195results about "Alkali metal nitrates" patented technology

Methods for assembly of monolayers of nanoparticles using the Langmuir-Blodgett technique, as well as monolayers, assemblies, and devices are described. The surface properties of these monolayers are highly reproducible and well-defined as compared to other systems. These monolayers can readily be used for molecular detection in either an air-borne or a solution environment, and sensors using the monolayer could have significant implications in chemical and biological warfare detection, national and global security, as well as in medical detection applications.

Salt composition containing an amount of at least 10% by weight KNO₂, an amount of at least 15% by weight NaNO₂, and an amount of at least 10% by weight LiNO₃. Salt aqueous liquid solution containing the salt composition. Use of a salt composition or salt aqueous liquid solution for storing and/or transferring thermal energy.

A process for the removal of pollutants from a combustion process and, more particularly, a process for removing pollutants such as carbon dioxide, mercury, sulphur dioxide, nitrogen compounds and oxygen compounds from a combustion process. The process includes the removal of pollutants from a combustion process that produces an emission comprising: cooling the emission to a temperature of about 200° C.; removing nitrogen, water and oxygen from the emission to produce a gas containing a concentration of pollutants; contacting the gas with an aqueous magnesium chloride solution, wherein a slurry mixture is formed; and cooling the gas and the slurry mixture, wherein hydrochloric acid vapour and a sludge are formed.

Disclosed is a clean method for preparing layered double hydroxides (LDHs), in which hydroxides of different metals are used as starting materials for production of LDHs by atom-economical reactions. The atom efficiency of the reaction is 100% in each case because all the atoms of the reactants are converted into the target product since only M²⁺(OH)₂, M³⁺(OH)₃, and CO₂ or H_nAⁿ⁻ are used, without any NaOH or other materials. Since there is no by-product, filtration or washing process is unnecessary. The consequent reduction in water consumption is also beneficial to the environment.

The present invention provides a method for advantageously producing an iron oxyhydroxide exhibiting excellent capability of adsorbing harmful substances, such as a phosphrous components and endocrine disrupting chemicals, which are contained in industrial wastewater, exhaust gases, etc., and an adsorbent material comprising the iron oxyhydroxide produced by the method as a main component. Specifically, the present invention provides an adsorbent material produced by a method comprising the steps of:

• • (a) adding a base to an aqueous iron ion-containing solution, adjusting the pH of the resultant mixture to 9 or less, to form a precipitate that contains an iron oxyhydroxide;
  • (b) drying the precipitate at a temperature of 100° C. or lower to obtain an iron oxyhydroxide;
  • (c) contacting the resultant iron oxyhydroxide with water; and
  • (d) subjecting the resultant iron oxyhydroxide to a heat treatment under a gas atmosphere having an inert gas concentration of 80% or greater at a temperature of 100 to 280° C.

Disclosed is an aqueous solution of a chromium salt, in which the oxalic acid content is 8% by weight or less relative to chromium. In the aqueous solution of the chromium salt, the total organic carbon content is 4% by weight or less relative to chromium. The chromium salt is preferably a chromium chloride, a chromium phosphate, or a chromium nitrate. The chromium chloride preferably contains a basic chromium chloride represented by the composition formula Cr(OH)_xCl_y (wherein 0<x≦2, 1≦y<3, and x+y=3). The chromium phosphate is preferably one represented by the composition formula Cr(H_3−3/nPO₄)_n (wherein n is a number satisfying 2≦n≦3). The chromium nitrate is preferably a basic chromium nitrate represented by the composition formula Cr(OH)_x(NO₃)_y (wherein 0<x≦2, 1≦y<3, and x+y=3).

The invention relates to a resource treatment method for a lithium-rich aluminum electrolyte. The method comprises the following steps: firstly performing heat treatment on the lithium-rich aluminum electrolyte to obtain a product A; performing leaching treatment on the roasting product A with a water-soluble inorganic salt as a leaching agent in water, and performing filtering to obtain a filter residue B and a filtrate B; adding an alkali or an aqueous solution of the alkali to the filtrate B to remove aluminum ions in the filtrate B to obtain a filtrate C; and adding a water-soluble carbonate or an aqueous solution of the carbonate to the filtrate C to make lithium ions in the filtrate C be converted into lithium carbonate precipitation, and then performing filtering to obtain lithium carbonate and a filtrate D. The technical problem perplexing aluminum electrolysis industry of rich and high content lithium in an excess aluminum electrolyte and inefficient utilization of valuable metals is solved, the economic benefit is improved, and stable production of an electrolytic aluminum enterprise is promoted.

