275results about How to "High sulfur content" patented technology

The invention belongs to the technical field of metallurgical waste slag recovery and in particular relates to a comprehensive recycling method of cyanide tailing slag. Cyanide tailings is floated to obtain sulfur concentrate and tailing, sulfur concentrate is roasted by weak oxygen to obtain sulfuric acid, and pyritic slag is subjected to chlorination roasting to enable valuable elements to be recycled. By virtue of the comprehensive recycling method disclosed by the invention, the valuable elements can be efficiently separated and recovered from cyanide tailing slag, and cyanide tailing slag is utilized to a maximum extent, the comprehensive utilization efficiency of resources is improved and the pollution of cyanide tailing slag to the environment is reduced.

A catalyst system for the reduction of NO_x comprises a catalyst comprising a metal oxide catalyst support, a catalytic metal oxide comprising at least one of gallium oxide or silver oxide, and at least one promoting metal selected from the group consisting of silver, cobalt, molybdenum, tungsten, indium, bismuth and mixtures thereof. The catalyst system further comprises a gas stream comprising an organic reductant, and a compound comprising sulfur. A method for reducing NO_x utilizing the said catalyst system is also provided.

The present invention provides a regenerable catalyst composition suitable for entrapping SO_x. The composition of the invention comprises a copper oxide having the formula (Cu/(A oxide) where A oxide is SiO₂, Zr—SiO₂, A1₂O₃, TiO₂—Al₂O₃, ZrO₂ and In₂O₃ or mixtures thereof. Copper loading may vary from about 10 to 60 mol % and is preferably about 25 mol %. The catalyst composition adsorbs SO_x as metal sulfate under lean conditions and desorbs accumulated SO_x as SO₂ under rich conditions. Such reversible SO_x trap are able to operate under conventional NO_x trap operating conditions to prevent sulfur poisoning of the NO_x trap. Furthermore, these traps may be regenerated under rich conditions at 300-450° C. In another embodiment of the present invention, an irreversible SO_x trap capable of collecting SO_x under lean conditions is provided. The traps of this embodiment include praseodymia, zirconia-praseodymia and mixed manganese-yttria and mixtures thereof.

The invention relates to a molten steel smelting technology for preventing nozzle clogging during sulfur-containing aluminium-containing steel pouring process. The molten steel smelting technology comprises the steps of converter or electric furnace steelmaking, LF steel ladle refining, VD or RH vacuum refining, and continuous steel casting. According to the molten steel smelting technology, molten iron without desulfuration is directly supplied to a converter or an electric furnace for steelmaking, and iron sulfide powder is added into slag in the later period of LF steel ladle refining, so that the content of sulfur elements in the slag is increased, the reaction between the molten steel and the slag is inhibited during the vacuum treatment process, the loss amount of S elements in the molten steel is decreased, Al2O3 inclusions and CaS inclusions which are liable to cause nozzle clogging are reduced, the problem of nozzle clogging can be eliminated, the production is guaranteed to be smoothly carried out, and the production cost is reduced.

Copolymerization of elemental sulfur with functional comonomers afford sulfur copolymers having a high molecular weight and high sulfur content. Nucleophilic activators initiate sulfur polymerizations at relative lower temperatures and in solutions, which enable the use of a wider range of comonomers, such as vinylics, styrenics, and non-homopolymerizing comonomers. Nucleophilic activators promote ring-opening reactions to generate linear polysulfide intermediates that copolymerize with comonomers. Dynamic sulfur-sulfur bonds enable re-processing or melt processing of the sulfur polymer. Chalcogenide-based copolymers have a refractive index of about 1.7-2.6 at a wavelength in a range of about 5000 nm-8μιτι. The sulfur copolymer can be a thermoplastic or a thermoset for use in elastomers, resins, lubricants, coatings, antioxidants, cathode materials for electrochemical cells, dental adhesives/restorations, and polymeric articles such as polymeric films and free-standing substrates. Optical substrates are constructed from the chalcogenide copolymer and are substantially transparent in the visible and infrared spectrum.

