225 results about "Crystal transformation" patented technology

The invention discloses a method for preparing high-quality iron phosphate in a short process, and belongs to the field of battery material manufacturing. The method comprises the following steps: dissolving iron powder with phosphoric acid to prepare a ferrous phosphate solution, then transferring the solution into a pressurized reaction kettle, blowing high-speed oxygen to oxidize ferrous phosphate into ferric phosphate, adding ammonia water to control the pH value to be 1.5-2.0, and carrying out solid-liquid separation to obtain the water-containing amorphous ferric phosphate, after washing is finished, a water-containing material is fed into a muffle furnace to be subjected to stepped calcination, dehydration and crystal transformation are completed, and the alpha monoclinic system iron phosphate is obtained. The method provided by the invention is short in process flow and low in energy consumption, the oxidant is easy to obtain and safe, the particle size uniformity of reaction materials is good, and the prepared iron phosphate is uniform in particle size, regular in structure and stable in iron-phosphorus ratio and is a high-quality precursor material.

The invention provides a preparation method of a ferroelectric film. The preparation method comprises the following steps: providing a first stress layer; depositing a hafnium elementary substance and a zirconium elementary substance on the first stress layer through a magnetron sputtering process to form a ferroelectric alloy layer; the ferroelectric alloy layer is oxidized, crystal defects and crystal phase transformation stress are generated in the ferroelectric alloy layer through heat released in the oxidation process, and a ferroelectric oxidation layer is formed; performing graphical processing on the ferroelectric oxide layer, and depositing a stress material in a graphical processing area of the ferroelectric oxide layer to form a second stress layer; and carrying out rapid thermal annealing treatment on a composite layer formed by the first stress layer, the ferroelectric alloy layer and the second stress layer to promote the crystalline phase of the ferroelectric alloy layer to be converted into a ferroelectric orthogonal phase so as to obtain the ferroelectric film. The invention also provides an application of the preparation method in a microelectronic device.

The invention discloses a low-water-solubility medicine crystal as well as a preparation method and application thereof. The compound Z pamoate crystal form I has large characteristic diffraction peaks at one or more positions with diffraction angles 2 theta of 9.9 + / -0.2 degrees, 10.7 + / -0.2 degrees, 12.1 + / -0.2 degrees, 14.9 + / -0.2 degrees, 17.3 + / -0.2 degrees, 19.4 + / -0.2 degrees, 20.7 + / -0.2 degrees and 23.1 + / -0.2 degrees. Compared with an amorphous compound Z pamoate, the crystal provided by the invention has the advantages of good stability, no crystal transformation phenomenon, no obvious increase of related substances and low solubility; the production process is simple, only water is used as a solvent in the whole process, and no organic solvent is used; when the long-acting slow-release anti-Parkinson medicine composition is prepared from the compound Z pamoate crystal form I, the medicine encapsulation efficiency is high, the burst release is low, the composition continuously releases the medicine in vivo for more than 2 weeks, the administration frequency of a patient can be reduced, and the medication compliance is improved.

The invention relates to the technical field of iron phosphate preparation, in particular to a preparation method of low-impurity iron phosphate with a high iron-phosphorus ratio, which at least comprises the following steps: preparing an iron source solution and a phosphorus source solution; mixing an oxidizing agent and a phosphorus source solution as a phosphorus source mixed solution; adding the phosphorus source mixed solution into the iron source solution, and controlling the molar ratio of iron to phosphorus to be 1: (1.1-1.3) to prepare slurry; dividing the slurry into two parts, respectively adding an impurity removal agent, and then carrying out segmented aging at 90 DEG C to prepare crystallized slurry; and filtering, washing, drying and calcining the crystallized slurry to obtain a target product iron phosphate finished product. The impurity removal agent is selected from one or more of ferrous sulfate, ferrous chloride, ferrous nitrate and ferrous oxalate. Seed crystals are formed through segmented aging crystal transformation to promote crystal growth, and autonomous grain size distribution is achieved; an impurity removing agent is added in the aging stage, impurities are reduced by using the same ion effect, the iron-phosphorus ratio is increased, and the compaction density and the electrical property of the prepared lithium iron phosphate are remarkably improved.

The invention discloses a method for preparing anhydrite through ultrasound-assisted phosphogypsum crystal transformation, which is characterized in that phosphogypsum is used as a raw material, ammonium persulfate is used as an additive, a dilute sulfuric acid solution is used as a crystal transformation agent, and the anhydrite is prepared by adopting a sulfuric acid method under ultrasound-assisted action. The process for preparing the anhydrous gypsum has the characteristics of low sulfuric acid concentration, low equipment corrosion degree, low heating temperature, low energy consumption, high whiteness of the product anhydrous gypsum and small particle size.

