2results about How to "Reasonable selection" patented technology

This invention provides a high-voltage DC SSPC and a method for charging capacitive loads, enabling the high-voltage SSPC to carry capacitive loads. The capacitive load circuit of this invention can adaptively distinguish whether the downstream load is short-circuited or capacitive. At the same time, this invention can adaptively adjust the upper limit of the capacitive load based on the power selection of the hardware current-limiting resistor. When the capacitive load of the downstream load exceeds the upper limit of the SSPC's capacitive load capacity, it can identify and shut down, protecting the capacitive load circuit from damage.

This invention discloses a method for extracting high-purity ammonium tetramolybdate from a waste oil hydrogenation catalyst. S1, Primary ammonia dissolution: 28% ammonia water, water, and molybdenum acid extracted from the waste oil hydrogenation catalyst are added to a primary dissolution vessel. The mixture is stirred until the molybdenum acid is fully dissolved. The reaction time is controlled to 1 hour. The pH of the dissolved solution is 7-8. The molybdenum acid has a water content of 35% and a Mo content of 46-50%. This invention employs a stepwise deep impurity removal process of "magnesium chloride for phosphorus removal + 231 resin for vanadium removal," and sets up dual phosphorus and vanadium content detection to ensure that phosphorus <0.01g / L and vanadium <0.01g / L before proceeding to subsequent processes. The molybdenum-vanadium separation coefficient of 231 resin is much higher than that of ordinary resin, effectively avoiding impurity entrainment.