61results about "Manganese nitrates" patented technology

The invention relates to a method for preparing a hydrogenation catalyst which can change the property of the surface of IIB group metallic oxide. The invention adds the zinc via immersion method, and the carrier is avoided high temperature sintering process after the immersion with zinc solution and dried, and before loading the hydrogenation active metal. Compared to present technique, the invention avoids the high temperature process after adding zinc element and before adding hydrogenation metal, to decrease the reciprocity between the zinc and carrier, which avails the regulation on the reciprocity between hydrogenation metal and carrier. In addition, the inventive method has simple process, lower power consumption, easy operation and lower producing cost. The invention can be used in the reaction of hydrogenation refining, and hydrogenation cracking of hydrocarbon, which has higher activity and selectivity than present catalyst.

The invention discloses a method for synthesizing calcite-rhodochrosite mixed crystal solid solution by a precipitation method. The method comprises the steps of obtaining calcite-rhodochrosite mixedcrystal solid solution with high crystallinity and good stability by using an ammonium bicarbonate preparation solution as a base solution and then adding anhydrous calcium nitrate and manganous nitrate in different molar ratios into the ammonium bicarbonate solution. Finally, a proper quantity of calcite-rhodochrosite solid solution is dissolved in three different solutions at the temperature of25 DEG C, and the rules of migration, transformation and enrichment of manganese in the environment are mastered. Compared with calcite-rhodochrosite synthesized through a traditional precipitation method, the calcite-rhodochrosite series solid solution synthesized through the method has the advantages of being low in cost, easy to control, capable of achieving long-term stable storage of manganese in the environment and the like.

The invention discloses a preparation method of water-based Fe3O4 magnetic fluid, which relates to a preparation method of water-based nano magnetic fluid with superparamagnetism. The invention solves the problem that the current magnetic fluid contains organic matter and has poor organism compatibility. The steps of the invention are that: FeCl3 and FeCl2 are dissolved in deionized water and pH value is adjusted; the mixture is heated in oil bathe at the temperature of 120-180 DEG C, NaOH is dripped in under the protection of inert gas and the mixture is insulated and mixed for 0.5-2.5h; deionized water cleaning and ultrasonic dispersion are carried out, permanent magnet is put into the solution to ensure the solution does not contain chloride and is neutral; the solution is subject to centrifugation after being dispersed by ultrasound; the solution is stirred, concentrated and refluxed at the speed of 300r/min for 3-6h at the temperature of 100-160 DEG C and under the protection of inert gas. The viscosity of the water-based Fe3O4 magnetic fluid prepared by the invention is less than 10mpa.s, particle size is between 3 and 10nm, saturation magnetization is more than 60emu/g and the water-based Fe3O4 magnetic fluid has superparamagnetism, good stability and water solubility, and the material is non-toxic and cheap. The method is simple, easy and suitable for industrial production.

Methods and systems for regenerating and pretreating oxides of manganese and precipitation of oxides of manganese from manganese salt solutions. Oxides of manganese, a slurry containing oxides of manganese or manganese salt solutions are mixed with heated aqueous oxidizing solutions and processed in a continuous process reactor. Temperature, pressure, Eh value, and pH value of the mixed solution are monitored and adjusted so as to maintain solution conditions within the MnO₂ stability area during processing. This results in regenerated, pretreated and precipitated oxides of manganese having high or increased pollutant loading capacities and/or oxidation states. Oxides of manganese thus produced are, amongst other uses; suitable for use as a sorbent for capturing or removing target pollutants from industrial gas streams. Filtrate process streams containing useful and recoverable value present as spectator ions may be further processed to produce useful and marketable by-products.

