685results about "Recovering materials" patented technology

A metal scrap submergence device having an open top chamber including side and base walls of a heat resistant material. An inlet is included in a side or base wall of the chamber for receiving molten metal. An outlet is included in the base of the chamber. A ramp extends from the side wall of the chamber to an inner column defining the outlet. The ramp includes a first edge adjacent the side wall and second interior edge adjacent the inner column. The working surface of the ramp between the first and second edges is concave. The inner column includes an end wall disposed opposite the chamber base, the end wall includes rounded inner and outer edges.

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.

A method for recovering metals from a spent dispersed catalyst originating from a Group VIB metal sulfide catalyst containing at least a Group VB and Group VIII metal for hydrocarbon oil hydroprocessing is disclosed. In one embodiment, the method comprises the steps of: contacting the spent dispersed catalyst with a leaching solution containing ammonia and air to dissolve the group VIB metal and the Group VIII metal into the leaching solution at sufficient temperature and pressure; forming a slurry containing at least a group VIB metal complex and at least a group VIII metal complex, ammonium sulfate and solid residue containing at least a Group VB metal complex and coke; separating and removing the solid residue containing ammonium metavanadate and coke from the pressure leach solution (PLS); precipitating from the PLS at least a portion of the Group VIB metal and at least a portion of the Group VIII metal by controlling the pH at a pre-selected pH to selectively precipitate as metal complexes the Group VIB and Group VIII metals.

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 invention discloses a Q345-serie super-thick steel plate having a low cost and guaranteeing performances and flaw detection, and a production technology thereof. The Q345-serie super-thick steel plate has the thickness of 100 to 200mm. The Q345-serie super-thick steel plate comprises 0.08 to 0.17wt% of C, 0.15 to 0.40wt% of Si, 1.00 to 1.30wt% of Mn, less than or equal to 0.020wt% of P, less than or equal to 0.020wt% of S, less than or equal to 2.0wt% of microalloying elements comprising V, Nb, Ti, Cr and Ni, 0.020 to 0.050wt% of Als and the balance Fe and residual elements. The production technology comprises the following steps of KR molten iron pretreatment, converter smelting, LF refining, vacuum refining, continuous casting, casting blank heating, rolling, slow cooling and heat treatment. Through a reasonable chemical composition design and the LF and VD refining processes, steel cleanliness is guaranteed. Through superheating, rolling and normalizing treatment, the Q345-serie super-thick steel plate having the thickness of 100 to 200mm and guaranteeing performances and flaw detection is prepared by the continuous casting technology. The Q345-serie super-thick steel plate has yield strength of 310 to 400MPa, tensile strength of 490 to 580MPa, percentage elongation of 22 to 27% and V-notch impact energy of 80 to 200J.

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.

The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density 31.5 to 32.5° Be (sp.gr. 1.277-1.289) with high density end bittern of density 36.5 to 37.5° Be′ (sp.gr. 1.336-1.35), thereby producing low sodium carnallite, from which industrial grade potassium chloride is produced. The resultant bittern is evaporated in forced evaporation system, thereby producing crude carnallite, from which low sodium salt that would be beneficial to persons suffering from hypertension is produced. When sulphate-rich bittern is used, such bittern is desulphated with CaCl2 that is generated from carnallite decomposed liquor through reaction with lime, and wherein low B2O3-containing Mg(OH)2 is a by-product. The entire content of potassium in feed bittern is recovered in the process of the invention.

This invention relates to treated geothermal brine compositions containing reduced concentrations of iron, silica, and zinc compared to the untreated brines. Exemplary compositions contain concentration of zinc ranges from 0 to 300 mg / kg, concentration of silica ranges from 0 to 30 mg / kg, concentration of iron ranges from 0 to 300 mg / kg. Exemplary compositions also contain reduced concentrations of elements like lithium, manganese, arsenic, barium, and lead. Exemplary compositions include Salton Sea brines containing a concentration of zinc less than 10 mg / kg, a concentration of silica ranging from less than 10 mg / kg, and a concentration of iron less than 10 mg / kg.

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 a surface-modified biomass which is crosslinked with an amine group-containing cationic polymer on the surface of a cell biomass, its preparation method, and a method for recovering valuable metals using the same. The surface-modified biomass of the present invention has an advantage of improving adsorption of and affinity with anionic pollutants as a result of further introducing a cationic functional group by crosslinking of the amine group-containing cationic polymer on the surface of the biomass. In addition, the method for recovering valuable metals with the present invention is environment-friendly, economical, and harmless to the human body.

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.

There is provided a process for preparing aluminium chloride comprising: leaching aluminium dross residues with HCl so as to obtain a mixture comprising a solid and a liquid; and hydrochlorinating the liquid obtained from the mixture, so as to form a precipitate comprising aluminium chloride. Such a sequence can also be used for preparing alumina. In such a case, the process can further comprise the step of converting the so-obtained aluminium chloride into alumina. In the processes previously defined, the solid so-obtained can also be leached with H2SO4, thereby generating a leachate. The leachate can also eventually be hydrochlorinated so as to increase the yield of the desired product obtained i.e. alumina or aluminium chloride.

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 front end system including at least one resin tank having 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 radio frequency identification (RFID) system associated with the front end system, the at least one resin tank including one or more radio frequency identification (RFID) tags configured to record at least one characteristic associated with the at least one resin tank. Numerous other embodiments are also within the scope of the present disclosure.

The present invention provides a method of recovering silver safely and efficiently from a chloride or bromide bath containing various metals. Specifically, a method of recovering silver from a hydrochloric acid solution containing alkali and / or alkali earth metal chloride, silver; copper and iron ions, comprising the steps of: (1) bringing the solution into contact with a strong-base anion-exchange resin to adsorb silver; copper, and iron on the anion-exchange resin; (2) then washing the anion-exchange resin with water to remove the adsorbed copper and iron; and (3) then bringing the ion-exchange resin into contact with a hydrochloric acid solution to elute the adsorbed silver, is provided.

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.

A method of selectively leaching a metal such as nickel from an ore or ore processing intermediate comprising the metal and cobalt. The ore or ore processing intermediate is contacted with an acidic leach solution comprising an amount of an oxidising agent sufficient to oxidise a major portion of the cobalt to thereby cause it to be stabilised in the solid phase while a major portion of the metal is dissolved for subsequent recovery.

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%.

The invention relates to a high-carbon high-chromium stainless bearing steel and a preparation method thereof. The high-carbon high-chromium stainless bearing steel comprises the following components in percentage by weight: 0.9-0.95% of carbon, 0.80-0.85% of silicon, 0.3-0.35% of manganese, less than 0.025% of sulfur, less than 0.02% of phosphorus, 0.15-0.3% of molybdenum, 3.5-4.0% of chromium, 0.01-0.02% of nitrogen, 0.1-0.2% of nickel, 0.02-0.03% of niobium, 0.02-0.03% of vanadium and the balance of iron. The technical scheme provided by the invention is beneficial to deoxidation effect, enhances the cleanliness of the bearing steel, and lowers the oxygen content in the bearing steel.