70results about "Zirconium sulfates" patented technology

There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with HCl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. Several other metals can be extracted from the leachate (Fe, Ni, Co, Mg, rare earth elements, rare metals, etc.). Various other components can be extracted from solid such as TiO₂, SiO₂ etc.

The invention discloses a method for preparing a cerium oxide-zirconium oxide based composite rare-earth oxide. The method comprises the following steps of: (1) heating a zirconium salt solution at room temperature, slowly adding sulfate ions, controlling the temperature rise rate so that the temperature is increased in the range of 90-95 DEG C when the sulfate ions are added completely, and then preserving heat for 20-100 minutes, thereby forming a zirconium basic sulfate composite salt precursor; (2) adding a cerium salt and a rare-earth metal salt to the precursor solution and stirring evenly, thereby obtaining a slurry; (3) settling the slurry by using basic carbonate and/or a basic oxalate solution, thereby obtaining a precipitate; and (4) filtering and washing the precipitate obtained in the step (3), removing purities, and calcining the washed precipitate. The cerium oxide-zirconium oxide based composite rare-earth oxide prepared by the method by controlling raw materials and process conditions has the characteristics of being high in total fine pore volume, high in fresh specific surface area, high in oxygen storage capacity and the like.

Provided is a process for isolating zirconium peroxosulfate and its use, either as is or to prepare high purity zirconium compounds including powders of zirconium dioxide and stabilized zirconia. The process is based on precipitating a peroxide compound from an acidic peroxide solution of zirconium and provides a simple, economical method for producing the zirconium peroxosulfate powder and its derivatives with degree of zirconium recovery more than 99%. This process further provides an effective method for the separation and purification of zirconium from a variety of elements and/or naturally occurring ores.

An inorganic fullerene MoS2 nanoparticle with enclosed nested luminar structure used as the additive of lubricating oil is prepared through proportionally dissolving sodium sulfide and ammonium molybdate in water, reaction while adding the aqueous solution of polyethanediol, dripping hydrochloric acid to obtain MoS3 deposit, centrifugal separation, vacuum drying, hydrodesulfurizing at 500-1000 deg.C in quartz-pipe furnace under protection of Ar gas, and holding the temp for 5-10 hr.

Processes for the efficient and economical beneficiation of titaniferous ore are provided. A unique process for beneficiating ore comprising pretreatment of the ore by oxidation and reduction, followed by acid leaching with sulfuric acid has been developed. The acid used in this process may be recycled, which will thereby increase the efficiency of the process. Preferably the ore treated according to the present invention is ilmenite ore.

This invention relates to a method of treating titania slag to increase the leachability of impurities from the slag consisting of the steps of sizing the titania slag to a particle size from 75 to 850 mum; oxidizing the sized slag particles at a temperature from about 700° C. to below about 900° C. causing the iron present in the slag to concentrate at the exposed surfaces of the slag particles and/or causing an anatase phase to stabilize in the slag, causing a major portion of the iron in the Fe(II) state to convert to the Fe(III) state, and causing the titanium in the Ti(III) state to be converted to the Ti(IV) state; and reducing the oxidized slag in a reducing atmosphere from about 700° C. to about 950° C. to convert a major portion of the iron in the Fe(III) state to the Fe(II) state. The invention also relates to a method of beneficiating titania slag to increase the TiO2 content thereof wherein the above treated slag is leached with acid.

There are provided processes for preparing various products from various materials. For example, such processes are effective for extracting titanium and various other metals from various materials, thereby allowing for preparing products such as titanium chloride and titanium oxide. These processes can comprise leaching the starting material with HCl so as to obtain a leachate and a solid. The solid can be treated so as to substantially selectively extract titanium therefrom while the leachate can be treated so as to substantially selectively recover a first metal chloride therefrom.

Disclosed is a novel adsorbent for use in a ⁹⁹Mo/^99mTc generator, which is a medical diagnostic radioisotope generator, and in a ¹⁸⁸W/¹⁸⁸Re generator, which is a therapeutic radioisotope generator. The adsorbent composed of sulfated alumina or alumina-sulfated zirconia exhibits adsorption capacity superior to that of conventional adsorbents, and is stable and is thus loaded in a dry state in an adsorption column so that the radioisotope ⁹⁹Mo or ¹⁸⁸W can be adsorbed. Thus, it is possible to miniaturize the column, and such a miniaturized column is small, convenient to use, and highly efficient, and extracts a radioisotope satisfying the requirements for pharmaceuticals, and thus can be useful for radioisotope generators extracting ^99mTc or ¹⁸⁸Re.

This invention relates to a process for beneficiating a titaniferous ore. The process comprises leaching the titaniferous ore with sulfuric acid to form a leached ore, calcining the leached ore in the presence of oxygen to form a calcined ore, and leaching the calcined ore with sulfuric acid, hydrochloric acid, and/or nitric acid to form a beneficiated ore. The leached ore is not reduced prior to or following calcination.

The present invention relates to a two-stage leaching process using concentrated hydrochloric acid that upgrades a variety of inferior quality titanium-iron ores into premium titanium concentrate and iron oxide products. The ground ore is leached with two separate quantities of hydrochloric acid after which the dissolved titanium is precipitated from the filtered liquor by hydrolysis. The still soluble iron chlorides are then optionally subjected to oxyhydrolysis to recover iron oxide and HCl. The process was developed for low-grade ores (under 12% TiO₂), and can be naturally applied advantageously to higher grade titanium-bearing ores.

An improved process for recovering a titanium dioxide product from a titanium oxide-containing roasted mass of the type derived from roasting an ilmenite, anatase or perovskite ore by exploiting an organic acid, such as mixture of oxalic acid and ascorbic acid.

The invention discloses a method for preparing zirconium sulfate tetrahydrate with zirconium carbonate production wastewater. The method comprises the technical steps of: (1) adjusting a pH (Potential of Hydrogen) value of the zirconium carbonate production wastewater with dilute alkali, performing sedimentation, (2) pumping the wastewater into a plate-and-frame filter press for press filtration, purging with compressed air after the press filtration, removing a plate, obtaining zirconium hydroxide, (3) dissolving zirconium hydroxide in sulfuric acid or zirconium sulfate tetrahydrate mother liquor at a mass-volume ratio of 1:(1-3), heating to 50-60 DEG C to completely dissolve zirconium acyl hydroxide, filtering off mechanical impurities, and (4) adding concentrated sulfuric acid into filtrate to adjust a system sulfuric acid concentration to 50-70%, naturally cooling to 40 DEG C for crystallization, centrifuging, and obtaining zirconium sulfate tetrahydrate. The method is simple in technology, prepares zirconium sulfate tetrahydrate with the zirconium carbonate production wastewater, and prevents the zirconium carbonate production wastewater from influencing an environment; obtained zirconium sulfate tetrahydrate is high in purity and is up to a national first grade standard; since the zirconium sulfate tetrahydrate mother liquor is recycled, the production cost is lowered effectively; and environmental resources are saved.

A process for improving the grade and optical quality of zircon, comprising: baking a mixture of a zircon feed and concentrated sulphuric acid at a baking temperature in the range of from 200 up to 400° C., and for a time to form water leachable sulphates with impurities therein including at least iron and titanium; leaching the baked mixture to dissolve the leachable sulphates; and separating the zircon from the leachate containing the leached sulphates, which separated zircon is thereby of improved grade and optical quality.

Compositions and methods useful for removing toxic industrial compounds from air are disclosed, wherein said composition comprises a mixture of hydrous metal oxide and graphite oxide. In a most preferred embodiment the composition comprises a mixture of zirconium hydroxide and graphene oxide.