67 results about "Polyhalite" patented technology

Methods of forming potassium sulfate include calcining polyhalite ore particles to convert the polyhalite ore particles to a water-soluble composition. At least a portion of the water-soluble composition is dissolved in an aqueous medium to form an aqueous solution comprising K⁺, Mg²⁺, and SO₄²⁻ ions and a calcium-containing solid. The calcium-containing solid is separated from the aqueous solution to form a filtrate comprising K⁺, Mg²⁺, and SO₄²⁻ ions. A potassium-containing salt is dissolved in the filtrate to increase the concentration of K⁺ and SO₄²⁻ ions to from a concentrated liquor, and K₂SO₄ is crystallized from the concentrated liquor. A system for processing polyhalite ore includes a countercurrent leaching apparatus, a first mix tank, an evaporator, and at least one crystallizer.

The invention relates to a method for preparing water-soluble sylvite from a deep polyhalite seam in an in-situ reaction mode. The method for preparing the water-soluble sylvite from deep polyhalite in the in-situ reaction mode is characterized by comprising the following steps of: (1) preparing a reaction solution with certain concentration; (2) filling the reaction solution into the deep polyhalite seam, and enabling the reaction solution to contact with polyhalite; (3) standing and reacting, prompting the reaction solution to react with the polyhalite by using conditions of earth temperature and earth pressure, so as to generate water-soluble sylvite, and dissolving the water-soluble sylvite into a water solution so as to form a potassium-containing solution; (4) pulling out the potassium-containing solution from the seam; (5) filtering the potassium-containing solution and preparing the sylvite. By using the method, water-soluble sylvite is prepared from deep polyhalite in situ in large scale, the process is simple, the cost is low, the energy is saved and the environment is protected.

The invention relates to a process using polyhalite extraction mother liquor to produce potassium sulfate.The process includes the steps of firstly, feeding ammonia gas into the polyhalite polyhalite extraction mother liquor to regulate pH to 10.0-12.0 so as to obtain Mg(OH)2 slurry; secondly, feeding CO2 until the pH is 7.5-8.0 to obtain carbonized mother liquor; thirdly, performing pyrolysis and solid-liquid separation to obtain MgCO3.3H2O solid salt and mother liquor after pyrolysis and separation; fourthly, adding calcium oxide slurry or calcium hydroxide slurry into the mother liquor after pyrolysis and separation, heating, stirring, and performing solid-liquid separation to obtain mother liquor after causticization separation; fifthly, performing forcible evaporation, and crystalizing to separate out potassium sulfate.The K2O content of the potassium sulfate obtained by the process reaches up to 51.9%, potassium ion yield reaches up to 91.7%, byproducts such as high-purity magnesium oxide and gypsum can be coproduced, and the process is simple in process flow, simple in needed equipment, easy in industrial production and low in cost.

The invention discloses a polyhalite mining method which comprises the following step: injecting a leaching agent from an injection region of a saline well or a saline channel into an ore bed, wherein the leaching agent is contacted and leached with polyhalite in the ore bed to a predetermined time to obtain potassium-containing brine; and the leaching agent comprises a sodium chloride solution, the mass concentration of which is from 20% to saturation concentration. According to the method disclosed by the invention, by taking the sodium chloride solution obtained from a salt field process as the leaching agent, polyhalite which is deeply buried within 200m in a salt lake region is mined by virtue of a height difference between the injection region and the saline region. Compared with the mining method of the polyhalite in the prior art, the method not only is relatively low in mining cost, but also avoids collapse of the ore bed caused by detonation, fracture and improper leaching and the like.

