2253 results about "Tungstate" patented technology

In one embodiment, a method for depositing a material on a substrate is provided which includes positioning a substrate containing a contact within a process chamber, exposing the substrate to at least one pretreatment step and depositing a fill the contact vias by an electroless deposition process. The pretreatment step contains multiple processes for exposing the substrate to a wet-clean solution, a hydrogen fluoride solution, a tungstate solution, a palladium activation solution, an acidic rinse solution, a complexing agent solution or combinations thereof. Generally, the HARC via contains a tungsten oxide surface and the shallow contact via may contain a tungsten silicide surface. In some example, the substrate is pretreated such that both vias are filled at substantially the same time by a nickel-containing material through an electroless deposition process.

A CMP composition having: a fluid comprising water and at least one oxidizing compound that produces free radicals when contacted with an activator; and a plurality of particles having a surface and comprising at least one activator selected from ions or compounds of Cu, Fe, Mn, Ti, or mixtures thereof disposed on said surface, wherein at least a portion of said surface comprises a stabilizer. Preferred activators are selected from inorganic oxygen-containing compounds of B, W, Al, and P, for example borate, tungstate, aluminate, and phosphate. The activators are preferably ions of Cu or Fe. Surprisingly, as little as 0.2 ppm and 12 ppm of activator is useful, if the activator-containing particles are suspended in the fluid as a slurry. Advantageously, certain organic acids, and especially dihydroxy enolic acids, are included in an amount less than about 4000 ppm. Advantageously, activator is coated onto abrasive particles after the particles have been coated with stabilizer.

The invention discloses a preparation method for a hydrogenation catalyst. The metal components of the catalyst comprise one or two metals from Co and Ni as well as one or two metals from Mo and W; carbamide or ammonia is used as a reaction addition agent; a method of reaction in-situ in the hole of a carrier is adopted to lead the metal active components to generate nickel molybdate (cobalt) or nickel tungstate (cobalt) compounds, thereby being capable of avoiding the reaction between the metals and the carrier, simultaneously leading the metal active components to be easier to be sulfurized and being capable of improving the activity of the hydrogenation catalyst.

The present invention relates to a phosphorus-free composite antiincrustation corrosion inhibitor. It includes polyaspartic acid and/or polyepoxysuccinic acid and at least one kind of scale inhibition and dispersion agent, in which the scale inbibition and dispersion agent is polymer containing carboxylic acid group, or it includes polyaspartic acid and/or polyepoxysuccinic acid, zinc salt, molybdate or tungstate and polymer containing carboxylic acid group. Said invention is applicable to treatment of circulating cooling water.

The invention discloses a composition used in a scale-inhibition corrosion inhibitor, a scale-inhibition corrosion inhibitor, and an application thereof. The composition used in the scale-inhibition corrosion inhibitor comprises cyclodextrin and/or a cyclodextrin derivative, a carboxylic-acid-group-containing homopolymer, a sulfonic-acid-group-containing copolymer, and selectively hydroxycarboxylic acid with a weight ratio of 1:0.2-20:0.04-15:0.2-30:0-20. The scale-inhibition corrosion inhibitor provided by the invention is environment-friendly. According to the invention, the application of phosphorus-containing compound or non-renewable molybdate or tungstate is prevented, such that the scale-inhibition corrosion inhibitor is phosphorus-free and nitrogen-free. The scale-inhibition corrosion inhibitor has high tolerance to calcium and alkali, resistance to corrosion of high-concentration chloride ion and sulfate ion, and wide applicability to water quality. Therefore, technical condition is provided for operation of circulation water under high concentration multiple and for reducing sewage discharge. The scale-inhibition corrosion inhibitor provided by the invention has excellent scale inhibition and corrosion inhibition performances in circulation water system application. With the scale-inhibition corrosion inhibitor, a dose is low, scale-inhibition treatment process is simple and substantial effect is provided. The scale-inhibition corrosion inhibitor is suitable for popularization.

