Abstract: An industrial waste stream recycling method for recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams containing zinc compounds by leaching the waste stream with a solution of 30% or greater by weight ammonium chloride, resulting in a first product solution and undissolved materials; adding zinc metal to the first product solution, whereby zinc-displaceable metal ions contained in the first product solution are displaced by the zinc metal and precipitate out of the first product solution as metals, leaving a second product solution; and diluting the second product solution with water, resulting in the precipitation of zinc oxide.

Abstract: A method for reducing the formation of Zn(NH4)4Cl2 from ZnO/NH4Cl solutions formed during an industrial waste stream recycling method useful for the recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams.

Abstract: An industrial waste stream recycling method for recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams containing zinc compounds by leaching the waste stream with a solution of 30% or greater by weight ammonium chloride, resulting in a first product solution and undissolved materials; adding zinc metal to the first product solution, whereby zinc-displaceable metal ions contained in the first product solution are displaced by the zinc metal and precipitate out of the first product solution as metals, leaving a second product solution; and diluting the second product solution with water, resulting in the precipitation of zinc oxide.

Abstract: A method for reducing the formation of Zn(NH4)4Cl2 from ZnO/NH4Cl solutions formed during an industrial waste stream recycling method useful for the recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams.

Abstract: The beneficiation of an electric arc furnace (EAF) dust waste stream comprising zinc compounds by collecting and combining dust from two or more EAF batches with coal fines to form briquettes, adding the briquettes to a final EAF batch with the charge, and collecting the dust from the final EAF batch, so that the zinc in the beneficiated dust is of a greater proportion than in a typical batch of EAF dust. Alternatively, the EAF dust can be split into two dust streams, one of which is returned to the EAF, while the other is treated in a hydrometallurgical process. Either waste stream preliminary can be treated by adding carbon and an ammonium chloride solution, separating any undissolved components from the solution, displacing undesired metal ions from the solution using zinc metal, treating the solution to remove therefrom zinc compounds, and further treating the zinc compounds and the undissolved components resulting in zinc products and an optional iron-carbon feedback.

Abstract: A method for producing a more concentrated iron product from an industrial waste materials stream comprising iron and non-iron constituents such as EAF and basic oxygen furnace dust generally comprising the steps of compacting or briquetting the waste materials stream, roasting the waste materials stream at temperatures above about 980.degree. C. to convert the iron compounds to direct reduced iron, crushing the roasted waste materials stream, separating the iron compounds contained in the waste materials stream by magnetic separation or flotation, and providing the iron compounds back to the EAF or basic oxygen furnace.

Abstract: A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminarily can be treated by adding carbon and an ammonium chloride solution, separating any undissolved components from the solution, displacing undesired metal ions from the solution using zinc metal, treating the solution to remove therefrom zinc compounds, and further treating the zinc compounds and the undissolved components, as necessary, resulting in the zinc products and the optional iron-carbon feedbacks. Once the zinc oxide has been recovered, the purification process is used to further purify the zinc oxide to obtain zinc oxide which is at least 99.8% pure and which hsa predeterminable purity and particle characteristics.

Abstract: The invention provides novel compounds of formula (I) having nematicidal, insecticidal, acaricidal and fungicidal properties, compositions comprising them and processes and intermediates for their preparation: ##STR1## wherein R.sup.1 is --S(O).sub.n CH.sub.2 CH.sub.2 CH.dbd.CF.sub.2 ;n is selected from 0, 1 and 2;R.sup.2, R.sup.3, and R.sup.4 are independently selected from hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, alkylcycloalkyl, optionally substituted aryl, optionally substituted arylalkyl, optionally substituted aryloxy, optionally substituted arylalkoxy, alkoxy, alkenyloxy, alkynyloxy, hydroxyalkyl, alkoxyalkyl, alkylthio, alkenylthio, alkynylthio, haloalkyl, haloalkenyl, haloalkynyl, haloalkoxy, haloalkenyloxy, haloalkynyloxy, haloalkylthio, haloalkenylthio, haloalkynylthio, halogen, hydroxy, cyano, nitro, --NR.sup.5 R.sup.6, --NR.sup.7 COR.sup.8, --NR.sup.9 SO.sub.2 R.sup.10, --N(SO.sub.2 --R.sup.11)(SO.sub.2 --R.sup.12), --COR.sup.13, --CONR.sup.14 R.sup.15, --COOR.sup.16, --OCOR.sup.17, --OSO.

Abstract: A photopolymerizable composition which comprises at least one ethylenically unsaturated polymerizable monomer, at least one selected ketone and at least one organic peroxide. The compositions are useful in the preparation of adhesives, paints and varnishes particularly in dental applications and exhibit reduced air inhibition on being cured by visible radiation in the range 400 m.mu. to 500 m.mu..