52results about "Ammonium sulfites" patented technology

The invention relates to a method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in a coking plant, which comprises the following steps of: preparing saturated solution of copper sulfate, mixing the saturated solution with desulfuration waste liquor, and heating and stirring; performing solid-liquid separation to obtain a solid and sulfate liquid; adding aqueous alkali into the solid, heating at the temperature of between 50 and 98 DEG C, and stirring and reacting for 10 to 120 minutes; performing solid-liquid separation on slurry obtained by heating; concentrating the obtained liquid, and freezing for crystallizing and drying to obtain a high-purity thiocyanate product; calcining the obtained solid, adding solution of sulfuric acid, and stirring to produce the copper sulfate for circular use; adding activated carbon into the sulfate liquid, and aerating and oxidizing to purify sulfate; and concentrating the sulfate, and crystallizing and drying to obtain a high-purity sulfate product. The method solves the problem of pollution of the desulfuration waste liquor to the environment, and simultaneously, pollutants can become value products through the production of the high-purity thiocyanate product and the high-purity sulfate product.

The invention relates to a method for removing and recycling SO2 in high-sulphur boiler flue gas and discloses a method utilizing ammonia water as material and recycling desulfuration to prepare ammonium bisulfite with high SO2/NH3 value and high purity. The method comprises the steps of (1) performing dry dedusting on high-sulphur boiler flue gas, and cooling through wet dust collection, (2) utilizing ammonia water as absorbents to absorb SO2 in flue gas in a triple tandem desulfurizing absorption tower, controlling the absorbing temperature through an exterior circulation cooling mode, preparing ammonium bisulfite solution with high SO2/NH3 value, and discharging with standard level after water scrubbing and demisting, (3) removing high chemical valence insoluble heavy metal ions such as ferric iron through microfiltration, and (4) removing heavy metal ions through chelating ion exchange resins to obtain products. According to the method, the concentration of SO2 in flue gas after desulfurization is low, SO2 in high-sulphur boiler flue gas is effectively recycled, and ammonium bisulfite solution with high SO2/NH3 value and high purity is prepared.

Methods, systems, and apparatuses for anaerobic digestion of waste fibrous material and the recovery of nutrients are provided. Methods, systems, and apparatuses disclosed herein provide mechanisms to release dissolved gases from anaerobic digester effluent. Methods, systems and apparatuses disclosed herein can recover one or more nutrients from anaerobic digested effluent using a range of temperatures, aeration rates, aeration times, pH ranges, and settling times.

The invention discloses twin tower type recovering sulfur resource ammonia desulfuration equipment and a method. The equipment comprises a dynamic wave washing tower, a primary absorption tower, a secondary absorption tower and the like; the exhaust gas passes through the dynamic wave washing tower to remove ash and passes through a dynamic wave washer to lower the temperature, and then enters the primary absorption tower and the secondary absorption tower in sequence; the primary absorption tower and the secondary absorption tower are both provided with five spraying layers; the lower three spraying layers spraying and absorbing the exhaust gas; the upper two spraying layers are used for preventing ammonia escape; and the exhaust gas is discharged after being sprayed and absorbed by the primary absorption tower and the second absorption tower. The invention has the following advantages: 1) the purity of the by-product is high; 2) the twin tower design can not only obtain higher desulfurization efficiency, but also produce by-product with high purity; 3) the technology takes ammonium acid sulfite as the ultimate by-product, not only saving the technologies of crystallization and drying in the traditional technology, but also improving the additional value of the by-product; and 4) the technology in the invention can be recycled and has no secondary pollution.

A process for continuous production of ammonium thiosulphate, (NH4)2S2O3 (ATS) from NH3, H2S and SO2 comprising steps of: (a) partial condensation in a partial condenser 4 of a first gaseous or partial liquid feed stream comprising H2O, H2S and NH3 with a molar H2S:NH3 ratio <0.4; (b) passing the aqueous condensate comprising NH4HS and NH3 from the partial condenser 4 to a reactor 9 in which said condensate is contacted with a third feed gas stream 7 comprising H2S and with an aqueous solution 10 comprising NH4HSO3 and (NH4)2SO3 under formation of an aqueous solution of (NH4) 2S2O3; (c) passing the gas stream comprising NH3 and H2S from the partial condenser 4 to a mixing device 13 in which said gas stream is completely dissolved in the water drained off from the aerosol filter 25; (d) passing a second feed gas stream 20 comprising approximately 2/3 mole SO2 per mole of NH3 contained in the first feed stream to a SO2 absorber 21 and the aerosol filter 25; (e) passing the aqueous solution produced in mixing device 13 to the SO2 absorber 21; (f) passing the off gas from the absorber 21 to the aerosol filter 25 and (g) adding to the aerosol filter 25 a balance amount of water required for obtaining approximately 40-65 wt % (NH4)2S2O3 in the aqueous of solution of (NH4)2S2O3 being withdrawn from the reactor 9.

