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.
A heat exchanger is a device used to transfer heat, usually to transfer heat from one fluid to another without them mixing. A heat exchanger usually consists of a number of parallel pipes in which one fluid flows through the pipe and another fluid flows through the outside of the pipe. In this way, heat can be transferred from one fluid to another for heating or cooling purposes. Heat exchangers are widely used in many industries, such as chemical, pharmaceutical, food processing, air conditioning and heating systems, etc.
Heat exchanger usually consists of the following components:
1. Heat exchange pipe: Pipe used to transfer heat, usually made of metal materials, such as copper, stainless steel, etc.
2. Heat exchange surface: A surface used to transfer heat, usually consisting of metal sheets or pipes. The greater the surface area, the higher the heat transfer efficiency.
3. Housing: Housing, usually made of metal or plastic, used to secure heat exchange pipes and surfaces.
4. Seals: Seals used to prevent media leakage, usually made of rubber or silicone rubber.
5. Support: A support used to support a heat exchanger, usually made of steel or cast iron.
6. Import and export pipes: pipes used for medium entry and exit, usually made of metal or plastic.
7. Cleaning hole: A hole used to clean the inside of the heat exchanger, usually located on the upper or side of the heat exchanger.
8. Insulation layer: Insulation layer used to keep the temperature of the heat exchanger stable, usually made of glass wool or polyurethane foam.
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