92results about How to "High metal recovery rate" patented technology

The invention provides a method for green recovery of waste circuit boards by a cyanide-free full-wet whole set process, and belongs to the field of recycle economy. The method comprises the following steps of: mechanically crushing waste circuit boards; separating by adopting gravitational segregation to obtain impure copper powder and non-metallic powder; smelting and casting the impure copper powder to obtain a copper anode plate; and performing copper electrolytic refining on the copper anode plate; separating copper, gold, solver, platinum-palladium, lead and tin in the copper anode mud so as to recover the valuable metals of copper, gold, solver, platinum-palladium, lead and tin therein and performing wastewater recycling. The overall recovery rate of metals in the waste circuit boards reaches over 98 percent, the cathode copper obtained by the copper electrolytic refining reaches 4N level, the copper removal rate in the copper anode mud reaches over 96 percent, the recovery rate of the gold reaches over 98 percent, the recovery of the platinum-palladium reaches over 96 percent, the recovery rate of the silver and lead reaches over 95 percent, and the recovery rate of the tin reaches over 90 percent. The method for the green recovery of the waste circuit boards has the characteristics of cyanide-free full-wet property, wastewater recycling, and no secondary pollution.

The invention discloses a method for recycling iron in multilevel magnetic separation mode from a zinc hydrometallurgy process. Reduction roasting products of high iron and zinc calcine are chosen as raw materials, raw material slurry once ball milled is treated by primary magnetic separation through a magnetic field of moderate strength, and then obtained concentrate is secondary ball milled and dispersed to perform fine separation through a weak magnetic field to achieve iron enrichment ore concentrate. Primarily-separated and finely-separated tailings are magnetically separated through a strong magnetic field to obtain zinc enrichment tailings, and concentrate magnetically separated by the strong magnetic field returns to the steps of secondary ball milling, dispersing and weak magnetic separation to be separated again. The method can adjust strength of different magnetic fields according to different magnetic separation processes, reduces magnetic mixing and non-magnetic mixing in a fine separation process and greatly improves selectivity. Simultaneously, processes of ball milling and dispersing are added, thereby avoiding magnetic flocculation in a traditional single-level magnetic separation process and improving separation efficiency. The problems that a traditional zinc hydrometallurgy process is difficult in iron and zinc separation, large in environmental pollution, seriously waste in zinc and iron elements and the like are effectively resolved.

The invention relates to application of methylne bis (bitutyl dithio carbamate) in flotation of copper-molybdenum ore and is characterized in that a use method is as follows: smashing and levigating sulfide ore containing copper and/or molybdenum; adding water until the solid content in ore slurry reaches 30-35%; adding 300-500 g/ton raw ore of activating agent sodium sulfide, 1000-1800g/ton raw ore of inhibitor sodium silicate and 10-20g/ton raw ore of collector methylne bis (bitutyl dithio carbamate); and carrying out primary roughing, three times of scavenging and three times of selections, and obtaining copper concentrate. Compared with the existing collector, the collector methylne bis (bitutyl dithio carbamate) provided by the invention does not block a pipeline, is convenient for operation, is used for achieving the flotation of copper-molybdenum sulfide ore in an alkaline medium, and is strong in adaptability; use amount of the collector is less, and production cost is low, so the collector methylne bis (bitutyl dithio carbamate) is beneficial to popularization and application in a dressing plant; and the metal recovery rate of the copper-molybdenum sulfide ore in the process of copper-molybdenum sulfide ore flotation is improved by using the collector in the invention.

The invention discloses a treatment method for waste circuit board pyrolysis recovery. The method comprises the following steps that waste circuit boards are subjected to crushing, electrostatic separation and pyrolysis treatment to obtain flue gas and carbon-containing multi-metal materials, the carbon-containing multi-metal materials are subjected to electrostatic separation to obtain carbon powder and multi-metal materials, and the flue gas is subjected to secondary combustion, selective catalytic reduction treatment, quenching treatment, adsorption treatment and dust removal treatment to obtain the flue gas superior to the emission standard. By means of the treatment method, metal and non-metal substances in the waste circuit boards can be effectively separated, industrial continuous treatment of the waste circuit boards and recycling of resources are achieved, and the metal recovery rate reaches nearly 99.9%; besides, dioxin can be effectively prevented from being generated, and the dioxin removal efficiency is higher than 99.9%.

