45 results about "Sulphur product" patented technology

The invention discloses a process for recovering sulfur, lead, zinc and silver from oxygen-enriched directly leached residues of zinc concentrates or lead-zinc mixed ores, which comprises the following steps: adding the oxygen-enriched directly leached residues of zinc concentrates or lead-zinc mixed ores, which are not processed or subjected to drying, grinding and screening pretreatment, into a heating device in which mixed liquid of a sulfur extracting agent and an additive metered in a liquid-solid ratio of 8-15 is filled, after heating for reaction, filtering the obtained object while the obtained object is hot, and cooling and then filtering filter liquor so as to obtain a sulphur product; after filter residues are washed by using a sulfur extracting agent and ethanol, returning the obtained product to a lead system to recover lead and silver; after washing liquid is volatilized, cooled and recovered, returning the obtained object to use; after the sulfur extracting agent is filtered, regenerating, and returning the obtained object to a sulfur extracting process so as to cyclically participate in the reaction; and after a zinc-containing solution is filtered, returning the obtained product to a direct leaching system. The process is simple in process and equipment and high in sulfur recovery rate and product quality, has no pollution to the environment, both can realize the efficient and economic extraction of sulfur in floating sulfur residues, and can realize the respective efficient and economic recovery of zinc, lead and silver in floating sulfur residues.

The invention discloses an integrated method for wet-process desulfurization, denitrification demercuration and dearsenification of complexing ferroporphyrin smoke based on supergravity. The method comprises the following steps of firstly, absorbing SOx by utilizing inorganic sulfide, desulfurating, meanwhile, reacting inorganic sulfide with toxic heavy metals such as mercury and arsenic in the smoke so as to generate an insoluble vulcanized salt; utilizing a complexing ferroporphyrin to absorbing NOx by utilizing complexing ferroporphyrin for denitration; and regenerating ab absorber by utilizing inorganic sulfide as a reducing agent. The method provided by the invention has the advantages that a supergravity machine is adopted as gas-liquid mass transfer strengthening equipment, the method is beneficial to removal of toxicants such as SOx, NOx, mercury and arsenic, the regeneration efficiency of the absorbent is high, an absorption liquid is applied in a circulating manner, a reducing agent inorganic sulfide is oxidized so as to generate sulphur which can be recovered, sulphur is processed into a high quality sulphur product, and the secondary pollution is not generated; the process is simple, the absorption efficiency is high, the dust is thoroughly removed, the desulfurization degree is more than 99%, the denitration rate is more than 96%, and mercury and arsenic in the smoke are fully basically removed.

The invention pertains to a process for deep desulphurization of low sulphur content feedstock comprising the steps of providing a low sulphur content hydrocarbon feedstock and contacting said hydrocarbon feedstock with a cobalt-molybdenum desulphurizing system or a nickel-molybdenum desulphurizing system in an oxide form in order to obtain a very low sulphur product comprising less than 5 ppm by weight sulphur.

The invention discloses a high stability sulphur product and a production process thereof, and belongs to the technical field of sulfur production. The production process of high stability sulfur adopts a gasification-quenching method to produce insoluble sulfur, and comprises the procedures of raw material gasification, quenching treatment, tablet washing, drying, smashing and sieving, and finished product oil charging, wherein during second-time drying treatment, a product obtained after extracting and a special stabilizer are mixed and dried together, and the addition amount of the stabilizer accounts for 2-3 percent of the mass of an obtained insoluble sulfur product. The stabilizer of a special type is added in a sulfur production process, and the sulfur production process is optimized, so that the heat stability of the obtained insoluble sulfur can be effectively improved.

The invention relates to a production method of insoluble sulfur. The production steps are composed of a series of production processes of melting sulfur, gasification, quenching, washing, drying, post-treatment, distillation and condensation. It is characterized in that a horizontal rotary reactor is used The processes of quenching, washing and drying are carried out; the production method of the present invention has the advantages of high production efficiency, high purity of produced products, complete recycling of materials, no discharge of toxic substances, etc., and is suitable for large-scale industrial production of insoluble sulfur products for radial tires.

