9 results about "Metallic mercury" patented technology

The invention relates to the technical field of resource recovery of waste mercury catalysts, and particularly discloses a method and a device for recovering mercury from a waste mercuric chloride catalyst based on ultrasonic-assisted acidic thiourea leaching. The method comprises the following steps: crushing the waste catalyst, mixing the crushed waste catalyst with an acidic thiourea leaching agent with a specific concentration in proportion, and leaching under a specific ultrasonic condition to enable mercury to form a soluble complex to enter a solution; separating the leachate through a microporous membrane, and reducing the filtrate through zinc powder to obtain mercury precipitate; and finally, centrifuging, washing and drying to obtain high-purity metal mercury. The device system integrates equipment such as a catalyst crusher, an ultrasonic leacher, a microporous membrane separator, a reaction kettle and a centrifugal machine. According to the method, efficient recovery of mercury is achieved through a mild wet process, the leaching rate reaches 90% or above, the purity of the reduced mercury product is larger than or equal to 99.5%, and the method has the advantages of being low in energy consumption, small in pollution and stable and reliable in process.

The present application relates to mercury pollution treatment technical field, especially laboratory mercury pollution automatic processing method, the method includes the following steps: step S1: the mercury waste gas is from the air inlet pipe into the pretreatment pool, so that the mercury waste gas is contacted with the absorption liquid to absorb the mercury waste gas; Step S2: when the absorption liquid changes color, the first color sensor sends a signal to the control host, the control host controls the multiple electric telescopic rod to drive the shielding block to move, so that the air outlet pipe is opened, the control host controls the first valve to open, so that the absorption liquid is contacted with the filter material through the liquid outlet pipe into the filter tank to reduce mercury ions to metallic mercury; The present application can accurately and efficiently treat mercury vapor, mercury waste liquid and find mercury leakage in time, so as to guarantee the personal safety of the experimenter.

The invention belongs to the technical field of metallurgical engineering, and mainly relates to a method for extracting mercury from mercuric sulfide by a wet process based on composite leaching and modified resin adsorption. The method comprises the following steps: adding dilute sulphuric acid into mercuric sulfide concentrate, stirring for reaction, and filtering to obtain impurity-removed mercuric sulfide; mixing the impurity-removed mercuric sulfide with a composite leaching solution, stirring and leaching to obtain a mercury-containing complexing solution; the composite leachate is a mixed solution of a complexing agent and ferric sulfate; and adsorbing the mercury-containing complexing solution through modified thiourea type chelating resin, desorbing to obtain a mercury-containing desorption solution, and carrying out electrolytic deposition on the mercury-containing desorption solution to obtain metal mercury. The method realizes reselection of mercuric sulfide, efficient extraction of flotation concentrate, resource circulation of wastewater and harmless utilization of solid waste, has remarkable advantages in leaching efficiency, environmental protection property and raw material adaptability, and shows a wide industrial application prospect.

The invention discloses a fluorescent probe for detecting metal mercury ions and a preparation method and application thereof, the molecular formula of the probe is C21H20O5N2S, and the structural formula is shown in the specification. The invention designs a fluorescent probe for detecting metal mercury ions (Hg < 2 + >) aiming at environmental Hg < 2 + > monitoring requirements. The probe can rapidly react with Hg < 2 + > (response time is 1t, 10 s), and has nanomole-level detection sensitivity (detection limit is 1.0 nM) and excellent anti-interference capability. The method is applied to detection of mercury ions (Hg < 2 + >) in real water samples, crop soil, plant root systems and in-vitro living cells. And a novel tool is provided for providing intermediate information for pathological research of Hg < 2 + > related diseases and evaluating environmental toxicity.

The present invention discloses a nanocomposite material, a preparation method and its application in the colorimetric detection of metallic mercury ions, which belongs to the field of preparation and application of nanocomposite materials. The present invention prepares N, S co-doped carbon / Co6Ni3S8 (NSC / Co6Ni3S8) nanocomposite material by sol-gel method to study the catalytic performance. Through nitrogen adsorption and desorption experiments and Raman spectroscopy tests, it was found that NSC / Co6Ni3S8 has a large specific surface area and an amorphous carbon structure that is conducive to catalysis. After enzyme-like experimental evaluation, it was verified that NSC / Co6Ni3S8 has oxidase-like activity. After method evaluation experiments and other metal ion interference experiments, it was concluded that the colorimetric detection method based on the color development of substrates catalyzed by NSC / Co6Ni3S8 nanoenzymes showed excellent specificity, a linear range of 10-100μg / L, and a detection limit as low as 3μg / L, which meets the detection limit required for actual monitoring and has good practical application value. Combined with the smart APP, a real-time colorimetric detection method for Hg in river water was successfully constructed. 2+ platform.

