325 results about "Massicot" patented technology

A bulk single phase glass comprising 23 molar % to 50 molar % rare earth oxides, RE203, and 50 molar % to 77 molar % aluminum oxide, A12O3 is provided. The glass contains at least 50 molar % of Al2O3+RE2O3 and smaller amounts of oxide glass forming agents and other oxides than are found in prior art glasses. The addition of small amounts of lanthanum oxide, La2O3, prevents phase separation. The single phase glass is useful for optical applications such as lasers and optical amplifiers.

The invention discloses a method for recovering precious metal platinum in a car dead catalyst through a pyrogenic process. The method comprises the steps that (1) the car dead catalyst is pretreated,and then the car dead catalyst is sealed for standby application; (2) the car dead catalyst obtained in the step (1) is evenly mixed with a carbon reducing agent, a trapping agent and a slagging material according to a certain percentage to prepare blocky mixtures; (3) the mixtures obtained in the step (2) are broken to be placed into a direct current electric arc furnace for high-temperature smelting to obtain melted liquid; and (4) upper-layer slag liquid of the melted liquid obtained in the step (3) is poured out to prepare glassy state or wee glass balls, and a lower-layer precious metalplatinum containing alloy is naturally cooled at room temperature. The method is suitable for high-grade materials, can be used for recovering precious metal platinum from low-grade materials, the process is simple, and the period is short.

The invention discloses a rich-lithium ternary laminar lithium ion battery cathode material, which has a molecular formula of Li<1+alpha> MnxNiyCozO2, wherein alpha is greater than 0.05 but smaller than 0.5, x is greater than 0.5 but smaller than 0.8, y is greater than 0.05 but smaller than 0.2, z is greater than 0.05 but smaller than 0.2, and the sum of x, y and z is 1. According to a method, a sol-gel method is adopted for preparing the cathode material. The method comprises the following preparation processes that metal salts of soluble manganese sources, nickel sources, cobalt sources and lithium sources are dissolved in water, then, acid complexing agents are added, ammonia water is used for regulating the pH value to be 6 to 8, next, the stirring is carried out at 60 to 90 DEG C, in addition, the water is dried through evaporation, sol-gel precursors are obtained, blocky porous loose precursors are obtained through vacuum drying, then, the ball milling, the pre-sintering, the sintering and the ball milling are carried out, and finally, the cathode material is obtained. The obtained material has the advantages that particles are more uniform and are in the nanometer level, in addition, a battery is assembled for carrying out electrochemical test, and higher capacity and excellent circulation performance are realized.

The invention discloses a method for preparing a magnesium metal and a by-product by vacuum carbothermic reduction with serpentine minerals. The method comprises the following steps: using serpentine mineral powder as a raw material; adding a carbonaceous reducing agent which is 1 to 2 times of the theoretical quantity of carbon required for completely reducing magnesium silicate in the serpentine; adding a catalyst, and mixing the materials evenly to obtain a mixed raw material; pressing the mixed raw material into spherical or blocky ball agglomerations and drying the ball agglomerations; putting the dried ball agglomerations into a vacuum furnace, controlling the vacuum degree in the furnace to between 10 and 500 Pa, raising the temperature to between 500 and 700 DEG C, and keeping the temperature for 20 to 60 minutes to remove crystal water and clinker the materials; keeping the vacuum degree in the furnace, raising the temperature to between 1,200 and 1,500 DEG C, and reducing the magnesium silicate and oxides of metallic iron and nickel at a constant temperature for 30 to 60 minutes; and condensing magnesium vapor obtained from the reduction on a magnesium condenser into crystallized magnesium, recycling the metallic iron and the metallic nickel in the slag through magnetic separation, and preparing the slag after the magnetic separation into industrial silicon carbide through decarburization and purification.

