Scrap recovery

The metal dissolves readily in concentrated HCl, H PO, HI, or HCIO. Nitric acid (qv) forms a protective oxide skin on the metal and can be removed by ca 0.05 Af HF. Dissolution of Pu metal in HNO —HF mixtures is common practice in scrap-recovery plants. The metal does not dissolve readily in H2SO4 because passivation of the metal surface occurs. The reaction of water and Pu metal is slow compared to that in HCl, HI, or HCIO. ... 

Figure 2. Flow of Material in Scrap Recovery at Los Alamos...

The advantage of hydride recovery is its ability to recover a large fraction of the scrap in metallic form. This method therefore has a major economic advantage over chemical recycle and subsequent reduction to metal. It is just beginning to be used as a production aid for metallic scrap recovery. 

Major supplies of copper are converted into alloys such as bronze and brass. The production of copper pipes and tubes, arsenical copper rods, and so on, was started only during World War II and, at the same time, metal recovery from commercial scrap was initiated. It was only in the third 5-yr plan that plans for adequate production of copper were formulated. The demand in 1971 was 85,000 metric tons, and the estimated demand in 1979 is 116,000 metric tons. Estimated production and scrap recovery are 45,000 and 16,000 metric tons. This leaves 57,000 metric tons for import. 

Actinide Recovery Area. Both WTFs require an Actinide Recovery Area where actinides are recovered from the liquors being produced in the above-mentioned treatment areas. The WTF supporting the fuel reprocessing plant (see Figure 3) requires both a TBP and CMP extraction cycle, but the WTF supporting the fuel refabrication plant can be operated with a CMP extraction cycle alone and by utilizing the existing, on-site TBP scrap recovery system. 

The most rigorous recovery technique is burning of plutonium-impregnated material in a plutonium scrap-recovery incinerator followed by grinding and leaching the ash with a mixture of hot nitric and hydrofluoric acids. Undissolved plutonium in the ashes may be recovered by fusion with a suitable salt, such as a 10 1 K4(S04)j-NaF melt, to get a product soluble in nitric acid. Nonbumable solids can be leached directly with a HNO3-HF mixture. 

Smelting and refining operations, scrap recovery, automobile radiator repair, construction and demolition processes, and firing range operations may result in significant exposure of workers to lead (Skerfving... 

Rework/Scrap Costs. Scrap and rework can consume significant amounts of labor in trying to recover the material. Scrap recovery savings are always less than the cost of the original material. This is a good candidate for continuous improvement, and I have seen a lot of low-hanging fruit to be picked in the area of scrap reduction. 

Electrical Vdlues Scrap Recovery Granulators Deflashsrs... 

Decisions made in each of the previous areas influence the layout and sizing of the resin distribution system. It must accommodate all of the requirements of the storage, blending, drying, and scrap recovery operations while taking into account resin characteristics and plant layouts. It is typically one of the final items designed aft er many other system decisions have been made. 

L. E. BRUNS, "Geometrically Favorable Plutonium Scrap Recovery Plant, Ckem. Eng. Progr. Symp. Ser., Preparation ofEuclear Fuels, 63, 80, 156 (1967).,... 

BorosUicate-i ass Raschig rings purchased to ANSI N16.4 1971 standard are used as neutron absorbers in a hostile, corrosive chemical atmosphere in the NNFD uranium scrap recovery process. In the processing of highly enriched uranium, fixed neutron absorbers are required in all vessels greater than five-inch diameter to prevent the occurrence of possible critical reactions. 

The anode material for silver clectrorelining is mainly derived from anode slimes from copper. Lead, nickel and zinc electrorefining processes together with diverse contributions from the secondary recovery and scrap-recovery processes. 

Figure 6 shows a sketch of the dashboard designed for recycling and obtained with a process based on the previously described assembhng technique. The system has three basic components, that, in the past were made of different materials in a new design this system has been molded from TPO based polymers to provide rigidity, comfort, safety, and aesthetics. Some prototypes have been recycled following the traditional procedures for the scrap recovery of thermoplastic materials. The mechanical characteristics of the obtained materials are reported in Table 9. 

The BIR was established in 1948 as a world federation of traders and producers involved in the international scrap recovery and recycling industry, and acts to promote their interests. It publishes an annual report and regular statistics on the scrap industry. 

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