The invention relates to a method for recovering non-ferrous metals from waste denitration catalysts, particularly relates to a method for recovering vanadium, tungsten and titanium from a waste vanadium-tungsten-titanium-based denitration catalyst, belonging to the field of non-ferrous metal recovery technologies. The method mainly comprises the steps of preparing the catalyst into powder with the grain size being smaller than 100 meshes, and adding concentrated alkali liquor; heating to react vanadium, tungsten and titanium with alkali, so as to produce slightly-soluble titanate, water-soluble vanadate and tungstate; filtrating to obtain a titanate filter cake, wherein titanate or titanic acid can be prepared from the filter cake; adding ammonium salt into a filtrate so as to precipitate ammonium metavanadate, and filtrating to obtain ammonium metavanadate and a new filtrate; adding concentrated acid into the new filtrate, thereby preparing solid tungstic acid. The method has the advantages of simple process, low energy consumption, good solid-liquid reaction contact, high vanadium, tungsten and titanium recovery rate, and the like.

A low-CTE packaging material for assembling a semiconductor die into a package and a method for assembling a semiconductor die into a package, in which the packaging material comprises a negative-CTE material. The low-CTE packaging material in accordance with the embodiments of the invention may be a die attach material, a lid attach material, or an encapsulant, such as a mold compound or glob-top material. Preferably, the negative-CTE material is a tungstate compound, such as zirconium tungstate, halfnium tungstate or a solution of zirconium and halfnium tungstate.

A compact includes a mixture of a solid binder and at least one nanopowder phosphor chosen from yttrium oxide, yttrium tantalate, barium fluoride, cesium fluoride, bismuth germanate, zinc gallate, calcium magnesium pyrosilicate, calcium molybdate, calcium chlorovanadate, barium titanium pyrophosphate, a metal tungstate, a cerium doped nanophosphor, a bismuth doped nanophosphor, a lead doped nanophosphor, a thallium doped sodium iodide, a doped cesium iodide, a rare earth doped pyrosilicate, or a lanthanide halide. The compact can be used in a radiation detector for detecting ionizing radiation.

A hydroprocessing catalyst has been developed. The catalyst is a unique transition metal tungstate material. The hydroprocessing using the crystalline ammonia transition metal dimolybdotungstate material may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

The present invention provides a method of treating high-molybdenum tungsten mineral or tungsten slime by means of three-ion column exchange molybdenum-eliminating technology so as to obtain ammoniumpara-tungstate with high purity at low cost. The treating process includes grinding, alkali leaching, filtering and concentration to obtain sodium tungstate crystal; water dissolving, filtering and sulfurizing sodium tungstate; ion exchange to eliminate molybdenum; desulfurizing sodium tungstate liquid; ion exchange to elimiante impurity and desorbing tungsten with ammonia water and ammonium chloride solution to prepare ammonium tungstate solution; and evaporation to obtain ammonium para-tungstate crystal. The present invention has low cost.

The invention provides a method for separating and extracting tungsten-molybdenum from mixed solution of tungstate-molybdate. The method is characterized by: adding aluminum salt or magnesium salt for purification and impurity removal, adding calcium carbonate to precipitate tungsten selectively to obtain artificial scheelite, making the liquid obtained after tungsten precipitation subjected to absorption by ion exchange resin or extraction by a solvent extraction agent to obtain ammonium molybdate, adding acid into the artificial scheelite for decomposition to obtain artificial tungstic acid, and performing ammonia dissolution and crystallization of the artificial tungstic acid to obtain ammonium tungstate. Therefore, effective separation and recovery of tungsten and molybdenum are realized; and in addition, the method has the advantages of short flow, high process adaptability, low consumption of reagents, low processing cost, high recovery rate of metal, good operating environment, and the like.

