正常情况下选金是需要水来进行的，但是在戈壁滩、沙漠这些连水都喝不上的环境下选金是非常困难的。但是我公司经过多年研发制造终于研发处了可以在无水、缺水环境下选取沙金的设备，那就是沙金干选机，又称之为风选沙金设备，干选砂金设备，旱地沙金选矿设备。这套设备的特点就是无需水就可以选金。这套设备是利用风进行选金的，所以这套设备也叫沙金风选机。可能这时候就会有人问了：风是怎么选金的呢？答案就是：该设备是利用风吹所产生的涡流使重量轻的物体进行悬浮，重量重的物体会沉积在卡槽里面。因为沙土的比重小而黄金的比重大，所以风在能够把沙土吹走的什么却吹不走金、银、铂、钨等比重大的物体。沙土全被吹走后卡槽里留下的就是金了。
众所周知，空气和水都作为自然界中的一种物质，空气属于气态物质，水则属于液态物质，但在选矿过程中都称为介质，空气的比重远远小于水的比重，所以在重选矿上，风选更胜于水选。
该设备的问世完全打破了在无水环境下不能选沙金方面的空白。而且其回收率可以与沙金水套离心机（即尼尔森离心机）相媲美，面金70%，片金80—90%，颗粒金高达90%以上，最高选取粒度120目，富集比为4000:1。所以说在选择沙金提取设备的时候完全可以选择我公司生产的沙金干选机。
Under normal circumstances, gold is the need of water to, but in the Gobidesert, these do not even drink water environment gold is very difficult. But my company after years of R & D and manufacturing R & D department finally can choose the alluvial gold in anhydrous, water shortage under the environment of equipment, that is, placer gold separator. The characteristics of this set of equipment is no water can select gold. This set of equipment is gold by the wind, so this set of equipment is also called sand gold wind sorting machine. Maybe when someone will ask: how is wind gold selection? The answer is: the device is suspended by the vortex wind generated the light weight of the object, the weight of heavy objects will be deposited in the card slot. Because the sand proportion is small and the proportion of gold, so the wind can blow away the sand in what was blow away the gold, silver, platinum, tungsten geometric major objects. Full blown away the sand after the slot in the left is gold.
It is well known that air and water as a substance found in nature, the air belong to gaseous substances, water is a liquid substance, but in the dressing process are known as the medium, the proportion of the air is much smaller than the proportion of water, so in the gravity mines, fanning more than water.
The appearance of the equipment completely broke the blank in anhydrous environment should not choose the alluvial gold aspect. But the recovery rate can centrifuge and alluvial gold jacket (i.e. Nielsen centrifuge) comparable to that surface gold 70%, 80 - 90% pieces of gold, gold grains are as high as 90% or more, the highest selected granularity 120 mesh, the enrichment ratio was 4000:1. So extraction equipment can completely when the choice of alluvial gold dry separation equipment produced by our company in the choice of alluvial gold.
