185 results about "Mercury pollution" patented technology

The invention discloses a method for preparing chloroethylene by catalytic reforming, which relates to a method for preparing the chloroethylene. The method comprises: a step of preparing a catalyst by using active carbon as a carrier, in which a barium salt is used as a catalyst, the active carbon is used as the catalyst carrier, and the barium salt is dissolved in water, absorbed by the active carbon and dried to obtain the catalyst carried by the active carbon; and a step of synthesizing the chloroethylene, in which acetylene gas and dichloroethane vapour are mixed and introduced to a reactor containing the catalyst carried by the active carbon to react, the reaction effluent is cooled to room temperature, unreacted dichloroethane is condensed to be separated out, and the remaining gas is compressed and frozen to give liquid chloroethylene. In the invention, a mercury free catalyst is adopted, the mercury pollution of the chloroethylene production industry is eliminated, and the reaction is performed spontaneously with little energy consumption.

The invention discloses a method for quickly detecting lead and cadmium by adopting scanning anodic stripping voltammetry. The method comprises the following steps: a sample to be tested is prepared; lead or cadmium standard liquid is prepared; a three-electrode system consisting of glassy carbon electrodes plated with mercury films, platinum wire counter electrodes and Ag/AgCl reference electrodes is assembled; parameters are set and the scanning anodic stripping voltammetry is adopted to respectively implement parallel determination for current values between working electrodes and reference electrodes of each standard liquid solution until the relative standard deviation of readings is not more than 5%; lead and cadmium heavy metals of the sample are measured through detecting the current values between the working electrodes and the reference electrodes; a working station automatically calculates to obtain detecting results through automatically searching peaks to determine each curve peak area. The detecting method has the advantages of high sensitivity, good accuracy, reduction of mercury pollution, high electrode stability and good reproducibility, and can be applied to the detection of the heavy metals of lead and cadmium with conventional trace and ultratrace.

The invention discloses a repairing method and device for mercury-polluted soil by using low-temperature pyrolysis treatment. The repairing method for the mercury-polluted soil comprises the following steps: crashing excavated mercury-polluted soil and drying the excavated mercury-polluted soil with air, wherein the soil moisture content is less than or equal to 10%; and secondly, putting the soil dried with the air into a pyrolysis device, wherein the original temperature of the pyrolysis device is 250 DEG C, heating within 30 minutes to be at a temperature within 400 DEG C, and condensing and recycling mercury steam evaporated in the soil through a gas recycling device. The invention provides the method and the device for properly repairing and recycling mercury. The method for repairing the mercury-polluted soil by using a low-temperature pyrolysis treatment repairing technology and separating pollutants from the soil by using a physical heating method is adopted, so that not only can the soil cultivation capability be kept, but also can realize the purpose of absolutely removing the mercury from the polluted soil. Clean soil and organic matters can be properly added in the treated soil, so that the agriculture production can be rapidly repaired, and the operation cost is low.

A method and apparatus for reducing discharges into the atmosphere of mercury pollutants associated with dry process, precalciner cement manufacturing is shown. Raw feed meal used in cement production is heated in a special heating chamber to drive off volatile mercury pollutants, such as elemental mercury and mercury oxides. Preferably, the feed meal is heated to a temperature of at least 175° C. The gases that are driven off flow are then cooled to condense the mercury pollutants causing them to be adsorbed on carbon particles injected into the gas flow. The carbon particles containing the condensed mercury pollutants are then filtered out of gas flow, for example, using a fabric filter. The gas flow may be burned to destroy other volatile pollutants such as hydrocarbons and/or ammonia.

The invention relates to a dimming method applicable to traditional dimmers and an LED dimmable drive power. The method comprises the following steps: converting PWM signals determined by the phase ofthe angle of flow into DC signals through a phase test circuit after being filtered by a RC circuit, and magnifying the signals to control the changes of the resistance value of a constant-current sampling resistor so as to regulate the magnitude of the LED current. The invention can regulate the brightness of an LED bulb by the traditional dimmer, so that people can conveniently change the traditional incandescent bulb lamp into the LED bulb lamp with the ideal stepless dimming function. The LED has the characteristics of long service life, no mercury pollution or ultraviolet pollution, highlight efficiency, shock resistance, energy saving and the like, and belongs to a new generation of green light sources. Therefore, the invention has the advantages of favorable dimming effect (1-100%of continuous stepless dimming), soft light color, environmental protection and energy saving.

