Abstract: Processes for purifying diketopyrrolopyrrole (DPP) copolymers are disclosed. An organic phase containing the DPP copolymer is treated with an aqueous ammonia solution and then with a palladium scavenger. The DPP copolymer is then isolated, and has a very low palladium content. The resulting DPP copolymer has high mobility.

Abstract: A method recovers noble metals from noble metal-containing compositions and includes steps of (i) providing a noble metal-containing composition containing an adsorption agent that is based on an inorganic material and is functionalized by organic groups and has at least one noble metal adsorbed to it, and (ii) ashing of the noble metal-containing composition provided in step (i) in order to adjust a residual carbon content of at most 10% by weight, relative to the total weight of the noble metal-containing composition after ashing, to obtain an ashed composition.

Abstract: The invention relates to methods of precious metals recovery from raw materials containing chlorides of earth metals, for example slimes. This method comprises the steps of cinder processing carried out in two steps. At the first step, a secondary enrichment by water washing is carried out with a ratio (S:L) ranging from 1:0.7 to 1:2.5. Then, at the second step, the washed cinder is leached by hydrochloric acid with a ratio (S:L) ranging from 1:2 to 1:3.

Abstract: A method for recovering at least one platinum group metal (PGM) species from a feed product selected from the group consisting of chromite ore, chromite ore concentrate and PGM concentrate comprising the steps of: mixing the feed with at least one salt so as to produce a mixture, whereby the concentration of salt in the mixture is sufficient to convert at least one PGM species into a corresponding PGM chloride salt; and contacting the mixture with gaseous chlorine and CO at a temperature between about 240° C. and 800° C. to induce the conversion of at least one species of PGM into a solid material containing a corresponding PGM chloride salt, whereby said chloride salt of at least one PGM species can be recovered.

Abstract: A method of separating rhodium from platinum and/or palladium includes; chloridizing a raw material including rhodium and at least platinum and/or palladium in chlorine atmosphere and obtaining a soluble salt of platinum and/or palladium; water-leaching chloridized material and dissolving platinum and/or palladium into a solution; filtering the solution; and leaving rhodium in a filtered residue of the solution.

Abstract: The present invention relates to a process for mobilizing metallic ruthenium or ruthenium compounds from solids to form volatile ruthenium compounds by means of a gas stream containing a hydrogen halide and carbon monoxide, preferably hydrogen chloride and carbon monoxide, and for isolating the previously mobilized ruthenium compounds, preferably by deposition with cooling, e.g. in relatively cold zones, in particular on relatively cold surfaces, absorption in suitable solutions or adsorption on suitable support materials.

Abstract: A method for concentrating precious metals contained in the leaching residue discharged from a copper hydrometallurgical process by removing pyrite from the residue. A method for concentrating precious metals in the leaching residue containing pyrite, elementary sulfur, precious metals and gangue, discharged from a copper hydrometallurgical process which comprises steps of leaching in an acidic, aqueous solution, reducing the copper-containing leaching liquor and electrolysis for copper recovery to treat copper sulfide ores, comprising (1) pyrolysis step in which the leaching residue is thermally treated at 550.degree. C. or higher in a non-oxidative atmosphere, to produce the calcined ore containing pyrrhotite, precious metals and gangue, and (2) a re-leaching step in which the calcined ore is re-leached in an acidic, aqueous solution, to be separated into the re-leaching residue and iron-leached liquor, the former containing elementary sulfur, precious metals and gangue.

Abstract: A method for recovering catalytic metals from compositions containing catalytic metal colloids. Compositions such as rinse solutions or dragout baths containing catalytic metal colloids are passed through a filter that entraps catalytic metal colloids from the solutions. The catalytic metal colloid has a high affinity for the filter in contrast to other components of the solutions. The other components of the solution pass through the filter concentrating the catalytic colloid on the filter. The filter containing the catalytic metal colloid is rinsed with an acid solution to remove the catalytic metal from the filter. The catalytic metal is collected in a suitable container or on an adsorbent such as a resin. The method is economically efficient and environmentally friendly.

