31 results about "Oxalate crystals" patented technology

The invention discloses a method for preparing a solid electrolyte by using lithium lanthanum zirconium oxide precursor coated powder. The method specifically comprises the steps of dissolving a certain amount of lanthanum nitrate and zirconium nitrate into water, adding a precipitator, namely ammonium carbonate, controlling the pH value to ensure that La<3+> and Zr<4+> ions are simultaneously precipitated, and filtering and washing the precipitate; weighing a certain amount of lithium oxalate, dissolving lithium oxalate into water, adding the precipitate into the lithium oxalate solution, stirring, evaporating, crystallizing, and separating out lithium oxalate crystal on the surface of the precipitate to form precursor powder with a coated structure. The prepared powder has the advantages of uniform mixing, fine grains, high purity and the like; through the formed specific coated structure, the calcination temperature of the powder is low, the sintering time of the powder is short, and the room-temperature lithium ion electric conductivity of the sintered lithium lanthanum zirconium oxide is more than 2.2*10<-4>S / cm. According to the method, the process is simple, the cost is low, the preparation conditions are easy to control, and the prepared solid electrolyte is good in electrochemical stability and high in electric conductivity and can be used for preparing all-solid-state lithium ion batteries.

The invention discloses an online hydrochloric acid cyclic utilization method on a steel acid pickling line. The method includes the following steps that firstly, acid pickling liquid on the acid pickling line is collected and filtered and is conveyed to a vapor-liquid separator; secondly, oxalic acid is added into the vapor-liquid separator through a chemical adding device; thirdly, mixed liquid is forcefully cycled between the vapor-liquid separator and an acid-resisting and high-temperature-resisting heating evaporation device, acid vapor and a super-saturated solution containing ferrous oxalate crystals are formed, and the acid vapor is conveyed to the acid pickling line; fourthly, a crystallizing tank is used for separating out ferrous oxalate and conveying the ferrous oxalate to a second filtering device; fifthly, the ferrous oxalate crystals are filtered through the second filtering device; and sixthly, the above steps are repeated. According to the online hydrochloric acid cyclic utilization method on the steel acid pickling line, low-concentration hydrochloric acid obtained after acid pickling is converted into high-concentration hydrochloric acid which can be cyclically used through the oxalic acid and is conveyed to the acid pickling line again, meanwhile, due to the reaction of the oxalic acid and ferrous chloride, the ferrous oxalate is generated and can also be used as a raw material of lithium batteries and the like, cost is saved, and profits are generated.

The invention relates to a method for preparing ferrous oxalate by utilizing vanadium slag, and belongs to the technical field of preparing ferrous oxalate for batteries. The technical problem solved by the invention is to provide a method for preparing ferrous oxalate by using vanadium slag. In this method, the quaternary ammonium salt is mixed with oxalic acid to form a deep eutectic solvent; after the vanadium slag is added to the deep eutectic solvent for leaching, solid-liquid separation is obtained to obtain a leaching solution, and deionized water is added to the leaching solution, and the obtained solid is washed, Dry to obtain ferrous oxalate crystals. The method of the present invention uses vanadium slag as a raw material to prepare ferrous oxalate crystals with a relatively high purity particle size of 0.5-2 μm, which have a small particle size, uniform size and high purity, and can be used to synthesize ferrous phosphate, a cathode material for lithium ion batteries. The raw material of lithium has low requirements on equipment, short process flow, and is environmentally friendly. It can realize the comprehensive utilization of valuable metal resources of vanadium slag, and the low eutectic solvent used is environmentally friendly, simple to synthesize, and low in price.

The invention discloses a heterocyclic compound and a preparation method and application thereof. Specifically provide a free base crystal form, hydrochloride salt crystal form, sulfate crystal form, maleate crystal form, phosphate crystal form, fumarate crystal form, Mesylate crystal form, oxalate crystal form and hydrobromide salt crystal form, as well as the preparation method of each crystal form and the application in the preparation of medicine. Wherein each crystal form has excellent physical and chemical properties, so that the crystal form of the compound is particularly suitable for formulation development, especially as a drug for treating cancer, and has a good drug prospect. .