The invention discloses the technical field of flue gas demercuration method, and in particular to a mercury re-releasing inhibitor in wet flue gas desulfurization slurry and application method thereof. The inhibitor disclosed by the invention comprises the following components by weight percent: 25 to 45 percent of thiosulfate and 55 to 75 percent of sodium sulfide. The additive is added into the desulfurization slurry to inhibit the release of mercury; the adding amount of the additive is 100ml/L to 600mg/L. The inhibitor can react with Hg<2+> in the slurry well by utilizing the synergistic effect of thiosulfate and sodium sulfide to form stable HgS sediment; the sediment and desulfurization gypsum enter a solid phase together and are separated and removed. Meanwhile, the inhibitor disclosed by the invention is suitable for being added under the operating conditions of a wet desulfurization system, so that the waste of the additive is reduced. By the inhibitor, the re-release of the mercury in the limestone-gypsum wet flue gas desulfurization slurry can be inhibited effectively, the demercuration efficiency of a limestone-gypsum wet flue gas desulfurization system can be improved, and the problem of mercury pollution caused by coal-fired flue gas emissions can be solved effectively.

The invention discloses a method of testing porosity of a pole piece. The method comprises that a certain pole piece is cut and taken, the mass M0 of the pole piece is weighed, the size V of the pole piece is measured, the pole piece is placed in a container, cetane is arranged in the container, the pole piece is completely soaked in the cetane for a certain time, the pole piece is taken out and placed on a filter paper, the pole piece is absorbed and wiped to constant weight, the mass M1 of the pole piece is weighed, and the porosity epsilon of the pole piece is calculated according to a formula epsilon=(M1-M0)/rho/V*100%. The method of testing the porosity of the pole piece needs not the complex and difficult operating process of mercury injection apparatus, and reduces measuring cost, in addition, mercury pollution and potential hazard on operation staff are reduced, meanwhile the processing work on waste mercury is reduced, and testing efficiency is improved.

The present invention belongs to the field of environment tackling with microbes. The strain is pseudomonasputida CHY-7 separated from mercury contaminated soil and preserved in Chinese typical culture preserving center. Pseudomonasputida CHY-7 is suitable for culture in neutral, weak acid or weak alkaline culture medium at normal temperature, and may grow in water or soil. Pseudomonasputida CHY-7 is aerobic Gram-negativre bacterium and has size of (2.0-4.0)x(0.7-1.1) micron and no spore generated. It forms yellowish colony with smooth raised edge and can generate fluorescence in chromogenesis culture medium. It has high effect of reducing ionic mercury into volatile mercury element and may be applied widely in tackling mercury contaminated environment.

The invention discloses a method and system for efficiently controlling mercury pollution of a coal-fired power plant at low cost. The system comprises a primary hot air duct, a secondary hot air duct and a liquid storing tank, wherein the primary hot air duct and the secondary hot air duct are communicated with an air preheater and a hearth; a coal conveying system is communicated with a coal grinding system through a coal feeder; the liquid storing tank is filled with a halide additive solution; and the liquid storing tank is communicated with at least one of the coal conveying system, the coal feeder, the primary hot air duct and the secondary hot air duct. According to the system, the halide additive solution enters a boiler body and participates in a combustion reaction, the oxidation of the mercury in flue gas is promoted and the ratio of mercury oxide in the flue gas is increased, so that the synergetic demercuration effect of flue gas purifying equipment such as denitration equipment, desulfurization equipment, dedusting equipment and the like in a tail flue of a boiler is improved, and the mercury content of flue gas in a chimney is greatly lowered. A mercury pollutant control system has the advantages of small investment and low running cost while the mercury pollutant emission level of the coal-fired power plant can meet stricter environmental standard requirements.

