33 results about "Extractive metallurgy" patented technology

The invention relates to a method for leaching vanadium from vanadium-containing bone coal, and belongs to the technical field of metallurgical wet extraction of high-melting-point rare metals. The method adopting the two-stage oxygen pressure acid leaching process comprises the following steps: milling the bone coal; size-mixing with a sulfuric acid solution; and loading in a pressure kettle to acid-leaching in the presence of oxygen. The low-valence vanadium in a coal sample can be converted into the soluble quadrivalent vanadium, and the procedures, such as calcining, dust-collecting, leaching and the like, in the conventional process of 'calcining-leaching' can be concentrated during the procedure of pressure leaching to simplify the process and intensify the procedure, thereby greatly reducing the reaction time, directly and effectively leaching the vanadium-containing bone coal and ensuring that the leaching rate of the vanadium is as high as above 86% by adopting the two-stage oxygen pressure acid leaching process.

Aluminum alloy workpieces and/or magnesium alloy workpieces are joined in a solid state weld by use of a reactive material placed, in a suitable form, at the joining surfaces. Joining surfaces of the workpieces are pressed against the interposed reactive material and heated. The reactive material alloys or reacts with the workpiece surfaces consuming some of the surface material in forming a reaction product comprising a low melting liquid that removes oxide films and other surface impediments to a welded bond across the interface. Further pressure is applied to expel the reaction product and to join the workpiece surfaces in a solid state weld bond.

The invention relates to a method and a device for condensing magnesium vapor generated by evaporation and heat absorption of a magnesium liquid and coproducing refined magnesium and belongs to the technical field of extraction metallurgy or nonferrous magnesium metal. The method comprises the following steps: carrying out reverse phase change heat exchange on primary magnesium vapor in a first condensing section by taking evaporation and heat absorption of the magnesium liquid as a cooling manner, wherein the primary magnesium vapor is condensed to a liquid state; then evaporating the magnesium liquid to form higher-purity refined magnesium vapor due to the heat obtained by the magnesium liquid; then condensing the refined magnesium vapor to liquid refined magnesium; and continuously cooling and condensing residual vapor of the primary magnesium and refined magnesium in a second condensing section, wherein the primary magnesium and refined magnesium are condensed to solid crystal magnesium. According to the method and device provided by the invention, a magnesium liquid evaporator is used for condensing the primary magnesium vapor and further serves as a heat source for purifying the magnesium liquid. Parallel secondary cooling monomers are arranged in a secondary cooling section to realize alternate condensation and follow-up heating and re-melting. By adopting returned heating, heat demand on evaporation and remelting is realized by using heat energy of magnesium vapor condensation, so that high purity magnesium is coproduced and heat energy is fully utilized; the secondary cooling monomers are alternately condensed and remelted, so that the condensing rate is improved and the magnesium liquid is convenient to flow out and recycle.

The invention relates to a method for the comprehensive application of fly ash or slag, in particular to a method for the predesilication of the fly ash or the slag. The method mainly comprises the process flows including the baking and the activation of the fly ash or the slag, the formula process of the raw meal of activated the fly ash or the slag and a sodium hydroxide solution and the production of white carbon black. Through adopting a technological line during which the fly ash or the slag are baked and activated at first and then a sodium hydroxide solution is used to extract noncrystalline silicon oxide at a low temperature, the method ensures that the mass ratio of aluminum oxide and silicon oxide of desilicated fly ash reaches to 2.14; therefore, the method breaks a new path to take the fly ash or the slag as a raw material source for extracting metallurgical-grade aluminum oxide, thereby increasing the comprehensive utilization value of the fly ash and the slag.

Copper metal or metal alloy workpieces and/or aluminum metal or metal alloy workpieces are joined in a solid state weld by use of a reactive material placed, in a suitable form, at the joining surfaces. Joining surfaces of the workpieces are pressed against the interposed reactive material and heated. The reactive material alloys or reacts with the workpiece surfaces consuming some of the surface material in forming a liquid-containing reaction product comprising a low melting liquid that removes oxide films and other surface impediments to a welded bond across the interface. Further pressure is applied to expel the reaction product and to join the workpiece surfaces in a solid state weld bond.

