Brass World: A Monthly Publication Relating to the Arts of Refining, Alloying, Casting, Rolling, Plating, Polishing and Finishing of the Non-Ferrous Metals and Their Alloys (December, 1929)
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290 tery plates is by blast furnace. These furnaces can be had in several sizes, and we suggest you get in touch with manufacturers of blast furnaces for further informa- tion. With proper equipment, the cost of recovery should not exceed $5.00 per ton. the proper fluxing to run the furnace successfully. In a general way, the proper flux is iron scale and galena ore, lime, fluorspar, coal dust and silica. We suggest that if you go into this business you secure a man familiar with this class of work to start your furnace. We believe you will save considerable by procuring the proper man to install your furnace. There are other methods of reclaiming battery lead. The blast furnace method, however, is the cheapest and best. —W. J. REARDON. Refining Solder Dross Q.—Will you kindly advise if you have any informa- tion on how to run a solder dross containing approxi- mately 60 to 65 per cent metallics that analyzes 4 per cent copper, 35 per cent tin, % to 1 per cent antimony, balance lead? When running this metal into our regular dross fur- nace starting with a 4 per cent copper, we have, when finished, a 6 per cent copper mixture, and when refining this in a pot it naturally gives us excessive dross, which it is necessary to refine again. We wonder whether there is a possibility of reducing this copper during the first melting and creating a matte from the start? What fluxes are used? A.—We suggest you try a flux composed of: Galena ore (a sulphur ore)...... 100 Ibs UT WN ey iw Sao sO 100 lbs | ME OA Rosai oa. arta 15 lbs ale AMRIM Lc as 3.6 sc en eae es 75 \bs. ee MINES oi ree fos OS bee 200 Ibs WN. 955 o5 bax oy Coven Ra RD 50 lbs Use from 10 per cent to 20 per cent of this mixture in your first melting. This flux should form a matte and take out the copper and throw the tin and lead to the bottom. It may be necessary, if you find the copper is still in the tin and lead, to add more galena ore to the mixture of flux. Such a mixture gives good results in removing the copper. The copper goes after the sulphur and is run off in the slag, and the iron throws the tin and lead to the bottom. : | —W. J. REARDON. Alloying Copper and Aluminum ©Q.—Can you give us information in regard to melt- ing copper and aluminum so that it will not make a slag but-a clean melt? Would also like to get information in regard to draw- ing pure nickel. This seems to drag on the draw tools and cling to them. Is there anything you know of which would overcome this? A.—By “melting copper and aluminum” you mean making an alloy of copper and aluminum. The method we would suggest is to use electro-copper and virgin aluminum. Melt the copper first. Just as the copper melts, add the aluminum, stirring well, add a handful of salt, ‘and bring the metal to pouring tempera- ture. There are a number of fluxes used for this alloy that give good results. If you desire, the names of them will be sent you. However, you will find very little BRASS WORLD It is necessary to understand we assume = ~~ slag if you use the method above, and this should be what you desire. In reference to drawing pure nickel, we suggest you try lard oil. | “a3 —W. J. REARDON. Furnaces for Zinc Metallics ©.—We manufacture melting equipment and have a client who now is using iron pots in running down im- pure zinc metallics, and who wishes to know which of our furnaces to use. They mentioned a reverberatory but we suggested a tilting crucrble furnace with cover over crucible as well as over the furnace, or an iron pot tilting furnace. They say that their loss in oxide is about % at present. Their metallics are impure, that they oftentimes re- move skimmings, which is oxide, equal to tonnage of pig metal produced ; and their best results are obtained in bath of metal and working the new charge into it. The customer advises that the metallics that they charge into a furnace is a product which has adhering to it metallic particles, some oxide, and other impurities such as chlorine, silica and some tramp metals. They December, 1929 would not wish to convey that the skimmings or loss — of metal in the melting was formed during the melting, although some zinc is converted to oxide in their present practice. They would be interested in data in regard to use of a reverberatory furnace. They refer to a reverberatory where tonnage of 10 to 25 tons of slabs is desired. What is your recommendation ? A.—There is no better method of running down zinc. scrap than the iron pot. tilting type. However, this method will not reduce oxide of zinc. Only free zine will be recovered by the iron pot method. This can be the stationary or For zinc ashes and skimmings containing considerable > amounts of oxide and zinc dust, the retort furnace is the furnace to reduce such metal. For sal ammoniac skimmings, zinc ash and zinc dross we would not recom- mend a reverberatory furnace. However, there was a furnace that looked good to me for this work published in Brass Wortp for December, 1907, by Edgar F. Blessing. Look this up. It may interest you. Also, a .furnace, Patent No. 932279, described in THe MertTar Inpustry of October, 1909. Also, a patent furnace, Patent No. 910982, described in Brass Wortp of Febru- ary, 1909. The zinc retort you can see in any zinc _ works, or you will find a description at the library. —W. J. REARDON. Sweating in Bronze Castings O.—We are experiencing considerable difficulty of late in the final finish of our ornamental castings, whether in brass, bronze or extruded metal mixtures. The patterns are all molded in French sand from com- bined wood and wax and plaster patterns and occa- sionally hard black wax patterns. The work is mainly faced and double faced work, skin dried and oven dried; and the metal used is a standard ornamental bronze mix- ture of 86 copper, 3 tin, 2 lead and 9 zinc. Our trouble consists of small “pimples” face of the casting which show only when the work is either highly polished or finally colored in statuary 2 bronze. We have changed our methods in an effort to eliminate these but do not seem to be successful. We should be glad to have you advise us as to the causes of this condition. A.—We are of the opinion that your trouble ‘is in : on the sur- — i ee Pee f a4 o> dak oes aT h, aks NR Aa i re) Boil lag uN L. “ee i y an own Pay a a =
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