The invention discloses a high-stability composite mercury catalyst for hydrochlorination of acetylene. The catalyst comprises the following components: 100 parts of active carbon serving as a carrier, 1-15 parts of mercuric chloride serving as a main catalytic component and 1-10 parts of auxiliary component, wherein the auxiliary component is one of chlorides of cobalt, manganese and gadolinium or a mixture of multiple of the chlorides, or one of chlorides of bismuth, cadmium and copper or a mixture of multiple of the chlorides. According to the invention, the problems of the current mercuric chloride catalyst that the mercury consumption during production is excessively large and the environmental pollution is serious are solved. The activity of the composite mercury catalyst disclosed by the invention is improved by 5-50% compared with that of the pure mercuric chloride catalyst, the utilization efficiency of the catalyst can be effectively improved, the production cost is lowered, and the mercury pollution is reduced.

The present invention discloses an adsorbent for mercury pollution in coom smoke gas, a modified adsorbent thereof, and the preparation and application thereof. By employing the dewatered sludge from the city sewage processing factory as material, the adsorbent for mercury pollution in coom smoke gas is obtained after steps of dipping in chemical medicament, stirring and placing, pyrolysis and charring, and washing and drying. Furthermore, the modified adsorbent obtained by filtering modified element in the surface of the adsorbent can enhance the specific adsorption and the adsorption capability of the mercury of the material, and reduce the used amount of the absorption material. The adsorbent, the modified adsorbent and the compound prepared by the present invention can be used in treatment of the mercury pollution in coom smoke gas in different general operating manners. The adsorbent and the modified adsorbent prepared by the present invention have convenient material source, low production cost, facility application, and remarkable circumstance and economy benefit.

The invention relates to the technical field of bioremediation of heavy metal mercury pollution and discloses enterobacter cloacae, a microbial inoculum containing the enterobacter cloacae, a use of the microbial inoculum and a method for passivation of mercury. The enterobacter cloacae has an accession number of CGMCC NO: 10850. The method for passivation of mercury comprises contacting the enterobacter cloacae having the accession number of CGMCC NO: 10850 and/or the microbial inoculum containing the enterobacter cloacae having the accession number of CGMCC NO: 10850 with a mercury-polluted sample so that mercury in the mercury-polluted sample is passivated. The enterobacter cloacae has high degradation ability to mercury, has a degradation rate of 85.5%, can tolerate high concentration mercury pollution, is easy to operate and can play an important role in bioremediation of mercury-polluted soil or mercury-containing wastewater.

The invention discloses a structured non-mercuric catalyst. The structured non-mercuric catalyst is composed of 80-99.9wt% of a carrier, 0.01-10wt% of an active component and 0-19.99wt% of an assistant; and the carrier is composed of 60-95wt% of silicon carbide foam and 5-40wt% of active carbon, and the active carbon is adhered to the silicon carbide foam. The structured non-mercuric catalyst has a high catalytic activity when the catalyst is used in an acetylene hydrochlorinating reaction for preparing chloroethylene. The structured non-mercuric catalyst solves a mercury pollution problem, and utilizes the good heat conduction property of the silicon carbide foam to rapidly remove heat in order to avoid the temperature runway of a bed, so the production capacity and the product quality are improved. The invention also discloses a preparation method of the structured non-mercuric catalyst. The preparation method comprises the following steps: dissolving the active component and the assistant in water to prepare a solution, immersing the carrier in the solution at 60-80DEG C for 1-3h, and drying to obtain the structured non-mercuric catalyst. The preparation method has the advantages of simplicity, strong operability and good controllability.

The invention discloses an oxidizing method for removing gaseous elemental mercury in boiler fume. According to the method, a medium is utilized to stop a plasma reactor from discharging and generating plasma gas; boiler fume is allowed to flow through a plasma gas region, so that gaseous elemental mercury is converted into mercury ions; and the mercury ions are captured by a dust removing and desulfurizing unit of a downstream flue, thereby realizing cooperative fume purification. The method can control mercury pollution in fume without secondary pollution, comprehensively control gaseous nulvalent mercury in fume, and convert the gaseous nulvalent mercury into bivalent ferrum. The method can be combined with the traditional pollutant control device of boilers to control the mercury emission, thereby reducing the initial investment and saving the operation cost. Since the plasma field can be produced immediately after electrification and can promote the oxidization of SO2 and NOX in the fume, the method can cooperatively purify multiple pollutants. The method adopts a medium to stop discharge and has the advantages of favorable discharge effect, convenient operation and low energy consumption.

