135results about How to "To achieve the purpose of removing impurities" patented technology

The invention provides a smelting separation method of rare earth ores. The method comprises the following steps: carrying out leaching, neutralization and impurity removal on sulfuric acid roast ores by using an aqueous solution of magnesium bicarbonate, and carrying out solid-liquid separation to obtain a magnesium-containing rare earth sulfate solution; and carrying out aqueous magnesium bicarbonate solution saponification P507 or P204 extraction transformation or magnesium bicarbonate precipitation transformation enrichment to obtain a high-concentration mixed rare earth chloride solution, carrying out extraction separation, and recovering rare earth from the above obtained aqueous magnesium bicarbonate solution precipitate to obtain various rare earth compound products. Magnesium sulfate-containing wastewater generated in the above process undergoes alkali transformation by cheap alkaline compounds of calcium and magnesium, and CO2 recovered in the smelting separation process is introduced to carry out carbonization purification in order to obtain an aqueous magnesium bicarbonate solution which can be reused in rare earth leaching, transformation, extraction separation and precipitation processes. The method has the advantages of realization of recycling of magnesium and CO2 and zero discharge of ammonia nitrogen and wastewater, great reduction of the production cost, improvement of the recovery rate of rare earths, and realization of green, environmentally-friendly and high-efficient clean production of the rare earths.

A method for preparing a rubber accelerator DM (2,2'-dithiobis(benzothiazole)) from 2-mercaptobenzothiazole coarse product as a raw material is provided and is characterized by comprising the steps of adding water and rubber accelerator coarse product M (2-mercaptobenzothiazole) into a reaction kettle with weight ratio of (1-20) to 1, and adding sodium hydroxide with weight ratio of sodium hydroxide to rubber accelerator coarse product M of 100 to (24-60), and reacting to generate M sodium salt liquid; standing solution, collecting supernatant and adding into an oxidation pot, dripping a mixed solution containing hydrogen peroxide with concentration of 1% to 27.5% and dilute sulphuric acid with concentration of 1% to 30% into the oxidation pot with the flow velocity of 1 to 8 m<3> / h under the condition that the temperature is 20 to 60 DEG C and the mixing speed is 50 to 1000rpm, and stopping dripping oxidant solution till the pH value of the solution reaches 4 to 9; and filtrating and washing DM material with the solution, and removing impurities in DM. The process is simple in process, the solvent can be recovered and recycled for use and the loss is small; and the method is nontoxic and harmless to the people, free from the waste gas and high in environmental protection property.

The invention discloses a method for detecting salmonella and staphylococcus aureus in food simultaneously. The method includes the following steps: 1), diluting a to-be-tested food sample according to GB4789 to obtain sample homogenate of 1:10, adding 50-65wt% of nitrilotriacetic acid solution into the sample homogenate according to the volume ratio of the sample homogenate to the nitrilotriacetic acid solution being (5-7):1, vibrating the mixture, adding phosphate buffer solution or 0.05% tween-20 contained phosphate buffer solution, performing centrifugal layering, and discarding an upper layer; 2), mixing a sample obtained after processing of the step 1) with immunomagnetic beads, vibrating the mixture, subjecting the mixture to standing and layering on a magnetic frame, discarding an upper layer, and washing a lower layer of the sample, wherein the immunomagnetic beads are obtained by modifying salmonella and staphylococcus aureus antibodies, which are labeled by magnetic bead coupled biotin, by streptavidin; 3), adding the phosphate buffer solution to the washed sample, vibrating the mixture, applying the mixture to an LB plate, and performing cultivation and observation. The method is simple and convenient to operate, accurate, efficient and low in cost, two target bacteria are enriched, and detection time can be shorten from 72h to 25h.

