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A method for characterization and detection of external seed crystal stability

A technology of adding seeds and detection methods, applied in the measurement of color/spectral characteristics, etc., can solve the problems of large deviation of stability judgment, deviation of seed activity, and large subjective influence of inspectors, so as to achieve high resolution performance and avoid artificial Error, strong operability effect

Inactive Publication Date: 2015-12-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is subject to the subjective influence of the inspectors. Due to the difference in the judgment of the blue phase by the human eye, there is a large deviation in the judgment of the stability, and there is a corresponding deviation in the activity of the seed crystal, resulting in a large fluctuation in the hydrolyzate, and there is a certain time lag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] A. Manually measure the stability index of the seed crystal: Take 10mL of the slurry that has been matured for 2min in a 500mL Erlenmeyer flask, slowly add an appropriate amount of distilled water at room temperature, and shake for 15s. If the liquid does not show a blue phase, continue to add water until it appears. Until the blue phase, measure the total volume of liquid in the Erlenmeyer flask as 260mL, that is, the stability index is 260mL / 10mL. The recording test time is 50s.

[0028] B. Light transmittance test: Take 5mL of the slurry that has been matured for 2 minutes in a 400mL beaker, calculate the volume of distilled water according to the ratio of 1:10 between the slurry and distilled water, add the measured distilled water while shaking along the wall of the cup, take a certain volume of mixed sample, Put it into a 1cm quartz cuvette, put the cuvette on the sample holder of the spectrophotometer, and use distilled water as a reference sample to test at a wa...

example 2

[0030] A. Manually measure the stability index of the seed crystal: take 10mL of the slurry that has been matured for 6min in a 500mL Erlenmeyer flask, slowly add an appropriate amount of distilled water at room temperature, and shake for 15s. If the liquid does not show a blue phase, continue to add water until it appears. Until the blue phase, measure the total volume of liquid in the Erlenmeyer flask to 180mL, that is, the stability index is 180mL / 10mL. The recording test time is 40s.

[0031] B. Light transmittance test: Take 5mL of the slurry that has been matured for 6 minutes in a 400mL beaker, calculate the volume of distilled water according to the ratio of 1:10 between the slurry and distilled water, add the measured distilled water while shaking along the wall of the cup, and take a certain volume of mixed sample. Put it into a 1cm quartz cuvette, put the cuvette on the sample holder of the spectrophotometer, and use distilled water as a reference sample to test at ...

example 3

[0033] A. Manually measure the stability index of the seed crystal: take 10mL of the slurry that has been matured for 15min in a 500mL Erlenmeyer flask, slowly add an appropriate amount of distilled water at room temperature, and shake for 15s. If the liquid does not show a blue phase, continue to add water until it appears. Until the blue phase, measure the total volume of liquid in the Erlenmeyer flask to be 130mL, that is, the stability index is 130mL / 10mL. The recording test time is 25s.

[0034]B. Light transmittance test: Take 5mL of the slurry that has been matured for 15min in a 400mL beaker, calculate the volume of distilled water according to the ratio of 1:10 between the slurry and distilled water, add the measured distilled water while shaking along the side of the cup, take a certain volume of mixed sample, Put it into a 1cm quartz cuvette, put the cuvette on the sample holder of the spectrophotometer, and use distilled water as a reference sample to test at a wav...

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Abstract

The present invention provides a characterization method and a detection method of external crystal seed stability. The characterization method includes the following steps: mixing an external crystal seed and distilled water according to a predetermined volume ratio to form a mixed sample; measuring light transmittance of the mixed sample in the presence of a reference solution; and characterizing the stability of the external crystal seed in the form of light transmittance. Specifically, with reduction of the light transmittance, the stability of the external crystal seed deceases. The method of the invention determines the stability of the external crystal seed through determination of the light transmittance of the mixed slurry containing treated crystal seed, and avoids human error, and has the advantages of high distinguish performance, strong maneuverability, fastness and accuracy.

Description

technical field [0001] The invention relates to the technical field of performance detection of seed crystals in the process of producing titanium dioxide by sulfuric acid method, and more specifically, relates to a characterization method and detection method for the stability of seed crystals added by titanyl sulfate alkali method in the process of producing titanium dioxide by sulfuric acid method. Background technique [0002] The main production processes of titanium dioxide include sulfuric acid method and chlorination method. At present, the sulfuric acid method titanium dioxide is still the main method in China. In the sulfuric acid titanium dioxide process, hydrolysis not only affects the economics of industrial production, but also has a great impact on the quality of the final product. Therefore, the hydrolysis process is one of the core processes in the sulfuric acid production, and it is also the most stringent control in the entire process. one of the places. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 任亚平吴健春路瑞芳石瑞成杜剑桥
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP