7606 results about "Sulfur dioxide" patented technology

Process for removing mercury from flue gases of high-temperature plants, in particular power stations and waste incineration plants in which a bromine compound is fed to the multistage furnace and/or the flue gas in a plant section downstream of the furnace, the temperature during contact of the bromine compound with the flue gas being at least 500° C., preferably at least 800° C. The combustion is carried out in the presence of a sulphur compound, in particular sulphur dioxide. Subsequently to the furnace, the flue gas is subjected to an optional multistage cleanup for removing mercury from the flue gas, which cleanup comprises a wet scrubber and/or a dry cleanup.

A combustion analyzer apparatus and method for combustion analysing a sample, the analyzer comprising a combustion chamber (82) for receiving a sample for combustion therein to form combustion products, and a fluid supply apparatus for supplying fluid(s) into the chamber. The fluid supply apparatus (130-140) comprises a nitrogen oxides (NO_x) generating apparatus (140,190,210,240) and is arranged to supply NO_x into the combustion chamber. A yield of sulphur dioxide in the combustion products may thereby be improved. The NO_x generating apparatus may be operated at a raised working temperature. The NO_x generating apparatus may be provided by an ozonator with a supply of nitrogen and oxygen. A Venturi tube arrangement (246) may draw the generated NO_x into a (carrier or oxygen) gas line to the combustion chamber. Ozone may be supplied to the combustion products to convert nitrogen monoxide therein to nitrogen dioxide. The NO_x and ozone may be supplied by a single device (210,240).

The invention provides a method for preparing lithium cobaltate by directly using an invalid lithium ion battery. The method comprises the following steps: crushing the invalid lithium ion battery or scraps generated when a lithium cobaltate battery is produced by a mechanical crusher at normal temperature; adding water and one or more of acetic acid, sulfuric acid, hydrochloric acid or nitric acid to produce mixed aqueous solution of the battery scraps and acid; filling the mixed aqueous solution into a hermetic pressure reactor, and controlling the temperature in the reactor to be between 50 and 150 DEG C; introducing or adding one leaching additive of sulfur dioxide or hydrogen, or adding hydrazine hydrate; stirring and leaching, cooling, and filtering; adding one precipitator of sodium carbonate, potassium carbonate and ammonium carbonate, or adding composite precipitator consisting of one of the sodium carbonate, the potassium carbonate and the ammonium carbonate and one of sodium hydroxide and potassium hydroxide to obtain mixture of lithium carbonate, cobalt carbonate and cobalt hydroxide; drying and calcining at high temperature to produce a lithium cobaltate product. The method is particularly suitable for the treatment scale of medium-sized and small enterprises, and is an effective method for directly materializing cobalt secondary resources.

A gas cleaning system, which is operative for cleaning a process gas containing carbon dioxide and sulphur dioxide, comprises a combined cooling and cleaning system (16), and a CO₂-absorber. The combined cooling and cleaning system (16) comprises a first gas-liquid contacting device (50) located upstream of the CO₂-absorber and operative for cooling the process gas by means of a cooling liquid, and for absorbing into the cooling liquid sulphur dioxide of the process gas, such that a cooling liquid containing sulphate is obtained. The combined cooling and cleaning system (16) further comprises a second gas-liquid contacting device (94) located downstream of the CO₂-absorber and operative for removing ammonia from the process gas, which has been treated in the CO₂-absorber, by means of bringing the process gas containing ammonia into contact with the cooling liquid containing sulphate.

The present invention relates to amino acid ion liquid for absorbing acidic gas. The anion of ion liquid is amino acid, amino acid ramification, similar to amino acid ion, imidazole cation, phosphoric cation, amine cation, ammoniumate cation and etc. After dipping craft, all ions can adhere to poriferous solid to absorb acidic gas such as carbon dioxide, sulfur dioxide emitted by flue and motor vehicles.

The invention relates to a low-temperature smoke denitration SCR (silicon controlled rectifier) catalyst, which comprises a carrier, a manganese oxide, and composite oxide of one or more of Ce, Zr, Ti, Co, Fe and Cu, the mass content of manganese is 0.1-66 percent, and the total mass content of the Ce, Zr, Ti, Co, Fe or/and Cu is 0-50 percent; and glass fiber and/or kieselguhr is used as the carrier, wherein the glass fiber of the carrier is calcined for 2-4 hours at temperature of 400-600 DEG C, then placed in a nitric acid, sulfuric acid or hydrochloric acid solution with mass concentration of 5-40 percent for acidizing for 1-8 hours, washed by distilled water to be neutered, dried at temperature of 80-120 DEG C, and crushed to have the fineness of 20-325 meshes. The catalyst uses the glass fiber and the kieselguhr as the carriers, so that the dispersion effect of nanoparticles and specific surface area of the catalyst are increased, the high adsorptive capacity and strong heat resistance and corrosion resistance capacity are achieved, stronger toxic resistance capacity to sulfur dioxide and stream contained in the smoke is realized, the invention can be used for 10-200 DEG C of low temperature smoke denitration, and has strong water resisting and sulphur toxic resisting capacities.

