Abstract: Recovering gold from gold-loaded fine carbon by application of thermo-kinetic chemical activation regime at a low temperature, while preventing vitrification of imputies found in the gold-loaded fine carbon.

Abstract: The present invention relates to the recovery of base metals, in particular but not exclusively copper, via integrated hydrometallurgical and pyrometallurgical processing of base-metal sulphides, in particular but not exclusively iron-containing base-metal sulphides.

Abstract: A method for recovering catalytic metals from fluids containing catalytic metal colloids. Fluid compositions such as rinse solutions or dragout baths containing catalytic metal colloids are passed through a filter that entraps catalytic metal colloids on the filter. The catalytic metal colloids have a high affinity for the filter in contrast to other components of the fluids. The other components of the fluids pass through the filter while the catalytic colloids concentrate on the filter. The filter containing the catalytic metal colloids is burned, and the catalytic metal is retrieved. The method is economically efficient and environmentally friendly.

Abstract: A method for recovering catalytic metals from fluid compositions containing catalytic metal colloids. Fluid compositions such as aqueous rinse solutions or dragout baths containing catalytic metal colloids are passed through a porous metal filter that entraps the catalytic metal colloids. The catalytic metal colloids have a high affinity for the porous metal filter in contrast to other components of the fluids. The other components of the fluids pass through the porous metal filter while the catalytic metal colloids concentrate on the porous metal filter. The catalytic metal colloids that are captured on the porous metal filter are removed from the filter by backwashing the filter with a gas and/or a liquid. The backwashing forces the catalytic metal colloids off of the porous metal filter and through a solids discharge valve and into a solids collection container. The method is economically efficient with high catalytic metal recovery and is environmentally friendly.

Abstract: A soft magnetism metal powder having a majority of particles, each of which, when cross-sectioned, has no greater than ten crystal particles on average, may be coated on an outer surface of each of the particles with a resistive material having a higher resistivity than the underlying parent phase. The soft magnetism metal powder may be prepared by heating a soft magnetism metal powder to a high temperature in a high temperature atmosphere, thereby reducing the number of crystal particles in each of the soft magnetism metal powder particles. A soft magnetism metal formed body may be prepared by pressing the soft magnetism metal particles at a sufficient temperature and pressure.

Abstract: The present invention relates to a process for the recovery of gold and silver from the used refractory bricks of Dore furnace. This invention particularly relates to a process for the recovery of gold and silver from the used refractory bricks generated during the processing of the anode slimes of copper industry, through a non-cyanide route. The invention is useful for gold producing, gold refining and copper producing industries.

Abstract: A process is disclosed for obtaining colloid-forming metal particles from an aqueous mine waste solution containing that metal in ionic form. In accordance with this process, an aqueous mine waste solution containing that metal in ionic form is provided having a pH value of about 4.0 to about 6.5. The solution is electrified with direct current a about 1.2 to about 2.0 volts to reduce the desired metal ions to colloidal metal particles. A slurry of cellulose particles is agitatingly added to the colloid composition followed by a flocculant to form a solid phase cellulosic floc containing the colloid. The solid and liquid phases are separated, and the solid phase is dried, fluxed and heated to a temperature sufficient to melt the flux and colloid and form larger metal particles that can then be recovered. The colloid-forming metal is preferably gold.

Abstract: A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.

Abstract: A process for extracting precious metal from volcanic ore includes the steps of crushing the ore, heating the ore in a hydrogen atmosphere to soften oxide mineral encapsulating the precious metal, cooling the ore, grinding the ore, and processing the ore to extract precious metal.

Abstract: Standard cyanide-extraction techniques are coupled with carbon adsorption to facilitate the recovery of precious metals. The carbon is in the minus eighty mesh size range and is removed from a slurry by flotation. The loaded carbon is then dried and destroyed by direct fusion to produce dore bullion.

Abstract: A process is disclosed for the direct recovery of gold from cyanide leach liquor, thiourea leach liquor or Bio-D leach liquor. The process comprises reduction precipitation of the gold from solution by the addition of stabilized alkali metal borohydride, preferably sodium, potassium, lithium or ammonium borohydride, at ambient temperature and pressure. High purity gold is obtained by heating the reduced precipitate to about 1200.degree. C. The barren solution is in a condition such that it can be recycled to the upstream process.

Abstract: Process for recovering gold from a leachate containing AuBr.sub.4.sup.-- comprising contacting the leachate with a quantity of sphagnum peat moss under conditions effective to concentrate the gold on the moss, and thereafter recovering the gold from the sphagnum peat moss.