The invention discloses a method for treating low-grade tungsten concentrate and tungsten slag. The method comprises the steps of mixing low-grade tungsten concentrate or tungsten slag and coal powder with a reduction roasting enhancer, and then performing reduction roasting; grinding the product obtained through the reduction roasting, then performing neutral leaching to obtain a tungstate solution and leaching residues, and performing magnetic separation on the leaching residues by adopting a magnetic field so as to obtain iron concentrate and valuable metal tailings; removing silicon from the valuable metal tailings by using dilute hydrochloric acid and leaching out manganese from the valuable metal tailings by using concentrated hydrochloric acid in sequence, and then leaching out tantalum and niobium by using hydrofluoric acid to prepare tantalum and niobium products. By adopting the method, valuable elements including tungsten, iron, copper, manganese, bismuth, cobalt, tantalum, niobium and the like which are difficult to extract in the low-grade tungsten concentrate and tungsten slag can be efficiently enriched, separated and recovered effectively, so that the resource comprehensive utilization of the valuable elements in the low-grade tungsten concentrate or tungsten slag is realized; moreover, the method is simple in equipment, short in flow, simple and convenient in operation, is economical and reliable, and is favorable for industrial production.

A hydroprocessing catalyst has been developed. The catalyst is a unique transition metal tungstate material. The hydroprocessing using the crystalline transition metal molybdotungstate material may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

The invention relates to a method for separating tungsten and molybdenum. The method comprises the following steps: (1) adding acid into a tungsten-molybdenum mixed solution and adjusting pH value to obtain mixed sediment of tungsten acid and molybdenum acid; (2) adding hydrogen peroxide and acid into the mixed sediment to form peroxide tungsten acid and peroxide molybdenum acid; (3) heating an obtained mixed solution, adding tungsten powder, reacting and filtering to obtain tungsten acid sediment and a molybdenum-containing acid solution; (4) calcining the prepared tungsten acid to prepare tungsten trioxide or dissolving by using ammonium hydroxide to obtain an ammonium tungstate solution and then evaporating and crystallizing to prepare APT; (5) extracting the molybdenum in the obtained molybdenum-containing acid solution by using an extraction agent/ion exchange resin; and (6) reversely extracting molybdenum-containing organic phase/resin by using ammonium hydroxide to obtain the ammonium molybdate solution, and carrying out acid precipitation to obtain ammonium tetramolybdate. The production process of tungsten-molybdenum products is taken into account in the method, so that the separated tungsten acid or molybdenum can be directly used for preparing the products thereof; the separation effect is excellent; the operation process is simple and is liable to control; the industrial popularization and application are liable to implement.

The invention provides a method for extraction and separation of tungsten and molybdenum. Hydrogen peroxide is filled in the tungsten and molybdenum mixed solution, the pH value is regulated to be acidic, and the acid tungsten mixed solution is taken as a water phase feed liquid to carry out extraction and separation with an organic phase. The organic phase comprises trialkylphosphine oxide, tributyl phosphate and a diluting agent; the organic phase conducts the multi-stage extraction with the water phase feed liquid, molybdenum is extracted into the organic phase, and tungsten is left in a raffinate, so that the separation of tungsten and molybdenum is achieved. The load-bearing organic phase adopts an alkaline back-extraction agent to carry out back-extraction to obtain a molybdenum-contained solution, and the organic phase subjected to the back-extraction returns to the extraction process. Tungsten and molybdenum are extracted and separated in the tungsten and molybdenum mixed solution containing H2O2 by adopting a novel binary mixture extracting agent, the method has the advantages that extraction and the back-extraction are high in split-phase speed, the separation effect of tungsten and molybdenum is good, the tungsten co-extraction loss is low, the loss of the organic phase as well as the environmental pollution is low, the industrialization is easy to realize, and the method is especially suitable for separating tungsten and molybdenum in the tungstate solution with high molybdenum content.

The invention discloses a preparation method of cesium tungstate nanopowder. The preparation method comprises the following steps of A, dissolving reacting doses of tungsten raw materials and cesium carbonate raw materials into a solvent, drying the solution to obtain particles, and further smashing the obtained particles to obtain tungsten and cesium mixed powder; B, placing the tungsten and cesium mixed powder into a sealed reaction kettle with a stirring function, adding a reaction solvent in the sealed reaction kettle, and reacting at the temperature of 180-350 DEG C for 2-8h while stirring, wherein the mass of the reaction solvent is 1-3 times as mush as that of the tungsten and cesium mixed powder; and C, separating the reaction product obtained in the step B, washing by using deionized water or ethanol, then, drying, and milling by using a jet mill to obtain a target product, namely the cesium tungstate nanopowder. The cesium tungstate nanopowder prepared by using the preparation method is low in agglomeration degree; and the preparation method is high in production efficiency and low in cost.

