15 results about "Liquation" patented technology

The invention relates to the field of ferrous metallurgy, in particular to high-purity, high-homogeneity and fully-quenched GCr20MnMoRE rare earth bearing steel for a large cylindrical roller and a preparation method of the high-purity, high-homogeneity and fully-quenched GCr20MnMoRE rare earth bearing steel. The alloy comprises the following components in percentage by weight: 0.90 to 1.20 percent of C, 0.10 to 0.60 percent of Si, 0.60 to 1.20 percent of Mn, 1.60 to 2.20 percent of Cr, 0.40 to 1.0 percent of Mo, 0.10 to 0.50 percent of Ni, 0.005 to 0.020 percent of RE and the balance of Fe and inevitable impurities. According to the rare earth alloy steel for the large cylindrical roller, through RE + Mo co-alloying, molten steel purification and inclusion modification, liquation is avoided, and the hardenability is improved, so that network carbide, structure consistency and hardness uniformity are controlled. Moreover, the high-purity, high-homogeneity and full-through-quenching large cylindrical roller is obtained through the process technologies of purification smelting, rare earth deep deoxidation, airtight protection pouring, low-oxygen secondary remelting, high-temperature homogenization, uniform large deformation, forging rolling rapid cooling, efficient spheroidizing annealing, isothermal salt bath isothermal quenching, multiple gradient tempering and the like.

The invention discloses a method for treating and recycling valuable metals from ITO target carbon thermal reduction waste residues, and belongs to the technical field of resource recycling. The method comprises the following steps: (1) grinding the ITO target carbon thermal reduction waste residue to obtain waste residue powder; (2) uniformly mixing the iron oxide with the waste residue powder, heating the mixture under a vacuum condition, and reacting the mixture to obtain a reaction product; (3) the reaction product is subjected to liquation treatment, and indium-rich tin alloy and iron-containing residues are obtained; and (4) carrying out graded vacuum distillation on the indium-rich tin alloy to obtain crude tin and crude indium products. According to the method, the introduced iron oxide has the effects of catalytic oxidation and phase separation and enrichment of valuable metals in the residues in the reaction process of the ITO target carbon thermal reduction waste residues, and on the basis of high environmental friendliness and low cost, the'wrapping-dispersing 'structure in the waste residues is effectively broken, so that the reduction thoroughness of indium and tin metals in the waste residues is improved, and the recovery rate of the indium and tin metals in the waste residues is increased. And the indium and tin metal separation recovery rate is improved.

The invention relates to the field of lead flash smelting in pyrometallurgy, and discloses a flash lead smelting process matched with treatment of copper concentrate, which comprises the following steps: mixing copper concentrate and lead concentrate for flash smelting, and forming a lead-copper mixed melt after oxidation and reduction reaction; adding a vulcanizing agent to liquate and remove copper by utilizing the principle that the solubility of copper in the lead liquid is reduced along with the reduction of the temperature, so as to generate co-melt lead matte mainly comprising sulfides such as lead sulfide and copper sulfide; according to the process method, the mixed furnace charge containing 20-50% of lead and 0.5-5% of copper can be treated, a high-benefit lead matte product is directly produced in the flash lead smelting process, and a new benefit growth point is created for lead smelting enterprises.

The invention discloses a method for improving the non-uniformity of high-hardenability silicon-manganese bearing steel GCr15SiMn carbides, and relates to the technical field of metallurgy, and the method comprises the following steps: controlling the superheat degree of a continuous casting process to be 20-35 DEG C, controlling the pulling speed to be 0.54-0.57 m / min, and controlling the soft reduction at the solidification tail end of a casting blank to be 13-15 mm. The casting temperature, the pulling speed and the solidification tail end rolling reduction in the continuous casting procedure are controlled, and the reasonable high-temperature heating time is set in the steel rolling procedure, so that the carbide nonuniformity of the rolled metal core part is greatly improved, and the carbide banding is effectively controlled to be smaller than or equal to 2.0 grades, the carbide network is effectively controlled to be smaller than or equal to 2.0 grades, and the carbide liquation is effectively controlled to be smaller than or equal to 0 grades.

The invention relates to the technical field of zinc smelting, and discloses a direct zinc smelting technology and device for a low-grade complex zinc oxide material, and the direct zinc smelting technology comprises the steps of value-added mixing, uniform mixing and drying, reducing agent drying, normal-pressure melting and purifying, strengthened reduction zinc smelting, crude zinc liquid liquation and ingot casting. The low-grade zinc oxide ore, the high-impurity steel colored zinc-containing dust and the like are directly used for producing metal zinc and lead, the efficient utilization space of low-grade inferior zinc-containing resources is opened, the production process is short, the investment and operation cost is low, full-resource utilization is achieved, the energy utilization rate is high, energy consumption is low, and environmental protection and cleanliness are achieved.

