In addition to gold gold sand sand, also contains many kinds of heavy mineral. Heavy mineral placer associated with the common-ness may be arranged according to the following: magnetic iron ore, iron titanium, rutile, garnet, zircon, pyrite, monazite ....... The gold particles are mostly granular or scaly, and their particle size is usually 0.5 to 2 mm, but it also has a weight of several kilograms, and there are powdery gold particles that are discernible to the naked eye. The gold color is usually 850-900, and the specific gravity is 17.5-18.0. Gold is divided into: according to the particle size: 1. large gold nuggets - greater than 5 mm; 2. coarse gold nuggets - 1.65 ~ 5 mm; 3. medium gold - 0.83 ~ 1.65 mm; 4. fine gold - 0.42 ~ 0.83 mm; 5. Particulate gold - 0.15 ~ 0.42 mm; floating gold - less than 0.15 mm.
Gold is mainly selected by gravity method. This is because the re-election method is simpler and more economical than other methods, and because the sand gold ratio is large and the particles are coarse, it is easy to sort by re-election. Mercury amalgamation , flotation, and other methods are mostly used to separate re-concentrated concentrates. Re-election equipment uses a variety of chutes, jigging and shakers, spiral and centrifugal concentrators .
The characteristics of sand gold are as follows: 1. The gold content is low, generally greater than 0.2-0.3 g/ m3 , and the heavy mineral (mine with a specific gravity greater than 4) is about 1-3 kg/ m3 ; 2. The maximum particle size and minimum amount of gangue The ratio of particle size is several thousand; 3. The yield of concentrate is very small (usually not more than 0.1-0.01%); 4. The ratio of ore dressing is particularly high (nearly thousands to 10,000 times); 5. The coarse concentrate has to be refined several times. In order to obtain gold and qualified heavy sand concentrate.
The typical process for sand gold sorting is shown below.
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