73results about How to "Lower the electrolysis temperature" patented technology

The invention relates the dysprosium-iron alloy technology with fused salt electrolysis process and device, belonging to rare-earth products preparing field. The method comprises the following steps: at high temperature, dysprosium oxide melting at fluoride, dysprosium oxide beginning ionizing; at the condition of 95V/M direct current field, separating out Dy3+ on the surface of iron cathode, deacidizing Dy3+ to Dy, and alloying Dy and Fe to form Dy-Fe. O2- is oxygenated to O2 on the surface of graphite cathode, and it reacts with carbite to form CO2. The melting point of dysprosium-iron (20úÑFe) is 1046Deg.C, and the melting point of Dy is 1407Deg.C, so the electrolyzation is carried out at 1050Deg.C. The invention has the advantages of low investment, low cost, simple technology, continuous production and low impurity content.

The invention relates to a method for preparing Al-Ti alloy or plated Al-Ti alloy by low-temperature electrolytic deposition of ionic liquid, which is characterized by synthesizing an ionic liquid from an organic material and anhydrous aluminium trichloride, adding a right amount of titanium salt to prepare an ionic liquid electrolyte, taking a substrate which is pre-treated as a deposition cathode and preparing Al-Ti alloy or plated Al-Ti alloy by direct current electrolytic deposition, wherein the titanium content within the alloy can be as high as 30%. The method provided by the invention has the advantages that the ionic liquid used therein has wide resource, low price and wide electrochemical window, the electrical conductivity is high, the ionic liquid is friendly to environment and the titanium salt can be effectively dissolved, the temperature of electrolytic deposition and cell voltage can be effectively reduced by using low-temperature electrolytic deposition process of ionic liquid to prepare Al-Ti alloy and the plating thereof, the energy consumption is reduced, the corrosion of the device is greatly reduced, the properties of the deposition layer which is obtained thereby are high and the thickness of the deposition layer and the titanium content of the alloy are easy to be controlled.

The invention designs a method for preparing nanometer aluminum or nanometer aluminum coating in an electro-deposition form by using an ion liquid/additive system. The method is characterized in that: ion liquid and anhydrous aluminum trichloride are mixed into a low-temperature electrolyte and suitable additives are added for preparing the ion liquid/additive system. A processed substrate is taken as a deposition cathode; the direct current electro-deposition is adopted for preparing the nanometer aluminum or nanometer aluminum coating; and the size of the aluminum grains is adjusted according to requirements. According to the method, the problems of high cost and small output of the present technology for producing the nanometer aluminum are solved; the adopted ion liquid is conventional ion liquid and is characterized by wide source, low cost, high conductivity, wide electrochemical window and being non-volatile and environment-friendly; the suitable additives are used, so that the high-quality nanometer aluminum or nanometer aluminum coating obtained in the conventional ion liquid is realized; the obtained aluminum deposited coating is compact, smooth and flat; a nanometer material can be obtained by using the ion liquid/additive system at lower temperature; the reaction is easy to control; the energy consumption is low; the obtained nanometer aluminum is high in quality and high in current efficiency; the size of the nanometer aluminum can be effectively controlled by adjusting the dosage and formula of the additives; the process is simple; the cost is low; and the application prospect is better.

The invention relates to a rare-earth ferroalloy for producing a rare-earth permanent magnetism material with high performance and a preparation process thereof. The ferroalloy comprises the contents according to the weight percentage: 30-90 of neodymium or didymium rare earth, and the balance ferrum and less than 1 of unavoidable impurities, wherein the O content is less than or equal to 0.1, the C content is less than or equal to 0.1 and the N content is less than or equal to 0.05. The alloy is prepared by an electrolytic method of fluoride molten salt system oxide, and an electrolyte of the alloy comprises rare-earth fluoride and lithium fluoride.