The invention relates to a method for producing electrolysis nickel from nickel-cobalt concentrate of laterite, and relates to a production method of electrolysis nickel, particularly a method for producing the electrolysis nickel by utilizing the laterite. The method is characterized by comprising the following steps of: carrying out drying and dehydration on the nickel-cobalt concentrate of the laterite, adding coke and quartz, mixing materials, producing pellet material, pre-treating at the temperature of 300 to 1000 DEG C, carrying out high-temperature treatment at the temperature of 1000 to 1600 DEG C, separating slag phase, producing electrolysis anode and producing the electrolysis nickel by electrolysis. The method utilizes the nickel-cobalt concentrate produced in the smelting processing of nickel laterite and adopts the technique of drying, pretreatment, high-temperature decomposition and electrolysis to produce the electrolysis nickel, and has the advantages of high metal recovery rate and simple process; simultaneously the process is also applicable to processing nickel-cobalt sulphide and nickel-cobalt waste; and the method has the characteristics of wider material applicability, little investment, low production cost, high nickel-cobalt recovery rate, little environmental pollution and the like.

The invention discloses a step recycling method for metallic aluminum in aluminum ash. The step recycling method includes steps of 1), sieving the aluminum ash to obtain oversize aluminum ash and undersize aluminum ash; 2), smashing the oversize aluminum ash obtained at the step 1), and then sieving the oversize aluminum ash to obtain metallic aluminum particles and undersize aluminum ash; 3), carrying out wet ball-milling on the undersize aluminum ash obtained at the steps 1) and 2) to obtain ball-milled slurry; 4), carrying out wet classification on the ball-milled slurry to obtain large-particle metallic aluminum sheets and fine-particle slurry; 5), sorting the fine-particle slurry to obtain fine-particle metallic aluminum powder and tailings; 6), dehydrating the tailings to obtain filter liquor and filter residues; 7), carrying out circulation enrichment the filter liquor and then evaporating the filter liquor to recycle industrial salt; 8), mounting ammonia gas collecting and absorbing devices above all materials exposed in the air in aluminum ash treatment procedures. The step recycling method has the advantages that step recycling is carried out on the metallic aluminum, accordingly, the metal recycling rate can be greatly increased, the purity of products can be greatly improved, and a novel way can be developed for harmlessly utilizing the aluminum ash as a resource.

The invention relates to the technical field of metallurgy and mineral engineering and discloses a mineral separation method for pre-extraction of concentrates from roasted iron ore. According to the method, roasted ore which is uniform in size distribution and formed after magnetizing roasting of refractory low-grade iron ore with the insetting grain size of 15-120 mu m is taken as a raw material; the method comprises process steps of primary ore grinding of the roasted ore, magnetic separation of primary ore ground materials, primary ore concentrate pre-extraction of rough concentrate with a large grain size, three stages of magnetic separation of materials with fine grain sizes, secondary ore concentrate pre-extraction of rough ore concentrate with medium grain sizes and the like. The method of fractionated ore grinding and fractionated magnetic separation is adopted due to the fact that different insetting grain sizes of the roasted ore correspond to different ore grinding sizes; iron ore concentrate is extracted in a fractionated manner according to difference of grain sizes, the over-grinding phenomenon of coarse-grain iron ore is effectively prevented, the separation efficiency and the metal recovery efficiency are improved, the over-grinding phenomenon of the iron ore with larger grain sizes in the roasted ore is effectively prevented, the production cost is reduced, and the ore separation efficiency is improved.

