30results about How to "Reduce metal ions" patented technology

The present invention relates to novel silicon-based polymers, particularly silicon-based polymers having citrate groups, and their use as chelating agents, for forming and as stabilizers.

The invention discloses a semiconductor structure and a manufacturing method thereof. The method comprises steps: a base is provided, wherein the base comprises a substrate and a fin part protruding against the substrate, the substrate comprises a first area and a second area, and the first area and the second area are used for forming different types of transistors; a gate dielectric layer covering the top part and the side wall of the fin part is formed; a blocking layer is formed on the gate dielectric layer at the junction of the first area and the second area, wherein the blocking layer at least covers the gate dielectric layer in the second area at the junction; a second work function layer is formed on the gate dielectric layer in the second area and the blocking layer; and a first work function layer is formed on the gate dielectric layer in the first area. The blocking layer is firstly formed on the gate dielectric layer at the junction of the first area and the second area, the blocking layer at least covers the gate dielectric layer in the second area at the junction, the blocking layer can reduce the diffusion degree of metal ions of the first work function layer in the second work function layer, and bad influences on the performance of the second work function layer can also be avoided.

The invention provides a method and a system for biologically treating acidic mine wastewater and simultaneously recovering iron ions. The method comprises the following steps: (1) carrying out biomineralization on the acidic mine wastewater by acidophilic iron-oxidizing bacteria, carrying out cyclic biological reduction treatment by acidophilic iron-reducing bacteria, introducing the wastewater into an alkali regulating tank, circularly regulating the pH value, and circulating an effluent to a biomineralization treatment unit for cyclic treatment; and (2) after reaction for a period of time,leading the wastewater out from the tail end of the water collecting tank and can be subsequently connected with a lime neutralization treatment system, and recycling jarosite minerals or schwertmannite minerals in the biological mineralization unit. The screened bacteria are indigenous strains existing in the actual mine environment and can be completely suitable for mine wastewater treatment. According to the invention, the precipitation amount of iron in the acid wastewater is increased by adopting circular treatment, and the mine wastewater can completely reach the standard by subsequentlyconnecting lime for neutralizing treatment.

The invention relates to a production process for diodes. The production process comprises five steps of acid washing, electroplating, welding, insulation protection and post-treatment. The production process for the diodes has the advantages that the steps of acid washing, welding and welding are performed in sequence; a chip is subjected to acid corrosion before welding, so that solders and metal impurities in lead wires are prevented from reacting with an acid liquid to influence a corrosive rate of the chip in the acid washing process; metal ions generated by reaction of metal and acid are prevented from being adhered to the surface of the chip, so that large amounts of washing processes are removed and resources are saved; the faults such as electric degradation and high-temperature thermal breakdown of a product are avoided, so that the electric yield of the product is increased; and meanwhile, the metal content of a discharged washing liquid is reduced and the soil pollution is alleviated, so that the environmental protection is facilitated.

The invention provides a process for treating and recycling beneficiation waste water of lead and zinc sulfide ores, which comprises the steps of sequentially treating the beneficiation waste water in an ozone reactor and a biological active carbon reactor, and recycling the treated water in a beneficiation procedure. The ozone generator utilizes pure oxygen prepared by an oxygen generator, and the ozone is prepared by the ozone generator; the ozone is filled to the reactor by a hose pipe, and an aeration head is connected at the front end of the hose pipe; and the microorganisms at the biological active carbon segment of the biological active carbon reactor are inoculated by active sludge, and the microorganisms use glucose as a carbon source at the starting stage. The process of the invention has the advantages of effectively treating the beneficiation waste water of lead and zinc sulfide ores, the removal rate of the waste water TOC (total organic carbon) is larger than 80%, and the treated waste water is recycled in the beneficiation procedure without affecting the beneficiation indexes; and ozone oxidization is used for effectively removing the residual macromolecular organic matters in the beneficiation waste water with short reaction duration and high reaction efficiency, and the biological active carbon treatment process can be used for completely degrading the residual small molecular organic matters and greatly reducing the metal ions in the waste water. Furthermore, compared with the traditional treatment process of beneficiation waste water, the capital construction investment is reduced by 50%, and the operation cost is reduced by 70%.