The large aluminum electrolyzing pre-roasting tank includes anode carbon block combination, anode bus, breaking and feeding unit, anode elevating mechanism, crossbeam and portal upright, tank sealing air exhaust system, tank casing, cathode structure and bottom heat insulating structure. It features the double anode structure comprising two anode carbon blocks assembled through aluminum rod and steel pawl; the elevator installed below the top surface of the crossbeam; the tank sealing air exhaust system set inside the crossbeam; and the cathode with surround casing, carbon block with bottom composite heat insulating layer, side silicon nitride to combine silicon carbide blocks and surrounding cast material. The present invention has improved structure resulting in raised fume collecting efficiency, reasonable gas flow distribution and smooth aluminum electrolyzing process.

The invention relates to a light rare earth base heavy rare earth alloy, a preparation technology and application thereof. The alloy contains 1-40wt% heavy rare earth, and is prepared by oxide fused salt electrolysis process in fluoride molten salt. The electrolyte is composed of rare earth fluoride, lithium fluoride and magnesium fluoride, the compositions are: 65 to 87wt% of base fluoride in rare earth fluoride, 5 to 25wt% of heavy rear earth fluoride, 5-12wt% of lithium fluoride and 0.5 to 3wt% of magnesium fluoride. Since the electric efficiency is larger than 75%, the metal recovery rate is large than 90%, the preparation technology is especially suitable for industrialized mass production.

The invention relates to a method for producing aluminum by adopting ionic liquid to directly electrolyze alumina at a low temperature, and is characterized in that the HSO4<-> type anionic ionic liquid dissolves alumina and is taken as a low temperature electrolyte, alumina is taken as raw material and is directly electrolyzed by the direct current, the tank voltage is higher than the decomposition voltage of alumina but lower than that of the electrochemical window of the ionic liquid, aluminum is separated out from the cathode, and CO2 is generated from the anode. The ionic liquid adopted by the invention has wide source, low price, good stability, high conductivity, and wide electrochemical window; the good stability is environmental friendly and can efficiently dissolve alumina at a low temperature; adopting the ionic liquid as the low temperature electrolyte greatly reduces the temperature of electrolysis and the tank voltage; the capacity usage ratio is high and the erosion of equipment is greatly reduced.

The invention discloses a rare earth iron alloy. The content of rare earth is 0-95 wt%; and the balance is iron and inevitable impurities with the total quantity of less than 0.5 wt%, wherein oxygen is not more than 0.01 wt%, carbon is not more than 0.01 wt%, phosphorus is not more than 0.01 wt%, and sulfur is not more than 0.005 wt%. The invention further discloses a preparation method of the rare earth iron alloy. The prepared rare earth iron alloy is uniform in component, low in segregation, low in impurity content, high in rare earth yield, low in cost and free of pollution, is applied to the rare earth steel, and is high in rare earth yield, prominent in effect and suitable for large-scale industrial production.

The invention provides a Mg Li -Samarium alloy and a method for preparing the same through fusion electrolysis. The method uses MgCl2+LiCl+KCl+KF as an electrolyte system in an electrolytic furnace, then adds anhydrous Sm2O3 powders to heat up to a melting temperature of 680 DEG C or anhydrous SmCl3 powders to heat up to a melting temperature of 630 DEG C, using metal molybdenum (Mo) as a cathode and graphite as an anode at an electrolysis temperature of between 630 and 810 DEG C, and adopts a sinking cathode method, in which a cathodic current density is 6.4 to16.0A/cm<2>,an anodic current density is 0.5A/cm<2> and a cell voltage is 5.1-8.4V, so as to deposit a Mg-Li-Sm alloy nearby the cathode in a fused-salt electrolysis cell after electrolyzing for 40 to 120 minutes. The method does not use metallic magnesium, metal lithium, or metallic samarium, but uses metal compound as raw materials to directly prepare the Mg-Li-Sm alloy through the fusion electrolysis method, thereby having the advantages of greatly shortening production flow and reducing the energy consumption and production cost due to the simple process with low temperature electrolysis.

