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Election Process Steps of Placer Gold Beneficiation
Election Process Steps of Placer Gold Beneficiation
Gold ore processing equipment is one of the devices commonly used to extract gold, gold placer mineral processing equipment there are three: chute, shaker, jigger.Principles of placer gold beneficiation process is to maximize the recovery of gold and its a various associated heavy minerals from ore using gravity separation, and then flotation, amalgamation, magnetic and electrostatic jointly selected job gold and various heavy minerals separated from each other in order to achieve comprehensive recovery purposes.Placer gold's beneficiation is generally divided into crushing and screening, off mud and sorting and other processes.1.Crushing and screening
Many placer gold contain cemented mud pie, and some of its more than 100 mm diameter. This mud pie, if not crushing, will exclude together with waste rock in screening process , resulting in the loss of gold. In addition, the clay can also cemented on gravel or pebbles, if not crushing losses have gold in the screening process.
In gold mining ship, crushing and screening together when the job done within the cylindrical screen. Cylindrical screen built with intermittent helix angle. In operation, the washing water pressure inside the cylindrical screen should not be less than 35 kPa, in the land of fixed plant, then set the washing and screening crushing ore deposits. The flat type or flat Gui Gui 50 i-100 gun-type two, according to the diagonal direction repeatedly washed. Gun outlet pressure can't less than 20 kPa.
Screening operations can remove 20-40% of the waste rock (gravel, pebbles), is an indispensable mineral placer operations. Measurement data to determine the parameters must be based on a reasonable screening of gold ore raw intensity component. At present, China selected placer mining is generally 10-20 mm sieve, such as fixed chute do roughing device mesh can be larger, but not more than 60 mm. Fixed election plant screening equipment, mostly grid screen, vibrating screen, then use the gold mining ship cylindrical screen. Not only on the screen flush improve screening efficiency, the solution can be further broken clay, sand gold mine so much water sieve screening operations. Water flushing water sieve determined in accordance with the requirements of washing, and should try to meet the job of sorting the lower concentration requirements, such as the Department of the chute roughing the flushing water should be 8-14 times the amount of sand ore.
2. Desliming
Gold placer material is generally less than 0.1 mm excluding gold or gold is minimal. Difficult to recover in the sorting process, while the same level of slime Quedui grain sorting process, especially the mechanical sorting process from interference. So, in the gold placer machinery concentrator, always managed to be less than 0.1 mm of slime off. Desliming production equipment used for a variety of off the mud bucket, and the chute with gold material allows a wide grain size and large capacity, and therefore does not take off before sorting chute mud.
3. Sorting
Practice has proved that the re-election law dealing with gold placer most effective and economical method. Due to the composition of different size gold placer minerals, a variety of effective size limits re-election materials handling equipment is different, so a reasonable gold placer sorting process should be a joint operation of several re-election equipment.
Crude excerpts drawn gold concentrate, gold grade of 100 g / t, heavy minerals and more at 1-2 kg / t for coarse gold ore processing There are three methods:
(1) With gold panning out after artificial disc placer gold grains dropped;
(2) With the amalgamation within the cylinder were mixed with mercury amalgam heavy sand obtained after discarding;
(3) Artificial extract gold panning or amalgamation, heavy sand processing plant concentrate feed concentrates, respectively recycling all kinds of heavy minerals with magnetic, electrical Selected methods.
Gold placer gold recovery elections: two for 70-74% sorting chute, chute roughing, scavenging jig, shaking selection process is 75-80%.
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