675results about "Recovering materials" patented technology

A method of regenerating a phase-change sputtering target for optical storage media. First, a used powder-metallurgy sputtering target composed of a target material, an adhesion material, and a backing plate is recycled. Then, the target material is separated from the backing plate. Then, the target adhesion material is scraped from the recycled target material Thereafter, the surface of the recycled target material is processed. Finally, the backing plate, a new adhesion material, the recycled target material, and new powders are placed in a vacuum thermal-pressure furnace in sequence to perform a thermal-pressure sintering process. This completes a new phase-change sputtering target

The invention discloses a composite slagging agent for making semisteel, and a preparation method and a using method thereof. The slagging agent comprises the following components in part by weight: 26 to 36 parts of iron-containing oxide, 27 to 35 parts of SiO2, 7 to 13 parts of CaO, 4 to 7 parts of MnO and 4 to 8 parts of MgO, wherein the iron-containing oxide comprises Fe2O3 and FeO in the weight ratio of (50-60):1. The preparation method comprises the following steps of: mixing vanadium-extracted tailings, quartz sand, converter steel slag magnetic ball iron and a binding agent according to a certain mass ratio and uniformly stirring; pressing into pellets; and drying to obtain the slagging agent. The slagging agent prepared by the preparation method can be used for making the semisteel together with active lime and high-magnesium lime. By the composite slagging agent prepared by the method, the defects that the slag is easy to splash and dry, has a poor dephosphorization effect, is extremely difficult to operate and the like are overcome in the semisteel making and using process.

The invention discloses a preparation method of high-purity indium, which is implemented through preparing an indium sulfate electrolyte from purified water, an analytically pure concentrated sulfuric acid, 4N metal indium, high-purity sodium chloride and analytically pure gelatin, and carrying out two-time electrolysis and then vacuum distillation on electrolytic indium under ultraclean conditions so as to obtain 5N (99.999%)-7N (99.99999%) high-purity indium. According to the invention, because a 5N (99.999%)-7N (99.99999%) high-purity indium product is finally produced by using a method for carrying out two-time electrolysis and then vacuum distillation on electrolytic indium, the advantages such as large flexibility, strong selectivity and high conversion rate of an electrolytic purification method are utilized, and after the secondary electrolysis is completed, the physical purification step of vacuum distillation is increased; and meanwhile, the pollution problem caused by reagents is avoided, and the high purity of indium products is ensured, therefore, the method is easy for industrialization.

There is disclosed an environmentally friendly method for recovering gold, silver, copper and iron from valuable metal-contained plasma-molten slag. At first, plasma is used to burn the used printed circuit boards, thus producing the slag. Then, the slag is grinded. Then, leaching, crystallization, precipitation, replacement and electric winning are conducted to recover gold, silver, copper and iron.

The present disclosure is directed towards systems and methods for the treatment of wastewater. A system in accordance with one particular embodiment may include at least one resin tank including an ion exchange resin configured to target a particular metal. The at least one resin tank may be configured to receive an output from an oxidation reactor configured to receive a flow of wastewater from a wastewater producing process. The system may further include a vacuum filter band system configured to receive a saturated resin tank and to apply a water rinse to the resin to generate a resin slurry, the vacuum filter band system including a vacuum filter band configured to receive the resin slurry. Numerous other embodiments are also within the scope of the present disclosure.

Proposed is a method for collecting valuable metal from an ITO scrap including the steps of subjecting the ITO scrap to electrolysis in pH-adjusted electrolyte, and collecting indium or tin as oxides. Additionally proposed is a method for collecting valuable metal from an ITO scrap including the steps of subjecting the ITO scrap to electrolysis in an electrolytic bath partitioned with a diaphragm or an ion-exchange membrane to precipitate hydroxide of tin, thereafter extracting anolyte temporarily, and precipitating and collecting indium contained in the anolyte as hydroxide. With the methods for collecting valuable metal from an ITO scrap described above, indium or tin may be collected as oxides by roasting the precipitate containing indium or tin. Consequently, provided is a method for efficiently collecting indium from an ITO scrap of an indium-tin oxide (ITO) sputtering target or an ITO scrap such as ITO mill ends arisen during the manufacture of such ITO sputtering target.

