Introduction to tin ore dressing method

The ore dressing method is determined by its own characteristics. Since the density of cassiterite is larger than that of symbiotic minerals, the traditional ore dressing process of tin ore is gravity beneficiation. In recent years, with the passage of time, the size of the cassiterite in the ore selected has been continuously thinned, resulting in the sulphur flotation process. Further, since tin minerals often present various iron oxide minerals, such as magnetite, hematite and limonite, these minerals are not well separated cassiterite flotation and reselection, so in recent years Magnetic separation operations have occurred in the tin ore dressing process.

Take the Yunxi company mine as an example: most of them use the floating-heavy beneficiation process of the Daxie plant sulphide ore workshop for more than 30 years. The process is: the original ore is crushed to 20mm, and a closed-circuit grinding to 0.074mm (200 mesh) accounts for 60%~ 65%, mixed flotation, one coarse and two sweeping one fine; copper sulfur separation grinding to 0.074mm accounted for 95% one coarse two sweeping three fines, copper concentrate, sulfur concentrate; mixed flotation tailings and then selected sulfide Re-election. After the first and second stages of bed selection; one re-washing; mud selection; tin coarse concentrate desulfurization flotation, tin concentrate, rich medium ore.

Changpo Concentrator is one of the selected factories of Dachang Mining Bureau. The ore dressing process is as follows:

First, the raw ore is crushed to -20mm and then sieved into two grades of 20~4 and 4~0mm, and 20~4mm is preselected into the heavy medium cyclone. The heavy medium cyclone heavy product is pre-selected by jigging after a rod mill. The jigging tailings is screened with 2mm vibrating screen to remove +2mm as waste tailings, and -2mm into the shaker. The jigging and shaker concentrates and medium mines are divided into two systems based on grades, which are regrind and mixed flotation. Flotation tailings shaking sorting Conformanceand tin concentrate; mixed and then finely ground flotation concentrate for flotation separation of lead zinc, antimony and lead, respectively, outputs concentrate and zinc concentrate. The re-selected slime enters the Φ300mm cyclone, and the overflow is removed by the Φ125 and Φ75mm hydrocyclones. The sedimentation is concentrated and floated for desulfurization.

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