The invention relates to a method for producing refined antimony through electrolysis of a high-copper-lead-antimony alloy, and belongs to the technical field of metallurgical engineering. The method comprises the following steps that (1) the high-copper-lead-antimony alloy is subjected to liquation to remove copper; the copper-removed lead-antimony alloy is obtained; (2) carrying out vacuum distillation on the copper-removed lead-antimony alloy to obtain a residual silver alloy, a volatile matter lead-antimony-bismuth alloy and a furnace wall attachment arsenic-antimony alloy; the residue is silver alloy and is conveyed to a silver recovery system to recover silver; (3) the volatile matter is subjected to primary electrolysis, and crude antimony and primary electrolytic antimony anode slime are obtained; and (4) the crude antimony is subjected to secondary electrolysis, and refined antimony and secondary electrolytic antimony anode slime are obtained. According to the method, the refined antimony can be directly obtained by utilizing the high-copper-lead-antimony alloy, and the method is environment-friendly, energy-saving, short in process and simple and convenient to operate, so that the method is more convenient for industrial popularization and application.

The invention provides a cold-rolled working roll and a preparation method thereof, and relates to the technical field of forging, the preparation method of the cold-rolled working roll comprises the following steps: heating a steel ingot to 1190-1210 DEG C, preserving heat for 9-11 hours, and then performing first upsetting and drawing to obtain a first intermediate forging; the first intermediate forge piece is heated to 1190-1210 DEG C, heat preservation is conducted for 9-11 h, then secondary upsetting and drawing are conducted, and a second intermediate forge piece is obtained; the second intermediate forge piece steel ingot is heated to 1170-1180 DEG C, heat preservation is conducted for 7-8 h, then third upsetting and drawing are conducted, and a third intermediate forge piece is obtained; and performing post-forging heat treatment on the third intermediate forge piece to obtain the cold-rolled working roll. By adopting the preparation method disclosed by the invention, the formation of meshy or chain-distributed liquation carbides in the cold rolling working roll can be avoided.

The invention belongs to the technical field of metallurgical processes, and particularly relates to a tin hard head liquation refining process which comprises the following steps: step 1, adding solid tin hard heads into lead alloy liquid in batches, stirring, controlling the temperature of the lead alloy liquid to be 610-680 DEG C during stirring, stopping stirring after the tin hard heads are granular or powdery, and fishing out dross to obtain crude tin liquid; step 2, performing condensation to remove iron and arsenic; and step 3, removing iron and copper after arsenic is qualified. According to the method, the metal high-temperature liquation technology is adopted, the crude tin is separated out from the tin hard head, the process that in the traditional process, after crushing, the tin slag is matched for secondary furnace feeding is replaced, and the problems that in the traditional process, melting is difficult, the period is long, and the tin yield is low are solved.

The invention discloses a precipitation strengthening type cast high-temperature alloy heap-welded joint and a composite welding manufacturing method for reducing liquidation crack sensitivity, and belongs to the technical field of welding, and the method comprises the following steps: firstly, carrying out solid solution slow cooling and heating treatment on a casting alloy, and then, carrying out brazing on the casting alloy by using nickel-based brazing filler metal, and finally, surfacing welding is conducted on the brazing layer through a welding material, and the precipitation strengthening type cast high-temperature alloy surfacing welding joint is obtained. The structure and the performance of the surface layer / secondary surface layer of the welding part of the casting can be effectively improved through brazing and melting surfacing, double isolation layers of a brazing layer and a surfacing layer are formed, and the resistance of the brazing layer and the surfacing layer to welding hot cracks is improved; meanwhile, due to the fact that the brazing temperature is low, the residual stress of the formed brazed / surfaced joint is small, the sensitivity of welding liquefaction cracks is finally reduced, and a fusion welding joint with good quality is formed.

The invention relates to long-life bearing steel, and belongs to the field of iron-based alloys. The microcosmic brittle inclusions of the bearing steel meet the conditions that the B fine system is less than or equal to 1.5 grade, the B coarse system is less than or equal to 1.0 grade, the D fine system is less than or equal to 1.0 grade, the D coarse system is less than or equal to 1.0 grade, and the DS system is less than or equal to 1.0 grade; the total ultrasonic defect index does not exceed 5mm / dm < 3 >, and the maximum length of a single ultrasonic defect does not exceed 2mm; the macrostructure meets the conditions that the center porosity is smaller than or equal to 1.0 level, the general porosity is smaller than or equal to 1.0 level, the ingot segregation is smaller than or equal to 1.0 level, and the center segregation is smaller than or equal to 1.0 level; a metallographic method is adopted to detect that no microscopic gap exists; a metallographic method is adopted to detect that carbide liquation is smaller than or equal to 0 grade, carbide banding is smaller than or equal to 2.0 grade, and carbide netlike is smaller than or equal to 2.5 grade. The end quenching J1.5 is greater than or equal to 62HRC, and the core impact performance AKU is greater than or equal to 80J. The steel is formed by rolling a blank produced by a continuous casting process, an electroslag remelting production process can be replaced, and the production cost is reduced.

