Abrégé

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 0.3-0.5kg of sodium fluorosilicate to per cubic meter of ammonia water-ammonium bicarbonate solution when leaching, and then adding 30-60kg of slaked lime to per cubic meter of a leaching agent for performing decarburization and refining treatment. The obtained nanometer zinc oxide powder has purity of 99.7% or more, uniform particle size distribution (average particle size of 10-30nm), specific surface area of 105 m2/g or more, good fluidity and good dispersity. The treatment method is characterized by low energy consumption and high efficiency; all valuable and harmful heavy metals in the electrolytic zinc acid-leaching residues are leached out to be reasonably utilized and cleaned with water, so that the obtained final leaching residues are converted from electrolytic zinc acid-leaching residues as high hazard wastes into ordinary solid wastes.

Classes IPC  ?

• C01G 9/02 - OxydesHydroxydes
• B82Y 30/00 - Nanotechnologie pour matériaux ou science des surfaces, p. ex. nanocomposites

Abrégé

Disclosed is a method for producing nanometer lithopone from low-grade zinc oxide ore compound waste gypsum. The method comprises specific steps of: leaching, purifying, carrying out a metathetical reaction, washing, smashing and the like. According to the method, zinc is leached out selectively by an ammonia-ammonium sulfate process; heavy metal elements such as nickel, copper, lead, cadmium and the like are removed by combining an iron and arsenic removal method using ammonium persulphate, a sulfurization method and a zinc powder replacement method; and a metathetical reaction carried out to obtain an nZnS-BaSO4 superfine crystalline filter cake, and the crystalline filter cake is dried and smashed to obtain a nanometer lithopone product. According to the method, the quality of the obtained lithopone product is good, a zinc raw material used for production is provided by a low-grade zinc oxide ore, and sulfate radical is provided by waste gypsum; and zinc in the low-grade zinc oxide can be recycled, resource utilization of the waste gypsum is implemented, the production cost is low, and the operation is simple.

Classes IPC  ?

• C09C 1/06 - Lithopone
• C01G 9/08 - Sulfures
• C01F 11/46 - Sulfates
• B82Y 40/00 - Fabrication ou traitement des nanostructures

Abrégé

Disclosed is a method for producing a high-purity nanometer zinc oxide from electrolytic zinc acid-leaching residues by an ammonia process. The method comprises: adding slaked lime being 1-5% of the mass of electrolytic zinc acid-leaching residues to perform activation before a leaching step, then leaching with ammonia water-ammonium bicarbonate solution, adding 0.3-0.5kg of sodium fluorosilicate to per cubic meter of the ammonia water-ammonium bicarbonate solution, and refining after performing purification and impurity removal. According to the method, the electrolytic zinc acid-leaching residues can be leached efficiently, and the high-purity nanometer zinc oxide with the purity more than 99.7% can be obtained. Valuable and harmful heavy metals in the electrolytic zinc acid-leaching residues are leached out for use, so that the obtained final leaching residues are converted from electrolytic zinc acid-leaching residues as high hazard wastes into ordinary solid wastes, and accordingly environment friendliness and reasonable utilization of resources are realized.

Classes IPC  ?

• C01G 9/02 - OxydesHydroxydes
• B82Y 40/00 - Fabrication ou traitement des nanostructures
• C22B 3/14 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques alcalines contenant de l'ammoniaque ou des sels d'ammonium
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p. ex. des rognures, pour produire des métaux non ferreux ou leurs composés
• C22B 19/30 - Obtention du zinc ou de l'oxyde de zinc à partir de résidus métalliques ou rognures

Abrégé

Disclosed is a method for producing a high-purity nanometer zinc oxide from low-grade zinc oxide ore by an ammonia process. The method comprises: taking slaked lime of 3-5% mass of the low-grade zinc oxide ore for activation before leaching, then taking ammonia water-ammonium bicarbonate solution as a leaching agent, adding 0.3-0.5kg of sodium fluorosilicate to per cubic meter of the leaching agent for leaching, purifying for impurity removal, and refining. On one hand, efficient leaching of the low-grade zinc oxide ore is achieved, and the high-purity nanometer zinc oxide with a large specific surface area can be obtained at a low calcination temperature; and on the other hand, the treatment method is low in energy consumption, valuable and harmful heavy metals in the low-grade zinc oxide ore can be all leached out for use and cleaned with water, and accordingly economy, environment friendliness and reasonable utilization of renewable resources are achieved.

Classes IPC  ?

