Raymond Ring-Roller Mill

Petroleum coke is generally pulverized for the manufacture of electrodes ring-roller mills with air classification and tube mills are generally used. A No. 5057 Raymond ring-roller mill gave an hourly output of 3.8 tons, 78.5 rcent through No. 200 sieve, with 67 kW (90 hp). 

A Raymond 5057 ring-roller mill pulverizing fluorspar produces 4500 kg (10,000 lb) of product per hour 95 percent minus 200 mesh with 104 kW (140-hp) operating power, or 26 kWh/Mg (23.4 k 4i/ ton). Fluorspar is also ground in continuous-tube mills with classification. 

Sulfur The riug-roUer mill can be used for the fine grinding of sulfur. Inert gases are supplied instead of hot air (see Properties of Sohds Safety for use of inert gas). Performance of a Raymond No. 5057 ring-roller mill is given in Table 20-34. The total cost might be 3 to 4 times the power cost and include labor, inert gas, maintenance, and fixed charges. 

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