gold blended with the sand. Under this circumstance, the technology is to wash away the mud and sieve out the big size stone first with the trommel screen, and then using centrifugal concentrator, shaking table as well as gold carpet to separate the free gold from the stone sands.
CIL is mainly for processing the oxide type gold ore if the recovery rate is not high or much gold is still left by using otation and/ or gravity circuits. Slurry, containing uncovered gold from primary circuits, is pumped directly to the thickener to adjust the slurry density. Then it is pumped to leaching plant and dissolved in aerated sodium cyanide solution. The solubilized gold is simultaneously adsorbed directly into coarse granules of activated carbon, and it is called Carbon-In-Leaching process (CIL).
Heap leaching is always the first choice to process low grade ore easy to leaching. Based on the leaching test, the gold ore will be crushed to the determined particle size and then sent to the dump area. If the content of clay and solid is high, to improve the leaching efficiency, the agglomeration shall be considered. By using the cement, lime and cyanide solution, the small particles would be stuck to big lumps. It makes the cyanide solution much easier penetrating and heap more stable. After sufficient leaching, the pregnant solution will be pumped to the carbon adsorption column for catching the free gold. The barren liquid will be pumped to the cyanide solution pond for recycle usage.
The loaded carbon is treated at high temperature to elute the adsorbed gold into the solution once again. The gold-rich eluate is fed into an electrowinning circuit where gold and other metals are plated onto cathodes of steel wool. The loaded steel wool is pretreated by calcination before mixing with uxes and melting. Finally, the melt is poured into a cascade of molds where gold is separated from the slag to gold bullion.
Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.