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801results about How to "High recovery rate" patented technology

Method for recovering rare earth from waste rare earth luminescent material

InactiveCN102660688AHigh recovery rateProtect environmentGlass recyclingCerium oxides/hydroxidesRare-earth elementGlass matrix
The invention relates to a method for recovering rare earth from waste rare earth luminescent material, comprising the following steps: collection of waste rare earth luminescent material, including quick identification on rare earth fluorescent lamp and dismantling and breaking of the rare earth fluorescent lamp, breaking of a CRT display, and peeling and collection of the waste rare earth luminescent material and a glass matrix; pretreatment on the waste rare earth luminescent material, including demercuration oxidation precipitation, alkali fusion and acidolysis; extraction separation of rare earth elements to obtain rare earth chloride enrichment; extraction purification of the rare earth elements to obtain high-purity rare earth chloride; precipitation separation of the rare earth elements to obtain oxalate rare earth or carbonic acid rare earth precipitates; and sintering of the oxalate rare earth or carbonic acid rare earth precipitates to obtain high-purity-level rare earth oxide. The method realizes separation of rare earth elements including Ce, Eu, Tb and Y from impurity elements including Mg, Ba, Ca and the like and complete separation and recovery of light, mediate and heavy rare earth elements, and purification is carried out to obtain the high-purity rare earth oxide, so that the resources are comprehensively recycled, the process flow is reasonable, economic and practical, the rare earth recovery rate is high and the added value of the product is high.
Owner:UNIV OF SCI & TECH BEIJING

Non-pillar sublevel caving mining method for direct loading for ore

The present invention relates to a non-pillar sublevel caving method. The non-pillar sublevel caving method which loads and transports ores directly is characterized by comprising the steps as follows: two or more dipheads are tunneled downwards at the position of an orebody near a heading side along the orebody tendency and are used as main haulageways; segmented haulageways are tunneled from the dipheads to divide the orebody into segments; a stoping drift is tunneled from the segmented haulageways; the inner end of the stoping drift is tunneled a cutting roadway and a cutting winze; a vertical upward or oblique upward cutting slot medium and deep hole is drilled at the top plate of the cutting roadway, and the cutting slot is explored and formed on the cutting winze as a free surface; a mining medium and deep hole is drilled in the whole stoping drift, and the mining medium and deep hole of the stoping drift is explored on the cutting slot as the free surface to break ores; the ores are drawn under overlying rocks at the end of the stoping drift, and the ores are loaded on a tramcar directly to be transported out; when stoping, the processed of exploring the mining medium and deep hole, ore drawing and transporting out the ores are processed in the stoping drift, and the retreating mining is circulated until the stoping drift is mined completely. The non-pillar sublevel caving mehod has low cost, high ore recovery ratio, safe production and wide application range.
Owner:WUHAN UNIV OF TECH

Method for recovering lithium from lithium-containing electrode waste material

InactiveCN108220607AShort leaching timeHigh recovery rateLithium oxides/hydroxidesLithium carbonates/bicarbonatesSlagScrap
The invention provides a method for recovering lithium from a lithium-containing electrode waste material. The method comprises the following steps of (1) roasting the lithium-containing electrode waste material under a reducing atmosphere, after roasting, cooling under a protective atmosphere to obtain a reduced material, leaching the reduced material through a leaching agent, and carrying out solid-liquid separation to obtain a lithium-containing solution and solid slags; (2) preparing the lithium-containing solution in the step (1) into a lithium-containing product. According to the methodprovided by the invention, a reducing gas is adopted for reducing roasting, so that the roasting temperature is low, and the energy consumption is less; and one-step leaching is carried out after reducing, so that high-efficient separation of lithium and other metal elements can be realized, the concentration of the lithium in the leaching agent is high, the recovery rate of the lithium is greatlyimproved, the recovered lithium-containing product has high purity, and in addition, other transition metal elements in the waste electrodes can be further recovered. The method provided by the invention is short in flow, low in cost, and easy to realize industrial application.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Method for efficiently and cleanly recovering platinum group metals from spent automobile catalyst

The invention discloses a method for efficiently and cleanly recovering platinum group metals from a spent automobile catalyst, which comprises the following steps: (1) smelting and collection: mixing the spent automobile exhaust catalyst with a collector, a reducer and a slag former, and carrying out high-temperature smelting to obtain a collected metal-platinum group metal alloy; (2) alloy phase oxidation and converting: blowing oxidizing gas into the collected metal-platinum group metal alloy to perform converting; (3) high-grade platinum group metal enrichment dissolution and separation: carrying out oxidizing solvent dissolution and ion-exchange separation to obtain a platinum group metal solution, adding alkali into the exchange raffinate to neutralize and precipitate, and returning the precipitate as the collector for the smelting step; and (4) platinum group metal refinement: refining and purifying the platinum group metal solution to obtain the platinum group metal product. The method efficiently recovers the platinum group metals; the recovery rate of the platinum group metals is greater than 99%, and the platinum+palladium+rhodium content in the smelting slag is less than 10g/t; and the collector can be recycled, so that the method is clean and pollution-free and can easily implement industrialization.
Owner:KUNMING INST OF PRECIOUS METALS

