65 results about "Selenium product" patented technology

The invention relates to a method for extracting selenium from selenium-deposited residue. The method comprises the following steps of: dissolving selenium-deposited residue to an alkaline sodium sulfite solution, generating water-soluble seleno sodium sulfate through a reaction between elemental selenium and the sodium sulfite solution; fully reacting the seleno sodium sulfate under the acidification of sulfuric acid to obtain a selenium elemental precipitate; and washing and drying to obtain coarse selenium with the purity of about 90 percent. The invention realizes separation of copper, silver and selenium in the selenium residue, and the separated selenium can be directly refined due to higher purity, therefore, the process flow of selenium recovery is shortened, the recovery rate is increased, and the production cost is decreased; the trouble of high copper content of an anode plate in silver electrolysis in the gold and silver refining process is solved and the pass rate of primary silver powder electrolysis is increased. The invention can be applied to recovering and extracting selenium from materials, such as selenium-contained residue generated in the technical process by using a wet method for treatment or selenium-contained acid mud generated in the production process of the copper anode slime by using a pyrogenic method for treatment and can also be applied to the production of high-purity selenium products by directly purifying a coarse selenium raw material.

The invention discloses a method capable of improving selenium content for preparing polysaccharide selenite. The method comprises the steps of adding a selenium compound solution having the mass fraction of 60-80% by spraying to a polysaccharide or a polysaccharide complex under a stirring condition and reacting at a temperature in the range of 120-160 DEG C; after the reaction is completed, purifying and drying the reaction product to obtain polysaccharide selenite, wherein the selenium compound is seleninic acid or a selenite. The method is simple in process, easy in after-treatment, controllable in reaction conditions and good in repeatability; in the production process, the generation of toxic gases such as hydrogen selenide is avoided and the use of a strong acid and heavy metals such as a barium salt to catalyze the reaction and the use of toxic organic solvents such as pyridine and benzene are avoided, and therefore, the production process is green and environment-friendly; the polysaccharide selenite prepared by the method is low in toxicity and high in bioavailability, and the selenium content of the polysaccharide selenite is higher than 18% which is far higher than the selenium content of less than 2% of the present commercial organic selenium products.

The invention relates to a production method for organic selenium, in particular to a production method of using the plant growth for conversing inorganic selenium to organic selenium, which is characterized in that plant seeds are soaked by an inorganic salt sodium selenite solution and to germinate and be planted, the plant growth converses the inorganic selenium to the organic selenium, and then organic selenium product can be acquired after treatment. The production method is simple in production process flow, efficient, nontoxic, edible, easy to absorb and convenient in use at a price as low as the iodized salt, thereby facilitating the populariztion.

The invention relates to the technical field of malt cultivating, and in particular relates to a cultivating and processing method of selenium-rich malt. The method comprises the steps of cultivating and germinating wheat seeds by taking selenium as a fertilizer, and after the wheat seeds are germinated, conducting washing, drying, and crushing to obtain selenium-enriched malt flour. By means of the cultivating and processing method of the selenium-enriched malt, disclosed by the invention, a malt selenium product with high selenium content can be stably obtained.

The invention discloses a production method for a rich-selenium Chinese chestnut, which solves the problems that the selenium content of a common Chinese chestnut cannot meet the needs of a human body and the selenium content in soil selenium application and punching for selenium injection is difficult to control, and the like. The method is characterized by simply spraying the solution of sodium selenite or sodium selenate (Se) to the leaf surfaces of the plant, each kg of the standard rich-selenium Chinese chestnuts is stably and flexibly controlled to contain 100-500 micrograms of selenium, thereby conforming to the national standard on rich-selenium products. The method has the advantages of low cost, simple dosing, convenient operation and the like. Other nutrient elements needed by the Chinese chestnut can be mixed with pest control medicines so as to improve the medicine effect and fertilizer efficiency. The medicine is prepared by fruit growers when necessary, and is easy to popularize and use. Each chestnut is marked with its selenium content, so that people different in supplement needs of selenium can check the acceptable daily intake of selenium to realize the nutritional supplement of selenium. Thus, the excessive or insufficient supplement of selenium is avoided. The selenium supplementing effect for people is ensured and the human health is promoted.

