137results about How to "Simple smelting process" patented technology

This invention relates to a method for smelting low-phosphorus stainless steel base material from nickel and chrome-containing low-grade limonite. The method comprises: (1) pre-treating nickel and chrome-containing low-grade limonite via sieving, pulverizing and drying to obtain ore powder and ore blocks with different particle sizes, and mixing with fuel and flux to obtain sinter ore; (2) mixing various dedusted ashes, sintered return fines, and ore powder with an adhesive and a reductant, and passing into cold-pressed balls or carbon-containing balls under high pressure; (3) drying the carbon-containing balls, adding into a converter, and reducing to obtain pre-reduced balls; (4) mixing the sinter ore with partial ore blocks, the cold-pressed balls, the carbon-containing balls, the pre-reduced balls, the fuel, the flux and auxiliary materials, and smelting in a blast furnace to obtain molten nickel and chrome-containing alloy or molten iron; (5) mixing with the cold-pressed balls, the carbon-containing balls and the pre-reduced balls, and smelting in an electric furnace or a converter to reduce, decarbonizes, dephosphorize and obtain clean molten stainless steel base material that can be directly used in steel making; (6) casting with a continuous caster to obtain solid stainless steel base material that can be directly used in steel making. The method has such advantages as low cost, little pollution, abundant raw materials, high recovery rate of alloy elements, and few harmful elements.

The invention discloses a method for extracting cobalt and nickel from laterite-nickel ore, which comprises the following steps of: performing roasting preprocessing on the laterite-nickel ore; blending the roasted material with water to obtain pulp; directly adding ion exchange resin for leaching and adsorbing the nickel and cobalt; separating the ion exchange resin from the ore pulp; eluting the nickel and cobalt in the resin by using acid; and separating nickel from cobalt in eluent by using a solvent extraction method, wherein the obtained nickel-containing solution and cobalt-containing solution are directly electrolyzed for producing metal nickel and metal cobalt, or producing corresponding salts of nickel and cobalt. By the method, a melting process for recovering cobalt and nickelfrom laterite-nickel ore through a wet process is simplified, a plurality of flows such as leaching, impurity removal, enrichment and the like of the nickel and cobalt of the laterite-nickel ore are integrated in a procedure, steps of solid-liquid separation and slag washing are not needed, water consumption, ore pulp treatment capacity and subsequent wastewater treatment capacity are reduced, the recovery rate of the nickel and cobalt in the process is high, the method is easy to implement, equipment investment cost can be saved, and chemical material consumption and multiple operation management links can be reduced.

A aluminum alloy material consists of Si 9.5-11.5wt%, Cu 2.0-3.0wt%, Mg 0.3-0.4wt%, mixed rare earth RE 0.1-0.3wt%, Mn is less than or equal to 0.5, Zn is less than or equal to 1.0, Fe is less than or equal to 1.0, Al residue. The mixed rare earth RE consists of La 5-80wt%, Ce 5-40wt%, Nd 1-20wt%, Y 1-20wt%, Pr 1-20wt%. It achieves good flowing, mechanical and cutting machining performance.

The invention discloses a smelting method for low-carbon low-silicon wire-welding steel. The process flow of the smelting method comprises the following procedures: pretreatment and desulphurization of molten iron; treatment in a converter; LF refining; and continuous casting of small square billet with a size of 150 mm * 150 mm. With the smelting method, carbon content is stably controlled to be less than or equal to 0.08%; silicon content is stably controlled to be less than or equal to 0.027%; total oxygen content is no more than 0.0040%; the problem of nozzle clogging is overcome; and surface and internal quality of a casting blank is greatly improved. The process flow of the smelting method is simple and has low cost; and equipment used in the smelting method is conventional production equipment for iron and steel manufacture, is simple to operate, has good versatility and saves energy.

The magnesium alloy electromagnetic low-temp. semicontinuous casting method includes the steps of melting magnesium, adding compound fire-resisting elements, adding alloy elements, heat-insulating, standing still and semicontinuous casting under the electromagnetic field. It utilizes the addition of compound fire-resisting elements to implement smelting of magnesium alloy free from coverage or protection so as to shorten technological process and raise melt quality, and utilizes the application of electromagnetic field and optimization of crystallizer structure to implement the low-temp. and high-speed semicontinuous casting of magnesium alloy.