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: The present invention relates to a process for the recovery and refining of rhodium starting from a mixture containing rhodium and other transition metals, including those of the platinum Group, as well as metals of the main Groups, said process comprising the following passages: a) formation of an adduct between rhodium trichloride and a halide of a metal selected from metals of Groups IIA, IIIA, IVA, IVB, VB and VIB; b) carbonylation of the precipitated adduct, deriving from passage a) with the formation of rhodium halogen carbonyls and c) sublimation of the carbonylated product obtained in the previous passage. The main advantage of the above process consists in the production of an extremely pure product, with excellent yields.

Abstract: A method for recovering Pt from Pt-bearing coating on a gas turbine engine component. The component is contacted with a chemical stripping agent to dissolve away constituents of the coating and produce a Pt-bearing film of acid oxidation products at the surface of the component. The film is removed from the component to produce a Pt-rich residue containing at least about 10% Pt. The Pt-rich residue is collected and refined to recover Pt therefrom.

Abstract: The present invention relates to a process for the recovery and refining of rhodium starting from a mixture containing rhodium and other transition metals, including those of the platinum Group, as well as metals of the main Groups, said process comprising the following passages: a) formation of an adduct between rhodium trichloride and a halide of a metal selected from metals of Groups IIA, IIIA, IVA, IVB, VB and VIB; b) carbonylation of the precipitated adduct, deriving from passage a) with the formation of rhodium halogen carbonyls and c) sublimation of the carbonylated product obtained in the previous passage.

Abstract: A neutralizing reagent is added to a solution of chloroplatinic acid containing impurities to adjust the pH value of the solution to 5.5-7.0, the insoluble impurity compounds that precipitated in this first neutralization step is filtrated off, a neutralizing reagent is added to the first filtrate of chloroplatinic acid to adjust the pH value of the solution to 9.5-10.5, the insoluble impurity compounds that precipitated out in the second neutralization step is filtrated off, hydrochloric acid is then added to the second filtrate in which the insoluble impurity compounds have been removed, and ammonium chloride is added to the processed solution to convert platinum compound to ammonium chloroplatinate, which is intensely heated to yield platinum sponge. The preferred neutralizing reagent is NaOH or KOH. Filtration is preferably performed with a filter of which opening size is equal or less than 0.3 .mu.m.

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 sulfur dioxide free process for the production of high purity metallic copper from copper-matte wherein copper-matte is leached under oxidizing conditions in a ferric-containing acid copper sulfate electrolyte leach assembly including one or more leach reactors to yield a copper-rich electrolyte, and copper cathode is produced in an electrowinning assembly which is physically decoupled from the leaching assembly and may include one or more electrowinning cells. The process operates at ambient pressure and temperatures less than the boiling point.

Abstract: A method for recovering rhodium comprising the steps of: adding a basic compound to an organic solution containing a rhodium complex containing at least one type of organophosphorus compound as a ligand and an organophosphorus compound, combusting the resultant mixture to ash under a controlled temperature of less than 1,000.degree. C.; and cleaning the ash using a cleaning solution containing a reducing agent.

Abstract: The invention relates to a process for recovering a precious metal, particularly palladium, from a non-aqueous effluent comprising the metal and dissolved salt and/or polyether contaminants, wherein the effluent is contacted with a reduction agent, the precious metal is deposited onto a carrier, preferably comprising a combustible carbonaceous material, and the metal loaded carrier is separated from the effluent.

Abstract: A process for recovering a Group VIII metal from an organic solution is disclosed. The organic solution is contacted with an acidic ion exchange resin that has sulfonic acid active groups. The invention provides an effective and economical way to recover valuable transition metals from dilute organic solutions.

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 mixture of cyanide complexes with certain Group VIII metals and other metals is passed in contact with solid subdivided cross-linked polyvinylpyrrolidone whereby the Group VIII metals--platinum, palladium, rhodium and iridium--are preferentially retained on the cross-linked polyvinylpyrrolidone. The retained metals are recovered by ashing or chemical treatment of the cross-linked polyvinylpyrrolidone.

Abstract: A process for recovering Platinum Group metals from material comprising one or more Platinum Group metals and one or more Group IA metals supported on carbon comprises heating at a temperature between 700.degree. C. and 1150.degree. C. in a stream of an inert gas or vacuum then in a stream of carbon dioxide.