Abstract:
Заявленные изобретения относятся к цветной металлургии. Приготовление расплава осуществляют путем плавления меди. Расплав меди пропускают в раздаточную камеру через графит с плотностью 1,56-2,2 г/см 3 в виде перфорированного элемента при температуре 1140- 1175°С. Медь рафинируют и восстанавливают с использованием углеродсодержащего материала и повышением температуры. Формируют и вытягивают непрерывно литую заготовку и подвергают ее прокатке путем пропускания с линейной скоростью 1,5-2,5 м/сек через индукционный нагреватель, обеспечивающий высокотемпературный нагрев до 650-800°С с последующим резким охлаждением заготовки до 50-55°С. Обеспечивается получение медного сплава с пониженным содержанием кислорода.
Abstract:
A method and system for the copper anode refining is provided in which coherent jet technology is employed to heat the molten blister copper and/or melt scrap copper charges using a melting flame, oxidize the sulfur in the molten blister copper, and reduce the oxygen in the molten blister copper using top-blown coherent jet gas streams from one or more multi-functional, coherent jet lance assemblies. The present system and method employs a microprocessor-based controller operatively controlling the flow of an oxygen-containing gas, an inert gas, a reducing agent and a fuel to the coherent jet lance. The disclosed copper anode refining system and method greatly improves copper production while lowering oxidation /reduction cycle times and minimizing NO x emissions.
Abstract:
La práctica industrial de conversión de mata de cobre es la oxidación del sulfuro de hierro y posterior oxidación del sulfuro de cobre con formación de cobre blister, efectuada en convertidores Peirce-Smith u Hoboken en modo discontinuo. La presente invención resuelve dicha dificultad estableciendo continuidad operacional al proceso industrial. El método consiste en el uso de un flujo gravitacional continuo de mata de cobre a dos reactores conectados en serie por una canal, en donde la oxidación y escorifícación del hierro de la mata de cobre se efectúa en el primer reactor seguida por oxidación del sulfuro de cobre y formación de blister en el segundo reactor. Dicha operación intensiva de conversión de mata de cobre líquido ó liquido y sólido es continua utilizándose lechos empacados para incrementar la tasa de oxidación, en cada reactor, con menores tiempos de operación.
Abstract:
A novel process for refining high or low impurity blister copper containing S, As, Sb, Pb, Ni, Bi, Se, and/or Te to anode quality by means of a solution containing sulphates and alkali oxides is provided. More specifically, the process comprises the steps of (1) injecting air/O 2 gas mixtures in the presence of an alkali source, over a period of time sufficient to complete the sulphur removal stage, with the innovation of removing the SO 2 in situ, thereby forming an effective amount of a molten alkali sulphate on top of the copper bath, the temperature in the bath being maintained between 1100-1300°C; (2) adding and/or injecting molten or solid alkali sulphates together with basic oxides or carbonates into the copper bath to promote the in situ scrubbing of As and Sb into a solution containing sulphates, while the dissolved oxygen in copper increases from 0.1 to 0.6 wt%; (3) increasing the level of oxygen in the copper to remove the remaining impurities into a molten solution of Cu 2 O and/or Cu 2 O-CaO, while the molten sulphate and oxide phases co-exist as two immiscible liquid layers of slag; and (4) skimming both the sulphate and oxide slag layers prior to commencing de-oxidation.
Abstract:
Copper matte is processed to anode copper without oxidizing blister copper in an anode furnace. Copper matte, in either molten or solid form, is fed to a continuous copper converting furnace (10) in which it is converted to blister copper (14) and slag (15). The blister copper and slag collect in the settler region (13) of the furnace and separate into two phases, a blister copper phase and a slag phase (the latter floating upon the former). The converting furnace is equipped with means for stirring or agitating (17a, b, c) the interface of the blister copper and slag phases such that the sulfur content of the blister copper phase and the copper content of the slag phase are reduced.
Abstract:
A process for purifying the raw material of copper or its alloy containing at least one element selected among Pb, Ni, Sb, S, Bi and As, and further, under certain circumstances, at least one element selected among Sn, Fe and Zn as impurity metal elements, said process comprising: step 1 wherein the raw material of copper or its alloy is melted; step 2a (conducted when at least one of Sn, Fe and Zn is contained as the impurity element in the raw material) wherein the concentration of oxygen contained in the melt is increased to oxidize the Sn, Fe and/or Zn contained in the melt into slag; step 2b wherein at least one member selected from the group consisting of Fe, its oxide, Mn and its oxide is added to the melt to convert Pb, Ni, Sb, S, Bi and/or As contained in the melt into composite oxide(s) of Fe and/or Mn as slag; step 3 wherein the formed slags are removed; and step 4 wherein the resultant melt is reduced.
Abstract:
The present invention provides a method for melting copper scrap and/or refining blister copper, comprising the steps of: (a) charging of copper scrap into an empty anode furnace and melting the copper scrap; (b) charging molten blister copper into the anode furnace; (c) optionally charging more copper scrap into the anode furnace and melting the copper scrap; (d) optionally repeating steps (b) and/or (c) one or more times until the anode furnace is full and a desired amount of copper scrap has been charged and melted until a final copper batch is obtained; and (e) refining the final copper batch to obtain anode copper.