7 results about "EDDHA" patented technology

The present invention relates to a method for preparing chelatable EDDHA, and more particularly, to a method for preparing chelatable EDDHA with high purity at an excellent yield.

The present application relates to a kind of gold extractant and its preparation method, application, the gold extractant is the aqueous solution containing inorganic copper salt, thiosulfate and EDDHA-Na, wherein, the molar concentration of Cu in the gold extractant is 0.005M-0.05M, S2O3 2+ Molar concentration is 0.005M-0.05M, S2O3 2‑ Molar concentration is 0.1M-1M;EDDHA-Na and water volume ratio is 1-20%.EDDHA-Na is mainly complexed with copper ion to form EDDHA-Cu complex ion, reduce the formation of copper-ammonia complex ion, thereby reducing the oxidation of thiosulfate ion, while EDDHA-Cu complex ion has catalytic effect on the dissolution of gold in thiosulfate ion solution, improve the leaching efficiency of gold.

The invention discloses a method for preparing high-quality o, o-EDDHA-FeNa through catalysis, and belongs to the technical field of chemical product processing, and the method comprises the following steps: preparing an o, o-EDDHA chelating agent solution; a polypropylene fiber grafted N-isopropylacrylamide-iron ion compound, a stearic acid modified hydrophobic light material of which the surface is loaded with photosensitive liposome, and a phase separation inducer are used as raw materials to obtain an iron ion slow release system; a photoacid generator is embedded in the photosensitive liposome; the iron ion slow release system is added into the o, o-EDDHA chelating agent solution at the temperature lower than 30 DEG C, water is added, the mixture is stirred to be uniform and then stands for layering, and the pH of the o, o-EDDHA chelating agent solution is 7-7.5; the preparation method comprises the following steps: adding a fiber composite layer into an EDDHA-FeNa chelate solution, standing for layering, heating to 50 DEG C, keeping the temperature, reacting for 30-40 minutes under illumination, stopping illumination, continuously keeping the temperature and reacting for 1 hour, filtering to remove the fiber composite layer after the reaction is finished, obtaining an o, o-EDDHA-FeNa chelate solution, concentrating the o, o-EDDHA-FeNa chelate solution, performing centrifugal separation to obtain an o, o-EDDHA-FeNa chelate component, and drying to obtain an o, o-EDDHA-FeNa finished product. The yield of the product is as high as 98.7%.

To provide a preparation method capable of preparing high-purity chelatable EDDHA with an excellent yield.SOLUTION: A method for preparing chelatable EDDHA comprises: a step (S1) of mixing phenol, ethylenediamine, glyoxylic acid and sodium hydroxide; a step of (S2) synthesizing a product by reacting the mixture at 75°C to 80°C; a step (S3) of collecting the product by heating the product to 55°C to 65°C; and a step (S4) of washing the collected product using a cleaning solution including deionized water.SELECTED DRAWING: None

The application discloses a cyanide evaporation detoxification method of cyanide tailings, which comprises the following steps: (1) pretreatment: the cyanide tailings are slurried with water, and the pH value is adjusted to 1-2; (2) cyanide dissociation: a cyanide dissociation agent is added to the slurry obtained in step (1), and the reaction is carried out in a closed state for 1-120 min; wherein the cyanide dissociation agent is one or more than two of EDDHA-Na, tin dioxide, stannous chloride, hydroxylamine hydrochloride, ascorbic acid and sodium borohydride; (3) reduced pressure evaporation: a defoaming agent is added to the slurry obtained in step (2), and reduced pressure evaporation is carried out, and the generated hydrogen cyanide gas is discharged from the slurry. Through the cooperation of the cyanide dissociation agent and the reduced pressure evaporation, the problem that the cyanide in the cyanide tailings is difficult to recover is effectively solved.

The present disclosure relates to a method for preparing chelatable EDDHA, and more particularly, to a preparation method capable of preparing high-purity chelatable EDDHA with an excellent yield.

This invention discloses an HPLC method for determining the ortho-O iron content in EDDHA-Fe chelates, comprising the following steps: S1. Sample pretreatment: S11. The sample is first extracted with an aqueous solution, followed by solid-liquid separation; S12. The liquid phase is purified by passing it through a strong acid cation exchange resin to obtain a purified solution; S13. EDTA salt is added to obtain a test solution; S2. HPLC detection: A C18 reversed-phase column is used, with gradient elution using mobile phase A and mobile phase B; mobile phase A is a 0.05-0.15% (w / w) aqueous solution of phosphoric acid with a pH of 2.5-3.0; mobile phase B is methanol. This invention, through optimized chromatographic conditions and innovative sample pretreatment, establishes a high-resolution, interference-resistant method for O-O detection, solving the problems of insufficient resolution, interference ion influence, and inaccurate quantification in existing methods.