New Patents V

wherein the step of preheating the fine-grained iron ore results in decomposition of at least part of the carbon monoxide contained in the used reducing gas, producing a carbon layer on the preheated fine-grained iron ore, and also pro- ducing an exhaust gas and additional heat.

4857174

METHOD OF BENEFICIATING PHOSPHATE ORES

Brij Moudgil, Dursu Ince assigned to University of Florida

4851129

PROCESS FOR THE DETOXIFICATION OF

EFFLUENTS FROM ORE PROCESSING OPERATIONS

WITH HYDROGEN PEROXIDE, USING A MAGNETIC PRE-

SEPARATION STAGE

Andrew Grifflths, Roy Norcross assigned to Degussa Aktiengesellschaft

A process for treating effluents contaiing cyanide from mining operations wherein magnetic separation is used prior to treatment with hydrogen peroxide.

4853113

FROTH FLOTATION OF BASTNAESITE

Srdja Butatovic, Peterborough, Canada assigned to Falconbridge Limited; Highwood Resources L

A process is described for the mineral separation of rare earth metal compounds, such as bast- naesite, contained in oxidic minerals. The pro- cess is a froth flotation process utilizing a novel collector emulsion, which is an emulsified mix- ture off a secondary amine modified sulphonated fatty acid, a high rosin containing tall oil fatty acid, an anionic petroleum sulphonate, and a high molecular weight primary amine. The col- lector emulsion mixture is added to the aqueous slurry of the comminuted rare earth metal com- pound containing oxidic mineral, which has been previously conditioned in a conventional manner. The conditioning reagents may include alkaline pH modifiers and gangue depressants such as citric acid, oxalic acid, sodium silicates and fatty acids. The rare earth metal compounds will be concentrated in the froth, and are separated in the conventional manner.

A method of beneficiating a phosphate ore con- taining apatite and dolomite impurities con- sisting of reagentizing a sample of the ore with an aqueous solution containing a cationic collector and sodium chloride and subjecting the ore to flotation to float the apatite fraction.

4857179

ORE FLOTATION AND MINERAL FLOTATION AGENTS FOR USE

THEREIN

Kenneth B Kimble, Gary D Macdonell, Harold W Mark assigned to Phillips Petroleum Com- pany

A process for the recovery of minerals from an ore or concentrate containing the same wherein the minerals are recovered in a froth from an aqueous pulp containing the ore or concentrate and wherein one or more mineral flotation a- gents are employed in the aqueous pulp to con- trol the type of minerals in the froth is provided. The mineral flotation agents used in carrying out the process comprise compounds formed by the addition of hydrogen sulfide to dicyclopen- tadiene. In one embodiment, the mineral flota- tion agents used in carrying out the process comprise tricyclodecenyl mercaptans having one or both of the following structures: See Patent for Chemical Structure and CH2HS.

4863512

BINDER FOR METAL- CONTAINING ORES

Bruce E Banyai, Denis E LaSota, Dennis L Strunk assigned to Aqualon Company

A binder useful for agglomerating a con- centrated ore material in the presence of water comprising an alkali metal salt ofcarboxymethyl cellulose and sodium tripolyphosphate, a pro- cess for agglomerating the concentrated ore material using this binder, and the agglomerated product of this process, are disclosed.