17 results about "Mercury adsorption" patented technology

The invention discloses a metal sulfide loaded biochar demercuration adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out mechanochemical grinding on a biomass raw material and metal sulfate through a high-energy ball mill to obtain a uniform precursor; and then performing one-step pyrolysis in an inert atmosphere, synchronously carbonizing the biomass and reducing the metal sulfate into metal sulfide, and finally preparing the metal sulfide nanoparticle and charcoal matrix strong coupling composite material. The method is simple in process, green and efficient, and avoids the defects of a traditional liquid phase method. The prepared adsorbent is high in active component dispersity, is firmly combined with a carrier, shows high adsorption capacity, high removal efficiency and good anti-interference stability for elemental mercury in flue gas, and has a wide application prospect in the field of mercury pollution control of coal-fired flue gas.

This invention discloses a method for preparing a magnetic mercury removal adsorbent using waste plastics and waste battery tailings, and its application. The method includes the following steps: S1, premixing treatment: mixing waste battery tailings and waste plastic particles at a mass ratio of 1:0.17-1; S2, pyrolysis reaction: raising the tubular furnace to the target temperature of 500-700℃ and maintaining the temperature for 6 hours; S3, post-treatment. The application is the removal of gaseous mercury from flue gas using the magnetic mercury removal adsorbent. This invention uses waste battery acid extraction tailings and waste plastics as precursors, employing a simple pyrolysis reaction to synthesize a magnetic mercury removal adsorbent. The raw materials are readily available and inexpensive, the preparation method is simple, and it is easy to achieve industrial-scale application. The prepared magnetic mercury removal adsorbent possesses many advantages such as high mercury removal efficiency, strong acid and water resistance, magnetic recovery capability, and high-temperature regeneration capability, providing a new preparation method for magnetic recyclable flue gas mercury removal adsorbents.

The application belongs to the field of pollutant control, and specifically discloses a modified activated coke-based mercury removal adsorbent and a preparation method and application thereof. The preparation method is to heat the activated coke to 300-600 DEG C under a mixed atmosphere of inert gas and SO2 for pyrolysis modification, and to obtain the modified activated coke-based mercury removal adsorbent by cooling after the reaction. The application reduces the SO2 activated coke modification temperature to 300-600 DEG C, can change the mercury removal principle of the prepared mercury removal adsorbent, and makes it suitable for low-temperature mercury removal working conditions. Good mercury removal effect and sulfur resistance can still be achieved at a lower reaction temperature.

The invention relates to the technical field of adsorbent preparation, in particular to a preparation method and application of a sulfur-resistant cheap demercuration adsorbent. The preparation method of the adsorbent comprises the following steps: pyrolyzing the waste tires in an inert gas-containing atmosphere at 550-650 DEG C; the inert gas-containing atmosphere is a pure inert gas atmosphere or an inert gas atmosphere containing SO2 gas. According to the preparation method and application of the sulfur-resistant cheap demercuration adsorbent provided by the invention, the pyrolysis coke adsorbent with a large number of S element active sites is developed by taking waste tire particles as pyrolysis raw materials and researching pyrolysis temperature, gas components and an active coke treatment mode; the pyrolytic coke has the characteristics of good sulfur resistance, high adsorption capacity and low price.

This invention provides a method for preparing, applying, and regenerating a modified porous carbon material mercury adsorbent, belonging to the field of industrial exhaust gas purification. The preparation method involves dissolving an initiator in a solution A rich in acidic oxygen-containing functional groups to obtain solution B; mixing solution B with a monomer solution rich in acidic oxygen-containing functional groups to obtain an impregnation solution; immersing the porous carbon material in the impregnation solution and draining it; heating the obtained porous carbon material to a first temperature and maintaining it for 3-20 hours, then further heating it to a second temperature and maintaining it for 1-6 hours to obtain the final mercury adsorbent. This mercury adsorbent is used to remove Hg from industrial exhaust gas. 0 The removal of mercury is achieved by heating the modified porous carbon material mercury adsorbent after adsorption to 210-260℃ in an inert or oxygen-deficient atmosphere and maintaining the temperature for 0.5-3 hours at a heating rate of 0.5-5℃ / min. The mercury adsorbent of this invention exhibits significantly improved mercury capture efficiency, with a mercury capture capacity increased by more than 25 times.

This invention belongs to the technical field of solid waste resource utilization. It discloses a method for preparing a mercury removal adsorbent from brominated flame-retardant waste plastics and the mercury removal adsorbent itself. The method includes: pulverizing and drying the brominated flame-retardant waste plastics to obtain reaction raw materials; placing the reaction raw materials in a pyrolysis reactor and pyrolyzing them under an inert atmosphere to obtain solid residue; placing the solid residue in a low-temperature plasma reactor and modifying it through discharge between two electrodes; and pulverizing and grinding the modified solid residue to obtain the mercury removal adsorbent. This invention uses brominated flame-retardant waste plastics as raw materials and prepares a mercury removal adsorbent through low-temperature plasma modification. The raw material is electronic waste, which is generated in large quantities, has low cost, and is simple to prepare and modify. It can solve two problems: mercury removal from flue gas in coal-fired power plants and resource recycling of electronic waste. The use of pyrolysis reaction and low-temperature plasma modification significantly improves the mercury removal efficiency.

The application discloses a kind of selective removal of divalent mercury in smelting waste acid The preparation method of magnetic adsorbent belongs to the technical field of divalent mercury removal in smelting waste acid.The adsorbent described in the application is formed by loading copper sulfide (CuS) on Fe-Ti spinel by passing hydrogen sulfide gas into the mixed solution of Fe-Ti spinel (Fe-Ti spinel) and copper sulfate, and then calcining under nitrogen protection. The application significantly improves the ability of CuS / Fe-Ti spinel to remove divalent mercury by means of calcining under nitrogen protection. At the same time, the adsorbent has excellent selectivity for the removal of divalent mercury. In addition, the adsorbent has superparamagnetism and can be easily separated from smelting waste acid by an external magnetic field, making it easy to safely dispose of the mercury-containing adsorbent.

The invention provides a method for removing mercury through medical waste incineration, a mercury removal adsorbent and application. The method for removing mercury through medical waste incineration comprises the following steps that after a mercury removal adsorbent solution is sprayed to the surface of medical waste, incineration is conducted; the demercuration adsorbent disclosed by the invention comprises CaCl2, CaBr2 and KI which are compounded, so that the removal of Hg < 0 > in flue gas is greatly improved; the mercury removal adsorbent also contains MgO, the MgO is used as an alkaline neutralizer, and acidic gases such as HCl, HBr and HI generated by incineration are neutralized to create a more stable reaction environment for halogen free radicals, so that the potential inhibition on HgO oxidation chain reaction is reduced, and the oxidation rate is further improved; meanwhile, the concentration of dioxin in the flue gas can be reduced due to the existence of MgO; mgO is used as an alkaline neutralizer and can react with hydrogen halide to generate corresponding salt, so that the effect of reducing acid dew point corrosion is achieved, and the corrosion of flue gas to equipment is further reduced.

The invention discloses a mechanism-data driven mercury adsorbent design and wet elution optimization method, which comprises the following steps of: firstly, analyzing adsorption characteristics of mercury and hydrogen sulfide on transition metal oxide and element reaction kinetic parameters of mercury species in a solution through density functional theory calculation and thermodynamic calculation; then extracting characteristic values influencing adsorption and elution performance, and carrying out data preprocessing; a machine learning method is used for screening out key characteristic values leading the adsorption performance of mercury and hydrogen sulfide, and transition metal oxides with the maximum adsorption performance of mercury and the lowest desorption energy of hydrogen sulfide are predicted; meanwhile, the characteristic value of the elution performance of the mercury species in the solution is screened out, and the elution solution with the optimal elution effect of the mercury species is predicted; and finally, based on a prediction result, synthesizing a high-performance transition metal oxide suitable for removing mercury in the synthesis gas flue gas, and realizing efficient desorption of mercury species and regeneration of an adsorbent through a matched eluent. The research and development efficiency and the wet elution effect of the mercury adsorbent are improved.

The application provides a mercury adsorbent, a preparation method and application. The mercury adsorbent is a mesoporous material, and the mercury adsorbent comprises cobalt sulfide and biomass charcoal. The cobalt sulfide is loaded on the biomass charcoal, the cobalt sulfide is CoS2, and the mass percentage of the cobalt sulfide is 10-70%. The mercury adsorbent has the following advantages: the cobalt sulfide is uniformly dispersed, the mesoporous pore size of the mercury adsorbent is larger than the micropore size, the diffusion of mercury Hg is promoted, the mercury Hg is fully contacted with the cobalt sulfide, and the mercury Hg is adsorbed by the cobalt sulfide, so that the mercury adsorption capacity of the mercury adsorbent is improved. The mercury adsorbent has a high mercury adsorption capacity, and can effectively adsorb mercury.

The application discloses a method for preparing an adsorbent by using landfill leachate and red mud, and comprises the following steps: (1) mixing the landfill leachate and the red mud uniformly to obtain organic mixed red mud, and then performing roasting treatment on the organic mixed red mud to obtain roasting mud; (2) mixing fly ash and the roasting mud uniformly, and then performing grinding to obtain roasting mixed powder mud; (3) mixing the landfill leachate and the roasting mixed powder mud uniformly, performing granulation, and then standing to obtain raw material particles; and (4) performing hydrothermal reaction on the raw material particles, wherein the hydrothermal liquid is the landfill leachate, after the hydrothermal reaction is completed, solid-liquid separation is performed, the particles after the hydrothermal reaction are dried, and the adsorbent is obtained. The application realizes the resource utilization of industrial waste, and the treatment process is simple; by coupling the roasting and the hydrothermal reaction of the mixed landfill leachate and the red mud, the adsorbent with high adsorption performance is prepared, and the highest mercury adsorption capacity and the highest cadmium adsorption capacity can reach 237 mg / g and 188 mg / g respectively.

