510 results about "Metallic impurities" patented technology

The invention discloses a production process of ultra-high-purity isopropanol, which comprises the following process steps of: (1) delivering a feed stream containing at least 98% of industrial grade isopropanol into a molecular sieve adsorption tower from the bottom of the molecular sieve adsorption tower, dehydrating through a molecular sieve, and then flowing out of the top of the tower to obtain high-purity isopropanol of which the moisture content is less than 100ppm; (2) filtering the high-purity isopropanol taken out of the molecular sieve adsorption tower by using a filter so as to remove particles of which the sizes are more than 1mum; and (3) transferring the high-purity isopropanol which is qualified by filtering into a distillation tower and a rectification column for rectifying, then transferring the rectified high-purity isopropanol into a condenser to be condensed into high-purity liquid isopropanol, enabling the condensed high-purity liquid isopropanol after rectifying to pass through a deionized resin tank, and deionizing through ionic resin so as to obtain ultra-high-purity isopropanol of which the metallic impurity is less than 0.1ppb. The production process disclosed by the invention is carried out under the normal pressure, and has the advantages of mild reaction conditions, simple operation processes and good safety performance.

An apparatus and method for protecting die corners in a semiconductor integrated circuit. At least one irregular seal ring having two sides can be configured, wherein the irregular seal ring is located at a corner of a die utilized in fabricating a semiconductor integrated circuit. A dummy configuration for stress relief can then be arranged, wherein the dummy configuration is located at the two sides of the at least one irregular seal ring, thereby protecting the corner of the die against thermal stress and the semiconductor integrated circuit against moisture and metallic impurities. The irregular seal ring can be configured to generally comprise a non-rectangular seal ring. The irregular seal preferably comprises an octangular seal ring.

A process for upgrading an oil stream by mixing the oil stream with a water stream and subjecting it to conditions that are at or above the supercritical temperature and pressure of water. The process further includes cooling and a subsequent alkaline extraction step. The resulting thiols and hydrogen sulfide gas can be isolated from the product stream, resulting in an upgraded oil stream that is a higher value oil having low sulfur, low nitrogen, and low metallic impurities as compared to the oil stream.

An embodiment of the invention is directed to a treatment method for reducing the level of metallic and nonmetallic impurities in an oil. The method includes the step of contacting the oil with a porous silica adsorbent material. The adsorbent material is characterized by a Brunauer-Emmett-Teller (BET) surface area value (total) of at least about 15 m²/g; and a Barrett-Joyner-Halenda (BJH) pore volume (total) of at least about 0.5 cc/g.

The present invention discloses methods to remove impurities in polymeric materials in order to improve the opto-electronic characteristics of devices fabricated from these polymers. The polymers include but not limited to polyarylenes, polyarylenevinylenes, polyaryleneethylnylene, polyfluorenes, polyanilines, polythiophenes, polypyrroles, and any conjugated co-polymers. The methods involve the selection of a scavenger or chelating agent and use it to remove metallic impurities from the polymers. The methods involve dissolving the polymer in a suitable solvent, adding a scavenger, mixing to form a scavenger, containing phase, and finally separating the scavenger containing phase from the polymer phase. According to this invention, it is preferable for the selected scavengers to have functional groups which can chemically react with metallic species and form a coordination compound that is not soluble in a selected solvent. The selected scavenger can be used in a free stand form or carried by either organic or inorganic media.

The present invention relates to a cleaning solution capable of removing efficiently at the same time particles and metallic impurities from a substrate surface without corroding metallic materials.

The cleaning solution for cleaning substrates of electronic materials comprises an organic acid compound and at least one selected from the group consisting of dispersants and surfactants.

The invention discloses a recycling method for disqualified lithium ion battery negative electrode materials in a graphite system. The recycling method comprises the following steps that (1) a pole piece of the negative electrode in a disqualified lithium ion battery is put into a separation solvent, a thickening agent between a graphite sheet and a current collector is dissolved, and then the graphite sheet is not firmly attached onto the current collector; (2) graphite and the current collector processed in the step (1) are sieved, and graphite slag is obtained; (3) the graphite slag is subjected to oxidation reaction treatment, metal impurities in the graphite slag are removed, and graphite slurry which is primarily purified is obtained; (4) the graphite slurry is placed in a muffle furnace at 650-700 DEG C and keeps the temperature for 1-2h, impurities in the graphite slurry are removed, and high-purity graphite powder is obtained; and (5) graphite is subjected to surface modification, and graphite powder for electrodes of the battery is obtained. The method can be used for efficiently recycling graphite in negative electrode materials and realizing graphite recovery and cyclic regeneration.

