5results about How to "Purity effect" patented technology

The invention relates to a preparation method of an electronic grade caustic alkali solution, the mass fraction of the caustic alkali solution is 40-50%, and the content of transition metal ions is less than 5 ppb. The invention aims to provide the preparation method of the caustic alkali solution suitable for cleaning / etching the silicon wafer, the problem that transition metal ion impurities are easy to remain after the silicon wafer is cleaned / etched is solved, and the transition metal impurities in the caustic alkali solution are deeply removed mainly through a cooling crystallization process controlled by an additive. Compared with a mode of directly carrying out cooling crystallization and directly adding a chelating agent into the caustic alkali solution, the method provided by the invention fundamentally solves the problem that the content of transition metal impurities in the caustic alkali solution for cleaning the silicon wafer is too high, so that the silicon wafer is polluted.

This invention relates to a surface passivation method for high-purity manganese. The surface passivation method includes the following steps: (1) rinsing the surface of high-purity manganese with isopropanol, and then immersing it in a passivation solution for surface passivation; (2) rinsing with isopropanol and vacuum drying to complete the surface passivation of high-purity manganese. The passivation solution comprises tannic acid, phytic acid, benzotriazole, imidazole, and hydrogen peroxide. The surface passivation method provided by this invention is for high-purity manganese products removed from the electrolytic cell after electrolytic preparation of high-purity manganese. This surface passivation method, through the use of a specific passivation solution, can not only ensure the surface passivation effect of high-purity manganese, but also ensure the purity of the obtained high-purity manganese, avoiding the adverse effects of the passivation solution on the purity of high-purity manganese.

The application provides a method for co-production of battery-grade nickel sulfate and battery-grade iron phosphate, comprising the following steps: 1) performing first acid leaching treatment on a nickel-iron alloy pair by using an acid liquor to obtain a first acid leaching liquor and a first acid leaching residue; 2) performing second acid leaching treatment on the first acid leaching residue by using an oxidizing agent and an acid liquor to obtain a second acid leaching liquor and a second acid leaching residue; 3) performing extraction treatment on a mixed liquor comprising the first acid leaching liquor and the second acid leaching liquor by using an ion exchange resin to obtain a raffinate comprising ferrous ions; performing oxidation treatment on a system comprising the raffinate and a phosphorus source to obtain iron phosphate; 4) performing cleaning treatment on the ion exchange resin after the extraction treatment by using an acid liquor, then performing stripping treatment on the ion exchange resin by using an acid liquor and performing cooling crystallization treatment on a stripping liquor comprising nickel ions to obtain nickel sulfate. The method provided by the application has high nickel leaching rate and iron leaching rate, the prepared nickel sulfate and iron phosphate have high purity, and the process flow is simple.

The utility model discloses a flue gas recirculation device, and belongs to the technical field of flue gas circulation. A flue gas recirculation device comprises a spiral steel plate fixedly arranged on the outer circumference of a hollow column. The spiral steel plate is a stainless steel thin plate; the spiral steel plate is fixedly connected with the inner side of the shell; the upper end of the spiral steel plate is lower than the vent hole; the lower end of the air outlet pipe is elastically connected with a pressurizing block; the spiral steel plate is arranged, and the spiral space defined by the spiral steel plate, the hollow column and the shell is utilized, so that gas needs to flow out after being input through spiral rising motion, and flue gas and air are fully mixed in the process of promoting the gas to move.

The present invention relates to the technical field of plastic recycling, and in particular to a recycled plastic recycling and processing equipment with a cleaning function. The hardened paint layer remaining on the inner side of a paint bucket is scraped off cleanly by a cross cutter to avoid the subsequent hardened paint layer from being mixed into the molten plastic to be subsequently smelted, thereby avoiding affecting the purity of the molten plastic. At the same time, the cross cutter is also used to cut the paint bucket into four equal parts. When the cut paint bucket is manually poured into a crusher, the cut paint bucket is easier to get stuck in a crushing roller than a cylindrical paint bucket, avoiding slipping, which is beneficial to improving efficiency. A recycled plastic recycling and processing equipment with a cleaning function comprises a motor, a round rod, a cross cutter and a pressing assembly; a motor is fixedly connected to a connecting block; a round rod is fixedly connected to an output shaft of the motor, and the round rod is rotatably connected to a connecting block; and a cross cutter is detachably connected to the round rod.