The invention provides a method and a system for regenerating an inactivated mercury removal adsorbent through light-heat coupling strong jet flow. The system mainly comprises an opposite-phase impact regeneration device, a high-speed nozzle arranged in the opposite-phase impact regeneration device, an ultraviolet lamp tube, a material mixing preheating tower, a stirrer, a flue gas waste heat exchanger, a liquid-solid separator and a flue gas-air heat drying and activating system. High-activity free radicals are induced by utilizing ultraviolet light-flue gas waste heat and a counter-impact flow coupling activation regeneration reagent in an opposite-phase counter-impact regeneration device, and the high-activity free radicals can generate a violent chemical reaction with harmful substances covering surface sites of an inactivated adsorbent; and the high-speed jet flow generated by the counter-impact flow can impact covering substances on the surface and in gaps of the adsorbent, so that the deactivated mercury removal adsorbent is regenerated synergistically from two aspects of chemistry and physics. The device disclosed by the invention has the comprehensive advantages of simple structure, high regeneration efficiency, high mass transfer and diffusion efficiency, energy conservation, low carbon, green and environment-friendly operation process and the like, and has good industrial application value.

Provided is an activated carbon for adsorbing mercury that can adsorb mercury more efficiently without utilizing the properties of inorganic compounds such as halogen or sulfur compounds that are suitable for adsorbing mercury. The activated carbon for mercury adsorption in petroleum refining has a BET specific surface area of ​​1200 m2 calculated by the BET method from the nitrogen adsorption isotherm. 2 / g or less, the average pore diameter calculated by the following formula (i) using the pore volume calculated from the nitrogen adsorption isotherm by the BET method is 1.75 nm or less, and the pore volume of pores with a diameter of 0.6 nm or less calculated from the nitrogen adsorption isotherm by the MP method is 0.14 cm 3 / g or more, and the pore size distribution calculated by the MP method from the nitrogen adsorption isotherm (vertical axis: log differential pore volume dV / dlogD (cm 3 / g), horizontal axis: pore diameter D (nm), the maximum peak position of the pore diameter is in the range of 0.5 to 0.7 nm.

This invention provides a mercury adsorbent regeneration process and its application. The process includes: calcining a mercury-loaded adsorbent to remove mercury and condensing and recovering elemental mercury, obtaining mercury-removed slag; then subjecting the slag to sulfidation to obtain the regenerated adsorbent. The mercury adsorbent is prepared from a precursor with a molybdenum-sulfur molar ratio of 1:0.1-1:40. This regeneration process achieves highly efficient adsorbent regeneration, maintaining an adsorption capacity of no less than 3600 mg / g after multiple cycles, while simultaneously recovering mercury resources. It solves the problem of traditional wet regeneration methods that easily damage active sites and is suitable for treating mercury-containing wastewater.

The invention provides lactobacillus reuteri MRL1103 and application thereof, and relates to the technical field of microorganisms and mercury adsorption, the preservation number of the lactobacillus reuteri MRL1103 with a mercury adsorption function is CGMCC NO.28840, the lactobacillus reuteri MRL1103 is separated from fresh chicken manure, the lactobacillus reuteri MRL1103 can tolerate a mercury solution with the concentration as high as 100 mg / L, and under the conditions that the pH is 5 and the concentration of the mercury solution is 5 mg / L, the concentration of the mercury solution can reach 100 mg / L, and the concentration of the mercury solution can reach 100 mg / L; the adsorption rate of the lactobacillus reuteri MRL1103 on mercury in a mercury solution reaches 95% or above, and the lactobacillus reuteri MRL1103 has an inhibition effect on escherichia coli, staphylococcus aureus, salmonella enteritidis, salmonella pullorum or salmonella typhimurium. The lactobacillus reuteri MRL1103 can be used for removing a mercury metal element in a matrix, and the matrix can be mercury-containing soil, a feed or a culture medium.

The application provides copper-doped iron sulfide and a preparation method and application thereof, wherein the preparation method of the copper-doped iron sulfide comprises the following steps: S1. configuring iron nitrate and copper nitrate into a metal salt solution; wherein the sum of the molar concentrations of iron ions and copper ions in the metal salt solution is 0.003-0.06 mol / 25 ml; S2. dissolving a sulfur source in the metal salt solution to obtain a mixed solution, heating the mixed solution to 120-180 DEG C under high pressure for 12 h, and separating the solid substance in the mixed solution to obtain the copper-doped iron sulfide; the molar concentration of the sulfur source in the mixed solution is 0.01-0.1 mol / 50 ml; or, the metal salt solution is heated to 120-180 DEG C under high pressure for 12 h to obtain a precursor, the precursor is mixed with elemental sulfur and then heated to 400 DEG C for 2 h to obtain the copper-doped iron sulfide. The mercury adsorption capacity of the iron sulfide is improved, and the Hg 0 removal has a significant economic advantage.