The invention discloses a preparation method of high-purity gold for the electron industry. After gold ingots are rolled into pieces, the pieces are dissolved in aqua regia, a solution is made, nitrate is removed, and a chloroauric acid solution is obtained; sulfuric acid and sodium hydroxide are added to the gold solution, the pH value of the solution is adjusted, the solution is fully stirred and left to stand, and impurities, namely, metal ions, are deposited fully; the solution is subjected to filtration under reduced pressure by the aid of a micro-pore filtering film after being left to stand, and a pure gold solution is obtained; a reducing agent is slowly added to the pure gold solution, the solution is stirred, full reduction, filtration and washing are performed, and gold powder is obtained; the gold powder is placed in a polytetrafluoroethylene container to be boiled and washed with a dilute nitric acid and hydrofluoric acid mixed solution, the solution is filtered and is washed with hot deionized water to be neutral, vacuum drying is performed, and the high-purity gold is obtained. The gold prepared with the method has the purity higher than 99.999%, has the C and S content lower than 1 ppm, has the good smelting cleanliness and can be used as a raw material for high-purity gold evaporation materials for the electron industry.

The invention relates to an extraction method of nonextractable polyphenol in blueberry, and belongs to the technical field of extraction of plant polyphenol. The extraction method comprises the followings steps: preparing blueberry residue, preparing blueberry residue powder, performing acid solution soaking, performing alkali solution soaking, performing enzymolysis, centrifugation, extraction and collecting extractive. The extraction method is simple in operation steps, the operation steps can be performed in one container, and the extractive is not required to be repeatedly collected; weak concentration acid and alkali are adopted to treat materials, ethyl acetate and ethyl alcohol mixed liquor can be utilized for extracting, the method is mild, the bioactivity of the nonextractable polyphenol can be furthest reserved, the extraction ratio is improved, and the environmental pollution is very small.

The invention relates to a natural lipopeptide composite with biological activity extracted from conch, preparation and application in pharmaceutical fields of the same, which pertains to biological and pharmaceutical technical fields. The invention protects a lipopeptide composite with biological activity, preparation and application thereof. The lipopeptide is produced from marine organisms, can be used in treatment and improving hypertension and congestive heart failure.

The invention provides a preparation method of a battery grade lithium chloride, comprising: (1) calcium chloride is added into the acid clinker extracting solution of lithium concentrate - lithium sulfate solution, the PH value of the solution is regulated by NaOH to eliminate Fe and Mg, and the precipitation of CaSO4.2H2O, Fe(OH)3 and Mg(OH)2 and lithium chloride solution are obtained after the reaction; (2) the products of step (1) are filtered and cleaned to eliminate the precipitation of CaSO4.2H2O, Fe(OH)3 and Mg(OH)2, and the LiCl solution, i.e. a conversion solution is prepared; (3) the conversion solution is added with BaCO3, and filtered and cleaned after the reaction, to eliminate SO42- and Ca2+, and the LiCl concentrate liquid 1 is prepared; (4) the LiCl concentrate liquid is added with HCL and boiled to eliminate CO32-, and added with NaOH solution to back blend PH, then be evaporated, condensed, cooled, crystallized and separated, and the LiCl concentrate liquid 2 is obtained; (5) the LiCl concentrate liquid is added with refining agent, and filtered and cleaned after the reaction to eliminate Na, and the LiCl finish liquid is prepared, the LiCl finish liquid is condensed and dried, and finally the battery grade LiCl product is prepared. The invention has simple production process and can be easily operated.

The invention discloses a process for extracting colistin sulfate through a precipitation method. The process comprises the following steps of: (a) adjusting pH of fermentation liquor containing polymyxin E with oxalic acid or concentrated sulfuric acid, and filtering with a filtering device; (b) adding 0 metal complexing agent and inorganic flocculant to the filtrate, and reacting at normal temperature for 0.5 to 4.0h; (c) heating, cooling, and vacuum-filtering the reactive liquid; (d) adjusting pH of the filtrate above with aqueous alkali, separating the solid from the liquid to obtain a filter cake, dissolving the filter cake with sulfuric acid solution so as to obtain acidizing fluid, adding potassium permanganate and activated carbon to the acidizing fluid respectively, agitating for 0.5 to 2.0 hours, and then vacuum-filtering to obtain colistin sulfate liquid; and (e) centrifugally spray-drying the colistin sulfate liquid. With the adoption of the process, the common problems of the existing process for purifying fermentation liquor that the steps are complicated, the period is long, the labor intensity is relatively high, and the wastewater is difficult to treat and the like can be overcame.