Provided is a platinum-group metal recovery method for efficiently recovering a platinum-group metal. The method for recovering a platinum-group metal includes an immobilization step of causing a molten product of a raw material containing a platinum-group metal, a molten product of a carbonate or hydroxide of an alkali metal, a molten product of an oxide, and a ceramic material to make contact with each other so as to immobilize the platinum-group metal on the ceramic material.

A method for recovering metals from waste materials includes steps of contacting a waste material feed stream with a first lixiviant adapted to leach copper and other base metals from the waste material feed stream and provide a treated waste material feed stream, recovering copper metal from the first lixiviant, contacting the treated waste material stream with a second lixiviant adapted to leach noble metals from the treated waste material feed stream and recovering gold from the second lixiviant.

A precious metal leaching method includes providing a slurried feed, comprising (i) in the solid phase, a refractory sulfide-containing material, the material comprising at least about 0.05 oz/tonne of a precious metal, at least about 0.75 wt. % sulfides, optionally at least about 0.1 wt. % feldspar (i.e., muscovite), and at least 0.3 wt. % preg-robbing carbonaceous material; and oxidizing the sulfide-containing material at more than about 240° C. and super-atmospheric pressure to oxidize at least most of the carbonaceous material and optionally convert at least most of the sulfide sulfur to sulfate sulfur and form an oxidized precious metal-containing material, wherein at least one of the following is performed during oxidizing: maintaining a pH of at least about pH 1.5; maintaining at least about 98.5% of the feldspar (i.e., muscovite) in the solid phase; maintaining a dissolved cupric ion concentration of at least about 0.25 g/L; and maintaining the slurried feed under subcritical or supercritical water operating conditions.

The invention relates to a process for recovering metals from aqueous solutions or solid feedstocks such as ores and waste. In particular, the invention relates to a method of recovering a target metal using a microorganism and recycling depleted growth media or depleted lixiviant back through the process.

The present invention relates to a method for recovering metals using an adsorbent, which comprises preparing a leachate comprising metal ions and cyanides, wherein the metal ions comprise gold ions and copper ions; and in a state where the leachate has a cyanide (CN) concentration of 0.1 ppm or greater, adding to the leachate an adsorbent, which has an open circuit potential value between the open circuit potential value of the gold ions and that of the copper ions; and selectively adsorbing the copper ions to the adsorbent.

The invention discloses Method for whole component microwave fast digestion and precious metal extraction from ionic liquid of waste circuit board, and belongs to the field of hydrometallurgy. Based on the theory that microwaves can directly penetrate through a leaching medium to directly heat a circuit board, microwave-assisted leaching can reinforce mass transfer and heat transfer in the traditional leaching process, the leaching time is greatly shortened, and the leaching efficiency is improved. Before leaching, a waste circuit board does not need to be smashed, and environmental protection is achieved while energy is saved. The temperature rising process and reaction time of the reaction can be controlled, the whole process is conducted under the airtight condition, heat loss in the leaching process is avoided, the valuable leaching rate is high, the selectivity is high, and efficient leaching of valuable metal can be achieved. Precious metal leachate is extracted through imidazolium ionic liquid, the selectivity of the imidazolium ionic liquid to gold is high, and the co-extraction phenomenon of gold, nickel, copper and other ions is avoided. The method for extracting the precious metal leachate through ionic liquid is a green and clean recycling method, and the overall recycling rate of gold, nickel and copper can reach 99% or above.

The present invention relates, on one hand, to a metal cementing apparatus (1) formed by a vessel (2) with a liquid phase formed by a solution (3) containing noble metal, and a solid phase formed by a cementing metal or a less noble metal in contact with the solution (3), where one of said phases moves at a high speed with respect to the other one, and the difference in speeds allows the cementation of the noble metal on the solid phase, and the simultaneous detachment and separation thereof, and comprises means for generating the movement of at least the phase with the high speed and removing means for removing the precipitated noble metal. The invention describes, on the other hand, a continuous cementation method consisting of passing a continuous flow of solution in a vessel (2); reacting the solid phase with the liquid phase, where one of said phases moves at a high speed with respect to the other one, causing the fixing of the noble metal and the simultaneous detachment thereof; removing the precipitated noble metal.

The disclosure provides a magnetic reagent comprised of a recombinant yeast cell having the following genetic modifications: impairment of the CCC1 gene; addition of at least one copy of a human ferritin gene complex; addition of at least one copy of a TCO89 gene; and addition of at least one copy of a mineral- or metal ion-adsorbing target peptide, wherein the magnetic susceptibility or mass magnetization of said magnetic reagent is greater than it would be for a native yeast.

The disclosure provides a magnetic reagent comprised of a recombinant yeast cell having the following genetic modifications: impairment of the CCC1 gene; addition of at least one copy of a human ferritin gene complex; addition of at least one copy of a TCO89 gene; and addition of at least one copy of a mineral- or metal ion-adsorbing target peptide, wherein the magnetic susceptibility or mass magnetization of said magnetic reagent is greater than it would be for a native yeast.

A process for roasting of metal concentrate wherein concentrate particles are fed into a roaster where they are thermally treated at a temperature in the range of 500 and 1200° C. in a fluidized bed to form a calcine. At least parts of the calcine are withdrawn from the roaster together with a gas stream as a solid fraction. Concentrate particles with a diameter at least 50% smaller than the average diameter of the concentrate particles are separated as small particles and/or particles from the gas-solid-fraction are separated in at least one step as small calcine particles and/or particles are gained in another hydrometallurgical step as other particles. Defined particles are pelletized, whereby at least 80% of the pellets feature a diameter of at least 80% of the concentrate particles average diameter. The pellets are fed into the roaster.