The invention discloses a mercury-containing sludge heat treatment method which is characterized by treating mercury-containing sludge with moisture content of over 90% sequentially by a sludge conditioning device with a heating function, a dehydrator, a screw conveyer, a pyrolysis unit, a dust remover, a spraying condensation device, a coalescer and a tail gas treatment device, wherein treatment of the pyrolysis unit sequentially comprises drying treatment, pyrolysis treatment and combustion treatment. The mercury-containing sludge is firstly pre-treated; the pre-treated sludge is fed into the pyrolysis unit; after the sludge is subjected to pyrolysis combustion, formed pyrolysis gas circularly enters a drying section to be utilized; mercury and compounds thereof in the sludge are all changed into mercury vapor; then the mercury vapor is charged into a dust removal unit and a condensation unit to recover liquid mercury. According to the mercury-containing sludge heat treatment method disclosed by the invention, a pyrolysis technology is adopted to carry out harmless treatment on the sludge; heat energy is recycled; sludge treatment energy consumption is reduced; mercury pollution is prevented; moreover, byproducts with a certain value are produced; the mercury-containing sludge heat treatment method not only has economic benefits, but also has social benefits.

The present invention relates to a disposable clinical thermometer and the manufacture method. The temperature is measured and the measured temperature is stabilized by a liquid drainage method, a temperature sensing bulb is a cavity body, colored simethicone temperature sensing liquid and a sodium chloride chip are arranged in the temperature sensing bulb, colorless transparent glycerin assistant fluid or glycerin assistant fluid with obvious color difference with the colored temperature sensing liquid is filled in a capillary pipe, when the temperature is measured, temperature sensing liquid is heated and caused to expand, emitted upwards, raised along the capillary pipe, and the assistant fluid is emitted to the valve body of a temperature locating device. After the temperature is measured, a piston is pressed down, the assistant fluid is emitted to an assistant fluid storehouse through a fluid emission slot, the piston is pressed down and the fluid emission slot is closed, the piston is locked, and simultaneously the chip sodium chloride generates gas in the vacuum state to fill up the space caused by the rise and location of the temperature sensing liquid. The present invention has the advantages that the nontoxic temperature sensing liquid replaces mercury, thus solving the problem of mercury pollution. The measured body temperature is not changed under the influence of the outside temperature, and the disposable operation does not cause cross infection.

The invention relates to a preparation method of zinc alloy powder special for Hg-free battery. The preparatin method of the invention includes the following steps: cleaned and dried high-purity zinc ingots and additional elements of high-purity powder of indium, bismuth and aluminum are put into a main frequency induction furnace and heated up to the temperature of 460 DEG C; the raw materials are melted, evenly mixed, and then poured into a heat preserving leaking package which is heated to 550DEG C for heat preservation; the zinc alloy solution is pulverized into powder by purified and compressed air jet in a pulverized settlement cylinder, then settled and condensed into solid particles in a double-layer pulverized settlement cylinder which is communicated with cooling water; a multi-layer rotating vibrating screen is used for screening and then the zinc powder with qualified granulation is put into a V-shaped mixer for even mixing; the zinc powder is packaged for oxidation prevention after being checked as qualified. The powder of the invention is totally consistent with the quality standard of Hg-free zinc alloy powder and is environmental protection due to no mercury pollution; the adopted pulverization method by compressed air jet has the advantages of simple process, convenient operation, low cost, low labor intensity and small occupied production area; the zinc alloy powder with indium, bismuth and aluminum added without environmental pollution can obviously reduce the amount of hydrogen evolution of the cathode.

