9 results about "Monazite" patented technology

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 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 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 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.

This invention discloses a ferrophosphate-based high-entropy glass-ceramic containing a high-entropy monazite phase and its preparation method, used for simultaneously solidifying multiple (minor)actinide nuclides in high-level radioactive waste (HLW). This invention uses five or more simulated (minor) actinide nuclides in equal amounts. Ln ( Ln =La, Ce, Nd, Sm, Eu, Gd, Dy, Ho, Er) simultaneously dissolve into the ceramic crystalline phase, forming a high-entropy monazite phase ( Ln 1 / n )PO4(5≤ n ≤7). The chemical formula of the solidified body is (100- x ()( y Fe2O3-(90- y (P₂O₅-10B₂O₃)-0.5 x P2O5−( x / 2 n ()( Ln 2O3)(mol%), x =0~30mol% y =15~35mol%. The raw materials are mixed according to the formula and then subjected to a one-step melt heat treatment method (melting, nucleation, crystallization) to obtain a solidified iron phosphate-based high-entropy glass-ceramic.

The application provides a method for improving the solid-liquid separation efficiency of hydrochloric acid leaching slurry of monazite optimal leaching residue, and belongs to the technical field of hydrometallurgy. The method uses a high molecular polymer as a filter aid, directly adds the filter aid into the slurry after hydrochloric acid leaching of the monazite optimal leaching residue, and improves the solid-liquid separation efficiency of the slurry by improving the filtration performance of the slurry. The method does not have additional requirements for the filtration temperature of the slurry, and the filter aid can be mixed with the slurry and then pumped into a filter press for solid-liquid separation treatment. The filtration speed of the slurry can be easily increased to 100L / (m 2 ·h) or above. The method for adding the filter aid has no side effects, does not produce additional precipitation, does not affect the separation and recovery of valuable elements in the leaching liquid, has no aging waiting time, has simple and continuous process operation, effectively reduces equipment investment and energy power consumption, is low-carbon and environmentally friendly, reduces the production cost of enterprises, and is beneficial to large-scale industrial application.

This invention discloses a rare earth concentrate pretreatment method and its application for improving the recovery rate of rare earth ferrosilicon alloy smelting, belonging to the field of rare earth metallurgy. Addressing the problem of low rare earth recovery rates in silicothermic smelting (traditionally only around 65%), this invention employs a "pre-melting-nucleation" synergistic pretreatment: the rare earth concentrate is mixed with a boron-containing flux and a calcium-containing nucleation inducer, and pre-melted at 1200-1350℃ for 30-60 minutes to destroy stable phases such as bastnaesite and monazite in the original ore, forming amorphous or microcrystalline active precursors; then it is crushed to 5-30 mm and smelted with ferrosilicon and lime using the conventional silicothermic process. This invention improves the activity of rare earth oxides through phase reconstruction, while the nucleation inducer promotes the aggregation and sedimentation of alloy microdroplets. After pretreatment using this invention, the rare earth recovery rate is increased to 85%-92%, an improvement of 15-25 percentage points compared to traditional processes, power consumption is reduced by more than 20%, smelting time is shortened by 30%, and resource utilization is significantly improved.

The present invention relates to a method for the preparation of mixed rare earth metal carbonates from monazite, this method comprising a first leaching with an alkaline hydroxide and a two-step second leaching in the presence of hydrochloric acid.