60results about How to "Short smelting time" patented technology

The invention belongs to the technical field of corrosion and prevention, and in particular relates to a casting method of an aluminum alloy sacrificial anode. The casting method comprises the following steps: adding basic electrolytic molten aluminum to a resistance furnace; then adding a zinc ingot to obtain molten aluminum alloy; performing jet refining on the molten aluminum alloy by adopting an argon located refining agent; charging argon to refined aluminum alloy melt to degas; drossing oxidizing scum on the surface of the aluminum alloy melt through a drossing tool; adding a low melting point metallic element to drossed aluminum alloy melt; electromagnetically agitating the melt after pressing the low melting point metal; carrying out ceramic filtering; pouring and casting the aluminum alloy melt to a preheated iron anode mould at an even casting speed under the temperature of 700 to 740 DEG C until the mould is full of the aluminum alloy melt; and moving the aluminum alloy melt out of the mould after cooling, solidifying and molding, so as to obtain the aluminum alloy sacrificial anode. The casting method has the characteristics of being short in smelting time, small in loss of iron scale, high in degassing and purifying performances, and low in smelting cost.

A laser furnace for smelting different alloys, the metal or alloy difficult to smelt, pure alloy, etc is composed of furnace body, copper mould, cooling water unit, atmosphere protector, upper furnace body and top cover, and features the laser beams are used as heat source for smelting alloy.

The invention relates to an electric contact material, in particular to a graphene reinforced copper-matrix electric contact composite material and a preparation method of the material. The electric contact material consists of the following components in percentage by weight: 0.1-1.0% of nickelized graphene and 99.0-99.9% of copper alloy. The preparation method comprises the steps of graphene nickelizing, copper alloy pulverizing, ball-milling and powder mixing, densification processing and vacuum electric arc smelting. According to the electric contact material disclosed by the invention, the nickelized graphene is added in the copper alloy and serves as the framework, so that the material has high hardness, mechanical impact-resistance and electric arc ablation resistance; and the lowering of the electric conductivity and the heat conductivity is avoided. Vacuum electric arc smelting is adopted, so that the smelting time is short; segregation of graphene particles is avoided; and the oxidation of the copper matrix is effectively prevented.

The invention discloses a zinc alloy and a manufacturing method thereof. The zinc alloy comprises the following elements: 4-7% of Al, 0.5-1.5% of Cu, 0.4-0.7% of Ti, 0.07-0.1% of B, 0.02-0.025% of Mg,0.1-1% of others, and the balance Zn. The method comprises the following steps: (1) pure aluminum is heated to a molten state, and is sprayed on the inner surface of a crucible; and a filter structure is fixed on the side surface of the inner surface; (2) zinc alloy raw materials are put in the crucible, and are vacuumized and heated until the raw materials are totally molten to obtain a molten pool; (3) a graphite stirring device is started; and a refining agent is continuously added to obtain a purified molten pool; (4) the purified molten pool is modified, and is cast and molded by a cooling extrusion process to obtain a zinc alloy ingot to be treated; and (5) the zinc alloy ingot to be treated is subjected to spheroidizing annealing to obtain the needed zinc alloy. The zinc alloy is high in purity, low in large-size dendritic segregation, uniform in overall grain size refining and low in primary structure multiple eutectic dendritic crystals.

The present invention provides a process for extracting noble metals from anode slime, comprising: mixing sodium carbonate, quartz and coke powder and impurity-removed anode slime, and subjecting the mixture to smelting and converting to obtain alloys of noble metals. The present invention avoids problem of lead pollution by using metallic bismuth to collect noble metals; meanwhile, metallic bismuth has low melting point, high specific gravity, and formation heat of bismuth oxide of 45.6 kcal/g atomic oxygen, thus it is easy to be reduced and the reduction temperature is low, which are beneficial for saving energy consumption and reduction time; the much smaller amounts of copper, nickel, antimony and arsenic entering noble bismuth in a slightly reductive smelting atmosphere than those entering noble lead make the converting of noble bismuth become simple, thereby decreasing smelting time and increasing the direct recovery rate of noble metals in anode slime.