A process is presented for the production of ammonium sulfate nitrate. The process provides for producing a highly uniform product and having a substantially uniform size. The process includes reacting ammonium sulfate and ammonium nitrate to form an FASN slurry melt. The slurry melt is continuously stirred and heated to keep the slurry melt under a shear thinned condition and at a uniform temperature until the slurry melt is extruded, cooled and solidified.

The invention relates to the technical field of zero-emission sewage reutilization and provides a zero-emission sewage reutilization device. A zero-emission sewage reutilization method sequentially comprises steps as follows: miscellaneous salt is subjected to coagulative sedimentation, sodium carbonate is added and calcium carbonate precipitates are obtained; caustic soda is added, and magnesium hydroxide is obtained; membrane filtration is performed, the pH value is regulated, ion exchange softening, advanced oxidation, biochemical treatment with a biological membrane are performed, filtration with a membrane filter and nanofiltration are performed, lime milk is added to interception water obtained through nanofiltration, calcium sulfate is obtained, a supernatant flows back to a miscellaneous salt sedimentation basin, nanofiltration permeate water is concentrated through a reverse osmosis separator A and then is concentrated by a brine concentrator, fresh water produced by the brine concentrator is concentrated by a reverse osmosis concentrator B and flows back to the brine concentrator, concentrated water produced by the brine concentrator enters an crystallizing evaporator and is subjected to hot separation and cold separation, sodium chloride and sodium nitrate are obtained respectively, most crystallization mother liquor is subjected to refluxing treatment, and a small part of crystallization mother liquor is dried; reverse osmosis produced water and distilled water are reused. According to the invention, commercial calcium carbonate, magnesium hydroxide, calcium sulfate, sodium chloride, sodium nitrate salts and high-quality reused water are recycled, emission of solid waste is small, and the operating cost is low.

Purification techniques have been developed for ceramic powder precursors, e.g., barium nitrate. These techniques can be performed using one or more of the following operations: (1) removal of impurities by precipitation or coprecipitation and separation using a nonmetallic-ion-containing strong base, e.g., tetraalkylammonium hydroxides; (2) reduction of higher oxidation-state-number oxymetal ions and subsequent precipitation as hydroxides that are separated from the solution; and (3) use of liquid-liquid exchange extraction procedures to separate certain impurities.

The invention relates to a production method for producing sodium nitrate with nitratine and the process steps thereof are that ore is crushed with the particle diameter below 2cm and is first treated with a multi-stage countercurrent hot soak so as to ensure that the content of NaNO3 in leaching solution is more than or equal to 450g/l, and then with a four-effect evaporation to remove NaCl and NaSO4 to ensure that the content of NaNO3 is more than or equal to 950g/l, and finally with centrifugation and drying after a three-stage vacuum cold separation crystallization to obtain the finished sodium nitrate. By adopting the method which has low dependency on natural conditions, water saving and low energy consumption and is suitable for low-grade nitratine mining, the overall yield of the sodium nitrate can reach more than 75 percent.

The invention discloses a waste dimethyl sulfoxide recovery and treatment method. The waste dimethyl sulfoxide recovery and treatment method is characterized in that a waste dimethyl sulfoxide solution is added with nitric acid, the mixture undergoes a neutralization reaction and an oxidation reaction, and dimethyl sulfone, sodium nitrate and sodium methanesulfonate crystals are separated from the reaction products. The method provided by the invention can realize recovery and recycle of a plurality of active components of the waste dimethyl sulfoxide, realizes change waste into valuables, is environmentally friendly and has the advantages of simple processes, environmental friendliness, no waste water discharge, low energy consumption and high extraction efficiency.

