Difficulty of ore crushing

The strength of the ore that resists external forces during the pulverization process is called the difficulty of ore crushing.
For mechanical crushing, the ore is crushed and the difficulty level of the ore to be broken; for mechanical grinding is also known ore grindability.
There are many factors that determine the difficulty of ore crushing, and the important factor is the nature of the ore. In terms of ore properties, the main factor is the hardness of the ore. In the mining industry, one percent of the compressive strength limit σ pressure (kg/cm ² ) of the ore is used as a measure of the hardness of the ore, ie:

Where f is the ore hardness coefficient of the ore;
Sigma pressure - the limit of compressive strength of ore, kg / cm ² .
The larger the F value, the higher the hardness grade of the ore.
At present, the ore dressing industry lacks suitable standards for dividing the ore friability and grindability, but by means of the ore hardness commonly used in the mining industry, the ore crushability and grindability standards are temporarily classified. Because, in general, the greater the hardness of the ore's hardness, the harder the ore is to crush and grind, the greater the energy consumption for crushing and grinding.
The hardness coefficient and friability and grindability coefficient of ores commonly used in industry are listed in the following table:

For example, the hard grindability coefficient of the hard ore in the table is 0.5-0.7, which means that if a certain grinding machine grinds medium-hardness ore with a productivity of 32 tons/hour, under the same grinding condition, the grinding is very hard. The productivity at ore is only 16 to 22.4 tons per hour.

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