The invention discloses a method for oxygen pressure leaching of bismuth sulfide concentrate in methanesulfonic acid system, comprising the following steps: S1, material pretreatment: adding bismuth sulfide concentrate into a vertical mill, and using the vertical mill to sulfide The bismuth concentrate is finely ground, and then the screened material is dried for later use; S2, liquid preparation: according to the iron-containing phase and iron content in the material, appropriately add iron powder to the methanesulfonic acid solution, and then stir the solution , so that iron powder and methanesulfonic acid solution are fully mixed to obtain iron-containing methanesulfonic acid leaching agent. The present invention replaces the traditional oxidation-reduction roasting fire process by adopting oxygen pressure leaching technology, extracts bismuth efficiently, and also avoids the generation of low-concentration sulfur dioxide from the root. High yield, up to more than 93%, and simple process, the method is simple to operate, can efficiently dissolve bismuth, obtain sulfur products, and does not produce SO 2 , has the advantage of environmental protection.

A method for desulfurization by reaction of hydrogen sulfide and sulfur dioxide. Hydrogen sulfide and sulfur dioxide are reacted in a solution, the solution includes water and at least one organic basic compound soluble in water, and the initial pH value of the solution is ≥7.2. The mass fraction of the organic basic compound in the solution is 0.1% to 30%; in the above method, the selected organic basic compound is a compound with a solubility in water ≥ 0.1g / 100g water, preferably a solubility ≥ 1g / 100g water. The above reaction can be carried out at normal temperature and pressure, and the addition of organic basic compounds makes H 2 S and SO 2 The reaction time is greatly shortened, indicating that the dissolution rates of the two in water tend to be similar, so that the reaction is more likely to occur, and the sulfur product obtained by the reaction is high in purity, only liquid-solid separation is required without refining. The required reaction conditions of the method of the invention are mild, the equipment is simple and easy to process, the investment is low, and the operation is safe.

The invention relates to a comprehensive utilization method of zinc concentrate high-pressure oxygen leaching sulfur residue, which belongs to the field of comprehensive utilization of industrial waste residue in the metallurgical industry. The method of the present invention is to add the sulfur residue into the leaching tank containing water and carbon disulfide, the water acts as a seal to prevent the volatilization of carbon disulfide during the leaching process, and after stirring and reacting, vacuum filtration and distillation are performed to obtain high-quality sulfur products, and the filter residue is washed, After drying, the enriched slag enriched with zinc and mercury is obtained; the sulfur product obtained by the above method contains more than 99.5% sulfur, Hg is less than 0.02mg / kg, the Zn content in the enriched slag reaches about 25%, Ag1600g / t is above, Hg0. About 5%; this technology can not only make full use of industrial waste sulfur slag, develop a new application way for the utilization of sulfur slag, turn waste into treasure, but also reduce the environmental protection pressure of smelters, reduce environmental pollution, and improve economic benefits of enterprises .

The invention discloses a wet circulating desulfurization process for high-sulfur anode slime. The wet circulating desulfurization process comprises the following steps: step 1, adding a dehydrating agent into the high-sulfur anode slime in a mixing dryer; 2, the dehydrated and dried high-sulfur anode slime is transferred into a reaction kettle, and a solvent is added into the reaction kettle through a solvent tank; step 3, transferring a product in the step 2 into a first filter, transferring a liquid phase filtered by the first filter into a crystallization kettle for cooling crystallization, cooling a crystallized product to room temperature, transferring the crystallized product into a second filter for filtering, and transferring a slag phase filtered by the first filter into a slag warehouse; and 4, conveying a liquid phase filtered by the second filter to a solvent tank for recycling, and conveying a slag phase filtered by the second filter to a sulfur product warehouse, wherein the slag phase is elemental sulfur. The method has the advantages of reasonable process flow, simplicity in operation, high desulfurization effect and high recycling rate.

The invention discloses a production method of high-grade insoluble sulfur and a stabilizer for production of the high-grade insoluble sulfur, and belongs to the technical field of sulfur production.The stabilizer for production of the high-grade insoluble sulfur is prepared from ammonium persulfate, sodium ethyl xanthate and iodine; the production method of the insoluble sulfur adopts a gasification-quenching method to produce the insoluble sulfur, and comprises the procedures of raw material gasification, quenching treatment, tablet washing, drying, smashing and sieving, wherein during drying treatment, a product obtained after tablet washing and the stabilizer are mixed and dried together, and the addition amount of the stabilizer accounts for 2-3 percent of the mass of an obtained insoluble sulfur product. The stabilizer of a special type is added in a sulfur production process, and a sulfur production technology is optimized, so that the heat stability of the obtained insoluble sulfur can be effectively improved.

