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Fast analysis method of molybdenum in molybdenum concentrate

A rapid analysis, molybdenum concentrate technology, applied in the preparation of test samples, measurement of color/spectral properties, etc., can solve problems such as difficulty in molybdenum determination, achieve good accuracy and precision, simple procedures, and easy operation. Effect

Inactive Publication Date: 2009-04-22
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have high accuracy and reproducibility, but they are all used for the analysis of ferromolybdenum, and it is difficult to directly apply them to the determination of molybdenum in molybdenum concentrates

Method used

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  • Fast analysis method of molybdenum in molybdenum concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 0.4005g of sample into a beaker, add about 20ml of nitric acid and 0.5g of potassium chlorate, cover with a watch glass, heat to dissolve and evaporate to a volume of about 5ml, after cooling slightly, add 10ml of hydrochloric acid, evaporate to 5ml, then add 10ml of hydrochloric acid, Evaporate to 5ml, cool to room temperature, add 20-25ml of water to rinse the watch glass and beaker wall, boil to dissolve the salt completely, add 8ml of 50% (weight) sodium hydroxide solution, heat to boil for 2min, remove and cool After reaching room temperature, transfer to a 100ml volumetric flask and dilute to volume with water. Dry filter with medium-speed quantitative filter paper, take 20.00ml of the filtrate into a beaker, add 1 drop of 0.5% phenolphthalein indicator, neutralize with hydrochloric acid (1+1) until the red color disappears and add 2 drops of excess, add 20ml of phenolphthalein with a pH of 5-7 Acetic acid-ammonium acetate buffer solution, heated to slightly...

Embodiment 2

[0020] Weigh 0.4123g sample into a beaker, add about 20ml nitric acid and 0.5g potassium chlorate, heat to dissolve and evaporate to a volume of about 5ml, after cooling slightly, add 10ml hydrochloric acid, evaporate to 5ml, then add 10ml hydrochloric acid, evaporate to 5ml, cool After reaching room temperature, add 20-25ml of water to rinse the watch glass and the wall of the beaker, boil to dissolve the salt completely, add 8ml of 50% (weight) sodium hydroxide solution, heat and boil for 2min, remove and cool to room temperature, then transfer to 100ml capacity Bottle, made up to volume with water. Dry filter with medium-speed quantitative filter paper, take 20.00ml of filtrate in a beaker, add 1-2 drops of 0.1% methyl orange indicator, neutralize with hydrochloric acid (1+1) until the solution changes from orange yellow to red, and add 2 drops in excess , add 15mL of acetic acid-sodium acetate buffer solution with pH=5-7, heat to a slight boil, take it off, slowly add 110....

Embodiment 3

[0022] Weigh 0.4376g of sample into a beaker, add about 20ml of nitric acid and 0.5g of potassium chlorate, cover with a watch glass, heat to dissolve and evaporate to a volume of about 5ml, after cooling slightly, add 10ml of hydrochloric acid, evaporate to 5ml, then add 10ml of hydrochloric acid, Evaporate to 5ml, after cooling to room temperature, add 20-25ml of water to rinse the watch glass and the beaker wall, boil on an electric stove to completely dissolve the salt, add 8ml of 50% (weight) sodium hydroxide solution, heat and boil for 2min, take After cooling down to room temperature, transfer to a 100ml volumetric flask and dilute to volume with water. Dry filter with medium-speed quantitative filter paper, take 20.00ml of the filtrate into a beaker, add 1 drop of 0.5% phenolphthalein indicator, neutralize with hydrochloric acid (1+1) until the red color disappears and add 2 drops of excess, add 25mL of phenolphthalein with a pH of 5-7 Acetic acid-ammonium acetate buff...

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Abstract

The invention relates to a fast analytical method of molybdenum in molybdenum concentrate, which comprises the following steps: weighed sample is added with nitric acid and potassium chlorate, heated and dissolved, and then is added with hydrochloric acid, heated, dissolved and evaporated after cooling down a little; after cooling down to room temperature, purging by adding water and heating are carried out so that the salt is completely dissolved; afterward, sodium hydroxide solution is added, heated and boiled, and then cooled down to room temperature before being immigrated into a volumetric flask, volume determining and filtering, after measuring a certain volume of filtrate and regulating pH value, a buffer solution with pH value of 5-7 is added, heated to slight boiling, and excessive plumbic titer with a fixed amount is added with constant stirring, heated, boiled and cooled down to room temperature; after that, the solution is immigrated into a volumetric flask, volume determined, let stand, filtered, and then lead content of the solution is measured by atomic absorption method. The analytical method has the advantages that the procedure is simple, the operation process is easy to control and easy to master, moreover, the measuring time is reduced to half of the gravimetric method, which is more suitable for analyzing and measuring flow sample, the result obtained has favorable accuracy and precision, and is accurate and reliable.

Description

technical field [0001] The invention relates to a rapid analysis method for molybdenum in molybdenum concentrate, in particular to an analysis method for indirect determination of molybdenum content in molybdenum concentrate. Background technique [0002] For the determination of molybdenum in molybdenum concentrate, the commonly used method is the lead molybdate gravimetric method. This method requires repeated washing and filtering to ensure that the lead ions are completely washed, and then performs multi-step operations such as ashing and burning. This method has cumbersome operation steps and time-consuming analysis, which is necessary for arbitration analysis and is not suitable for the determination of process samples. There are many reports on the titration of molybdenum, such as indirect titration with EDTA after reducing molybdenum with hydrazine sulfate, and direct titration with vanadate or lead acetate. These methods have high accuracy and reproducibility, but...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/28
Inventor 屈伟宋永胜王正模
Owner 有研资源环境技术研究院(北京)有限公司
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