The present invention relates to the recovery of micro amount of noble metal and the used bacteria is lichenoid bacillus No.R08. R08 bacillus thallus solution of 0.4-2.0 g/L concentration and water solution of Pd ion of 30-300 mg/L are first mixed and vibrated at 5-60 deg.c pH 2.0-3.5 and 130 Hz vibration frequency for 3-90 min; the mixed liquid is then filtered; and filtered Pd adsorbing bacillus thallus is set at room temperature for 6-48 hr and burned at 550-800 deg.c for 1.5-3 hr to obtain metal Pd. The simple process is especially suitable for recovering Pd from low concentration solution and the Pd ion adsorbing rate may reach 99%.

Precious metal recovery by thiosulfate leaching where thiosulfate lixiviant is generated in situ employing elemental sulfur generated from partial oxidation of sulfidic precious metal-bearing feed and/or employing reactants from processing effluent.

A waste heat recovery structure includes a first exhaust gas flow path provided to each of steel making electric arc furnaces to discharge exhaust gas thereinto; a waste heat boiler disposed on the first exhaust gas flow path to recover waste heat as saturated steam from exhaust gas; a steam accumulator configured to store steam formed by confluence of saturated steam parts, each generated by the waste heat boiler; a steam super heater configured to turn steam into superheated steam by heating; a second exhaust gas flow path configured to lead exhaust gas from the waste heat boiler to the steam super heater to use it for superheating; a third exhaust gas flow path configured to discharge exhaust gas from the waste heat boiler not through the steam super heater; and a switching device configured to switch flow paths between the second and third exhaust gas flow paths.

Provided are an exhaust gas processing system and method capable of effectively utilizing the sensible heat of an exhaust gas for preheating air for burner combustion in a rotary hearth type reducing furnace while preventing troubles caused by adhesion of dust such as blockage in an exhaust gas processing facility for a rotary hearth type reducing furnace and corrosive deterioration in the facility without increasing the facility costs excessively. The system comprises a radiant heat exchanger 2 for heat exchange between an exhaust gas exhausted from the rotary hearth type reducing furnace and air. The radiant heat exchanger 2 includes an inner cylinder 22 made of metal surrounding a space through which the exhaust gas flows; an outer cylinder 21 disposed on an outer side in a radial direction of the inner cylinder to define a flow channel between the inner cylinder and the outer cylinder 21 for allowing the air to flow so as to exchange heat with the exhaust gas; and a highly thermal conductive refractory 23 applied to an inner side of the inner cylinder 22 so as to cover an inner surface thereof.

The present disclosure is directed towards systems and methods for the treatment of wastewater. A system in accordance with one particular embodiment may include a vacuum filter band system configured to receive a saturated resin tank from a front end system, the vacuum filter band system configured to generate a slurry from the saturated resin tank and to provide a cascading resin rinse to the slurry. The system may further include a repetitive stripping system configured to receive a metal-filled purification unit from a metal specific purification system. The repetitive stripping system may be further configured to sequentially apply the contents of a plurality of acid tanks to the metal-filled purification unit to generate a metal salt. Numerous other embodiments are also within the scope of the present disclosure.

The invention relates to a method for synchronously extracting vanadium and chromium by electrochemically decomposing vanadium slag in a potassium hydroxide solution. The method comprises the steps as follows: introducing oxidizing gas into mixed slurry containing the vanadium slag, potassium hydroxide and water; carrying out electrochemical oxidization reaction; and after the reaction, carrying out solid-liquid separation on the mixed slurry to obtain tailings and a vanadium and chromium alkali solution. The method is low in cost, high in extraction efficiency, pollution-free and moderate in process conditions, and can be used for efficiently and synchronously extracting vanadium and chromium; the vanadium extraction rate can reach 85-99%; and the chromium extraction rate can reach 80-95%.