1TPH (12TPD) Stibnite Antimony Flotation Plant In Pakistan

(1) Feeding and Crushing:

The system comprises a chute feeder, jaw crusher, hammer crusher, and belt conveyor. Raw ore with a maximum particle size of 150 mm is loaded into the hopper by an excavator or loader and then evenly fed into the jaw crusher through the chute feeder, where it is reduced to 0–50 mm. The crushed material is subsequently transported via belt conveyor to the hammer crusher for further size reduction to 0–10 mm and finally delivered to the transfer hopper.

Note: The customer requires that the raw ore feed particle size be controlled to less than 150 mm. The crushing system has a capacity of 2 tons per hour and operates for 10 hours per day. Customization is available upon request.

(2) Grinding and Classification:

A closed-loop grinding circuit consisting of a ball mill and a spiral classifier is employed. Fine ore (0–10 mm) is uniformly fed into the ball mill for grinding via an electromagnetic feeder and belt conveyor. The discharged material enters the spiral classifier for classification. The coarse particles (classifier return sand) are sent back to the ball mill for regrinding, while the overflow (fine particles of –200 mesh) is pumped to the mixing tank to ensure that the flotation feed particle size meets the required specifications.

(3) Mixing and Pulp Preparation:

The –200 mesh slurry is introduced into the mixing tank, where flotation reagents (including collectors, frothers, modifiers, etc.) are added and thoroughly mixed to prepare the pulp for flotation operations.

(4) Flotation:

The flotation system consists of a mixing tank and flotation machines. Its function is to produce high-grade antimony concentrate. The –200 mesh slurry from the spiral classifier is pumped to the mixing tank for slurry and reagent mixing. The conditioned slurry then proceeds to the flotation machine process, which is divided into roughing flotation, scavenging flotation, and cleaning flotation.
Based on the customer’s raw ore grade of 25%–40%, our engineer recommends the following flotation configuration:

• 1-stage roughing flotation: 5 flotation cells, model SF-0.37
• 2-stage scavenging flotation: 3 + 3 = 6 flotation cells, model SF-0.37
• 2-stage cleaning flotation: 3 + 2 = 5 flotation cells, model SF-0.37

After the flotation process, the customer can obtain antimony concentrate with a maximum grade of 60%+.

Note: The customer’s requirement for the grinding and flotation system is 1 ton per hour, operating for 20 hours per day. (Customization is available upon request.)

(5) Concentrate Dewatering:

The concentrate slurry from flotation is first thickened in a thickener to a concentration of 40%–45%. The overflow (clear water) from the thickener is recycled for production use, while the underflow is fed into a disc vacuum filter for dewatering, ultimately producing an antimony concentrate filter cake with an acceptable moisture content.

Note: The customer requires a filtration system for the final concentrate. (The design can be customized.)

(6) Tailings Treatment:

Flotation tailings are pumped to a tailings dam. The flotation reagents used are non-toxic and harmless. A small amount of lime may be added to the tailings to promote the settling of suspended solids and residual reagents, ensuring that the tailings remain environmentally friendly.