Loading patent…
AssigneeVereinigte Aluminium-Werke Aktiengesellschaft
InventorLudolf Plass
Estimating the term…
A first substance and a liquid are conveyed along a conduit at least part of which is arranged in heat-exchange relationship with a second substance. Upstream of this part of the conduit, a suspension of the first substance in the liquid is formed wherein the first substance has an average particle size between 10 and 150 microns and a concentration between 1 and 6 volume percent. The suspension is conveyed along the conduit under conditions of turbulent flow. In this manner, the efficiency of the heat-exchange between the suspension and the second substance is increased. The method may be used to increase the heat-exchange efficiency in the extraction of bauxite so that an apparatus of given size can extract greater quantities of bauxite or, conversely, so that a given quantity of bauxite can be extracted with an apparatus of smaller size.
A process for the continuous extraction of bauxite with soda lye, comprising the steps of forming a suspension of particulate bauxite in soda lye wherein the concentration of bauxite is between substantially 1 and 6 volume %, said buaxite having an average particle size between substantially 10 and 150 microns;
In a process for the continuous extraction of bauxite with caustic liquor such as soda lye wherein the bauxite and liquor are conveyed along a confining path under pressure and heated to a final temperature by heat-exchange with a heated substance, the improvement comprising the step of forming a suspension of said bauxite in said liquor wherein said bauxite has an average particle size between substantially 10 and 150 microns, whereby the efficiency of said heat-exchange is improved.
Dependencies are inferred from the claim text.