The invention discloses a preparation method of porous silicon nitride ceramic with residues of low metal ions, which solves the problem that when the porous silicon nitride ceramic is prepared by liquid phase sintering, due to addition of mass sintering aid, mass glass phase and metal ions are remained in a crystal boundary so that the high temperature performance and electrical property of material are decreased. The method comprises the following steps: employing silicon nitride powder as a raw material, taking metal oxide Li2O with high temperature and strong volatility and a few of cooperated rare earth oxide as a sintering aid, performing pressureless sintering under nitrogen atmosphere, wherein the sintering temperature is 1600 DEG C, using high temperature to volatilize Li ions and Li-containing liquid phase, and removing Li ions and Li-containing liquid phase in vacuum heat treatment at 1500 DEG C or high temperature heat treatment at 1800 DEG C. The porosity of the porous silicon nitride ceramic is between 50%-60%, the bending strength is 65-150MPa, wherein Li content is lower than 0.03%, and the rare earth ion content is lower than 0.3%.

The invention relates to the field of silicon wafer cleaning, particularly to the field of silicon wafers after diamond wire cutting. The method for cleaning a silicon wafer after diamond wire cutting is carried out according to the following steps: 1. a step of cleaning the silicon wafer cut by a diamond wire in a citric acid aqueous solution; 2. a step of cleaning the silicon wafer in an alkaline cleaner; and 3. a step of cleaning the silicon wafer in hydrogen peroxide. A weak acid activation process is added before alkaline cleaning, so that metal ions remaining on the surface of the silicon wafer are less, a hydrogen peroxide cleaning process is added after alkaline cleaning to remove surface residual alkaline liquor, organic matter and metal ions, and at the same time, a surface damaged layer is better removed. The coverage rate of pyramid suede of the silicon wafer is relatively high in a subsequent battery etching process, and the suede is relatively uniform.

The invention discloses a preparation method of high-purity sugammadex sodium. The high-purity sugammadex sodium is prepared from inositol phosphate and derivatives thereof. The specific process comprises the following steps of adding a specific type of protective agent into a crude sugammadex sodium product, and performing recrystallizing under the protection of inert gas to obtain a pure sugammadex sodium product, wherein the protective agent is selected from the inositol phosphate and the derivatives thereof, such as inositol hexaphosphate and salts or esters thereof, partial degradation products of the inositol hexaphosphate, such as inositol pentaphosphate, inositol tetraphosphate, inositol triphosphate, inositol diphosphate and inositol monophosphate, and one or a mixture of two or more of the above-mentioned substances and salts or esters thereof in any proportion. The method is simple and convenient to operate, high in product purity, good in safety, few in anaphylactic reaction, good in economical efficiency and more suitable for industrial production.

The invention discloses a method for extracting total flavonoids from hibiscus manihot. The method comprises the following steps: (1) extracting, wherein an ethanol solution having the mass concentration of 40-99% is used as an extraction solution and a hibiscus manihot total flavonoid extract is obtained by virtue of microwave extraction; (2) purifying, namely enabling the hibiscus manihot total flavonoid extract to sequentially pass through hollow fiber ultrafiltration membranes having the molecular weight cutoffs of 10000-50000Da and 2000-6000Da and collecting penetration liquid; next, concentrating the penetration liquid by use of a nanofiltration membrane having the molecular weight cutoff of 100-500Da, thereby obtaining a hibiscus manihot total flavonoid concentrated liquid; (3) refining, namely adsorbing the hibiscus manihot concentrated liquid by use of a macroporous adsorption resin, orderly performing water washing and alcohol washing, and performing freeze-drying to obtain the hibiscus manihot total flavonoids. Compared with the prior art, the technology of the method is capable of greatly increasing the hibiscus manihot total flavonoid extraction ratio, and also capable of reducing the content of macromolecular saccharides and protein in the product, reducing the content of metal ions and inorganic salt in the product and improving the product purity.

The invention discloses a coagulant for industrial water pretreatment. The coagulant comprises coal-based granular activated carbon and polysilicate ferric aluminum in the mass volume ratio of (2:1)-(12:1); the coal granular activated carbon has the grain size of 0.35-0.45mm and the apparent density of 0.35-0.42; the polysilicate ferric aluminum is oxidizing polysilicate ferric aluminum; the mole ratio of silicon, aluminum and iron in the oxidizing polysilicate ferric aluminum is 1:1.5:2. Compared with the conventional coagulant, the coagulant provided by the invention has the advantages as follows: the coagulant can greatly improve the quality of outlet water, so that the requirement of the quality of inlet water of subsequent water treatment equipment can be completely met; the problems such as a poor coagulating effect caused by slow coagulant hydrolysis speed, multiple intermediate hydrolysis products, small coagulant particle density, and high metal ion content in the outlet water in water treatment application of the conventional aluminum salt, ferric salt and other coagulants can be solved better.

