442 results about "Scheelite" patented technology

The invention relates to an ore dressing method of a low-grade scheelite, which is characterized by comprising the following steps: 1. tailing discard by gravity concentration; 2. iron removal by magnetic separation; 3. sulfide ore flotation; 4. normal-temperature rougher flotation of scheelite; and 5. heating concentration of the scheelite. The invention provides a lower-cost ore dressing method for dressing scheelite concentrates from the tailings of the low-grade scheelite. The invention has the characteristics that the comprehensive recovery cost is saved, the beneficiation feed grade of the scheelite is improved, the flotation feed ore quantity is reduced, the dosage of a flotation reagent is reduced, the used ore dressing reagent is more friendly to the environment, and secondary pollution can not be caused. The method of the invention is applicable for low-grade scheelite resources with 0.03 to 0.15 percent of WO3.

The invention discloses a beneficiation process of a molybdenum-tungsten oxide ore. The process of which is that: the liberation degree of ore crushing is higher than or equal to 70%; the flotation of molybdenum sulfide is preferred; the floatation tailing is classified and then a separation of slime and sand is carried out, wherein a slime and sand system takes alkali as the conditioning agent, sodium silicate as the depressant, and emulsified fatty acid as the collecting agent. The rough concentrate obtained from the separation of slime and sand is concentrated after being blended to obtain molybdenum-tungsten oxide ore collective concentrate. The collective concentrate is grounded again and added with the depressant, then a secondary concentrate can be gained through the concentration; the secondary concentrate is concentrated by means of Peter Roph method to obtain scheelite ore and oxidized molybdenum-tungsten beneficiation concentrate. The invention has the advantages that: 1. the invention discloses a beneficiation process flow for treating molybdenum-tungsten oxide ore; 2. the invention solves the difficulty of lowe technical specification of molybdenum - tungsten oxide ore beneficiation; 3. the invention completes laboratory tests and researches and fulfills industrialized implementation for the first time in China.

The invention discloses a method for decomposing scheelite. The method has the following specific operations of: preparing the solution of phosphoric acid and adding sulfuric acid; after heating to a temperature required for decomposing, adding the scheelite into a reaction tank for reacting; after finishing reacting, extracting tungsten from a filtrate obtained by filtering; and adding the phosphoric acid and the sulfuric acid to an initial level, and returning for performing mineral leaching. The method has the advantages that: the phosphorus content of the scheelite is not required strictly; floated rough concentrate of the scheelite does not need to be directly conveyed for smelting for removing phosphorus specifically any longer, so the cost of a phosphorus removing agent and the loss of the tungsten are saved; one-step high-efficiency normal-pressure leaching of the scheelite is realized; resource and energy consumption are saved; the decomposition rate of the scheelite can reach over 98 percent; the problem that Cl<-> and HCl in a conventional decomposing process is volatized seriously is solved; the cyclic utilization of the phosphoric acid is basically realized; leaching cost and wastewater discharge amount are reduced extremely; leaching equipment is simple and is convenient to operate; and industrialization is easy to realize.

The invention provides a method for separating and extracting tungsten-molybdenum from mixed solution of tungstate-molybdate. The method is characterized by: adding aluminum salt or magnesium salt for purification and impurity removal, adding calcium carbonate to precipitate tungsten selectively to obtain artificial scheelite, making the liquid obtained after tungsten precipitation subjected to absorption by ion exchange resin or extraction by a solvent extraction agent to obtain ammonium molybdate, adding acid into the artificial scheelite for decomposition to obtain artificial tungstic acid, and performing ammonia dissolution and crystallization of the artificial tungstic acid to obtain ammonium tungstate. Therefore, effective separation and recovery of tungsten and molybdenum are realized; and in addition, the method has the advantages of short flow, high process adaptability, low consumption of reagents, low processing cost, high recovery rate of metal, good operating environment, and the like.

The invention provides a method for extracting tungsten from scheelite and producing high-quality calcined gypsum, comprising the following steps: adding a mixed acid of phosphoric acid and sulphuric acid to decompose scheelite; and after decomposition, adding hydrated gypsum seed crystals to finish the dewatering conversion process of dihydrate gypsum to obtain hydrated gypsum with good properties. The invention has the following advantages: the efficient atmospheric pressure leaching of scheelite is realized, the resource and energy consumption is saved, and the decomposition rate of scheelite can reach over 98%; the serious problems of Cl<-> corrosion and HCl volatilization in the traditional acid decomposition process can be overcome; the recycling of phosphoric acid is basically realized, and the leaching cost and the wastewater discharge are greatly reduced; the leaching device is simple, the operation is convenient and industrialization is easy to realize; the obtained byproduct gypsum has pure quality and can be used to produce gypsum boards, and can be used in retarder, plaster and the like produced by using cement; and due to the recrystallization process, the P2O5 content in gypsum is further reduced to below 0.5%.

