3 results about "Calcium arsenite" patented technology

This invention discloses a method and apparatus for preparing high-purity arsenic in an anhydrous liquid medium at high temperatures, belonging to the field of molten salt electrochemistry. The method uses a low-melting-point, highly stable calcium chloride (CaCl2)-based molten salt as the electrolyte, directly dissolving or dispersing calcium arsenate powder in the molten salt. Electrolysis is carried out under an inert atmosphere, with the electrolysis temperature controlled between 650-950℃. Arsenate ions (AsO4) are present at the cathode. 3‑ The arsenic is directly reduced to elemental arsenic. Because the operating temperature is much higher than the boiling point of arsenic (614℃), the elemental arsenic instantly vaporizes into arsenic vapor (As₄(g)) and escapes from the molten salt. The arsenic vapor is transported to a condensation system via a carrier gas, where it condenses into solid high-purity arsenic in a low-temperature zone of 200-300℃ for collection. Oxygen is released from the anode through an oxygen ion oxidation reaction. This invention achieves the direct conversion of stable arsenate into high-value-added, high-purity arsenic. The process is short, energy-efficient, and produces high-purity products, providing a novel pathway for the high-value utilization of arsenic-containing waste.

The application discloses an antitumor composition of arsenic trioxide and artesunate for enhancing the drug efficacy of arsenic trioxide, and discloses GA modified pH responsive arsenic trioxide-artesunate double-drug nanoliposome including the composition, the double-drug nanoliposome including glycyrrhetinic acid-polyethylene glycol-hydrazone-distearyphosphatidyl ethanolamine polymer, cholesterol, artesunate and calcium arsenate nanoparticles; the glycyrrhetinic acid-polyethylene glycol-hydrazone-distearyphosphatidyl ethanolamine and cholesterol form nanoliposome, and the nanoliposome is loaded with artesunate and calcium arsenate nanoparticles; the calcium arsenate nanoparticles contain arsenic trioxide, and a preparation method and application in preparing antitumor drugs are disclosed. The application first co-loads the highly toxic traditional Chinese medicine arsenic trioxide and artesunate to play a synergistic effect, realizes the attenuation and efficiency enhancement of arsenic trioxide through targeted modification delivery and tumor microenvironment response release, and has a good clinical application prospect.

The application belongs to the field of arsenic pollution treatment, and more particularly relates to a method for enhanced treatment of acidic arsenic-containing wastewater. The application provides a method for carbonate mineral enhanced crystallization treatment of acidic arsenic-containing wastewater, which is based on the structural compatibility between carbonate minerals and calcium arsenite minerals, and uses the interface effect of carbonate minerals to induce the epitaxial crystallization of calcium arsenite minerals into minerals. Compared with the technical method without carbonate mineral induction, the Ca-As(III) product obtained by the technical solution has better crystallinity, larger crystal size and lower solubility, so that the removal of As(III) in the wastewater can be enhanced.