Down-flow preselection spiral classifier

Abstract

The invention discloses a down-flow preselection spiral classifier. The down-flow preselection spiral classifier is formed by reasonably combining a down-flow magnetic preselection machine and a spiral classifier body. The down-flow magnetic preselection machine consists of an ore feeding opening (1), an ore feeding box (2), a stander (3), a selecting trough (4), an ore discharging valve (5), an ore discharging pipe (6), an overflow pipe (7), a magnetic system (8), a round tube (9), an ore concentrate trough (10), a flushing water pipe (11) and a round tube drive mechanism; the spiral classifier body consists of a lifting frame (12), a lifting mechanism (13), a helix (14), a classifying trough (15), a spiral drive mechanism, a spiral supporting seat and an overflow opening (19); the overflow pipe (7) and the ore discharging pipe (6) are accessed to the classifying trough (15). The down-flow preselection spiral classifier has the advantages of simplicity in structure, convenience in use, disassembling and installation and wide application range, the qualified magnetic ore can be selected in advance, the down-flow preselection spiral classifier is particularly suitable for the preselection and granularity classification of ores containing magnetic minerals in a mineral separation factory, the classifying efficiency can be improved, the excessive abrasion of the magnetic minerals can be avoided, the ore separation energy consumption is reduced, and the ore recovery rate can be increased.

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, overgrinding 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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