62 results about "Monazite" patented technology

The invention discloses a filtering aid method for improving the filtering efficiency of monazite superior soluble slag, which comprises the following steps: step 1, carrying out solid-liquid separation on mixed slurry after alkali cake superior soluble callback to obtain filter residue 1 and filtrate 1; step 2, adding water into the filter residue 1, mixing and stirring according to a liquid-solid ratio of (1-2.5): 1 to react for 0.5-4 hours, and carrying out solid-liquid separation on ore pulp after the reaction to obtain a filter residue 2 and a filtrate 2; 3, if the ore pulp filtering speed in the step 2 is lower than 20 L / (m < 2 > * h) or the water content of obtained filter residues 2 is larger than 60%, the step 2 is repeated for the filter residues 2, the composite reducing agent with the preset mass is added, and stirring reaction is conducted for 2 hours till the water content of the filter residues is smaller than or equal to 60% or the ore pulp filtering speed in the plate and frame filtering process is larger than or equal to 20 L / (m < 2 > * h); in the step 3, the mass ratio of the added composite reducing agent to the original dry slag is (5-50) kg: 1t, and the composite reducing agent comprises sodium sulfite and thiourea in the mass ratio of (1-2): 1. The invention aims at shortening and improving the slag filtering performance so as to shorten the filtering time.

The present invention discloses a process for efficiently separating bastnasite and monazite from mixed rare earth concentrates, comprising the following steps: S1: The ore sample is subjected to primary centrifugal gravity separation for roughing. The gravity separation concentrate is finely ground, and after grinding, the gravity separation concentrate and the gravity separation tailings are mixed and then enter the flotation operation; S2: Water is added to adjust the pulp concentration and pH value, a sulfate composite inhibitor is added, a hydroxamic acid composite collector is added, and octanoic acid is added as a foaming agent for roughing to obtain a bastnasite roughing concentrate and a bastnasite roughing tailings; S3: The pH value of the bastnasite roughing concentrate pulp is adjusted, the same composite inhibitor and collector as those in the roughing are added, and two-stage cleaning is carried out to obtain a bastnasite concentrate; S4: The roughing tailings are finely ground, and scavenging is carried out after grinding; the pH value of the bastnasite roughing concentrate pulp is adjusted, the same composite inhibitor and collector as those in the roughing are added, and one-stage scavenging is carried out to obtain a monazite concentrate. The process of the present invention is simple and has less reagent consumption.

The invention relates to a high-reflectivity high-entropy rare earth phosphate radiation refrigeration pigment, the high-entropy rare earth phosphate radiation refrigeration pigment has a monazite phase with a monoclinic system structure, the chemical formula of the pigment is (A1xA2yA3zA4uA5v) PO4, A1, A2, A3, A4 and A5 are any five rare earth cations of La, Ce, Yb, Gd, Nd and Eu, the cations are in an equimolar ratio, and x, y, z, u and v meet the condition that x + y + z + u + v = 2. Meanwhile, the invention also discloses a preparation method of the high-entropy rare earth phosphate radiation refrigeration pigment. The high-entropy rare earth phosphate radiation refrigeration pigment has high infrared emissivity in air, the emissivity reaches 0.90 or above within the wave band of 8-13 microns, the solar reflectivity reaches 0.93 or above within the wave band of 0.3-2.5 microns, and the high-entropy rare earth phosphate radiation refrigeration pigment has wide application prospects in the fields of building energy conservation, urban heat island effect reduction, photovoltaic power generation efficiency improvement and the like.

The present disclosure describes an eco-friendly bio-based process for effectively recovering a rare earth metal from a rare earth metal source, particularly a low-grade phosphate mineral such as monazite, through solvo-chemical extraction.

