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By Michael L. Jaeck (Eds.)

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Additional resources for Primary and Secondary Lead Processing. Proceedings of the International Symposium on Primary and Secondary Lead Processing, Halifax, Nova Scotia, August 20–24, 1989

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Typically, these slags have been cast or granulated and then stockpiled in a field adjacent to the lead smelter. , some four to five million tons of slag containing up to 600,000 short tons of zinc have been stored; another 150,000 short tons of slag containing 15,000 to 20,000 short tons of zinc are added to the stockpile annually. , lead blast furnace slag would be designated a characteristic hazardous waste, D008 and D006 for leachable lead and cadmium, respectively. The production and stockpiling of slag has continued since the passage of the Resource Conservation and Recovery Act only because the slag is specifically excluded from the law by the 1980 Bevill Amendment.

The composition and size ranges are given in Table 1. TABLE 1. 1 ~| Results Streak photographs were taken over a series of temperatures for each material. In general, below the ignition point the photograph would show no reaction. As the Furnace temperature was increased, ignition of the concentrate could be detected in the lower part of the tube. With further increases the ignition point was seen higher and higher up the tube until only a bright glow was observed from top to bottom. The temperature range for this transition was normally only 20-30 °C.

It is also assumed that trie amount of oxygen reaching the interface is exactly sufficient to react with all of the PbS and S2 which are arriving. The reaction products at the interface will depend on the temperature. At lower temperatures PbS0 4 will be formed, with PbO assumed to be the stable phase at higher temperatures. The formation of basic sulphates is ignored for simplicity. The phase formed at the interface will affect the mass transfer rates due to the different stoichiometry involved.

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