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Method for determining content of magnesia in phosphorus ore

A technology of phosphate rock and magnesium oxide, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem that magnesium hydroxide cannot be completely washed down, and the accuracy of magnesium oxide is Low, high allowable error, to achieve the effect of small analysis error, easy operation and high analysis accuracy

Inactive Publication Date: 2010-05-26
HUBEI FORBON TECH
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Problems solved by technology

[0004] The accuracy of the magnesium oxide tested by this method is low, and the result is 0.7%-0.4% lower than the standard sample on average, which is much higher than the allowable error of the test, and this low test result is manifested on samples with low magnesium oxide content. more obvious
Because of the fibrous structure of the filter paper, the magnesium hydroxide precipitate cannot be completely washed down, and there is no phenomenon that can indicate whether the magnesium hydroxide is completely washed down
Therefore, the error will be relatively large in operation.

Method used

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  • Method for determining content of magnesia in phosphorus ore

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Embodiment Construction

[0008] The content of the present invention is described in detail below.

[0009] Weigh 1.0013g of the sample phosphate rock sample (MgO%=1.03) and place it in a 300mL beaker, add 40ml of aqua regia to dissolve the phosphate rock sample, filter after constant volume of 250mL with distilled water, accurately pipette 25mL of the filtrate, add 12mL of EGTA solution and 30mL of triethanolamine, stir for a while, add 2 drops of malachite green indicator, neutralize with sodium hydroxide solution until the solution is colorless, then add 3mL; heat to about 80°C, keep warm for 30min, at this time, the precipitate condenses into a block , filter while hot with filter paper with a small amount of absorbent cotton, wash the beaker and the precipitate with 40°C sodium hydroxide solution for 3 to 4 times, put the filter paper and the precipitate directly into the beaker, and dissolve the precipitate with 20 mL of 40°C hydrochloric acid solution; Dilute to 150mL with distilled water at 40...

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Abstract

The invention relates to a method for determining the content of magnesia in phosphorus ore, which comprises the steps of: when the content of the magnesia in the phosphorus ore is determined, directly placing filter paper together with a precipitate into a beaker after solution forms the precipitate and is filtered, dissolving the precipitate in 20mL of solution of hot hydrochloric acid, then performing subsequent titration step and blank experiment to calculate the content of the magnesia in the phosphorus ore, but not adopting hot hydrochloric acid and hot water to wash the precipitate on the filter paper. The method can effectively reduce analytical error and improve analysis precision.

Description

technical field [0001] The invention relates to a method for determining the content of magnesium oxide in phosphate rock. Background technique [0002] At present, the principle of the domestic determination method for magnesium oxide content in phosphate rock is: add EGTA and triethanolamine to the sample solution to mask interfering ions such as calcium, iron, aluminum, etc., and generate magnesium hydroxide precipitation in an alkaline solution with a pH>12. After filtration, the precipitate is dissolved in hydrochloric acid, and the acid chrome blue K-naphthol green B is used as an indicator in a solution of pH=10, and the content of magnesium oxide can be obtained by titrating with EDTA standard titration solution. [0003] The specific operation method is: weigh 1g of the sample (accurate to 0.0002g) and place it in a 300mL beaker, add aqua regia to dissolve the sample, filter after constant volume, accurately pipette part of the filtrate, add ethylene glycol dieth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 王仁宗操素芬刘裕沙淮丽陈君
Owner HUBEI FORBON TECH
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