Home Blogs Gravity Separation 4 Knelson Gravity Concentrator Configurations You Need to Know

4 Knelson Gravity Concentrator Configurations You Need to Know

ShirleyShirley Aug 27, 2021Aug 27, 2021 531531
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Knelson centrifugal concentrator is an efficient gravity separation equipment, which can reduce the lower limit of the particle size of the target minerals and increase the recovery rate of gravity separation,often used for gold separation. Since the feeding particle size of the knelson concentrator must be less than 6mm, it is necessary to remove materials larger than 6mm in advance with screen, and this part of the material directly enters the classifying equipment or ball mill. This article will take you to understand 4 common Knelson concentrator configurations.

01 Stationary Grizzly Screen + Knelson Concentrator + Classifier

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This configuration divides the ball mill's ore discharge into undersized material and oversized material by stationary grizzly screen. The oversized material goes directly into the classifier for classification. The undersized material is fed to the Knelson concentrator for gravity separation and recovery of native gold. Knelson gravity separation tailings are transferred by slurry pump to classifier for classification.

The advantage of this configuration is to make full use of the height difference between the ball mill and the classifier. The large particle ore is fed directly to the classifier, which reduces the wear of the pump caused by the large particle ore feeding. The disadvantage is that the stationary grizzly screen are often blocked, which will make the screening effect of minerals unstable. The amount of undersized material from large to small, and the screening efficiency is low, which reduces the recovery rate of knelson gravity separation.

02 Linear Vibrating Screen + Knelson Concentrator + Classifier

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This configuration process can make the monomer dissociated minerals go through knelson gravity separation directly and recover the natural gold in the ore. Then the tailings are pumped to a classifier for classification.

However, in this configuration process, due to the height difference between the ball mill and the classifier, most mineral processing plants cannot directly install the linear vibrating screen. This configuration process is difficult to implement and rarely used in practice.

03 Linear Vibrating Screen + Knelson Concentrator + Hydrocyclone

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This configuration process can make full use of the height difference between the equipment to realize the automatic flow of the slurry, reduce the use of pumps, make the process simple to operate, and easy to realize automatic control. The recovery of native gold in the ore which has achieved monomer dissociation is more thorough and the recovery index of knelson gravity separation is high. When using this configuration process, the overflow ball mill can be used for grinding. A reverse twisting cage screen should be installed at the discharge end of the ball mill to avoid the discharge of large ore and broken steel balls, reduce the wear of the pump, and ensure that the hydrocyclone has a better classification efficiency.

04 Jig + Knelson Concentrator + Classifier

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This process is to feed the concentrate of the jig to the knelson concentrator and then enrich it to obtain gross gold products. The tailings of the jig machine are pumped to the classifier for classification. In this process, the jig machine is used as separation machine as well as screening machine.

This solves the influence of large-particle materials on Knelson gravity separation and improves the recovery rate of simple jig gravity separation. The disadvantage is that the jig machine has limitations in recovering fine particles of native gold. The fine particles of native gold that dissociated part of the monomer cannot enter the knelson concentrator for separation, which affects the recovery rate of gravity separation. The use of jigs increases water consumption, and sometimes it must be dehydrated to ensure the operating conditions of the next process, which makes the process complicated and difficult to control.

05To Wrap Up

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The above are the four configurations of Knelson gravity separation process. The proper gravity separation process should be selected according to the properties of target minerals. The recovery rate of gravity separation should be improved as far as possible to realize the principle of early and more harvest.

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