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49results about How to "Unexpected effect" patented technology

Treatment method of tin anode slurry

The invention relates to a treatment method of tin anode slurry, which belongs to the technical field of vacuum metallurgy of non-ferrous metals. The treatment method of the tin anode slurry comprises the following steps of: reducing and decomposing lead-antimony composite compound carbon in the tin anode slurry into lead oxide and antimony oxide by using naturally stacked oxidized tin anode slurry as the material through two-step vacuum melting, quickly evaporating to remove the lead oxide and the antimony oxide to obtain residuum; and reducing the residuum, so that tin dioxide in the residuum is reduced to obtain crude tin. According to the treatment method of the tin anode slurry, the lead removing rate of the tin anode slurry is not lower than 99%, the antimony removing rate is not lower than 92%, the direct tin yield is not lower than 94% and the tin content in the crude tin is not less than 94wt%. The treatment method of the tin anode slurry disclosed by the invention can be used for simultaneously removing the lead and the antimony by one step, simplifying the treatment process of the tin anode slurry and lowering the production cost. Compared with the existing tin anode slurry treatment process, the treatment method of the tin anode slurry disclosed by the invention has the advantages of being simple in process, low in energy consumption, small in smoke gas pollution and the like.
Owner:CENT SOUTH UNIV

VCSEL device with high-dielectric-constant limiting hole and preparation method thereof

The invention discloses a VCSEL device with a high-dielectric-constant current limiting hole and a preparation method thereof. An epitaxial structure of the device sequentially comprises a substrate, a buffer layer, a nitride epitaxial DBR and an N-type semiconductor transmission layer in the epitaxial growth direction. The N-type semiconductor transmission layer is divided into two parts, wehrein the lower layer completely covers the nitride epitaxy DBR. A multi-quantum well layer, a P-type current blocking layer and a P-type semiconductor transmission layer are sequentially arranged on the N-type semiconductor transmission layer; a P-type heavily-doped semiconductor transmission layer; and the outer side of the upper surface of the P-type heavily-doped semiconductor transmission layer is provided with an annular high-dielectric-constant insulating layer which is made of non-doped HfO2 or Ta2O5. Compared with a device with a tunneling junction, the device with the high-dielectric-constant current limiting hole has the advantages that the process time can be reduced by nearly 40%, the light-emitting threshold value can be reduced by about 0.5 mA, and the output power at the temperature of 80 mA is improved by 14.3% compared with that of a conventional device.
Owner:HEBEI UNIV OF TECH

Extraction system and method for separating magnesium and extracting lithium from magnesium containing brine with secondary amide/tertiary amide complex solvent and application of extraction method

The invention discloses an extraction system and method for separating magnesium and extracting lithium from magnesium containing brine with a secondary amide/tertiary amide complex solvent and application of the extraction method. The extraction system contains secondary amide and tertiary amide, and each of the secondary amide and the tertiary amide is composed of a single compound or a mixtureof two or more compounds. The total number of carbon atoms in a molecule of the secondary amide ranges from 12 to 18, the total number of carbon atoms in a molecule of the tertiary amide ranges from 18 to 32, and the solidifying point of the extraction system is lower than 0 DEG C. Single-stage or multi-stage counter-current extraction is carried out under the condition that the volume ratio of anorganic phase to a brine phase is (1-10):1, the density of the brine is 1.25-1.38 g/cm<3>, and the temperature ranges from 0 DEG C to 50 DEG C; and a water phase low in magnesium-lithium ratio is obtained through reextraction, and lithium chloride, lithium carbonate and lithium hydroxide products are obtained through concentration, purification and preparation. The extraction system and method for separating magnesium and extracting lithium from the magnesium containing brine with the secondary amide/tertiary amide composite solvent and the application of the extraction method have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, and the viscosity and other physical characters of the complex solvent are improved through the tertiary amide; the multi-stage extraction rate of Li+ is high, the magnesium-lithium separation coefficient is large, water is used for reextraction, and acid-base consumption is greatly reduced; and the extraction separation technological process is short, the extraction system is small in dissolution loss, and high industrial application value is achieved.
Owner:XIANGTAN UNIV

Extraction system and extraction method for extracting lithium from magnesium-containing brine by using secondary amide/alkyl ester complex solvent, and application thereof

The invention discloses an extraction system and an extraction method for extracting lithium from magnesium-containing brine by using a secondary amide/alkyl ester complex solvent, and application thereof. The extraction system contains secondary amide and alkyl ester which are respectively prepared from a single compound or a mixture of more than two compounds; in the molecules, the totals of carbon atoms are respectively 12 to 18 and 8 to 20; and the freezing point of the extraction system is smaller than 0 DEG C. The extraction method comprises the steps of carrying out single-stage or multi-stage counter-current extraction under the conditions that the volume ratio of an organic phase and a brine phase is 1 to 10:1, the brine density is 1.25 to 1.38g/cm<3> and the temperature is 0 to 50 DEG C, carrying out back-extraction to obtain a low-magnesium-lithium-ratio water phase, and obtaining lithium chloride, lithium carbonate and lithium hydroxide products through concentration, purification and preparation. The extraction system and the extraction method for extracting the lithium from the magnesium-containing brine by using the secondary amide/alkyl ester complex solvent, and the application thereof provided by the invention have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, the physical properties such asviscosity of the complex solvent is improved through alkyl ester, the Li+ multistage extraction rate is high, the lithium-magnesium separation coefficient is large, and the acid-alkali consumption isgreatly reduced due to back-extraction by water; and the extraction separation process flow is short, and the extraction system is low in solution loss and has a favorable industrial application value.
Owner:XIANGTAN UNIV

Extraction system and extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide/alkyl ketone complex solvent and application of extraction method

The invention discloses an extraction system and an extraction method for separating magnesium and extracting lithium from magnesium-containing brine with a secondary amide/alkyl ketone complex solvent and application of the extraction method. The extraction system contains secondary amide and alkyl ketone each of which consists of a single compound or more than two mixtures; the total number of carbon atoms in a molecule of the secondary amide and the total number of carbon atoms in a molecule of the alkyl ketone are 12-18 and 8-12 respectively; and the solidifying point of the extraction system is lower than 0 DEG C. Single-stage or multistage counter-current extraction and back extraction are performed under the conditions that the volume ratio of an organic phase to a brine phase is (1-10) : 1, the density of the brine is 1.25-1.38 g/cm<3> and the temperature is 0-50 DEG C to obtain an aqueous phase low in magnesium and lithium ratio, and concentration, impurity removal and preparation are performed to obtain a lithium chloride product, a lithium carbonate product and a lithium hydrate product. The extraction system and the extraction method have the excellent effects a secondary amide extraction agent is simple in molecular structure and easy to produce, and the alkyl ketone improves physical properties, such as the viscosity of the complex solvent, and the like; the multistage extraction rate of Li<+> is high; the magnesium and lithium separation coefficient is big; back extraction is performed with water, so that acid and alkali consumption is greatly reduced; the extraction and separation process flow is short; the extraction system has small solvent loss; and the extraction system and the extraction method have high industrial application value.
Owner:XIANGTAN UNIV
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