A process for producing KNO3 from polyhalite is disclosed. In a preferred embodiment, the process comprises steps of (a) contacting polyhalite with HNO3; (b) adding Ca(OH)2 to the solution, thereby precipitating as CaSO4 at least part of the sulfate present in said solution; (c) precipitating as Mg(OH)2 at least part of the Mg2+ remaining in said solution by further addition of Ca(OH)2 to the remaining solution; (d) concentrating the solution, thereby precipitating as a sulfate compound at least part of the sulfate remaining in solution; (e) separating at least part of the NaCl from the solution remaining; and (f) crystallizing as solid KNO3 at least part of the K+ and NO3- contained in the solution. The process enables direct conversion of polyhalite to KNO3 of purity exceeding 98.5% and that is essentially free of magnesium and sulfate impurities.

The invention discloses a process for leaching dissoluble potassium from polyhalite. The process comprises the following steps of firstly, grinding ores: crushing polyhalite ores, and grinding the ores to be smaller than or equal to 80 meshes to obtain an ore ground product; secondly, roasting: roasting the ore ground product at the temperature of 350 to 500DEG C for 20 to 90 minutes to obtain a roasted product; thirdly, performing acid leaching: adding an acid solution into the roasted product according to the sold-liquid ratio of 1:0.8 to 10, and leaching at the temperature of 25 to 100DEG C for 20 to 120 minutes to obtain a polyhalite ore pulp; and fourthly, performing solid-liquid separation: performing solid-liquid separation on the polyhalite ore pulp to obtain a dissoluble potassium solution. The K<+> concentration in the obtained dissoluble potassium can reach as high as 8.10 weight percent; the dissoluble potassium solution can be repeatedly leached, so that the evaporation and concentration cost at later stage is reduced; the leaching rate of potassium can reach as high as 95.5 percent, and the leaching cycle is only 1 to 2 hours. The process disclosed by the invention is simple; raw materials of the leaching solution are wide in source and are low in cost; an obtained acid leaching mother solution can be recycled.

The invention discloses a crop universal base fertilizer containing secondary and minor elements and a preparation method thereof. The base fertilizer comprises the following raw materials in parts by weight: 18-24 parts of urea, 30-35 parts of monoammonium phosphate, 45-50 parts of polyhalite, 0.4-0.6 part of boric fertilizer and 0.8-1.0 part of zinc fertilizer. The boric fertilizer is sodium borate, and the zinc fertilizer is white vitriol. The preparation method comprises the following steps: carrying out physical crushing, screening and metering on the obtained raw materials, proportionally and thoroughly mixing in a stirrer to obtain a product, and carrying out metered packaging to obtain the finished product. The fertilizer contains the nitrogen, phosphorus and potassium, and also contains rich calcium, magnesium and other secondary and minor elements. When being used as a base fertilizer, the fertilizer can satisfy the demands for nutrients in the whole crop growth period, enhance the stress tolerance and immunity and increase the crop yield.

A technology for extracting potassium and removing sodium from high-sodium polyhalite ore includes the following steps that firstly, the high-sodium polyhalite ore is ground; secondly, flotation mother liquor returns to a closed technological process in the sequence of one-time roughing, two-time concentration, one-time scavenging, returning of middlings in concentration I and scavenged concentrate to roughing, and returning of middlings in the concentration II to concentration I, wherein 100-200 g/ton anionic collectors are added in the roughing process, flotation time ranges from 3 minutes to 5 minutes, 50-100 g/ton anionic collectors are added in the scavenging process, flotation time ranges from 2 minutes to 3 minutes, no collectors are added in the process of the two-time concentration, flotation time ranges from 3 minutes to 5 minutes, and flotation concentrate can be obtained; and thirdly, the flotation concentrate is washed and filtered, and low-sodium polyhalite is obtained. The technology is reasonable in process; the flotation technology is mature and reliable; the process and the reagent rule are simple; the technology is low in investment, easy to operate, low in energy and water consumption and low in comprehensive production cost; and large-scale industrial production can be achieved easily.