The invention discloses a preparation method of a high-specific-power manganese dioxide-carbon fluoride battery positive pole piece. The preparation method comprises the following steps: (1) carrying out high-temperature heat treatment on electrolytic manganese dioxide to finish crystal transformation of the electrolytic manganese dioxide; (2) carrying out ball milling on the manganese dioxide, the carbon fluoride and the conductive agent which are subjected to heat treatment to obtain a composite substance of the manganese dioxide, the carbon fluoride and the conductive agent; (3) stirring and mixing the composite substance with a binder, a surfactant and deionized water to form manganese dioxide-carbon fluoride battery positive electrode slurry; and (4) coating the prepared positive electrode slurry on an aluminum mesh with a certain surface density in an extrusion or roller coating manner, and carrying out drying and rolling processes to obtain the high-loading-amount manganese dioxide-carbon fluoride battery positive electrode plate with a certain compaction density and surface density. The prepared positive pole piece has relatively high conductivity and energy density, and the high-magnification application scene of the lithium manganese dioxide-carbon fluoride battery is further widened.

The invention belongs to the technical field of molecular sieve synthesis, and discloses a preparation method for crystal transformation synthesis of an ANA type molecular sieve. The preparation method comprises the following steps: mixing an inorganic alkali solution with a Y-type molecular sieve, and crystallizing; and sequentially drying and grinding the crystallized product to obtain the ANA type molecular sieve. Through the key guiding effect provided by Na < + > ions in the molecular sieve crystal transformation process, template-free synthesis of the ANA type molecular sieve is realized, and dependence of ANA type molecular sieve synthesis on an organic template agent is eliminated. Besides, the Y-type molecular sieve is used as a silicon-aluminum source, so that the cost is reduced, the production efficiency is improved, the environmental pollution is reduced, and favorable conditions are provided for large-scale production of the ANA type molecular sieve. The prepared ANA type molecular sieve has the advantages of high purity, good crystallinity and price, and fully meets the market demand.

The invention discloses a clindamycin phosphate crystallization tracing method and system based on a block chain, and belongs to the technical field of medicine manufacturing process control. The method comprises the following steps: collecting multi-modal data of a crystallization process in real time through a Raman spectrum sensor, an FBRM sensor and other process analysis technology sensors; constructing a dynamic space-time atlas based on the data to characterize a process state; deeply analyzing the map by using a time-space diagram neural network model so as to identify key crystallization events such as nucleation and crystal transformation; the AI oracle machine automatically generates an event certificate containing event details, an original data hash value and a digital signature for the identified CCE; and finally, submitting the certificate as a transaction to a block chain network for uplink evidence storage, and forming a tamper-resistant tracing record. According to the method, the AI and block chain technologies are fused, so that the problem that key microscopic events are lack of credible and non-tampering records in the crystallization process is solved, and a high-fidelity tracing record with cryptographic guarantee is provided for the pharmaceutical production process.

The invention discloses a method for preparing fine-grain copper and copper alloy through pulsed magnetic field and rare earth adding composite regulation and control, and belongs to the technical field of copper and copper alloy material preparation. Graphite mold casting is adopted in the method, and the method comprises the specific steps that electrolytic copper with the purity larger than or equal to 99.95 wt% or a copper alloy with specific components is prepared as a matrix raw material; after smelting, adding pure lanthanum blocks and uniformly stirring; after the melt is poured into a preheating mold, a pulsed magnetic field is applied immediately for treatment, and the parameters of the magnetic field are as follows: the pulse voltage is 180-250 V, the frequency is 4.5-6.5 Hz, and the duration time is 15-20 minutes. According to the method, the heterogeneous nucleation effect of rare earth lanthanum is combined with the melt forced convection and dendritic crystal crushing effect caused by the pulsed magnetic field to synergistically refine a solidification structure and promote columnar crystal orientation equiaxed crystal transformation, so that a cast ingot with fine crystal grains is directly obtained in the casting stage, and the possibility is provided for simplifying the subsequent processing technology.

