4 results about "Sodium antimonate" patented technology

This invention relates to a method for preparing high-purity sodium pyroantimonate from antimony-containing waste, belonging to the field of sodium pyroantimonate preparation technology. Specifically, the method includes: crushing and ball milling the antimony-containing waste, followed by sulfidation-alkali leaching in the presence of modified inorganic mineral additives. Antimony enters the solution as Na3[SbS3], while lead, copper, and iron precipitate as sulfides in the slag phase. The additives improve the settling and filtration performance of the leaching slag and assist in the adsorption of colloidal arsenic. After deep purification of the leachate with sodium sulfide, the mother liquor is cooled and crystallized to remove arsenic, which is separated as sodium arsenite crystals. The purified liquid undergoes air oxidation precipitation under seed crystal induction, followed by liquid-solid separation, washing, and drying to obtain high-purity sodium pyroantimonate product. This invention meets the quality requirements of electronic-grade glass clarifying agents, and features strong process compatibility, controllable additive costs, and recyclable mother liquor.

The present application relates to the field of nonferrous metallurgy, and provides a method for preparing high-quality sodium pyroantimonate by pre-oxidation and double decomposition, comprising the following steps: under the assistance of ultrasonic waves, adding antimony oxide and hydrogen peroxide into a dilute nitric acid solution at 50-80 DEG C to react, carrying out liquid-solid separation, washing, and drying to obtain a powdered antimony pentoxide product; slurryzing the antimony pentoxide product with a potassium hydroxide solution, then adding the obtained slurry into a high-pressure reaction kettle, stirring and reacting under high temperature and high pressure, carrying out liquid-solid separation after cooling to obtain a potassium pyroantimonate solution; adding sodium hydroxide into the potassium pyroantimonate solution after heating to 70-90 DEG C, carrying out a double decomposition reaction, carrying out liquid-solid separation, and drying to obtain a sodium pyroantimonate product. The essence of the present application is to achieve the purpose of deeply removing impurities through the two processes of acidic oxidation and pressure dissolution, and to prepare a high-quality sodium pyroantimonate product by using a double decomposition reaction. The present application has the advantages of good quality of the sodium pyroantimonate product, good filtration performance, and stable technical indexes.

This application relates to an electrolytic preparation method for low-arsenic antimony in an alkaline system, belonging to the field of hydrometallurgical technology. The method includes: separating the anode and cathode chambers using an anion exchange membrane; injecting sodium thiostite solution into the cathode chamber and sodium hydroxide solution into the anode chamber; using a stainless steel plate or mesh as the anode and a stainless steel plate as the cathode, and connecting it to a power source after pretreatment; performing pre-electrolysis to preferentially co-deposit impurities such as arsenic, which have similar electrode potentials to antimony, on the cathode to obtain a purified electrolyte; replacing the cathode plate after a period of settling, and then performing formal electrolysis to obtain a low-arsenic cathode antimony product. This application achieves deep removal of impurities such as arsenic through the synergistic effect of pre-electrolysis and the anion exchange membrane, avoiding the burial and contamination of impurities in the cathode antimony, while improving the deposition morphology of the cathode antimony, resulting in a high-quality cathode antimony product with a dense and smooth surface, extremely low arsenic content, and low levels of impurities such as copper, lead, and bismuth.

This invention relates to the fields of inorganic chemical engineering and textile auxiliaries, and discloses a surface modification process for textile-grade sodium metaantimonate to improve dispersibility. The process includes: adding sodium aluminate to a sodium metaantimonate suspension and stirring until dissolved to create an alkaline liquid environment in which tetrahydroxyaluminate ions are stably present; adding an aqueous solution of phenylphosphonic acid dropwise to this alkaline system for acid-base neutralization, controlling the hydrolysis of aluminum species using the acid release rate, and inducing in-situ generated aluminum hydroxyl species to coordinate with phenylphosphonate ions. This invention constructs an antimony-oxygen-aluminum-oxygen-phosphorus chemical hybrid coating layer without a phase interface on the surface of sodium metaantimonate through a specific acid-base coupling synchronous mineralization mechanism. This kinetically blocks the self-condensation aging path of aluminum species, improves the interfacial bonding force and thermal stability of the modified layer under high temperature and high shear conditions, and effectively solves the problems of thermal desorption and secondary agglomeration of sodium metaantimonate during melt spinning.