The invention discloses a calcination process of active lime. The calcination process adopts a preheating-suspension calcination device comprising a multi-stage cyclone preheating system, a decomposing furnace and a multi-stage cyclone cooler. The calcination process is characterized in that limestone powder which is broken and homogenized into blocks is ground into fine powder, the fine powder is placed in a storage tank for homogenization, then preheated by the multi-stage cyclone preheating system and sent to the decomposing furnace for calcination, thereby preparing the active lime, and the active lime is further cooled by the multi-stage cyclone cooler for obtaining the active lime; wherein the main control temperature of the decomposing furnace is 850-950 DEG C; and the calcination time is 3-5 seconds. The calcination process utilizes the preheating-suspension calcination reaction method for calcining the active lime, and fuel can use low-grade fuel-biluminous coal. Compared with the traditional process, the calcination time is short, the effective utilization rate of the lime product is high, the product quality is stable, the energy consumption is low, and a production region has no environmental pollution; meanwhile, the calcined active lime is the fine powder, the use is very convenient, and the range of applications is broader in comparison with the active lime calcined by the traditional process, thereby being conductive to promotion and implementation.

The invention discloses an iron making method using direct reduction-grinding screening to treat copper slag and nickel slag, which comprises the following steps: firstly mixing a proper amount of coal, copper slag or nickel slag and a fusing agent to make balls; drying the balls; distributing the green balls in a rotary hearth furnace; heating the green balls to 1,100 to 1,350 DEG C; keeping the temperature for 15 to 40 minutes; directly delivering 600 to 1,100 degree centigrade high temperature reducing iron material into water for cooling; performing fine grinding screening; and drying the fine grinding-screened iron material with high temperature oxygen-losing waste gas and briquetting to form blocky iron materials. The method is simple in process, short in flow, high in efficiency, free from coking coal needs and suitable for treating the copper slag and the nickel slag.

The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of a layered ternary ceramic reinforced copper composite material. According to the preparation method, the reinforced effect of a strengthening phase can be fully exerted and the synergistic effect of a substrate and the strengthening phase are also fully exerted, so that the conductivity of the material is well matched with the strength of the substrate. The preparation method comprises the following steps: (1) carrying out ball-milling and mixing on 2wt%-45wt% of layered ternary metal ceramic powder and remained copper powder in a ball mill; (2) carrying out mould pressing on the mixed powder obtained in the step (1) so as to form a blocky green body; and (3) at the hydrogen or noble gas atmosphere, warming up the blocky green body to 800 DEG C-1250 DEG C at the warming speed rate of 20-40 DEG C / min, insulating for 0.5-3 hours, and cooling so as to obtain the layered ternary ceramic reinforced copper composite material.

The invention relates to a low-toxicity and environmentally friendly gold and silver oredressing additive as well as a preparation method and application thereof. The main raw materials of the additive comprise sodium hydroxide, sodium carbonate, urea and potassium ferrocyanide. The preparation method comprises the following steps of: heating the sodium hydroxide, the sodium carbonate, the urea and the potassium ferrocyanide to 600-1,000 DEG C, and after the materials reach a molten state, continuing to preserve heat for 1-2 hours; directly cooling to normal temperature; and demoulding to obtain a nubby gold and silver oredressing additive. The product of the invention can be widely applied to producing noble metal mines, such as soaking, core spraying, and the like of gold oxide mines, silver oxide mines, copper oxide mines, and also can be used for industrial production industries of electroplating, and the like for replacing highly toxic sodium cyanide chemicals. Compared with other non-toxic sodium cyanide drugs, the additive provided by the invention has the advantages of good effect, stable drug properties, environmental friendliness, lower cost, and the like.

The invention discloses a method for preparing calcium carbide, which comprises the following steps: drying a carbon-base raw material to obtain a dried carbon-base raw material; respectively crushing the dried carbon-base raw material and a calcium-base raw material to obtain a carbon-base powder and a calcium-base powder; mixing the carbon-base powder and calcium-base powder to obtain a mixture; forming the mixture to obtain a lump material; pyrolyzing the lump material to obtain high heating value synthetic gas, tar and a pyrolytic solid product, wherein the pyrolytic solid product contains coke, semicoke, carbon black and quicklime; and feeding the pyrolytic solid product into an arc furnace at the temperature of not lower than 450 DEG C to perform smelting in the arc furnace, thereby obtaining the calcium carbide. The method can obviously lower the smelting energy consumption and production cost, and further enhances the preparation efficiency and quality of the calcium carbide.

