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Method for measuring magnesian in phosphorus ore

A technology of magnesium oxide and phosphate rock, which is applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of complex process, time-consuming operation, and large influence of analysis operators. And other issues

Inactive Publication Date: 2008-03-05
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] When determining magnesium oxide in phosphate rock, aqua regia and alkali fusion are often used as solvents for decomposing samples, and the operation is time-consuming and has a great impact on the analysis operators, which is not conducive to health, and the process is complicated

Method used

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  • Method for measuring magnesian in phosphorus ore
  • Method for measuring magnesian in phosphorus ore
  • Method for measuring magnesian in phosphorus ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first is the preparation of the main reagents:

[0020] Mixed solvent: Weigh 80g AR grade KCl and dissolve it in 500mL water, slowly add 500mL AR grade HNO 3 After dissolving and mixing, the fixed solution is 1L.

[0021] Acid chrome blue K-naphthol green B indicator: weigh 0.2 g of acid chrome blue K, 0.3 g of naphthol green B and 40 g of dry KCl, put them in a mortar, grind and mix well, store in a small brown jar .

[0022] Secondly, the test method is as follows:

[0023] Weigh 0.2000g sample into a 250mL beaker, add 10mL KCl-HNO 3 The mixed solvent is boiled slightly on the electric heating plate for 6 minutes, then removed, precipitated and separated according to GB / T1871.5-1995, and the magnesium oxide is determined by the EDTA volumetric method, and filtered with filter paper pulp cushioned with sponge balls, the purpose of which is to speed up the filtration speed , titrated with the prepared acid chrome blue K-naphthol green B, the end point changes si...

Embodiment 2

[0048] On the basis of the experimental method of Example 1, the KCl mass concentration is 50g / L; HNO 3 The molar concentration of 6mol / L was prepared into 1L of mixed solvent for experimentation, and 6mL of mixed solvent was added and dissolved for 3min under the condition of heating at 60°C for experimentation. The measurement results are shown in Table 6, which shows that this method is feasible.

[0049] Table 6 ω(MgO) / 10 -2

[0050]

Embodiment 3

[0052] On the basis of the experimental method of Example 1, the KCl mass concentration is 100g / L; HNO 3 The molar concentration of 12mol / L was prepared into 1L of mixed solvent for experimentation, and 12mL of mixed solvent was added and heated on an electric heating plate at 100°C, and dissolved for 7 minutes for experimentation. The measurement results are shown in Table 7, which shows that this method is feasible.

[0053] The invention can quickly measure phosphorus pentoxide in sedimentary phosphorite rock ore, and the accuracy and precision of the result are high. Compared with the quinoline phosphomolybdic acid gravimetric method dissolved in aqua regia, it is simple, fast, low in cost and good in reproducibility. Features. Table 7 ω(MgO) / 10 -2

[0054]

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Abstract

The method comprises: a) placing the sample in a container; adding mixed agent and boiling 5-7 min to solve the sample; b) separation and precipitation, using EDTA volumetric method to measure the magnesia; c) filter, dropping the indicting liquid until the solution shows light red color; recording the volume of the dropped solution.

Description

technical field [0001] The invention relates to a method for determining magnesium oxide in phosphate rock. Background technique [0002] Aqua regia and alkali fusion are often used as solvents for decomposing samples in the determination of magnesium oxide in phosphate rock, and the operation is time-consuming and has a great impact on the analysis operators, which is not conducive to health and the process is complicated. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the prior art and provide a simple, fast, environmentally friendly and low-cost method for determining magnesium oxide in phosphate rock. [0004] A kind of method of measuring magnesium oxide in phosphate rock of the present invention is realized by following scheme: [0005] a. Put the sample in a container, add a mixed solvent and boil for 5-7 minutes to dissolve; [0006] b. Separation and precipitation, EDTA volumetric method carries out the mens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/77G01N21/83G01N21/79
Inventor 冯晓军柏中能
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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