A Downstream Preselection Spiral Classifier

Abstract

The invention discloses a downstream preselection spiral classifier, which is composed of a downstream magnetic separation preselector and a spiral classifier. The downstream magnetic separation pre-separator is composed of ore feeding port (1), ore feeding box (2), frame (3), sorting tank (4), ore discharge valve (5), ore discharge pipe (6), overflow The flow pipe (7), the magnetic system (8), the cylinder (9), the concentrate tank (10), the flushing water pipe (11), and the cylinder driving mechanism; the spiral classifier consists of a lifting frame (12), a lifting mechanism ( 13), screw (14), classification tank (15), screw drive mechanism, screw support, overflow port (19); overflow pipe (7), ore discharge pipe (6) connected to the classification tank (15 )middle. The invention has the advantages of simple structure, convenient use, disassembly and installation, and wide application. It can pre-select qualified magnetic minerals, and is especially suitable for the pre-selection and particle size classification of ores containing magnetic minerals in mineral processing plants. It has the advantages of improving classification efficiency and avoiding magnetic minerals. The function of over-grinding, reducing the energy consumption of mineral processing and improving the recovery rate of minerals.

Description

technical field [0001] The invention relates to a magnetic separation and grading equipment in a mine dressing plant, which can replace the spiral classifier and be used for pre-selection and particle size classification of magnetic minerals in a magnetite dressing plant. Thereby improving the classification efficiency, reducing the energy consumption of ore dressing, and improving the recovery rate of minerals. Background technique [0002] In the concentrator, in order to ensure the separation of minerals and gangue, a spiral classifier is often installed. Because the spiral classifier utilizes ore particles to settle in the water medium for classification, the following problems exist in the use of the spiral classifier: the specific gravity of the magnetic ore particles is greater than that of the gangue minerals, and when the particle size is close, the sedimentation velocity of the magnetic mineral ore particles is greater than that of the gangue minerals. Therefore, ...

AI Technical Summary

Problems solved by technology

Because the spiral classifier utilizes ore particles to settle in the water medium for classification, the following problems exist in the use of the spiral classifier: the specific gravity of the magnetic ore particles is greater than that of the gangue minerals, and when the particle size is close, the sedimentation velocity of the magnetic mineral ore particles is greater than that of the gangue minerals. Therefore, the dissociated magnetic mineral particles settle quickly during the grading process, and cannot be discharged from the overflow in time, but enter the sand returned by the classifier, and are connected with other magnetic minerals and gangue minerals. The organisms enter the grinding machine together for grinding, which not only reduces the classification efficiency, but also causes the dissociated magnetic mineral particles to be too finely ground (that is, over-grinding phenomenon), which wastes grinding energy consumption, and the fine magnetic mineral particles are unfavorable for separation and recovery. Reduced recovery of magnetic minerals

[0003] Over-grinding occurs in strong magnetic iron minerals. Although the useful magnetite minerals are fully dissociated, it will also produce more fine particles that are difficult to separate, that is, the phenomenon of "over-grinding" occurs.

Over-crushing not only endangers the separation process, reduces the concentrate grade and recovery rate, but also increases the consumption of the crushing process and the separation process due to "unnecessary crushing", which increases the cost of mineral processing

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