The invention discloses a method for preparing iron-based prealloy powder. The method includes the steps that (1) iron-based bulk metal is prepared, the content of Fe is 30wt%-90wt%, the content of Cu is 10wt%-70wt%, and the melting point is no more than 1,800 DEG C; (2) smelting water atomization powder process treatment is conducted on the metal, so that the iron-based prealloy powder is obtained; (3) the treated powder is dried; (4) after drying of the atomization powder is completed, low-melting metal simple substance powder is added, the melting point is no more than 500 DEG C, and the content is no more than 15wt%; (5) the low-melting metal powder and the dried powder are evenly mixed; (6) reduction treatment is carried out on the mixed powder through a reduction furnace, hydrogen flow is controlled to be 20m<3> / h-30m<3> / h, and reduction time is no less than 2h; (7) large particles are sieved and removed to obtain the iron-based prealloy powder. The method is easy to implement and simple and convenient to operate, by the aid of a high-temperature diffusion and evaporation cohesion principle in the reduction process, the content of produced Zn is 2-15% that of the iron-based prealloy powder, and the iron-based prealloy powder has the advantages of being low in oxygen content, simple in preparation mode and good in cold pressing formability.

The invention discloses microwave dielectric ceramic material with ultra-low sintering temperature. The microwave dielectric ceramic material has the molecular structure expression of (Li0.5M0.5)NO4, wherein the M is Sm or Bi, and the N is W or Mo. The method for preparing the microwave dielectric ceramic material comprises the following steps: preparing analytically pure Li2CO3, M2O3 and NO3 which are at the molar ratio of 1:1:4; mixing the prepared chemical raw materials; adding alcohol to the mixture; mixing the alcohol and the mixture with the wet grinding process; drying the mixture; sieving the mixture; briquetting the mixture; putting the mixture in an alumina crucible; heating the mixture to 500-650 DEG C at the speed of 5 DEG C per minute; preserving the heat of the mixture for 4-8h to obtain a baked block; grinding the baked block; grinding the baked block into balls for the second time; granulating to obtain the microwave dielectric ceramic material; and sintering the microwave dielectric ceramic material at 550-850 DEG C for 2-4h. The microwave dielectric ceramic material has simple chemical components and preparation process, low natural sintering temperature, high Q*f and low frequency-temperature coefficient. In addition, the microwave dielectric ceramic material has the dielectric constant of 16-40.

The invention belongs to the technical field of metal material preparation, and particularly relates to a tantalum foam and a preparation method thereof. The porosity of the tantalum foam is between 20 and 80 percent, pores in the tantalum foam are intercommunicated, and the tantalum foam accounts for over 99.9 percent of the weight of the tantalum. The preparation method comprises the following steps: uniformly mixing one of iron powder, iron dust, cobalt powder or nickel powder and tantalum powder or tantalum dust, and pressing the mixture into blocks; then, putting the blocks into a vacuum furnace, sintering the blocks for 0.5 to 2 hours at the temperature of between 1,200 and 1,400 DEG C, then heating the blocks to between 1,500 and 1,800 DEG C and sintering the blocks for 2 to 6 hours, and cooling the blocks to the room temperature; taking the blocks out, soaking the blocks into aqueous solution of hydrochloric acid till the reaction is finished, then washing the blocks by deionized water till the flushing solution is neutral, drying the blocks, finally putting the blocks into the vacuum furnace for sintering, and cooling the blocks to the room temperature. The process method of the invention has the characteristics of simple equipment implementation, easy control of the porosity of the foam metal, easy realization of special shape of the foam metal, low cost and the like.

The invention relates to a method for extracting arsenic metal from arsenic ash by carbon thermal reduction outside a direct current furnace, belonging to the technical field of metallurgy. In the method, arsenic ash or arsenic trioxide is used as a raw material, and nut coke is used as a reducer, wherein the mol ratio of the raw material to the reducer is 1.0:(3.0-5.0). The method comprises the following steps: carrying out first-stage carbon thermal reduction in a closed direct current furnace at 800-1300 DEG C under a pressure of 0-20Pa, thus generating arsenic metal vapor and other flue gas through reduction; introducing the generated arsenic metal vapor and other flue gas into a reduction device which is filled with charcoal and arranged outside the furnace, and carrying out second-stage carbon thermal reduction at 800-1000 DEG C under a pressure of 0-20Pa; and introducing the arsenic metal vapor generated through two-stage reduction into a arsenic metal condensing and settling chamber to obtain arsenic metal blocks, and condensing and settling the arsenic trioxide which is not fully reduced in a settling vat. The method provided by the invention causes less environment pollution, does little harm to the health of operating personnel, and can realize the continuous production in the technical process; and the total reduction rate and purity of the arsenic metal are high.

