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5995results about How to "Low impurity content" patented technology

Combined process for processing heavy oil

The invention discloses a group technology for heavy oil upgrading, in which the job steps include: (1) full or moiety of heavy oil individually or mixed with catalytic clarified oil entering solvent deasphalting plant, after the solvent deasphalting treatment, obtaining a deasphalted oil and a degreasing asphalt; (2) the degreasing asphalt obtained by step (1) individually or mixed with another moiety of heavy oil entering coking plant for coking treatment, in which the obtained tar heavy oil returns to solvent deasphalting plant or enters heavy oil hydrotreating plant, or moiety of tar heavy oil returns to solvent deasphalting plant and another moiety of tar heavy oil enters heavy oil hydrotreating plant, catalytic plant or hydrocracking plant; (3) the deasphalted oil obtained by step (1) individually or mixed with vacuum residual oil, non-pressure residual oil, pressure-relief residual oil, catalytic cycle stock and one or more than one heavy oil of tar heavy oil obtained by step (2) entering heavy oil hydrotreating plant for hydrotreatment, after hydrotreatment, obtaining fractions of benzin naphtha, plane kerosene and diesel and hydrogenating heavy oil. The invention can improve the charge-in nature, alleviate the operating condition and prolong the cycle length of the heavy oil hydrotreating plant, which provides better raw oil for downstream plants including catalytic plant.
Owner:LUOYANG PETROCHEMICAL ENG CORP SINOPEC

Method for recovering waste/used lithium iron phosphate positive-pole material by acid leaching method

The invention belongs to the technical field of recovery of lithium-ion batteries and particularly relates to a method for recovering a waste/used lithium iron phosphate positive-pole material by an acid leaching method. The method provided by the invention comprises the following steps: (a) carrying out acid leaching: adding acid into the lithium iron phosphate positive-pole material for acid leaching so as to obtain a suspension, and carrying out filtration, so as to obtain filtrate; (b) carrying out oxidation: adjusting the pH value of the filtrate obtained in the step (a) to be smaller than 1, and adding an oxidant into the filtrate to oxidate ferrous ions in the filtrate into ferric ions, so as to obtain a mixed solution; (c) carrying out separation: adjusting the pH value of the mixed solution obtained in the step (b) to be 1.5 to 4, carrying out a reaction for 1 to 3 hours at the temperature of 60 DEG C to 95 DEG C so as to produce ferric phosphate precipitates, and carrying out filtrating and washing, thereby obtaining lithium-containing filtrate and ferric phosphate. The method provided by the invention is simple in process, continuous in cycle, low in cost and easy to industrialize and is environmentally friendly; the recovery rate of Li, Fe and P reaches 95% or more, subsequent prepared FePO4 is low in impurity content, the particle size is 1 to 6 microns, is uniform and is narrow in distribution, and the morphology is controllable, so that the FePO4 is battery-grade ferric phosphate.
Owner:TIANQI LITHIUM CORP

Manufacturing method of micro spherical titanium and titanium alloy powder

ActiveCN104475743AFast purification smeltingControlled purification smeltingSpherical shapedTitanium alloy
The invention relates to a manufacturing method of micro spherical titanium and titanium alloy powder, and belongs to the technical field of metal and alloy powder manufacturing. The manufacturing method comprises the steps that a titanium and titanium alloy wire or bar is manufactured by using sponge titanium in the national standard TA1 grade as a raw material; forvacuum treatment is conducted on a powder manufacturing device, and then the powder manufacturing device is filled with inert protective gas; the raw material wire or bar is fed into a smelting chamber through a continuous feeding mechanism and a straightener, the raw material is heated and smelted through a high-frequency induction coil, and the alloy raw material is molten to form stable liquid flow or drip flow; supersonic atomizing nozzles in atomizers are opened, and breakage, dispersion and forced cooling powder manufacturing are conducted on the molten liquid flow or the drip flow; powder is obtained through a powder collector, and is screened through an ultrasonic vibrating screen to obtain the micro spherical titanium and titanium alloy powder. The micro spherical titanium and titanium alloy powder manufactured through the manufacturing method is small in particle size, high in degree of sphericity, good in liquidity and low in impurity content, and has smooth surfaces.
Owner:有研增材技术有限公司

