43 results about "Dithionate" patented technology

The process concerns hydrometallurgical processing of manganese sulphate and manganese dithionate containing liquors and recovery of water therefrom. Sodium sulphate and / or sodium dithionate containing liquors are derived from manganese sulphate and manganese dithionate containing liquids, which are then cooled to produce crystals of sodium sulphate decahydrate and sodium dithionate dehydrate. The sodium sulphate decahydrate and sodium dithionate dehydrate crystals are then heated to a temperature sufficient to decompose the sodium sulphate decahydrate crystals to form anhydrous sodium sulphate crystals, sodium dithionate hydrate crystals and water, after which water is removed from the sodium sulphate and sodium dithionate hydrate crystal. The sodium sulphate and sodium dithionate dehydrate crystals are then heated to form anhydrous sodium sulphate, sulfur dioxide and water or steam. The anhydrous sodium sulphate is then separated from the sulfur dioxide and water.

A process for water removal and / or recycling of sodium sulfate and / or sodium dithionate containing liquors derived from processing cobalt resource material essentially free of lithium comprising the steps of precipitation of cobalt as cobaltous carbonate or cobaltous hydroxide followed by removal thereof from the liquor, crystallization of sodium sulfate and sodium dithionate and removal of the crystals, followed by heating of the crystals to anhydrous sodium sulfate, sulphur dioxide and water and then separating the anhydrous sodium sulfate.

Antimicrobial compositions, especially those useful when applied topically, particularly to mucosal tissues (i.e., mucous membranes), including a cationic antiseptic such as biguanides and bisbiguanides such as chlorhexidine and its various salts including but not limited to the digluconate, diacetate, dimethosulfate, and dilactate salts; polymeric quaternary ammonium compounds such as polyhexamethylenebiguanide; silver and various silver complexes; small molecule quaternary ammonium compounds such as benzalkoium chloride and alkyl substituted derivatives; di-long chain alkyl (C8-C18) quaternary ammonium compounds; cetylpyridinium halides and their derivatives; benzethonium chloride and its alkyl substituted derivatives; and octenidine. The compositions can also include an enhancer component, a surfactant, a hydrophobic component, and / or a hydrophilic component. Such compositions provide effective topical antimicrobial activity and are accordingly useful in the treatment and / or prevention of conditions that are caused, or aggravated by, microorganisms (including viruses).

The invention provides a method for producing manganese sulfate from manganese oxide ores. The method comprises the steps of mixing the manganese oxide ore powder with an appropriate amount of carbon reducing agent such as pulverized coal evenly, adding concentrated sulfuric acid without adding water and mixing evenly to obtain a mixture, controlling the initial concentration of the sulfuric acid in the mixture to be greater than or equal to 70%, curing the mixture by use of reaction heat via self-heating reduction and reducing the quadrivalent manganese in the manganese ores into bivalent manganese, mixing the cured material with water for stirring and leaching, and filtering the leached ore pulp to obtain a leachate, adding an appropriate amount of manganese oxide ores to the leachate to realize the oxidative decomposition of manganese dithionate, and performing neutralization, purification and impurity removal and crystallization on the solution obtained by filtering to produce the manganese sulfate. The method has the advantages that the low-cost easily available carbon reducing agent such as the pulverized coal is utilized to directly reduce the manganese oxide ores at a low temperature, and therefore, the energy consumption and the cost are low and the smoke pollution problem of reducing roasting is avoided; the manganese oxide ore powder is utilized to realize the oxidative decomposition of the manganese dithionate in the manganese sulfate solution and therefore, the quality of the manganese sulfate product is improved.

Provided herein are methods for a novel bead-based next-generation “X-aptamer” selection scheme that extends aptamer technology to include X-modified bases, thus resulting in X-aptamers, at any position along the sequence because the aptamers are chemically synthesized via a split-pool scheme on individual beads. Also provides are application to a wide range of commonly used DNA modifications, including, but not limited to, monothioate and dithioate backbone substitutions. This new class of aptamer allows chemical modifications introduced to any of the bases in the aptamer sequence as well as the phosphate backbones and can be extended to other carbohydrate-based systems.