The invention provides a boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking, belonging to the technical field of steelmaking. The slag-melting agent is made from the following components in parts of by weight: 30-50 parts of boron sludge, 20-40 parts of laterite, 20-40 parts of quicklime and 5-15 parts of ferric oxide. The preparation method of the slag-melting agent comprises the following steps: sufficiently drying and dehydrating the raw materials, and weighting and proportioning based on weight parts; and grinding, evenly mixing, and making block slag by a pelleting-drying-sintering method or premelting-cooling-crushing-sieving method. Compared with the prior art, the invention has the following beneficial effects: the product provided by the invention is used as the fluxing agent instead of fluorite, calcium aluminate and ferriferous oxide, thereby eliminating fluorine pollution and relieving the corrosion action of the slag-melting agent on the furnace lining; and particularly, the waste boron sludge are recycled, and high-cost calcium aluminate is replaced with low-cost laterite with abundant reserves, thus the boron-containing fluorine-free fluxing slag-melting agent provided by the invention has important meanings for reasonably and comprehensively utilizing mineral resources, lowering the steelmaking cost, and realizing high-efficiency low-cost low-pollution green steelmaking.

The invention relates to an edging cube-shaped cobalt-iron prussian blue nanometer material and a preparation method thereof. The preparation method comprises the following steps of firstly, stirring and dissolving a surfactant into water under the magnetic action; after dissolving, sequentially adding sodium citrate and cobalt salt to prepare a solution A; then, dissolving potassium ferricyanide solid into water to prepare a solution B; gradually dripping the solution A into the solution B while stirring; after dripping, continuing to stir for a period of time; standing and aging the reaction liquid for a period of time, naturally cooling, centrifuging, washing, and drying, so as to obtain the edging cube-shaped cobalt-iron prussian blue nanometer material. Compared with the prior art, the synthesizing method has the advantages that by changing the conditions, the edging cube-shaped cobalt-iron prussian blue nanometer material is prepared; the morphology and structure of the material are not reported in the literature; the preparation is simple, the implementing is easy, and the large-batch preparation effect is realized.

A rapid stabilization processing method for thermal state massive steel slag pertains to the field of thermal state massive steel slag processing technique. Thermal state solid steel slag enters in a rapid stabilization processing apparatus, CO2 gas and water vapor are accessed at the same time when the rapid stabilization processing apparatus rotates, CO2 has a chemical reaction with f-CaO and f-MgO in the steel slag, and then covers the material granule surface of f-CaO and f-MgO that do not react in the steel slag; through massive the interaction between massive steel slag or the interaction between steel slag and grinding media, the steel slag is granulated and simultaneously the hard shell of newly generated CaCO3 and MgCO3 are damaged, to expose the f-CaO and f-MgO that do not react in the steel slag; through continuous reaction between CO2, water vapor and f-CaO, f-MgO, the f-CaO and f-MgO in the steel slag can have total overall reaction, and ultimately realize rapid stabilization of steel slag.

High-density thermodynamically stable nanostructured copper-based metallic systems, and methods of making, are presented herein. A ternary high-density thermodynamically stable nanostructured copper-based metallic system includes: a solvent of copper (Cu) metal; that comprises 50 to 95 atomic percent (at. %) of the metallic system; a first solute metal dispersed in the solvent that comprises 0.01 to 50 at. % of the metallic system; and a second solute metal dispersed in the solvent that comprises 0.01 to 50 at. % of the metallic system. The internal grain size of the solvent is suppressed to no more than 250 nm at 98% of the melting point temperature of the solvent and the solute metals remain uniformly dispersed in the solvent at that temperature. Processes for forming these metallic systems include: subjecting powder metals to a high-energy milling process, and consolidating the resultant powder metal subjected to the milling to form a bulk material.

