39results about How to "Big reaction force" patented technology

The invention discloses a method for extracting tungsten from tungsten mineral by using soda and adopting high-pressure leaching process, comprising the following steps: adding soda and additives into primary tungsten autoclaving slag, carrying out secondary autoclaving at high temperature and pressure; separating the leaching solution from the slag; carrying out primary autoclaving to the tungsten by the leaching solution; separating the primary autoclaving slag from the crude sodium tungstate solution, wherein the primary autoclaving slag is used as the raw material; and mixing the tungstate with the secondary autoclaving leaching solution to prepare slurry. The liquid-solid ratio is controlled to be (3-5):1 in the step of adding the soda and the additives into the primary autoclaving slag and mixing to prepare the slurry, and the soda has the excess coefficient of 2.0-2.5. The liquid-solid ratio is controlled to be (3-5):1 in the step of mixing the tungstate with the secondary autoclaving leaching solution to prepare the slurry. The primary autoclaving temperature and the secondary autoclaving temperature are both 170-240 DEG C, the primary autoclaving pressure and the secondary autoclaving pressure are both 0.9-2.8MPa, and the primary autoclaving time and the secondary autoclaving time are both 2-4 hours. The additives are solid caustic soda and alumina. The method adopts the soda to autoclave the tungsten mineral to extract tungsten at counterflow by using soda at high pressure, so that the leaching rate of the tungsten mineral is more than 99%, the content of WO3 in the tungsten slag is less than 1.0%, the use amount of soda is reduced, and the content of soda in the leaching solution is reduced effectively.

The invention discloses a liquid-phase hydrogenation reactor and a hydrogenation method. The liquid-phase hydrogenation reactor includes an inner cylinder and a reactor shell, the inner cylinder is conical, an annular cavity is formed between the inner cylinder and the reactor shell, and the cross-sectional area of ​​the annular cavity gradually increases from bottom to top; the top of the inner cylinder is The upper head is connected to the raw material inlet of the top of the reactor, and the bottom of the inner cylinder is communicated with the bottom of the annular cavity; the middle of the reactor is horizontally arranged with a ceramic membrane nano / micron component, and the ceramic membrane nano / micron component is connected to external hydrogen; the inner cylinder is filled with Hydrogenation catalyst I, the annular cavity is filled with hydrogenation catalyst II, the activity of hydrogenation catalyst I is lower than that of hydrogenation catalyst II; the flow mode of the material in the inner cylinder is from top to bottom; the flow mode of the material in the annular cavity For bottom up. The method of the invention can effectively control the initial activity of the liquid phase hydrogenation reaction and improve the conversion rate in the later stage of the reaction through the internal structure of the reactor, the material flow mode and the catalyst gradation.