12results about How to "Strong reduction" patented technology

The invention relates to the technical field of production of titanium dioxide by a sulfuric acid method, and discloses a composite reduction bleaching method for metatitanic acid in titanium dioxide by a sulfuric acid method, which comprises the following steps: taking metatitanic acid slurry, adding water to adjust the concentration of titanium dioxide, and heating and stirring; adding concentrated sulfuric acid for acidification; adding trivalent titanium to carry out reduction reaction; after the titanium trivalent reaction is finished, the pH value of the slurry is adjusted before thiourea dioxide is added; adding thiourea dioxide; after thiourea dioxide is added, the redox potential of the slurry is controlled within the range of 200 mV to 400 mV by supplementing a reducing agent, and the redox potential is maintained for 10-20 minutes; introducing inert gas for protection during a potential maintaining period; and carrying out solid-liquid separation and hot water washing to obtain bleached metatitanic acid. According to the present invention, the trivalent titanium and the thiourea dioxide are adopted to construct the composite reduction system so as to achieve the synergy of the strong reduction ability and the lasting reduction environment, such that the production cost of the bleaching process is reduced on the premise of the significant reduction of the trivalent titanium and the thiourea dioxide consumption.

The application belongs to the field of semiconductor chip assembly, and particularly relates to a method for eutectic sintering of semiconductor chips. The method uses formic acid as a protective agent during eutectic sintering, and scientifically sets the eutectic sintering temperature rising and constant temperature programs, so that heat can be effectively and uniformly transferred to the solder and the chip, the solder can be stably melted, the formation of voids is reduced, and the adverse effects of the voids on the qualified rate of the solder piece are reduced.

The invention relates to the technical field of new energy, in particular to a composite current collector assembly and a preparation method thereof, a pole piece assembly and a preparation method thereof and a battery. The composite current collector assembly comprises an insulating layer, a conductive layer and a weld-aid coating, the conductive layer is located on at least one side of the insulating layer, the conductive layer comprises an electrode active area and a tab blank area connected with the electrode active area, and the weld-aid coating is located on the conductive layer corresponding to the tab blank area. The raw materials of the weld-aid coating comprise modified rosin, organic acid, organic amine, a wetting agent, a surface active agent and a corrosion inhibitor. By selecting the raw materials of the weld-aid coating, the traditional transfer welding procedure can be omitted, the problem that the welding process is tedious is solved, and the welding quality is good.

The application discloses a catalyst, a preparation method thereof, and a process and equipment for synthesizing NS by oxidation. The activated carbon loaded composite catalyst claimed by the application comprises a main catalyst and an auxiliary catalyst, wherein the main catalyst is 2,4,6-trihydroxy pyrimidine, and the auxiliary catalyst is one or both of stannous oxide and palladium suboxide. In the application, the main catalyst and the auxiliary catalyst can be more adsorbed in the pore structure of activated carbon, and in the process of synthesizing rubber accelerator NS by oxidation, the reaction time of the reaction of synthesizing rubber accelerator NS by oxidation can be effectively shortened.

The application belongs to the technical field of electrocatalysis, and particularly relates to an electrocatalytic material and a preparation method thereof. Existing catalytic materials are unstable in the process of electrocatalytic hydrogen evolution. The application provides an electrocatalytic material, which is prepared from 2H-MoS2 and alkali metal carbonate through high-temperature calcination. Through a method of facilitating phase transition of 2H-MoS2 by means of molten alkali metal carbonate assisted intercalation, a ternary 1T'-MMoS2 (A=Na, K) material is prepared. The 1T'-MMoS2 is a stable ternary compound, so that the product avoids reverse transition from the 1T' phase to the 2H phase in the process of electrocatalytic hydrogen evolution, thereby exhibiting excellent stability.

The application discloses a wastewater treatment process and system based on combination of electro-catalysis and electro-deionization, and the process comprises the following steps: S1, inputting first wastewater into a cathode treatment chamber and inputting second wastewater into an anode treatment chamber; S2, applying voltage to make the cathode treatment chamber and the anode treatment chamber carry out electrodialysis, and at the same time, reduction reaction is synchronously carried out in the cathode treatment chamber and oxidation reaction is synchronously carried out in the anode treatment chamber; S3, making part of effluent water of the cathode treatment chamber enter a cathode concentrated water chamber after passing through a first anion exchange membrane, and then enter a fresh water chamber after passing through a first cation exchange membrane; making part of effluent water of the anode treatment chamber enter an anode concentrated water chamber after passing through a second cation exchange membrane, and then enter the fresh water chamber after passing through a second anion exchange membrane; S4, water in the fresh water chamber is finally discharged as qualified wastewater after passing through anion and cation exchange resin. The application integrates three kinds of processes into one, and can make effluent water quality stable to reach the standard of water reuse.