The invention relates to a vacuum refining and purifying method for a coarse selenium material and belongs to the field of metallurgy technological engineering. The method is characterized in that a fine selenium product is obtained from the coarse selenium material through procedures of smelting, degassing and vacuum distillation. The method specifically comprises the following steps: S1, adding the coarse selenium material into a closed container to be smelted at 230-350 DEG C; after the material is fully smelted, raising the temperature to 250-400 DEG C to degas, vacuumizing the closed container during degassing, and stirring the selenium melt at the same time to obtain a coarse selenium melt, the density of which is greater than 4g/cm<3>; and S2, putting the coarse selenium melt obtained in the S1 into a vacuum furnace, and distilling the coarse selenium melt for 3-4 hours to output a fine selenium product, wherein the vacuum degree is 1-20Pa and the temperature is 500-1000 DEG C. The method provided by the invention is short in process flow, and 99.9% of fine selenium can be output from the coarse selenium material through procedures of smelting, degassing and vacuum distillation.

The invention discloses a lactic acid bacteria elemental selenium product and a production method thereof, and belongs to the field of food biotechnology. The invention discloses a method for obtaining the elemental selenium product by adding selenite into a lactobacillus brevis-containing system. The lactic acid bacteria elemental selenium product and the production method thereof have the following advantages: firstly, the elemental selenium product having food safety characteristics is provided, and secondly, the method applying lactic acid bacteria fermentation to produce the elemental selenium is provided.

A method for purifying crude selenium comprises adding a regulating agent into that coarse selenium slag for pulping until the pH value is 6.5-7, oxidizing and pulping the coarse selenium slag by theregulating agent simultaneously, shortening the process period and reducing the cost, pumping and filtering to obtain coarse selenium powder, and condensing filter cake after vacuum distillation to obtain refined selenium. According to the invention, the regulating agent is added into the crude selenium slag, wherein the regulating agent is a mixed solution of oxidant and alkali, and the mixed solution undergoes oxidation reaction with impurity elements in the crude selenium slag, so that the occurrence state of impurity components is changed and slurry is mixed at the same time; using the difference between the properties of impurity oxides with changed occurrence states and selenium under vacuum conditions, selenium and impurity elements are efficiently separated through vacuum distillation, the content of impurity elements in selenium is reduced, and selenium products with high purity are obtained.

The invention discloses a manufacturing method of biological selenium, which comprises the following steps: utilizing specific selenium-rich fertilizer; immersing seed; fertilizing; fermenting solid plant; culturing the biological fresh selenium product; drying under low temperature; grinding; making the product.

The invention is a preparing process of novel organic selenium-methionine selenium, and its characteristic: the process of the methionine selenium product includes the working procedures of selenium dichloride synthesis, selenium tetrachloride synthesis, methionine salt synthesis, methionine selenium synthesis, drying, crushing, etc, and the novel methionine selenium has high biological utilization ratio, low toxicity, improves the oxidation resistance and immune function of the organism and regulates internal secretion by enhancing the activity of glutathione peroxidase in tissue cells and plays a remarkable role in oxidation resistance, immune efficiency of body fluid, promoting the growth of domestic fowls and animals, improving quality of muscles, etc.

The invention provides a wet method used for extracting products from low-grade complex material containing tellurium and selenium. The wet method comprises following steps: leaching by sodium sulfite; decomposition and generation, reduction of selenium, oxidation, reduction of tellurium, and oxidation of zero-valent tellurium. The grade of the selenium products obtained by using the wet method is high; the selenium in the selenium-enriched products can be transformed into soluble chloride compounds under acidic conditions with addition of sodium chlorate and common salt, and the soluble chloride compounds are dissolved. Zero-valent tellurium is formed and transferred into slag phase after reduction by SO2, so that preliminary separation of zero-valent tellurium from other impurity elements is realized; TeO2 raw material which can be used for pure tellurium production lines is obtained by oxidation-neutralization of zero-valent tellurium, so that effective separation and recovery of tellurium valuable metal are realized.

The invention belongs to the field of selenium resource utilization, and particularly relates to a method for preparing polysaccharide modified nanometer selenium on a large scale and application. According to the method, a polysaccharide water solution and a reducing agent water solution are mixed, then deionized water is added into the mixture, then a mixed solution is obtained, then a sodium selenite water solution is added for uniform stirring, then purifying is conducted, and therefore a polysaccharide modified nanometer selenium water solution is obtained. The preparing method for industrially producing nanometer selenium on a large scale is simple, and the problems of corrosion and contamination caused by acetic acid during industrialized production are well solved. The scale of a reaction system is enlarged to an industrial level, which is a great breakthrough compared with other small-scale laboratory reaction systems. The prepared polysaccharide modified nanometer selenium has the size of 80-120 nm, and is stable. In this way, the polysaccharide modified nanometer selenium can be widely applied to rich-selenium products, rich-selenium foods and all kinds of medicine products.

