Table of Contents
What is semi-autogenous grinding?
Mills that grind hard ores with fracture characteristics that do not lend themselves to fully autogenous milling are charged with a small amount of steel balls to assist in the size reduction. These are known as semi-autogenous grinding (SAG) mills. In the mining industry all of these types of mills are in use.
What is autogenous grinding?
Autogenous grinding is a process of grinding ore in a rotating cylinder, using large pieces of the same ore. Autogenous mills operate mechanically like ball mills; however, the media used for grinding differs.
What does semi-autogenous mean?
An autogenous or semiautogenous circuit, as the name implies, uses the ore itself to assist in the grinding process. In this type of circuit, the ore must be competent so large chunks of ore can be used to grind smaller chunks of ore.
Is grinding mill and ball mill the same?
A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints. Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium.
What is the difference between a SAG mill and ball mill?
The working principle of the self-grinding machine is basically the same as the ball mill, the biggest difference is that the sag grinding machine uses the crushed material inside the cylinder as the grinding medium, the material constantly impacts and grinding to gradually pulverize.
What are mill scats?
scats means material in a ball mill or sag mill that has become rounded and no longer susceptible to additional size reduction. Basically, this material may be rejected from the grinding circuit for additional crushing because it contributes to higher energy consumption within the mill.
What is the difference between a SAG mill and a ball mill?
What is the purpose of SAG mill?
SAG mill is usually used to grind large pieces into small pieces, especially for the pre-processing of grinding circuits, thus also known as primary stage grinding machine.
Which machine is used to grind a grain?
mill
A mill is a factory or plant, especially one that’s equipped for grinding grain into flour. The facility is a mill, and the machine that does the actual grinding is also called a mill.
Is milling the same as grinding?
While they both involve the physical removal of material from a workpiece, milling and grinding aren’t the same. The former machining process is characterized by the use of a milling machine, whereas the latter machining process is characterized by the use of a grinding wheel.
What is cone crusher?
Cone crushers are popular rock crushing machines in aggregates production, mining operations, and recycling applications. They are normally used in secondary, tertiary, and quaternary crushing stages.
Is grinding more efficient than milling?
Nowhere is this more evident than when you are deciding whether you need a CNC milling machine or a grinder for deeper cuts and higher material removal rates (MRR). Milling and turning were the legacy processes used for higher-speed material removal. Grinding was the solution for more accurate work, such as finishing.
What is difference between machining and grinding?
Machining is one bulk material removal process (i.e. high MRR). Thus it is economical and suitable to give proper size and also for semi-finishing. Grinding has low material removal rate and is preferred only for finishing. Accuracy and tolerance achieved by conventional machining operations are not so good.
What is the difference between autogenous grinding and grinding mills?
Grinding mills in which comminution takes place without grinding aids are known as autogenous grinding (AG) mills or fully autogenous grinding (FAG) mills. These mills use large lumps of rock as the grinding media. Mills that use intermediate size rock or pebbles as a grinding medium are also autogenous mills but are known as pebble mills.
What is autogenous and semi-autogenous uranium grinding?
Autogenous and semi-autogenous mills have been very successful on relatively soft uranium ores where the values are frequently found in the material that cements the sandstone grains together. When an ore is hard and competent, there is always the possibility that it would make good “pebbles” which could be used for fine grinding media.
What is an intermediate autogenous mill?
b. Intermediate autogenous mills (or intermediate pebble mills) which process a fine crushed product (minus 5/8″ to minus 1″) obtained from an intermediate crushing plant. The grinding media in these mills are rock pebbles of suitable size (3″ to 6″) screened out of the intermediate crushing circuit.
What is an autogenous grinding circuit?
In autogenous grinding, the ore “says” how it wants to be ground and the product size that it will produce, and does not change in response to the same factors. With some ores there are two possible products from an autogenous grinding circuit — a coarse product or a fine product.