5 results about "Thiosulfuric acid" patented technology

This application provides a gold leaching reagent system and its heap leaching process for treating low-grade gold ore, belonging to the field of hydrometallurgy. The gold leaching reagent system includes a main leaching agent, a catalytic leaching agent, and a stabilizer; wherein the main leaching agent is glycine, the catalytic leaching agent is anhydrous sodium thiosulfate, and the stabilizer is an organic ammonium salt. This application constructs a ternary stable and synergistic system of sodium thiosulfate-glycine-organic ammonium salt by introducing an organic ammonium salt with a specific structure. This optimizes the traditional thiosulfate gold leaching process from both thermodynamic and kinetic perspectives. The organic ammonium salt cations can dynamically adsorb around the thiosulfate ions in solution through intermolecular interactions, forming an effective shielding layer. This significantly inhibits the side reaction of sodium thiosulfate being oxidized and decomposed into sulfate and other ineffective products by dissolved oxygen, maintaining the long-term stability of the effective components in the leachate. This gold leaching reagent system has comprehensive advantages such as high leaching efficiency, good reagent stability, environmental friendliness, and low operating costs.

The application provides an extreme acidophilic sulfur-oxidizing bacterium and application thereof. The extreme acidophilic bacterium has strong oxidation on elemental sulfur and tetrathionate ions, is a chemolithoautotrophic acidithiobacillus, and can be used for removing elemental sulfur and tetrathionate ions in the environment, and has wide application prospects. The acidophilic sulfur-oxidizing bacterium has a preservation number of CGMCC No. 14839. The optimal growth temperature of the biological leaching and desulfurization provided by the application is normal temperature, and the optimal growth pH range is wide, so that the strain of the application has practical application significance. In addition, due to the characteristics of chemolithoautotrophy, the strain can improve the climate environment while recovering the environment.

The present invention is a sulfur compound measurement method for diagnosing a disease, the method comprising a measurement step for using a mass spectrometer to analyze a sample obtained from the exhaled breath of a subject, and measuring the amounts of a plurality of types of sulfur compounds contained in the sample, the measurements being used for diagnosing whether the subject is suffering from a prescribed disease. The plurality of types of sulfur compounds include two or more types of sulfur compounds selected from among ten types of sulfur compounds, namely hydrogen sulfide, hydrogen disulfide, hydrogen trisulfide, hydrogen tetrasulfide, cysteine, cysteine persulfide, glutathione, glutathione persulfide, sulfurous acid, and thiosulfuric acid.

This application discloses a method for catalytic wet oxidation treatment of sodium thiosulfate. The method includes: contacting a raw material containing sodium thiosulfate with a catalyst and an oxidant to undergo an oxidation reaction to obtain sodium sulfate; wherein the catalyst includes a support and an active component; the support is activated carbon; the active component includes a transition metal active element; the transition metal active element is selected from one to three of Mn, Fe, Co, Ni, and Cu. This method can achieve oxidation of more than 60% of 10000 mg / L thiosulfate, and the catalyst activity can be restored by water washing and regeneration after a decrease. The catalyst morphology remains good after 30 days of continuous operation.

The application discloses a method for selectively recovering gold from gold leaching solution by copper-ammonia catalytic thiosulfate method and simultaneously removing impurities from the solution, which comprises the following steps: performing constant potential electrodeposition on the gold leaching solution obtained by leaching gold-containing raw materials by the copper-ammonia catalytic thiosulfate method, and controlling the potential of the working electrode to be in the range of-0.5V to-0.4V relative to the mercury / mercury oxide electrode and the pH to be in the range of 9.5 to 10.5. In the potential and pH range, gold ions are preferentially reduced to elemental gold and deposited on the cathode, while copper ions are not deposited, realizing high selective separation and recovery of gold. More importantly, thiosulfate will not be oxidized, and the impurity sulfur oxyanions generated by the oxidation of thiosulfate during the leaching process will be converted into thiosulfate, realizing the removal of impurities from the leaching solution and the regeneration of the gold leaching agent. The process flow is short, the operation is simple, and the environment is friendly.