The invention provides corrosion-resisting stainless steel and a manufacturing process of the corrosion-resisting stainless steel. The corrosion-resisting stainless steel comprises the following chemical components in percentage by weight: less than 0.10% of C, 15-22% of Cr, 0.6-3.0% of Mo, 9.0-10.5% of Ni, 0.40-2.0% of B, less than 0.5% of Cu, less than 1% of Si, less than 0.9% of Mn, 0.2-0.6% of Ti, less than 0.3% of Al, less than 0.05% of N, less than 0.04% of P, less than 0.01% of S and inevitable impurity elements. Therefore, the corrosion-resisting stainless steel has higher hot and cold fatigue resistance, anti-fracture toughness, thermal shock resistance, good hot-working property, and welding performance; the smelting process is simple; and the processing cost is low.

The invention discloses a low-alloy cast steel suitable for a heavy lorry axle housing. The low-alloy cast steel comprises the following elements in percentage by mass: 0.23 to 0.33 percent of C, 0.50 to 1.00 percent of Si, 0.90 to 1.40 percent of Mn, 0.10 to 0.25 percent of Cr, 0.10 to 0.25 percent of Mo, 0.20 to 0.25 percent of V, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S, less than or equal to 0.20 percent of residual elements, and the balance of Fe. Waste steel, pig iron, ferromanganese alloy, silicon ferromanganese alloy, ferrochromium alloy, ferromolybdenum alloy and ferrovanadium alloy are used as raw materials of the low-alloy cast steel; and the machining process of the low-alloy cast steel comprises casting and thermal treatment. The low-alloy cast steel has the advantages of high mechanical property, good low-temperature impact toughness and good casting and machining process properties, and is particularly suitable for producing the lorry axle housing.

The invention discloses a high titanium special welding wire steel smelting method, the technical process of converter-ladle furnace (LF) refining-150 mm*150 mm small square billet continuous casting is used, the titanium content is stably controlled at 0.14% to 0.19%, on average, 0.16%; carbon content is stably controlled at 0.03-0.08%; the total oxygen content is stably controlled at 0.0030% or less, nozzle clogging problem is successfully solved, the number of furnaces of continuous casting can reach 22, welding wire welding performance is good, splash is greatly reduced, and the demand of a high-end welding wire material can be achieved. The high titanium special welding wire steel smelting method adopts steel manufacture conventional production equipment, and is simple in operation and strong in commonality, casting blank quality is stable, and the production cost is low.

The invention discloses a steel plate with excellent low-temperature toughness in a large heat-input weld heat affected zone, which comprises the following chemical components in percentage by weight: 0.03-0.06% of C, 0.05-0.12% of Si, 1.30-1.60% of Mn, 0.007-0.015% of Nb, 0.007-0.015% of Ti, at most 0.01% of Al, 0.0035-0.0060% of N, at most 0.009% of P, at most 0.0052% of S and the balance of Fe and inevitable impurities. The invention adopts a low-C low-Si low-Al high-Mn-Nb microalloy composition, and the Ti/N ratio is 2.0-3.0. The production method adopts an advanced TMCP-AcC technique, so that the steel plate microstructure is an acicular ferrite of which the dimension is at most 10 mu m, and has excellent strength and low-temperature toughness; under the condition that the weld heat input is up to 200kJ/cm, the Charpy impact work of the weld heat affected zone at -20 DEG C is at least 179J; and the invention is applicable to ships, low-temperature pressure containers, ocean platforms and the like.

The invention relates to a method for tungsten hydrometallurgy, in particular to a method for preprocessing scheelite and preparing ferro-tungsten. The method comprises the following steps: preprocessing scheelite with hydrochloric acid and repeatedly utilizing remaining acid to decompose scheelite in an aright device having no pressure; and preprocessing slag to restore melting ferro-tungsten. Compared with the prior art, the method has the advantages as follows: in order to solve the defects in the background art, the closed circuit of hydrochloric acid is utilized to decompose scheelite, thereby reducing the consumption amount of hydrochloric acid and energy consumption, realizing the effective enrichment of CaCl2, reducing the production cost of subsidiary products, and improving the economic benefits of technology; the aright device having no pressure reduces the requirements on leaching equipment, and also reduces the investment of fixed assets; high-qualified ferro-tungsten can be prepared under the hydrogen reduction environment by just mixing iron powder and coarse tungstic acid according to a proper proportion, so that the energy consumption is reduced and the smelting process is simplified.

