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Method for determination of content of lead in chrome ore

A determination method and technology of lead content, which is applied in the preparation of test samples, fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems that are not suitable for the determination of lead in chrome ore, and achieve stable fusion sample results, ensure stability, well-designed effects

Active Publication Date: 2015-11-18
LIANYUN PORT IMMIGRATION INSPECTION & QUARANTINE BUREAU PEOPLES REPUBLIC OF CHINA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used methods for the determination of lead in other minerals mostly use acidic systems to digest under normal pressure or microwave high pressure, and use analytical instruments such as atomic absorption to measure. Tests have proved that most chromium ores are difficult to dissolve in acid systems, and these common methods are not suitable for chromium ores. Determination of lead in

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  • Method for determination of content of lead in chrome ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, a kind of assay method of lead content in chrome ore, its step is,

[0027] (1) Preparation of sample solution

[0028] Weigh 0.2g of lead-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 600°C for melting 15min, take out, cool to room temperature;

[0029] Put the cooled corundum crucible containing the melt into a beaker, add 45mL of hot water at a temperature of 60°C to soak the melt, pour the soaked melt into the beaker, and wash the inside and outside of the corundum crucible with hydrochloric acid solution and water. Rinse the residual melt into the beaker, then add 8-12mL hydrochloric acid solution into the beaker, dissolve the precipitate and acidify to obtain the melt solution, cool to normal temperature, transfer the melt solution to a 100mL volumetric flask, dilute with water to the mark, mix;

[0030] Pipette 3...

Embodiment 2

[0037] Embodiment 2, a kind of assay method of lead content in chrome ore, its step is,

[0038] (1) Preparation of sample solution

[0039] Weigh 0.7g of lead-containing chromium 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;

[0040] Put the cooled corundum crucible containing the melt into a beaker, add 45mL of hot water at 100°C to soak the melt, pour the soaked melt into the beaker, and wash the inside and outside of the corundum crucible with hydrochloric acid solution and water. Rinse the residual melt into the beaker, then add 12mL hydrochloric acid solution into the beaker, dissolve the precipitate and acidify to obtain the melt solution, cool to room temperature, transfer the melt solution to a 100mL volumetric flask, dilute with water to the mark, and mix well ;

[0041] Pipe...

Embodiment 3

[0048] Embodiment 3, the assay method of lead content in the chrome ore described in embodiment 1: in the on-machine test described in step (4), fluorescence intensity test is 230mV at negative high voltage, lamp current is 55mA, atomizer height It is carried out under the conditions of 6mm, auxiliary gas flow rate of 380mL / min, and shielding gas flow rate of 700mL / min.

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Abstract

A method for determination of the content of lead in a chrome ore comprises the steps: mixing sodium peroxide with the lead-containing chrome ore in a corundum crucible, melting at the temperature of 600-700 DEG C, then dissolving a precipitate and acidifying the melt with a hydrochloric acid solution and water, diluting with water, mixing evenly, and thus obtaining a sample solution; mixing evenly a hydrochloric acid solution and water with the same volume as that for preparation of the sample solution, to obtain a blank solution; respectively transferring at least five different volumes of lead standard solution with the mass concentration of 0.25 [mu]g / mL in a group of volumetric flasks, adding the blank solution, diluting with water, and thus obtaining the calibration solutions; and finally, testing in an atomic fluorescence spectrometer, to obtain a standard working curve of the calibration solutions, so as to test the content of lead in the chrome ore. With adopting of sodium peroxide to melt the chrome ore, the dissolution time is short, and the determination results are stable; the melting temperature is selected in the range of 600-700 DEG C, so that the sample complete melting can be met, and the molten sample result is stable; and with the calibration solutions as the benchmark, the measurement accuracy is improved.

Description

technical field [0001] The invention relates to a method for detecting chrome ore, in particular to a method for determining the content of lead 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. China's proven geological reserves of chromium ore rank 12th in the world, which is a resource in short supply. The chromium ore used in my country is mainly imported, and its origins include southern Africa, Albania, Turkey, Pakistan, India, Iran, the Philippines, Brazil, Australia, Indonesia and other countries and regions. [0003] With the continuous increase of my country's chrome ore trade, product quality varies, and environmental safety issues are becoming more and more serious. As a harmful element, lead not ...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N1/28G01N1/38
Inventor 乔柱姜郁秦立俊石慧夏新媛王恒赵秀荣刘亚军徐师封亚辉郑建明
Owner LIANYUN PORT IMMIGRATION INSPECTION & QUARANTINE BUREAU PEOPLES REPUBLIC OF CHINA
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