37 results about "Fluoride products" patented technology

The invention discloses an anhydrous high-purity rare earth fluoride and a preparation method thereof. The anhydrous high-purity rare earth fluoride mainly comprises minim non-rare earth impurity iron (Fe2O3<=1ppm), calcium (CaO<=10ppm), silicon (SiO2<=10ppm), carbon (C<=200ppm), oxygen (O<=200ppm), chloride (Cl<=30ppm), sulfur (S<=10ppm) and the like and has ignition loss not more than 0.5%. Theproduct is mainly applied in the field of electronic and luminescent materials. The preparation method is characterized by pre-removing the non-rare earth impurity by enhancement on the basis of the traditional process and then carrying out conversion in the form of compound fluorinating agents; strictly controlling the feed liquor concentration and acidity, fluorinating agent addition, fluorination temperature and time, etc and obtaining the rare-earth fluoride which is coarse in fluorinated particles, fast in sedimentation and easy to wash and filter; and finally obtaining the anhydrous high-purity rare earth fluoride product through subsequent drying and particle integration.

The invention discloses a method for producing rare earth fluoride from bastnasite. The method comprises the following steps that 1, bastnasite is burnt, decarburized and oxidized; 2, the burnt, decarburized and oxidized bastnasite is added into a hydrochloric acid water solution with a complexing agent for acid leaching; 3, after acid leaching, a flocculating agent is added for solid-liquid separation, a fluorine-containing rare earth material and leached residue are obtained, and the leached residue is washed and recycled; 4, the fluorine-containing rare earth material is heated to be boiled and kept warm, standing is carried out after the reaction is finished, solid-liquid separation is carried out after clarification, and a fluorinated rare earth solid phase and a rare earth chloride clear liquid phase are obtained; and 5, the fluorinated rare earth solid phase is washed till pH is 6-7, heating and dehydration are carried out after filtration, and therefore rare earth fluoride is obtained. Rare earth ore is decomposed, the rare earth fluoride product is obtained, the leaching rate of rare earth in the rare earth ore is larger than 94%, and the utilization rate of fluorine resources in rare earth ore is larger than 91%. Fluorine resources in rare earth ore concentrate are sufficiently utilized, rare earth fluoride is produced, and a remarkable effect is obtained in the aspects of cost, energy saving and consumption reducing, environmental protection and the like.

The invention discloses a hamartite smelting separation process. First optimal slag or / and second optimal slag mainly containing cerium (IV), thorium (IV) and fluorine, obtained by oxidative roasted salt acid leaching of hamartite, is / are used as raw materials, and extraction and separation of rare earth are performed. The process comprises the following steps of: 1) leaching the first optimal slag by using sulfuric acid to obtain sulfuric acid-rare earth solution and filter residue; or leaching the second optimal slag obtained by alkali conversion-hydrochloric acid dissolution of the first optimal slag by using sulfuric acid to obtain sulfuric acid-rare earth solution and filter residue; or leaching the mixed slag of the first optimal slag and the second optimal slag by using sulfuric acid to obtain sulfuric acid-rare earth solution and filter residue; 2) performing extraction separation on the sulfuric acid-rare earth solution obtained in the step 1) to obtain a rare earth compound,fluorine washing liquor, a pure cerium product and a thorium product; and 3) synthesizing a fluoride product by using the fluorine-containing alkali wastewater obtained by alkali conversion in the step 1) and the fluorine washing liquor obtained by the extraction separation in the step 2). The process has the advantages that: the recovery rate of the rare earth is obviously improved, the fluorineand the thorium (IV) are effectively reclaimed in a product form, the high-purity cerium product is obtained, reclamation of the rare earth and associated resources is realized, and the additional values of the resources are improved; and the process flow is simple, the consumption of acid and alkali is low, the production cost is low, and the process is environmentally-friendly.

The invention is the testing method of the alumina in Al fluoride and relates to the chemical analyzing and testing technology, especially the testing of alumina content in Al fluoride products. The invention comprises the collocation of the reagent, the black test, the refining of the samples, the measurement of the samples, the dissolving of the samples, the abstersion of the deposits, the burning condition of the deposits, the cooling of the deposits and the metage process. The invention can fast and precisely test the alumina content in Al fluoride and can accelerate the speed by 5 times and lower the cost by 80% and the analyzing error by 60%.

The invention relates to a technology capable of recycling fluorine and zinc from steelmaking soot. Two-segment acid leaching is adopted for enabling zinc, fluorine and iron in the steelmaking soot to be dissolved in a solution, and then a precipitation method is adopted for enabling harmful element fluorine in the solution to be separated from the solution; and defluorination filtering liquid enters a zinc smelting system, and according to the normal technology, electrolytic zinc is produced. Fluorine-contained precipitation is washed, filtered and dried, and then a fluoride product is obtained. after the technological treatment is carried out, the zinc in the steelmaking soot can be recycled in a manner of a product of excellent cathode zinc, the harmful element fluorine is comprehensively utilized in a manner of an auxiliary product, and the environment pollution caused in the long-term stacking and storing or take-out transportation process of the soot in the steelmaking industry can be eliminated.

The invention belongs to the technical field of polysilicon production, in particular to a method for comprehensively utilizing a chemical byproduct single cryolite during production of polysilicon. The method comprises the following steps of: reacting the single cryolite with sodium hydroxide solution to generate hydrogen and sodium aluminate slurry; and reacting the sodium aluminate slurry withhydrofluoric acid to prepare cryolite for aluminum, wherein the byproduct, namely hydrogen in the reaction process is purified and recovered to serve as a byproduct; and mother liquid is used for producing other fluoride products, or being neutralized by adding lime and then being discharged. The byproduct, namely single cryolite, of polysilicon is used for producing cryolite for aluminum, so rawmaterials are readily available, cost is low and the utilization ratio of the raw materials is high; the produced cryolite for aluminum has low impurity content and meets national standard; and wasteis changed into treasure, which accords with production ideas of comprehensive utilization of resources, energy conservation and environmental protection.

The invention discloses a method for preparing high-purity calcium fluoride and calcium chloride by using fluorine-chlorine mixed acid separated from polluted acid, which comprises the following steps: (1) adding fluorine-chlorine mixed acid to a neutralizer to carry out a stage of neutralization , control the pH value of one section of neutralization end point to 1.5-3, obtain a section of neutralization slag and a section of neutralization filtrate through solid-liquid separation; (2) mix a section of neutralization slag and water to obtain an aqueous solution, then add a flocculant to settle and filter to obtain a high Pure calcium fluoride product and cleaning solution; (3) Collect the mixed solution obtained from the first-stage neutralization filtrate and cleaning solution, add a neutralizer to carry out second-stage neutralization and deep defluorination, and separate solid-liquid to obtain calcium chloride-rich solution and second-stage neutralization solution. and slag; (4) the calcium chloride-rich solution is subjected to cyclic evaporation crystallization and solid-liquid separation to obtain a high-purity calcium chloride product. The invention can recycle the fluorine-chloride mixed acid separated from the polluted acid step by step, and the obtained high-purity calcium fluoride has a purity of ≥99%, and the high-purity calcium chloride has a purity of ≥99%, both of which meet the national Class I standard.