A structural formula of a 6-aliphatic hydrocarbon amido hexyl hydroximic acid collecting agent is represented by a formula (I), wherein R represents C2-C18 aliphatic hydrocarbon group. The preparation method comprises the steps as follows: caprolactam and hydroxylamine hydrochloride or hydroxylamine sulphate are taken as raw materials, methylbenzene is taken as a solvent, the reaction temperature ranges from 80 DEG C to 110 DEG C, the reaction lasts for 1-4 hours, and 6-amino hexyl hydroximic acid is generated; 6-amino hexyl hydroximic acid reacts with C2-C18 fat carboxylic acid at the reaction temperature ranging from 100 DEG C to 160 DEG C for 1-4 hours to generate 6-aliphatic hydrocarbon amido hexyl hydroximic acid, and the product yield can be higher than 91%; and 6-aliphatic hydrocarbon amido hexyl hydroximic acid used in flotation of scheelite, wolframite, tombarthite ore, tin ore, bauxite, titanic iron ore or fluorite ore is taken as the collecting agent, so that the flotation recovery rate can be increased by 3%-10%.

The invention discloses a mineral processing method for recycling scheelite/molybdenum oxide ores from molybdenum sulfide flotation tailings. The mineral processing method comprises the following steps of: taking the molybdenum sulfide flotation tailings as raw materials and further levigating the raw materials; carrying out reselection and/or flotation and desliming on ore pulp which is levigated according to demands; adding a regulator, an auxiliary inhibitor, an inhibitor and a modified aliphatic acid collecting agent into the flotation tailing pulp; and recycling the scheelite/molybdenum oxide ores at room temperature so as to obtain scheelite/molybdenum oxide ore concentrates after roughing, scavenging and concentrating. The mineral processing method disclosed by the invention has the advantages of simple process flow, low production cost, resource saving, high product level and high recovery.

The invention discloses a method for receiving tungsten and phosphorus from high phosphorus white tungsten ores, which comprises: decomposing the ores by using mixed acid of phosphoric acid and sulfuric acid, wherein phosphorus-containing ore are converted into phosphoric acid, tungsten-containing ore are converted into phosphotungstic acid, and both the phosphorus and the tungsten enter solution; when the total P2O5 mass content in circular leaching filtrate surpasses 30 percent, extracting tungsten from the circular leaching filtrate, extracting phosphoric acid by using a solvent extraction method, reducing P2O5 mass content in the circular leaching filtrate by controlling the extraction rate of phosphoric acid, resupplying sulfuric acid, and returning to newly leached high phosphorus white tungsten ores; and thus, recovering tungsten and phosphoric acid from the leaching filtrate respectively. The method has the advantages of comprehensively recovering tungsten and phosphorus from ores, lowering requirements on tungsten ore raw material, reducing pressure in ore dressing step, ensuring over 98 percent decomposition rate of the white tungsten ore, recycling leaching agent, greatly reducing leaching cost and waste water discharge, along with simple leaching equipment, convenient operation and easy industrialization implementation.

The invention relates to a preparation method for a bismuth vanadate composite photocatalyst loaded with strontium ferrite, and belongs to the field of inorganic catalytic materials. According to the preparation method, bismuth vanadate adopts the structure of scheelite in the monoclinic system; while the degradation rate, of the composite photocatalyst loaded with the strontium ferrite, for methylene blue can reach 93 percent in 5h, the degradation rate, of a similar composite photocatalyst of bismuth vanadate loaded with ferroferric oxide, for the methylene blue can reach 80 percent in 8 h. Moreover, the prepared composite photocatalyst has photocatalysis activity in relatively-wide wavelength range, and can efficiently and cyclically degrade organic pollutants in heteroaromatic dye-type wastewater under the irradiation of ultraviolet light, visible light and natural light through photocatalysis. Meanwhile, the composite catalyst is convenient to recover with the recovery rate not less than 92 percent; the degradation rate, of the recovered composite catalyst, for the methylene blue can reach 60 percent in 5h. The preparation method is simple and has an excellent application prospect.