The invention relates to the field of iron phosphate preparation, in particular to heterogeneous doped iron phosphate, a preparation method thereof and heterogeneous doped lithium iron phosphate, and the preparation method of the heterogeneous doped iron phosphate comprises the following steps: S1, preparing a titanium-containing iron source solution and a phosphorus source solution; s2, mixing and reacting the iron source solution, the phosphorus source solution and an oxidizing agent to prepare titanium-doped amorphous iron phosphate; s3, aging and crystal transformation are conducted on the titanium-doped amorphous iron phosphate, and titanium-doped iron phosphate dihydrate is prepared; s4, uniformly adding a secondary doping aid into the titanium-doped iron phosphate dihydrate to form secondary doped iron phosphate dihydrate; the secondary doping aid contains at least one element of titanium, vanadium or niobium; and S5, dehydrating and drying the secondary doped iron phosphate dihydrate, and then carrying out high-temperature calcination to form the heterogeneous doped iron phosphate. The whole process is simple and controllable in technological process, stable in quality, low in cost and easy to industrially popularize, and the prepared lithium iron phosphate material is excellent in gram volume and rate capability and wide in application field.

The invention belongs to the field of inorganic non-metallic materials, and particularly relates to a method for preparing a strongly acidic Al-MCM-41-T mesoporous catalyst from an MWW layered molecular sieve precursor through a crystal transformation method and application of the strongly acidic Al-MCM-41-T mesoporous catalyst. Specifically, an aluminum-containing MWW layered molecular sieve precursor (namely MCM-22 (P)) is used as a raw material, and the Al-MCM-41-T catalyst which is large in surface area, high in framework aluminum content and strong in acidity is prepared through a crystal transformation method. The obtained mesoporous material is used for the liquid phase alkylation reaction process of lignin-derived phenols and cyclic alcohols / cycloolefins. The Al-MCM-41-T synthesized by the method has a high specific surface area (more than 1000m < 2 > g <-1 >), a high pore volume (more than 1.4 cm < 3 > g <-1 >) and a regular and concentrated mesoporous structure (2-4nm), meanwhile, the content of framework aluminum is high, and the total Bronsted acid concentration, especially the strong Bronsted acid concentration, is high and far exceeds that of an Al-MCM-41-C material prepared by a conventional hydrothermal method. The catalyst shows excellent activity and polyalkyl product selectivity in an acid-catalyzed liquid-phase alkylation reaction.

The present application provides a low-impurity high-specific-surface-area iron phosphate and its preparation method and application, which belongs to the field of lithium battery materials. The preparation method of the low-impurity high-specific-surface-area iron phosphate provided by the present application includes: providing a ferrous salt solution and a mixed solution containing an oxidant and a phosphorus source; mixing the ferrous salt solution with the mixed solution, and performing a precipitation reaction to obtain a reaction slurry; introducing an oxidizing gas into the reaction slurry, and then heating and aging to obtain a hydrated iron phosphate slurry; after solid-liquid separation, washing, drying and sintering of the hydrated iron phosphate slurry, a low-impurity high-specific-surface-area iron phosphate is obtained. In the above process of iron phosphate crystal transformation, under the oxidation action of the oxidizing gas, a trace amount of trivalent iron ions is always present in the system to inhibit the formation of other impurity phosphate precipitations, and at the same time, through the pore-forming action of the oxidizing gas, the microscopic morphology of the prepared iron phosphate is a porous structure, thereby preparing a low-impurity high-specific-surface-area iron phosphate.

The invention discloses a ferromanganese phosphate precursor as well as a preparation method and application thereof, and relates to the technical field of battery materials. The method comprises the following steps: respectively preparing a manganous dihydrogen phosphate solution and a ferric sulfate solution; phosphoric acid, an oxidizing agent and a ferric sulfate solution are added into the manganese dihydrogen phosphate solution at the same time, or the manganese dihydrogen phosphate solution, phosphoric acid and the oxidizing agent are added into the ferric sulfate solution at the same time, the oxidizing agent is used for oxidizing manganese dihydrogen phosphate into manganese phosphate, ferric sulfate and phosphoric acid form ferric phosphate, and ferromanganese phosphate mixed slurry is obtained; aging the ferromanganese phosphate mixed slurry for crystal transformation, carrying out solid-liquid separation, and washing to obtain a ferromanganese phosphate filter cake; the ferromanganese phosphate filter cake is dried, calcined and smashed, a ferromanganese phosphate precursor is obtained, the chemical formula of the ferromanganese phosphate precursor is FexMn (1-x) PO4, and x ranges from 0.2 to 0.3. According to the method, a structure in which iron phosphate and manganese phosphate are mutually coated can be formed, and the hidden danger that the electrochemical performance of the lithium manganese iron phosphate positive electrode material is reduced due to non-uniform distribution of manganese and iron can be reduced.

