METHOD OF LEACHING FOR BAUXITE PULP, FACILITY (VERSIONS) AND HEAT-EXCHANGER FOR ITS INMPLEMENTATION Russian patent published in 2008 - IPC C01F7/06 F28D7/00 

FIELD: metallurgy.

SUBSTANCE: group of inventions concerns manufacturing of alumina during the process of bauxite pulp leaching. Method includes heating of initial pulp during its movement in heat-exchanging pipes bundle of shell-and-tube heat exchanger, withdrawing from stream of heated leached pulp, its heating till specified final temperature in shell-and-tube heat exchanger by direct steam, fed from outside, cooling of heated leached pulp with withdrawing heat transport to the stream of initial pulp. Cooling of leached pulp is implemented at it movement in heat-exchanging pipe bundle, and heat transport from heated leached pulp to the stream of initial pulp is implemented by means of usage thermosyphon effect by means of buffer medium, in the capacity of which it is used steam and condensate of water steam. At that initial pulp is fed to condensation zone of thermosyphon, and leached pulp - into its evaporation zone. Facility (the first version) contains heat-exchanger with double horizontally - piped bundles, where evaporating and condensation tube banks are located in one body. Evaporating tube banks of heat-exchangers are connected sequentially to each other by coal slurry pipeline. Condensation tube banks of heat-exchangers are connected by coal slurry pipeline sequentially to each other. Outlet fitting of the last condensation tube banks is connected by coal slurry pipeline to inlet fitting of high-temperature shell-and-tube heater, outlet fitting of which is connected to coal slurry pipeline with inlet fitting of evaporating heat-exchanger tube bank. Facility (the second version) is outfitted by spaced by height shell-and-tube heat-exchangers with condensation tube banks for heating of initial pulp and shell-and-tube heat-exchangers with evaporating tube banks for cooling of leached pulp, arranged in pairs: the first in the same direction as pulp heat-exchanger with evaporating tube bank is connected to the last heat-exchanger with condensation tube bank, the second heat-exchanger with evaporating tube bank is connected to the last heat-exchanger with condensation tube bank, and all of following heat-exchangers are connected respectively. Inventions provide decreasing of costs, reduction of equipment overall dimensions.

EFFECT: costs decreasing, reduction of equipment overall dimensions.

5 cl, 7 dwg