Alluvial tin extraction is similar to alluvial gold beneficiation, and usually screening, ore washing, and gravity separation processing are involved. I.e. gravity separation is the only rough separation method for alluvial tin and alluvial gold mine. That is because tin and gold content is low comparing with other minerals, and kind of high-efficient and energy-saving extraction method and equipment shall be needed to enrich tin and gold from the alluvial mines. And here gravity separation is, obviously, kind of an ideal beneficiation method to get high grade tin and gold concentrate. Here is some information about alluvial tin extraction and tin extraction machine from Forui.

The following picture is about the test of alluvial tin extraction by jigging. The upper part is about the raw tin ore while the down part is about tin extraction from tin extraction machine-jig separator.

A great enrichment efficiency can be seen from the picture. Actually, a complex processing of screening-ore washing-jigging upgrading is needed to get high grade tin concentrate in the picture.

1. Alluvial tin ore washing plant

There are many stones or gravels without any tin element in the raw alluvial tin ore, and this will lower the following gravity separation. So the first step is to remove the stone blocks from the raw ore to improve the handling capacity and guarantee the enrichment efficiency. The common screen for alluvial tin ore is rotary screen like the picture above shows.

2. Alluvial tin ore washing equipment

For alluvial tin ore with a lot of sticky clay, ore washing is needed to break the clay blocks besides screening. This will lower the possibility of tin coated by clay and improve the recovery rate and concentrating efficiency as well. The ore washing machine for alluvial tin ore is usually rotary washing machine, ore log washer.

3. Tin extraction machine-gravity jig separator

There are still a lot of impurities after screening and ore washing processing, so gravity separation is needed for tin extraction as further enrichment. And here the gravity separators are required of large handling capacity and high recovery rate. The low efficient gravity separator of small capacity like shaking table and spiral chute will be out of consideration here.

 Jig machine is usually used as gravity separator and can be chosen as tin extraction machine. The main jig separator for tin extraction is trapezoidal jig separator and down-driven jig separator. Generally, high grade tin concentrate can be gained after jig gravity separation for alluvial tin of high single separation degree. For alluvial ore of low single separation degree, further milling will be needed to gain ideal beneficiation efficiency. Here gravity separation as rough separation not only lower the floatation cost and the plant investment, but also gain final concentrate for ore of high single separation degree. Therefore, as a tin extraction machine, gravity separation and gravity processing machine is essential to alluvial tin extraction. The following pictures are about the beneficiation site of alluvial tin ore in Indonesia.

Here as a professional manufactures of  tin extraction machine, Gongyi Forui Machinery Factory can do tin extraction test for free if samples can be available. And flow sheet and plant allocation can be designed according to the trial.