A crystal form of Lunresertib (also referred to as RP-6306), and a preparation method therefor and the use thereof. The crystal form has at least one of the following excellent characteristics: good stability, high purity, good solubility, good dissolution, low hygroscopicity, good fluidity, good processibility, for example, good compressibility, more stable pressed tablets, good crystal morphology and good pressure resistance, and can be stably stored and prevent the drug from undergoing crystal transformation during the development process and storage, and the preparation method is simple and reliable. Therefore, the crystal form has a high development value.

The invention provides a spherical molecular sieve desiccant which comprises 95.0-98.5% by mass of an A-type molecular sieve and 1.5-5.0% by mass of a matrix, the A-type molecular sieve is composed of a non-crystal transformation A-type molecular sieve and a crystal transformation generated A-type molecular sieve, more than 50% of cations of the A-type molecular sieve are occupied by potassium ions, the particle diameter of the desiccant is 1.0-1.4 mm, the dynamic water adsorption capacity is greater than or equal to 22.0%, and the particle size of the desiccant is 0.2-0.5 mm. The drying agent is high in static and dynamic water adsorption capacity, good in strength and large in burning bulk density.

The invention relates to the technical field of medicinal chemistry, discloses an oral pharmaceutical composition containing active ingredients of a CDK4 / 6 and DYRK2 double-target inhibitor and a preparation method, and adopts a dry granulation process to prepare the oral pharmaceutical composition containing the active ingredients of the CDK4 / 6 and DYRK2 double-target inhibitor. In the preparation process, the composition is not in contact with water and other reagents, no heating step exists, and the problems that active ingredients are poor in mobility and prone to crystal transformation are solved. The invention not only can effectively solve the problem of low bulk density, but also can ensure the stability, uniformity and production feasibility of the dosage form.

The invention relates to a method for recycling valuable resources from a waste lithium iron phosphate material, and belongs to the technical field of recycling of waste lithium iron phosphate batteries. The method comprises the following steps: dispersing a waste lithium iron phosphate material in water to obtain a mixture I; respectively adding an acid solution and an oxidant solution into the mixture I at the same time to carry out leaching reaction, and carrying out solid-liquid separation to obtain a leaching solution A and active ferrophosphorus slag; iron powder and the leachate A are subjected to a replacement reaction to recover copper in the leachate A, and copper sponge and lithium-rich leachate are obtained; and calcining the active ferrophosphorus slag for crystal transformation to obtain decarbonized ferrophosphorus slag, the decarburized ferrophosphorus slag is mixed with alkali liquor, the mixture is placed in a mill to be subjected to ball-milling leaching, and leachate B and ferric hydroxide are obtained; and adjusting the pH value of the leachate B to be alkaline to obtain an aluminum hydroxide and phosphate solution. The method provided by the invention is simple to operate and low in cost, has good economic benefits and is easy for industrial application.

The invention discloses a polymer additive, a flame retardant, a polymer molding material and a preparation method and application thereof. The polymer additive is prepared from aluminum diethyl phosphinate and aluminum ethyl butyl phosphinate; the polymer additive satisfies a double enthalpy ratio [Delta] H defined by the following formula (1): 0.90 < = [Delta] H < = 1.05; 135 DEG C < = T1 < = 160 DEG C, 165 DEG C < = T2 < = 185 DEG C, and 180 DEG C < = T3 < = 200 DEG C; formula (1): [Delta] H = (H2 + H3) / H1. The polymer additive provided by the invention has a specific crystal transformation state, and the polymer molding material added with the polymer additive has a lower molding shrinkage rate in a molding application process.

The invention relates to the technical field of battery materials, in particular to a Br-doped Y / Zr-based sulfide solid electrolyte and a preparation method and application thereof.The chemical formula of the Br-doped Y / Zr-based sulfide solid electrolyte is shown as the formula (I): Lia (YxZr1-x) bClcBrySd, wherein 0.5 < = (a + b) / (c + d) < = 1; gt; 0, bgt; 0, cgt; 0, dgt; 0; 0 lt; xlt; 1; 0 lt; and y < = c. According to the invention, by introducing Br <->, the lattice volume is expanded, the interstitial space in the crystal is improved, and the transmission path of Li < + > is expanded, so that the Li < + > migration energy barrier is reduced, and the conductivity of the solid electrolyte can be improved to a certain extent; a synergistic effect can be achieved through Y / Zr, so that an originally compact lattice framework is slightly expanded, and a smoother conduction path is constructed for ions Li < + >; on the other hand, crystal transformation of Zr can be inhibited through Y, the interface stability is improved, and finally the solid electrolyte has high conductivity and high interface stability.