The invention discloses an ultrasonic extraction method of active ingredients of cistanche tubulosa. The method comprises the following steps: (1) grinding fresh cistanche tubulosa into powder, adding water, adding ascorbic acid, and uniformly stirring and mixing; (2) adding ethanol into the product obtained in the step (1), then placing at room temperature, extracting, carrying out filter pressing, and collecting an extracting solution; (3) adding an ionic surfactant into the extracting solution, stirring, then adding diallyl ether and a catalyst, and reacting; (4) adjusting the pH value of the product obtained in the step (2) to 1-3, stirring, standing, and centrifuging; adjusting the pH value to 7-8, adding ozone to react, and concentrating the extracting solution under reduced pressure; and (5) adding the extracting solution into the extracting solution for extraction, and then performing vacuum concentration and drying. The method can effectively reduce the loss of effective components in the extraction process of cistanche tubulosa.

The invention relates to the technical field of acid dyes, in particular to a preparation method of a blue acid dye finished product which is prepared by condensation reaction of a compound of formula(II) and a compound of formula (III) under the catalytic action of a catalyst C-1 under a base condition, the catalyst C-1 is Cu2O, and the catalyst C-1 is obtained by mixing copper sulfate, sucroseor glucose and sodium hydroxide for reacting, and filtering by suction. The preparation method can achieve higher conversion rate under a few catalyst dosage and few metal ions without refining treatment, mother liquor is recovered for application, no dust pollution is produced by spray drying, and the preparation method is clean and environmentally-friendly.

The invention relates to a sewage treatment apparatus, in particular to a sewage treatment tower. The sewage treatment tower comprises a tower body, wherein the top end of the tower body is a water storage tank, the bottom end is a water receiving tank, the tower body, the water storage tank and the water receiving tank are communicated with one another, a gravel layer, an active carbon layer anda water permeable ceramic plate layer are successively arranged in the tower body, a cavity is respectively arranged between every two of the three layers, and the tower body on the side wall of the cavity is provided with a decontamination opening. The sewage is filtered by virtue of the gravity of the sewage, by virtue of three-layer filtration, clean water with no precipitate, no peculiar smelland few metal ions can be obtained, and the clean water can be directly used as the industrial water.

The invention discloses a method for extracting and purifying active ingredients from cistanche tubulosa. The method comprises the following steps: (1) grinding fresh cistanche tubulosa into powder, adding water, adding ascorbic acid, and uniformly stirring and mixing; (2) adding ethanol into the product obtained in the step (1), then placing at room temperature, extracting, carrying out filter pressing, and collecting an extracting solution; (3) adding an ionic surfactant into the extracting solution, stirring, then adding diallyl ether and a catalyst, and reacting; (4) adjusting the pH value of the product obtained in the step (2) to 1-3, stirring, standing, and centrifuging; adjusting the pH value to 7-8, adding ozone to react, and concentrating the extracting solution under reduced pressure; and (5) adding the extracting solution into a macroporous resin column, carrying out gradient elution, collecting and combining eluent, and concentrating and crystallizing. The invention can effectively reduce the loss of effective components in the extraction process of cistanche tubulosa.

The invention discloses a refining method of high-quality sulfadoxine. Food-grade calcium hydroxide is adopted as a salt forming agent of sulfadoxine, a calcium salt aqueous solution of sulfadoxine issubjected to decoloration treatment, and then a purified aqueous solution of analytically pure glacial acetic acid is used for regulating the pH value in two times for fractional crystallization, sothat high-quality sulfadoxine is obtained. The sulfadoxine refined by using food-grade calcium hydroxide as a salt forming agent has low metal element residue, and the high-quality sulfadoxine obtained by two times of pH adjustment and fractional crystallization is white in appearance and light in solution color.

The invention discloses a method for extracting functional components of cistanche tubulosa. The method comprises the following steps: (1) grinding fresh cistanche tubulosa into powder, adding water, adding ascorbic acid, and performing uniform stirring and mixing; (2) mixing choline chloride, proline and water to form a mixed solution, then adding the mixed solution into a product obtained in the step (1), carrying out ultrasonic circulating extraction for 30-60 minutes, filtering and collecting an extracting solution; (3) adding lauryl sodium sulfate into the extracting solution, performing stirring, then adding diallyl ether and a catalyst, and performing reacting; (4) adjusting the pH value of the product obtained in the step (2) to 1-3, and performing stirring, standing and centrifuging; adjusting the pH value to 7-8, adding ozone to react, and concentrating the extracting solution under reduced pressure; (5) adding the extracting solution into absolute ethyl alcohol, and performing filtering, concentrating and crystallizing. The method can effectively reduce the loss of effective components in the extraction process of cistanche tubulosa.