The invention relates to a method suitable for further purifying a crude selenium product with the selenium mass percent of 97-99% to prepare high-purity selenium with the grade of 99.999% or above, and belongs to the technical field of nonferrous metallurgy engineering. The preparation method includes the steps that a crude selenium material is crushed until the particle size is 3 mm or below, the crude selenium material is placed in a quartz tube furnace for oxidative distillation, and the furnace temperature is controlled to be 550-600 DEG C; sublimation and recondensation are performed inthe furnace after condensation, and the furnace temperature is controlled to be 500-600 DEG C; then, the material is conveyed into a glass-lined reactor, and deionized water is added for a water-soluble reaction; the solution is filtered through a bag filter and then placed in the glass-lined reactor, hydrazine hydrate with the concentration of 10-15% is dropwise added, and a generated paste-likeprecipitate is collected to obtain the high-purity selenium product. The whole technical method for preparing the high-purity selenium has the advantages of short flow, airtightness and no pollution,and thus the high-purity selenium product meeting the Se99.999 and Se99.9999 brand standard can be prepared with high efficiency, environmental protection and energy conservation.

The invention provides a method for separating and recovering selenium in chalcogenide glass waste. The method comprises the following steps: (a) crushing and sieving the chalcogenide glass waste to obtain powder with particle size of less than 75mu m; (b) mixing the powder obtained in the step (a) with a strong alkaline solution, carrying out alkaline extracting, and filtering to obtain a mixed solution; (c) mixing the mixed solution obtained in the step (b) with concentrated sulfuric acid and an oxidizing agent, carrying out controlled-potential oxidation and selenium precipitation, and filtering to respectively obtain filtrate and a crude selenium product, wherein the potential in the controlled-potential oxidation and selenium precipitation is 150-300mV. Compared with the prior art, the method firstly controls the particle size of the chalcogenide glass waste to be less than 75mu m, and adopts the controlled-potential oxidation and selenium precipitation after the alkaline extracting is finished, so that the selenium elementary substance is obtained by carrying out low valence oxidation on the selenium, and the selenium is effectively separated from germanium, arsenic, and thelike. The method for separating and recovering the selenium in the chalcogenide glass waste is high in recovery rate; the selenium obtained by using the method is good in purity; the method does not need large equipment for performing fire roasting, thus being low in energy consumption; furthermore, the method is free from pollution caused by harmful gases.

The invention relates to selenium yeast for feeds and a preparation method thereof. The preparation method of the selenium yeast for feeds comprises the following steps of: mixing beer yeast subjected to secondary liquid culture with a feed fermentation substrate and water in a weight ratio of (1-2) to (10-20) to (5-10); fermenting at 30-45 DEG C for 36-78h; and then, drying and crushing the fermented materials to obtain a finished selenium yeast product for feeds in the invention. The method provided by the invention is simple and easy to produce in batch. The selenium yeast prepared by utilizing the method of the invention contains organic selenium up to 500-1000 mg/kg, and the selenium product provided by the invention contains live yeast bacteria up to 2 billion/g and crude protein upto 35 percent, is safe and non-toxic and has less investment, rapid effect and high benefits.

The invention discloses a rotary kiln selenium distillation system which comprises a steel main platform, a slurrying charging system, a sulphating roasting rotary kiln, a selenium absorption system and a production line control system, wherein the slurrying charging system, the sulphating roasting rotary kiln, the selenium absorption system and the production line control system are all arranged on the steel main platform; the slurrying charging system is connected with the left end of the sulphating roasting rotary kiln; the selenium absorption system is connected with the sulphating roasting rotary kiln and comprises a vacuumizing device, a waste heat recovery and smoke discharge system and a selenium absorption device; the sulphating roasting rotary kiln comprises a rotary kiln body and a fuel gas heating system; and a kiln head gas guide pipe is arranged at the upper end of the rotary kiln body and is connected with the selenium absorption device. According to the system disclosed by the invention, large-scale industrial production of selenium products can be realized, and the system has the advantages of high efficiency, high safety and slight pollution.