The invention discloses an analysis method for chloride ion content in polyhalite. The method comprises the following steps: dissolving a polyhalite test sample with acid; reacting chloride ions with mercuric thiocyanate in an acid medium to displace thiocyanate ions out; generating a red complex with iron III ions in ferric salt added into a solution; measuring the light absorption value of the complex in a test solution at the 460-nanometer position of a spectrophotometer in order to calculate the content of chloride ions in the polyhalite. For the content determination of chloride ions less than 1 percent in the polyhalite, the method is simple, convenient, reasonable, rapid and accurate; moreover, results are stable, and the precision is high.

The invention discloses a method of preparing a potassium-magnesium fertilizer. The method comprises the following steps of by taking polyhalite and potash feldspar as raw materials, crushing the rawmaterials into powder, then replenishing magnesium sulfate, and performing calcination, water immersion, filtering and evaporation to prepare the potassium-magnesium fertilizer. Compared with the prior art, the method has the advantages that, firstly, by adopting the polyhalite and the potash feldspar as raw materials, the raw materials are available, the cost is low, potassium-bearing minerals which widely exist in China are fully utilized to replace brine, and the technical problem of shortage of agricultural potassium resources in China is solved; secondly, by fully utilizing potassium andmagnesium elements in the raw materials and combining with external the magnesium sulfate for further replenishment of the magnesium elements, the produced potassium-magnesium fertilizer provides thepotassium and magnesium elements required for growth of crops and is good in fertilizer efficiency; and thirdly, the preparation method is simple and is low in production requirement and production cost and liable in popularization use.

The invention provides a method for exploitation and utilization of a polyhalite-halite accompanying mineral deposit. The method comprises the steps of injecting fresh water into the polyhalite-halite accompanying mineral deposit to leach out a brine stock solution of which the sodium ion concentration is more than 79g/L and the potassium ion concentration is more than 4g/L; enabling the brine stock solution to react with a lime emulsion, filtering and then adding a sodium carbonate solution to obtain purified brine; concentrating the purified brine by evaporating, and controlling the concentration of sulfate ions to be more than 20g/L to obtain crude sodium chloride and concentrated brine; freezing the concentrated brine to obtain coarse nitrate and a frozen nitrate stock solution; concentrating the frozen nitrate stock solution through vacuum evaporation, and controlling the potassium ion concentration to be more than 80g/L to obtain crude sodium chloride and a salt manufacturing stock solution; cooling the salt manufacturing stock solution to obtain crude potassium chloride and a separated potassium stock solution. The method provided by the invention is reasonable in process and ensures that the accompanying mineral deposit is subjected to maximized utilization. The method is simple in operation, low in cost and high in yield, and not only reduces the exploitation cost of polyhalite, but also realizes the comprehensive utilization of resources.

The invention discloses a method for preparing nitrogen, sulfur and potassium from polyhalite. The method comprises the following steps: crushing polyhalite ore powder and carrying out microwave-energy decomposition; subjecting the polyhalite ore powder having undergone microwave-energy decomposition to leaching with a hot solution and carrying out solid-liquid separation so as to obtain liquid-phase K2SO4, a MgSO4 solution and solid-phase CaSO4; subjecting K2SO4 and the MgSO4 solution to ammonia water precipitation so as to remove magnesium and carrying out filtering for separation so as to obtain solid Mg(OH)2 and liquid-phase K2SO4.(NH4)2SO4; calcining Mg(OH)2 at a temperature of 600 DEG C so as to obtain a MgO lightweight product; and subjecting liquid-phase K2SO4.(NH4)2SO4 to evaporative concentration and crystallization so as to obtain a K2SO4.(NH4)2SO4 product. Nitrogen-sulfur-potassium three-component fertilizer prepared in the invention has high fertilizer efficiency and good water solubility, can be rapidly absorbed by plants and is applicable to economic crops. The preparation method is simple in process flow, low in energy consumption, clean, environment friendly and low in production cost; and calcium, magnesium and potassium in polyhalite are overally recycled.

