After the primary gold deposit is exposed to the surface, due to the mechanical and chemical weathering, the gold-bearing or gold-bearing parent rock is gradually broken into rock fragments and gold particles.
Then, under the action of external force transfer and sorting, minerals with a large specific gravity (such as gold particles) are deposited on the slopes of riversides, riverbeds and lakeshores to form a certain enrichment, which has the value of industrial exploitation. It is called a gold deposit.
Gold deposits are usually mined by gold mining, hydraulic mining, excavation mining and underground (shaft) mining.
China's gold-gold deposits are mainly based on gold mining, and there are also hydraulic mining and excavator mining.
The gold ore beneficiation process mainly includes preparation work and sorting operations before the sorting.
The preparation work consists mainly of two processes: shredding and sieving.
The shattering is mainly to dissociate the ore and clayey slime from the mined ore.
Screening is the screening of coarse fractions that do not contain gold.
Commonly used equipments include flat screens, cylindrical screens, cylinder scrubbers, and the like.
The selection of gold is mainly based on gravity beneficiation. This is because the ratio of sand to gold is large (average 17.50 to 18.0), the grain size is relatively coarse (generally 0.074 to 2 mm), and the other is because the gravity dressing method is economical and simple. .
Re-election equipment generally uses various types of chutes, jigs, and shakers (usually used for selection).
20K Blind flange is installed at the end of a piping system either on a header or branch connection or on a valve and functions as a means for positive isolation of the piping system. Piping headers can be terminated at the ends using a butt weld cap. However the cap is often substituted by a blind flange if a provision for future extension of the header is required. On drain systems blind flanges serve as important rodding points or can be dismantled for easy inspection. Blind flanges can be drilled and used as reducing slip on flanges or the blind flange can be drilled and tapped for use as a threaded reducing flanges. Blind flanges are avaliable in the same pressure ratings as weld neck flanges and with various gasket facings. From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types. However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these flanges are suitable for higher pressure temperature applications.
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