筛分作业能排除20-40%的废石(砾石、卵石),是砂金选矿不可缺少的作业。合理筛分参数的确定必须依据原矿砂中金的力度组成的测定资料。目前我国砂金矿山选择的筛孔一般为10-20毫米,如用固定溜槽做粗选设备时筛孔可大些,但不能超过60毫米。固定选厂的筛分设备多为格筛、振动筛,采金船则用圆筒筛。筛上冲水不但能提高筛分效率,还能进一步碎解胶泥,所以砂金矿的筛分作业多为水筛。水筛冲水量根据洗矿要求确定,并应尽量满足下段选别作业对浓度的要求,如系溜槽粗选则冲水量应为砂矿矿量的8-14倍。
Waste screening can eliminate 20 to 40 percent (gravel), is an indispensable operation gold dressing. To determine the reasonable screening parameters should be determined according to the original gold ore strength composition data. The pores of placer gold mines in our country is generally 10 - 20 mm, such as the use of fixed chute do roughing equipment aperture can be larger, but not more than 60 mm. The screening equipment of the fixed plant is mostly lattice sieve, vibrating screen, and the screen is used for the gold mining. Sieve flushing can not only improve the screening efficiency, but also further broken clay, so screening placer for water sieve. Water sieve water flushing quantity according to the ore washing requirements are identified, and we should try our best to meet under the sorting operation on the concentration of the requirements, such as the Department of sluice roughing is washed in water for the placer ore reserves 8 - 14 times.
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