The invention relates to a method for realizing desulfuration, denitration and demercuration of boiler smoke synchronously, wherein it comprises feeding smoke into cycle fluidize bed reactor, and injecting oxygen-enriched active absorber; said absorber is formed by coal ash at 20-70, lime hydrate at 27-80, additive at 0.5- 3 as kalii permangana KMnO4, sodium chlorite NaClO2, natrii chloridum NaCl, calcium hypochlorite Ca(ClO)2 or acetic hyctro peroxide CH3COOH. The invention's desulfuration efficiency can reach 90%, the denitration efficiency can reach 60%, and the demercuration can reach 50%, with low cost and non pollution.

A process for removing hydrogen sulfide, other sulfur-containing compounds and/or sulfur and mercury from a gas stream contaminated with mercury, hydrogen sulfide or both. The method comprises the step of selective oxidation of hydrogen sulfide (H₂S) in a gas stream containing one or more oxidizable components other than H₂S to generate elemental sulfur (S) or a mixture of sulfur and sulfur dioxide (SO₂). The sulfur generated in the gas stream reacts with mercury in the gas stream to generate mercuric sulfide and sulfur and mercuric sulfide are removed from the gas stream by co-condensation.

A method for generating energy and/or fuel from the halogenation of a carbon-containing material and/or a sulfur-containing chemical comprises supplying the carbon-containing material (e.g., coal, lignite, biomass, cellulose, milorganite, methane, sewage, animal manure, municipal solid waste, pulp, paper products, food waste) and/or the sulfur-containing chemical (e.g., H₂S, SO₂, SO₃, elemental sulfur) and a first halogen-containing chemical to a reactor. The carbon-containing material and/or the sulfur-containing chemical and the halogen-containing chemical are reacted in the reactor to form a second halogen-containing chemical and carbon dioxide, sulfur and/or sulfuric acid. The second halogen-containing chemical is dissociated (e.g., electrolyzed) to form the first halogen-containing chemical and hydrogen gas (H₂). The first halogen-containing chemical can be Br₂ and the second halogen-containing chemical can be HBr. Any carbon dioxide formed during reaction can be directed to a prime mover (e.g., turbine) to generate electricity. Any ash and/or sulfur formed can be removed. In some cases a sulfur-containing chemical can be supplied to the reactor with the carbon-containing material.

The invention discloses a waste lead recovering method for lead-acid storage batteries. The method comprises the following steps: fine stuff such as diachylon and the like are added in a reaction kettle with a stirring device; reducing agent (FeSO4) and dilute sulfuric acid are simultaneously added; stirring reaction is carried out at the temperature of 50-60 DEG C for 50-70 minutes so as to reduce lead dioxide into lead sulfate; the lead sulfate is added into the reaction kettle with the stirring device; water is simultaneously added into the reaction kettle for size mixing; then sodium carbonate is added; desulfuration is carried out at the temperature of 50-60 DEG C so as to obtain solid lead carbonate; the lead carbonate is put into a smelting furnace and then decomposed at the temperature of 320-350 DEG C so as to obtain lead oxide; and reducing agent (carbon) is added into the smelting furnace to reduce the lead oxide into metal lead at the temperature of 700-800 DEG C. The method recovers the lead by means of the combination of the wet and the dry processes, thereby avoiding the harm to the environment caused by lead dust, lead vapor, lead skim, sulfur dioxide gas, and the like by adopting fire smelting. The method has the advantages of high lead recovery rate, low energy consumption and no environment pollution.

Decontamination formulations for neutralization of toxic industrial chemicals, and methods of making and using same. The formulations are effective for neutralizing malathion, hydrogen cyanide, sodium cyanide, butyl isocyanate, carbon disulfide, phosgene gas, capsaicin in commercial pepper spray, chlorine gas, anhydrous ammonia gas; and may be effective at neutralizing hydrogen sulfide, sulfur dioxide, formaldehyde, ethylene oxide, methyl bromide, boron trichloride, fluorine, tetraethyl pyrophosphate, phosphorous trichloride, arsine, and tungsten hexafluoride.

The invention relates to an ammonia process flue gas treatment method for acidic tail gas. The method includes the steps of: 1) controlling the sulfur dioxide concentration of tail gas entering an absorption tower at a level of less than or equal to 30000mg/Nm<3>; 2) arranging process water in an absorption tower entrance flue or in the absorption tower or cooperating with a ammonium sulphate solution to perform spray cooling; 3) disposing an oxidation section in the absorption tower, setting an oxidation distributor at the oxidation section to achieve oxidation of a desulfurized absorption liquid; 4) arranging an absorption section in the absorption tower, utilizing an absorption liquid distributor in the absorption section to realize desulfurization spray absorption by an ammonia-containing absorption liquid, which is fed through an ammonia storage groove; 5) arranging a water washing layer at an absorption section upper part in the absorption tower, washing the absorption liquid in the tail gas by the water washing layer and reducing the absorption liquid escape; and 6) setting a demister at the upper part of the water washing layer in the absorption tower to control the mist drop content in the purified tail gas. Employment of the Claus sulfur recovery and ammonia process desulfurization integrated desulfurization technology in the coal chemical industry can reduce the investment cost of after-treatment, the process can be simpler, and factory environmental protection treatment can form an intensive advantage.