Growth and characterization of low cost, and high efficiency micro- and nanostructured p-n heterojunction solar cells through eutectic solidification are provided. Eutectic solidification results in self-assembly of lamellar or rod-like domains with length scales from hundreds of nanometers to micrometers that can be used for efficient extraction of minority carriers in metallurgical-grade materials. The material having a eutectic or near-eutectic composition can be used in making a low-cost and efficient inorganic solar cell.

The invention provides a device and a method for preparing aluminum oxide by roasting crystalline aluminum chloride hexahydrate in a rotary kiln, wherein the kiln head part of the roasting rotary kiln is connected with a combustion fan and a heavy oil heater by use of pipelines; a feeding hole formed at the bottom end of the kiln head part of the roasting rotary kiln is communicated with a cooling kiln; the outlet of the cooling kiln is communicated with a belt packing machine; the kiln tail part of the roasting rotary kiln is communicated with a bottom ash outlet of a cyclone separator and a feed pipe. The crystalline aluminum chloride hexahydrate material to be roasted is fed into the roasting rotary kiln via the feed pipe from the kiln tail part of the roasting rotary kiln; the crystalline aluminum chloride hexahydrate material goes oppositely to flue gas and has drastic heat and mass transfer reaction with the flue gas, and thus is transformed into an aluminum oxide powder; the aluminum oxide powder is taken as the product and discharged into the cooling kiln. The device and the method are capable of extracting the metallurgical aluminum oxide from the crystalline aluminum chloride successfully; meanwhile, hydrochloric acid can be recovered from the flue gas generated and used for previous sections, and therefore, comprehensive utilization of coal ash is realized.

The invention discloses a handling method for metallurgy solid waste. The technological method uses metallurgy solid waste (metallurgy production environment dedusting ash, sintering dust, pelletizingdust, blast furnace dust, converter mud dust, electric furnace mud dust, steel slag and steel rolling mud solid waste and the like) as the main raw materials, and calcium-containing oxide, magnesium-containing oxide and non-coking coal are matched to perform iron bath type smelting reduction through a spraying mode to extract products like Fe, K, Na, Zn, Ti and V in the metallurgy solid waste. The dependence of pyrogenic attack of metallurgy solid waste on coke, sintering, pelletizing and agglomeration is removed really, one-step treatment of metallurgy solid waste is achieved, gradual separation is achieved, all elements are extracted, and thorough treatment is achieved. The whole method is simple and efficient, and industrial production is easy.

The invention discloses a method and device for molten salt electrolysis of materials containing antimony sulfide. The materials containing antimony sulfide and inert molten salt are mixed and put into an electrolysis device for heating electrolysis smelting, inert gas is blown in the smelting process to stir a molten pool, a liquid antimony melt layer is obtained through gradual enrichment on thelower layer in the device along with proceeding of low-temperature molten salt electrolysis, and the elementary substance sulphur is obtained in a smoke collecting device through gradual enrichment.According to the method and the device, molten salt ion mass transfer is enhanced, high-quality antimony and the elementary substance sulphur are produced by one step, and the issue that low-concentration SO2 pollutes the environment in traditional antimony pyrometallurgy is avoided. The method and the device have the advantages of being low in energy consumption, high in antimony direct yield, clean and environmentally friendly. The device is simple and practical, and good antimony and sulphur extractive metallurgy effects can be obtained when the device is used for treating antimony sulfideconcentrate in cooperation.

The invention discloses a method for separating and recycling zinc from secondary zinc resource by using a distilling-condensing device, belongs to the field of thermometallurgy, in particular relates to an extraction metallurgy technique of metal zinc, and relates to a method and a device for separating and recycling zinc from the secondary zinc resource. The method comprises the following steps of: adding a secondary zinc material in which the zinc content is greater than 30wt% into an evaporation tank, sealing the top cover, powering on a sensing heating coil to increase the temperature, increasing the temperature inside the evaporation tank to be at 900-1150 DEG C, generating a zinc liquid and evaporating, preserving the temperature of the zinc steam and introducing into a condenser, condensing and coacervating at the inner of a condensing chamber so as to form liquid zinc, opening the outlet at the lower part of the condenser to discharge the liquid zinc from the outlet, and ingoting so as to obtain zinc ingots. The method is simple in equipment and convenient in operation and has the characteristics of high recovery rate, wide material application range, good economic benefit, rapid investment return and the like.

