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279results about How to "Efficient leaching" patented technology

Method for nickel and cobalt recovery from laterite ores by reaction with concentrated acid and water leaching

InactiveUS20060002835A1Efficiently separateEfficient leachingIron compoundsCobalt compoundsJarositeOxide
A process for leaching laterite ores containing limonite and saprolite in a two stage process. The first stage consisting of mixing and reacting the ore with concentrated mineral acid, and the second stage consisting of preparing a slurry of the acid / ore mixture in water and leaching the mixture to dissolve nickel and cobalt. Iron is efficiently separated from nickel and cobalt in the solid leach residue primarily as an oxide or hydroxide of ferric iron other than jarosite.
Owner:SKYE RESOURCES

Method for preparing aluminum oxide from coal series kaolinite rock or coal gangue

The invention relates to a method for preparing alumina by using kaolinite in coal measures or coal gangue as raw material with simple process and low energy consumption; by utilizing special influence of inner heat source (carbon) in the kaolinite in coal measures or coal gangue on calcination performance of the kaolinite in coal measures, the alumina is prepared after crashing, low temperature calcination, hydrochloric acid leaching, filtration, purification and fractional-step pyrolysis by fractional steps. The method for preparing the alumina has the advantages that the problems that calcination temperature of the prior art is high or calcination time is long as well as leaching temperature is high or leaching time is long are solved; process energy consumption is reduced; intermediate product of the purified and separated watery alumina is not required to be dried; the alumina is prepared directly by using the method of the pyrolysis by fractional steps; the process is simplified and operability is improved.
Owner:EAST CHINA UNIV OF SCI & TECH

Separating and recovering method for W and V in waste SCR denitration catalyst

The invention discloses a separating and recovering method for W and V in a waste SCR denitration catalyst, and belongs to the technical field of recovery of waste catalysts. The separating and recovering method comprises the specific steps that at first, after being smashed and dried, the SCR catalyst is uniformly mixed with Na2CO3 to obtain a mixture, the mixture is calcined at high temperature to obtain a calcined product, and the calcined product is placed in dilute sulphuric acid to leach W and V; then, W and V in the leachate are extracted with a trioctylamine-isodecanol kerosene solution, and are separated out from an extracted organic phase with NaOH as a back-extractant; next, H2SO4 is added in a back extraction solution to regulate pH, excessive NH4C1 is added to realize vanadium precipitation, and ammonium metavanadate precipitates obtained through filtering are calcined to obtain a V2O5 product; and at last, sulfuric acid is continuously added in a secondary filtrate obtained after vanadium precipitation to regulate pH, excessive CaCl2 is added to realize tungsten precipitation, CaWO4 precipitates obtained through filtering are pickled with hydrochloric acid to obtain a pickled product, and the pickled product is calcined to obtain a WO3 product. The separating and recovering method can realize efficient separation and recovery of W and V in the waste SCR catalyst, the process is simple, the pollution is less, and the separating and recovering method has a relatively high engineering application value.
Owner:ANHUI UNIVERSITY OF TECHNOLOGY

Method for recovering metallic copper in mud by using microorganism and special device

The invention relates to a method for recovering metallic copper in mud generated after production of a circuit board and / or treatment of electroplating rinse-waste water by using a microorganism and a special device. The method comprises the following steps: A, adding a culture medium into a reactor, inoculating a pre-cultured T.f bacteria and T.t bacteria inoculation liquid, starting a heating system and pre-culturing the mixture for 1+ / -0.5 day to obtain a reaction liquid; B, adding the mud into the reaction liquid obtained in the step A with stirring, starting an aeration machine to culture the mixture for 3 to 10 days, opening a valve at the bottom of the reactor, then pumping a leaching agent which contains mud granules from the reactor with stirring, filtering the mud granules with a filter press to obtain the metallic leaching agent; and C, after extracting and condensing the metallic leaching agent obtained in the step B, allowing the metallic leaching agent to enter an electrolytic bath for electrolysis to obtain copper with the purity of over 99 percent, or directly evaporating the concentrated liquor to obtain high-purity CuSO4. The method has the advantages of simple technique, low cost and environmental friendliness.
Owner:惠州市雄越保环科技有限公司

Preparation method of environment-friendly type precious metal beneficiation agent

The invention relates to a preparation method of a low-toxic environment-friendly type novel precious metal beneficiation agent. Raw materials of the low-toxic environment-friendly type novel precious metal beneficiation agent comprise a cyanate, sodium hydroxide, sodium sulfate, sodium ferrocyanide, a bromide, and a lead salt. The preparation method comprises following steps: sodium cyanate, sodium hydroxide, sodium sulfate, and sodium ferrocyanide are mixed at a certain ratio; an obtained mixture is delivered into a smelting pot which is heated to be slightly red, and is heated to 650 to 750 DEG C so as to obtain a fused material, temperature is maintained to be 750 DEG C for 30 to 50min of reaction, and then an obtained product is collected and cooled; the obtained product is smashed, the bromide and the lead salt are added for stirring, and the environment-friendly type precious metal beneficiation agent is obtained via combination. The environment-friendly type precious metal beneficiation agent can be widely used for precious metal beneficiation metallurgy of nonferrous metals ores, contains no hypertoxic compounds, is safe for human and animal, and is friendly to the environment. Compared with other metal beneficiation agents, the environment-friendly type precious metal beneficiation agent is excellent in effects, stable in performance, and low in production cost; the preparation method is simple; and environmental protection can be realized.
Owner:广西河池鑫银环保科技有限公司

