4 results about "Mercury (element)" patented technology

The present disclosure is directed to the use of elemental or speciated iodine and bromine to control total mercury emissions.

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.

The application provides a method for simultaneously determining mercury and other elements in food by using inductively coupled plasma mass spectrometry. When the inductively coupled plasma mass spectrometry is used to determine mercury and other elements, instead of needing to "individually prepare a mercury standard working solution series" as stipulated in the first method of the national standard GB5009.268-2025 "Determination of multiple elements in food", a mercury stabilizing solution (2mL of gold element solution with a concentration of 1000mg / L is diluted to 1000mL by using a nitric acid solution (5+95), i.e., 5% nitric acid-2mg / L gold solution) is used to prepare a mixed standard solution series of other elements, such as lead, cadmium, arsenic and chromium, at the same time when the mercury standard solution series is prepared. The simultaneous determination of mercury and other elements (one-time processing, one-time detection) can be realized, and the content of mercury and other elements can be obtained at the same time, so that the detection efficiency is greatly improved, and the experimental cost is saved.

This invention relates to a method for capturing at least one heavy metal, preferably mercury, present in a hydrocarbon feedstock, the method comprising contacting the feedstock with at least: - a first capturing substance comprising, preferably, at least one of, at least partially in the form of M x S y A metal M existing in the form of a sulfide, M being selected from copper, molybdenum, tungsten, iron, nickel, cobalt, and zinc, preferably copper, iron, and zinc; preferably, M is copper; a second trapping material comprising, preferably consisting of: a porous support based on at least one refractory oxide, and at least one element at least partially composed of M. x S y The metal M exists in the form of a sulfide, and M is selected from copper, molybdenum, tungsten, iron, nickel, cobalt and zinc, preferably copper, molybdenum, nickel, cobalt and zinc; preferably, M is copper.