Patent ID: 8777135

Claim:
A cooling arrangement for use in a process of preparing a fine powder, and comprising: a vertical cooling chamber having a first opening at a top end portion and a second opening at a bottom end portion; a solid particles feed ingress mechanism that deposits solid particles having an averaged diameter of less than 6 mm in said first opening; a solid particles mechanical mixing mechanism located in said cooling chamber at the bottom end portion thereof; a plurality of cooling air discharging devices; and a solid particles egress mechanism in communication with said second opening that removes said solid particles, wherein said solid particles feed ingress mechanism is configured to enable the deposited solid particles to free fall from said first opening to said bottom end portion while being cooled during such free fall by the cooled air from said plurality of cooling air discharging devices, and the deposited fallen articles are mixed and stirred by said mechanical mixing mechanism so that no big lumps of particles are formed.