This invention relates to a method for improving electrolyte performance in the technology of electrolyzing Al which adds weight percentage of 1-10% NaCl in the electrolyte to effectively change the composition of Al electrolyte, improving its chemical and physical performance to reduce its melting point and reduce the electrolyzing temperature by 20deg.C and increase its conductivity and current efficiency over 1%.

The invention provides a Mg-Li-Ce-La alloy and a method for directly preparing the same by molten salt electrolysis. The method comprises the following steps of: fusing at a temperature of between 750 and 800 DEG C after adding Ce-rich rare-earth carbonate (cerous carbonate and lanthanum carbonate) in an electrolytic furnace by taking MgCl2 plus LiCl plus KCl plus KF as an electrolyte system; depositing the Mg-Li-Ce-La alloy in a molten salt bath close to a cathode via electrolyzing for 1 to 2 hours with an inert metal electrode as the cathode and graphite as an anode, a sunk cathode method, at an electrolysis temperature of between 650 and 800 DEG C, with cathode current density between 12 and 20 A/cm<2>, anode current density 0.5 A/cm<2> and bath voltage between 5.5 and 9.0V. The method completely uses metal compounds as raw materials to directly prepare the Mg-Li-Ce-La alloy with uniform compositions and without a segregation phenomenon through molten salt electrolysis, without using metal magnesium, lithium or rare-earth metal, thereby greatly shortening the production flow, simplifying the process, and reducing the production cost of the alloy.

The invention discloses a praseodymium-neodymium-iron alloy. The praseodymium-neodymium-iron alloy comprises 0-95wt% of praseodymium and neodymium and the balance iron and inevitable impurities of which the total content is less than 0.5wt%, wherein the content of oxygen is less than or equal to 0.01wt%, the content of carbon is less than or equal to 0.01wt%, the content of phosphorus is less than or equal to 0.01wt%, and the content of sulfur is less than or equal to 0.005wt%. The invention further discloses a preparation method of the praseodymium-neodymium-iron alloy. The praseodymium-neodymium-iron alloy prepared through the method is uniform in composition, small in segregation, low in impurity content, high in rare-earth yield, low in cost, and free of pollution; and the praseodymium-neodymium-iron alloy is high in rare-earth yield and remarkable in effect when applied to rare-earth steel, and is suitable for large-scale industrial production.

An electrolytic cell for aluminum electrolysis includes a cell body, in which an anode and a cathode are arranged inside the cell body, the cell body is filled with an electrolyte, and at least a part of the anode is immersed in the electrolyte; the anode is arranged above the cell body, the cathode is arranged at the bottom of the electrolytic cell and is covered by aluminum liquid, the electrolyte is located between the anode and the cathode and covers the aluminum liquid; and an insulating layer is arranged on the inner sidewall of the cell body for isolating oxygen or the electrolyte from a carbon block. The anode contains Fe and Cu as primary components; and the electrolyte is composed of 30-38 wt % of NaF, 49-60 wt % of AlF₃, 1-5 wt % of LiF, 1-6 wt % of KF and 3-6 wt % of Al₂O₃, and the molar ratio of NaF to AlF₃ is 1.0-1.52.

The invention discloses a lanthanum-cerium-iron alloy used for producing rare earth steel. The content of lanthanum-cerium is 0-95wt%, and the balance is iron and unavoidable impurities less than 0.5wt%. Oxygen≤0.01wt%. Carbon≤0.01wt%, phosphorus≤0.01wt%, sulfur≤0.005wt%. The invention also discloses a preparation method of the lanthanum-cerium-iron alloy used for producing rare earth steel. The lanthanum-cerium-iron alloy prepared by the invention has uniform composition, small segregation, low impurity content, high rare earth yield, low cost and no pollution, and is applied to rare earth steel with high rare earth yield and remarkable effect, and is suitable for large-scale industrial production.