The application belongs to the technical field of water treatment agents, and particularly relates to a multifunctional composite water purifying agent and a preparation method thereof, which comprises the following raw materials in parts by weight: multifunctional water purifying powder 90-100 parts, bentonite 8-10 parts, sodium carboxymethyl cellulose 0.5-1.5 parts, sodium percarbonate 0.5-1 part and sodium citrate 0.5-1 part; the multifunctional water purifying powder comprises core layer material and shell layer slurry; the multifunctional water purifying agent of the application takes the multifunctional water purifying powder with a core-shell structure as a core, cooperates with bentonite, sodium carboxymethyl cellulose, sodium percarbonate and sodium citrate, realizes efficient and synchronous removal of heavy metals, organic matters, colority and microorganisms, and has the advantages of wide spectrum, stability and easy recovery.

The invention discloses a composite photocatalytic material with excess sludge as a carrier and a preparation method and application thereof.Porous conductive carbon obtained after carbonization and acid pickling of the excess sludge serves as a framework of the material, a core-shell structure unit composed of a CdS nanometer core and a C3N5 shell layer grows on the surface of the framework in situ, and an S-schema heterojunction is formed. The preparation method mainly comprises three steps of carbonization and purification of sludge, hydrothermal in-situ growth of CdS and vapor deposition wrapping of a C3N5 shell layer. The material fully utilizes the charge separation advantage of a conductive network and heterojunction of sludge carbon, shows excellent hydrogen evolution activity and stability under visible light, realizes high-value utilization of excess sludge, and provides a new material for efficient and low-cost photocatalytic hydrogen production.

The application relates to a kind of nanoparticles based on polyphenol compound modification and its preparation and application.The nanoparticles are mainly Cu 2‑x Se (0<=x<=1) nanoparticles, the surface is modified using polyphenol compounds, and nanoparticles with antioxidant protection are obtained by reasonable use of different surface modifiers.The preparation method can obtain nanoparticles with adjustable size, good water dispersibility, good biocompatibility and strong antioxidant effect.The application also discloses the application of nanoparticles after different modifications as new antioxidants, effective removal of reactive oxygen species (ROS), protection of neuronal cell damage and improvement of ischemia-reperfusion injury.

The application belongs to the technical field of environmental pollution wastewater treatment, and particularly relates to a method for selectively removing nitrate in wastewater based on ionizing radiation. The application adjusts the pH of wastewater and adds formate, utilizes the reaction of formate with hydroxyl radicals (•OH) and hydrogen radicals (•H) in the wastewater to be treated to generate carbon dioxide radicals (CO2 ‑ ), and utilizes the carbon dioxide radicals to selectively reduce nitrate (NO3 ‑ ) into nitrogen, so as to solve the problem of low efficiency of selective reduction of nitrate by existing ionizing radiation, and how to improve the efficiency of selective reduction of nitrate by ionizing radiation is a key problem in the application of the technology in wastewater treatment.

The invention relates to a method for preparing an engineering material brick after detoxification treatment of chromium metal smelting slag pollution, in particular to a method for preparing an engineering material brick after detoxification treatment of chromium slag pollution by reducing hexavalent chromium into trivalent chromium, and relates to a method for preparing a refractory brick after detoxification of chromium slag. Crystal lattices of dicalcium silicate, calcium aluminoferrite and calcium aluminate are destroyed with strong acid, so that hexavalent chromium is effectively reduced; 2, adding aluminum and magnesium strong reducing agents, namely adding powdery aluminum and magnesium as reducing agents into the metal chromium smelting slag after being soaked in phosphoric acid for 24 hours, and carrying out reduction reaction under a high-temperature condition; 3, analyzing the content of hexavalent chromium, adding the reducing agents aluminum and magnesium according to the content of hexavalent chromium, and enabling the particle size of the reducing agents to be less than 100 meshes; the density of the detoxified corundum brick product is 3.4-4.6 g / cm < 3 >, the corundum brick product is dense and free of holes, the corundum brick product comprises aluminum oxide and chromium oxide, and the refractoriness is higher than 1800 DEG C. The detoxicated corundum slag brick is suitable for use conditions of engineering materials, and the detoxicated corundum slag brick is used as a refractory material, so that resource reutilization is realized.

The invention provides a diterpenoid compound as well as a preparation method and application thereof. The structural formula of the diterpenoid compound is shown in the specification, wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and R11 are respectively and independently selected from hydrogen, C1-6 alkyl, C1-6 alkoxy and hydroxyl; or R5, R6 and atoms connected with R5 and R6 form a three-membered ring or a four-membered ring with an oxygen atom on a ring; and represents a single bond or a double bond. The diterpenoid compound has excellent reducing power, has a good scavenging effect on ABTS free radicals and DPPH free radicals, and has a good oxidative damage repairing capability.