Spiral Classifier

Features

1. energy saving
2. handy for maintenance
3. long service life
4. even particle size

Brief Introduction:

High weir type ore spiral classifier: the top side of spiral blade is higher than the flooding level and the center of the blade is lower than the flooding level. This type is used for classification of ore with flooding size between 0.83-0.15.

Spiral classifiers are widely used in the distribution of ore in closed circuits with ball mills, grading ore and fine slit in gravity mills, grading granularity and flow of metal ore-dressing, and de-sliming and dehydrating in washing.

Working Principle and Features:

Spiral classifier is a kind of classifying machine that classifies big and small mineral granules. It works according to the fact that different granules (with various sizes and weight) sink at different speeds in liquids. It can filter powders grinded from mill and rotate the coarse materials to the feeding hole of the mill and discharge filtered fine materials though the overflow pipe.

Single screw Classifiers are suitable for

1. Separation of fine particles and liquid from coarse particles

2. Separation of light particles from heavy particles

3. Separation of the particles into a number of products graded according to size

4. Separation of liquid from solid particles

Main features of Single Screw Classifiers

1. Adjustable weirs

2. Sealed, submerged bearing

3. Optional automatic lubrication system

4. Rigid tank and substructure

5. Wide choice of tank design

6. Overflow collection box

7. Wide range of industries serviced

8. Single spiral range from 300 mm to 2 200 mm

9. Duplex spiral models 1 500 mm and 2 200 mm

Main benefits of singe screw classifiers( ore selecting machine)

1. Energy saving

2. Heavy duty, rugged construction

3. Powerful self-contained spiral lifting device

4. Continuous spiral raking

5. Optimal particle size range 800 to 75 microns.

Description

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 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.

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.

Technical parameters of classifier: