112 results about "Sodium hexafluoroaluminate" patented technology

The invention discloses a covering agent for smelting copper alloy, which is prepared by adopting the mixture of calcium chloride, potassium chloride, sodium chloride, sodium fluoaluminate and calcium fluoride; one layer of favourable protective layer with the thickness of 5-80 mm is formed on the surface of smelting furnace solution so as to effectively prevent oxygen in air outside a molten pool from entering and avoid oxidation burning loss of alloy elements in the smelting process, and the covering agent has the action of thermal insulation. The covering agent of the invention can ensure that copper alloy requiring vacuum smelting can be smelted under the atmospheric environment. The covering agent of the invention is suitable for smelting copper alloy, such as copper zirconium, copper chromium, copper magnesium, copper chromium zirconium and the like which contain oxidizable elements, and is suitable for ingot blank casting, vertical continuous casting, horizontal continuous casting, up-drawing continuous casting and the like.

The invention relates to a method for preparing foamed glass by using waste fiberglass products, which comprises the following steps of: firstly, airing collected waste fiberglass mats and fiberglass meshes, manually sorting out the impurities of metal, organic matter and the like, cutting into fragments smaller than 20 mm*20 mm, and ball-milling to 200 meshes to form glass powder; loading the glass powder, silicon carbide, diantimony trioxide, sodium sulfate, sodium fluoaluminate, sodium nitrate and cobalt oxide into a ball mill, and ball-milling to form a batch; loading the batch into a heat-resisting mold, and firing into foam glass. In the invention, the waste fiberglass products are used as a main raw material to produce foam glass, and the prepared foam glass has low density, high strength, small heat conductivity and low water absorption rate. The preparation method has simple operation process, low founding temperature and low cost, not only changes wastes into valuables, but also protects the environment, and is applicable to industrial production.

The invention discloses a sintered flux for use in submerged-arc welding. The sintered flux comprises a dry powder combination and a bonding agent, wherein the dry powder combination consists of the following components in percentage by weight: 40-52 percent of CaF2, 38-47 percent of Al2O3, 4-8 percent of CaCO3, 0.5-3 percent of metal aluminum powder and 0.5-3 percent of sodium fluoroaluminate, wherein the bonding agent consists of 1:1 potassium sodium water glass; the using amount of the bonding agent is 20-32 percent of the weight of the dry powder in the welded flux. The sintered flux for use in submerged-arc welding is matched with an ERNiCrMo-3 welding wire, has the advantages of standard and stable welding, excellent slag detachability, uniform width of a welding bead, appropriate pile height, smooth transition with parent metal and no defects of gas indentations, crystallization lines, cracks, bonded slag and the like on the surface of a welding line.

The invention relates to the field of synthesis of aluminum intermediate alloys, in particular to a preparation technology of an aluminum intermediate alloy. According to the preparation technology of the aluminum intermediate alloy, aluminum ingots are fed into an electric induction furnace and molten, and the temperature of the molten aluminum is raised to 660-850 DEG C; then, magnesium fluoride, sodium hexafluoroaluminate, potassium hexafluoroaluminate and potassium chloride are mixed into a mixture, the mixture is fed into the electric induction furnace, and the temperature is raised to 750-1000 DEG C; one or two of scandium oxide and scandium chloride are added into the electric induction furnace to a reaction, and after the reaction is qualified, a slagging former is added to remove remaining fused salt on the surface of the alloy; the temperature of the alloy is kept at 760-900 DEG C, a rotating exhauster is used for feeding argon to conduct refining degassing; and then, the slagging former is added for secondary slagging treatment. By the adoption of the preparation technology of the aluminum intermediate alloy, the electric induction furnace is utilized, the chloride and the fluoride are mixed and then added to high-temperature molten aluminum with the surface covered with fused salt, the aluminum-scandium alloy is directly generated, and the problems that when the aluminum-scandium alloy is prepared through a mix-melting method, cost is high, the energy consumption is high, time is long, efficiency is low, and the quality is not stable are solved.

The invention provides a high-efficiency aluminum alloy refining agent, as well as a preparation method and a usage method thereof. The high-efficiency aluminum alloy refining agent comprises refining agent components including sodium chloride, potassium chloride, potassium fluosilicate, sodium fluoaluminate, light-weight sodium carbonate, calcium fluoride, hexachloroethane, sodium sulfate, potassium fluoaluminate and quartz sand. The preparation method of the high-efficiency aluminum alloy refining agent comprises the following steps: respectively weighing all the components according to the weight percentage of the refining agent components, and fully mixing to obtain the high-efficiency aluminum alloy refining agent. The usage method of the high-efficiency aluminum alloy refining agent comprises the following steps: placing the high-efficiency aluminum alloy refining agent into a refining tank, introducing nitrogen gas or argon gas into the refining tank when the temperature of aluminum alloy liquid achieves 700-740DEG C, and delivering the high-efficiency aluminum alloy refining agent into the aluminum alloy liquid. The high-efficiency aluminum alloy refining agent is strong in degassing and inclusion removal capabilities, high in reaction speed, high in deslagging efficiency and low in usage temperature. The preparation method and usage method of the high-efficiency aluminum alloy refining agent are simple and effective.

The invention discloses rare earth contained deslagging and refining flux for smelting of a cast aluminium alloy and a preparation method of the flux. The flux is formed by adding finely powdered rare earth oxide and rare earth carbonates to powder mainly containing sodium chloride, potassium chloride, sodium fluoroaluminate, sodium fluosilicate, sodium carbonate and calcium fluoride, and then carrying out mixing, dehydration and curing. Based on the characteristics of metamorphism and inactivation of rare earth on the aluminium alloy, the characteristic of promoting a series of low-melting-point impurities to form infusible compounds, and other characteristics of rare earth, if the flux is used during the smelting, a molten aluminium alloy can be effectively purified, the liquidity and casting property can be improved, the refinement of crystal grains in an aluminium alloy casting structure and dispersed precipitation of a second phase in the crystal grains can be facilitated, thus the strength, hardness, abrasive resistance and corrosion resistance of the aluminium alloy can be improved. With the adoption of the flux, the disadvantage that the conventional aluminium alloy deslagging and refining flux produces a large amount of harmful gas and smoke in a molten aluminium alloy purification treatment process is overcome.

The invention relates to a deslagging smelting flux for smelting a casting zinc alloy and a preparation method thereof. The flux is prepared by adding ultramicrofine rare earth oxide into powder mainly comprising sodium chloride, potassium chloride, sodium fluoroaluminate, sodium fluosilicate, sodium nitrate, sodium carbonate and sodium fluoride, and stirring, dehydrating and curing the materials. By using the flux, the zinc alloy fluid can be effectively purified, the liquidity and casting property can be improved, grains in a zinc alloy casting structure can be refined, and the second phase can be dispersed and separated out in the crystal, so that the strength, hardness, abrasive resistance and corrosion resistance of the zinc alloy are improved, and the defect that the environment is seriously polluted by a great amount of harmful gas and smoke dust produced by the conventional deslagging smelting flux for smelting zinc alloy is effectively overcome.

The invention discloses a supported solid base catalyst, a preparation method and an appliance thereof for compounding novel biological diesel oil, which relate to a solid base catalyst, a perpetration method and a method for catalyzing and preparing novel biological diesel oil, and aim to solve the problems that existing homogeneous base catalysts are not high in reaction activity, can not be recycled, are complex in post-processing process, need to neutralize and wash reaction products, and leads to discharge a lot of waste water and pollute environment. The supported solid base catalyst comprises sodium aluminate, potassium fluoride, sodium fluoride, potassium fluoroaluminate and sodium fluoroaluminate. The preparation method comprises steps: 1 x-KF/NaAlO2 precursors are prepared; and 2 drying and calcining, thereby obtaining the supported solid base catalyst. The method for catalyzing and preparing the novel biological diesel oil is that reaction materials and catalysts are added into a reactor with a reflux condensation device, are stirred and reacted in normal reaction pressure and protection of nitrogen, and then are centrifugally separated, decompressed and distilled. The supported solid base catalyst can be used to catalyze and compound the novel biological diesel oil.

The invention relates to an electrostatic dry powder spraying ceramic powder composite material, which comprises the combination of the following base materials in part by mass: 45 to 60 parts of network former, 2 to 17 parts of network forming and fusing agent, 8 to 13 parts of network modifier and fusing agent, 15 to 20 parts of flux and 5 to 7 parts of nucleating agent, wherein the network former is silicon dioxide; the network forming and fusing agent is diboron trioxide; the network modifier and the fusing agent are alumina, magnesia, calcium oxide, sodium fluoroaluminate and zinc oxide; the flux is sodium oxide, potassium oxide and lithium oxide; and the nucleating agent is titanium dioxide, zirconia and phosphorus pentoxide. A steel structure sprayed by the material in the open air and under atmospheric pollution environment for a long period can effectively prevent rust corrosion; and moreover, the service life of a highway guardrail plate, an upright post and the like can reach over 30 years.

The invention discloses a honing oilstone and a preparation method and application thereof. The honing oilstone comprises copper, tin, zinc, silver and superhard materials, and further comprises antimony, ferrophosphorus alloy, sodium hexafluoroaluminate, bronze, lubricant and wetting agent, wherein the feeding mass ratio of the copper, tin, zinc, silver, antimony, ferrophosphorus alloy, sodium hexafluoroaluminate, bronze, lubricant and wetting agent is 40-80:10-30:1-10:1-5:1:1-3:1-10:1-3:1-3:0.1-1, and the honing oilstoneis formed by mixing and sintering the raw materials. The preparation includes the steps of weighing raw material except the superhard materials according to the formula, mixing each weighed raw material with the superhard materials, sintering the mixture, and obtaining the honing oilstone. The application is the application of the honing oilstone in processing stainless steel materials. When the prepared honing oilstone is used to process materials difficult to process, such as stainless steel, no cutter adhesion, high precision and good processing surface integrity can be achieved, the preparation of the honing oilstone is simple, the cost is low, and the processing efficiency is high.

The invention discloses a method for the production of sodium aluminum fluoride, comprising the steps of: (1) adding anhydrous hydrofluoric acid to water at room temperature and pressure, for dissolving to produce a hydrofluoric acid solution with a concentration of 40% for use; (2) at room temperature and pressure, adding aluminum hydroxide and sodium hydroxide into a reaction tank according to a ratio to react to produce sodium meta-aluminate with stirring; (3) adding the hydrofluoric acid solution with the concentration of 40% in step (1) into the reaction tank in step (2) to react with sodium meta-aluminate to produce a crude product; and (4) precipitating, centrifuging, separating, washing and drying the obtained crude product to obtain finished sodium aluminum fluoride. The method for the production of sodium aluminum fluoride of the invention has simple process, easily controlled conditions, and a high production rate, and can achieve industrial mass production.

The invention relates to a dispersing agent for Al-Ti-B production and a preparation method thereof. The dispersing agent for Al-Ti-B production comprises (wt%) sodium fluoroaluminate 30-50, potassium chloride 20-30, sodium chloride 15-25, magnesium fluoride 10-20 and cerium chloride 2-5. The inventive preparation method comprises the following steps of: (1) mixing sodium fluoroaluminate, potassium chloride and sodium chloride at a proper proportion, adding into a crucible furnace, heating to melt, and stirring; (2) sequentially adding magnesium fluoride and cerium chloride, and stirring; and (3) pouring the obtained molten liquid into a mould, cooling, crushing, and pulverizing to obtain product. The inventive dispersing agent solves the stacking problem of large and needle-shaped TiAl3 phase and TiB2 phase in Al-Ti-B crystal grains; and can improve non-uniform structural distribution.

The invention discloses a lead residue reducing agent and a preparation method thereof and belongs to the technical field of chemical industry. The lead residue reducing agent comprises the following components in percentage by weight: 30 to 70 percent of active carbon, 5 to 20 percent of sodium sulfate, 5 to 15 percent of sodium hypophosphite, 1 to 15 percent of sodium hexafluoroaluminate, 3 to 18 percent of calcium oxide, 7 to 20 percent of precipitated silica, 1 to 5 percent of aluminium oxide, 1 to 5 percent of magnesium chloride, 0.1 to 2 percent of titanium trichloride and 0.5 to 5 percent of triethyl aluminum. The lead residue reducing agent can directly reduce oxide-state scum produced during alloy preparation of lead, calcium, tin and aluminum alloys and casting of grids of storage batteries into metal-state residue, so the residue amount of the lead, calcium, tin and aluminum alloys is reduced obviously. When the agent is used, the lead residue produced during the preparation of the lead, calcium, tin and aluminum alloys and the casting of grids can be directly reduced into molten metals of lead, calcium, tin and aluminum to flow back to an alloy pot, so the lead residueis reduced while the lead, calcium, tin and aluminum in the designated alloys are hardly lost; and thus, the effective ingredients of the grid alloys of the storage batteries are ensured.

The invention discloses a plating auxiliary for plating an alloy coating with high aluminum content on steel by using a solvent method. According to a formula, the plating auxiliary comprises the concrete components according to the content (g/L): 20-60g/L of potassium borohydride, 1-10g/L sodium hydroxide, 20-40g/L of calcium chloride, 10-40g/L of potassium fluoride, 3-20g/L of lithium chloride, 2-12g/L of sodium fluoroaluminate, 5-30g/L of potassium fluotitanate, 1-10g/L of nonionic surfactant and the balance of water. The plating auxiliary disclosed by the invention is simple in production process and capable of forming a uniform salt film on a piece to be plated. During hot plating, the plating auxiliary is not reacted with aluminum in a zinc solution, and sodium fluoroaluminate in the plating auxiliary can be used for cleaning an alumina film on the surface of the zinc solution, so that the plating leakage phenomenon is avoided, and the surface of a coating is bright.

The invention discloses a boride-containing aluminum alloy Mn-additive, belonging to the field of metal material technology. The compositions and the mass percentages thereof are as follows: 10%-25% sodium chloride, 10%-25% potassium chloride, 1%-10% sodium fluoaluminate, 1%-10% sodium borate, and 30%-75% manganese chloride. The Mn-additive can quickly react in an aluminum melt to reduce Mn, the actual yield is high, and the reaction is an exothermic reaction which causes no furnace temperature reduction. In addition, the Mn-additive produces primary iron rich phases more quickly and more easily than conventional Mn-additive, at the same time, the addition proportion of Mn is lessened, the Mn residual is reduced. The Mn-additive is convenient for use, low-cost, and is easy to operate.

The invention provides a method for recycling cryolite, calcium carbonate and sodium sulfate from calcium fluoride sludge resources. The method includes the following specific steps that 1, sulfuric acid is added into calcium fluoride sludge, the pH is adjusted to range from 1 to 3, calcium, existing in the form of calcium hydroxide and calcium carbonate, in the sludge is converted into calcium sulfate, and a solution A is obtained; 2, sodium aluminate solids are added into the solution A, stirring and leaching are carried out, and calcium fluoride is converted into fluoaluminic acid, calcium sulfate precipitates S1 and a solution B; 3, sodium carbonate is added into the solution B, the pH ranges from 0.1 to 2, sodium sulfate is replenished, the calcium sulfate is promoted to be completely precipitated, and cryolite and a solution C are obtained; 4, a sodium bicarbonate solution is added into the precipitates S1 for treatment, and calcium carbonate and a solution D are obtained through filtering; 5, the solution C and the solution D are mixed and subjected to evaporative crystallization to obtain sodium sulfate. The method has the advantages that process conditions are easy to control, and large-scale production is easy, and calcium fluoride sludge recycling can be achieved.

The invention relates to a steel core aluminum deoxidizer block and a preparation method thereof, and effectively solves the problems that the preparation of the steel core aluminum deoxidizer block is complex, the aluminum content is unstable and the appearance is rough. The technical proposal is as follows: an external layer is coated outside an internal layer, no slit exists between the internal layer and the external layer, the external layer is composed of a lower layer, a transition layer and an upper layer, the transition layer is positioned at the upper end of the lower layer, and the upper layer is positioned at the upper end of the transition layer. The preparation method thereof comprises the following steps: melting pure aluminum ingot to prepare aluminum liquid, adding 0.1-0.3% of sodium fluoroaluminate to 200kg of the aluminum liquid to be taken as a deslagging agent for deslagging, purifying molten aluminum, molding by 35%-65% of the purified molten aluminum and 35%-65% of steel core based on the weight percentages, taking out the purified molten aluminum of the weight percentages to be injected into a die, casting the purified molten aluminum to the top end of the lower layer of the die, stopping casting, vertically placing the weighed steel core of the weight percentages into the purified molten aluminum in the die, naturally cooling, and obtaining the steel core aluminum deoxidizer block by demolding. The method can help realize once casting molding and stable aluminum content, and is an innovation in the steelmaking field.

The invention discloses a low-temperature refining fluxing medium for aluminum alloy smelting and a preparation method for the low-temperature refining fluxing medium. And the low-temperature refining fluxing medium is characterized in that the low-temperature refining fluxing medium comprises, by weight, (1) 15-25 parts of sodium chloride, (2) 15-25 parts of potassium chloride, (3) 8-12 parts of sodium fluosilicate, (4) 3-8 parts of sodium fluoroaluminate, (5) 2-8 parts of light sodium carbonate, (6) 8-13 parts of calcium fluoride, (7) 18-30 parts of sodium nitrate, and (8) 3-5 parts of charcoal powder. The preparation method for the low-temperature refining fluxing medium comprises the following steps of A, adding the first six raw materials into a heating blender according to the weight ratio, stirring for 60 min at the temperature of 105-115 DEG C and the normal pressure, stopping heating and stirring, and obtaining a first mixture; B, adding the sodium nitrate and the charcoal powder into the first mixture according to the weight ratio, stirring for 10 min without heating, and obtaining a second mixture; and C, discharging the second mixture into the material containing plate, cooling the second mixture down to the indoor temperature naturally, and packaging the cooled down second mixture into finished products with 2 kg of the cooled down second mixture in a bag and 20 kg of the cooled down second mixture in a case. The preparation method is mainly used for the low-temperature refining fluxing medium for aluminum alloy smelting.

The invention belongs to the field of material surface modification and relates to a Ni-based high-temperature alloy surface boronizing agent and a use method thereof. The Ni-based high-temperature alloy surface boronizing agent comprises amorphous boron powder, activators and a filler according to a certain ratio, wherein the activators comprise sodium fluoroaluminate and cerium oxide and the filler is silicon carbide. Through use of a high-temperature boronizing technology and the Ni-based high-temperature alloy surface boronizing agent, Ni-based high-temperature alloy surface boronizing layer depth, hardness and uniformity are improved and brittleness is reduced. The boronizing layer has depth more than 0.1mm and hardness more than Hv1900 and is uniform and firm.

The invention provides a refining agent for production of aluminum alloy sacrificial anodes, and a preparation method thereof. The refining agent for production of aluminum alloy sacrificial anodes comprises 30-40wt% of sodium chloride, 45-55wt% of potassium chloride, 3-5wt% of calcium fluoride, and the balance of sodium hexafluoroaluminate. The preparation method comprises the following steps: 1, carrying out drying dehydration on sodium chloride, potassium chloride, calcium fluoride and sodium hexafluoroaluminate, and weighing the above raw materials according to above weight percentages; and 2, mechanically stirring the weighed raw materials for uniform mixing, heating to 750-850DEG to prepare a melt, condensing the melt, crushing the condensed melt, and screening to obtain powder which is the finished refining agent. The refining agent has the advantages of simple and reasonable design of components, good slag removal effect, degassing and covering effects, low use temperature and ideal effect.

The method comprises the following steps: adding acid and an oxidizing agent into battery powder for leaching, removing impurities from the obtained leaching solution to obtain a fluorine-containing solution, adding dawsonite into the fluorine-containing solution, simultaneously adding sulfuric acid, carrying out stirring reaction at a certain temperature, and carrying out solid-liquid separation to obtain a fluorine-removed solution and filter residues, and washing filter residues to obtain crude sodium hexafluoroaluminate. According to the method disclosed by the invention, the dawsonite is used for removing fluorine from the waste lithium battery, is good in selectivity, does not react with nickel, cobalt, manganese, lithium and the like in the solution, and only reacts with fluorine ions in the solution, so that the purpose of selectively removing fluorine is achieved, and the loss of nickel, cobalt, manganese and lithium metals in the solution is avoided; according to the fluorine removal reaction equation, one mole of aluminum can be combined with six moles of fluorine, the fluorine removal capacity is large, sodium ions in the solution are consumed during fluorine removal, the concentration of the sodium ions in the solution is reduced, and the quality of the nickel cobalt manganese sulfate solution product is improved.

The invention discloses a wear-resistant large white glaze, a ceramic product with the wear-resistant large white glaze and a preparation method thereof. The wear-resistant large white glaze is prepared from the following raw materials in parts by weight: 55-65 parts of quartz powder, 13-17 parts of potassium feldspar powder, 7-10 parts of talcum powder, 8-14 parts of cryolite powder (mainly sodium hexafluoroaluminate), 5-8 parts of spodumene powder, 3-5 parts of manganese nitrate, 3-5 parts of barium oxide, 3-5 parts of magnesium oxide, 4-6 parts of titanium oxide, 2-4 parts of scandium oxideand 5-8 parts of a high boron frit. The wear-resistant large white glaze or the ceramic product with the wear-resistant large white glaze is formed on the surface of a substrate, the surface of the substrate has smooth and fine glaze surface and good glossiness, is pure, bright white and beautiful, has good wear resistance, and is more wear-resistant than common white glaze ceramic products, andmost importantly, a small molecule wear-resistant agent not added in the wear-resistant large white glaze, the wear-resistant large white glaze is non-toxic and healthy to the body, and is especiallysuitable for daily ceramics such as tableware, household appliances and the like.