8 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 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 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.