The invention discloses a crude zinc smelting method and a smelting kiln used thereby. The method comprises the following steps: a pyrometallury technique is adopted for smelting and the smelting steps comprise loading, preheating, high-temperature smelting and condensing; the smelting kiln is internally provided with a preheating section, a high-temperature smelting section and a condenser; the raw materials are loaded into the smelting kiln by a feed inlet of the smelting kiln, and then enter the high-temperature smelting section for heating after the preheating section is preheated, and thegenerated zinc steam enters the condenser for condensation; the condensed waste gas enters the preheating section to preheat the raw material, and is exhausted out the smelting kiln by a gas outlet arranged on the smelting kiln, and the waste gas uses a cloth bag for removing dust; and the zinc solution generated by condensation is discharged to a zinc storing tank by a liquid outlet arranged onthe smelting kiln, and the waste residue is discharged out the smelting kiln by a spiral residue-discharging device arranged at the tail part of the smelting kiln. The invention is characterized by small occupied area, large yield, high heat utilization ratio, high recovery ratio, low production cost, capability of treating various renewable zinc ash raw materials and the like, not only is suitable for crude zinc smelting, but also is suitable for smelting other similar non-ferrous metals.

The invention relates to a magnesium-stannum-zinc-aluminum wrought magnesium alloy suitable for being extruded. The wrought magnesium alloy comprises the following components in percentage by mass: 3-5% of Sn, 1% of Al, 0.5-2.0% of Zn, less than or equal to 0.10% of inevitable impurities and the balance of Mg. According to the alloy provided by the invention, the Mg-Sn magnesium alloy is subjected to modification treatment by adopting Zn and Al, so that the grains can be refined and the alloy tissue can be improved. Meanwhile, the tensile strength and the ductility of the alloy are improved to facilitate processing and moulding in the later period. The wrought magnesium alloy provided by the invention is simple in preparation method, relatively low in equipment cost and easy to implement.

The invention discloses a melting technology suitable for producing a nodulizing agent by using a 3-ton intermediate frequency furnace. The melting technology for the nodulizing agent includes the steps of 1, silicone and iron are added into the bottom of the 3-ton medium-frequency furnace, then magnesium ingots are added, and waste steel is added, wherein the waste steel includes two types, firstly the blocky waste steel is added into the intermediate frequency furnace, and then Re and Ca components are added; 2, the current of the 3-ton medium-frequency furnace is controlled to be 450-750A, then the strip-shaped waste steel is added into the intermediate frequency furnace to be melted, the temperature in the intermediate frequency furnace is controlled to be 1250-1270 DEG C, and the furnace burden is stirred uniformly after being completely melted; and 3, the current is reduced to be 0A, then the furnace is tilted, the molten iron is poured into a nodulizing agent mold, when the temperature is lowered to 1150 DEG C, a nodulizing agent lifting hook is inserted into the nodulizing agent solution, then the nodulizing agent solution is air-cooled to room temperature, and when the nodulizing agent is cooled until the surface becomes dark red, the nodulizing agent can be lifted to a nodulizing agent stacking site by using a travelling crane.

The invention relates to glass powder for a solar back-silver electrode in the field of solar cells. The glass powder comprises the following components in parts by mass: 58 parts of Bi2O3, 10-30 parts of B2O3, 5-15 parts of SiO2, 3-10 parts of ZnO, 5-10 parts of BaO2, 0.5-5 parts of BeO, 0.5-5 parts of MgO and 0.5-2 parts of MoO2, wherein a colored glaze powder binding phase has the softening point of 550-630 DEG C, the density of 2-3g/cm<3>, and the expansion coefficient of (38-50)*10<-7>/DEG C. The expansion coefficient, softening point and density of the glass powder are matched with those of a cell silicon wafer and an aluminum-back surface field, so that the adhesion of the glass powder to the silicon wafer and the aluminum-back surface field after sintering can be obviously improved, the welding property of silver paste and the matching property with aluminum paste can be improved, and the printing quantity can be reduced. The glass powder disclosed by the invention is moderate in expansion coefficient and softening point; in the sintering process of configured silver paste, with the increase of the temperature, the glass powder begins to be softened and melt, and silver powder begins to be melt; in the cooling process, the glass powder is shrunk to ensure that a back-surface silver electrode is densified, the excellent anti-aging property of the silver electrode is ensured, and the reliability of components is improved.

