80results about How to "Short leaching time" patented technology

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.

The invention relates to a method for leaching potassium in phosphorus potassium associated ore at low temperature by assisting with microwaves/ultrasonic waves. The method comprises the following steps of (1) mixing materials, taking phosphorus potassium associated ore powder and assistant fluorite to be evenly mixed, and then adding phosphoric acid for soaking to obtain a mixture; (2) conducting microwave and ultrasonic wave leaching; (3) obtaining primary filter residues and primary filter liquor; (4) obtaining secondary filter residues and secondary filter liquor; and (5) mixing a leaching liquid, mixing the obtained primary filter liquor and the obtained secondary filter liquor to obtain the leaching liquid containing potassium. The method has the advantages of substantially shortening heat conduction time, avoiding shortcomings of uneven heating in a traditional heating mode, being energy-efficient due to microwave heating, and almost having no other loss except for temperature rise of materials to be heated. Cavatition of the ultrasonic waves enables liquid to cause a series of movements such as swelling, compression and sinking and the like, and produced chemical effects and mechanical effects can change reaction conditions and quicken reaction speed.

The invention discloses a method for comprehensively recovering cobalt, copper and iron in a cobalt-copper alloy. The method is a full hydrometallurgical process and mainly comprises the following steps of: firstly, performing atomization oxidation on the molten cobalt-copper alloy by adopting high-pressure oxygen or oxygen-rich air to prepare powder; then adding a leaching agent, a catalyst and the cobalt-copper alloy into an autoclave, performing pressurized catalytic oxidative leaching to ensure that cobalt and copper in the cobalt-copper alloy are oxidized and leached out and enter a leach solution in the form of ions, wherein iron in the cobalt-copper alloy is leached, converted and finally remained in leach residues in the form of iron oxide red; finally, separating, purifying and refining the obtained leach solution to respectively obtain a cobalt product and a copper product which meet the international standard, and performing magnetic separation on the leach residues by adopting a strong magnetic separation method to obtain an iron oxide red product meeting the international standard. The method has the advantages of short flow, simplicity in operation, low energy consumption, high metal recovery rate, low cost and the like, and the comprehensive recovery utilization of the high-content iron in the cobalt-copper alloy is realized.

The invention relates to a comprehensive recycling method of a platinum-rhenium containing reformed spent catalyst. The comprehensive recycling method is used for leaching rhenium by pressurizing and alkaline-dissolving, is used for enriching platinum by normal-pressure acid dissolving, and is also used for comprehensively recycling aluminum oxide. The main flow comprises: (1), grinding material, namely, grinding the platinum-rhenium containing reformed spent catalyst to obtain powder materials with a grain size of 30-100 meshes; (2), pressurizing and alkaline-dissolving, namely, leaching rhenium by adopting a pressurizing method under an alkaline system to obtain leaching liquor L1 and leaching residue S1; (3), refining and rhenium extracting, namely, adding soluble sylvite to the leaching liquor L1 for refining the rhenium; (4), carrying out acid dissolving, namely, dissolving the leaching residue S1 by using an acid solvent to obtain leaching liquor L2 and leaching residue S2; (5), carrying out platinum refining, namely, refining the platinum in the leaching residue S2 to obtain metal platinum; and (6), carrying out aluminum sulfate recycling, namely, crystallizing the aluminum sulfate in the leaching liquor L2 to obtain a water purifying agent. The comprehensive recycling method of the platinum-rhenium containing reformed waste catalyst is simple in process flow and high in platinum and rhenium comprehensive recovery rate, wherein the platinum comprehensive recovery rate is higher than 99%, and the rhenium comprehensive recovery rate is higher than 92%. Meanwhile, the carrier is comprehensively recycled and utilized, so that the comprehensive recycling method is relatively environment-friendly.

The invention discloses a device for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting, which comprises a sulfuric acid low-temperature dynamic roasting kiln, and a high voltage constant-current tail gas liquefying treatment system which is communicated with the sulfuric acid low-temperature dynamic roasting kiln and purifies flue gas output by the sulfuric acid low-temperature dynamic roasting kiln, wherein the sulfuric acid low-temperature dynamic roasting kiln comprises a raw material storage tank, a sulfuric acid storage tank, a double-screw continuous mixer, a kiln body, a material stirring system arranged at the bottom of the kiln body, and a combustion chamber arranged outside the kiln body; and the high voltage constant-current tail gas liquefying treatment system comprises a cooling tower, a high voltage constant-current tail gas liquefying tower, a high-efficiency cyclone separator, an exhaust fan, and a foam tower. The invention also discloses a method for decomposing rare earth ore through sulfuric acid low-temperature dynamic roasting by the device. The device and the method has wide adaptability for decomposing minerals and ensure that the decomposition rate is over 96 percent; and the device and the method can ensure that the materials are fully decomposed and the final tail gas meets the emission standard.