The invention provides an oxidizing method for nitrite ions in desulfurization and denitrification waste liquid. The oxidizing method comprises the following steps of firstly carrying out solid-liquidseparation and deep dedusting on the desulfurization and denitrification waste liquid, then adjusting the pH value of the solution to be in the suitable range for oxidation treatment, completely oxidizing nitrites in the waste liquid into nitrates through a manner of combining an oxidizing agent and ultraviolet light to produce free radical, and finally obtaining a nitrate product. The oxidizingmethod provided by the invention has the beneficial effects that the operation is simple and convenient, the cost is low, the oxidizing efficiency is high, the problem of secondary pollution easily caused by the nitrite waste liquid is solved, and the recycling of all nitrogen elements in the waste liquid is realized, so that the application prospect is good.

The invention relates to a preparation method of electronic grade manganous nitrate for a tantalum capacitor, which includes a. adding crushed and washed manganese metal into nitric acid, stirring the mixture while adding the manganese metal till the manganese metal is completely dissolved and then statically placing the mixture for 10 to 40 minutes; b. conducting coarse filtering on the solution, adjusting the pH value of the solution to be 2 to 4 through nitric acid; and c. heating the solution receiving acid adjustment in vacuum mode to condense the solution to the required ratio, adjusting the pH value of the solution through nitric acid to be 2-5, cooling the solution and conducting fine filtering on the solution to obtain a manganous nitrate solution product. The preparation method can be used for preparing liquid manganous nitrate products in batch in industrial mode to achieve using standard of electronic grade products for the tantalum capacitor. Manganese dioxide produced by the electronic grade manganous nitrate is high in purity, good in crystal structure, good in chemical activity, even and compact in layer, small in particle, firm in adhesion, small in resistivity, low in using unit consumption and low in content of chemical impurities such as iron, calcium, lead, potassium and magnesium, thereby being suitable for serving as high-purity catalyst, oxidant, adsorbent and the like.

The invention provides a high-purity manganous nitrate and a preparation method thereof. The method comprises the following steps: (1) sulfuration, adding the mixed gas containing ammonia gas and hydrogen sulfide into a manganese sulfate solution of 150-300g/L to conduct a sulfuration reaction until the concentration of Mn<2+> in the solution is less than 500ppm, then stopping the reaction, conducting solid-liquid separation, and then washing an obtained manganese sulfate filter cake for later use; (2) acidification, adding nitric acid into the manganese sulfate filter cake obtained in the sulfuration step (1) at the nitrogen atmosphere, keeping the temperature of a reaction system to be less than 50 DEG C, and using hydrogen sulfide produced in a nitrogen displacement reaction in the reaction process; stirring, reacting until the pH value is 3.5-4.0, stopping adding acid, then conducting solid-liquid separation, and the obtained filtrate is a manganous nitrate product. The preparation method adopts a manganese sulfide-nitric acid process route to obtain the high-purity manganous nitrate product with low content of heavy metals, and the process cost is lowered.

The embodiment of the invention discloses a preparing method for a manganese nitrate solution. The method comprises the following steps: mixing a nitrate solution and a hydrogen peroxide solution to obtain a double-component oxidizing solution; reacting after mixing the metallic manganese with the double-component oxidizing solution to obtain the manganese nitrate solution. According to the invention, after the double-component oxidizing solution is obtained through mixing the nitrate solution and the hydrogen peroxide solution, the manganese nitrate solution is obtained through the reaction of the obtained double-component oxidized solution with the metallic manganese. Compared with the method in the prior art that the manganese nitrate solution is obtained through the direct reaction of a nitrate solution with the metallic manganese, the preparing method provided by the utility model has the advantages that the reaction rate of the preparing method is obviously improved; besides, as reaction can be carried out by adopting nitrate with relatively lower concentration, and the production cost is reduced.

The invention belongs to the technical field of the treatment and the utilization of chemical three wastes, in particular to a method for generating high-purity manganese nitrate and co-generating gypsum by using waste sulfuric acid treated by rhodochrosite. The invention has the main technical scheme that the method comprises the following steps of: treating waste sulfuric acid generated by producing titanium pigmen by fully utilizing the rhodochrosite; crushing the rhodochrosite and extracting manganese contained in the rhodochrosite with hydrochloric acid; making an extracting liquid react with the waste sulfuric acid generated by producing the titanium pigment; and carrying out comprehensive reaction by using nitric acid. On the one hand, the wastes are changed into the valuables and the waste sulfuric acid is converted into manganese nitrate with high economic value while the pollution to the environment is treated; and on the other hand, the gypsum is co-generated while the manganese nitrate is produced. The invention has the advantages of low production cost, high profit, high market demand and simple process and production equipment; and the method is a comparatively practical treatment and utilization method; and the considerable economic values can be created, chemical waste residues are eliminated and the pollution to the environment is governed.