The invention relates to the technical fields of metallurgy and mineral engineering and discloses a refractory low-grade iron ore shaft furnace coal-based magnetizing roast process. The process disclosed by the invention comprises the following steps: dosing iron ore with the granularity of 15-50mm and semi-coke with the granularity of 15-30mm according to a ratio of 100:(2-5), uniformly mixing, and adding the mixture from the top of the shaft furnace; and allowing the mixed material flow to pass through a preheating zone of the shaft furnace and enter a heating zone, allowing one part of the semi-coke to participate in combustion in the shaft furnace, and allowing the mixed materials comprising the iron ore of which the temperature rises to 900-950 DEG C and the residual semi-coke to enter a reducing zone. At the reducing zone of the shaft furnace, reducing gas is introduced from the bottom of the furnace chamber, H2 and CO in the gas participate in iron ore reduction so as to generate water vapor and CO2, the water vapor and CO2 are contacted with the semi-coke to carry out a carbon gasification reaction in the iron ore in the rising process in the furnace chamber so as to produce H2 and CO, the reducing medium concentration in the shaft furnace is improved, and the amount of the reducing gas is reduced, so that the iron ore is fully reduced. After the iron ore is completely roasted at the reducing zone of the shaft furnace, fine iron ore concentrate with the iron grade of 56-60 percent is obtained by virtue of oxygen-free cooling, ore grinding and magnetic separation.

The invention relates to a duplex rocking furnace method used to produce carbon ferromanganese. It includes the following steps: leading manganese slag thermal fluid to start rocking furnace; adding 1/2 liquid state manganese-silicon by weight; swing; leading the formed start rocking slag into final rocking furnace; adding the rest 1/2 liquid stage manganese-silicon; rocking; the fining procedure is as follows: adding rich manganese ore with not less than 40% manganese content; charging quantity is the 3/4 of the proportioning by weight; adding liquid state middle alloy into fining furnace; adding the rest 1/4 rich manganese ore; their ratio by weight is 1.1-0.85:1. The invention adopts four furnaces linkage to increase manganese recovery rate. Compared with fining carbon ferromanganese by single rocking furnace method, it can reduce 2-4 percent of final slag manganese containing, and reach under 7% to further increase manganese recovery rate.

The invention discloses a tailings recovery technology. The tailings recovery technology includes feeding ore pulp into a concentrating cylinder of a concentrating machine; driving the concentrating cylinder to rotate around own central axis to enable the ore pulp to stir and tumble in an inner chamber of the concentrating cylinder incessantly while the ore pulp flows; applying a magnetic field on the ore pulp by a magnetic field generator, and subjecting the ore pulp to precise separation by a separator to enable separated ores in the ore pulp to be attached to the inner wall of the concentrating cylinder to move upwards during ascent and descent under the action of the magnetic field so as to arrive at an ore discharging area; in the discharging area, enabling the separated ores to fall into a receiving groove of the concentrating machine and enabling other substances, except for the separated ores, in the ore pulp to enter a tailings trough of the concentrating machine from the bottom of the inner chamber of the concentrating cylinder and then enter a tailings conveying system.

The invention discloses a method for recycling cobalt nickel from tungsten waste recycling slag. The method comprises the steps that firstly, the tungsten waste recycling slag and water mixed to be subjected to size mixing, and a sizing mixture is conveniently obtained; secondly, the sizing mixture is mixed with acid liquor and a reducing agent to be subjected to a reduction reaction, and liquor after reduction is conveniently obtained; and thirdly, the reduced liquor is subjected to solid and liquid separation treatment, and a solution containing cobalt nickel is conveniently obtained. The method is adopted to effectively recycle metal elements like metal cobalt nickel in the tungsten waste recycling slag, the process is simple, and the metal recycling rate is high.

A method for recovering one or more of copper, uranium and a precious metal from an ore material, including: (a) forming a heap of the ore material; (b) during active heap irrigation, contacting the heap of the ore material with an iron containing acidic leach liquor having a high chloride content in the presence of an oxygen containing gas, and producing a pregnant leach solution; and (c) recovering one or more of copper, uranium and a precious metal from the pregnant leach solution.