The invention provides a method for comprehensively recovering tungsten and fluorine from minerals, namely a mixed acid of phosphoric acid and sulfuric acid is adopted for decomposing complex calcium-containing minerals containing fluorite, scheelite, apatite, and calcite, wherein the fluorite is decomposed to fluorine hydride or silicon tetrafluoride to escape, and absorption treatment is performed for preparing hydrofluoric acid or a fluoride salt; and the scheelite is transformed to phosphotungstic acid to enter into a solution, and filtrate after filtration is supplemented into the consumed sulfuric acid and the phosphoric acid after extraction of the tungsten and returned to the new-round mineral leaching. The method disclosed by the invention has the advantages of comprehensively recovering the fluorine and the tungsten from the minerals, reducing the requirements on the fluorite or the tungsten ore raw material, reducing the pressure on a mineral dressing link, improving the comprehensive recovery rate and simultaneously ensuring the decomposition rate of the fluorite and the scheelite, wherein the decomposition rate of the fluorite is above 98%, and WO3 contained in decomposition slag is reduced to below 0.5%; furthermore, a leaching agent can be recycled, so that leaching cost and wastewater emission are greatly reduced; and the method also has the advantages of simple leaching equipment, convenience in operation and easiness in realization of industrialization.

The invention discloses an organic solvent-water heating method for preparing football-shaped mesoporous BiVO4, comprising the following experimental steps: under the condition of stirring, bismuth nitrate and ammonium metavanadate are dissolved in a mixed solution of ethanol, ethylene glycol, nitric acid and laurylamine (oleylamine or mixed liquid of oleylamine and oleic acid); a sodium hydroxide (2mol / L) alcohol solution of ethanol and ethylene glycol with the volume ratio of 1 to 1 is used to regulate the pH of the solution to be equal to 1.5-3; the mixed solution is transferred in a stainless steel self-pressing vessel (the volume filling degree is about 70%) with a Teflon inner liner and is put in an incubator to carry out organic solvent - water heating treatment for 12h in constant temperature of 100 DEG C; and the mixed solution is naturally cooled to room temperature after taking out. The obtained product after the organic solvent - water heating treatment is filtered, is washed with deionized water and absolute ethanol and is dried for 12h at the temperature of 60 DEG C, and then football-shaped mesoporous BiVO4 micron particles with a monoclinic scheelite structure is obtained. The porous bismuth vanadate obtained by the method has good application prospects in the fields of photocatalysis, electrode materials, pigments, ion conductive ceramic, and the like.

The invention relates to the decomposition technology of scheelite, in particular to a method for decomposing scheelite by adopting ammonium phosphate and liquid ammonia. The method is characterized in that the ammonium phosphate and the liquid ammonia are used as decomposers; the amount of the ammonium phosphate is not less than 1.8 times theoretical amount; the ammonia concentration is not lessthan 30g/l; the reaction temperature is 180-220 DEG C; the heat preservation time is 1.5-5 hours; the liquid-solid ratio is (2:1)-(3:1); and the stirring speed is 25-450r/min. The method has the positive effects of realizing closed cyclic smelting and zero discharge of scheelite, simultaneously lowering the production cost and increasing the economic benefits.

The invention discloses a scheelite beneficiation method. The scheelite beneficiation method comprises the steps of: roughly grinding raw mineral with no need of desliming; screening the raw mineral in a sieve with 200-250mu m, roughly grinding the material on the sieve again, carrying out strong magnetic separation and discarding on the mineral under the sieve, wherein mainly magnetic garnets and other magenetic minerals are mainly discarded; carrying out scheelite normal temperature flotation on the nonmagnetic mineral after the nonmagnetic mineral is finely ground; carrying out scheelite warming flotation on concentrate obtained after the rough flotation to obtain scheelite concentrate; and carrying out normal temperature floatation on discarded magnetic concentrate, adding flotation middlings into the nonmagnetic scheelite concentrate to be finely ground. The scheelite beneficiation method aims at the mineral characteristics of the scheelite, the raw mineral contains a large amount of weak magnetism calcium and iron garnet gangue, so the recovery rate can be influenced due to the argillization caused by excessive grinding. The scheelite beneficiation method utilizes a ferromagnetic beneficiation method to effectively separate the magnetic ores, so that the excessive grinding condition is lowered, and the scheelite is preliminarily separated and beneficiated. The scheelite beneficiation method can enhance the mineral grinding efficiency, reduces the mineral grinding energy consumption, enhance the selection grade of the scheelite, reduces the beneficiation amount of the flotation, lowers the dosage of flotation reagents, and enhances the total recovery rate of the scheelite. The scheelite beneficiation method is especially suitable for medium grade and low grade scheelite beneficiation.

