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Grinding Circuit

Autogenous Grinding Mill

Grinding Circuit Classification Process

To beneficiation, it can grind ore into any size economically using one-section grinding or two-section grinding. More than two sections of grinding are often determined by demand of stage separation.

Compared with two-section circuit, one-section circuit's principal advantage is few facilities, low investment, and easy to operate, and one grinding section doesn't influence the other, and shutdown lost less. But the grinding machine is in wide feed size, difficult to load ball reasonably, hard to get the thinner end product and the grinding efficiency is low. When the largest size in demand of the end product is between 0.2~0.15mm (namely 60%~79%-200 item), both them adopted one-section crushing circuit. When the degree of grinding fineness demands in 80%-200 item, one-section crushing circuit can be used in midget plant.

Two-section grinding's greatest strength is that it can get thinner products, and coarse and fine grinding can be in different section, especially apply to processing phase. In large and medium-sized factory, when the smallest grinding fineness is below 0.15mm (namely 80%-200 item), it is economical to adopt two-section grinding, and the composition of product size is homogeneous, and over crushing phenomenon is less. According to the different connection type between one-section mill and the classifier, two-section milling process has three types: the first section is open-circuit; the second section is the whole closed-circuit; the first section is local closed-circuit, and the second section is always the grinding process of closed-circuit.


Series connection

With this type of arrangement, the feed passes both grinding cylinders successively, which results in maximum grinding path lengths and the longest retention times of >12 minutes. This connection is applicable for fairly hard or coarse feed, for very fine end products, for materials which are characterized by poor blending properties, or for long grinding, dissolving, and reaction processes.


Parallel connection

With this arrangement, either cylinder yields a finished product and shorter retention times of 3–12 minutes and higher throughput rates can be achieved. Identical or different materials can be ground, blended, or chemically treated in the two cylinders at the same time. This arrangement is suitable for materials that are easy to grind, for closed-circuit grinding, for simple blending operations and dissolving processes, as well as for chemical reactions of short duration.


Autogenous Grinding Mill Process

Process mill circuitAutogenous grinding process has two styles: dry grinding and wet grinding. Dressing plant almost adopt later. To solve the problem of difficult grinding particles in autogenous grinding, and to rise the efficiency of grinding, put a few steel balls into autogenous mill. Now it is known as semi-autogenous grinding.

Autogenous grinding process usually works together withgrinding equipment such as super thin grinding mill、ball-milling、pebble mill etc. It can constitute lots of technological processes according to its connection.


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