The invention belongs to the field of ferrous metallurgy, and in particular relates to a deoxidation method for high-nitrogen steel. The method is characterized in that the deoxidation process is carried out in a medium-frequency vacuum induction furnace; the suitable crucible comprises the components of 97.5%-99% of MgO, 0.5%-0.7% of SiO2, and 0.3%-2% of other components; the alloy components comprise 20%-21% of Cr, 6%-7% of Ni, 8%-10% of Mn, and the balance of Fe; the manner for increasing nitrogen in liquid steel adopts nitralloy, the alloy comprises chromium nitride or manganese nitride, and the nitrogen increasing process is carried out under the protection of nitrogen of 0.06MPa-0.08MPa; and aluminium is adopted as a deoxidant, and after aluminium is added, smelting process needs to be continued for 15-25 minutes. Compared with the deoxidation technology adopting a complex deoxidant comprising alkaline earth such as calcium, magnesium, barium and the like, the deoxidation method for high-nitrogen steel has the advantages that special requirements on smelting equipment is not needed; the deoxidant is cheap, does not need to be prepared specially, and can be added conveniently; and the smelting time is short, the deoxidation result is stable and reliable, residue of the deoxidation product is little, no harmful elements affecting the property of the steel are introduced, and the smelting cost is greatly lowered.

The invention provides a preparation method of spherical amorphous alloy powder, and relates to the technical field of amorphous alloy powder preparation, The preparation method comprises the following steps of selecting pure iron, pure chromium, pure molybdenum, pure graphite, silicon, boron iron and yttrium iron, and enabling the atomic ratio of Fe, Cr, Mo, B, C, Si and Y elements in the raw materials to satisfy the ratio range of 43.12-44.88: 18.62-19.38: 13.72-14.28: 5.88-6.12: 13.72-14.28: 0.98-1.02; smelting pure iron, pure chromium, pure molybdenum and pure graphite, and after smeltingto a molten state liquid, adding silicon, boron iron and yttrium iron together for smelting; and when all the raw materials are smelted to a molten state liquid, preparing the spherical amorphous alloy powder by using an air atomization method. In the preparation method, pure iron, pure chromium, pure molybdenum and pure graphite are fed and smelted firstly, the smelting is mainly used for fast dissolving materials, so that the oxygen increment in the material is reduced; and the silicon, the boron iron and the yttrium iron adopt a secondary feeding mode, mainly for controlling the components,the addition amount and time are precisely controlled through secondary feeding, and the burning loss of the Si, B and Y elements is reduced or avoided.

The invention relates to a production process of high-heat-conductivity and high-heat-strength hot work die steel, and belongs to the technical field of hot work die steel. A base body of the die steel comprises 0.32%-0.38% of C, 1.2%-1.6% of W, 3.6%-4.2% of Mo, 0.08%-1.4% of V, 0.06%-0.1% of Mn, 0.15%-0.18% of Cr, 0.02%-0.04% of S i and the balance Fe, a nucleating auxiliary is added into the base body, the nucleating auxiliary is prepared from nanoscale carbon powder, boron nitride and tantalum powder, more crystal nucleuses are provided for the base body, tantalum and carbon form tantalum carbide at the high temperature, the effects of refining grains and improving heat conductivity are achieved, and the heat conductivity of the die steel is improved. Meanwhile, a high-melting-point strengthening phase formed by tantalum carbide and boron nitride forms dispersion strengthening, so that the strength of the matrix is improved; through testing, the hardness of the hot work die steel reaches 51.3-57.6 HRC at the temperature of 600 DEG C, and the heat conductivity coefficient of the hot work die steel reaches 28.7-31.2 w/m.K at the room temperature.