The invention provides a sulfur-carrying active carbon for smoke gas demercuration and a preparation method thereof. The mass percentage content of sulfur of the sulfur-carrying active carbon is 18-30%, and the sulfur is evenly distributed on the surface of the active carbon and chemically combined with the active carbon; the granularity of the sulfur-carrying active carbon is 20-40 meshes.The preparation method comprises material preparation, thermo-precipitation preparation and cooling. In the invention, cheap sulfur is used as an additive agent of the active carbon, the content of the sulfur in the active carbon can reach 18-30% through the method of thermo-precipitation, and mercury in the smoke gas can be desorbed effectively. After the technique of thermo-precipitation, the active carbon has the advantages that the content of the sulfur is high and the sulfur is evenly distributed on the surface of the active carbon. In addition, the specific surface area, pore volume and pore diameter property and the like of the active carbon remain the same; the invention also is characterized in that the technique and the method are simple, the operation is easy and the cost is low, the method can be widely applied to the demercuration of smoke gas of coal-fired power factory and the like.

A hydrocatalyst for decreasing S and olefine contents in poor gasoline and increasing its octane value is prepared from the metallic active component which is two or three of MoOe, CoO and NiO and the carrier prepared from TiO2, modified ZSM-5 molecular sieve and adhesive.

A leadless free-cutting copper alloy and a preparation method. The copper alloy comprises the following elements by mass: 58.0%-96.0% of copper, 2.0%-2.9% of manganese, 0.2%-6.0% of tin, not more than 0.3% of phosphor, not more than 0.3% of nickel, 0.10%-0.19% of sulfur, 0.1%-0.9% of the sum of 1-3 elements selected from silicon, iron, molybdenum, tungsten, and cobalt, and the balance of zinc. In the alloy, the mass ratio of manganese and sulfur is more than 10 and less than 30; the other elements are impurities, and the mass fraction of any one of the impurities is not more than 0.03%; the sum of the mass fractions of all the impurities is not more than 0.5%. The preparation method comprises the following steps: melting and alloying the base metal element of copper and the important metal element of manganese, adding other alloy elements and performing homogenization, performing refining, adding sulfide or sulfur, performing homogenization and adding zinc rapidly, immediately casting into a ingot casting or performing atomization to obtain powder. The leadless free-cutting copper alloy and the preparation method of the invention are applicable to cutting processing, hot forging processing, and polishing processing of copper alloy.

The invention relates to carbon preparation material and sulfuric active carbon based on the modification of coke and a preparation method thereof. The invention adopts the scheme that the preparation method comprises the following steps: dipping the coke in KOG solution for 1 to 24 hours at the temperature of 20 to 100 DEG C, wherein the mass ratio of KOH and the coke is 0.05 to 0.5:1; carrying out heat treatment to the coke after being dipped for 1 to 5 hours under the condition of inert atmosphere and 300 to 700 DEG C; then cooling the coke to the room temperature; and finally preparing the carbon preparation material after the coke is washed and dried. The carbon preparation material prepared can react for 1 to 5 hours under the conditions that the mass ratio of active gas flow rate and the carbon preparation material is 5 to 30:1 L/min/kg and the temperature is 350 to 850 DEG C, so as to prepare the sulfuric active carbon. The invention has the advantages of saved alkali consumption and energy consumption, shortened activating treatment time, high yield, and reduced corrosion resistant requirements of the material; the prepared carbon preparation material has high reaction activation; and the sulfuric active carbon prepared by the carbon preparation material has larger specific surface area and high sulphur content, and exits in a straight chain sulfuric shape as the subject of S2 and S6.

The present invention relates to a pseudo-boehmite, a preparing method and aluminium oxide prepared from the pseudo-boehmite. For the pseudo-boehmite, n is not smaller than 1.1 and not bigger than 2.5, n=D (031) / D (120), the D (031) represents the crystal grain size of the crystal surface represented by 031 peak in the x-ray diffraction (XRD) spectrum of pseudo-boehmite crystal grains, and the D (120) represents the crystal grain size of the crystal surface represented by 120 peak in the XRD spectrum of the pseudo-boehmite crystal grains. The 031 peak refers to the peak of which the 2thet is from 34 degrees to 43 degrees in the XRD spectrum, the 120 peak refers to the peak of which the 2thet is from 23 degrees to 33 degrees, D=klam( Bcos thet), K is a Scherrer constant, lam is the diffraction wave length of a target type material, B is the half-peak width of the diffraction peak, and 2thet is the position of the diffraction peak. Aluminium oxide obtained by roasting the pseudo-boehmite is more suitable for being used as a catalyst carrier. The catalyst has superior hydrgen desulphurization properties.