The invention discloses a method for preparing a ternary positive electrode material precursor by virtue of waste batteries. The method comprises the steps of detaching waste batteries, roasting the detached waste batteries and carrying out sulfuric acid dissolving to obtain a waste battery positive electrode material, then separating and removing metal impurities in the waste battery positive electrode material by virtue of an extraction method to obtain a sulfate solution, supplementing manganese or aluminum to prepare a mixed solution for preparing the ternary positive electrode material precursor, then sequentially adding ammonia water and a sodium hydroxide solution, reacting to generate ternary positive electrode material precursor precipitates, and finally washing and drying to obtain the ternary positive electrode material precursor. According to the method, the cyclic utilization of resources of nickel and cobalt in waste batteries is realized, and the environmental pollution caused by heavy metals is avoided; furthermore, a nickel-cobalt-aluminum precursor and a nickel-cobalt-manganese precursor are produced from the recycled waste batteries, so that the requirements on primary mineral resources are lowered, and the purchase costs of nickel and cobalt are lowered; the method adopts a simple technological process and is applicable to industrial large-scale production.

The invention provides a system for separating and purifying trichlorosilane in production process of polysilicon and an operation method thereof. The system consists of a rectification working section and a recovery refining working section; wherein, the rectification working section comprises six towers, and the recovery refining working section includes three towers; the connection mode of the six towers of the rectification working section is that a lightness-removing tower I, a lightness-removing tower II, a weight-removing tower, a secondary lightness-removing tower, a secondary weight-removing tower I and a secondary weight-removing tower II are sequentially connected with each other; the connection mode of the three towers of the recovery refining working section is that a lower-removing tower, a higher-removing tower and a product refining tower are sequentially connected with each other. Chlorsilane rectification technical equipment can be one of main technical bottlenecks limiting the production of the high-quality polysilicon material in China. The invention can achieve the separation requirements and energy-saving aim under the condition that the mass flow rate elastic ratio between feeding of the rectification working section and feeding of the recovery working section is 1:1-1:5. The rectification technique is simplified and optimized, the separation efficiency is improved, the energy consumption of rectification products is reduced, the reliability and stability of system operation can be enhanced, and the content of phosphorus, arsenic, boron and metallic contamination in the rectification products can be lowered.

The invention provides a recovery method for a waste ferric trichloride etching liquid. The method adopts integrated membrane electrolysis and extraction technology and comprises the following steps: providing an electrolytic tank, wherein an ion exchange membrane is arranged in the electrolytic tank to divide the electrolytic tank into an anode chamber and a cathode chamber, and a cathode and an anode are respectively positioned in the cathode chamber and the anode chamber located at two sides of the ion exchange membrane; adding the waste ferric trichloride etching liquid into the cathode chamber and carrying out membrane electrolysis so as to reduce Fe3+ ions into Fe2+ ions; carrying out extraction on a solution obtained after electrolysis in the cathode chamber to remove impurity metals so as to obtain an extract phase solution and a metal impurity-removed phase solution and delivering the metal impurity-removed phase solution to the anode chamber for membrane electrolysis so as to oxidize Fe2+ ions into Fe3+ ions; and recovering a solution obtained after electrolysis in the anode chamber. Compared with conventional processing technology for the waste ferric trichloride etching liquid, the recovery method provided by the invention has the advantages of short and simple process flow, no generation of secondary pollution, no discharge of waste gas, waste water and industrial residue, low production cost, applicability to large-scale treatment, treating capacity of more than ten thousands every year and good environmental and economic benefits.