The invention relates to a low-cost high-compression-strength wrought magnesium alloy and a preparation method thereof. The magnesium alloy material is composed of six elements, namely Mg, Zn, Mn, Sn,Ca and Cu, wherein the content of the Zn element is 4.0%-8.5%, the content of the Mn element is 0.1%-0.4%, the content of the Sn element is 0.1%-0.4%, the content of the Ca element is 0.1%-0.4%, thecontent of the Cu element is 0.1%-0.4%, the content of inevitable impurities is less than or equal to 0.15%, and the balance is the Mg; and compared with a traditional commercial grade magnesium alloymaterial, high compressive yield strength can be obtained after the magnesium alloy material is subjected to a conventional extrusion treatment, and the compressive yield strength of the alloy is obviously higher than tensile yield strength. The magnesium alloy material does not contain precious alloy elements, and is simple in preparation process and low in cost, has very important practical value for manufacturing a pressed magnesium alloy component.

The invention provides an aluminum chip recovery and smelting process. The process is to perform screening, crushing, oil removal, drying, iron separation, preheating and melting on recovered waste aluminum in sequence to obtain recovered molten aluminum; and the specific steps are as follows: the recovered aluminum is vibrated and screened for crushing; then, an oil remover is used for oil removal and drying; iron is separated; and separated aluminum chips are preheated to enter a smelting furnace for smelting to obtain the recovered molten aluminum. The aluminum chip recovery and smelting process is simple and low in energy consumption, can recycle high-temperature waste gas generated in the process to achieve the purposes of energy conservation and emission reduction, and meanwhile, canshorten the smelting time to further reduce the energy investment.

A low-smelting-point non-lead SnZn-alloy solder is prepared from Zn (5-9 wt.%), Bi (0.5-4), Nd (0.01-0.5) and Sn (rest). Its solder paste features that the Sn or Sn-alloy particles are coated on the surface of each solder particle for high stability and high antioxidizing power.

The invention discloses a low-cooling-rate sensitive high-nucleation-capacity AlNbTiBRE composite refining modifier used for aluminum alloy and a preparation method of the low-cooling-rate sensitive high-nucleation-capacity AlNbTiBRE composite refining modifier used for aluminum alloy. The low-cooling-rate sensitive high-nucleation-capacity AlNbTiBRE composite refining modifier is prepared from Al-xNb-yTi-zB-kRE, wherein 0.01<x<=6wt%, 0.01<y<=6wt%, 0.01<z<=1wt%, 0.01<k<=1wt%, and the balance is Al; and RE is one of La, Ce, Nd, Er, Gd, Y, Yb and Sc or a mixture of two or more of La, Ce, Nd, Er, Gd, Y, Yb and Sc. A preparation technology is simple, and the compositions can be precisely controlled. The composite refining modifier is used for processing aluminum alloy, and the refining effect and the modifying effect are excellent; for all parts of castings complex in shape and different in thickness, namely, all parts with different cooling rates, the cooling rate sensitivity of the refining effect is low; and the mechanical performance of the obtained alloy is remarkably improved, and the performance difference between the parts with different cooling rates is remarkably reduced.

The invention provides a method for preparing high-strength and toughness magnesium alloy containing an LPSO structure through magnetic field casting regulation. The method comprises the following steps: atoms RE and atoms Zn are proportioned in a certain amount of Mg-Re-Zn alloy, and the Mg-Re-Zn alloys are put into a crucible at a certain temperature for melting; after all the alloy raw materials are molten, the molten materials are heated to 700-740deg C and is casted into a graphite mould under a magnetic field condition, and a Mg-RE-Zn casting ingot is obtained; and the Mg-RE-Zn casting ingot is subjected to solid solution and then subjected to quenching treatment, and a magnetic field casting Mg-RE-Zn alloy with a nano-scale lamellar LPSO structure is obtained. The structure of the alloy is regulated by changing the current and frequency of the pulsed magnetic field during casting the molten alloy in the specially-made graphite mould and the temperature and time of the subsequent solid solution treatment, and the nano-scale lamellar LPSO structure of the high-toughness magnesium alloy is prepared in the Mg-RE-Zn casting alloy for the first time.

