Abstract: Provided is a method for inhibiting extractant degradation in the DSX process through the metal extraction control, the method comprising steps of: (a) adding limestone to a copper solvent extraction-raffinate to precipitate iron (Fe) and aluminum (Al) as a slurry, recovering a clarifying liquid; and (b) adding sulfuric acid to the recovered clarifying liquid to adjust the pH thereof.

Abstract: Provided is a method for inhibiting extractant degradation comprising preparing step, extracting step and scrubbing step, the method including: (a) the preparing step of a DSX solvent by adjusting the extractant concentration of the DSX solvent to a specific range; (b) the extracting step of metal included in the feed solution by adjusting the ratio of the organic (solvent) and an aqueous (solution) as a feed solution; (c) the scrubbing step of adjusting the zinc concentration of the solution using zinc sulfate; and (d) stripping step.

Abstract: Provided is a method for measuring the concentration of aliphatic hydroxy oxime and neodecanoic acid using gas chromatography. The method includes the steps of: (a) removing, from a reference material containing an extractant and a diluent, the diluent using a silica column; (b) generating a calibration curve by calculating each peak area of aliphatic hydroxy oxime and neodecanoic acid, which are extractants, by peak integration of gas chromatograms; and (c) calculating the peak area of the organic solvent used in DSX process through the steps (a) and (b) and comparing the peak area with the calibration curve of the step (b) to measure the concentration of aliphatic hydroxy oxime and neodecanoic acid.

Abstract: Provided is a method for recovering a valuable metal sulfide, the method including: (a) adding limestone to a residual solution including a valuable metal to remove iron and aluminum; (b) adding sulfuric acid and a sulfide to the solution from which the iron and aluminum are removed to recover the valuable metal sulfide; and (c) adding air or sulfuric acid to the solution from which the valuable metal sulfide is recovered to remove sulfur.

Abstract: Provided is a method for measuring the concentration of bis(2,4,4-trimethylpentyl) phosphinic acid using ICP-OES, the method including the steps of: (a) decomposing and dissolving an organic solvent into an acid; (b) preparing a phosphorus reference solution and producing a calibration curve using the phosphorus reference solution; and (c) measuring the phosphorus concentration (mg/L) of the solution of step (a) using the calibration curve of step (b) and calculating the concentration (v/v %) of bis(2,4,4-trimethylpentyl) phosphinic acid in the organic solvent using the phosphorus concentration.

Abstract: The present invention relates to the optical measurement of blood analytes, such as glycated hemoglobin (HbA1c) and serum albumin as a functional metric of mean blood glucose in the diagnosis of diabetic patients. Non-enhanced Raman spectroscopy is employed as the analytical method for quantitative detection of blood analytes. Using processing techniques, non-enzymatic glycosylation (glycation) of the analytes results in measurable and highly reproducible changes in the acquired spectral data, which enable the accurate measurements and classification of glycated and unglycated analytes.

Abstract: The present invention relates to devices, systems and methods for spectrally identifying tissues and guiding the introduction of a probe, needle, and medical instrument into a body structure. The probe can further be used for precise delivery of therapeutic agents to selected regions of the body.

Abstract: The present invention further relates to the selection of the specific filter combinations, which can provide sufficient information for multivariate calibration to extract accurate analyte concentrations in complex biological systems. The present invention also describes wavelength interval selection methods that give rise to the miniaturized designs. Finally, this invention presents a plurality of wavelength selection methods and miniaturized spectroscopic apparatus designs and the necessary tools to map from one domain (wavelength selection) to the other (design parameters). Such selection of informative spectral bands has a broad scope in miniaturizing any clinical diagnostic instruments which employ Raman spectroscopy in particular and other spectroscopic techniques in general.

Abstract: Disclosed is a method for producing high-purity lithium carbonate. The method includes: removing magnesium and boron from a brine; separating and removing the remaining magnesium and calcium; concentrating the resulting brine by spray drying to form a powder; washing the powder to concentrate lithium; and carbonating the lithium ions with sodium carbonate (Na2CO3).

Abstract: The present invention relates to the optical measurement of blood analytes, such as glycated hemoglobin (HbA1c) and serum albumin as a functional metric of mean blood glucose in the diagnosis of diabetic patients. Non-enhanced Raman spectroscopy is employed as the analytical method for quantitative detection of blood analytes. Using processing techniques, non-enzymatic glycosylation (glycation) of the analytes results in measurable and highly reproducible changes in the acquired spectral data, which enable the accurate measurements and classification of glycated and unglycated analytes.

Abstract: Disclosed is a method for producing high-purity lithium carbonate. The method includes: removing magnesium and boron from a brine; separating and removing the remaining magnesium and calcium; concentrating the resulting brine by spray drying to form a powder; washing the powder to concentrate lithium; and carbonating the lithium ions with sodium carbonate (Na2CO3).