The invention belongs to the field of lithium-sulfur battery cathode materials and particularly relates to a preparation method of a preparation method of biomass-based porous carbon/sulfur composite, comprising the specific steps of S1, calcining biomass material to obtain a primary product of carbon material; S2, removing impurities from the primary product of carbon material to obtain biomass carbon material; S3, mixing well the biomass carbon material with an activator and water, and calcining to obtain activated mixture; S4, removing impurities from the mixture to obtain activated porous carbon material; S5, mixing the porous carbon material with sulfur for the purpose of reacting to obtain the porous carbon/sulfur composite. The invention also discloses application of the porous carbon/sulfur composite as a cathode material in batteries or supercapacitors. A battery prepared with the biomass carbon/sulfur composite prepared herein has high discharge capacity, good cycle stability and high coulombic efficiency, and has a promising application.

The invention discloses an adsorbent for removing mercury from flue gas and a method for preparing the same. The adsorbent comprises active carbon and sulfur evenly distributed on the surface of the active carbon; the grain size of the active carbon is between 20 and 40 meshes, and the mass percentage content of the sulfur is between 1 and 17 percent; in the method, the low-priced sulfur is used as the additive of the active carbon, and the adsorbent is obtained by the thermal precipitation method, thereby effectively removing the mercury from the flue gas; the adsorbent has the characteristics of high sulfur content, even distribution of sulfur on the surface of the active carbon and the like, and in the aspects of specific surface area, pore volume, pore diameter, and the like, the active carbon also has the advantages of the common active carbon; the adsorbent can be placed in a fixed adsorption bed or fluidized adsorption bed; when the adsorbent is used to remove mercury from the mercury-containing flue gas and other gases, the adsorbent can achieve obvious effect and long time of usage; moreover, the adsorbent has the advantages of simple technological process, easy operation and low cost, and can be widely applied to the mercury removal of the flue gas in a coal-fired power plant.

The sulfide of the present invention comprises an amorphous (lithium) niobium sulfide having an average composition represented by formula (1): Li_k1NbS_n1 (wherein 0≦k1≦5; 3≦n1≦10; and when n1≧3.5, k1≦0.5), or an amorphous (lithium) titanium niobium sulfide having an average composition represented by formula (2): Li_k2Ti_1-m2Nb_m2S_n2 (wherein 0≦k2≦5; 0<m2<1; 2≦n2≦10; and when n2≧3.5, k2≦1.5). The sulfide of the present invention is a material that is useful as a cathode active material for lithium batteries, such as lithium primary batteries, lithium secondary batteries, and lithium ion secondary batteries, and has a high charge-discharge capacity, high electrical conductivity, and excellent charge-discharge performance.

A process and system for recovering waste heat from a kiln used for lime or cement production. The system unifies the kiln, a waste heat recovery and power generation circuit and a dry scrubber for scrubbing the pollutants from the kiln offgas. Essentially, the system employs the boiler component of the waste heat recovery and power generation circuit as a heat exchanger to recover the waste heat from the kiln, which is used to drive the steam turbines. The heat absorption from the latter stage lowers the temperature of the kiln offgas sufficiently for optimum performance from the scrubber. The presence of lime particles in the offgas effectively protects the boiler tube surfaces from corrosion which would occur at optimum scrubber temperatures, and subsequently provides the lime required as a scrubbing medium for the dry scrubber. Further, the efficient scrubbing allows for the use of any fuel for firing the kiln inclusive of high sulphur content compounds. A process for effecting the technology is also provided.

The invention discloses a thin-wall local graphitization porous carbon sphere material, a preparation method thereof and application thereof in a lithium sulfur battery. The porous carbon sphere material is a local graphitization porous carbon nanosphere with thin wall holes; the preparation method of the thin-wall local graphitization porous carbon sphere material comprises the steps that water-base resin, water-soluble inorganic salt, a surface active agent and transition metal salts are dissolved into water to obtain a spraying solution; the spraying solution is sprayed and dried to obtaina local graphitization porous carbon nanosphere precursor; the local graphitization porous carbon nanosphere precursor is subjected to pyrolysis to obtain the thin-wall local graphitization porous carbon sphere material. The preparation method is simple in technology and good in repeatability, the prepared thin-wall local graphitization porous carbon sphere material has the advantages of being good in electrical conductivity, large in aperture, high in specific surface area and the like, the thin-wall local graphitization porous carbon sphere material is applied to a lithium sulfur battery sulfur carrier, the high specific capacity, long cycling stability and high rate capability are achieved, and the wide application prospect is achieved.