The invention provides a method for preparing potassium sulfate by using polyhalite. The method comprises the following steps of: (1) grinding ores: grinding the polyhalite till 90wt% of the polyhalite are over 150 meshes in size; (2) washing: washing with water to remove the sodium chloride in the polyhalite; (3) roasting: roasting washed minerals at a high temperature; (4) leaching: leaching to extract potassium in the polyhalite; (5) solid-liquid separation: subjecting the ore pulp obtained through the leaching step to solid-liquid separation so as to obtain a mother liquor containing K+; (6) conversion: evaporating the mother liquor, adding potassium chloride and a potassium mixed salt, preparing potassium sulfate through the conversion method, and filtering to obtain a potassium sulfate product and the mother liquor; (7) evaporation: continuously evaporating the mother liquor, filtering to obtain a potassium mixed salt, and returning the potassium mixed salt to the conversion process. According to the method, the potassium sulfate is prepared by using the polyhalite. The process is simple, wide in source of raw materials and low in cost, wherein the sodium chloride in the polyhalite can be effectively removed. Meanwhile, the leaching rate of K+ is high and the water consumption of leaching is reduced. The concentration of K+ in the leaching mother liquor is high, and the energy consumption of the subsequent evaporation and crystallization step is reduced. Obtained potassium sulfate products are high in purity.

The invention relates to a preparation method of a solid catalyst for ozone heterogeneous oxidation, which belongs to the technical fields of environmental protection and chemical catalysts. Medical stone, wollastonite, bentonite, polyhalite, magnesium spinel and peridotite are used as carriers, and after the carrier is expanded by lithium hypochlorite and bis(acetylacetonate) beryllium, the surfactant octadecyl chloride is added Trimethylammonium is activated under the action of ultrasonic waves, and then the activated carrier is mixed with the composite mineralizer borax and potassium sulfate in a hydrothermal reaction kettle, the precursor of the catalytic activity auxiliary agent scandium (III) isopropoxide, holmium oxalate decahydrate, Thulium(III) trifluoromethanesulfonate, lutetium carbonate hydrate, catalytic active center component precursor titanocene ring-substituted salicylic acid complex, L-aspartic acid molybdenum, dithiocyanatosilver(I) acid Potassium, diammine platinum dichloride, carry out hydrothermal reaction under the action of emulsifier N-hexadecyldimethyl-N'-trimethyl-propyl ammonium dichloride, dry to remove moisture, in muffle Ignition in a furnace to obtain a solid catalyst for ozone heterogeneous oxidation.

The present invention discloses a glass micro-bead for use in a PP reflection film and a method for preparing same. The glass micro-bead is prepared using the following raw materials based on part by weight: 24 to 42 parts of chabazite, 36 to 54 parts of silica fume, 18 to 36 parts of tridymite, 15 to 30 parts of illite, 22 to 44 parts of polyhalite, 26 to 48 parts of gibbsite, 45 to 60 parts of ceramic waste, 14 to 26 parts of sodium nitrate,12 to 16 parts of dipropylene glycol methyl ether acetat, 10 to 15 parts of ammonium polyacryloyldimethyl taurate, 3 to 6 parts of Jojoba acid polyoxypropylene ester, 4 to 8 parts of Acrylic ester of stearic acid ester, and 14 to 18 parts of additive. The glass micro-beads prepared according to the present invention have high qualification rate, good quality, stable properties, high inverse reflection coefficient, good reflection effect, excellent weather resistance, corrosion resistance and thermal resistance, good durability and wide application prospect.

The invention relates to the technical field of the salt chemical industry, in particular to a polyhalite leaching agent and an application thereof. The polyhalite leaching agent comprises oil field water and an acid chemical reagent. The volume ratio of the acid chemical reagent to the oil field water is 1:10-20. The oil field water is used as the leaching agent for leaching mining of polyhalite.The leaching agent can effectively leach the polyhalite. In the leaching process, the acid chemical reagent is added, and the leaching rate of K+ can be increased. Further, as the oil field water isadopted as the leaching agent, on one hand, the problem of a serious lack of fresh water resources required for leaching in polyhalite ore deposit areas is solved, and on the other hand, dual mining and utilization of oil field water and polyhalite is achieved, and the trouble of draining of oil fields is solved.