The invention discloses a TC4 titanium alloy solid welding wire for large-thickness ultra-narrow-gap laser wire filling welding and a preparation method thereof. The invention belongs to the technical field of welding materials. The invention provides the TC4 titanium alloy solid welding wire for large-thickness ultra-narrow-gap laser wire filling welding and the preparation method thereof. The solid welding wire is prepared from chemical components in percentage by mass as follows: 5.0%-7.0% of Al, 4.0%-6.0% of V, 1.5%-2.5% of Mo, 0.2%-0.5% of Cr, 0.5%-1.5% of Zr and the balance of Ti. The method comprises the following steps: weighing raw materials according to the chemical components of the welding wire, mixing the raw materials, pressing into an electrode block, welding into a consumable electrode, carrying out primary smelting to obtain a primary cast ingot, carrying out secondary smelting to obtain a titanium alloy cast ingot, turning a skin, cutting a dead head, forging into a square billet, rolling, drawing, straightening and polishing to obtain a wire material, carrying out vacuum annealing, carrying out drawing diameter reduction, stress relief annealing and cleaning in a vacuum tube type annealing furnace, winding on a wire reel, and vacuum plastic packaging to obtain the large-thickness ultra-narrow-gap TC4 titanium alloy solid welding wire for laser wire filling welding.

The invention relates to a novel amorphous nanocrystalline high-entropy soft magnetic alloy and a preparation method thereof. The chemical formula of the alloy is FeaCobNicZrdBeCuf, wherein a, b, c, d, e and f in the chemical formula represent the atomic percentage contents of the corresponding components and meet the following conditions that a is 25-35, b is 25-35, c is 25-35, d is 6.0-8.0, e is1.0-5.0, f is 0.5-1.5, and the sum of a, b, c, d, e and f is 100. The novel amorphous nanocrystalline high-entropy soft magnetic alloy has the advantages of being excellent in magnetic performance, low in cost and good in formability, and the preparation process conditions are loose and simple.

The invention discloses manganese and boron series low-carbon microalloy high-strength non-quenched and tempered steel and a production method thereof. The non-quenched and tempered steel comprises the following chemical components in percentage by weight: 0.17 to 0.25 percent of C, 0.80 to 1.20 percent of Si, 1.60 to 2.50 percent of Mn, 0.08 to 0.15 percent of V, 0.015 to 0.10 percent of Nb, 0.01 to 0.06 percent of Ti, 0.015 to 0.05 percent of Al, 0.0005 to 0.005 percent of B and the balance of Fe and inevitable impurities, wherein the total percentage of impurity elements is less than 0.05 percent. Elements, such as N, RE, Ca, Zr and the like, which are not easy to control in a smelting process, are not required to be added into the steel, and a quenching and tempering procedure is eliminated, so that the production process is simplified, the production efficiency is improved, and the production cost is reduced.

The invention belongs to the field of metal materials, and relates to an iron-based soft-magnet amorphous alloy with less components, low cost and high saturation magnetic induction intensity and a manufacturing process thereof. The iron-based soft-magnet amorphous alloy is prepared from the following components in atom percentage: greater than or equal to 5 percent and less than or equal to 12 percent of boron, greater than or equal to 3 percent and less than or equal to 10 percent of phosphorus, greater than or equal to 0.5 percent and less than or equal to 5 percent of tin, and greater than or equal to 80 percent and less than or equal to 84.5 percent of iron. The iron-based soft-magnet amorphous alloy is low in production cost, and is simple in process; the prepared iron-based soft-magnet amorphous alloy has the characteristics of high saturation magnetic induction intensity and low coercive force, is suitable for devices such as transformer cores, amorphous motors and the like, and is applied to the field of electric power, electronics, information, communication and the like.