Vitina, Maruta

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

A floorboard includes a board body, a first coupling structure with a tenon and a second coupling structure with a mortise. The tenon includes a first side portion and a second side portion. A second side portion includes a first connecting surface and a second connecting surface. The mortise includes a first recess and a second recess. The second recess includes a third connecting surface and a fourth connecting surface. When two floorboards are connected, the first coupling structure of one of the two floors is matched with the second coupling structure of the other of the two floors, and the first connecting surface of one of the two floorboards is matched with the third connecting surface of the other of the two floorboards, so as to lock the connection of the two floorboards.

An electric lift device includes a frame assembly, a backrest, a bearing plate, at least two armrests and a driving mechanism. The frame assembly includes a first wheel frame, a second wheel frame, a first connection plate, at least two vertical rods, a sleeve rod and a second connection plate. The backrest is fixedly connected to an outer side of the sleeve rod. The bearing plate is connected to the sleeve rod. The at least two armrests are respectively provided at two lateral sides of the backrest. The driving mechanism is installed on a surface of the first connection plate, and is configured to drive the sleeve rod to move up and down.

A four-cylinder compressor, including a hollow base placed horizontally, a motor body fixed in the base, a cam mechanism in transmission connection to output shafts at two ends of the motor body and two cylinder groups arranged at the base. The cylinder groups are in transmission connection with the cam mechanism, each including a first cylinder and a second cylinder. The first cylinder and the second cylinder are fixedly arranged opposite to each other on the base along the vertical direction. The two first cylinders are connected, and the two second cylinders are connected. The four-cylinder compressor has a low center of gravity and good operation stability, and thus can bring better vibration performance and reliability.

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A full continuous-flow preparation method of L-camitine, including: mixing chlorine gas and a diketene solution via a first micromixer followed by transportation to a first microchannel reactor for continuous chlorination and esterification reaction to obtain 4-chloroacetoacetate; feeding the 4-chloroacetoacetate and a reductase to a second micromixer and a second microchannel reactor in sequence for continuous catalytic reaction to obtain (R)-4-chloro-3-hydroxybutyrate; simultaneously transporting the (R)-4-chloro-3-hydroxybutyrate and a trimethylamine solution to a third micromixer and a third microchannel reactor for continuous substitution and hydrolysis reaction; and subjecting the reaction mixture to desalination and concentration to obtain the L-carnitine. Compared to the existing batch reactor-based synthesis, the method of the disclosure has good safety, shortened reaction time, high degree of automation, desirable time-space efficiency and low energy consumption, and thus is suitable for the industrial production.

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