The present invention is related to a bioleaching bioreactor having an air injection and diffusion system, which allows to control the air bubble fine size, improving the oxygen and carbon dioxide distribution required by the microorganisms promoting the bioleaching process, in order to maintain the cellular concentration during the process. The bioleaching bioreactor comprises a reactor body to contain the pulp to be processed and to allow the reaction to proceed; a support base to secure the reactor body; a pulp feeding device, protruding inwards the reactor body; an air injection and diffusion system to mix and to supply the air required by the reaction process; at least four vortex breaking elements located inside the reactor body; at least a heating element surrounding the reactor body to maintain the reaction temperature; a pulp outlet port to deliver the pulp already processed; an inlet port for the pulp to be processed; an air inlet port, located at the upper end of the reactor body; and, a vapor outlet port, located at the upper end of the reactor body.

The invention discloses a method and system for removing sulfur dioxide in flue gas by coupling zinc-ammonia complexing with persulfate advanced oxidation technology. The method comprises the following steps of firstly, uniformly mixing zinc-containing waste with ammonia water and an ammonium persulfate solution, carrying out solid-liquid separation to obtain a zinc-ammonia complexing solution, then introducing the zinc-ammonia complexing solution into an electrolysis device to remove impurities and prepare a mixed solution containing ammonium persulfate, spraying the mixed solution into a flue gas desulfurization tower, activating the ammonium persulfate in waste heat provided by flue gas to generate SO4.-with a strong oxidizing property, and absorbing SO2 in the flue gas by the zinc-ammonia complexing solution under oxidation strengthening to achieve the purpose of efficient desulfurization of the flue gas; and introducing desulfurization slurry into an electrolytic cell again, carrying out cyclic electrolysis for multiple times to obtain pure nano-zinc, recycling an ammonium sulfate and ammonium persulfate mixed solution generated by electrolysis, and participating in the zinc-ammonia complexing reaction again. The method has the advantages of coupling of flue gas desulfurization and secondary zinc resource recovery processes, high flue gas desulfurization efficiency, high recovery rate of metal in waste, multi-path cyclic utilization of ammonium sulfate and the like.

The invention discloses a stainless steel intelligent smelting system, which comprises a stainless steel argon-oxygen decarburization (AOD) smelting furnace and an intelligent smelting system connected with the stainless steel AOD smelting furnace, wherein the intelligent smelting system consists of a gas control system, an AOD operating workstation and an AOD automation system; the AOD operating workstation consists of a human machine interface (HMI) system, a personal computer (PC) server and a programmable logic controller (PLC) module; and the AOD automation system consists of a database and an intelligent smelting model. The stainless steel intelligent smelting system is provided with the human machine interface for a user, and operation is convenient and intuitive; and the database calculates and displays chemical compositions in molten steel and the temperature of the molten steel in the furnace by a picture in real time according to the consumption of the gas. The stainless steel intelligent smelting system is suitable for small, medium as well as large steel mills and solves the problem of the complicated steelmaking process for the user because the operation is convenient; and because of reasonable price, the smelting cost can be greatly reduced for the user, and the stainless steel intelligent smelting system is easy to promote.

The invention provides a method for preparing bismuth electrolyte with bismuth oxide slag. The method is characterized by comprising the following steps: leaching fine-grained bismuth oxide slag in a fluosilicic acid system, and filtering; returning leaching slag back into a silver revolving furnace for blowing; adding lead powder into leach liquor to replace copper in a solution; adding sulfuric acid into the copper-removed solution to recover lead; precipitating lead in sulfuric acid for purifying to obtain a solution which is qualified bismuth electrolyte. By leaching through the fluosilicic acid system, separation of bismuth-lead-copper and silver is realized, piling of precious metals is reduced, and the metal leaching rate is high.