The invention discloses a method for precipitating iron through ultrasonic enhanced oxidation, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: performing ultrasonic treatment on a mixed system of an iron-containing zinc sulfate solution and an oxidizing agent under an acidic condition, efficiently catalyzing ferrous ions (Fe < 2 + >) to be oxidized into ferric ions (Fe < 3 + >) by utilizing an ultrasonic cavitation effect, and promoting the ferric ions to be stably precipitated in a goethite (alpha-FeOOH) form; after the reaction is completed, carrying out solid-liquid separation to obtain a low-iron zinc sulfate solution and goethite slag; compared with a traditional jarosite method and a hematite method, the method has the advantages that exogenous cations such as potassium and sodium do not need to be introduced, a high-temperature and high-pressure environment is not needed, and the oxidation efficiency can be remarkably improved and the goethite crystal form conversion can be regulated and controlled only based on the ultrasonic cavitation effect, so that the consumption of an oxidizing agent and the zinc content in the slag are effectively reduced; meanwhile, the iron grade and the filtering performance of an iron precipitation product are improved; the method is suitable for various oxidants, is high in process adaptability, has the advantages of high efficiency, greenness and economy, and has wide popularization and application prospects in the field of zinc smelting.

The invention discloses a preparation method of a maltol iron crystal form II. The invention provides a preparation method of an iron maltol crystal form II, which comprises the following steps: mixing a dichloromethane solution of iron maltol with water, and distilling to remove dichloromethane to obtain the iron maltol crystal form II. According to the method disclosed by the invention, the crystal form II can be obtained without crystal transformation or seed crystal addition, the operation is simple, the yield is high, and the method is suitable for industrial mass production.

The utility model relates to the technical field of gas heating, and discloses a heat source structure and a fluidization crystal transformation device. The heat source structure comprises a pipeline which is provided with a channel penetrating in the axial direction of the pipeline, and the channel is used for gas to pass through; the heating assembly is used for heating the pipeline; wherein the channel is internally provided with filler, the filler is provided with a gap, and gas can be discharged from the gas outlet of the channel through the gap. The fluidization crystal transformation device comprises a furnace body and a heat source structure. According to the technical scheme, the technical problem of high energy consumption of a device for preparing anhydrous iron phosphate in the prior art can be solved.

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.

The utility model relates to a titanium dioxide zero-carbon suspension rapid crystal transformation system which comprises a desulfurizing tower, an induced draft fan, a bag collector, a scattering dryer, a high-temperature fan, a first cyclone cylinder, a suspension calcining furnace and a second cyclone cylinder. According to the utility model, titanium dioxide is produced by adopting a suspension calcination technology, green electricity is adopted as electric energy, and a byproduct carbon dioxide is recycled, so that zero-carbon production of products is facilitated, and carbon neutralization in the titanium dioxide industry is promoted.

The invention belongs to the technical field of preparation of adsorption materials, and relates to a 13X molecular sieve adsorbent for removing CO2 as well as a preparation method and application of the 13X molecular sieve adsorbent. The preparation method comprises the following steps: firstly, soaking clay powder in an acid solution, and carrying out filter pressing to obtain a clay filter cake; then, mixing the high-silica-alumina-ratio 13X molecular sieve, the clay filter cake and a pore-forming agent, granulating and forming, and drying and roasting to obtain the spherical high-silica-alumina-ratio 13X molecular sieve adsorbent with the particle size of 1.6-2.4 mm, and finally, treating the 13X molecular sieve adsorbent with the high silica-alumina ratio in a caustic alkali solution, washing, drying and roasting to obtain the efficient 13X molecular sieve adsorbent for removing CO2. According to the method, one-step aluminizing-directional crystal transformation is realized, and the prepared 13X molecular sieve adsorbent has higher CO2 adsorption capacity and is suitable for efficient removal of trace CO2 in air separation.