The invention relates to a method and a system for refining crude brine. The method comprises the following steps of: performing pre-reaction; pressurizing and dissolving gas; pretreating; performing post reaction; filtering by using a membrane; and filtering off residual slag particles by using a membrane filter to obtain the refined brine. By the method and the system for refining crude brine, under the condition of not introducing new impurities, various metal impurity ions are efficiently flocculated and precipitated, so that problems of great mineral salt impurity fluctuation and overproof Fe and Al ions are solved, the high quality of the finished brine product and the high-efficiency and normal operation of subsequent ion-exchange membrane electrolysis can be ensured, and the aim that mineral salt replaces sea salt to serve as chlor-alkali electrolysis raw salt is fulfilled; moreover, brine sludge emission and treatment cost can be obviously reduced, and the method and the system have good emission reduction effect and good environment-friendly property.

Metallurgical grade silicon is purified by removing metallic impurities and non-metallic impurities. The object is to produce a silicon species that is suitable for use as solar grade silicon. The process involves grinding metallurgical grade silicon containing metallic and non-metallic impurities to a silicon powder consisting of particles of silicon having a diameter of less than about 5 millimeter. While maintaining the ground silicon powder in the solid state, the ground silicon powder is heated to a temperature less than the melting point of silicon (1410 DEG C) under reduced pressure. The heated ground silicon powder is maintained at that temperature for a period of time sufficient to enable at least one metallic or non-metallic impurity to be removed from the metallurgical grade silicon.

The invention relates to a ferronickel smelting technology which takes the production waste of nickel oxide ore and stainless steel as raw material. The ferronickel smelting technology comprises the following steps: the nickel oxide ore and the stainless steel with the grain diameter of below 15mm are smelted to remove dust and stainless steel acid cleaning sludge to obtain mixed ore by mixing; the mixed ore and coke powder and industrial honey are mixed to make lump ore; the lump ore is calcined to obtain calcined ore; the calcined ore and coke are sent into an ore heating furnace to obtain the ferronickel by smelting. The technology is a novel ore heating furnace ferronickel-smelting technology, and realizes the recycling and reuse of the production waste of the stainless steel, thus solving the pollution problem of the waste to the environment; simultaneously, elements such as the ferronickel, etc. in the production waste of the stainless steel can be effectively recycled, thus avoiding the waste of mineral resources; traditional solvents such as fluorite and dolomite, etc. are not needed to be used, thus reducing the discharging pollution of fluoride and the possibility of introducing other metallic impurities into the ferronickel; by adopting the technology of the invention, power consumption can be reduced by 300 degrees for producing one ton of the ferronickel.

[Purpose] To provide a cleaning liquid composition that has excellent removability for metallic impurities and particulates, does not cause corrosion of Cu, and can clean a semiconductor substrate having copper wiring in a production process for an electronic device such as a semiconductor device.

[Solution means] A cleaning liquid composition for cleaning a semiconductor substrate having copper wiring, the cleaning liquid composition containing one or more types of basic compound containing no metal, and one or more types of phosphonic acid-based chelating agent, and having a hydrogen ion concentration (pH) of 8 to 10.

The invention relates to a method for producing high-purity metal chromium by using a carbon reduction method. The method comprises the following steps of: uniformly mixing chromic oxide powder and carbon black powder, adding deionized water or alcohol to form a wet mixed material, carrying out press forming, and drying, thereby obtaining a mixed material block; putting the mixed material block in a vacuum furnace, and enabling chromic oxide to be reduced by carbon black under high-temperature vacuum conditions, thereby obtaining crude chromium; introducing gaseous carbon monoxide, and carrying out heat preservation for 3-8 hours at the temperature of 1,300-1,500 DEG C; introducing gaseous carbon dioxide, and carrying out heat preservation for 3-8 hours at the temperature of 800-1,000 DEG C; and cooling down, and discharging, thereby obtaining a high-purity metal chromium block. According to the method, a gas-solid reduction manner is adopted to remove residual raw materials and non-metallic impurities, so that the production cost is reduced, and the reduction time is shortened; and the produced high-purity metal chromium has the purity of 99.96-99.98%, the oxygen content less than 0.03%, the sulfur content less than 0.01% and the carbon content less than 0.01%, thereby meeting the standards of the high-purity metal chromium.

A method for using relatively low-cost silicon with low metal impurity concentration by adding a measured amount of dopant and or dopants before and/or during silicon crystal growth so as to nearly balance, or compensate, the p-type and n-type dopants in the crystal, thereby controlling the net doping concentration within an acceptable range for manufacturing high efficiency solar cells.