The invention relates to a lead-free free-cutting brass alloy. The lead-free free-cutting brass alloy is prepared from the following raw materials in percent by weight: 26.0-38.0% of zinc, 0.2-3.5% of bismuth, 1.0-2.1% of manganese, 0.5-2.0% of tin, 0.3-2.0% of nickel, 0.1-0.4% of rare earth lanthanum, less than 0.1% of impurity and 52.0-71.6% of copper. The concrete preparation method comprises the steps of weighing the raw materials in a formula, sequentially placing the raw materials into a intermediate-frequency smelting furnace, heating up and degassing, deslagging and standing, smelting, casting, and carrying out deformation hot working treatment. Microhardness of the lead-free free-cutting brass alloy disclosed by the invention is 130-150HV, tensile strength is more than 450MPa, and elongation is more than 20%; thickness of a dezincification layer in a dezincification corrosion test is 150-200mu m and is far below 350-400mu m, namely the thickness of the dezincification layer of a lead brass alloy; and recycled leftover materials of a nickel-tin-plated copper plate are selected as raw materials in the preparation method disclosed by the invention, and cost is low, thus having energy-saving and environment-friendly significances.

The invention discloses a preparation method of ultra-coarse tungsten carbide powder. The preparation method comprises the following steps: evenly mixing LiOH solution or Na<2>CO<3>solution with tungsten trioxide in an atomized doping mode; adding the mixed raw material to a four-tube reduction furnace for slow-push reduction, and sieving with a 80-mesh sieve to obtain ultra-coarse tungsten powder with Fisher particle size of 30-40mum; crushing conventional carbon black to obtain fine carbon powder, mixing the fine carbon powder with the tungsten powder in a mixer for 50-70 minutes, and carrying out ball-milling on the mixed powder in a ball mill for 50-70 minutes by utilizing 60kg of a stainless steel ball to obtain evenly mixed W+C powder; adding the evenly mixed W+C powder to a high-temperature carbon tube furnace for high-temperature carbonization to obtain block tungsten carbide; and ball-milling and crushing the obtained block tungsten carbide, and then sieving with a 120 mesh sieve to finally obtain ultra-coarse tungsten carbide particles with particle size of 30-40mum. The ultra-coarse tungsten carbide powder obtained by the method has the advantages of high combined carbon content, good total carbon uniformity, high supply-state and grinding-state Fisher particle size and high primary qualification rate.

The invention provides a production method for high-purity chromium metal. The method includes the steps that prepared raw materials are put in a dry type mixer to be mixed according to a weight ratio; the uniformly mixed raw materials are put in a blank press for blank making; then a blank is put in a material chamber of a vacuum arc furnace so as to obtain a large chromium metal block; the baked chromium metal block is taken out and cooled; the cooled chromium metal block is delivered into a shot-blast chamber so as to obtain a metal block; the metal block is hammered and broken into 100-mm blocks; the hammered and broken blocks are delivered into a jaw crusher to be crushed into broken chromium metal blocks which meet the national standard; and the broken chromium metal blocks are put in a graphite box, then degassing is performed at the vacuum degree of 10 Pa and the temperature of 1300 DEG C, and therefore the high-purity chromium metal is formed.

The disclosed Ga-Ge-Bi-Pb fluorescent glass material doped with rare earth is prepared by: mixing and fusing the Ga2O3, Bi2O3, GeO2, lead-contained compound and rare earth compound to obtain the fused glass liquor; clearing and pouring the liquor into the mold to obtain the glass; putting the glass rapidly into a muffle furnace with temperature as the glass transformation temperature for heat preservation; finally, cooling to room temperature. This product can be manufactured into different shape, and has wide application as the gain medium.