The invention discloses a preparation method of a denitration catalyst. The method comprises the following steps: (1) with an intermediate product of metatitanic acid from a titanium dioxide factory as a raw material, washing with dilute nitric acid, weak aqua ammonia, deionized water respectively to remove impurity ions so as to prepare metatitanic acid slurry; (2) orderly adding ammonium tungstate, ammonium molybdate and ammonium metavanadate into the metatitanic acid slurry, beating the mixture by ultrasonic wave, adjusting the pH of the slurry to 4.0-6.5 by an acid; (3) allowing the mixed slurry to stand, drying to obtain the catalyst powder; (4) compacting and molding the catalyst powder into honeycomb by a mold, performing heat treatment at 200-600 DEG C for 4-10 hours to obtain the denitration catalyst of the invention. The method for preparing the denitration catalyst of the invention has low cost and simple process, and the denitration catalyst can increase the conversion rate of NO. The denitration catalyst of the invention can realize a conversion rate of NO in power plant flue gas flue gas components of up to above 97% at a reaction temperature of 350 DEG C.

The invention provides a mesoporous tungstate photocatalysis material and a preparation method thereof. According to the invention, metal inorganic salt and alkoxide are used as precursors, and molecular level mixing of metallic elements in a precursor solution is realized through addition of a chelating agent so as to avoid phase separation during evaporation of solvents; the method of an inorganic pore forming agent is used to allow a certain metallic element to be excessive in the process of synthesis and to exceed stoichiometric proportion, a part of the excessive metallic element participates in a reaction in the process of roasting to produce tungstate, and the rest part of the excessive metallic element is precipitated to form metal oxide or salt, functioning as a pore forming agent and stabilizing a meso-structure; the inorganic pore forming agent is removed by using treating methods of acid, alkali, dissolving and the like to obtain the mesoporous tungstate material. The invention has the advantages of a simple synthesis process, no harsh conditions and practicable operation. When applied in indoor air purification, the mesoporous tungstate photocatalysis material obtained in the invention has an obvious effect in removing formaldehyde, with a removal rate up to 92%.

This invention relates to a sort of low-phosphor scale-corrosion inhibitor which comprises 2-phospinobutane-1, 2, 4-tricarboylic acid (PBTCA) (or/ and 2-hydroxyphonoacetic acid (HPAA)), zinc salts, molyadate or tungstate and carboxyl-containing copolymer, copper corrosion inhibitor (needed or not conditionally). This low-phosphor scale-corrosion inhibitor can be used to treat recirculated cooling-water in ways such as adjusting pH of high-hardness and high-alkalinity water or treating low-alkalinity and low-hardness water. Its phosphor concentration in recirculated water is no more than 1mg/L, reducing the hazard of phosphor discharge to environment.

The invention relates to a non-phosphorus composite anti-incrustation corrosion inhibiter, the non-phosphorus composite anti-incrustation corrosion inhibiter comprises a) water-soluble molybdate and/or water-soluble tungstate; b) two different salts in water-soluble borate, water-soluble gluconate and water-soluble silicate; and c) at least an anti-incrustation dispersant, wherein the anti-incrustation dispersant is a non-phosphorus polymer containing carboxylic acid groups. The non-phosphorus composite anti-incrustation corrosion inhibiter of the present invention has the advantages of good combination property, possesses excellent function to block CaCO3 incrustation, has good capability for stabilizing Zn<2+> in water and corrosion slowing performance, can be used for circulating cooling water process and solves the environmental hazard caused by the drainage of phosphorus.

The present invention relates to catalysts, to processes for making catalysts and to chemical processes employing such catalysts. The catalysts are preferably used for converting acetic acid to ethanol. The catalyst comprises a precious metal and one or more active metals on a modified support. The modified support may comprise cobalt tungstate.