7 results about "Cyclohexanediaminetetraacetic acid" patented technology

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The application discloses a preparation process of electronic-grade trans-1,2-cyclohexanediaminetetraacetic acid. The preparation process takes industrial-grade 1,2-cyclohexanediamine as raw material, reacts the 1,2-cyclohexanediamine with electronic-grade organic acid to generate a water-soluble salt, crystallizes at 0-30 DEG C, filters out the crystal to reserve the filtrate, adds an alkaline solution to the filtrate, then adds a polar organic reagent to extract, directly adds an aqueous bromoacetic acid solution to the oil phase to react, after the reaction is completed, adds electronic-grade dilute acid to precipitate trans-1,2-cyclohexanediaminetetraacetic acid until the PH of the system is less than or equal to 2, filters and reserves the solid, washes with pure water, and electronic-grade trans-1,2-cyclohexanediaminetetraacetic acid is obtained. The method has a clear process route, can effectively remove metal ion impurities in the synthesis process, the obtained trans-1,2-cyclohexanediaminetetraacetic acid product has high purity, can be used for preparing high-end semiconductor cleaning liquid, and meets the strict requirements of advanced processes on the purity of cleaning chemicals.

The invention belongs to the technical field of quantitative detection, and particularly discloses a method for detecting a chromium point and an acid value in a hot galvanizing passivation solution. The method comprises the following steps: diluting the hot-dip galvanizing passivation solution to obtain the diluted hot-dip galvanizing passivation solution, and then detecting the chromium point and the acid value of the hot-dip galvanizing passivation solution; wherein the chromium point is obtained by titrating a mixed solution of a diluted hot galvanizing passivation solution and an auxiliary complexing agent; the acid value is obtained by titrating the diluted mixed solution of the hot galvanizing passivation solution and the composite masking agent. The auxiliary complexing agent comprises sodium fluoride, citric acid and sulfuric acid, and the composite masking agent comprises cyclohexanediamine tetraacetic acid, oxalic acid and sodium dodecyl sulfate. The method for detecting the chromium point and the acid value, disclosed by the invention, can shield interference of impurity metal ions and ensure the accuracy of chromium point determination; the background interference of acid value determination can be reduced, and the accuracy of acid value detection is improved. The method provided by the invention can accurately judge the end point, reduce time consumption, reduce the reagent dosage and reduce the contact risk of hexavalent chromium.

The application discloses an organic alkali cleaning solution and a multistage coupling cleaning method for SiC shower heads, and belongs to the technical field of semiconductor component wet cleaning. The organic alkali cleaning solution comprises an organic quaternary ammonium compound, an organic alcohol amine, a chelating agent, an ammonium salt corrosion inhibitor and a fluorocarbon surfactant; wherein the chelating agent is a mixture of trans-cyclohexanediaminetetraacetic acid and diethylenetriaminepentaacetic acid. The multistage coupling cleaning method for SiC shower heads comprises the steps of sequentially performing isopropyl alcohol immersion ultrasonic cleaning, organic alkali cleaning solution immersion ultrasonic cleaning and pure water ultrasonic cleaning, and then combining micro-nano bubble cleaning. The selected organic alkali cleaning solution comprises a three-component synergistic system of trans-cyclohexanediaminetetraacetic acid, diethylenetriaminepentaacetic acid and ammonium citrate. The use of the chelating agent produces a significant synergistic chelation effect on various metal ions, and the ammonium citrate simultaneously plays multiple functions of corrosion inhibition, auxiliary chelation and particle dispersion, which helps to significantly improve the cleaning effect.

The invention discloses an iron metabolism marker detection kit with high anti-interference performance and application thereof, and belongs to the technical field of in-vitro diagnostic reagents. The invention provides a composite interference neutralization reagent group. The composite interference neutralization reagent group comprises the following working concentration components: 1 to 10 mmol / L of cyclohexanediamine tetraacetic acid, 20 to 100 mmol / L of triethanolamine, 0.5 to 3.0 mmol / L of potassium ferrocyanide, 0.1 to 1.0% w / v of polyethylene glycol, 0.5 to 5.0 mmol / L of sodium nitrite, 0.05 to 0.5% w / v of poloxamer 407 and 0.1 to 2.0 mmol / L of N-ethylmaleimide. The invention also provides an iron metabolism marker detection kit containing the composite interference neutralization reagent group. According to the invention, the interference of endogenous and exogenous substances is effectively eliminated through the synergistic interaction among the compound interference neutralization reagent groups, and the accuracy and reliability of a detection result are remarkably improved.

The application discloses a method for determining the content of soluble anions in bauxite, which comprises the following steps: extracting a bauxite sample by using an alkaline extracting solution containing cyclohexanediaminetetraacetic acid to obtain a to-be-tested solution; and determining the soluble anions in the to-be-tested solution by using an ion chromatography method, wherein the eluent used in the ion chromatography method is an alkaline eluent, and the detection mode used in the ion chromatography method is a suppressed conductivity detection mode; the soluble anions include any one or more of F ‑ , Cl ‑ , SO4² ‑ and NO3 ‑ . The method provided by the application can significantly improve the extraction efficiency and detection accuracy of the target anions, and can simultaneously determine multiple target anions.

A semiconductor substrate cleaning composition containing: hydrogen peroxide (A), a hydrogen peroxide stabilizer (B) which is at least one selected from the group consisting of oxalic acid, diethylenetriaminepentaacetic acid, hydroxyethyliminodiacetic acid, potassium oxalate, 5-phenyl-1H-tetrazole, triethylenetetraminehexaacetic acid, trans-1,2-cyclohexanediaminetetraacetic acid, 8-hydroxyquinoline, L(+) -isoleucine, DL-valine, L(-) -proline, hydroxyethylethylenediaminetriacetic acid, N,N-bis(2-hydroxyethyl)glycine, glycine, L-tryptophan, 2,6-pyridinedicarboxylic acid, benzothiazole, and DL-alanine, an alkali compound (C) which is at least one selected from the group consisting of quaternary ammonium hydroxide (C1) and potassium hydroxide (C2), and water.