51results about How to "Less impurity ions" patented technology

The invention relates to a production device and a production method of lithium hexafluorophosphate, and the method comprises the following steps: introducing phosphorus pentachloride and anhydrous hydrogen fluoride into a replacement reaction tank for reaction, and introducing the generated phosphorus pentafluoride into a synthesis reaction kettle; introducing anhydrous hydrogen fluoride and lithium carbonate into an acidification pool to prepare a hydrogen fluoride and lithium fluoride mixed solution; and feeding the phosphorus pentafluoride and the mixed solution into a circular reaction kettle for reaction, feeding excessive hydrogen fluoride and lithium fluoride into a synthesis reaction kettle for synthesis of lithium hexafluorophosphate, and feeding the generated product liquid into a crystallization tank for crystallization. And returning the rest mother liquor to a rectification refining section through a pump to participate in the reaction again. The hydrogen chloride gas generated by the circular reaction kettle can be absorbed to prepare industrial hydrochloric acid. The purity of the lithium hexafluorophosphate crystal produced by the system reaches 99% or above, and the moisture (mass fraction) can be controlled to be 5 * 10 <-6 > or below.

The invention discloses a method for preparing high-purity manganese sulfate and high-purity manganese carbonate by reduction leaching of pyrolusite through scrap iron. The method comprises the following steps of: performing reduction leaching on the pyrolusite with the scrap iron in a sulfuric acid medium to obtain manganese, regulating the pH value to be 5-6 by using a neutralization method, hydrolyzing ferric iron in the solution into an iron hydroxide precipitate, and filtering to obtain primary filtrate of manganese sulfate and filter residue; adding a vulcanizing agent into the primary filtrate for vulcanization to remove heavy metal ions, adding a fluorinating agent for removing calcium, magnesium and other ions in the solution, standing the solution and removing sediments; and concentrating and crystallizing the purified solution to prepare the high-purity manganese sulfate, or adding ammonium carbonate to prepare high-purity manganese carbonate, concentrating the filtrate andrecovering the ammonium carbonate, wherein the filter residue in the first step is leached by solution of dilute sulfuric acid, and the filtrate after filtration is subjected to calcium removal, standing and concentration to form polyferric sulfate. The method is low in cost and investment, is suitable for comprehensive exploitation and utilization of different grades of pyrolusite, can effectively utilize natural resources and also can create obvious economic benefit.

The invention relates to a method for producing water-soluble potassium ammonium phosphate from wet-process phosphoric acid. According to the method, a monoammonium phosphate solution is prepared from low-cost wet-process phosphoric acid as the raw material by the steps of desulfuration and defluorination and neutralization with ammonia; then the replacement reaction of the monoammonium phosphate solution and potassium chloride and the crystallization are carried out to obtain a water-soluble fertilizer which contains potassium dihydrogen phosphate as a main component and adopts ammonium dihydrogen phosphate as an auxiliary component, wherein the content of chlorine is smaller than 2%; and excess potassium chloride and nitrogen produce a by-product such as nitrogen phosphorus and potassium chloride water soluble compound fertilizer. Meanwhile, the by-product in the production process can be directly used as a citric acid soluble phosphatic fertilizer. The method has simple processes, and the prepared water-soluble ammonium potassium dihydrogen phosphate is high in purity, nutrient and potassium content. No waste residues are discharged in the whole process, so that the method is environment-friendly and has better social and economical benefits.

This invention discloses a method for preparing stannous sulfamate solution and an application thereof. The method comprises the following steps of: (1) taking stannous oxide, and adding pure water for rinsing; (2) mixing sulfamic acid and cleaned stannous oxide, and adding pure water, reducing agent and tartaric acid; heating the mixture to 60-90 DEG C, agitating and reacting for 2-4 hours to obtain solution A; (3) adding active carbon to the solution A, absorbing for 0.5-1.5 hours before filtering, and taking filtrate; (4) testing the content of stannous sulfamate in the filtrate and addingpure water to prepare the tin sulfamate solution with the needed concentration. The stannous sulfamate solution prepared by the method is high in purity and less in impurity ions; the preparation method provided by the invention has the advantages of simple process, less energy consumption, low cost and small pollution on the environment; and the method overcomes the disadvantages of the traditional method as follows: the operation cycle is long, the impurity ions are many and are difficult to treat, and the environment is polluted.

The invention discloses a red fluorescent powder for near-ultraviolet light excitation and a preparation method thereof. According to the stoichiometric ratio 2:(1-x):x, respectively take Li 2 MoO 4 Powder, La(No 3 ) 3 ·nH 2 O powder and Eu(NO 3 ) 3 The solution is used as raw material, where x=0~1.0; hydrothermal reaction at 240°C for 24h, then the precursor is centrifuged and dried at 525~550°C for 3~4h, and finally taken out and ground to obtain the target product La 1.0‑x Mo 2 o 9 :xEu 3+ Red fluorescent powder; using hydrothermal method to form a pure phase structure phosphor, the cost is low, after the hydrothermal reaction, the overall process is simple; the raw materials are lithium molybdate, hydrated lanthanum nitrate, europium nitrate and lithium hydroxide, and Compared with the target product, the amount of introduced impurity ions is small, which can improve the purity of the product; the doping method of the present invention helps crystallization, Li + The addition of ions promotes the formation of crystals; the phosphor has a strong charge transfer band, which has the highest intensity under the excitation of near-ultraviolet light from 335nm to 350nm, and its color coordinates are similar to standard red light, with high color purity and luminous intensity. Excellent performance.