The invention discloses an ore dressing method for separation and recovery of scheelite and fluorite from sulfur flotation tailings of polymetallic ore. The ore dressing method can eliminate the shortcomings caused by a preferential flotation process in the prior art by simultaneously performing bulk flotation on the scheelite and the fluorite and further separating the scheelite from the fluorite, further significantly improve the recovery rate of the scheelite and the fluorite and realize high-efficient recovery of two minerals, namely the scheelite and the fluorite in the polymetallic ore.Furthermore, the scheelite and the fluorite are dressed through a rough concentration bulk flotation and fine concentration separation two-stage process, so that indexes in various stages of operations are convenient to stipulate and control, and quantification of the indexes of the ore dressing process of the scheelite and the fluorite and operation management can be effectively realized.

The invention discloses a benefication method for concentrating fine tungsten ore in tailings by warming scheelite, which is characterized by comprising the following steps in turn: performing desliming and reagent removal; condensing concentrate after desliming and reagent removal, which is added with water, into 26 to 44 percent of pulp density, and controlling the pH of pulp at about 8.5; performing floatation on the fine tungsten ore; adding regulators of sodium fluosilicate, soluble glass, aluminium sulphate and lead nitrate; and adding collecting agents of benzohydroxamic acid and sulfated oleate soap, and performing rough concentration, concentration and scavenging to obtain the fine tungsten ore concentration and fine tungsten tailings. The method has simple recovery process flow, stable benefication process, high tungsten recovery rate, and low cost of reagents; the used benefication reagents do not pollute environment; and tailing water can meet the emission requirement. The method is suitable for the fine tungsten ore, of which the WO3 content is 0.95 to 5.10 percent, the ratio of peanut ore to the scheelite is between 1:9 to 9:1, and the occupancy rate of WO3 metal smaller than 30 microns is more than or equal to 60 percent, and which is subjected to concentration of the tailings by warming the scheelite and then reconcentration of the tailings by a shaker.

The invention relates the method for preparation of pucherite composite photocatalyst loaded on cobalt oxide. The photocatalyst comprises semi-conductor pucherite particle and cobalt oxide particle. The pucherite is monoclinic crystal system scheelite structure, and the diameter is 100nm-5mum. The grain diameter of cobalt oxide is 10nm-1mum. The mass ratio of cobalt oxide and pucherite is 1-100mg/g. The specific surface area of composite photocatalyst is 0.5-5m2/g. The said photocatalyst can effectively degrade the noxious and harmful chemical under the ultraviolet light, visible light and natural light radiating. And the photocatalyst is easy to separate and recover.

The invention provides a mineral separation and enrichment method suitable for associated scheelite in molybdenite floatation tailings. The method includes the steps of low-intensity magnetic separation, high-intensity magnetic separation, non-magnetic ore pulp material size fraction grading, gravity separation, middling regrinding, regrading gravity separation and the like. A high-grade and high-recovery scheelite concentrate product is obtained, the associated low-grade scheelite resource in Cu-Mo polymetallic mixed associated ore is effectively and comprehensively recovered and used. The method can be widely applied to the field of recovering and using the associated low-grade scheelite resource.

Disclosed is a pretreatment method of tungsten mineral materials. The pretreatment method of the tungsten mineral materials is characterized by including the following steps of raw material preparation and clinker sintering, the raw material preparation includes that the tungsten mineral materials (scheelite, wolframite, scheelite and wolframite mixed mineral and/or tungsten fine silt) are mixed with a certain quantity of calcic substances and mineralizer to be finely ground to obtain raw materials, and the clinker sintering includes that the prepared raw materials are calcinated under special conditions to obtain clinker. The pretreatment method of the tungsten mineral materials has the advantages that the adaptability is wide, and the method is suitable for all tungsten mineral materials, especially scheelite; (2) added calcic substances are cheap and easy to obtain; (3) the calcination temperature is low, the operation is simple, and the industrial application is easy; (4) tungsten in the obtained clinker is good in leaching performance, fully leaching can be achieved by a sodium carbonate solution or an ammonium carbonate salt solution at low temperature, especially when leaching is performed by the ammonium carbonate salt solution, the economical circulation of the solution during APT production can be achieved, and thereby, discharging of wastewater during production can be eliminated.

