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According to the degree of ore oxidation, gold ore can be divided into primary (sulfide ore) ore, partially oxidized (mixed) ore and oxidized ore. Here are the different kind of gold ore processing methods used for five types of gold ore.
Poor sulfide gold ore processing
Polysulfide gold ore processing
Gold-bearing polymetallic ore processing
Gold telluride containing gold ore processing
Gold and copper containing ore processing
Let's get strated.
This kind of gold ore is mostly quartz vein type gold ore, also includes multiplex-quartzite and fine vein disseminated type. The sulfide content is little, mostly pyrite. In some cases, this gold ore is associated with copper, lead, zinc, tungsten, molybdenum and so on. The natural gold size in such ores is relatively large. Gold is the only object to be recovered, other elements or minerals have no industrial value or can only be recovered as by-products. Using the single froth flotation process or all-slime cyanidation process (CIP process or CIL process) can obtain higher gold ore processing indexes.
There are rich pyrite and arsenopyrite in this kind of gold ore, which are also be recycled with the gold. The gold grade is low, the natural gold grain is relatively small, and is mostly wrapped in pyrite. It is generally easier to separate gold from sulfide by froth flotation process. But the separation between gold and sulfide needs the complex combined process, otherwise the gold ore processing indexes won’t be too high.
There are copper, copper-lead, lead-zinc-silver, tungsten-antimony and other metal minerals in this kind of gold ore except for the gold. All of them have the value of separate mining. For this kind of gold ore, it contains the considerable amount of sulfide (10~20%), the natural gold is closely symbiotic with pyrite, copper, lead and other minerals. The natural gold is inlaid with uneven thickness and the length of grain size varies. And there are many kinds of minerals can be utilized. Therefore, this kind of gold extraction generally adopts more complex gold ore processing methods for separation.
Gold is still abundant in the form of natural gold, but much of it occurs in gold tellurides. This ore is mostly low temperature hydrothermal deposits and gangue rocks are quartz, chalamite quartz and carbonate minerals.
The difference between this kind of gold ore and the third kind of gold ore is that gold has a low grade, but can be used as one of the main comprehensive utilization elements. The natural gold in ore is medium size and the symbiotic relationship between gold and other minerals is complex. For this kind of gold ore processing, most of the gold is concentrated in copper concentrate and the gold is recovered during copper smelting.
The above is the specific processing method for the five kind of gold ore. But in actual productiom, it is adviced to consider the nature and composition of the ore and find professional manufacturer to design the specific solution for your mine.
1Summary of Gold Cyanidation Methods 996 4123