The invention discloses a neodymium, gadolinium and erbium doped composite ceramic solidified body and a preparation method thereof, and belongs to the field of non-metallic materials. The ceramic solidified body is of a two-phase structure, and the two phases are pyrochlore and monazite; the composite ceramic solidified body comprises GdPO4, Er2Ti2O7 and NdErTi2O7, and the leaching rate of the composite ceramic solidified body is 10 <-7 > g.m <-2 >. D <-1 >. The preparation method of the solidified body comprises the following steps: by taking Zn2TiO4, CaHPO4, SiO2 and B2O3 as solidified body matrixes, adding lanthanide oxides Nd2O3, Gd2O3 and Er2O3, mixing, uniformly grinding, carrying out high-temperature solid-phase reaction on the obtained mixed powder, and naturally cooling to room temperature after the reaction is finished, so as to obtain the monazite phase and pyrochlore phase ceramic solidified body. The ternary multiphase ceramic solidified body has good mechanical performance and leaching resistance, the leaching rate of lanthanide series elements is in the order of magnitude of 10 <-7 > g.m <-2 >. D <-1 >, and the ternary multiphase ceramic solidified body has an excellent solidification effect and has reference significance for deep geological storage of high-level waste.

The present invention relates to the technical field of monazite dating, specifically to a synthesis method of monazite standard samples and the application of dual dating methods. It includes the following steps: weighing raw materials according to the stoichiometric ratio of U, Th, and Pb concentrations of the standard sample to be prepared, processing the raw materials into powder, and then grinding, compressing, and calcining them multiple times; fully grinding the sample after heat cycle treatment, mixing it with a flux and grinding evenly, and then pouring it into a crucible; placing the crucible in a high-temperature furnace to fully melt and uniformly mix all substances, quickly taking out the crucible, and rapidly quenching it to form a uniform yellow transparent phosphate glass, thereby artificially synthesizing a phosphate glass standard sample to be used for measuring the U concentration in monazite by laser ablation-inductively coupled plasma mass spectrometry, and further achieving the simultaneous and accurate acquisition of the U-Pb age and fission track age of monazite.

This invention discloses a method for precipitation separation and ceramic solidification of divalent strontium and tetravalent uranium in radioactive waste liquid, relating to the field of radioactive waste liquid treatment and disposal. U in high-level radioactive waste liquid is in the form of hexavalent uranyl (UO2). 2+ U exists in the form of hydrogenation catalytic reduction, and the present invention uses hydrogenation catalytic reduction to prepare U. 4+ Sr 2+ and U 4+ ionic radius and Ln 3+ Due to the significant differences, CePO4·0.667H2O cerium phosphate, which has a stronger nuclide-containing capacity, was selected as the co-precipitation enrichment agent for Sr. 2+ and U 4+ Separation precipitant. Inexpensive raw materials such as UO2(NO3)2·6H2O, Sr(C2H3O2)2, NH4H2PO4, and Ce(NO3)3·6H2O are selected. By controlling the Sr... 2+ :U 4+ Ion ratio, reaction time, temperature, pH, and preparation of well-developed Sr crystals 2+ / U 4+ The precipitate of cerium phosphate solid solution with high solid content is avoided by using spark plasma solid-state sintering technology to prevent grain agglomeration and adhesion during high-temperature dehydration and crystal transformation of cerium phosphate. Furthermore, pressure sintering can promote further growth of nanocrystals and promote U... 4+ and Sr 2+ Homogenization within the monazite ceramic solidified body enables a one-step preparation of monazite ceramic solidified body from a lanthanite solid solution.

This invention proposes a combined inhibitor for separating bastnaesite and monazite, along with its method and application. The raw materials for the combined inhibitor include small organic molecules and microbial polysaccharides; the small organic molecules include one or more of oxalic acid, malic acid, tartaric acid, lactic acid, succinic acid, and citric acid; the microbial polysaccharides include one or more of currant gum, guar gum, xanthan gum, and gellan gum. This invention achieves highly selective inhibition of monazite on the mineral surface through the synergistic adsorption and action of the inhibitor, with small organic molecules and microbial polysaccharides as the main components, thereby efficiently separating bastnaesite under mild flotation conditions. It offers advantages such as good selectivity, strong action, low reagent cost, and environmental friendliness.