The invention relates to a roasting method for extracting vanadium from vanadium-containing shale. According to the technical scheme of the invention, the method comprises the following steps of: uniformly mixing vanadium-containing shale raw ore with a vanadium-containing shale extraction roasting additive in a ratio of 1:(0.06 to 0.1), feeding the mixture to a roasting furnace, heating to 850 to 1000 DEG C at a temperature rise rate of 400 to 500 DEG C/h, maintaining the temperature for 1 to 2 hours, then adding the roasted product to dilute sulfuric acid with volume fraction of 4 to 10% in a solid-liquid mass ratio of 1:2, and leaching at 90 to 100 DEG C for 0.5 to 1 hour under the condition of stirring. The preparation method of the vanadium-containing shale extraction roasting additive comprises the steps of: preparing Mg compounds, namely NaClO3, Na2CO3 and CaCO3 and mixing uniformly, wherein the mass ratio of NaClO3:Na2CO3:CaCO3 is 1:1:(4 to 8):(6 to 10); and grinding until the particle size is not more than 0.15 mm. The method provided by the invention increases the leaching rate up to 86% to 87% and has the characteristics of high recovery rate, short roasting period, high leaching speed and little roasting pollution.

The invention discloses a methanol leaching castor oil process method. Regulating castor seed choose is done after the cleaning of the castor seeds free from impurity as well as insect damage. The seeds are of shell removal, crush or pre-pressure to make part of castor oil. The castor oil is leached with the ultrasonic or physical field aided condition method. Under the ultrasonic condition, the castor oil is leached by the methanol leaching solute, which improves the existing solute leaching method, greatly shortens the leaching time, decreases the raw material consumption and lowers the experiment cost, thus being the new oil leaching method of the lower cost, short leaching time and high oil production rate. The invention solves the problems that current bio-diesel preparation method has high requirements to the oil, long technique procedure, large consumption of various raw materials, reagents and equipments, serious reagent pollution and high production cost.

Disclosed is a microwave chemical method for totally extracting fluorine and rare earth from bastnaesite concentrate, including: alkaline conversion defluorination of bastnaesite through microwave irradiation, microwave-assisted leaching of fluorine, solid-liquid separation of leaching solution and microwave-assisted leaching of rare earth. The rare earth hydrochloric acid solution for leaching contains no fluorine ion, so that the fluorine interference of subsequent processes such as impurity removal can be completely avoided; the fluorine and the rare earth are leached with microwaves, which does not need the stirring, so that the automatic control is easy to implement; the fluorine and rare earth leaching speed is high, the leaching time is short and the complete leaching of fluorine and little residual alkali in the slag can be realized by two-time leaching; and no fluorine-containing waste water is discharged, and the total extraction of the rare earth can be realized by one-time leaching.

The invention discloses a method for recovering nickel, cobalt, iron and silicon from laterite-nickel ore by a combined leaching process. The method comprises the following steps: adding muck ore slurry and concentrated sulfuric acid after heating into a double-spiral material pushing reactor; dissolving reaction materials in water, then performing solid-liquid separation, and washing filtration residues to obtain normal-pressure leaching residues, a normal-pressure leaching solution and a washing solution; preparing limonite ore slurry from the washing solution and limonite, adding the limonite ore slurry and the normal-pressure leaching solution into a pressurization kettle for pressurization and leaching, hydrolyzing Fe<3+> in the normal-pressure leaching solution to a hematite precipitate, and releasing acid to re-leach the limonite; reducing the temperature, and performing solid-liquid separation to obtain pressurized leaching residues and a pressurized leaching solution; removing non-nickel and cobalt impurities in the pressurized leaching solution, and then recovering nickel and/or cobalt by an existing method; washing the pressurized leaching residues with a soda ash solution, and then drying to obtain fine iron powder; and performing screening treatment on the normal-pressure leaching residues to obtain silicon dioxide and fine sand. The method disclosed by the invention has the advantages of short leaching time, high nickel leaching rate, low acid consumption and effective recovery of iron and part of silicon.

