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A hydrometallurgical process for the selective recovery of silver from a solid waste material, said solid waste material deriving from waste electrical and electronic equipment and/or from exhausted Ag-based catalysts, comprises the following steps: I) Subjecting said solid material to acid leaching to dissolve said silver by using a leaching solution, wherein said leaching solution is an aqueous solution of sulphuric acid, ferric sulphate and thiourea (HS), said subjecting to acid leaching being carried out at ambient temperature and at atmospheric pressure, in a single stage or in multiple stages; filtering the exiting leaching solution and subjecting the residual solid material to washing with water; wherein said sulphuric acid, said ferric sulphate and said thiourea are contained in said leaching solution at the following concentrations: sulphuric acid 0.1-0.5 M; ferric sulphate 10-40 g/L; thiourea 10-40 g/L; II) Recovering said water used during said washing in said step I, replenishing said water with said sulphuric acid, said ferric sulphate and said thiourea and, when said subjecting to acid leaching is carried out in multiple stages, using said water as a leaching solution in said multiple stages, wherein said replenishing said water comprises adding said sulphuric acid, said ferric sulphate and said thiourea according to the following percentages compared to the dosage thereof in said step I: sulphuric acid 10-50%; ferric sulphate 80-100%; thiourea 25-50%; III) Subjecting said leaching solution exiting from said step I to electrolysis under stirring to recover said silver as metallic silver at the cathode and regenerate said thiourea; recovering said leaching solution at the end of said electrolysis; IV) Replenishing said leaching solution recovered at the end of said electrolysis in said step III con said sulphuric acid, said ferric sulphate and said thiourea, and, after said replenishing, reusing said leaching solution to treat a new solid waste material.

The plant (1) for the production of secondary zinc comprises: at least one melting assembly (2) adapted to contain a molten zinc bath (B) and to heat and melt metal residues in the form of shredded scrap and/or grain, the metal residues being composed of metallic zinc; at least one feeding assembly (3) adapted to supply the metal residues to the melting assembly (2); at least one mixing and separation assembly (4) connected to the feeding assembly (3) and associated with the melting assembly (2) and adapted to receive the metal residues, mixing them in the molten zinc bath and to move the process scraps away from the melting assembly (2); at least one pick-up assembly (5) adapted to transfer molten zinc from the melting assembly (2) to a machine for forming secondary solid zinc.

本实用新型公开了一种钛合金材料的循环淬火装置，包括一号水箱，一号水箱的左侧设有二号水箱，一号水箱与二号水箱之间通过连接水管连接，二号水箱与一号水箱内分别设有能够上下移动的托取料架，托取料架的顶部能够放置钛合金制品，托取料架上升至最高点的时候，托取料架的顶部能够与一号水箱的顶部相平齐，在二号水箱与一号水箱之间还连通有循环水管一、循环水管二，循环水管一上串联有二号循环水泵。循环水管二上串联有一号循环水泵。通过循环水管一、循环水管二、连接水管将二号水箱、一号水箱的淬火介质循环起来，形成淬火介质的循环流动，循环流动的淬火介质能够使钛合金材料在淬火过程中均匀冷却。

The invention relates to a method for separating cathode constituents from used rechargeable lithium Li(RLIB) batteries. According to the invention, when the cathodes contain multi-walled carbon nanotubes (CNT) (MWNT) functionalized with polyphenyldiamine (PDPA), MWNP grafted with carboxylic groups (MWNT-COOH), (CNT-Li+), polyvinylidene fluoride (PVDF), Super-P carbon, Li, constă în etapele: i) interacţii succesive cu apă pentru eliminarea sărurilor anorganice, ii) solubilizarea compuşilor macromoleculari în N-metil-pirolidonă (NMP) şi filtrarea PVDF şi a MWNT funcţionalizate cu PDPA, iii) interacţia compuşilor MWNT-COOH, MWNT şi carbon Super-P cu hidrazine rezultând amestec de MWNT şi carbon Super-P.