The invention discloses a method for producing high-purity manganese nitrate. The method comprises the following steps: step 1, carrying out a synthetic reaction in a quartz glass device by taking industrial nitric acid and electrolytic manganese metal as raw materials; step 2, adding a proper amount of an amino-carboxyl chelating agent into the synthetic reaction solution, continuously stirring,and then standing and precipitating; step 3, filtering the solution, concentrating, cooling and crystallizing; and step 4, after the crystallization is completed, carrying out dehydration treatment toobtain primary crystals, and carrying out recrystallization treatment on the primary crystals to obtain the product. Metal ion impurities in the product are removed by using the amino-carboxyl chelating agent; the content of metal impurities in the manganese nitrate product meets the high-standard requirements of customers, and meanwhile, the influence of the aminocarboxylic chelating agent serving as an impurity can be completely ignored due to the extremely small addition amount of the amino-carboxyl chelating agent, so that the technical defect that high-purity manganese nitrate cannot beproduced at low cost in the prior art is overcome.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and reed powder into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention relates to a method for reducing molybdenum impurity in manganese nitrate by an organic solvent extraction process. The method comprises the following steps: heating unqualified manganese nitrate by using tetrachloroethylene, performing refluxing for dissolving to prepare a tetrachloroethylene solution of manganese nitrate, naturally filtering the obtained solution by a filter paper,recovering the tetrachloroethylene solvent, for cycle use, by using a distillation device, and carrying out cooling crystallization on residues obtained after the distillation in order to obtain qualified manganese nitrate. The manganese nitrate and molybdenum nitrate have different solubilities in tetrachloroethylene, so the manganese nitrate and molybdenum nitrate are conveniently separated byusing the tetrachloroethylene as the solvent, thereby the method has the advantages of simple process, easiness in operation, stable product quality, recycling of the solvent tetrachloroethylene, andresource saving; the method also has the advantages of no discharge of a waste liquid in the preparation process, small consumption of the raw material, great reduction of the production cost, high economic benefit and friendliness to the environment; and the manganese nitrate obtained by the method is an analytically pure reagent, and can be widely used in fields of electronics, chemicals, electroplating and catalyst manufacturing.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder with the particle size being not greater than 180 meshes and high-concentration organic wastewater which does not contain benzene-ring substances into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and napier grass powder into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

The invention provides a method for preparing manganese sulfate, manganese nitrate and calcium sulfate, and the method comprises: grinding manganosite into coarse powder, soaking the coarse powder in a waste liquid generated in titanium white production utilizing a sulfuric acid method at the temperature of 60-80 DEG C for 8-10 hours, carrying out suction-filtering to obtain a clarified filtrate, and adding manganese hydroxide to remove impurities and obtain a pure manganese sulfate solution; distilling the pure manganese sulfate solution while decompressing to obtain a manganese sulfate saturated solution, cooling and precipitating manganese sulfate crystals containing crystal water, then drying and crushing to obtain a manganese sulfate crystal product; reacting the pure manganese sulfate solution with a calcium nitrate solution under stirring, filtering the reaction product to obtain a calcium sulfate filter cake and a manganese nitrate filtrate, distilling the manganese nitrate filtrate while decompressing to obtain a manganese nitrate supersaturated solution, cooling and crystallizing to obtain manganese nitrate crystals, drying and crushing to obtain a manganese nitrate powder product; and washing the calcium sulfate filter cake, drying and crushing to obtain a calcium sulfate dihydrate product.

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder and rice straw powder into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.