The invention discloses a surfactant hydrothermal method for preparing leaf-shaped, tubular and paraphlomis-kwangtungensis-shaped BiVO4. The method comprises the steps that: bismuth nitrate, ammonium metavanadate, hydrogen nitrate, and triblock copolymer P123 are resolved in hydrogen nitrate aqueous solution with a concentration of 2mol/L under the stirring condition, then 14 percent of ammonia water by weight is added drop by drop, the pH of the obtained solution is adjusted to 9, the solution containing yellow precipitate is transferred to a stainless steel gravity reactor the lining of which is made from polyfluortetraethylene and is placed and treated in an incubator at a temperature of 180 DEG C for 6 hours, the solution naturally cools down to the room temperature after being taken out, the product obtained after treatment is dried at a temperature of 60 DEG C for 12 hours and then is sintered to obtain the leaf-shaped BiVO4 micron particles with monocline scheelite structure. In the surfactant hydrothermal method, the obtained samples when treated with a pH of 10 in the incubator at a temperature of 180 DEG Care tubular pucherite micron particles with monocline scheelite structure; the obtained samples when treated with a pH of 3 in the incubator at a temperature of 80 DEG C are paraphlomis-kwangtungensis-shaped pucherite micron particles. The surfactant hydrothermal method for preparing leaf-shaped, tubular and paraphlomis-kwangtungensis-shaped BiVO4 are characterized by cheap raw materials, simple process, controllable target product particle shape and crystalline structure, etc.

The invention discloses an alpha-hydroxy unsaturated alkylphosphonic acid compound as well as a preparation method and application of the alpha-hydroxy unsaturated alkylphosphonic acid compound. The alpha-hydroxy unsaturated alkylphosphonic acid compound has the structural formula I as shown in the specification. The preparation method comprises the steps: subjecting 2-ethyl-2-hexenal and hypophosphorous acid or hypophosphite to addition reaction in the existence of an acid catalyst to generate 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphorous acid; subjecting 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphorous acid and an oxidizing agent to reaction to generate 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphonic acid. 30-600g/t of 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphonic acid is used as a flotation collector for bauxite, ilmenite, rutile, scheelite, wolframite, rare earth ores, tin ores, fluorite ores or lithium ores, and the pH value of a flotation solution is controlled at 4-12, so that a target ore and a gangue mineral can be effectively separated.

The invention provides a method for tungsten from wolframite or scheelite and wolframite mixture ore through adding of high-phosphorus scheelite. In the ore grinding process of tungsten mineral raw materials (wolframite or scheelite and wolframite mixture ore), the high-phosphorus scheelite is added, fine grinding and pulp mixing are carried out, and obtained ore pulp is decomposed through phosphoric acid-sulfuric acid; after the reaction is finished, the tungsten is extracted from an obtained leaching agent, then, sulfuric acid is supplemented again, and mineral leaching is carried out again. The method has the advantages that the limitation that a sulfuric acid-phosphoric acid mixing system cannot treat the wolframite and the scheelite and wolframite mixture ore is broken through, and the wolframite and the scheelite and wolframite mixture ore is efficiently decomposed at the constant temperature and constant pressure under the system; phosphorus in the high-phosphorus scheelite can be comprehensively utilized, and meanwhile, the decomposing rate of the tungsten ore can reach more than 97 percent; the added phosphorus can generate phosphoric acid in the decomposing process, the method can be used for making up the phosphoric acid consumed in the decomposing process, energy is saved, and the leaching cost is reduced; and the whole technological process is convenient to operate, and the industrialization is easily achieved.

The invention discloses a mineral separation method for scheelite containing rich pyrrhotite, which comprises the following steps of: magnetically separating to obtain pyrrhotite rough concentrates and magnetically separated tailings; roughly separating, secondarily scavenging and secondarily blankly finely separating the pyrrhotite rough concentrates to obtain pyrrhotite concentrates and floating sulfur tailings; roughly separating, secondarily scavenging and secondarily finely separating the magnetically separated tailings to obtain white tungsten rough concentrates and floating tungsten tailings; and concentrating the white tungsten rough concentrates, carrying out floatation at normal temperature or the temperature of 80-100 degrees centigrade to obtain white tungsten concentrates and cleaner tailings. The method disclosed by the invention eliminates the influence caused by the pyrrhotite which is difficultly removed in the traditional flotation method, not only guarantees the quality of the tungsten concentrates but comprehensively recovers the pyrrhotite, and is suitable for mineral separation of the scheelite containing rich pyrrhotite.