6results about How to "Reduce passivation" patented technology

The invention discloses a magnesium-doped calcium carbonate adsorbent and a preparation method and application thereof, the chemical formula of magnesium-doped calcium carbonate is as shown in the following formula (1): MgxCa1-x (CO3), x represents the molar ratio of magnesium to calcium, 0 lt; xlt; and 0.200%. Compared with pure calcium carbonate, the adsorption rate of the adsorbent based on the magnesium-doped calcium carbonate material provided by the invention is greatly improved, so that passivation of the pure calcium carbonate in the early stage of adsorption is relieved. Under the condition of the same phosphorus adsorption amount, the adsorption rate of the adsorbent is obviously improved. Alternatively, under the same adsorption time, the phosphorus adsorption amount of the adsorbent provided by the invention is obviously improved. The adsorbent provided by the invention has good adsorption selectivity (competitive ion interference resistance), so that the adsorbent has high practical application value. In addition, as the preparation is simple and convenient and the cost is low, the compound can be used as an agricultural fertilizer slow-release agent, can maintain the phosphorus content in farmland for a long time, and is more beneficial to the growth of crops.

The utility model discloses a high sharpness injection needle, including needle tube and needle tip, the needle tip adopts three -stage tapering type multi -edge surface structure, and this three -stage tapering type multi -edge surface structure is composed of main cutting part, transition part and micro blade part, the main cutting part includes three symmetrical distribution's first inclined plane, and every first inclined plane bifurcates two second inclined planes to form transition part, and every second inclined plane bifurcates two third inclined planes to form micro blade part, the needle tip surface is equipped with a plurality of micro -groove, and the third inclined plane intersection of on micro blade part forms nanometer -class blade edge, and this blade edge edge is equipped with periodic micro sawtooth. The utility model discloses a needle tip is three -stage tapering type multi -edge surface structure, and the puncture resistance is reduced in stages, and the pain feeling is reduced, sets up micro sawtooth and can reduce the tissue contact area through " point cutting", and the local stress concentration when puncturing, and then delay passivation, sets up micro -groove and can guide the tissue fluid flow, destroys the negative pressure adsorption effect, and improves the needle insertion smoothness.

This invention relates to the field of water treatment technology, and more particularly to a method and system for treating coking nanofiltration concentrate. The method includes: pre-configuring a modified nickel plate anode electrode, a modified titanium plate cathode electrode, and multi-media filter media according to the water quality characteristics of the coking nanofiltration concentrate; feeding the coking nanofiltration concentrate into an electrocatalytic oxidation device for treatment, wherein the electrocatalytic oxidation device uses the modified nickel plate anode electrode as the anode electrode and the modified titanium plate cathode electrode as the cathode electrode; and pumping the effluent from the electrocatalytic oxidation device into a multi-media filter for filtration, wherein the multi-media filter contains multi-media filter media. By first subjecting the coking nanofiltration concentrate to electrocatalytic oxidation treatment, Cl... ‑ The anode loses electrons and is oxidized, producing a large number of active chlorine and other free radicals, which can rapidly degrade ammonia nitrogen. This allows relatively stable substances to react, and then a multi-media filter is used for filtration, which can economically and efficiently remove COD and ammonia nitrogen from coking nanofiltration concentrate.

This invention relates to the field of metal sheet processing technology and discloses a steel plate shearing device, including a frame and an upper blade beam. A support platform is fixedly installed on the inner wall of the frame, and a positioning cylinder is provided in the support platform. The upper blade beam is slidably connected in the positioning cylinder, and an installation groove is opened in the upper blade beam, in which an upper blade is installed. A lower blade holder and a drive mechanism are also fixedly installed on the frame, and a lower blade is provided in the lower blade holder. A guard plate is hinged to both sides of the upper blade beam by an elastic element, and a grinding roller is rotatably installed on the end of the guard plate near the lower blade holder. A first air bladder is installed in the positioning cylinder, and an expansion element is provided in the upper blade beam. The first air bladder and the expansion element are connected by an air pipe. The upper blade beam descends and compresses the first air bladder, and the air pressure is transmitted to the second air bladder in the upper blade beam through the air pipe. This drives the wedge block mechanism to force the guard plate to flip outward, so that the grinding roller automatically moves away from the cutting edge at the moment of shearing to avoid interference. During the return stroke, it automatically resets and sticks to the blade surface for micro-grinding, realizing online uninterrupted grinding.

The application discloses a preparation method of functionalized iron oxide nanoparticles. Firstly, the interlayer distance of graphite is increased under the action of a bicarbonate ammonia dispersant through high-energy ball milling treatment, and bismuth trisulfide which can inhibit hydrogen evolution is uniformly loaded on the graphite powder through the ball milling effect; then, the formed iron oxide and bismuth trisulfide are fully mixed through an in-situ deposition method; after further high-energy ball milling treatment to form uniform particles, the particles are subjected to hydrothermal treatment together with carbon nanotubes, so that the carbon nanotubes and the graphite and iron oxide particles form an interwoven network structure, a large amount of space is provided in the electrode, and the interlayer structure of the graphite also fully weakens the passivation phenomenon of the iron electrode. When the functionalized iron oxide nanoparticles are applied to an iron-air battery, the main problems existing in the iron-air battery can be solved in a targeted manner, and the application has important practical significance.

The application discloses a composite seed for inducing target ion reaction in water and a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method of the composite seed is as follows: target cations and target anions are selected according to target ions to be reacted; a porous carrier is soaked in a first solution containing the target cations; a second solution containing the target anions is added dropwise under stirring, and the dropping speed is controlled to make the supersaturation degree of the system lower than the critical supersaturation degree of homogeneous nucleation, so as to force the target cations and the target anions to react on the inner surface of the pores of the carrier, generate nanocrystal nuclei in situ and grow; and the composite seed is obtained through aging, solid-liquid separation, washing and drying. The nanocrystal nuclei have the same crystal structure as the composition of the target ions to be reacted. Through the in-situ loading process, the nanocrystal nuclei are firmly loaded in the pores of the porous carrier, and the target crystal nucleus design is combined, so that the reaction efficiency of the fluidized bed is remarkably improved, the activity of the crystal nucleus is long-lasting, and the composite seed has a good industrial application prospect.