The invention relates to a method for preparing a thermoelectric compound. The method for preparing a AgSbTe2 thermoelectric material by combining fusant rotatable swinging and discharge plasma sintering is characterized by comprising the following steps of: (1) mixing; weighing thread-shaped Ag, block-shaped Te and granular Sb as initial raw materials according to a chemical formula AgSbTe2+x, wherein x is equal to 0-0.08; (2) preparing mother alloy; mixing the thread-shaped Ag, the block-shaped Te and the granular Sb, placing the mixture into a smelting furnace, heating to 700 DEG C, smelting for 8-10 hours, cooling to 550 DEG C and then quenching in supersaturated saline water to obtain the mother alloy; (3) grinding and tabletting the mother alloy, placing the mother alloy into an induction heating furnace to melt to form a fusant and then rotatably swinging the fusant to obtain a band-shaped product having an amorphous / nanocrystal composite structure; and (4) grinding the band-shaped product having an amorphous / nanocrystal composite structure and carrying out spark plasma sintering to obtain the AgSbTe2 thermoelectric material. The method has short preparation period, low cost, pure phase, simple and easy control of process, safety and no pollution.

The invention discloses a method for treating refuse burning fly ash, which comprises steps as follows: (1) preparing a stabilizer solution from (by weight part) compounds containing pentahydroxy acetate 0.3-3, compounds containing dimethylamino sulfate 0.5-12 and water 20-50; (2) adding the stabilizer solution into 100 weight parts of refuse burning fly ash while stirring, and stirring to obtain a thick slurry; (3) adding 1-10 weight parts of compounds containing silicate into the thick slurry, and stirring to obtain a grout mixture; (4) feeding the grout mixture into an extruding machine, and extruding to obtain massive blanks; and (5) placing the blanks in a steam chamber, standing, curing, and conducting landfill disposal. The method has the advantages of low treatment cost, low volume-added ratio, and no secondary pollution; and can be widely used in treating refuse burning fly ash.

The invention aims to provide a process for preparing layered silicon nitride ceramic with high strength and high toughness by utilizing component gradient design, which comprises the following steps: (1), selecting alpha-Al2O3 and Y2O3 as sintering aids; (2), burdening, respectively weighing commercially available alpha-Si3N4, alpha-Al2O3 and Y2O3 powder according to the proportion of a burden sheet, taking absolute ethyl alcohol as a dispersion medium and a silicon nitride ball with the diameter of 2-3 mm as a grinding medium, ball-milling and uniformly mixing in a nylon tank, and controlling the granularity of a mixed material at about D50=0.2 mu m; (3), forming, adding a 5-9 wt% of polyving akohol (PVA) solution with the concentration of 3 wt% as a temporary binder into the mixed powder, adding various materials with corresponding numbers according to the charging sequence in the picture 1, pressing into blocky structures by using an isostatic pressing machine below 100 MPa, and controlling the thickness of each layer after being pressed at about 2 mm; and (4), sintering.

The invention discloses a tungstate low-temperature sintered microwave dielectric ceramic material and a preparation method thereof. The molecular structure expression of the material is that: [Zn1-x(Li0.5Sm0.5)x]WO4, wherein x is more than or equal to 0.05 and less than or equal to 0.8. The preparation method comprises the following steps of: mixing prepared chemical raw materials, adding alcohol into the mixture, mixing the mixture for 4 hours by a wet milling process, drying, sieving and pressing the mixture to form blocky materials, putting the blocky materials into an alumina crucible, raising the temperature to between 700 and 800 DEG C at a speed of 5 DEG C / min, and preserving the heat for 4 to 8 hours to obtain clinkers; crushing the clinkers, performing secondary ball milling and drying and pelletizing to obtain porcelain; and sintering the porcelain at the temperature of between 800 and 850 DEG C for 2 to 4 hours. The microwave dielectric ceramic material has the advantages of simple chemical composition and preparation process and low inherent sintering temperature (between 800 and 850 DEG C). By the preparation method, the prepared ceramic material has a dielectric constant of 14 to 17, high Q*f and low temperature frequency coefficient. The material and the preparation method can be used for manufacturing microwave devices, such as low temperature co-fired ceramics (LTCC), multilayer dielectric resonators, microwave antennae, filters and the like.

The invention belongs to the technical field of food production, and in particular relates to a preparation method and application of artificial water-soluble silicon. The preparation method specifically comprises the following steps of: (1) uniformly mixing 36-70% of silicon dioxide powder and 30-64% of sodium carbonate powder in percentage by weight; (2) heating the powder mixed in the step (1) to 1050-2000 DEG C in a reverberatory furnace, and calcining to generate molten sodium silicate; (3) pouring the molten sodium silicate generated in the step (2) out of a discharge port of the reverberatory furnace, and cooling to prepare a blocky sodium silicate solid preparation for later use; (4) pouring the molten sodium silicate generated in the step (2) out of the discharge port of the reverberatory furnace, putting the molten sodium silicate into a water-quench tank, and smashing the molten sodium silicate into a 1-5mm sodium silicate particle solid preparation for later use; and (5) continuously grinding the sodium silicate particles generated in the step (4) to form a sodium silicate powder solid preparation for later use. The artificial water-soluble silicon can be used for large-scale production and has a wide application range.