The invention relates to a loading activated carbon and ití»s preparing method. The invention uses activated carbon as carrier and the additive components are loaded on the activated carrier via immersion method, while the additive components is distributed over most surfaces of pore passages of said activated carbon, and the additive components is 0.01-50% of absorbent. The invention is prepared via the immersion method which is processed in the temperature higher than room temperature. The invention can overcome the defect of present technique by which additive components can not be distributed over most pore passages; therefore, it can improve the availability ratio of activated carbon and the application property. In addition, according to the difference of said additive components and their contents, the invention can apply the processes of gas desulfurization, flue gas desulfurization, and exhaust gas purification.

The invention provides a process used for removing multiple contaminants in the off-gas of a sintering machine, as well as the system thereof. The process has the following steps: firstly, the machine tail off-gas undergoes SCR denitrification treatment; then, primary dedusting treatment is carried out to the denitrated machine tail off-gas and un-denitrated machine head off-gas at the same time, so as to remove the dust and ash particles in the off-gas; and then, circulating fluidized bed desulfurization treatment is carried out to the off-gas; finally, secondary dedusting treatment is carried out to the off-gas, so as to remove the resultant particles in the off-gas, the resultant particles are used for recycling, and the purified gas is separated out. The system thereof is mainly composed of a machine head off-gas header and a machine tail off-gas header which are used for collecting the machine head off-gas and the machine tail off-gas of the sintering machine, a SCR denitrification reactor which is used for removing the multiple contaminants in the off-gas, a primary dust remover, a circulating fluidized bed desulfurization reactor and a secondary dust remover. The process can carry out the classification integrated processing as well as the high efficient and synchronous removing to the sulfur dioxide, the nitrogen oxides and the dust in the sintering off-gas. The system has the characteristics of simple and compact whole design, low investment and running cost, and stable and reliable working.

The invention discloses a comprehensive recovery method of complex polymetal sulphide ore containing copper, lead and zinc and adopts dressing-metallurgy combination method and hydrometallurgy-pyrometallurgy combination method to recover metals. The recovery method comprises the following steps: first performing bulk flotation to the complex polymetal sulphide ore, fine grinding the obtained concentrate, leaching by using two-step counter flow oxygen pressure leaching process, extracting and separating copper and zinc from the obtained leachate, electrodepositing the strip liquor of copper-loaded organic phase to obtain cathode copper, cleaning the obtained raffinate and electrodepositing to obtain cathode zinc; pressurizing leaching residue to perform flotation separation and obtain sulfur concentrate and lead silver residue, distilling sulfur concentrate to obtain sulfur; performing lead smelting process to lead silver residue to obtain electrolytic lead product and lead anodic slime; and comprehensively recovering noble metals such as gold, silver and the like from lead anodic slime. The method can greatly improve the metal recovery rate, resource utilization and the economic efficiency of mines and generate a lot of sulfur so as to obviously reduce the sulfur dioxide pollution to the atmosphere.

The invention relates to a coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and a technology. The technology provided by the invention comprises the following steps of: using coal dust in a coal-fired power plant as a raw material, simultaneously carrying out carbonization and activation on coal dust in an activated coke preparation reactor to obtain powdered activated coke, using pyrolysis gas obtained during the preparation process as reburning fuel and sending it into a boiler so as to remove part of NOx; sending the powdered activated coke into a flue gas adsorption tower, adsorbing pollutants such as sulfur dioxide, mercury and the like at an appropriate temperature, injecting ammonia gas and nitrogen oxide to perform a catalytic reduction reaction so as to remove nitrogen oxide; reusing the adsorbed activated coke after regeneration; sending the activated coke into the boiler for combustion after multiple adsorption/regeneration; regenerating the activated coke after adsorbing sulfur dioxide to obtain high-density sulfur dioxide gas to realize resource utilization. By the utilization of coal resources in a coal-fired power plant, the comprehensive purification of flue gas and the resource utilization of sulfur dioxide are realized without discharge of waste water, exhaust gas and solid waste.

A treatment method for wastewater employing sulfur dioxide and lime chemical dewatering technology in conjunction with an environmental photo biomass/algae biological treatment system growing photo biomass/algae to reduce dissolved solids, heavy metals, and ammonia in the wastewater to produce recovered treated wastewater for vegetation consumption, biofuel feedstock, and biofuel and carbon credits.