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The selection of tungsten ore beneficiation equipment is mainly based on the tungsten ore beneficiation process. No matter what kind of tungsten ore, the beneficiation process basically follows: pre-selection operation, separation operation and post-selection dehydration operation. The following editor will introduce the commonly used equipment at each stage of Wu Mine.
General tungsten ore pre-selection operations mainly include crushing and screening, hand selection, pre-selection, grinding and classification.
Crushing and screening: Crushing and screening mostly adopts a two- to three-stage closed-circuit process. Taking three-stage and one closed-circuit process as an example, after the raw ore is initially deslimed and classified by the vibrating screen, it is screened The upper material (+150mm) enters the jaw crusher and is crushed to -150mm. After entering the second stage of desliming and classification, the upper material (-150mm~+50mm) enters the third stage of desliming and the middle particles (-50mm~+23mm) are screened. ) enters the four-stage classification desliming, and the undersized material (-23mm~+6mm) enters the pre-selection stage, while the undersized material after the primary screening of the raw ore enters the spiral classifier for classification and desliming, and the overflow enters the second-stage desliming and classification operation. The flow enters the fine mud section.
Hand selection: After three or four desliming and classification processes, manual selection sections are set up above and below the screen to select qualified tungsten ore blocks.
Pre-selection: The jig-grading process is often used. The materials under the second stage screen directly enter the pre-selection stage, the materials above the screen enter the jig machine for re-selection, and the re-selected qualified materials enter the selection stage. The rest enters the spiral classifier for classification, the overflow enters the sorting stage, and the low flow is treated as primary fine mud.
Grinding classification:Due to the brittle nature and large specific gravity of tungsten, over-grinding is prone to occur during grinding and secondary mud is produced, which in turn affects the separation operation. Therefore, tungsten ore Rod mills are often used for grinding ore to reduce over-grinding problems. One to two stages of grinding process can be used.
Commonly used mineral processing equipment at this stage are: circular vibrating screen, jaw crusher, spiral classifier and rod mill.
The tungsten ore separation process mainly includes rough separation, fine separation Select and treat three parts with fine mud.
Rough selection: Gravity selection is the main method and multi-stage jigging, multi-stage shaking table, and medium ore regrinding processes are often used. Among them, taking three-stage sorting as an example, the pre-selected ore particles are sent to the vibrating screen and screened into three levels: coarse, medium and fine, and then enter the jigging operation respectively to obtain qualified coarse, medium and fine concentrates. The jig tailings enter the hydraulic classifier for classification, the underflow enters the rod mill for re-grinding, and the ground products return to the vibrating screen, forming a closed loop; the overflow enters the shaking table for sorting, and the tailings are discarded during the shaking table operation.
Selection: Tungsten ore after rough selection also contains other useful associated elements, so tungsten concentrate and other associated elements need to be obtained through selection. Generally, flotation- Heavy or float-gravity-magnetic combined processes.
Fine mud treatment:After the primary and secondary fine mud are concentrated by the thickener, the sand enters the classifier, and the sand at each level enters the shaking table for classification. The tungsten ore is first coarse and swept twice, and the secondary mud is coarse and swept. It is overflowed and mixed and sent to the centrifuge. After one coarse and two fine separations, qualified tungsten ore is obtained.
Commonly used mineral processing equipment at this stage are: jigs, shakers, centrifugal concentrators, thickeners, dry magnetic separators, and Taiwan flotation machines.
Tungsten ore dehydration operation after beneficiation It can be divided into two parts, one is the dehydration of tungsten concentrate, and the other is the dehydration of tungsten tailings.
Tungsten concentrate dehydration: Generally, the concentration-filtration method is used. The slurry after concentration is pumped from the pump box to the concentrator by the slurry pump for concentration. The overflow water can be returned to the secondary Secondary utilization, the low flow is sent to a disc filter for dehydration to obtain tungsten concentrate.
Tungsten tailings dehydration: Generally, a two-stage concentration-stage dehydration and filtration method is used. The tailings are sent to the cyclone for gravity classification, and the overflow and water are sent to Concentrator, the clarified water after concentration can be returned to the factory for recycling. The low flow of the cyclone is sent to the dehydration screen. The moisture content of the upper product is as low as 20% and is drained dry. The lower product is sent to the filter for filtration. The final content The water content is reduced to 15%-18% and then drained dry.
Commonly used mineral processing equipment at this stage is: high-efficiency thickener, slurry pump, hydrocyclone, dewatering screen, and disc filter.
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