The invention provides a method for determining oil and gas reservoir forming period based on monazite in-situ U-Pb dating, which comprises the following steps: collecting sedimentary rock and metamorphic rock samples of a petroliferous basin, screening out authigenic monazite particles with an annulus structure from the samples of the petroliferous basin, and carrying out in-situ U-Pb dating on the authigenic monazite particles to determine the oil and gas reservoir forming period. Acquiring initial U-Pb age data of the sample; verifying the preliminary U-Pb age data of the sample by combining with a standard sample to obtain the accurate age of the sample; the method comprises the following steps: analyzing a monazite annulus structure, identifying a multi-stage fluid flow event, establishing a mapping model of a basin thermal evolution history and an oil and gas reservoir forming period, and determining the basin oil and gas reservoir forming period according to the mapping model of the basin thermal evolution history and the oil and gas reservoir forming period. The breakthrough of the oil and gas reservoir forming period from'indirect inference 'to'direct dating' is realized, and the dating precision of the oil and gas reservoir is improved.

The present application relates to the technical field of health-care materials, and discloses a rare earth composite energy health-care product based on synergy and a preparation method thereof, which comprises monazite fine powder 10 parts by weight, silico-aluminate composite network forming agent 75-80 parts by weight, in-situ reduction and network modifier 5-10 parts by weight, and pore forming agent 3-5 parts by weight; the preparation method comprises the following steps: crushing and grading the raw ore to obtain fine powder by intercepting high-density radioactive associated ore; mixing and kneading the fine powder and the remaining components to form a green body; performing three-stage step calcination to sequentially complete low-temperature pore forming, high-temperature magnesium hot reduction to generate lattice oxygen vacancies, and introduction of high-temperature water vapor to promote the generation of amorphous liquid phase to solid-solution-embed radioactive nuclides; and finally, forced air cooling and depolymerization and crushing are performed to obtain the finished product. The present application effectively reduces the radioactivity background of the material, blocks the physical channel for the escape of decay gas, and enables the product to have the functions of safe and stable far-infrared radiation and release of negative oxygen ions.

The present application relates to the technical field of rare earth concentrate processing, and particularly relates to a rare earth concentrate processing method. The rare earth concentrate processing method comprises the following steps: mixing and roasting a rare earth concentrate with a calcium-containing compound, silicon dioxide and carbon powder to obtain a roasted ore; adding water to the roasted ore to obtain a slurry; adding acid to the slurry to react, and then performing solid-liquid separation to obtain an acid leaching residue and a rare earth chloride solution. The present application has the advantages of simple process flow, high rare earth recovery rate, short reaction time, green environmental protection, low cost, and diversified applicability of rare earth grade. In the present application, the silicon dioxide can increase the decomposition activity of fluorcarbonate cerium and monazite in the rare earth ore, and can generate a rare earth compound that is easy to leach out, thereby improving the decomposition rate of the rare earth concentrate. Calcium can also play a role in fluorine fixation. The rare earth decomposition rate of the present application is above 98%, and the rare earth leaching rate is above 96%.

The utility model belongs to the technical field of monazite, and particularly relates to a monazite production waste conveying device which comprises a belt conveyor and a U-shaped frame, the belt conveyor is installed above the U-shaped frame, two connecting plates are installed in the U-shaped frame, a rotating shaft penetrates through the two connecting plates, a rotating plate is installed on the periphery of the rotating shaft, and the rotating plate is connected with the U-shaped frame. A first driving motor is installed on the side face of the connecting plate, the output end of the first driving motor is detachably connected with the end of the rotating shaft, a screening mechanism and a collecting mechanism are installed in the U-shaped frame and located below the connecting plate, and a pressure sensor is installed above the rotating plate. And after the weight reaches the preset weight, the waste enters the screening mechanism, the waste treatment efficiency is remarkably improved, the collecting mechanism can collect fine particles of the monazite waste, workers can clean the waste easily, and the workload of the workers is reduced.