The invention discloses a method for preparing selenium. The method comprises the following steps: (1) dissolving and leaching selenium-containing lead smelting smoke by adopting hydrochloric acid, and then filtering to obtain leached filter residues and a selenium-containing liquid; and (2) adding sodium sulfite to the selenium-containing liquid for oxidation-reduction reaction, separating to obtain a selenium-containing solid after the oxidation-reduction reaction is finished, then washing by using water, and drying to obtain a selenium product. The method disclosed by the invention has the advantages of high adaptability on a raw material, simple process, easiness for operation, high selenium leaching rate and less pollution, and can be used for enhancing the recycling rate of the selenium prepared from the lead smelting smoke, thus preventing the selenium resource waste.

The invention discloses a cultivation and planting method of selenium-enriched rice. The method includes the following steps that firstly, an inorganic selenium salt solution is prepared, wherein water and sodium selenite are weighed, the sodium selenite is fully dissolved in the water, and a sodium selenite diluent is obtained; secondly, a polysaccharide selenate substance rich in organic selenium is prepared, wherein seaweed in the sea serves as a carrier, the sodium selenite diluent is adsorbed by the seaweed, and by means of biological conversion of red algae, a polysaccharide substance in the seaweed and the sodium selenite are grafted into the polysaccharide selenate substance; thirdly, the polysaccharide selenate substance in the seaweed is purified, and the purified polysaccharide selenate substance is prepared into a polysaccharide selenate solution; fourthly, the prepared polysaccharide selenate solution is sprayed from the flowering stage of the rice to the filling stage. By means of the biological integration technology, the conversion rate of organic selenium in plants can be greatly increased; meanwhile, organic selenium polysaccharides in an organic selenium system are basically non-toxic organic selenium products, and the human body can not be harmed even after excessive eating.

The invention discloses a method for removing impurity mercury from crude selenium, and belongs to the technical field of purification and impurity removal of scattered metal. The method comprises the steps: adding a vulcanizing agent into crude selenium slag which is crushed to 200 meshes or below, uniformly mixing and briquetting to obtain a mixed material, putting the mixed material into a closed furnace, and heating and vulcanizing in an inert atmosphere; carrying out vacuum distillation on the vulcanized selenium, enabling the selenium to enter a gas phase and be collected in a volatile matter form, and enriching generated mercury sulfide and valuable elements and enabling the generated mercury sulfide and the valuable elements to enter residues; and carrying out secondary distillation on the obtained selenium for further mercury removal. The method is simple in process, safe and controllable in process and convenient to operate, the mercury content in the final selenium product is smaller than 5 ppm, the direct recovery rate of selenium is larger than 96%, and the removal rate of mercury is larger than 99.8%.

The invention discloses a novel copper anode mud treatment process, and belongs to the technical field of non-ferrous metal smelting. The process is mainly divided into three process stages: (1) an anode mud wet copper, selenium and tellurium removal stage; (2) an anode mud wet lead, barium and bismuth removal stage; and (3) a Kaldo furnace pyrometallurgy stage. The innovation point of the process lies in that all copper, and part of selenium and tellurium are removed from the anode mud through the first process stage, and corresponding copper, tellurium and selenium products are produced; removing all lead, barium and bismuth in th second process stage is performed to produce corresponding lead, barium and bismuth products; a new anode mud Kaldo furnace pyrometallurgy treatment thought is provided through pretreatment impurity removal in the first two process stages, smelting operation can be canceled in the Kaldo furnace smelting stage, blowing operation is performed after direct material melting, and a large amount of precious metal-containing smelting slag (the output of the precious metal-containing smelting slag is generally 0.5-0.8 time of the weight of the anode mud) produced by the conventional Kaldo furnace smelting operation is avoided.

The invention discloses biological organic selenium earthworm selenium and a preparation method thereof. The method aims at overcoming the defects that an existing biological selenium product is low in organic selenium proportion, poor in safety, single in function, complex in production process, long in period and the like, and solving the problems that a traditional selenium-rich earthworm breeding method is long in earthworm selenium preparation period and low in efficiency. The method comprises the following steps: adding 1500mg/kg-2000mg/kg of a sodium selenite aqueous solution into earthworms, then carrying out enzymolysis through earthworm enzyme to prepare an earthworm selenium primary product, then adding 500mg/kg-1000mg/kg of the sodium selenite aqueous solution again to prepare an earthworm selenium medium product, and then adding earthworm enzymatic hydrolysate to obtain an earthworm selenium final product. The biological organic selenium earthworm selenium developed by the invention is short in production cycle, simple and convenient, the total selenium content is greater than 100mg/kg, the organic selenium content is greater than 80mg/kg, the earthworm selenium is prepared by earthworm enzymolysis, an initial product can be obtained within 21h at the soonest, and the method is suitable for large-scale standardized production.