The invention relates to a preparation method of a solid catalyst for ozone heterogeneous oxidation, which belongs to the technical fields of environmental protection and chemical catalysts. Use medical stone, wollastonite, dolomite, calcite, bentonite and polyhalite as the carrier. After the carrier is expanded by lithium hypochlorite and bis(acetylacetonate) beryllium, add tetradecyltributylammonium chloride After ultrasonic activation treatment, the activated carrier is mixed with the composite mineralizer borax and potassium sulfate in a hydrothermal reaction kettle, and the precursor of the catalytic activity auxiliary agent scandium(III) isopropoxide, tri(4,4,4-trifluoro-1 ‑(2‑thiophene)‑1,3‑butanedione) europium, tris(6,6,7,7,8,8,8‑heptafluoro‑2,2‑dimethyl‑3,5‑octene Diketone) dysprosium(III), tris(trifluoromethanesulfonimide)ytterbium, catalytic active center component precursor titanocene ring-substituted salicylic acid complex, zinc lactate, ammonium zirconium carbonate, dichlorotetraammine Palladium, under the action of N-dodecyldimethyl-N'-trimethyl-2-hydroxypropyl ammonium chloride, carry out hydrothermal reaction, dry to remove moisture, and burn in a muffle furnace to obtain ozone Heterogeneous Oxidation Solid Catalysts.

The invention relates to a preparation method of an ozone heterogeneous oxidation solid catalyst, and belongs to the technical field of environmental protection and chemical catalysts. The preparation method includes the steps: taking attapulgite, diopside, bentonite, polyhalite, fly ash and coal gangue as carriers; broaching the carriers by lithium hypochlorite and beryllium bis(acetylacetonate); adding the surfactant trioctylmethylammonium chloride to perform activating under the action of ultrasonic wave; performing hydrothermal reaction on the carriers with composite mineralizing agents including borax and potassium sulfate, catalytic active aid precursors including praseodymium tri(3-trifluoroacetyl-D-camphor) (III), neodymium 1,1,1-trifluoroacetyl acetone, thulium trifluoromethanesulfonate (III) and lutetium carbonate hydrate, and catalytic active center precursors including ferrous fumarate, nickel citrate, zinc lactate and iridium dihydrate tetrachloride in a hydrothermal reactor under the action of the emulsifier, N-hexadecyldimethyl-N'-trimethyl-propyl ammonium dichloride; drying for removing water and firing in a muffle furnace to obtain the ozone heterogeneous oxidation solid catalyst.

The invention relates to a preparation method of an ozone heterogeneous oxidation solid catalyst and belongs to the technical field of environment protection and chemical catalysts. The preparation method includes: using medical stone, wollastonite, bentonite, polyhalite, fluorite and glauberite as the carriers, using lithium hypochlorite and bis(acetylacetone) beryllium to perform pore expansion on the carriers, adding surfactant chlorinated octadecyl trimethyl ammonium to activate the carriers under ultrasonic action, allowing the carriers to have hydrothermal reaction with compound mineralizer including borax and potassium sulfate, catalytic activity promoter precursors including scandium(III) isopropoxide, holmium oxalate decahydrate, tri[N, N-bis(trimethyl silane) amine] erbium and thulium(III) trifluoromethane sulfonate, and catalytic activity central precursors including titanocene ring substituted salicylic acid complex, L-aspartic acid molybdenum, K[Ag(SCN)2] and hexanitroso rhodium trisodium in a hydrothermal reaction kettle under the effect of an emulsifier tri(cetyl) methyl ammonium bromide, drying to remove moisture, and burning in a muffle furnace to obtain the ozone heterogeneous oxidation solid catalyst.