The present application relates to the technical field of mineral processing engineering, and particularly relates to a chemical beneficiation method for upgrading and reducing calcium content of mixed rare earth concentrate. The chemical beneficiation method of the present application mainly comprises multiple procedures such as chemical leaching, separation and optional drying, wherein the chemical leaching is carried out in two stages. The chemical beneficiation method of the present application reduces the content of calcium oxide in the rare earth concentrate, improves the grade of the mixed rare earth concentrate, provides conditions for separating bastnaesite from monazite and clean development of rare earth smelting, is beneficial to the optimization and improvement of the rare earth smelting process, and reduces the pollution to the environment; provides raw materials for niobium and scandium extraction; the generated intermediate products can be converted into products, basically realizing zero emission, achieving the purpose of comprehensive utilization, and the whole method is green, environmentally friendly and waste-free.

The invention relates to the technical field of negative ion liquid extraction, in particular to a tourmaline negative oxygen ion liquid preparation method and system.The tourmaline negative oxygen ion liquid preparation method comprises the steps that tourmaline powder, monazite powder and infrared mineral powder are mixed and stirred to obtain mixed tourmaline powder; adding a sodium hydroxide solution into the mixed tourmaline powder for secondary grinding to obtain mixed slurry; determining the density of regenerated particles on the inner wall of the reaction tank; the mixed slurry and deionized water are added for heating and stirring to obtain deionized slurry, the heating rate is determined according to the characteristic peak intensity, or the flowing trend direction of the deionized slurry guided by an electromagnetic field is determined according to the viscosity of the deionized slurry; sequentially adding hydrochloric acid and hydrogen peroxide into the deionized slurry, and performing medium-speed mechanical stirring according to the flowing trend direction of the deionized slurry guided by an electromagnetic field; and separating out tourmaline negative oxygen ion extraction liquid. According to the invention, the extraction efficiency is improved.

The present disclosure is generally directed to methods for forming anhydrous rare earth and actinide phosphate minerals. In some embodiments of the present disclosure, the method generally comprises subjecting rare earth or actinide phosphates or salts thereof to microwave radiation.

The invention discloses a method for extracting and separating rare earth, iron and uranium in monazite excellent molten slag, which comprises the following steps: step 1, a hydrochloric acid complete dissolution step: realizing preliminary release of valuable elements in the monazite excellent molten slag; 2, oxalic acid precipitation, wherein specific separation and solution purification of thorium are achieved; 3, primary uranium extraction is conducted, and preliminary separation of rare earth elements and uranium iron is achieved; step 4, a rare earth recovery step; 5, back extraction is carried out, and preliminary enrichment of uranium and iron is achieved; 6, secondary extraction of uranium to realize uranium-iron separation; step 7, iron precipitation; step 8, uranium back extraction; and 9, uranium product forming. The method aims at achieving step-by-step extraction and separation of rare earth, iron and uranium in the leaching solution of the optimal dissolving slag, the problem that uranium and iron are difficult to separate in the existing extraction process is solved, and the recovery rate of valuable elements of rare earth and uranium is increased.

A device and method for comprehensive utilization of monazite type rare earth concentrate belong to the field of rare earth comprehensive utilization and recovery, the device comprises a continuous packed bed, a two-stage multi-chamber furnace reactor and a condenser, an aluminum oxide chlorination reaction occurs in the lower part of the middle feeding port of the multi-chamber furnace, the generated aluminum chloride is used as raw material for the chlorination reaction of the rare earth concentrate in the upper part of the middle feeding port of the multi-chamber furnace, the cost of obtaining aluminum chloride is reduced, and the heat utilization efficiency is improved. The solid phase and the gas phase complete the reaction in the multi-chamber furnace in a countercurrent manner, compared with conventional gas-solid reactors, the heat utilization rate of the system reaches more than 80%, and the chlorine utilization efficiency reaches more than 99%. The continuous packed bed is used for carbon and carbon dioxide reaction to obtain carbon monoxide raw material as the heat source and carbon source of the chlorination reaction, after the carbon thermal chlorination reaction is completed, the carbon dioxide returns to the continuous packed bed for recycling, and the whole process does not produce waste gas and waste residue.