一种回转窑焙烧‑还原一体化镁冶金装置及方法，属于镁冶金技术领域，装置包括沿物料流向依次连通的焙烧回转窑段、料封斜管、还原回转窑段、卸渣储料段和冷凝管，还原回转窑段的进料端还连通有液态还原剂储存罐，第一驱动电机通过第一传动机构驱动焙烧回转窑段转动，第二驱动电机通过第二传动机构驱动还原回转窑段转动；还原回转窑段的内部设置有复合辊轮，复合辊轮由同心剪切强化混合筒与内置的中间储液槽同轴组成，复合辊轮的两端分别设置有轮子，两端轮子分别支撑于还原回转窑段炉腔内部滚动接触，其中一端轮子滚动接触于还原回转窑段的出料端端面。装置连续封闭性好，能耗低，还原时间缩短至1.5小时，为镁冶金提供了工业化解决方案。

本发明涉及铝合金淬火技术领域，且公开了一种6A05铝合金淬火方法及装置，包括淬火箱、曝气管、驱动件与刮料件；淬火箱内开设有淬火腔，曝气管竖直设置在淬火腔内并受驱动件驱使旋转，曝气管上固定套装有位于淬火腔下部区域的固定盘，曝气管上套装有至少两组并位于固定盘上方的环形分隔件，且环形分隔件用于对工件进行分隔；固定盘上安装有多个周向布置并对杂质磁性吸附的搅动磁吸件。本发明通过旋转固定盘带动铝合金型材自转，消除工件间热量积聚，实现均匀冷却，曝气管通入气体产生气泡扰动水流，配合持续换水，加速热交换并促进杂质脱落，固定盘外周设置搅动磁吸件吸附铁屑，配合刮料件自动清理，实现杂质连续去除，保障淬火质量。

[Problem] To provide a method for producing sintered ore that suppresses a decrease in the yield of the finished product in the lower layer of the sintered layer. [Solution] In a Dwight-Royd type sintering machine, in a sintered strand that is subjected to downward suction by a wind box, the length L in the strand direction is defined as the distance from a first position at the downstream end of the ignition furnace to a second position at the end of the wind box closest to the ore discharge section, and when the first position is defined as 0 and the second position as L, the method for producing sintered ore is characterized by making the suction negative pressure in the range from 0.75L to L smaller than the suction negative pressure in the range from 0.25L to 0.75L. [Selected Figure] Figure 1

本发明属于金属层状复合材料制备技术领域，提供一种铝基层状金属复合板界面与基体协同强化制备方法，包括对金属板和可热处理强化铝合金板的待复合面打磨粗糙；将可热处理强化铝合金板加热至其固溶温度区间并保温；将加热后的可热处理强化铝合金板与金属板组坯，经轧机制备出预复合板；将预复合板整体加热至铝合金固溶温度区间，高速热轧后进行淬火处理；将淬火后的铝基层状金属复合板进行低温时效处理，随后自然冷却至室温；将冷却后的复合板经矫直和切边处理，获得最终态复合板。本发明有效解决了铝合金基体固溶强化与界面结合性能增强之间的矛盾，实现了高强铝基层状金属复合板的制备。

本发明公开了一种GH4169合金梯度复合结构的制备方法及构件，涉及金属材料的表面改性及热处理技术领域，其技术方案要点是：对GH4169合金进行固溶处理；进行预时效处理，以在合金中形成弥散的预析出强化相；进行表面超声滚压处理，利用预析出强化相作为变形障碍，在合金表层引入高密度缺陷与梯度纳米结构；进行补充时效处理，利用梯度纳米结构中的缺陷作为异质形核点，促使析出相弥散析出并与梯度纳米结构产生协同强化效应，在合金表层形成梯度复合强化层。本发明实现了远超单一工艺简单叠加的协同强化效应，使GH4169合金的表层硬度相较于传统完全时效态获得约20%的显著提升，同时保持了材料必要的承载能力。