Gravity Stamp
Some crushers specially designed for specific ores or
materials can lie installed and operated economically for that particular
material. Most of these special crusher have been employed in the past and new
very few industries make use of these, since the requirements have been met by
making changes in designs of universal machines. Among this category the most
commonly employed in the past in the gravity stamp used in gold are making
whereas some others such as Bradford beaker,
disk crushers, etc have been used for soft materials.
Some of these machines can be used for coarse crushing,
whereas some can be employed for fine crushing.
Gravity stamp mills are one of the oldest methods for size
reduction in the intermediate and fine size ranges, loath are obsolete now. The
stamp is an impact crusher and operates on the principle of mortar and pestle.
Gravity stamp mill consists of the mortar box on a concrete block in which
crushing is accompanied by 5 (or 10 ) stamps ( beary blocks).
The stamps are raised by can operating under collars fastened
to the upper past of the shaft and drop by their own weight on a hard metal
slab. The ore is introduced continuously in the mortar, which falls on the
block. The crushing operation is carried out in aqueous pulp. Its reduction
ratio is quite high upto 150 ( 8 am piece can be reduced to 0.05 am) and thus
in the past stamp mills have done a great service in crushing of gold ores for
amalgamation.