The invention discloses a bird nest type hydrogenation protective agent for a coal-to-oil system as well as a preparation method and application of the bird nest type hydrogenation protective agent, and belongs to the technical field of catalyst protection. The preparation method of the protective agent comprises the following steps: kneading pseudo-boehmite, a binder and a special molecular sieve, then adding an acid solution, polyvinyl alcohol and glycerol, and carrying out wet kneading to obtain mud; after wet kneading is finished, sequentially carrying out vacuum pugging, aging, extrusion molding by adopting a bird nest type mold, pelletizing and roasting to obtain a protective agent carrier; and loading an active metal component on the obtained protective agent carrier, and sintering to obtain the protective agent. According to the protective agent, the pseudo-boehmite with high crystallinity and high pore volume and the special molecular sieve are cooperatively used, and through shaping and roasting crystal transformation, the protective agent has the advantages of high radial strength, high water absorption capacity, high polar oxide adsorption capacity and high deoxidization capacity, and oxygen-containing compounds in coal-to-oil heavy oil can be effectively removed; the service life of the main catalyst is prolonged.

The application provides a method for preparing high-iron-phosphorus-ratio iron phosphate in batches at low cost, and the steps are as follows: S1. reacting a ferrous sulfate solution, a phosphorus salt solution and hydrogen peroxide to obtain amorphous iron phosphate; S2. filtering and washing the amorphous iron phosphate; S3. adding pure water to the filtered cake of the washed amorphous iron phosphate, stirring, heating, adding a crystal transformation promoter after keeping warm, and reacting to obtain iron phosphate dihydrate slurry, and reserving part of the iron phosphate dihydrate slurry; S4. squeezing, drying and calcining the remaining iron phosphate dihydrate slurry; S5. repeating steps S1-S4 in batches; if it is the first batch reaction, the crystal transformation promoter is phosphoric acid, and if it is not the first batch reaction, the crystal transformation promoter is a mixture of hydrogen peroxide and crystal nuclei prepared from the iron phosphate dihydrate slurry reserved in the last batch. The method can greatly save the preparation cost of iron phosphate, and the iron-phosphorus ratio of the prepared iron phosphate is above 0.99.

The present invention relates to the field of glass preparation technology, and in particular to a highly corrosion-resistant pharmaceutical glass rotating tube and its preparation method, in order to alleviate the problems of poor corrosion resistance of existing mullite rotating tubes and the easy cracking of high-zirconium rotating tubes. This solution effectively locks the Na in the glass liquid by introducing waste borosilicate glass into an alumina (main crystal phase α-Al2O3) matrix with good high-temperature stability. + The added CaO and MgO can promote the conversion of γ-Al2O3 to α-Al2O3 at a lower temperature (α-Al2O3 has better high-temperature stability). At the same time, the formed composite borate CaMgB2O5 can inhibit the growth of ZrO2 grains, stabilize the cubic phase of ZrO2, avoid cracking caused by crystal transformation, and effectively improve the thermal shock resistance, thereby extending the service life of the rotary tube and reducing the adverse effects of the rotary tube on product quality.

The invention provides a treatment method of salt production by-product salt gypsum, which comprises the following steps: S1, carrying out plate-frame pressure filtration on a gypsum mother solution containing salt to obtain brine and a filter cake, and diluting the filter cake with water to obtain a gypsum sub-solution; s2, adding a carrying type crystal modifier into the gypsum sub-liquid obtained in the S1, controlling the temperature to be 35-55 DEG C, the pH value to be 6-8 and the stirring speed to be 180-220 r / min, and promoting crystal transformation to obtain crystal transformation liquid; the carrying type crystal modifier is prepared by carrying sodium sulfate on cross-linked starch; s3, carrying out solid-liquid separation on the crystal transformation liquid obtained in S2 to obtain dihydrate gypsum and a salt-containing aqueous solution; and S4, drying the dihydrate gypsum obtained in S3 to obtain a final product. The salt content of the final product is effectively reduced.

The invention provides a method for preparing anhydrous gypsum through phosphogypsum crystal transformation and purification, and relates to the technical field of industrial solid waste recycling. The method comprises the following steps: uniformly mixing the phosphogypsum, the acidic mixed solution and the crystal modifier, reacting under specific conditions, and filtering while hot after the reaction is finished, thereby obtaining the anhydrous gypsum. According to the technical scheme, the growth process of the anhydrous gypsum is regulated and controlled by introducing the specific crystal modifier, so that the anhydrous gypsum with high purity and high compressive strength is obtained. The method is suitable for preparing the anhydrite by taking the industrial byproduct phosphogypsum with high phosphorus impurity content as the raw material, the produced anhydrite is good in crystallization conversion, excellent in product quality, simple in process, high in efficiency and low in energy consumption, the water demand is lower than that of a traditional method, the phosphogypsum waste can be utilized, and resource circulation is realized.