Method for producing manganese sulfate by acid leaching under pressure of pyrolusite and pyrite

The invention discloses a method for producing manganese sulfate from the acid leaching of pyrolusite and pyrite under pressure, which includes the following steps: (1) after the pyrolusite and pyrite are mixed according to the proportions of 1:0.3 to 0.5 based on the mass ratio of the pyrolusite and pyrite, sulfate with the acidity of 100 to 220g / l is adopted for size mixing; (2) after the size mixing is finished, the materials are added into an autoclave, and the pressure in the autoclave is controlled from 0.3 to 1.0MPa, and the temperature is controlled from 100 to 110 DEG C for the manganese leaching reaction under pressure; after the time of reaction is for 60 to 180 minutes, the slag is discharged and the slag liquid is separated. The method can leach the manganese in the pyrolusite within a short time with different acidities under certain pressure and higher temperature and the leaching rate of the manganese is about 95 percent and the content of manganese in the slag is less than 1.5 percent.
Owner:KUNMING METALLURGY INST

Method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic

The invention relates to a method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic. Aiming at low-concentration arsenic-containing waste residue, according to the invention, a multistage alkaline leaching method is adopted, wherein mechanical stirring is performed for 10-12h in the environment of 60-80 DEG C, three-stage successive leaching is adopted, the arsenic leaching rate reaches more than 80%, the arsenic content of waste residue after treatment is less than 0.05%, which is lower than the hazardous waste identification limiting value, and therefore, the waste residue can be used as making material of building materials. As2O3 in an arsenic-containing alkaline leaching solution can be recovered by acid neutralization and sedimentation, and ferric sulfate is added to a leaching solution after filtering and sedimentation so as to produce FeAsO4.2H2O sedimentation, the comprehensive arsenic removing rate of the arsenic-containing alkaline leaching solution can reach 99%, and filter liquor can be recycled. Compared with the prior art, according to the invention, no wastewater discharge is caused in the whole process, the technology is simple, and the material is easily available, and the method can be widely popularized and applied to treatment and resource utilization of low-concentration arsenic-containing solid waste.
Owner:TONGJI UNIV

Method of separating and recovering valuable metals from waste lithium battery materials and application thereof

The invention discloses a method of separating and recovering valuable metals from waste lithium battery materials. The method comprises the following steps that a positive electrode material of a battery is leached by using sulfuric acid and a reducing agent, and filtering is carried out after the reaction is completed to obtain a leachate, wherein the reducing agent is one kind or multiple kindsof glucose, cane sugar, vitamin C, grape seeds, sodium thiosulfate and sodium sulfite; an additive is added into a leaching solution so as to adjust the pH value of the leaching solution in the rangeof 10-12, nickel, cobalt and manganese ions in the leaching liquid are enabled to be co-precipitated, and filtering is carried out to obtain a nickel-cobalt-manganese-containing precipitate and a lithium-ion solution after the reaction is finished; and the lithium-ion solution is concentrated to 20-45 g / L, excessive anhydrous sodium carbonate is added into the concentrated lithium-ion solution for reaction to obtain precipitate lithium carbonate; and the invention further discloses application of the product prepared by the method in battery production. According to the method and the application, leaching efficiency is high the process is simple, the waste liquid can be treated to prepare the terminal product lithium carbonate, and the pollution caused by the waste lithium battery to theenvironment can be effectively reduced.
Owner:武昌首义学院

Method for leaching and recycling fluorine in aluminum electrolysis cell waste cathode

The invention relates to a method for leaching and recycling fluorine in an aluminum electrolysis cell waste cathode, and belongs to the field of aluminum electrolysis solid waste source recycling. The method includes the steps: crushing and finely grinding aluminum electrolysis cell waste cathode carbon blocks, and leaching soluble fluoride in the carbon blocks by water solution; complexing filter residue after leaching by iron salt solution, and leaching insoluble fluoride in the filter residue; filtering mixture to obtain powdered carbon with low content of the fluoride; adding calcium saltor calcium-containing compound into primary filter liquor and secondary filter liquor to generate calcium fluoride, recycling fluorine sources, and returning tail liquid after filtering to corresponding working sections to be recycled. According to the method, the fluoride in the waste cathode can be efficiently separated, secondary pollution is omitted, the purity of the prepared calcium fluoride is higher than 65%, the calcium fluoride can be used for metallurgy industry, the content of carbon in the recycled carbon powder is higher than 80%, and follow-up utilization is facilitated. The method is short in process procedure, harmless treatment of the aluminum electrolysis cell waste cathode carbon blocks is achieved, and the fluorine has good industrial application prospects.
Owner:CENT SOUTH UNIV
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