The invention provides a cyanide-free extractant and a gold extracting method. The cyanide-free extractant comprises, by mass percentage, 0.5-2% of amino acid and 0.2-2% of alkali, wherein water serves as a solvent. According to the gold extracting method, the amino acid gold extracting agent free of toxicity to the environment is adopted for leaching of gold, the method is environmentally-friendly, free of toxin, short in leaching time and high in leaching rate, and waste water can be drained after being simply treated. According to the cyanide-free extractant and the gold extracting method, the leaching rate of gold ore easy to leach is high, is larger than 90% and can reach 95%; for traditional gold ore difficult to leach, such as ore which is not pretreated and contains pyrite cyanide arsenopyrite, the leaching rate is high as well and is larger than 85%, and the leaching rate is less than 30% compared with the leaching rate of a traditional cyaniding process of the same type of ore which is not pretreated, so that by the adoption of the cyanide-free extractant and the gold extracting method, the leaching rate of the gold ore difficult to leach can be increased greatly.

The invention discloses a purpose of a by-product ammonium thiosulfate generated in a steel-making waste water treatment process as a complexing agent for leaching silver and its application method. According to the invention, the by-product ammonium thiosulfate generated in the steel-making waste water treatment process as the complexing agent are reacted with the silver-containing solution for leaching silver; the by-product ammonium thiosulfate generated in the steel-making waste water treatment process is taken as the complexing agent for leaching silver, because thiosulfate radical ion and silver ion can form a stable complex, ammonia ion and silver ion can form stable silver-ammonia complex ion, therefore a better leaching effect is provided to silver chloride, silver oxide, silver sulfide and metal silver, and the ammonium thiosulfate solution possesses high leaching rate to silver under low concentration, the invention has the advantages of short leaching time, high leaching rate, good selectivity, low base metal leaching rate, small environment damage and small hidden trouble in safety production.

The invention discloses a method for producing electrolytic manganese by using low-grade manganese oxide (lean ore) through a three-ore mixing direct reduction process (called a three-ore method for short), which comprises the following steps of: adding sulfuric acid for leaching without heating by using low-grade manganese oxide mineral powder, low-grade high-sulfur high-iron waste residue and low-grade manganese carbonate tailings as raw materials; and removing harmful impurities through three times of impurity removal and three times of filter pressing to obtain a pure manganese sulfate solution containing 30-40g/L of manganese, adding an electrolytic additive, introducing into an electrolytic bath, and electrolyzing by taking a lead plate as an anode and stainless steel as a cathode to obtain an electrolytic manganese product with the manganese weight content of more than 99.7%. According to the method for producing the electrolytic manganese, the low-grade manganese oxide mineral powder, the low-price low-grade high-sulfur high-iron waste residues and a small amount of low-grade manganese carbonate tailings are used as raw materials, the three kinds of ores are all waste ores without market value, the production cost is greatly reduced, the leaching rate of manganese is high, the reduction conversion rate is high, the environmental pollution is small, and the produced high-purity electrolytic manganese product has good economic benefits. The yield is high and the quality is good.

The invention relates to a leaching method of zinc sulfide concentrates, and belongs to the field of wet metallurgy. Water, an oxidizing agent, the zinc sulfide concentrates, additives and a dispersing agent are added in a high-temperature and high-pressure reaction kettle to obtain a reaction system; under the condition of tightness, the reaction system in the high-temperature and high-pressure reaction kettle is heated and pressurized to reach a supercritical state, is reacted by 10-60 min to obtain a reaction product system, and is cooled to reach the room temperature; the solid/liquid-phase separation is performed to obtain zinc-contained leaching liquid and iron-contained oxide leaching slag; the additives are sulfur-contained additives or nitrogen-contained additives; the temperaturein the supercritical state is 380-500 DEG C; and the pressure is 22.5-40 Mpa. The zinc sulfide concentrates are leached by using supercritical water; and high zinc leaching rate and the deposition ofsuch metal as iron, copper and manganese can be realized at the same time.

A process for preparing the wet cotton seed protein dregs by leaching-out method includes such steps as loading the raw cotton seed protein material in storage tank, extracting oil in solvent, dephenolizing in methanol, and removing part of solvent.

The invention discloses a leaching method of refractory cobalt ore. The leaching method of the refractory cobalt ore comprises the following steps that (1), after a biomass reducing agent is crushed,a sulfuric acid solution is added for hydrolysis, wherein the biomass reducing agent is poplar or straw; (2) a hydrolyzed material is dissolved in water, and then the refractory cobalt ore is placed in for leaching; and (3) the leached material is subjected to solid-liquid separation to obtain a cobalt-containing leachate. In the method, the leaching reducing agent is wide in raw material source,environmentally friendly, low in leaching temperature and short in leaching time. No harmful gas is produced in the leaching process, environmental pollution of enterprises is reduced, the productioncost is reduced, and economic benefits and the yield are improved.