The invention relates to a preparation method of a solid catalyst for ozone heterogeneous oxidation, which belongs to the technical fields of environmental protection and chemical catalysts. The preparation method uses porous materials such as perlite, albite, bentonite, polyhalite, basalt and kabeinite as carriers, and after the carrier is modified by lithium hypochlorite and bis(acetylacetonate) beryllium to expand the pores, it is added to the surface The active agent nonylphenol-based diquaternary ammonium salt is subjected to surface activation treatment under the action of ultrasonic waves, and then the ultrasonic surface activation carrier is combined with the composite mineralizer borax and potassium sulfate in a hydrothermal reaction kettle, and the catalytic activity auxiliary agent precursor 1,1, Neodymium 1‑trifluoroacetylacetonate, tris(6,6,7,7,8,8,8‑heptafluoro‑2,2‑dimethyl‑3,5‑octenedione) dysprosium(III), tris [N,N‑bis(trimethylsilyl)amine]erbium, tris(trifluoromethanesulfonimide)ytterbium rare earth organometallic compound, catalytic active center component precursor common transition metal organocompound cobalt gluconate, citric acid Nickel and precious metal compounds potassium dithiocyanato silver (I) and palladium dichlorotetraammine are subjected to hydrothermal reaction under the action of emulsifier trimethylaminoethanol palmitate ammonium iodide, and the reaction product is dried to remove moisture , in a muffle furnace, burning at a certain temperature to obtain a solid catalyst for ozone heterogeneous oxidation.

The invention relates to a preparation method for a solid catalyst for ozone heterogeneous oxidization and belongs to the technical field of an environment-friendly and chemical catalyst. The preparation method comprises the following steps: taking gamma-aluminum oxide, barite, activated carbon, carnallite, bentonite and polyhalite as a carrier; modifying the carrier by broaching with lithium hypochlorite and bis(acetylacetone) beryllium, and then adding surfactant bidecalkyl dimethyl ammonium chloride and performing surface activating treatment under the effect of ultrasonic wave; performing hydrothermal reaction on the carrier, a compound mineralizer including borax and potassium sulphate, catalytic activated assistant precursors, including 4(2, 2, 6, 6, 6-tetramethyl-3, 5-heptanedione) cerium (IV), 1,1,1-trifluoroacetylacetone neodymium, tricyclopentadiene promethium and tri(4,4,4-trifluoro-1-(2-thiophene)-1,3-butanedione) europium and catalytic active core component precursors, including manganese lysine, cupric glutamate and potassium dicyanoargentate and dichlorodiamminoplatinum in a hydrothermal reaction kettle under the effect of chlorinated methyl acryloyl ethyltrimethylammonium chloride used as an emulsifier; drying and dewatering the reaction product; burning in a muffle furnace under a certain temperature, thereby acquiring the solid catalyst for ozone heterogeneous oxidization.

The invention relates to a preparation method of an ozone heterogeneous oxidized solid catalyst, and belongs to the technical field of environmental protection and chemical catalyst. The preparation method comprises the following steps: taking maifanite, wollastonite, bentonite, polyhalite, hydrotalcite and alunite as carriers, performing lithium hypochlorite and bis(acetylacetonato) beryllium reaming, adding octadecyl trimethyl ammonium chloride to perform activating treatment under an ultrasonic effect; and then enabling the active carriers to perform hydrothermal reaction with the compound mineralizing agent borax and potassium sulfate, catalytic active promoter precursors scandium isopropoxide (III), holmium oxalate decahydrate, erbium tris[bis(trimethylsilyl)amide], lutetium carbonate hydrate, catalytic active center precursors titanocene ring substituted salicylic complex, L-aspartic acid molybdenum, potassium dithiocyanatesilver (I), dipotassium hexachloroosmium under the effect of the emulsifier N-dodecyl dimethyl-N'-dodecyl-dimethyl-2-hydroxypropyl ammonium dichloride, drying to remove the moisture, firing in a muffle furnace to obtain the ozone heterogeneous oxidized solid catalyst.