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Method for determining chloride ions in chrome ore

A chloride ion and chromium ore technology, applied in the direction of material electrochemical variables, can solve the problems of interfering chloride ion determination, inability to measure chloride ion, chloride ion loss, etc., and achieve the effect of accurately measuring chloride ion content

Inactive Publication Date: 2011-09-14
LIAONING ENTRY EXIT INSPECTION & QUARANTINE BUREAU TECHNICAL CENT FOR INSPECTION & QUARANTINE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acid-dissolved samples at high temperature, chloride ions and hydrogen ions easily generate hydrogen chloride gas and volatilize, resulting in the loss of chloride ions; alkali-fused samples at high temperature, the addition of a large amount of alkali flux will dissolve Cr 3+ Oxidized to Cr 6+ , interfere with the determination of chloride ions, and at the same time increase the blank value of the determination, which is not conducive to the determination of trace chloride ions
[0007] 2. Silver nitrate potentiometric titration and turbidimetry cannot be used to determine trace chloride ions in chromium ore: chromate ions and silver ions form silver chromate precipitates, which interfere with the determination of the end point of chloride ion titration by silver nitrate potentiometric titration; chromium ore The solution itself is colored, and chloride ions cannot be determined by silver nitrate turbidimetry.

Method used

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  • Method for determining chloride ions in chrome ore
  • Method for determining chloride ions in chrome ore
  • Method for determining chloride ions in chrome ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment one to the selection of sample details

[0053] The chemical composition of chromium ore is (Mg,Fe)Cr2O4, which is relatively complex. It is an insoluble magnesium-aluminum spinel mineral. Grind the chromium ore sample to be tested to a certain fineness. When the fineness of the chromium ore analysis sample is ≤75 um, it can be Ensure maximum dissolution of the chromium ore sample in the acid.

Embodiment 2

[0054] The selection analysis of embodiment two sample dissolution methods

[0055] 1. Comparative analysis of solvents

[0056]1) Sodium peroxide melting sample: Sodium peroxide is a strong oxidizing alkaline flux, which has a strong ability to decompose chromite. During the decomposition process of the sample, the following reactions may occur to make chlorine Volatility loss. ① Sodium peroxide can oxidize chloride to chlorine and volatilize and lose; ② Chromium in chromite is quantitatively oxidized to hexavalent, and hexavalent chromate is oxidizing, and can undergo oxidation-reduction reactions with chloride to volatilize chlorine loss, such as CrO 2 Cl 2 With a boiling point of 115.8, chromium will form volatile chromium chloride with chloride ions and be removed. Therefore, sodium peroxide is not easy to be used as a flux for the determination of chloride in dissolved samples.

[0057] 2) Sodium hydroxide flux: Sodium hydroxide is a non-oxidizing alkaline flux, whi...

Embodiment 3

[0074] The selection of embodiment three total ionic strength modifier (TISAB)

[0075] 1. Selection of the type of total ionic strength regulator (TISAB)

[0076] The ion-selective electrode measures the activity of ions in solution according to the Nernst equation, and the activity of ions is equal to the product of the activity coefficient and the concentration. The activity of an ion in a solution is mainly determined by the ionic strength of the solution. Obviously, when the temperature is constant and the ionic strength is constant, the activity coefficient of ions is constant. Total Ionic Strength Adjustment Buffer (TISAB, Total Ionic Strength Adjustment Buffer) is a buffer solution used to keep the solution with high ionic strength. Since the potential value in the potentiometric analysis method is often in a linear relationship with the logarithm of the activity of the analyzed ions, the total ionic strength regulator is of great significance to the accuracy of the ...

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Abstract

The invention discloses a method for determining chloride ions in a chrome ore, which belongs to the technical field of determining the content of chloride ions in the chrome ore. In the method, a chrome ore sample is dissolved by a sulfur-phosphor mixed acid, so that a solution to be determined is prevented from generating Cr6+; loss of the chloride ions is prevented by dissolving the chrome ore sample with a capped closed container; influence of coexistence elements on the determination result of the chrome ore solution to be determined is reduced by adding a total ionic strength adjustment buffer (TISAB), and the content of the chloride ions can be accurately determined by an ion selective electrode method.

Description

technical field [0001] The invention relates to a method for measuring the content of chloride ions in chrome ore, which belongs to the technical field of measuring the content of trace chloride ions in chrome ore. Background technique [0002] Chromium ore is an important bulk resource mineral product, which is widely used in metallurgical industry, chemical industry and refractory material industry. As chrome ore is a shortage of resources in my country, imported chrome ore has become the main source to meet smelting needs. About 80% of the annual consumption depends on imports, so China has become one of the major importers of chrome ore in the world. [0003] Chlorine is a harmful element produced in the metal ore smelting process. It can not only corrode pipeline equipment and affect product quality, but also pollute the environment and pose a threat to environmental safety and people's health. With the massive import of chrome ore, its potential hazards are also incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/49
Inventor 胡晓静曾泽仇薪越周明辉盛向军赵景红
Owner LIAONING ENTRY EXIT INSPECTION & QUARANTINE BUREAU TECHNICAL CENT FOR INSPECTION & QUARANTINE