33 results about "Soluble oxalate" patented technology

The invention discloses a chlorine decontaminant, which is characterized in that the chlorine decontaminant is prepared by mixing organic reducer accounting for 89.8 percent to 96 percent of the total weight, 3 percent to 10 percent of surfactant, 0.1 percent to 0.5 percent of thickener polyvinyl alcohol (PVA) and 0.1 percent to 0.5 percent of foam stabilizer dodecyl dimethyl amine oxide (DDAO). The organic reducer is chosen from soluble oxalate, citrate or ascorbic acid, starch, glucose, fruit sugar, tartrate, malate or lactate; the surfactant is chosen from polyoxyethylene alkyl ether sulfo-sodium succinate, coco-amide propyl betaine (CAPB), alpha-alkenyl sulfonate sodium, fluorine surfactant or sodium ethoxylated alkyl sulfate. When the decontaminant is carried out, the water solution with the concentration being 0.3 percent to 10 percent (weight percentage) is used and sprayed to the leakage area of chlorine by a fine water atomizing nozzle; the decontaminant of the invention combines physical dilution and chemical reaction, thus inhibiting the diffusion of chlorine and enhancing the reaction ratio, and the remained substances of the reaction are free of contamination and can be easily decomposed.

The invention discloses a process for producing high-purity basic magnesium carbonate from dolomite, which adopts a carbonization method and uses dolomite as a raw material. The method comprises the following steps: grinding, calcining, digesting the calcined dolomite, filtering, carbonizing magnesium emulsion, pyrolyzing a heavy magnesium solution, and drying to obtain basic magnesium carbonate.The carbonization process of the magnesium emulsion is as follows: after the magnesium emulsion is cooled, carbon dioxide is introduced; when the pH value reaches 7.5-9.5, oxalic acid or soluble oxalate is added to ensure that the concentration of oxalate groups in the system is 0.001-0.01mol/L; and after the system is mixed evenly, carbonization is performed continuously until the pH value is 6.5-7.0, filtration is performed, the filtrate is the refined heavy magnesium solution, and the residue is light calcium carbonate. By adding oxalic acid in the digesting process, the technical problem of the dolomite carbonization method that calcium and magnesium are difficult to separate thoroughly can be solved. The process is simple, is easy to control and has high magnesium oxide extraction rate and high product purity.

The invention relates to the technical field of environmental monitoring and analysis, and discloses a method for determining total phosphorus in soil or sludge, which comprises the following steps: (1) pretreating a sample; (2) converting phosphate; (3) establishing a standard curve; (4) detecting the sample by headspace gas chromatography; (5) calculating a result. The method comprises the following steps: by utilizing a phase inversion headspace gas chromatographic analysis technology, firstly, enabling phosphate to react with a calcium oxalate solid under an alkaline condition to generatecalcium phosphate and release soluble oxalate, and then enabling oxalate to react with permanganate under an acidic condition to generate carbon dioxide gas; the content of total phosphorus in soil and sludge samples can be calculated by measuring chromatographic signal values of carbon dioxide generated after phosphate is converted twice. The method not only can simplify the operation process andgreatly reduce the influence of interfering substances, but also does not use an organic extraction agent, thereby avoiding secondary pollution and meeting the purpose of green chemistry. The methodprovided by the invention is especially suitable for large-batch sample analysis of soil and sludge related research units.

The invention provides a method for preparing low-silicon low-calcium low-aluminium vanadium liquid, which comprises the following steps of dissolving a vanadium-containing material, and filtering to obtain a vanadium-containing solution; heating the vanadium-containing solution to 60 DEG C for boiling; adjusting the pH value of the vanadium-containing solution to 8-11; adding a first impurity removal agent into the vanadium-containing solution, and filtering to obtain a first purified solution; adjusting the pH value of the first purified solution to 8-11, and adding a second impurity removal agent into the first purified solution, wherein the first impurity removal agent is one or more of aluminium sulphate, aluminium sulphate, aluminium nitrate, iron sulphate, iron chloride, iron nitrate, magnesium sulphate, magnesium sulphate and magnesium nitrate, and the second impurity removal agent is soluble oxalate; and after the reaction is over, cooling and filtering to obtain vanadium liquid in which the Si content is lower than 0.005g/L, the Ca content is lower than 0.005g/L and the Al content is lower than 0.01g/L. The method provided by the invention can be used for effectively removing impurities such as silicon, calcium, aluminium and the like in the vanadium liquid; and the technology is simple and easy to use, the application range of the raw materials is wide, and the cost is low.

The invention discloses a preparation method of a high-specific capacity lithium ion battery anode material. The preparation method comprises the following specific steps: preparing micro-expansive graphite; adding silica powder and soluble stannous salt into water to obtain a turbid liquid, and adding soluble oxalate into the turbid liquid to obtain Si/SnC2O4 after solid-liquid separation of an obtained reaction liquid A; adding a manganese source and a zinc source into a solvent for reaction to obtain a reaction liquid B; adding the micro-expansive graphite and Si/SnC2O4 into the reaction liquid B, and carrying out ultrasonic dispersion, suction filtration and drying to obtain powder; and carrying out mixing cladding on the powder and a carbon source precursor to obtain the high-specific capacity lithium ion battery anode material. The preparation method is simple in processing steps, low in reaction condition requirement, easy to operate and low in cost; and the raw materials are economical and environment-friendly, and the materials are higher in specific capacity and cycling stability and easy for industrial production, so that the electric capacity of the prepared lithium ion battery anode material is high, the production efficiency can be greatly improved, and the material is suitable for volume production.

The invention relates to an environment-friendly nontoxic raticide, which is prepared by adopting soluble oxalate as a raticide bait, and specifically comprises 1-20% of oxalate, 2% of a synergist, 0.05% of a sweetener, 0.1% of a phagostimulant, 0.1% of a pigment, 3% of water, and the balance of grain. According to the invention, oxalate is a non-toxic and harmless natural product and cannot damage the environment, so that harm cannot be caused to human beings and other animals due to no toxicity; rescue is easy to achieve, wherein even if people or other animals eat the deratization bait containing oxalate by mistake to cause hypocalcemia and pain, the hypocalcemia symptom can be quickly eliminated by orally taking calcium tablets or injecting a calcium supplement injection, death cannotbe caused to people, and any sequelae cannot be left; the raticide provided by the invention is good in palatability, low in price and easily available in raw materials, is a real third-generation raticide, adopts oxalate to achieve deratization, is environment-friendly, safe, economic and efficient, is a cause of benefiting the nation and the people, and has good economic value and development prospect.

The invention discloses a manufacturing method of a high-pure super-fined tin oxide. The manufacturing method comprises the steps as follows: a tin oxalate is firstly prepared by the soluble tin salt and soluble oxalate; the tin oxalate is washed and dried, then is discomposed with a moderate temperate and then is baked with high temperature, and the baked tin oxide powder is pickled with a reagent grade inorganic acid and then is washed with a deionized water till the CL <-> is washed away, and then the high-pure super-fined tin oxide with average granule-diameter which is less than 1 micrometer and a purity which is equal to or greater than 99.5 percent and loose density which is 0.2 to 0.80g per cm <3> can be obtained sequentially by filtering, drying and crushing. The manufacturing process is verified through a pilot scale production.

The invention discloses a recombinant expression cassette for efficiently expressing soluble oxalic acid oxidase and a preparation method of an oxalic acid oxidase capable of efficiently expressing solubility and activity in Escherichia coli. Cellular supernatant is precipitated through ammonium sulfate, and a solution, which is re-dissolved through citric acid-sodium-citrate and contains oxalic acid oxidase, is directly applied to activity determination of oxalate decarboxylase. Compared with traditional methods such as commercially available oxalate determination kits and HPLC (high performance liquid chromatography), the determination method is higher in accuracy and sensitivity, low in time consumption and cost, applicable to high-throughput determination on a large number of samples through a micro-plate reader and high in practicality. The prepared oxalic acid oxidase can be applied to activity determination of enzymes with oxalic acid as substrate or product as well as to determination of the content of the oxalic acid in blood or urine of human or animals as well as various samples containing oxalic acid.

The invention discloses a method for determining the content of calcium in a feed, and belongs to the technical field of feed component detection. The determination method comprises the following steps: completely precipitating calcium ions in a to-be-determined feed into calcium oxalate by using a soluble oxalate solution, firing the calcium oxalate at 420-660 DEG C until the weight of generatedcalcium carbonate is constant, metering the mass of the generated calcium carbonate, and calculating the mass percentage content of calcium in the to-be-determined feed according to the mass of calcium in the calcium carbonate. According to the method, a titration analysis method in the prior art is converted into a gravimetric analysis method, so that the method solves the problems of complex andtedious operation steps, high requirements of an experiment method on detection personnel, long reaction process time, large measurement result error, narrow application range, high equipment cost and the like of an existing measurement method, can realize accurate measurement of calcium in the feed in a relatively short time, and has the advantages of being more accurate, quicker, low in cost, easy to operate and popularize and the like.