A process for efficient separation/recovery of copper involving selective extraction of the copper ion with the aid of an organic extractant from an aqueous chloride solution containing copper and one or more concomitant elements, discharged from an extractive metallurgy of non-ferrous metals or the like, and subsequent stripping. The process of solvent extraction of copper which treats an aqueous chloride solution containing copper and one or more concomitant elements to separate/recover copper, comprising the first step for selective extraction of copper from the aqueous chloride solution by mixing the solution with an extractant of organic solvent composed of tributyl phosphate as the major component after adjusting the solution at an oxidation-reduction potential of 0 to 350 mV (based on an Ag/AgCl electrode), and the second step for stripping of copper by mixing the extractant in which copper is stripped with an aqueous solution.

The invention relates to molybdenum-tungsten-iron alloy and a preparation method thereof, and belongs to the technical field of mineral extractive metallurgy. The preparation method of molybdenum-tungsten-iron alloy comprises the following steps: adding the following raw materials such as calcium oxide, molybdenum and tungsten mixed crude concentrate, silicon iron and scrap iron into a crucible in sequence, rising the temperature to 400-600 DEG C, performing heat preservation for 3-5 min, continuously rising the temperature to 1500-1700 DEG C, performing heat preservation again for 1-3 min, and cooling, so as to obtain the molybdenum-tungsten-iron alloy. According to the preparation method of molybdenum-tungsten-iron alloy provided by the invention, molybdenum and tungsten mixed crude concentrate, calcium oxide, silicon iron and scrap iron are taken as the raw materials, the process is simple, and the required smelting time is as short as 1-3 min; compared with other methods, the preparation method has the advantages that the separation and purification processes of molybdenum and tungsten mixed crude concentrate are avoided, the smelting time is greatly reduced, the production cost is reduced, the resource utilization ratio is improved, and economic benefits are increased.

The invention relates to a high temperature chlorination shaft furnace, and belongs to chloridizing roasting shaft furnaces in the metallurgical industry. Raw materials are calcium chloride containingpellets, gold, silver, copper, lead, zinc, tin and cobalt in metallurgical and beneficiation waste residues can be extracted, and oxidation pellets can be produced. The high temperature chlorinationshaft furnace comprises a feeding device, a roasting chamber, burning chambers, a cooling discharging device and a chlorination metal gas discharging device. The burning chambers are located on one ortwo sides of the roasting chamber, and communication is achieved through a flame path. Extraction openings are located on one or two sides of the lower portion of a feeding opening, the high temperature chlorination shaft furnace is high in temperature rising capacity, sensitive in temperature controlling, even in heating, not prone to nodulation and good in product quality coincidence, and a nodule destroying device is arranged.

The invention relates to the technical field of extraction metallurgy, and discloses a method for recovering vanadium from calcified vanadium extraction tailings. The method comprises the following steps: (1) adding the calcified vanadium extraction tailings and calcium sulfite into water for pulping, then adding sulfuric acid for leaching, adjusting the pH value of a system to 2-3 by using lime and/or limestone after the leaching is finished, and then carrying out solid-liquid separation to obtain residues and a leaching solution; (2) adjusting the pH value of the leachate to 5.5-7 by using magnesium carbonate and/or manganese carbonate to precipitate vanadium, and then filtering to obtain vanadium precipitate and wastewater; (3) adding a sodium hydroxide solution and an oxidizing agent into the vanadium precipitate for reaction, performing solid-liquid separation after reaction to obtain filtrate A and filter residue A, and controlling the weight ratio of vanadium element to phosphorus element in the filtrate A to be greater than or equal to 600; and (4) calcium oxide is added into the filtrate A for vanadium precipitation, and filtrate B and filter residues B are obtained through solid-liquid separation. According to the method, the vanadium in the calcified vanadium extraction tailings can be effectively recycled, and the vanadium loss in the vanadium extraction process can be reduced.

The invention belongs to the technical field of extractive metallurgy of nonferrous metals, and specifically relates to a method for deep removal of tin in a tellurium-contained solution. The method is characterized by comprising the following steps: adding a composite silicate additive into the tellurium-contained solution, controlling a mass ratio of the composite silicate additive to tin in the tellurium-contained solution to be (0.2-2): 1, a reaction temperature to be 50 to 90 DEG C and a reaction time to be 2 to 12 hours, after deposition is completed, carrying out filtering, then subjecting obtained filtrate to acid neutralization, and carrying out filtering so as to obtain enriched tellurium. The method provided by the invention can realize deep removal of tin, and can obtain enriched tellurium with a tellurium content reaching 60% or above.