The invention discloses a thermal desorption combined utilization and waste heat recycling method and a system adopted by the method. The method comprises the following steps of (1) carrying out drying and directly thermal desorption treatment on low-concentration oil sludge or chlorine-free organic polluted soil, and carrying out cyclone dust removal treatment on generated waste gas; (2) carryingout drying and indirect thermal desorption treatment on high-concentration oil sludge or chlorine-containing organic polluted soil or mercury polluted soil, and sequentially carrying out condensationand oil-water separation treatment on the generated waste gas; and (3) carrying out high-temperature oxidation, two-stage heat exchange cooling treatment and tail gas treatment on the waste gas in the step (1) and the non-condensable gas in the step (2), and then discharging. The system consists of a directly-heated thermal desorption system, an indirectly-heated thermal desorption system and a tail gas purification and waste heat recycling system; pollutants are treated in a classified mode, the treatment amount is large, the treatment efficiency is high, and safety and environment friendliness are achieved; and generated waste heat is recycled to the maximum extent, energy is saved, consumption is reduced, resource recovery is achieved while pollution treatment is achieved, and sustainable development is facilitated.

The invention discloses an integral in-situ mercury pollution repair device and a repair method thereof. The device comprises a frame and a box; rollers are mounted at the lower end of the frame; connecting columns are respectively arranged at the front and back two ends of the frame; the upper end of the box is screwed with an end cover; a pull ring is arranged on the end cover; an isolation plate is arranged at the lower end of the box; a mounting plate is arranged in the isolation plate; and insertion pipes are uniformly mounted on the mounting plate. The device has no need to carry soil in use, can repair mercury ion-polluted soil in situ, saves unnecessary steps, realizes miniaturization, can conveniently replace a porous resin absorbing plate, can renewedly extract and recycle mercury elements therein to prevent reflowing into water and soil, protects the soil to the greatest extent, and is higher in practical value.

The invention relates to a light stick type LED lighting source. The prior filament lamp or the fluorescent tube used for illumination has the defects that the power consumption is huge, the service life is short, the lighting time is long, the mercury pollution is easy to be caused during the manufacturing process, and the light ray lack the softness and the evenness. The light stick type LED lighting source is composed of a LED light source, a high-efficiency light guiding stick, a reflecting film, a directional reflecting cover and an outer casing, wherein the LED light source and PCB board are arranged on one or two side faces of the geometrical body formed by the high-efficiency light guiding stick, a V shaped light reflecting slot is arranged on the upper surface of the high-efficiency light guiding stick, the reflecting film is positioned on the upper surface of the high-efficiency light guiding stick, the directional reflecting cover is positioned on the front face of the high-efficiency light guiding stick, and the invention can be a single pipe or a multi-pipe light stick type LED lighting source. The light stick type LED lighting source has the advantages of energy saving, environmental protection and long service life; as one of the future light sources which are most interested in by the people, the direct aim of the LED lighting source is to replace the filament lamp or the fluorescent tube, thereby the LED lighting source has a good economic benefit and social benefit.

Disclosed is a mercury pollution soil thermal desorption and mercury recovery method. The method comprises the steps that 1, chlorine salt is added, wherein after mercury pollution soil is broken and levigated, the chlorine salt is added, water is added for sufficient stirring to obtain slurry; according to the additive amount of the chlorine salt, the molar concentration of hydrolyzed chloride ions is higher than that of mercury in soil; 2, pH is adjusted, wherein the pH of the slurry is adjusted by means of an acid water solution to range from 6.5 to 7.5; 3, air drying is performed, wherein the slurry is naturally dried; 4, breaking is performed, wherein the naturally-dried slurry is broken, 5-mesh undersize fine soil is used as soil to be processed for follow-up processing; 5, thermal desorption is performed, wherein thermal desorption is performed on soil to be processed at the temperature of 150 DEG C to 300 DEG C, mercury is recycled under natural cooling, and soil obtained after thermal absorption is used for other purposes; and 6, mercury is recycled, wherein a mercury-contained compound obtained after thermal desorption is performed is recycled at room temperature. The invention further discloses integrated equipment for implementing the mercury pollution soil thermal desorption and mercury recovery method.

The microwave method of reducing mercury content in mercury contaminated material includes the following steps: 1. setting the mercury contaminated material inside one microwave reactor; 2. providing airflow to the microwave reactor to stir the mercury contaminated material; and 3.exposing the mercury contaminated material to microwave radiation to raise the temperature to over 357 deg.c, so as to produce vapor containing mercury and the treated material. The said method may be also used to reduce contents of mercury and carbon simultaneously, and some no-carbon material may be used in the reactor.