The density of tin ore is larger than the paragenetic mineral, so the mining process of tin ore is gravity separation. However, all kinds of iron oxides exist in those ore, like magnetite, hematite, etc., which cannot be well separated by using gravity or flotation separation. Herein, magnetic separation and flotation separation will be used.
Crush the raw ore to 20mm, then screen it into two particle sizes, (20mm~4mm) and (4mm~0mm).
Put the 20~4mm ore into heavy medium cyclone to be selected. Then the ore will enter into the rod mill. After that, it will be preselected in jig. The tailings over 2mm will be abandoned, and the ore below 2mm will be put into shaking table.
The concentration from jig and shaking board will be separately selected by bulk flotation. The tailings will enter the shaking board to get qualified tin concentrates.
After the bulk flotation, the concentrate will be fine grinded, then will be do the flotation separation of lead zinc ore. After that Lead antimony concentrates and zinc concentrates will be produced.
The tin pulp enter into Φ300mm hydrocyclone, then overflow to Φ125mm and Φ75mm hydrocyclone group to remove the fine mud. The sand setting will enter into the process of thickening, desulphurization by flotation, and then cassiterite flotation.
Xinhai is a tin ore dressing plant, which adopts the flotation-gravity beneficiation process. After crushing the raw ore to 200mm, it adopts a closed-circuit grinding, and grinding to 200 mesh accounts for 60~65%. The flotation adopts a process of one roughing, two sweeping and one refining, and the copper and sulfur are separated and ground to 0.074mm, accounting for 95%. Then, the mixed flotation method is used to re-separate the tailings after the sulfide selection, and pass through the first and second stage bed selection; one-time rewashing;
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