The invention discloses a monazite smelting laboratory wastewater treatment method, which comprises: 1, controlling the temperature of laboratory wastewater at 30-90 DEG C, adding an alkali cake, carrying out a stirring reaction for 0.5-2 h, and after the reaction is completed, carrying out solid-liquid separation to obtain a phosphorus removal wastewater filtrate and a phosphorus-rare earth co-precipitation filter residue; 2, the filtrate in the step 1 is subjected to adsorption treatment through a silica gel adsorption column, adsorption tail liquid is obtained, and the total amount of thorium and uranium in the adsorption tail liquid is reduced to 0.3 ppm or below; and step 3, transferring the adsorption tail liquid into an ozone column, filling the ozone column with a silicon-aluminum compound catalyst material, and continuously introducing ozone into the ozone column through an ozone generator so as to reduce the COD value in the adsorption tail liquid to below 50ppm through ozone oxidation, thereby finally obtaining qualified treated liquid. The invention aims to reduce laboratory wastewater radionuclides, namely uranium, thorium, phosphorus and COD (Chemical Oxygen Demand).

The invention discloses a method for recovering uranium and rare earth from superior dissolving slag, which comprises the following steps: step 1, mixing the superior dissolving slag of monazite with a hydrochloric acid solution for acid leaching, and filtering to obtain leached filtrate and a filter cake; 2, sodium chloride is added into the leaching filtrate, so that the chloride ion concentration reaches 140-150 g / L, and an adsorption stock solution is obtained; 3, the adsorption stock solution is subjected to uranium adsorption operation through strongly basic anion resin until the resin is saturated, and saturated resin and adsorption tail liquid are obtained; 4, the saturated resin is washed, leached, subjected to impurity removal and precipitated, and sodium diuranate is obtained; 5, oxalic acid is added into the adsorption tail liquid to precipitate thorium, and thorium oxalate precipitate and filtrate after thorium precipitation are obtained after solid-liquid separation; and step 6, carrying out rare earth precipitation on part of the filtrate after thorium precipitation in the step 5 to obtain a rare earth product. The invention aims to convert traditional'wastewater 'into valuable resources through internal circulation and recycling.

The present invention discloses a method for extracting uranium from monazite alkali cake. The method comprises the following steps: stirring the monazite alkali cake with water to form a slurry to obtain a mixed slurry 1; then adding concentrated hydrochloric acid to the mixed slurry 1 and stirring the mixture to obtain a leaching slurry; adding a polyethylene glycol aqueous solution to the leaching slurry to remove silicon by flocculation, and filtering to obtain an alkali cake leachate and a filter cake; adding a mixed extractant of trioctyldecyl tertiary amine, tributyl phosphate, and sulfonated kerosene to the alkali cake leachate to extract uranium and iron, thereby obtaining an organic-loaded extract and a raffinate; adding a stripping agent to the organic-loaded extract to obtain a stripping solution and a lean organic phase; adding a sodium hydroxide solution to the stripping solution to control the pH of the stripping solution to 2.5-3, and filtering to obtain iron hydroxide and a filtrate; and adding solid sodium hydroxide to the filtrate to obtain a sodium diuranate precipitate. The present invention aims to improve the uranium extraction rate from monazite.

The application relates to a processing method of monazite acid-dissolved slag, which comprises the following steps: mixing monazite acid-dissolved slag and water, then performing separation, mixing acid-dissolved slag light mud obtained through the separation with a hydrochloric acid solution and a reducing agent, performing acid dissolution, then performing first solid-liquid separation, and obtaining first filtrate; the mass concentration of the hydrochloric acid solution is 15%-25%, the volume of the hydrochloric acid solution is 3m 3 / 1000kg-5m 3 / 1000kg, the mass of the acid-dissolved slag light mud is 1000kg; the first filtrate is mixed with an oxidizing agent to perform oxidation reaction, then the obtained oxidation reaction liquid is mixed with a phosphorus source to perform first precipitation treatment, then second solid-liquid separation is performed, and iron precipitate and second filtrate are obtained; a first pH regulator is used to adjust the pH value of the second filtrate to 3.8-4.2, then hydrogen peroxide is added to perform second precipitation treatment, then third solid-liquid separation is performed, and thorium-uranium precipitate and third filtrate are obtained; the third filtrate is mixed with a rare earth precipitating agent to perform third precipitation treatment, and rare earth precipitate is obtained.