Production method for electrolytic manganese dioxide

The invention relates to a production method for electrolytic manganese dioxide. The method comprises the following steps of: A. preparing a mixed liquid of crude manganese sulfate and slurry; B. neutralizing the mixed liquid to remove iron; C. carrying out three-time deep purification on the crude manganese sulfate solution including first purification to remove heavy metals, second purification to remove trace element molybdenum and third purification to remove calcium sulfate and magnesium sulfate; D. electrolyzing; E. rinsing including six steps of washing acid with hot water, rinsing with a weak base, rinsing with a strong base, washing base with hot water, backwashing with a diluted acid and rinsing with hot water; F. milling; and G. mixing to obtain an electrolytic manganese dioxide product. According to the invention, low-grade manganese oxide ore is used as a main raw material to prepare a manganese sulfate solution, the manganese sulfate solution is subjected to deep purification treatment to obtain a high-purity electrolyte, high-performance electrolytic manganese dioxide special for mercury-free alkaline cells and automobile power cells can be respectively produced under different electrolysis conditions, and the obtained electrolytic manganese dioxide product has low impurity content and high quality.
Owner:GUANGXI GUILIU CHEM CO LTD +1

Method for preparing titanium solution by wet-processing on vanadium-titanium magnetite concentrates

The invention belongs to the wet-process metallurgical filed and in particular relates to a method for preparing titanium solution by wet-processing on vanadium-titanium magnetite concentrates. The method for preparing titanium solution by wet-processing on vanadium-titanium magnetite concentrates comprises the following steps of: (1), mixing the vanadium-titanium magnetite concentrate with hydrochloric acid, and leaching to obtain an intermediate sizing agent; (2), filtering the intermediate sizing agent to obtain leaching liquor and leaching residues; (3), carrying out water-washing on the leaching slag to obtain washing water and washing slag; (4), carrying out fused-salt reaction on the washing slag to obtain fused-salt reaction materials; (5), carrying out water-washing and filtering on the fused-salt reaction materials to obtain water-washing materials; (6), carrying out acid pickling on the water-washing materials to obtain sizing agent, and filtering to obtain the acid-pickled sizing agent; (7), carrying out acid dissolving on the acid-pickled materials by using a sulfuric acid solution to obtain acid-dissolved materials; and (8), adding the acid-dissolved materials to the sulfuric acid solution for extracting, and filtering to obtain extracting solution which is the titanium solution. According to the method for preparing titanium solution by wet-processing on vanadium-titanium magnetite concentrates disclosed by the invention, the titanium in the iron concentrate is sufficiently utilized, so that the titanium resource utilization rate is high and the recovery rate of the titanium in the titanium concrete is higher than 90%.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Method for preparing ternary positive electrode material through recovering waste ternary lithium battery

The invention provides a method for preparing a ternary positive electrode material through recovering a waste ternary lithium battery. The method comprises the following steps of 1) mixing pretreatednickel cobalt lithium manganate waste positive electrode powder with sulfate, and roasting to obtain a roasted product; 2) immersing the roasted product in water to obtain water immersion liquid andwater immersion slag; wherein the water immersion liquid contains lithium salt; 3) reacting the water immersion slag with an acid solution and hydrogen peroxide to obtain a nickel-cobalt-manganese leaching solution; 4) removing impurities from the nickel-cobalt-manganese leaching solution, then extracting cobalt, manganese and nickel, and saponifying and reversely extracting obtained organic phaseto obtain a nickel sulfate solution, a cobalt sulfate solution and a manganese sulfate solution; and 5) co-precipitating the nickel sulfate solution, the cobalt sulfate solution and the manganese sulfate solution with a sodium hydroxide solution and ammonia water, mixing obtained precursor with lithium carbonate, sintering, and screening iron to obtain the ternary positive electrode material. According to the method, lithium is extracted firstly, so that the influence of a lithium element on subsequent nickel-cobalt-manganese extraction is reduced, the impurity content in the ternary positiveelectrode material is reduced, and the recovery rate of nickel-cobalt-manganese is greatly improved; and meanwhile the recovery rate of the lithium can be improved.
Owner:NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD

Process for extracting and separating rare-earth elements

The invention provides a process for extracting and separating rare-earth elements. In the process, acid organic extracting agents such as P507, P204, C272 and naphthenic acid, aqueous solution of organic acid salt of magnesium and/or calcium, and rare-earth solution are mixed for pre-extraction; rare earth ions are extracted into an organic phase; and the organic phase is clarified to form a rare earth ion loaded organic phase used for extracting and separating mixed rare earth feed liquor. A single rare-earth compound or a concentrate of several rare-earth elements is obtained through multi-stage extraction-washing-back extraction. The aqueous solution of organic acid salt of magnesium and/or calcium is prepared by roasting minerals such as magnesite, limestone, calcite and dolomite and dissolving with organic acid; the contents of impurities such as silicon, iron and aluminium are low; three-phase substances are not generated in the pre-extraction and extraction and separation processes; the purity of rare earth products is not influenced; the organic phase is not subjected to ammonia saponification, and ammonia nitrogen wastewater is not generated; the production cost of the rare earth products is greatly reduced; and a great amount of three-waste treatment cost is saved.
Owner:GRIREM ADVANCED MATERIALS CO LTD
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