Grading equipment and characteristics commonly used in concentrators
At present, the domestic gold beneficiation plant is the most commonly used grading equipment spiral classifier hydrocyclones, rake classifiers can still be seen floating trough classifier and in a handful of old plants, but the latter have been eliminated, stop making.
1. Spiral classifier The specification of the spiral classifier is expressed by the number of spirals and the diameter of the spiral. According to the number of spiral axes, it can be divided into single spiral and double spiral classifiers. According to the height of the overflow weir of the spiral classifier, it can be divided into three types: low-lying type, high-lying type and submerged type. The following three figures are shown.
Low-lying classifier: The position of the weir is lower than the center of the spiral bearing at the overflow end (Fig. 2). The settlement area is small, the agitation is large, and the overflow capacity is low. It is generally suitable for washing and de-sludge.
Sorghum classifier: the position of the weir is higher than the center line of the lower screw axis, and lower than the upper edge of the spiral blade (Fig. 2-27). The length of the graded liquid surface is not large, and the liquid level can be directly affected by the spiral blade. It can be used as a coarse grain classification with a graded particle size of 0.15 mm or more. Usually used in a grinding process.
Submerged classifier: The spiral at the overflow end is completely immersed under the overflow surface of the slurry (Fig. 3). The settlement area is large and balanced, suitable for fine-grained classification, and the classification granularity is below 0.15 mm. Mainly used in the second stage grinding grading process.
The spiral classifier has a simple structure, is convenient to configure and operate with the grinding machine, and has a large height for returning sand, which is convenient for self-flow connection with the grinding machine, and the classification belt is relatively stable, and a fine overflow can be obtained. However, its classification efficiency is not high, generally 40 to 60%.
3. Hydrocyclone The structure of the hydrocyclone is shown below.
The upper part is a cylindrical outer casing and the lower part is a conical outer casing 4. The mine pipe 1 is attached to the peripheral wall of the cylindrical casing, and an overflow pipe 3 is mounted on the top, and a sand nozzle 5 is attached below the cone cylinder. The feeding pipe, the sand discharging nozzle and the casing are easy-grinding parts, and the inside is lined with a lining of a wear-resistant material (such as diabase cast stone or wear-resistant rubber), and is easily replaced after being worn.
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