The invention relates to a method for preparing high-purity sulfur from tail gas containing hydrogen sulfide. The method comprises the following step: carrying out contact reaction on the tail gas containing hydrogen sulfide and sulfuric acid through a contact device to obtain sulfur with the purity of more than or equal to 99.95%. The molar ratio of the sulfuric acid to the hydrogen sulfide is (0.1-1): 1; the concentration of the sulfuric acid is greater than or equal to 75%; and the high-purity superfine sulfur is obtained by controlling gas-liquid two-phase related parameters in the reaction process. The method is high in absorption reaction efficiency, mild in reaction process, free of secondary pollution and high in applicability. The purity of the sulfur product is greater than or equal to 99.5%, the particle size range is 10-30 [mu]m, and the sulfur product can be directly applied to industries such as medicine, agriculture and chemical engineering; and the treated absorption liquid can be directly sold or used as a by-product.

The invention provides a production process for preparing sulfur by recovering sulfur dioxide from flue gas. The production process comprises the following specific steps of: (A) carrying out desulfurization on the flue gas by sodium carbonate or sodium bicarbonate solution in an absorbing tower, concentrating and crystallizing absorbing solution after reacting with the flue gas, and separating out solid sodium salt; (B) feeding the solid sodium salt into a reducer, and under the action of a reducing agent, reducing the solid sodium salt into sodium sulfide; carrying out chilling, dissolving, filtering and washing on molten mixture from the reducer to obtain clean liquid which is aqueous solution of sodium sulfide; recovering the heat of gas with rich CO2 discharged by the reducer by a waste heat boiler to generate steam, and feeding the steam to next step for treatment; and (C) adding sodium bicarbonate into the aqueous solution of sodium sulfide obtained in the step (B), feeding H2S obtained by reaction into a claus furnace, and manufacturing a sulfur product; and feeding sodium carbonate solution obtained by reaction to react with the rich CO2 in the step (B), and obtaining sodium bicarbonate which can be recycled.

The invention discloses a method for recovering sulfur and silver from zinc-oxygen pressure leaching slag, which belongs to the technical field of non-ferrous metal recovery. The method includes: (1) preliminary dehydration treatment; (2) adding flocculant for rough selection; (3) adding flocculant to Add a dispersant to the roughing concentrate for three-stage beneficiation; (4) sweep the roughing tailings for three stages; (5) combine the beneficiation I, II, and III tailings for middling treatment, and middling The rough concentrate and selected concentrate are combined into sulfur concentrate, and the tailings are silver-rich slag. The present invention aims at the problem that the sulfur particles are small and the precious metal Ag cannot be effectively recovered in the zinc oxygen pressure leaching process, and polyacrylamide is added as a flocculant to realize carrier flotation, and at the same time, the viscosity of the zinc oxygen pressure leaching slag solution containing iron is solved High problem, improve the recovery rate of sulfur and precious metal Ag. By adding a dispersant in the flotation process and carrying out microwave treatment, the dispersion of sulfur after flocculation is realized, the problem of difficult separation of sulfur and precious metals is solved, and the grade of sulfur products is improved.

The invention provides a beneficiation method for separating ores from sulphur in wet-method zinc smelting slag. The beneficiation method includes firstly, realizing fine grinding of the wet-method zinc smelting slag while adding dispersing agent and realizing separation and dispersing of the sulphur and the zinc sulfide ores; secondly, utilizing combined suppressant to suppress the zinc sulfide ores in leaching slag in a floatation process after the leaching slag is ground, realizing floatation separation of the zinc sulfide ores and the sulphur via once roughing, twice scavenging and four times of concentration under the condition of adding a small quantity of foaming agent, and obtaining high-quality sulphur products and zinc concentrate capable of returning to a wet-method zinc smelting process; and thirdly, leading ores in first concentration, second concentration and first scavenging to return to roughing in a centralized manner and leading ores in third concentration and fourth concentration to return to the first concentration in a centralized manner in a floatation technical process. The beneficiation method effectively realizes separation of the sulphur and the zinc sulfide ores in the zinc sulfide concentrate wet-method leaching slag, the quality of the sulphur products is improved, zinc elements are recycled effectively, and comprehensive utilization rate of the wet-method zinc smelting process is improved.