4results about "Alkali metal iodides" patented technology

The application discloses a preparation method of potassium iodide and ammonium iodide based on micro-chemical reaction technology, and comprises the following steps: (1) mixing hydrazine hydrate and potassium hydroxide according to a molar ratio of 4:1-1:8 to prepare 0.5 mol·L ‑1 Solution as the dispersed phase of the micro-reactor; (2) dispersing elemental iodine into water according to a molar ratio of 1:60-1:500 to prepare a suspension as the continuous phase; (3) pumping the solution prepared in the step 1 into the dispersed phase inlet at the same flow rate, pumping the iodine suspension prepared in the step 2 into the continuous phase, and carrying out reaction at normal temperature; and potassium iodide and ammonium iodide products can be obtained after concentration, crystallization and separation. The application realizes continuous, safe and efficient production of potassium iodide and ammonium iodide by using micro-chemical continuous reaction technology, and by skillfully selecting hydrazine hydrate as a reducing agent, potassium hydroxide as a pH regulator of a reaction system, and optimizing the raw material ratio and the feeding flow rate of the three.

To provide a compound capable of being used as a binder having ion conductivity and a battery including the compound. One of the present invention is a compound including P and S as constituent elements, and having: a group bonded to the above P and including one or more elements selected from the group consisting of O, N, and halogen; and a disulfide bond.

The present application relates to the technical field of potassium iodide, and provides a purification method of potassium iodide containing perfluorinated organic impurities, wherein the impurities in the potassium iodide crude product are perfluorinated organic compounds with the number of C atoms being greater than or equal to 6 and the mass content being greater than or equal to 20%, and the purification method comprises: adding the potassium iodide crude product into an alcohol lye to perform heating reflux to degrade the perfluorinated organic compounds; the alcohol lye is obtained by dissolving an alkaline compound containing an alkali metal or an alkaline earth metal in alcohol, and the mass concentration of the alkaline compound in the alcohol lye is less than or equal to 20%. The method of the present application is not only simple in operation and suitable for industrialization, but also can make the purity of the purified potassium iodide reach more than 98%, and the highest recovery rate can reach 97%, and the whole process does not produce three wastes, has low energy consumption and small risk, which is specifically reflected in that the amount of foam entraining particles during boiling is reduced, the risk of equipment and pipeline blockage is greatly reduced, the safety is high, and the presence of the alkali greatly increases the solubility of the perfluorinated organic impurities, and the purification efficiency is high.

A method for treating wastewater from the manufacture of polarizing plates, which can improve the recovery rate of potassium iodide. [Solution] A method for treating waste liquid from polarizing plate manufacturing includes a first concentration step of evaporating and concentrating the waste liquid from polarizing plate manufacturing to produce a first precipitate, a first solid-liquid separation step of performing solid-liquid separation of the first precipitate from the waste liquid from polarizing plate manufacturing to produce a first filtrate, a second concentration step of evaporating and concentrating the first filtrate to produce a second precipitate, a second solid-liquid separation step of performing solid-liquid separation of the second precipitate from the first filtrate to produce a second filtrate, and a recovery step of recovering potassium iodide from the separated second precipitate. The treatment method includes an iodine reduction step, prior to the first concentration step, of adding an iodine reducing agent to the waste liquid from polarizing plate manufacturing to reduce iodine to a reduction point.