The utility model relates to the technical field of rare earth chloride extraction, in particular to monazite and caustic soda flake stirring equipment, which comprises a stirring tank, a caustic soda flake feed port, a monazite feed port and a discharge port are mounted on the stirring tank, a stirring shaft is rotatably connected in the stirring tank through a driving mechanism, and the stirring shaft is rotatably connected with a motor. A plurality of stirring blades are mounted on the stirring shaft through a plurality of detachable mechanisms, each detachable mechanism comprises a mounting ring, the mounting ring is slidably connected to the stirring shaft, a plurality of stirring blades are fixedly connected to the outer side wall of the mounting ring, and a plurality of penetrating holes are formed in the outer side wall of the mounting ring; a plurality of screw holes are formed in the side wall of the stirring shaft, the detachable mechanism further comprises a plurality of fixing bolts, and the plurality of fixing bolts penetrate through the plurality of penetrating holes respectively and are in threaded connection with the plurality of screw holes. The device has the effects that damaged stirring blades are convenient to replace, and the reaction efficiency of caustic soda flakes and monazite is improved.

The invention discloses a heat exchange module and a monazite ore pulp processing system and method, and relates to the technical field of heat exchange. The heat exchange module comprises a shell and a corrugated tube; a grouting pipe and a grout outlet pipe are inserted into two end plates of the shell respectively, the grouting pipe is communicated with one end of the corrugated pipe, and the grout outlet pipe is communicated with the other end of the corrugated pipe; the corrugated pipe is used for containing and guiding monazite ore pulp and comprises corrugated pipe sections and a C-shaped pipe, wherein the corrugated pipe sections and the C-shaped pipe are fixedly connected in an S shape and communicate with each other. Each corrugated tube section comprises a bottom plate, a side plate and a top plate which are connected in a tubular shape. Before the monazite ore pulp is subjected to filter pressing, the monazite ore pulp is cooled through the heat exchange module, and therefore the problem that a filter press is heated and damaged is avoided. A bottom plate of the corrugated tube section is of a flat-plate-shaped structure and is used for avoiding accumulation of mineral particles in monazite ore pulp; the top plate is of a bent plate structure with the vertical section in a wave shape, namely the top face of an inner cavity of the wave node pipe section is in a wave shape and used for forming turbulent flow when monazite ore pulp flows, reducing formation of laminar flow and improving heat exchange efficiency.

The invention discloses a method for preparing a uranium (IV)-containing monazite ceramic solidified body through solid-phase reduction. The chemical general formula of the uranium (IV)-containing monazite ceramic solidified body is shown in the specification, x is less than or equal to 0.1, Sm / Nd is one or two of Sm and Nd, and Ba / Ca / Sr / Pb is one or more of Ba, Ca, Sr and Pb. According to the method, lanthanide metal powder such as Sm and Nd is selected as a reducing agent, a vacuum solid-phase sintering process is combined, HUO2PO4 is directionally converted into a monazite phase which is single in phase, high in density, good in mechanical stability and excellent in chemical stability, the sintering process adopted by the method is simple and efficient in step, and the method is suitable for industrial production. And the problem of secondary pollution caused by introduction of organic matters in the enrichment separation-ceramic solidification process of high-level radioactive nuclides can be effectively avoided.

The application provides a method for preparing thorium sulfate by using monazite optimal dissolution residue, and relates to the technical field of hydrometallurgy. The monazite optimal dissolution residue is subjected to leaching, and the leaching rates of uranium, thorium and rare earth are high, so that leaching ore slurry is obtained. The leaching ore slurry is mixed with a polyacrylamide solution, and solid-liquid separation is carried out, so that a primary liquid is obtained. The primary liquid is subjected to first solvent extraction, iron is removed at the same time of recovering uranium, and a thorium-containing raffinate is obtained. The thorium-containing raffinate is subjected to second solvent extraction, thorium and rare earth are efficiently separated, and thorium-loaded organic phase and a rare earth-containing raffinate are obtained. The thorium-loaded organic phase is subjected to crystallization back extraction, and thorium sulfate is obtained. The method provided by the application is simple in operation, good in separation effect of uranium, thorium and rare earth, high in product purity, continuous in operation, and suitable for industrial application. The results of examples show that the purity of the thorium sulfate prepared by the application is greater than or equal to 98wt%.

