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Method for measuring arsenic content in chrome ore

A method of determination, chromium ore technology, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of low detection results, incomplete digestion, poor stability of measurement results, etc., achieve short dissolution time, stable fusion sample results, and determination The result is a stable effect

Active Publication Date: 2015-11-04
连云港检验认证有限公司
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Problems solved by technology

[0004] This determination method is a common method for the determination of arsenic in mineral products, and it is suitable for most products that are easily digested by acid. Chromium ore is a product that is difficult to digest by acid, which is well known in the industry. The digestion by this method is not complete, and the stability of the measurement results is poor. The detection result is low; and because the detection limit of this method is applicable to the detection of arsenic in minerals is 0.001%, that is, 10 ug / g, and the arsenic in many chrome ores is less than 10 ug / g, these samples cannot be detected

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  • Method for measuring arsenic content in chrome ore

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, a kind of assay method of arsenic content in chrome ore, its step is,

[0028] (1) Preparation of sample solution:

[0029] Weigh 0.2g of arsenic-containing chrome ore sample, place it in a corundum crucible pre-added with 0.8g of sodium peroxide, cover the sample with 0.8g of sodium peroxide, and put the corundum crucible at a temperature of 600°C to melt 15min, take out, cool to room temperature;

[0030] Put the corundum crucible containing the molten material after cooling into a beaker, add 45mL hot water at a temperature of 60°C to the corundum crucible to soak the molten material, pour the soaked molten material into the beaker, and rinse with hydrochloric acid solution and water Rinse the residual melt inside and outside the corundum crucible into a beaker, add 8mL hydrochloric acid solution into the beaker, acidify and dissolve to obtain a melt solution, cool to room temperature, transfer the melt solution to a 100mL volumetric flask, and constan...

Embodiment 2

[0038] Embodiment 2, a kind of assay method of arsenic content in chrome ore, its step is,

[0039] (1) Preparation of sample solution:

[0040] Weigh 0.7g of arsenic-containing chrome ore sample, place it in a corundum crucible pre-added with 1.2g of sodium peroxide, cover the sample with 1.2g of sodium peroxide, and put the corundum crucible at a temperature of 700°C to melt 25min, take out, cool to room temperature;

[0041] Put the cooled corundum crucible containing the molten material into a beaker, add 55mL of hot water at a temperature of 100°C to the corundum crucible to soak the molten material, pour the soaked molten material into the beaker, and rinse with hydrochloric acid solution and water Rinse the residual melt inside and outside the corundum crucible into a beaker, add 12mL hydrochloric acid solution into the beaker, acidify and dissolve to obtain a melt solution, cool to room temperature, transfer the melt solution to a 100mL volumetric flask, and constant ...

Embodiment 3

[0049] Embodiment 3, the assay method of arsenic content in the chrome ore described in embodiment 1-2: in the preparation process of the sample solution described in step (1), accurate to 0.0001 g when weighing the chrome ore sample containing arsenic .

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Abstract

The invention discloses a method for measuring arsenic content in chrome ore. The method comprises the steps that sodium peroxide and chrome ore with arsenic are mixed in a corundum crucible and melt at the temperature of 600-700 DEG C, then the melt is dissolved, precipitated and acidized through a hydrochloric acid solution, a thiourea-ascorbic acid solution and water and diluted through water, even mixing is performed, and a specimen solution is obtained; a hydrochloric acid solution, a thiourea-ascorbic acid solution and water with the same volume as the prepared specimen solution are evenly mixed, and a blank solution is obtained; at least five samples of arsenic standard solutions with different volumes and the mass concentration being 1 [mu]g / mL are moved to a group of volumetric flasks, then the blank solution is added, dilution is performed through water, and a standard solution is obtained; finally, testing is performed in an atomic fluorescence spectrometer, a standard work curve of the standard solution is obtained, and therefore the arsenic content in the chrome ore is measured. According to the method, the sodium peroxide is adopted for melting the chrome ore, the dissolution time is short, the measuring result is stable, the melting temperature is made to range from 600 DEG C to 700 DEG C, samples are molten completely, and the measuring precision is improved.

Description

technical field [0001] The invention relates to a method for detecting chrome ore, in particular to a method for determining the arsenic content in chrome ore. Background technique [0002] Chromium ore is mainly used in metallurgical industry, chemical industry and construction industry, and can be used to manufacture alloy steel, fuel, chemical reagents, refractory materials, etc. It is an indispensable mineral raw material in my country's basic industries. [0003] As a common harmful element, arsenic will cause serious harm to human health and the environment in smelting, alloy manufacturing, metal processing, electroplating and other production processes. Finding a fast and accurate method for the determination of arsenic in chrome ore will contribute to the promotion of environmental protection. It is of great significance to guide the rational utilization of chromium ore. Regarding the determination method of arsenic in chrome ore, in the standard SN / T2721-2010 "Det...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 乔柱秦立俊姜郁夏新媛王恒徐师薛峰吴扬封亚辉郑建明
Owner 连云港检验认证有限公司
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