Spiral classifier for mineral beneficiation

Spiral classifier for mineral beneficiation

The description of the spiral classifier:

It is a kind of mechanical classifier with the mechanism of elevating the sink sand, forming the closed circuit with the ore mill. The classification is made by the different settling rate of grains. Besides the preliminary and check classification as the auxiliary equipment of ore grinding, the mechanical classifier can be used for mine washing, desliming and dehydration of clay-containing minerals.

The mechanical classifier can be divided into spiral classifier, rake classifier, and bowl classifier according to the different mechanical mode of transporting the sink sand.

The spiral classifier has a simple structure and easy operation, which is commonly used in China, and is a rectangle chute in appearance, with 12°~18.5°angle of the bottom of slot and shape of the semicircular.

The spiral classifier can be divided into the high weir classifier and immersed classifier according to the height of grading liquid surface. The high weir classifier is applicable for coarse-grained grading, size above 0.15mm, and the immersed classifier is applicable for fine-grained classification, size below 0.15mm. In addition, there is also a kind of low weir spiral classifier, the grading level lower than the spiral bearing on the bottom, with small liquid surface and large agitation, mainly used for the ore washing of mud-containing sand.

 Classification of spiral classifier:

       The classifier is widely used with a ball mill to make a closed-circuit circulation to classify the mineral sands, or to classify ore sand and fine silt in gravity mill. It is also applied to classifying granularities in metal mineral separation, or desliming and dewatering in ore washing. The classifier features simple structure, reliable and easy operation.

     The spiral classifier mainly includes the single spiral classifier and double spiral classifier. According to the different depth immersed by the spiral blade of overflow, it has the following two kinds:

     1, High weir type: the top of spiral blade upper than overflow surface and spiral center lower than overflow surface. Mainly used for the grading of minerals of overflow size 0.83-0.15mm.

     2, Immersed type: spiral blade completely immersed below overflow surface. Mainly used for the grading of minerals of overflow size 0.15-0.07mm.

Working Principle:

Classifier together with cyclone separator, dust catcher and draught fan composes a set of classifying system. The materials move to classifying area at high speed from the bottom end feeding inlet of classifier with the rising air current under the suction of draught fan and the coarse and fine materials are separated under strong centrifugal force of high-speed rotating stage turbine. The fine particles in accordance with demands of particle size enter the cyclone separator or dust catcher through the blade clearances of classifying wheel. After knocking the wall, the coarse particles together with parts of fine ones descend to the second draught fan along the cylinder wall, and separate the coarse and fine particles through intense panning effect of second draught. The fine particles rise to the classifying area for the second classification and the coarse particles descend to the discharge port and are discharged out.

Explanation of model: 

    Like: "2FG-15",in which, "2" indicates double spiral, no indication by the single spiral; "F" indicates the spiral classifier; "G" indicates high weir type, or "C" indicates immersed type; "15" indicates spiral diameter, unit dm.

Main technical parameters of spiral classifier: 

Company Description

Henan Kuangyan Heavy Industry Machinery Co., Ltd. is a joint-stock enterprise which produces large-sized and medium-sized crushers and mills, mining equipments, and light AAC brick/block making machines. 

Under such circumstances, we make full use of the good opportunity and try our best to have a great progress in technical transformation, innovation, improving the quality of products, and continuously expanding the domestic and overseas markets. Through years of development, our products have gained a favorable comment from markets all over the world. As the leading company in crushing & milling fields, we have developed series of newly-designed crushers by absorbing advanced scientific technology & processing experience from abroad and our experts' continuous research. It has been proved that our crushing products have covered a good market share both in domestic and overseas for high quality & easy maintenance. 

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1>.Pre-sale services: enthusiasm

We provide you with the prophase plan, process flow design and manufacturer equipment according to your special demand.

2>.Sale services: servant

Send technicians to the jobsite for guiding the installation and adjustment, training operators and finishing the check and accept together with you.

3>.After-sale services: faithfulness

To establish long term friendship, we will regularly pay return visit to customers. Supplying technique, building design, instruction, installation and debugging for free.

4>.We provide one-year warranty to make sure your machine runs consistently.

We always offering lifelong services and provide spare parts for a long term.