A dehalogenating agent is disclosed that is useful for treating aqueous media. The agent contains at least one sulfite salt, such as sodium sulfite. In the agent, the salt is in mixture with a lubricant, an excipient and a saccharide binder. Then a dry, blended mixture of the agent components is directly compressed to form tablets not only of desirable strength and hardness, but also of desirably controlled dissolution rate.

The present invention provides a new liquid fertilizer comprised of potassium sulfite and potassium bisulfite, with neutral to slightly alkaline pH, relatively lower salt index and potentially lower phytotoxicity damage compared to other sources of potassium and sulfur products applied in equal amounts as a starter fertilizer. More specifically, the present invention further relates to methods for fertilizing using a composition of potassium sulfite and potassium bisulfite, particularly as a starter fertilizer, in-furrow fertilizer, side dress fertilizer, and for foliar, broadcast, soil injection and fertigation applications. The fertilizer composition is comprised primarily of potassium sulfite (with the fertilizer grade of 0-0-23-8S).

The invention discloses a method for ammonia method desulfurization of flue gas and high-purity solid ammonium sulfite by-producing. The method comprises the following steps that: solid substances rich in sulfur are firstly burnt to generate the flue gas rich in high concentration sulfur dioxide gas; the flue gas enters into a cyclone separator for dedusting, and the dedusted flue gas enters into a heat exchanger for temperature reduction; then the flue gas enters into a washing and purifying tower to be washed; the flue gas respectively enters into a primary absorption tower, a secondary absorption tower and a third absorption tower for absorption, the high concentration ammonium bisulfite solution generated through reaction is taken out from a bottom groove of the primary absorption tower and is neutralized in a neutralization tank after volume and concentration measurement, and the solid ammonium sulfite is separated by a centrifuge in the neutralization tank through cooling crystallization; and the flue gas enters into a washing tower to be discharged after washing. By the method, SO2 and other harmful acidic gas are highly purified; the utilization ratio of an ammonia absorption agent is effectively improved; high-purity solid ammonium sulfite can be obtained; and the ammonium sulfite solution has excellent special industrial use and prospect.

The invention belongs to the technical field of flue gas desulfurization, and particularly relates to a flue gas desulfurizing device adopting an ammonia-ammonium sulfite method for recycling sulfur resources. The flue gas desulfurizing device comprises a desulfurization absorption system, an ammonium sulfite crystallization system, a process water system, an absorbent system and an emergency treatment system of the desulfurizing device, wherein the ammonium sulfite crystallization system, the process water system and the absorbent system are connected with the desulfurization absorption system. The flue gas desulfurizing device is characterized in that the main body of the desulfurization absorption system is an absorption tower having a double-tower structure or a single-tower double-section structure; a spray device is arranged in the tower; a collision type demister and a desulfurization tail gas purifying device are arranged in sequence above the spray device; an absorption liquid storing groove is formed at the bottom of the tower; the upper section of a single tower is connected with a circulating absorption liquid storing groove arranged outside the tower through a pipeline; and the ammonium sulfite crystallization system comprises a crystallizer provided with a jacket of cooling water. Due to the adoption of the flue gas desulfurizing device, the formation of an aerosol can be suppressed effectively, and secondary pollution is prevented; and compared with the conventional evaporative crystallization, the flue gas desulfurizing device has the advantage that a neutralizing condensation and crystallization way is adopted for ammonium sulfite serving as a side product, so that the energy consumption can be lowered.

The invention discloses a system of producing ammonium sulfite through flue gas desulfurization, which includes a column body and an out-column conversion system. A flue gas inlet is arranged on the lower section of the column body. A liquid storage section is arranged in the column body at the position corresponding to the lower section of the flue gas inlet. In the column body, a water-washing temperature-reducing section, a primary absorption section, a secondary absorption section, a purifying and water-washing section and a defogging section are arranged corresponding to the upper position of the flue gas inlet in a successively manner from the bottom to the top. An ammonium sulfite conversion system is arranged outside the column and includes an ammonia gas feeding system and a cyclic adjustment system. The system is smart and reasonable in structure design and solves the problem of high operation cost effectively. The system integrates both absorption and production so that the system is free of waste liquid emission and limits escape and emission of ammonia. A method of producing the ammonium sulfite through flue gas desulfurization is simple in process, is energy-saving and environment-protecting, is low in cost, is safe and stable in operations, can turn waste into resources, and is an important development direction of environment-friendly desulfurization.

