DE217046C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

. CLASS 40 «. GROUP

of copper as metal.

Patented in the German Empire on May 7, 1908.

The lead copper stones (lead stones) and lead sulphide stones obtained from lead work Copper ores with similar contents of lead and copper have hitherto been the most common Process roughly processed in the following way: The lead stone with a content from about 10 to 15 percent lead and up to 15 percent copper was a partial Subjected to roasting and then in the shaft oven on lead and concentrated stone merged. This was achieved, if necessary by repeating the partial Roasting and the shaft furnace melting, a stone with about 30 to 40 percent Copper and 8 to 15 percent lead (concentration stone) . This concentration stone was processed either in the Way that by repeated partial roasting and melting in a shaft furnace, so-called. Spectacle ovens, which Stein brought to a higher concentration, and finally on the one hand a lead black copper, so-called alloy with a content of 60 to 75 percent Copper and 20 to 30 percent lead, and partly to obtain a copper stone that is purer to lead. The lead-rich black copper is made by melting it in the furnace and blowing it on top freed from the wind from the lead, resulting in large losses of lead and silver, while from the lead purer copper stone through further roasting and melting an ordinary black copper is extracted (cf. Schnabel, Handbuch der Metallurgy, 1901, Volume 1, p. 543), Or the processing of the lead concentration stone takes place in such a way that one from it through several roasting and melting in the flame furnace a trace stone Produces 66 to 73 percent copper and 6 to 10 percent lead. This trace stone is in the flame furnace exposed to an oxidizing atmosphere, producing copper oxide, which is mixed with that remaining in the mass Copper sulfide converts with precipitation of metallic copper, or it becomes the Ground trace stone is partly roasted to death and the roasted material is raw with another part Spursteins melted down directly.

As can be seen, the processing of lead copper stones according to the above-described working methods is not only associated with considerable costs (as a result of high expenses for wages, coal, etc.) and difficulties, but must also result in significant metal losses _; -.

The aim of the present method is now to be bypassed in a much simpler manner the repeated roasting required with the previous processing methods and melting and avoiding metal losses as much as possible, from impure Stones and ores to excrete almost all lead and other impurities and to extract lead-pure copper. The Invention

Claims (3)

generation is based on the combination and appropriate application of two metallurgical operations that are known per se. The first of these operations is that the impure copper stone is subjected to a partial disarmament according to a process known per se by blowing in the solid (granular to powdery!) State (for example in converters like those used in the Huntington-Heberlein process) with sintering . In this roasting process, according to the present invention, silica must be present, which in itself is not new and has already been proposed earlier for the purpose of increasing the sinterability of the roasted material or making the addition of silica unnecessary during the subsequent melting in the shaft furnace. According to the present invention, the acid content of the silica is measured in such a way that all of the lead contained in the material is converted into lead silicate during sintering. Appropriate amounts of quartz-containing aggregates or ores are therefore mixed with the stone before it is blown. The second phase of the present process consists in melting the roasting material resulting from the blowing work, which contains all lead in the form of silicate and the copper partly in the form of oxide or metal, partly in the form of sulfide, in a known manner in a furnace . During this melting in the furnace, the copper is deposited as metal in a known manner through the reaction between the copper sulfide and the copper oxide, while all the lead goes into the slag. Since the lead is present in the molten mass as silicate, it cannot be deposited in metallic form, since the copper sulfide probably decomposes Pb O or the copper oxide probably Pb S with metal precipitation, but not lead silicate. On the other hand, only a relatively small amount of copper can slag, because no free silica is present during melting and the easily flowing lead-silicate slag separates quickly from the copper bath, and also because a considerable part of the copper is already introduced into the melting process in the metallic state. In this way, through a single melting in the furnace, an almost lead-free black copper and a slag containing all lead is obtained from the copper stone prepared by sintering blowing in the presence of silica. Other impurities in the copperstone, such as arsenic and antimony, will be overridden the fading work partly evaporated, partly they remain in the oxidized state sintered mass and then go into the slag in the flame furnace melting while the copper remains almost free of it. Another embodiment of the present method consists in the following: In the for A certain mass is melted down in the furnace, a larger amount of copper oxide is added, than to that of Flammoferi melting. going reaction between the Copper sulfide and the copper oxide is required. This is done either by one burns a correspondingly larger amount of sulfur during the blowing work, or else that before or after blowing, additions rich in copper oxide are added to the mass Form adds. As a result of this measure, the copper bath formed in the flame furnace contains a certain excess of copper oxide, and this excess copper oxide causes another purification of the black copper bath by removing what is left in the bath metallic lead as well as impurities such as arsenic and antimony are oxidized and incorporated into the Slag drifts. . In the lead shaft furnace there is sometimes a slight. Amount of an alloy of lead, copper and arsenic, which is found in a thin layer between the lead and the food Shift. The processing of this alloy is extremely difficult and expensive. The present invention enables the copper and the Lead at a low cost and easy to obtain. To this end, will the alloy grained and together with a copper stone, which is also smaller or may contain larger amounts of lead, or with a sulphidic ore of equivalent Subjecting the composition to the present process; d. H. in the presence of silica first roasted and sintered by blowing and then melted down in a furnace. During the blowing process, most of the arsenic content of the alloy is volatilized and the other part is converted into arsenic acid Lead transformed, the lead is transformed into lead silicate. During the subsequent flame furnace melting then passes the lead and the rest of the arsenic in the manner described above into the slag, and the result is a black copper that is low in lead and arsenic. Godfather ν τ-Α ν Proverbs: i. Process for separating lead and other contaminants such as arsenic and antimony, from copper stones and copper ores with the extraction of copper as metal, characterized in that the stones or ores are blown in a solid state in the presence of Silicic acid is converted into a sintered mass, which is all lead as silicate and also contains the other impurities in slagged form, while the copper in it is partly in the form of copper oxide or metallic copper, partly as copper sulphide, whereupon this sintered mass in the flame furnace to achieve an almost pure copper and a the slag containing lead and other impurities is melted down. 2. embodiment of the method according to claim i, characterized in that the copper oxide content of the goods going into the smelting work by corresponding Regulation of the amount of sulfur burned during the preparatory blowing or by adding ores and products containing copper oxide higher than is necessary to keep everything in the Mass of copper sulphide with the deposition of metallic copper in To set reaction, for the purpose of the copper bath obtained on melting to exert a further cleaning effect through the excess copper oxide. 3. The application of the processing procedure described under 1. and 2. the lead-copper-arsenic alloy falling in the lead shaft furnace in such a way that this alloy can be combined with copper stone (unleaded or lead-containing) or sulphidic copper ores under 1. and 2. subject to the claimed process.