• C01G 9/02 - OxydesHydroxydes
• B82Y 40/00 - Fabrication ou traitement des nanostructures
• C22B 3/14 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques alcalines contenant de l'ammoniaque ou des sels d'ammonium
• C22B 19/34 - Production de l'oxyde de zinc

Abrégé

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 leachate to perform decarburization treatment. The obtained nanometer zinc oxide powder has purity of 99.7% or more, uniform particle size distribution (average particle size of 10-28nm), specific surface area of 107 m2/g or more, good fluidity and good dispersity. The treatment method is low in energy consumption, and the leaching agent can be recycled. The final leaching residue subject to the leaching treatment, without destruction of original mineral component phase composition, can still be used for brick making, so as to achieve dual purposes of economy and environment protection.

Classes IPC  ?

• C01G 9/02 - OxydesHydroxydes
• B82Y 40/00 - Fabrication ou traitement des nanostructures
• C22B 3/14 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques alcalines contenant de l'ammoniaque ou des sels d'ammonium
• C22B 19/34 - Production de l'oxyde de zinc

Abrégé

Provided is a method for producing a high-purity nanometer zinc oxide from steel plant smoke and dust by an ammonia process. The method comprises the following steps of: leaching the steel plant smoke and dust, carrying out purification and impurity removal, crystallizing by ammonia evaporation and calcining to dry. Before the step of leaching the steel plant smoke and dust, the steel plant smoke and dust are added with slaked lime and water to keep the water content of the mixture to be 8-10% and activated under mixing, wherein the amount of the slaked lime added is 3-5% by weight of the steel plant smoke and dust; the activated steel plant smoke and dust are leached with an ammonia water-ammonium bicarbonate solution as a leaching agent, 0.3-0.5kg of sodium fluorosilicate is added to per cubic meter of the leaching agent, and purification and impurity removal are carried out. Into the liquid treated with purification and impurity removal, ammonium phosphate and a surfactant are added, and the added amounts per cubic meter of the liquid treated with purification and impurity removal are 1-3 kg of ammonium phosphate, 10-50 g of the surfactant. According to the method, the high-purity nanometer zinc oxide with a larger specific surface area can be obtained; and the method is characterized by low energy consumption and high efficiency, and thoroughly solves the problem of zinc load of steel plant furnace smoke and dust as the leaching agent can be recycled, thereby meeting the requirement of the steel plant on purification of the harmful components comprising zinc and alkali metals and achieving good production circulation.

Classes IPC  ?

• C01G 9/02 - OxydesHydroxydes
• B82Y 40/00 - Fabrication ou traitement des nanostructures
• C22B 3/14 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques alcalines contenant de l'ammoniaque ou des sels d'ammonium
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p. ex. des rognures, pour produire des métaux non ferreux ou leurs composés
• C22B 19/34 - Production de l'oxyde de zinc

Abrégé

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 0.3-0.5kg of sodium fluorosilicate to per cubic meter of the leaching agent to obtain a leaching solution, then adding 50-60kg slaked lime to per cubic meter of the leaching 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 99.7% can be obtained; the inventive treatment method is characterized by low energy consumption and high efficiency, and thoroughly solves the problem of zinc load of steel plant furnace smoke and dust as the leaching agent can be recycled, thereby meeting the requirement of the steel plant on purification of the harmful components comprising zinc and alkali metals and achieving good production circulation.

Classes IPC  ?

• C01G 9/02 - OxydesHydroxydes
• B82Y 40/00 - Fabrication ou traitement des nanostructures
• C22B 3/14 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques alcalines contenant de l'ammoniaque ou des sels d'ammonium
• C22B 7/02 - Mise en œuvre des cendres folles
• C22B 19/34 - Production de l'oxyde de zinc

Abrégé

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; heavy metal elements such as nickel, copper, lead, cadmium and the like are removed by combining an iron and arsenic removal method using ammonium persulphate, a sulfurization method and a 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, and the zinc in the acid leaching residue can be recycled effectively. The ammonia leaching method is used as the technical means of effectively treating the acid leaching residue, the obtained lithopone product is good in quality, and sulfate radicals needed in the production are provided by the acid leaching residue itself, so that the resource utilization of the acid leaching residue is implemented; and in addition, the production cost is low, and the operation is simple.

Classes IPC  ?

• C09C 1/06 - Lithopone
• C01G 9/08 - Sulfures
• C01F 11/46 - Sulfates
• B82Y 40/00 - Fabrication ou traitement des nanostructures