This invention relates to a hydrometallurgical process for extracting platinum group metals (PGMs), gold, silver and base metals from a flotation concentrate (10) containing sulphide minerals such as pentlandite and chalcopyrite, along with pyrite and pyrrhotite. The process includes a modified pressure oxidation step (12) to selectively separate base metals into sulphate medium (14), from the PGMs. The modified pressure oxidation step (12) partially or completely oxidizes sulphide minerals to produce a N product slurry (14) containing base metal sulphates in solution and a solid residue containing PGMs along with sulphate and elemental sulphur. The solid residue is subjected to a thermal treatment (18) to remove sulphate and elemental sulphur from the solid residue, and to condition the PGMs to be soluble in chloride medium. The treated solid residue is the subjected to PGM recovery by leaching in chloride leaching medium (20) to recover the PGMs.

The invention relates to a technology and a system for producing an iron ore concentrate by an iron ore chain grate machine-rotary kiln through shallow hydrogen metallurgy. Iron ore of which the granularity is 40 mm or below is divided into three granular classes, wherein coarse-grain iron ore is dried and preheated through the chain grate machine to be added from the material adding end of the rotary kiln, high-volatility lignite is evenly sprayed and blown to be distributed in the length direction of the whole rotary kiln, middle-grain iron ore is sprayed and blown to the front section and the middle section of the shallow hydrogen metallurgy roasting area of the rotary kiln, and fine-grain iron ore is added into the rear section of the shallow hydrogen metallurgy roasting area and is processed through a shallow hydrogen metallurgy process to obtain iron ore concentrate. The chain grate machine is connected in front of a magnetization roasting rotary kiln in series, an early stage oxidizing roasting method and a later-stage reduction roasting method are adopted to further improve hydrogen utilization efficiency, roasting time is shortened, and the roasting quantity of the iron ore, the yield of the iron ore concentrate and a metal recovery rate can be greatly improved.

The invention relates to recovery of a lithium foil and particularly relates to a method for recovering a waste battery lithium foil. The method for recovering the waste battery lithium foil comprises the following steps: (1) performing extrusion forming; (2) performing coarse filtration; (3) performing fine filtration; (4) casting; (5) performing segregation melting; and (6) cutting. The metal lithium product recovered by the invention is high in product purity and is stable and further the metal recovery rate is high. The filtering and melting process is performed under a high vacuum condition, the casting and segregation melting process are performed under an argon protection condition, and the oxygen content and nitrogen content in the metal lithium product can be stably controlled. The recovery method is safe and reasonable. The recovery method is processed in a fully closed device, the filtering and melting process and the segregation melting process are continuously finished at a step and the production efficiency is high.

The invention discloses a resource recovery processing method of a waste circuit board. The resource recovery processing method comprises the following steps of crushing the waste circuit board into particles, mixing the particles with an additive, and carrying out anaerobic pyrolysis treatment to obtain pyrolysis gas and a pyrolysis solid product; screening the pyrolysis solid product to obtain calcium bromide, calcium carbonate, calcium oxide, carbon powder, glass cloth, copper foil and the like; adding water into the calcium bromide, the calcium carbonate, the calcium oxide and the carbon powder, dissolving and filtering the mixture to obtain a calcium bromide aqueous solution and calcium carbonate-calcium hydroxide-carbon powder; evaporating the calcium bromide aqueous solution to obtain a calcium bromide product; drying and screening the calcium carbonate-calcium hydroxide-carbon powder to obtain a carbon powder product and the calcium carbonate and the calcium hydroxide; inorganic bromine in pyrolysis gas generated by catalytic cracking of the thermal gas is absorbed by calcium oxide, then dissolved, filtered, evaporated and concentrated, bromine in the pyrolysis gas is recycled, the pyrolysis gas is combusted after absorption by calcium oxide, and smoke generated by combustion and fusion casting is treated to reach the standard and then discharged. According to the method, the waste circuit board can be recycled, dioxin is prevented from being generated, the recovery rate is high, and industrial application is facilitated.