A process for the hydrometallurgical processing of manganese containing materials, the process characterized by the combination of a manganese dioxide containing feedstock and an acidic solution to form an acidic solution to be leached, and passing a volume of sulphur dioxide gas through that leach solution as the leaching agent, whereby no sintering or roasting pre-treatment step of the feedstock is undertaken and the levels of dithionate ion generated in the leach solution are less than about 5 g / l. Also described is a process for the production of electrolytic manganese dioxide.

The invention discloses a method for removing manganous dithionate in manganese ore desulfurizing liquid. Persulfate is added into the manganese oxide ore desulfurizing liquid, stirred and dissolved,ferrous sulfate is added, dithionate radical of the manganous dithionate in the manganese oxide ore desulfurizing liquid is oxidized into sulfate radical through sulfate radical and hydroxyl radical generated by high-order oxidation reaction between the persulfate and the ferrous iron, and thus the manganous dithionate in the manganese oxide ore desulfurizing liquid is removed. Through the method,purity of a manganese sulfate mother solution can be improved effectively, no energy needs to be consumed additionally to heat the manganese ore desulfurizing liquid, no acid or alkali needs to be consumed to adjust the pH of the desulfurizing liquid, technological conditions are simple and mild, operability is high, and industrialized application is easy to achieve.

The invention discloses an efficient decomposition method for manganous dithionate in manganese ore sulfur dioxide lixivium. The method comprises the main steps that under the temperature condition ofthe sulfur dioxide lixivium of manganese ore pulp, sulfuric acid, manganese dioxide (or manganese bioxide ore) and ferric iron are sequentially added into the lixivium, and under the constant-temperature and acid conditions, through the catalytic activity of high-valent metal of ferric iron and manganese bioxide and the chain reaction process formed by coordination catalysis reduction and free radical oxidation formed by ferric iron and manganese bioxide, rapid oxidization conversion from sulfur dioxide to sulfate radicals is achieved. The process method has the advantages that cost is low, and large-scale industrialization production is easy. Manganese sulfate of main components in the lixivium serves as reaction products, no new impurity is introduced, and the lixivium can be used for producing electrolytic manganese metal or manganese sulfate easily later.

The present invention relates to a rubber composition made of at least an elastomer matrix, a reinforcing filler and a vulcanization system, the elastomer matrix comprising a highly saturated elastomer and natural rubber from 0 to less than 30 phr, the highly saturated A diene elastomer comprising 1,3-diene units and greater than 50 mole percent ethylene units, the vulcanization system comprising the formula MO 3 S‑S‑A‑S‑SO 3 Dithiosulfate salts of M, wherein the symbol A represents an alkanediyl group or a group comprising two or more alkanediyl units passing through an oxygen atom or a sulfur atom, the formula -SO 2 ‑, ‑NH‑, ‑NH 2 + -, -N(C 1 -C 16 Alkyl)-or-COO-groups, or arylene or cycloalkylene groups are connected in pairs, and the symbol M represents a metal atom. The present invention enables an improved compromise between the formation of air bubbles in the rubber composition when leaving the vulcanizer and the hysteresis of said composition.

The invention provides a passivator for cadmium in neutral soil and an application method thereof. The passivator is composed of calcium oxide with a weight accounting for 0.3-2.0% of the weight of neutral soil, calcium dithionate monohydrate with a weight accounting for 0.3-2.5% of the weight of the neutral soil, and charcoal with a weight accounting for 0.3-1.34% of the weight of the neutral soil. The passivator for cadmium in neutral soil provided by the invention reacts with effective cadmium in the neutral soil by using calcium oxide and calcined gypsum (calcium dithionate monohydrate) so as to generate small-activity cadmium sediments such as cadmium hydroxide and the like, and charcoal and the like in the passivator can selectively adsorb cadmium ions with large activity in the soil so as to reduce the transportability of the cadmium ions, therefore, an effect of reducing the quantity of effective-state cadmium in the neutral soil is achieved, the restoration of contaminated soil is implemented, and a situation that the pH value of the soil before and after the soil is treated is not changed can be ensured.