The invention relates to a method for treating chrome-containing wastewater by catalytic reduction of a petaloid magnetic iron oxide/molybdenum sulfide composite. The method comprises the following steps: weighing ferrous sulfate heptahydrate and sodium chlorate, dissolving in deionized water, stirring until the solution becomes light yellow, reacting in a high-pressure reaction kettle, carrying out centrifugal separation to obtain ferric oxide, drying, and pulverizing into powder; weighing the ferric oxide powder, molybdenum trisulphate dihydrate and thiocarbamide, dissolving in deionized water, stirring uniformly, transferring the mixture into a high-pressure reaction kettle, reacting, and carrying out centrifugal separation; cleaning with ethanol and deionized water; and drying to obtain the ferric oxide/molybdenum sulfide composite finished product, adding the finished product into hexavalent-chrome-containing wastewater with the initial concentration of 5-20 mg/L, stirring uniformly, irradiating with a metal halide lamp for more than 30 minutes, determining the hexavalent chrome concentration after treatment, and calculating the removal rate. The ferric oxide/molybdenum sulfide composite for treating hexavalent-chrome wastewater has the advantages of high removal rate and low treatment cost.

The invention provides a preparation method of an emulsion antioxidant product and belongs to the technical field of preparation of synthetic material antioxidant products. The emulsion antioxidant product is used for acrylonitrile butadiene styrene acrylonitrile butadiene styrene (ABS) grafting powder by means of an emulsion polymerization technology. Phenolic antioxygen Wingstay-L, an active ion radical trapping agent and a methylene di-sulfo ester compound are compounded according to the proportion to form a complex antioxidant, the complex antioxidant, isotridecyl alcohol polyoxyethylene ether or nonyl phenol polyoxyethylene ether and a dilution dispersing agent are mixed and stirred through a high speed shearing machine at the heating condition of 80-120 DEG C to form a homogeneous mixed liquid, and quantitative deionized water and an anionic surface active agent are added to continue to perform high speed shearing and stirring so as to obtain the antioxidant product having a water-soluble particle emulsion state, namely the emulsion antioxidant product.

The invention provides a new technology of thermal solution extraction of high-sulfur fertilizer coal and application thereof in coking coal blending. In the new technology, the high-sulfur fertilizer coal is continuously treated by thermal extraction in a fixed bed reactor or thermal solution extraction in a clearance type reaction still with an organic solvent under proper conditions, after thermal state filtering and separation, a high yield high-sulfur and low-ash thermal solution product is obtained, and the product is used for coking coal blending. By such thermal solution extraction, all the ash component and inorganic sulfur of the thermal solution product are removed, in comparison with the original high-sulfur fertilizer coal, the cohesiveness of the thermal solution product is improved, the sulfur content is reduced obviously, the sulfur is completely the organic sulfur, and the organic sulfur is easy to remove in the subsequent coking process. With the thermal solution product used in the coking coal blending process, the coke quality can be improved obviously, the sulfur content of the coke is lowered, or on the premise of guaranteeing the coke quality, the non-coking coals, such as the subbituminous coal, can be properly added, so that the coal blending coking cost can be lowered, and the coking coal source is stabilized and expanded.

The invention relates to a preparation method of a nano lanthanum oxide/graphene/sulfur composite material. The method comprises the following steps: adding a carbon disulfide/sulfur solution into a graphene oxide/nano lanthanum oxide mixed suspension liquid, and performing hydrothermal reaction in a stainless steel reaction kettle for 5 to 24 h; and cleaning, and vacuum freeze-drying, thus obtaining the nano lanthanum oxide/graphene/sulfur composite material. According to the preparation method, the reduction of the graphene oxide, the doping of nano metal oxide and the thermal reaction of the loaded sulfur solvent are innovatively completed in one step, so that the reaction efficiency is improved, the preparation process is simple, and the weaknesses in the prior art that the utilizationrate of the lithium-sulfur battery positive active substances is low, the rate capacity is poor, the cycle life is short, the reaction efficiency is low, and the preparation process is complex are overcome.

The invention relates to a method for purifying crude sulfur, in particular to a method for purifying the byproduct crude sulfur of coke-oven gas of coke plant by a vacuum distillation method, belonging to the technical field of coal chemical. By adopting the vacuum distillation method, the vacuum distillation is carried out in an external heating typed vacuum furnace under the conditions of 5-400Pa of system pressure, 50-100 DEG C of distillation temperature and 15-120 minutes of distillation time, thus gaining the sulfur with the purity reaching national class-A. Furthermore, according to raw material composition and the requirement of product purity, one-step distillation or two-step distillation or multi-step distillation can be selected to purify the raw material and gain the sulfur product of needed quality. The method has the advantages of simple process flow, low sulfur purification cost, small environmental pollution, good industrial prospect, and the like.