Method for recycling epoxy resins and glass fibre from non-metal powder of waste printed circuit board

The invention discloses a method for recycling epoxide resin and glass fiber from non-metal powder in waste printed circuit boards, comprising the following steps of: (1) pretreatment, and dust removal by washing; (2) removing residue metal: inorganic acid is used for removing the residue metal in the non-metal powder, and the obtained powder can be used directly after being filtrated; (3) preliminary decomposition: the processed non-metal powder is added into inorganic acid, the obtained mixture is heated for reaction and then filtrated; the filtrated solid is added into organic solvent, stirred and filtrated and the obtained solid is the glass fiber; and the organic solvent in the filtrate is evaporated so as to obtain the solid epoxide resin; and (4) secondary decomposition: the obtained solid epoxide resin is added into inorganic acid, and heated for reaction; and then the organic solvent is used for extraction and then is evaporated so as to obtain low molecular weight epoxide resin. The invention realizes green recycling of the non-metal powder of the waste printed circuit boards under the moderate condition and has high recovery rate, thus not only being capable of reducing the emission of pollutants but also leading the resource to be fully utilized.
Owner:SHANGHAI SECOND POLYTECHNIC UNIVERSITY

Method for recycling high-purity fluorine and phosphorus from wastewater of phosphogypsum residue field

InactiveCN102887535AAchieve recyclingHigh recovery rateCalcium/strontium/barium fluoridesMultistage water/sewage treatmentIonFluoride calcium
The invention relates to a method for recycling high-purity fluorine and phosphorus from a wastewater of phosphogypsum residue field. According to the different reaction conditions of calcium fluoride and magnesium ammonium phosphate, the implementation of the method is divided into two stages: in the first stage of recycling high-purity calcium fluoride: adjusting the pH (Potential Of Hydrogen) value of the wastewater of the phosphogypsum residue field by a sodium hydroxide solution to 3-6 to enable the fluoride ions and calcium ions in the wastewater to be reacted to generate calcium fluoride precipitate, filtering and recycling calcium fluoride; and the second stage of recycling high-purity magnesium ammonium phosphate: adjusting the pH value of the wastewater after the first section of recycling high-purity calcium fluoride by the sodium hydroxide solution to 7.5-9.5, adding a magnesium source and an ammonia source at the same time, generating magnesium ammonium phosphate, magnesium ammonium phosphate analogs or phosphate compounds in a crystalline state in a magnesium ammonium phosphate crystallization reactor, filtering and recycling magnesium ammonium phosphate. The water treated by the method disclosed by the invention has low impurity content and can be directly used as the industrial water and circulating cooling water in a phosphorus chemical production system.
Owner:HUBEI FORBON TECH

Comprehensive recovery method for cathode materials of ternary lithium ion battery

The invention discloses a comprehensive recovery method for cathode materials of a ternary lithium ion battery. The comprehensive recovery method comprises the following steps that the cathode materials of the ternary lithium ion battery are added into water for pulping treatment to obtain a pulping liquid, then concentrated sulfuric acid and hydrogen peroxide are added to be stirred, and filtering is conducted to obtain an acid leaching solution A; the acid leaching A is regulated to be acidic, excessive Fe powder is added to remove Cu impurity, then iron and aluminum impurities in the solution are removed by using a halotrichite method, and filtering is conducted to obtain a filtrate B; the filtrate B is regulated to be alkaline to precipitate a nickel element, a cobalt element and a manganese element, and filtering is conducted to obtain a solution C and filter residue D; the solution C is concentrated, and then a saturated sodium carbonate solution is added to obtain lithium carbonate precipitation; and the filter residue D is dissolved to obtain a solution E, and the solution E is extracted and separated to obtain a nickel-containing solution, a cobalt-containing solution anda manganese-containing solution. According to the comprehensive recovery method for the cathode materials of the ternary lithium ion battery, after the cathode materials of the ternary lithium ion battery are leached and impurities are removed, the nickel, cobalt and manganese elements are precipitated, the lithium element is separated firstly, prior recovery of lithium is achieved, and the recovery rate of the lithium element is improved.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY

Industrial method for selectively recycling copper and nickel from copper-nickel mud

The invention discloses an industrial method for selectively recycling copper and nickel from copper-nickel mud, belonging to the field of recycling non-ferrous metal resources. The industrial method comprises the following steps of: acid-leaching the copper-nickel mud; filtering leachate; punching the leachate to a sealed tubular slot from a circulating slot under the action of a circulating pump, rotating the solution in the slot at a high speed, and carrying out rotational flow electrolysis to remove the copper; returning electrodeposited solution to the leaching process for continuously carrying out leaching; and gathering the nickel in the copper-nickel mud for preparing nickel sulfate. According to the industrial method provided by the invention, an high-speed rotation electrolytic technology for a solution in an electrolytic cell is combined with other processes to recycle the metal in the solution for being continuously used for other industries, so that the waste material is changed into things of value for realizing recycling the resources; the current density and the current efficiency are high, the reagent consumption is low, the production cost is reduced, and performances of the enterprise are improved. Meanwhile, the solution is circulated in a closed-loop manner, so that no harmful gases are exhausted, and the existing circular economy and environmental protection theories are satisfied.
Owner:浙江科菲科技股份有限公司
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