The invention discloses a method for preparing water soluble sylvite. The method includes the steps that A, inorganic base salt and smashed potassium-rich rock are mixed to obtain a first mixture, acid radical negative ions of the inorganic base salt correspond to negative ions of the water soluble sylvite, and the potassium-rich rock is the silicate mineral with the mass percent larger than or equal to 8% in terms of K2O; B, the first mixture is heated to be at the temperature smaller than or equal to 300 DEG C and melted, and a second mixture is obtained; C, the second mixture is heated to be at the temperature of 500 DEG C to 1,200 DEG C in a microwave mode, the temperature is kept for 10 min to 2 h, and a third mixture is obtained; D, the third mixture is cooled to be at the temperature of 80 DEG C to 120 DEG C, then water is led into the cooled third mixture, a fourth mixture is obtained, the temperature of the fourth mixture is kept for 6 h to 48 h at the temperature of 50 DEG C to 90 DEG C, solid-liquid separation is carried out, and then first filtered liquid is obtained; E, the first filtered liquid is concentrated and cooled, and the soluble sylvite is separated out. According to the preparing method, the potassium-rich rock serves as a raw material, a water solution of the soluble sylvite is obtained through two-time extracting, the technology is simple, the preparing cost is low, and the technology is safe.

Low-cost, high-purity strontium nitrate that is low in Ba, Na, Ca, Cr, and other impurities and that is suitable for use in airbags or the like is provided. High-purity strontium nitrate having a Ba content of 0.01 wt % or lower, an Na content of 0.005 wt % or lower, a Ca content of 0.01 wt % or lower, a Cr content of less than 0.001 wt %, and a purity of 99.5 wt % or higher is produced by a manufacturing method comprising a first step for performing crystallization by adding nitric acid to an aqueous solution obtained by dissolving a strontium compound as a starting material, a second step for separating the resulting crystals, a third step for crystallizing the resulting separated solution, and a fourth step for separating the resulting crystals.

The present invention is compositions and methods for improving seed germination rates or speed using a composition comprising at least one high valency silver ion. The compositions and methods of the present invention are effective in treating biofilms.

The invention discloses a method for preparing inorganic sylvine crystal and feed additive by using molasses fermented waste liquid, comprising the pretreatment of molasses fermented waste liquid, absorbing and separating K+ ion in the pre-treated molasses fermented waste liquid through the resin column, regenerating the resin column absorbing K+, crystallizing, cooling, centrifugally separating, washing, drying the eluate containing inorganic sylvine, obtaining inorganic sylvine crystal, spray drying after heating to condense or condensing the molasses fermented waste liquid after absorbing K+ by the resin column, obtaining the feed additive. The invention has simple technique, regenerates the resin, realizes the formation reaction and the de-sorption separation of sylvine, and has low production cost; the regenerating agent is served as the reaction raw material to generate inorganic sylvine without resin regenerated waste water, and the molasses fermented waste liquid is completely used. The invention has good environmental protection effect, remarkable economical benefits and social benefits.

As population density increases, the transportation of hazardous chemicals, including acids and disinfectants, lead to an increased incidence of spills while the consequences of spills become more serious. While solutions of halide acids, hypohalites and halites are safer disinfectants for transportation, handling, storage and use than traditional gaseous chlorine, the manufacturing cost of these disinfectants has here-to-fore limited their use. Economical processes are presented for the manufacture of O₂, halogen oxides, halide acids, hypohalites, and halates; as well as polynucleate metal compounds, metal hydroxides and calcium sulfate hydrate (gypsum). The instant invention presents methods and processes that incorporate the use of sulfur. This is while environmental regulators, such as the US EPA, require an increased removal of sulfur from hydrocarbon fuels, thereby creating an abundance of sulfur, such that the refining industry is in need of a way to dispose of said abundance of sulfur.

The invention discloses a method for controlling sodium nitrate quality in vacuum cooling crystallization technology, which comprises the following steps: 1, controlling the content of sodium nitrate in a high-temperature mother liquor in a vacuum cooling crystallization system as 850-1000 g/1; 2, during the vacuum cooling crystallization process, adding water to restrain separation by crystallization of sodium chloride and sodium sulfate, acquire sodium nitrate slurry, and reduce generation of fine grains; and 3, in an elutriation device, washing sodium nitrate slurry with water, during the washing process, performing mechanical stirring or gas stirring to re-dissolve separated sodium chloride, sodium sulfate, and part of darapskite. And under the action of echanical stirring or gas stirring, the darapskite not re-dissolved floats upwards on the liquid surface in the foaming form and overflows to the evaporation process for re-dissolution treatment. The washing solution goes back to the evaporation process. The method can reduce the content of sodium sulfate and sodium chloride in sodium nitrate products and enable the sodium nitrate content to meet the requirement of technical-grade superior products.