The invention discloses a heat-insulating coating material for firing enamel on the surface of a titanium alloy and a preparation method thereof. The formula of the heat-insulating coating material comprises the following components: SiO2, Al2O3, B2O3, CoO, TiO2, CaO, NaNO3, KMnO4, ZrO2, V2O5, CaF2 and NiO. The preparation method comprises the following steps of: completely blending raw materials according to the formula, uniformly mixing through ball milling to melt into molten liquid, carrying out water quenching, and drying to obtain a massive enamel glaze; adding grinding additives, carrying out ball milling to obtain glaze slip, spraying to a titanium alloy substrate, and firing and preserving temperature to obtain an enamel coating on the titanium alloy substrate. According to the heat-insulating coating material, the weight increase of the enamel coating in 900 DEG C air oxidation is less than 0.1 mg / cm<2>, the weight loss of the enamel coating in 850 DEG C fused salt corrosion is less than 0.1 mg / cm<2>, the enamel coating has good adhesive force with a metal substrate, the temperature difference urgent change resistance is higher than 300 DEG C, and the mechanical shock resistance is more than 300*10<-3>J.

A glass ceramics with Li2O-SiO2-P2O5 as main materials and its production are disclosed. The glass ceramics consists of SiO2:60í½75wt%, Li2O:15í½18wt%, P2O5:2í½11wt%, ZnO:2.5í½3.5wt%, K2O:4í½6.5wt% and CaO:1í½1.5wt%. The process is carried out by ball grinding, drying, melting the powders in crucible, water quenching the obtained glass solution into blocked glass, ball grinding the glass into powder, placing the powder in hot-pressure sintering furnace, pressurizing by single axle, sintering, mould releasing and cooling to obtain glass ceramics with lithium disilicate. The crystal has better devitrification and mechanical performances.

The invention discloses a carbon nitride nanotube and a preparation method thereof. The component of the carbon nitride nanotube is carbon nitride represented by the chemical structural formula of C3N(4+ / -x). According to the preparation method, a urea solution is prepared from urea and sodium bicarbonate in a mole ratio, then the solution is cooled to be frozen wholly, and uniform white blocky solids are obtained; the white blocky solids are transferred into a vacuum freeze dryer rapidly and subjected to freeze drying under the conditions of the vacuum lower than or equal to 20 Pa and the freezing temperature lower than or equal to subzero 50 DEG C, solids are obtained through calcination in a nitrogen atmosphere furnace, a yellowish powdery sample is obtained and subjected to dialysis and purification, and the yellowish carbon nitride nanotube is obtained. The method is effective, practical and simple, is applicable to preparation in a laboratory and industrial production and has broad development space and great application prospect.

The invention discloses a process for whitening calcined black talc. Black talc ore is taken as a raw material and is sequentially subjected to mineral separation, crushing, grinding, calcining in a rotary kiln and cooling by a cooling machine, and then granular and blocky calcined black talc products with whiteness of more than or equal to 90 are obtained, wherein the temperature of a burning zone in the calcining procedure in the rotary kiln is 800-1400 DEG C, and the standing time of the raw material in the kiln is 30-90 min. The invention also discloses a device adopting the method. According to the process and the device, a preheater system is adopted for preheating, and a rotary kin calcining process is adopted, so that the calcining time is greatly shortened, and the production capacity is remarkably improved; combustion and heat release of organic matters in black talc are fully considered; the production cost is lowered due to no addition of a whitening agent; dry-method grinding is adopted, and the process is advanced; compared with a process that the black talc is calcined by an annular kiln, the process disclosed by the invention has the advantages that emitted waste gas can be treated to reach the national environmental requirement, the automation degree is high, and parameters are measureable and controllable.