The invention relates to a method for leaching and separating cerium and non-cerium rare earth from monazite, and belongs to the technical field of rare earth metallurgy. The method comprises the following steps: carrying out alkaline leaching reaction on monazite to obtain an alkaline leaching product; the alkaline leaching product comprises alkaline leaching residues containing rare earth elements and alkaline leaching liquid containing phosphorus elements; the alkaline leaching residues are placed in a microwave roasting furnace, microwave roasting is conducted in the oxidizing gas atmosphere, Ce (OH) 3 in the alkaline leaching residues is converted into CeO2, and a mineral phase conversion product is obtained; carrying out acid leaching reaction on the ore phase conversion product to obtain an acid leaching product; the acid leaching products comprise acid leaching liquid containing non-cerium rare earth elements and acid leaching residues containing cerium elements. Clean separation of cerium and non-cerium rare earth elements in monazite is achieved, accurate extraction of high-value rare earth elements (such as praseodymium and neodymium) is facilitated, and the comprehensive utilization efficiency of monazite resources is improved.

The present application relates to a kind of mineral material composite cobalt-based catalyst, preparation method and its application.The mineral material composite cobalt-based catalyst includes mineral material and cobalt, mineral material is selected from one or more than two combinations of malachite, monazite, manganese ore, mullite, attapulgite, copper ore, iron ore and ilmenite, and the content of cobalt is 25~75% by mass of element, the valence of cobalt is mainly metal oxide, the ratio of Co 3+ / Co 2+ In metal oxide is 0.2~0.8.The mineral material composite cobalt-based catalyst of the present application is simple in preparation method, low in cost, can effectively catalyze oxidation of low-carbon alkane organic volatile matter, and still can maintain higher low-carbon alkane conversion rate under water vapor condition.

The invention relates to the technical field of rare earth chloride extraction, in particular to monazite dull polishing equipment which comprises a base, a ball mill is mounted on the base and comprises a machine body and a power assembly, the machine body is rotationally connected to the base through the power assembly, end covers are mounted at the two ends of the machine body, and the end covers are arranged on the machine body. A lining plate is mounted in the machine body through fixing bolts and fixing nuts, an auxiliary mounting mechanism is further mounted on the base and comprises a lifting assembly, a forward assembly is mounted on the lifting assembly, an abutting assembly is mounted on the forward assembly, two mounting plates are mounted on the abutting assembly, and the two mounting plates are mounted on the base. And clamping assemblies are mounted on the two mounting plates. The device has the effects of improving the mounting efficiency of the lining plate of the ball mill and improving the operation safety.

The invention discloses a method for extracting prenuclide and preparing medical alpha isotope on a large scale based on monazite discharged waste slag. According to the method, high-value conversion of radioactive waste is realized by comprehensively utilizing the monazite waste slag. The alpha isotope is used as a core raw material for extracting preposed nuclide, so that the environmental harm of radioactive waste residues is reduced, waste is turned into wealth, and a stable raw material source is provided for preparing the medical alpha isotope. A complete technical chain for extracting the medical alpha isotope 225Ac / 212Pb from the monazite waste slag containing 226Ra and 228Ra is constructed, and efficient output of high-value nuclides is achieved. 226Ra and 228Ra in the discharged waste slag are obtained through a step-by-step extraction process flow of a coarse radium product and a fine radium product, a radium target of an ECANS device is manufactured, and hot medical alpha isotopes such as 225Ac, 212Pb and the like can be prepared on a large scale by utilizing a photo-nuclear reaction. According to the preparation mode, the utilization rate of the discharged waste slag is increased, and the requirement of radioactive diagnosis and treatment on the medical alpha isotope can be met.