The present invention relates to a steel for high-speed EMU axle box bearings and a production method thereof, belonging to the technical field of iron-based alloys. The chemical composition of the steel, by mass percentage, is as follows: C: 0.95 - 1.05%, Si: ≤0.10%, Mn: 0.25 - 0.35%, Cr: 1.35 - 1.60%, Mo: ≤0.10%, Ni: 0.20 - 0.25%, Al ≤0.05%, P ≤0.005%, S ≤0.0005%, Cu ≤0.20%, Ca ≤0.0010%, Ti ≤0.0010%, O ≤0.0005%, and the balance is Fe and inevitable impurities. The microscopic brittle inclusions meet the following requirements: B fine series ≤1.0 grade, B coarse series ≤0.5 grade, D fine series ≤1.0 grade, D coarse series ≤0.5 grade, DS series ≤1.0 grade; the carbide network in the structure ≤2.0 grade, the carbide banding ≤2.0 grade, and there is no carbide liquation and microscopic pores. The production process: primary melting and first refining → secondary secondary refining outside the furnace → tertiary secondary refining outside the furnace → vacuum degassing → continuous casting → continuous rolling.

The invention provides a method for treating precious lead in a short process, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps: firstly, heating and melting precious metal to obtain molten slag, molten alloy and antimony-containing soot; conveying the obtained molten slag bismuth to a crude bismuth smelting process, conveying the obtained antimony-containing soot and the antimony-containing soot obtained in the oxidation blowing process to a crude antimony smelting process, and carrying out oxidation blowing-liquation copper removal-agent addition tellurium removal processes on the obtained molten alloy to obtain a silver-bismuth-lead alloy; and distilling the silver-bismuth-lead alloy in a vacuum furnace to obtain crude silver. Compared with the prior art, the process has the advantages that valuable elements are efficiently separated, the production processes of various materials are reduced, rare and precious metals dispersed due to too long steps are reduced, efficient extraction and utilization of the valuable rare and precious metals in the precious lead smelting process are promoted, and the recovery rate of Bi is increased from 83.34% to 91% or above; the Sb recovery rate is increased from 82.54% to 85% or above; and the recovery rate of Ag is increased from 98.63% to 99% or above.

The invention provides an inspection method for liquefaction cracks in a welding heat affected zone of a high-temperature alloy, and belongs to the technical field of material welding. The problems of inaccurate detection technology, low efficiency and high cost are solved. The method comprises the steps of inspection surface determination, bending sample preparation and test method and result evaluation. The method can effectively identify the liquefied crack and quantitatively evaluate the sensitivity of the liquefied crack. The detection method is suitable for various welding structures, can effectively detect the welding quality, is also suitable for various welding methods of single-pass welding and multi-layer multi-pass welding and covers common welding joint forms, and base metal can be pipes or plates. The beveled sample prepared by the method comprises all sections which are easy to generate heat affected zone liquefaction cracks in the length and depth directions of a welding seam; the inspection and detection method provided by the invention can be used for qualitatively and quantitatively characterizing the liquefaction cracking degree, is simple to operate and rapid to inspect, and has lower requirements on professional skills of inspectors.

The invention discloses a method for recycling zinc slag of a hot-dip galvanizing line, and relates to the technical field of hot-dip galvanizing and aluminum. The method comprises the following steps: firstly, feeding a zinc-plating slag raw material into a resistance heating melting furnace; a resistance heating melting furnace is opened, the zinc plating slag is melted into metal iron slag and a zinc-aluminum alloy melt, and the metal iron slag is not melted; the obtained alloy melt is discharged into a liquation pool; discharging the obtained zinc-aluminum alloy liquid; the obtained zinc-aluminum alloy block enters a replacement pool, and the replacement pool is internally filled with a FeSO4 solution in advance; the obtained mixed solution of the Al2 (SO4) 3 solution and the ZnSO4 solution is filtered and then added into an electrolytic tank, a lead plate serves as a cathode, and an aluminum plate serves as an anode; according to the method, the metal zinc deposited on the aluminum plate is stripped, the metal zinc in the zinc plating slag can be separated from the metal iron and the metal aluminum, the metal zinc is effectively recycled, the process is simple, the energy consumption and the processing cost are low, the production can be continuous, and the production efficiency is high.