The invention discloses a resourceful treatment method for soot from a copper melting furnace. The method comprises the following steps: separating lead-copper and tin-arsenic-zinc-antimony in soot byhigh-temperature alkaline cooking; introducing hydrogen sulfide into the obtained filtrate to precipitate tin-arsenic-antimony, then continuously introducing hydrogen sulfide to participate zinc, dissolving zinc participates by adding sulfuric acid, and performing concentration and crystallization to obtain industrial pure zinc sulfate; adding lead-copper to a hydrochloric acid solution, then adding sodium chlorate, and cooling the obtained solution to obtain lead chloride filtering residues and copper chloride filtrate; adding tin-arsenic-antimony filtering residues to hydrochloric acid fordissolution so as to obtain an antimony-containing solution, extracting the antimony-containing solution by adding an extraction agent, then performing reverse extraction with p ammonia water, performing concentration and crystallization on the obtained stripping solution to obtain antimony chloride, adding the obtained fifth filtering residues to a sodium sulfide solution for reaction, and then performing filtering so as to obtain tin-containing filtrate arsenic sulfide residues. By adopting the method provided by the invention, the separation and recovery of valuable metals in the soot are achieved, the recovery rate is high and the product finally obtained has high purity; and meanwhile, most of by-products thereof are recovered, the cost is low and the process is short.

The invention discloses a device for preparing sulfite. SO2-containing feed gas passes through a flue gas conditioning unit, then enters an acidic sulfite preparation unit and a basic sulfite slurry preparation and residual SO2 re-absorption unit in sequence, and is discharged out of the system; the synthesized intermediate slurry passes through an acidic sulfite conditioning and target product separating unit and a product drying unit in sequence, and finally a solid-phase target product or a liquid-phase target product is obtained. Ammonia in the feed gas can be fully recycled by the deviceand method, the ammonia consumption of a unit product can be reduced by 1/4-1/2, and the production cost of a target product is lower. The primary purity of the target product is high, secondary separation and purification are not needed, the loss in a purification step is avoided, and the yield of the target product can be increased by 0.8%-2.3% according to empirical analysis. The primary purityof the target product reaches 98.5-99.3%, one set of process equipment can be used for producing various products, and the market requirements can be better met.

The invention reveals an industrial tail gas full recycle apparatus. The apparatus comprises a reaction vessel; one end of a tail gas recovering pipe is connected with the reaction vessel, the tail gas recovering pipe is in a shape of an inverted U, a water pipe is arranged above the tail gas recovering pipe, and the other end of the tail gas recovering pipe extends into a solvent in a stainless steel enclosed pressure container; a pipeline connected with a vacuum pump is arranged in the stainless steel enclosed pressure container and is far away from the solvent in the stainless steel enclosed pressure container, and a condensation kettle communicated with the pipeline is arranged at the bottom of the stainless steel enclosed pressure container. The industrial tail gas full recycle apparatus converts exhaust gas into a variety of concentrates and enables the concentrates to be applied in other fields, which allows the effect of full recycle to be realized, thereby reducing waste of resources and increasing benefits for an enterprise; meanwhile, full recycle of tail gas enables tail gas not to enter into the air, thereby causing no pollution to the air and obtaining a good environmental protection effect.

The invention provides a desulfurization and denitrification system and method by adopting ozone oxidation in cooperation with an ammonia method. The desulfurization and denitrification system comprises a first absorption device and a second absorption device which are sequentially communicated in the flue gas flow direction. An ozone generation device is connected into an inlet flue of the firstabsorption device; the interior of the second absorption device is sequentially divided into a circulating spraying area and at least two layers of multi-effect spraying areas from bottom to top in the flue gas flowing direction, the circulating spraying area is externally connected with at least two absorbent storage tanks, the absorbent storage tanks are independently connected into the multi-effect spraying areas respectively, and the absorbent storage tanks supply absorbents to the circulating spraying area and the multi-effect spraying areas respectively; and the circulating spraying areais externally connected with a recovery unit. By adopting a double-tower structure for absorption, the retention time of the absorbent in the tower is prolonged, the contact time with flue gas is prolonged, and the desulfurization and denitrification efficiency is improved. A mixed absorbent of ammonia water and a calcium-based absorbent is adopted, and NOx in the flue gas is converted into chemical fertilizer and gypsum with higher additional value.

The invention provides a flue gas desulfurization and denitrification system device and a flue gas desulfurization and denitrification method adopting ozone oxidation in cooperation with multistage spraying. The desulfurization and denitrification system device comprises a mixing device, an oxidation absorption device and a spraying absorption device which are sequentially connected in the flowingdirection of flue gas, the interior of the oxidation absorption device is sequentially divided into an air inlet area, a spraying area, an oxidation area and an exhaust area which are communicated with one another in the air inlet direction, and an inclined spraying module is arranged on the inner wall, where the spraying area is located, of the shell; the mixing device is externally connected with an ozone generating device; and the ozone generating device is also connected to the shell where the oxidation zone of the oxidation absorption device is located. The desulfurization and denitrification method comprises the steps that flue gas and ozone are mixed and oxidized and then sequentially enter a spraying area and an oxidation area of the oxidation absorption device, the flue gas enters the spraying absorption device to be sprayed and absorbed again after being sprayed, absorbed and oxidized, and desulfurization and denitrification of the flue gas are completed. Ozone oxidation iscooperated with multi-stage inclined spraying, so that desulfurization and denitrification treatment can be effectively carried out on flue gas.