Abstract: The present invention involves a method for separating a first copper-containing mineral from a second copper-containing mineral using froth flotation where one of the minerals has a more readily oxidizable surface than the other. Prior to flotation, a slurry containing the copper-containing minerals is oxidized and conditioned to achieve an effective pH. Thereafter, the slurry is subjected to a froth flotation process by which a first copper-containing mineral, such as chalcocite, and a second copper-containing mineral, such as enargite, are recovered.

Abstract: A process for recycling hydrogen cyanide from a cyanide-containing slurry is provided. The process includes the steps of adjusting the pH of a cyanide-containing slurry, volatilizing HCN contained in the pH adjusted slurry and contacting the volatilized HCN with a precious metals-containing slurry to recover precious metals therefrom. Alternatively, the HCN can be contacted with reclaim, or decant, water to recover cyanide, thereby conserving resources.

Abstract: A process for enhancing fluidization in a fluidized bed reactor chamber. In a preferred embodiment, molybdenum oxide is reduced to molybdenum metal in the fluidized bed. An oxidant is introduced into the fluidized bed during the reducing process in order to substantially prevent or reverse the agglomeration of the particles.

Abstract: The present invention involves a method for separating copper sulfide from rimmed iron sulfide by flotation. Prior to flotation, a slurry containing the sulfides is oxidized and conditioned to achieve a pH greater than pH 9. Thereafter, the slurry is subjected to a froth floatation process by which a copper sulfide, such as chalcopyrite, concentrate is recovered.

Abstract: A process for removing and recovering cyanide from a cyanide-containing mixture. The process includes the steps of adjusting the pH of the cyanide-containing mixture to between about 6 to about 9.5, volatilizing the HCN contained in the pH adjusted mixture and contacting the volatilized HCN with basic material. Preferably, the cyanide recovery process is performed on tailings slurries resulting from metal recovery processes.

Abstract: A process for removing and recovering cyanide from a cyanide-containing solution. The process includes the steps of adjusting the pH of the cyanide-containing solution to between about pH 6 and about pH 9.5, volatilizing the HCN contained in the pH adjusted solution and contacting the volatilized HCN with basic material. Preferably, the cyanide recovery process is performed on tailings slurries resulting from metal recovery processes.

Abstract: Means are disclosed for rendering talcs such as Montana talc or like talcs hitherto considered incompatible or unsuitable as fillers for thermoplastic resinous compositions, and particularly polypropylene molding resins, suitable for this use. Such talcs, which in their unbeneficiated state strongly discolor the resinous matrix and affect its long-term heat stability, are beneficiated in accordance with this invention, generally at low cost, while improving or at least not unacceptably diminishing other significant physical properties, particularly yellowness index, flexural modulus and impact strength, of the resulting molded article. This is accomplished by admixing Montana talc or the like with an effective amount of a combination of:(A) one or a mixture of certain octyl- or nonylphenol/poly(ethylene oxide) condensates, and(B) one or a mixture of certain poly(ethylene glycols) or alkoxypoly(ethylene glycols).

Abstract: Means are disclosed for rendering talcs such as Chinese talcs, Australian talcs, Italian talcs or like talcs which, when ground to an approximately 2.5-5.0 .mu.m median particle size, exhibit a wet powder brightness of at least about 30% and which have hitherto been considered acceptable as fillers for thermoplastic resinous compositions, and particularly polypropylene molding resins, even suitable for this use. Such talcs are beneficiated in accordance with this invention, generally at low cost, to further enhance brightness, heat stability or both these properties in thermoplastic molded articles filled with these beneficiated acceptable talcs, while also improving or at least not unacceptably diminishing other significant physical properties, particularly tensile properties, of the resulting molded article.