The invention relates to the technical field of cholesterol preparation, and discloses a bilirubin mercury removal method which comprises the following steps: 1) preparing a bilirubin calcium salt or a bilirubin crude product into a sodium bilirubin aqueous solution; 2) adding activated carbon into the sodium bilirubin aqueous solution for primary adsorption, and performing solid-liquid separation to obtain a primary purified solution and primary adsorption activated carbon; 3) diluting the primary purified solution with water, adding activated carbon for secondary adsorption, and performing solid-liquid separation to obtain a secondary purified solution; 4, hydrochloric acid is added into the secondary purified solution for acidification, then chloroform is used for extraction, reduced pressure distillation is carried out for solvent separation, and then bilirubin is obtained.By means of the method, metal mercury in bilirubin can be effectively removed, the mercury content is controlled not to exceed 0.2 mg / Kg, and meanwhile the yield of bilirubin is guaranteed.

The invention provides a method for recovering lead, selenium and mercury in nonferrous smelting acid mud, which belongs to the technical field of comprehensive utilization of resources and comprises the following steps of: leaching the nonferrous smelting acid mud by using a sodium chloride solution, and filtering to obtain lead-containing liquid and lead-removed slag; adding a lead precipitating agent into the lead-containing liquid to react, and filtering to obtain lead hydroxide and lead-precipitated liquid; hydrochloric acid and an oxidizing agent are added into the deleading slag for leaching, and then filtering is conducted to obtain oxidation leaching liquid; adding a reducing agent into the oxidation leachate for reaction, and filtering to obtain reducing slag; adding a leaching agent into the reducing slag for leaching, and filtering to obtain leaching slag and leaching liquid; adding sulfuric acid into the leachate to acidify and reduce, and filtering to obtain crude selenium and acidified liquid; adding lime and sodium hydroxide into the leaching residues, and carrying out pyrogenic distillation to obtain metal mercury and distillation residues; adding sulfuric acid and an oxidizing agent into the distillation residues, leaching, and filtering to obtain leached liquid; and adding a reducing agent into the leached liquid for reduction, and filtering to obtain crude selenium. The method for recycling lead, selenium and mercury in nonferrous smelting acid mud is easy to operate, economical, environmentally friendly and capable of achieving efficient recycling of lead, selenium and mercury.

The invention belongs to the field of metallurgy, and particularly relates to a method for recovering selenium and mercury from a lead filter cake, which comprises the following steps: (1) leaching; (2) selenium reduction; (3) neutralizing; and (4) mercury precipitation. Hg in the lead filter cake is mainly Hg (metallic mercury), HgS (cinnabar), HgSe (mercury selenide) and HgCl (mercuric chloride), and Se is mainly Se (elemental selenium), SeO (selenium dioxide), PbSe (lead selenide) and CuSe (copper selenide), the scheme comprises the following steps: extracting selenium and mercury in the lead filter cake by adopting a leaching system consisting of hydrochloric acid and hydrogen peroxide, oxidizing and dissolving out selenium and mercury in the lead filter cake by utilizing the strong oxidizing property of Cl2 generated by hydrogen peroxide and HCl, and separating the selenium and mercury from the lead filter cake. And the leaching rates of selenium and mercury are greatly improved.

This invention belongs to the field of isotope separation technology, specifically disclosing a method for lithium isotope separation. Addressing the significant risks to the ecological environment and occupational health posed by existing lithium amalgam methods due to the use of large quantities of highly toxic metallic mercury, and the limitation of insufficient mercury availability hindering large-scale production to meet the increasing demand for lithium isotope products, this invention proposes a safe, efficient, and industrially viable non-mercury-based lithium isotope separation method. This method is a liquid-liquid extraction method based on isotope exchange reactions between molten salt and liquid metal. The basic principle utilizes two stable isotopes of lithium. 6 Li and 7 The difference in the partition coefficient of Li between the liquid metal phase and the molten salt phase. The single-stage separation coefficient α of this method can meet the requirements of the single-stage separation factor for the industrialization of chemical exchange method (α≥1.02), and can be realized by laboratory heating furnace or scaled up by high-temperature extraction tower, providing a new technical route for lithium isotope separation.