Abstract: Disclosed is a method for producing a high-purity nanometer zinc oxide from steel plant smoke and dust by ammonia decarburization. The method comprises: leaching with an ammonia water-ammonium carbonate solution as a leaching agent, adding 0.3-0.5 kg of sodium fluorosilicate to per cubic meter of the leaching agent to obtain a leaching solution, then adding 50-60 kg slaked lime to per cubic meter of the leached solution to carry out decarburization with heating, and carrying out purification and impurity removal and then refining treatment. According to the method, the ammonia process is used for treating smoke and dust, and the existing ammonia process is adaptively improved, the leaching speed and the leaching rate of zinc in the smoke and dust are improved, and the zinc oxide with the purity of more than 99.

Abstract: Disclosed is a method for producing a nanometer zinc oxide from low-grade zinc oxide ore by ammonia decarburization. The method comprises: taking ammonia water-ammonium bicarbonate solution as a leaching agent; adding 0.3-0.5 kg sodium fluorosilicate to per cubic meter of the leaching agent; leaching low-grade zinc oxide ore with the leaching agent; and adding 50-60 kg slaked lime to per cubic meter of leached solution to carry out decarburization treatment. The obtained nanometer zinc oxide powder has purity of 99.7% or up, uniform particle size distribution (average particle size of 10-28 nm), specific surface area of 107 m2/g or up, good fluidity and good dispersity. The treatment method of the present invention is low in energy consumption and high in efficiency, and the leaching agent can be recycled.

Abstract: Disclosed is a method for producing a high-purity nanometer zinc oxide from electrolytic zinc acid leaching residues by ammonia decarburization. The method comprises: adding 0.3-0.5 kg of sodium fluorosilicate to per cubic meter of ammonia water-ammonium bicarbonate solution when leaching, and then adding 30-60 kg of slaked lime to per cubic meter of a leached solution for carrying out decarburization and refining treatment. The present invention obtained nanometer zinc oxide powder has purity of 99.7% or up, uniform particle size distribution (average particle size of 10-30 nm), specific surface area of 105 m2/g or up, good fluidity and good dispersity.

Abstract: Disclosed is a method for producing nanometer lithopone from electrolytic zinc acid leaching residue. The method comprises specific steps of: leaching, purifying, carrying out a metathetical reaction, washing, smashing and the like. Through these steps, zinc is selectively leached out by an ammonia-ammonium sulfate process; and iron and arsenic are removed by ammonium persulfate, heavy metal elements such as nickel, copper, lead, cadmium and the like are removed by sulfurization method and zinc powder replacement method; and a metathetical reaction is carried out to obtain an nZnS—BaSO4 crystalline filter cake, the crystalline filter cake is dried and smashed to obtain a nanometer lithopone product. The zinc in the acid leaching residue can be recycled effectively by this method.

Abstract: Disclosed is a method for producing a high-purity nanometer zinc oxide from steel plant smoke and dust by ammonia decarburization. The method comprises: leaching with an ammonia water-ammonium carbonate solution as a leaching agent, adding 0.3-0.5 kg of sodium fluorosilicate to per cubic meter of the leaching agent to obtain a leaching solution, then adding 50-60 kg slaked lime to per cubic meter of the leached solution to carry out decarburization with heating, and carrying out purification and impurity removal and then refining treatment. According to the method, the ammonia process is used for treating smoke and dust, and the existing ammonia process is adaptively improved, the leaching speed and the leaching rate of zinc in the smoke and dust are improved, and the zinc oxide with the purity of more than 99.

Abstract: Disclosed is a method for producing a high-purity nanometer zinc oxide from electrolytic zinc acid leaching residues by ammonia decarburization. The method comprises: adding 0.3-0.5 kg of sodium fluorosilicate to per cubic meter of ammonia water-ammonium bicarbonate solution when leaching, and then adding 30-60 kg of slaked lime to per cubic meter of a leached solution for carrying out decarburization and refining treatment. The present invention obtained nanometer zinc oxide powder has purity of 99.7% or up, uniform particle size distribution (average particle size of 10-30 nm), specific surface area of 105 m2/g or up, good fluidity and good dispersity.

Abstract: Disclosed is a method for producing a nanometer zinc oxide from low-grade zinc oxide ore by ammonia decarburization. The method comprises: taking ammonia water-ammonium bicarbonate solution as a leaching agent; adding 0.3-0.5 kg sodium fluorosilicate to per cubic meter of the leaching agent; leaching low-grade zinc oxide ore with the leaching agent; and adding 50-60 kg slaked lime to per cubic meter of leached solution to carry out decarburization treatment. The obtained nanometer zinc oxide powder has purity of 99.7% or up, uniform particle size distribution (average particle size of 10-28 nm), specific surface area of 107 m2/g or up, good fluidity and good dispersity. The treatment method of the present invention is low in energy consumption and high in efficiency, and the leaching agent can be recycled.

Abstract: Disclosed is a method for producing nanometer lithopone from electrolytic zinc acid leaching residue. The method comprises specific steps of: leaching, purifying, carrying out a metathetical reaction, washing, smashing and the like. Through these steps, zinc is selectively leached out by an ammonia-ammonium sulfate process; and iron and arsenic are removed by ammonium persulfate, heavy metal elements such as nickel, copper, lead, cadmium and the like are removed by sulfurization method and zinc powder replacement method; and a metathetical reaction is carried out to obtain an nZnS—BaSO4 crystalline filter cake, the crystalline filter cake is dried and smashed to obtain a nanometer lithopone product. The zinc in the acid leaching residue can be recycled effectively by this method.

Abstract: A hybrid flexible pipe and method of manufacture having one or more web layers over a tubular core and a polymer layer over the web layers and tubular core. A flexible helical reinforcement layer having gaps between strips is wrapped on top of the polymer layer. A second flexible helical reinforcement layer having gaps between strips is helically wrapped around the first helical reinforcement layer in the opposite direction. A sheath layer is positioned as the outermost layer. A first flexible helical anti-extrusion layer having a first anti-extrusion strip can be helically wrapped around the first flexible helical reinforcement layer in substantially the same direction as the first flexible reinforcement layer and a second flexible helical anti-extrusion layer having a second anti-extrusion strip can be helically wrapped around the at least one second flexible helical reinforcement layer in substantially the same direction as the second flexible helical reinforcement layer.

Abstract: A hybrid flexible pipe and method of manufacture having one or more web layers over a tubular core and a polymer layer over the web layers and tubular core. A flexible helical reinforcement layer having gaps between strips is wrapped on top of the polymer layer. A second flexible helical reinforcement layer having gaps between strips is helically wrapped around the first helical reinforcement layer in the opposite direction. A sheath layer is positioned as the outermost layer. A first flexible helical anti-extrusion layer having a first anti-extrusion strip can be helically wrapped around the first flexible helical reinforcement layer in substantially the same direction as the first flexible reinforcement layer and a second flexible helical anti-extrusion layer having a second anti-extrusion strip can be helically wrapped around the at least one second flexible helical reinforcement layer in substantially the same direction as the second flexible helical reinforcement layer.