New Patents III

which the ore is digested with aqueous hydro- chloric acid and the silica solids removed to ob- tain an aqueous acidic digest solution of metal chlorides consisting of cesium chloride together with other metal chlorides, by (a) evaporating water from the digest solution to obtain a solid mixture of metal chlorides, including cesium chloride and hydrated aluminum chloride; (b) heating solid phase mixture at a temperature ef- fective for converting the hydrated aluminum chloride to aluminum oxide without decom- posing the cesium chloride; (c) extracting the resulting solids with water to obtain an aqueous extract of cesium chloride; and (d) separating the residual solids containing the aluminum oxide to produce a purified extract of cesium chloride.

4940487

P R O C E S S F O R U T I L I Z I N G O F Z I N C - C O N T A I N I N G

M E T A L L U R G I C A L D U S T S A N D S L U D G E S

Walter Lugscheider, Luzian Pochmarski, Graz, Austria assigned to Voest-Alpine Stahl Donawitz GeseUschaft m b H

In a process for utiliting zinc-containing meta- llurgical dusts and sludges, the zinc-containing dusts and sludges are agglomerated, briquetted in a cold manner or pelletized and are added to the charge of a melting furnace for melting metal from metallized charges such as, scrap iron or pig iron. For this purpose, there are in particular used agglomerates or pellets having a metallizing degree of at least 30 percent by weight, pre- ferably of at least 40 percent by weight.

4940488

M E T H O D O F S M E L T I N G R E D U C T I O N O F O R E S

C O N T A I N I N G M E T A L O X I D E S

Takuya Maeda, Keikichi Murakami, Tsutomu Yamada, Mitsuharu K.ishimoto, Kenichi Yajima, Kobe, Japan assigned to Kawasaki Jukogyo Kabushiki Kaisha

Metal oxide ore is subjected to smelting reduc- tion to obtain the molten metal by a method which comprises prereducing said ore in solid

state in a prereduction furnace, thereafter mel- ting said ore and carrying out final reduction thereof in a smelting reduction furnace, and at the same time introducing gas generated in said smelting reduction furnace and having reductive capability into said prereduction furnace, the rate of prereducing said ore in said prereduction furnace being controlled at a value with a maxi- mum of the order of 33 percent for raising the rate of utilization of energy to a maximum limit.

4940534

F R O T H F L O T A T I O N C O L U M N

John M M Harrison assigned to J M Huber Cor- poration

A flotation chamber separates fine kaofin par- ticles or the like by flotation out of a slurry. A generally cylindrical column has an inlet for in- jecting slurry into the column, a froth launder at an upper end of the column, and a railings outlet at the lower end of the column. A draft tube is vertically oriented within the column and has up- per and lower open ends. A sparger within the draft tube injects air into the slurry within the draft tube, and a rotary impeller immediately ab- ove the top end of the draft tube produces a fine bubble in the slurry and permits quiescent zones in the slurry above and below the position of the impeller. Aeration of the slurry suppfied to the impeller lowers power draw.

4941917

P R O C E S S F O R R E C O V E R Y O F P R E C I O U S M E T A L S F R O M

C A R B O N A C E O U S O R E S U S I N G C H L O R I N E D I O X I D E

Lawrence M Cenegy, Samuel Deal, Max Cooley, Paul Clark assigned to Exxon Chemical Patents Inc; Barrick (USA) I

Carbonaceous ore containing a precious metal (gold) is treated with an aqueous solution of chlorine dioxide to enhance the recovery of the precious metal.