subject: Spiral Grader, Hydraulic Lead-zinc Ore Dressing Equipment [print this page] Mechanical screening can easily screening of coarse material greater than 2mm, split into various fractions, but less than 2mm of fine-grained materials, mechanical screening has been powerless. Otherwise, the screening efficiency is low, the screen wear out quickly. Fine-grained material, usually less than 2mm using hydraulic classification, rather than screening. The spiral lead-zinc ore dressing equipment classification shall be guilty of this type.
Hydraulic classification is the most common process in the wet concentrator. Hydraulic classification process is divided into different fractions depending on the settling velocity of mineral particles in aqueous media. Mineral particles of the proportion of the basic phase at the same time, mineral particle settling velocity is a function of the size of the ore particle size. Large particle size, settling velocity of large and fast, otherwise small and slow. Therefore, according to the settling velocity of mineral particles , it can prodeuce different grain size.
Spiral grader is widely used in the concentrator to shunt mineral sand with the ball mill , forming dubbed closed circuit. In the gravity concentrator, it is used for grading sand and mud, and in metal beneficiation process for the pulp particle size classification, and in ore washing operations for desliming, dehydration and other operations. The machine has the advantages of simple structure, reliable work, convenient operation and other characteristics.
Hydraulic lead-zinc ore dressing equipment grading machine according to the flow of the different mode of action of mineral particles, it can be divided into two types: centrifugal and gravity. Each score rose to supplement the flow type and increased by supplementary water type. When there is an upward supplementary water, the classification accuracy is significantly improved, the accuracy can reach requirements. No rise in complement the action of water, the classification accuracy can only reach 300-600 hydraulic mineral concentration equipment grading machine can be different according to the classification of space forms, number and unloading equipment, and further is divided into the tapered lead-zinc ore dressing equipment grader and box (box type) lead-zinc mineral processing equipment.
Spiral grader working process:
The classification process is that , firstly send sand slurry (sand and water slurry weight fraction 250-400), into the bottom of the bearing material (the distance from the overflow of the full-length 1/4 to 1/5); fine particals in the sand slurry under the action of water and stir role of the helix, through the overflow weir is discharged; sedimentation of coarse particles in the bottom by the rotating spiral are pushed to the upper end of the discharge of dressing equipment grader.
