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Method for determining phosphorus content in iron ore by bismuth-phosphorus-molybdenum blue

A technology for iron ore and phosphorus content, applied in the field of chemical detection, can solve the problems of high cost, long heating time, large power consumption, etc., to ensure detection accuracy and precision, good repeatability, and reduce costs Effect

Inactive Publication Date: 2020-09-11
MCC NORTH (DALIAN) ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing determination standards, patents and literatures for the determination of phosphorus content in iron ore are basically alkali fusion samples. The sample needs to be heated to above 900°C with a muffle furnace, which takes a long time to heat up and consumes a lot of power

Method used

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  • Method for determining phosphorus content in iron ore by bismuth-phosphorus-molybdenum blue
  • Method for determining phosphorus content in iron ore by bismuth-phosphorus-molybdenum blue
  • Method for determining phosphorus content in iron ore by bismuth-phosphorus-molybdenum blue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Determination of Phosphorus Content in Standard Samples of Zhaocheng Iron Mine Ore

[0082] ——(Zhaocheng Iron Mine YSBC 15707-2003, P(%)=0.032)

[0083] 1) Preparation of relevant detection reagents:

[0084] sulfuric acid:

[0085] Slowly inject 100mL of concentrated sulfuric acid into 200mL of water while stirring with a glass rod to dissipate heat;

[0086] Nitric acid: commercially available, the concentration is 70%;

[0087] Hydrochloric acid: commercially available, the concentration is 38%;

[0088] Sodium hydroxide solution: prepared by dissolving 40g of sodium hydroxide in 100mL of water.

[0089] Potassium Sodium Tartrate Solution: Prepared by dissolving 5g of Potassium Sodium Tartrate in 100mL of water.

[0090] Bismuth nitrate solution: weigh 9.309 bismuth nitrate [Bi(NO 3 ) 3 ·5H 2 O], add 25ml of nitric acid, heat to dissolve, add about 100ml of water, boil to drive off nitrogen oxides, add 100ml of sulfuric acid, cool to room temperature, transfe...

Embodiment 2

[0131] Determination of phosphorus content in iron ore standard samples

[0132] ——(iron ore GSB03-2583-2010, P(%)=0.099)

[0133] 1) Preparation of relevant detection reagents:

[0134] The preparation of related detection reagents is the same as the preparation of related detection reagents in Example 1.

[0135] 2) Detection and calculation of phosphorus content in the sample:

[0136] S2, sample dissolution:

[0137] Sample dissolving is identical with the S2 step in embodiment 1;

[0138] S3, filter:

[0139] Filter the S2 solution while it is hot, and use a 100mL volumetric flask to take over, and control the volume of the solution in the volumetric flask to not exceed 50mL.

[0140] S4. Acidity adjustment:

[0141] Acidity regulation is identical with step S4 among the embodiment 1;

[0142] S5, color rendering:

[0143] Color development is the same as step S5 in Example 1;

[0144] S6. Measurement:

[0145] Measurement is identical with step S6 in embodiment...

Embodiment 3

[0154] Determination of phosphorus content in iron ore standard samples

[0155] ——(Hematite 7011, P(%)=0.323)

[0156] 1) Preparation of relevant detection reagents:

[0157] The preparation of related detection reagents is the same as the preparation of related detection reagents in Example 1.

[0158] 2) Detection and calculation of phosphorus content in the sample:

[0159] S2, sample dissolution:

[0160] Sample dissolution is the same as step S2 in Example 1;

[0161] S3, filter:

[0162] Filter the S2 solution while it is hot, take it up with a 100mL volumetric flask, and dilute to volume after filtering to obtain the mother liquor. Pipette 10mL of mother liquor to a 100mL volumetric flask;

[0163] S4. Acidity adjustment:

[0164] Acidity regulation is identical with step S4 among the embodiment 1;

[0165] S5, color rendering:

[0166] Color development is the same as step S5 in Example 1;

[0167] S6. Measurement:

[0168] Measurement is identical with ste...

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Abstract

The invention relates to a method for determining phosphorus content in iron ore by bismuth-phosphorus-molybdenum blue, and the method comprises the following steps: weighing 0.1-0.25 g of sample, putting into a beaker, adding hydrochloric acid, heating to dissolve for 3-5 minutes, adding nitric acid and sulfuric acid, evaporating to a wet salt state, taking down, slightly cooling, and adding water to a scale of 20mL to obtain a solution; then filtering; after the filtering, adding a sodium hydroxide solution, sulfuric acid and a potassium sodium tartrate solution for acidity adjustment; thenadding a bismuth nitrate solution, an ammonium molybdate solution and an ascorbic acid-hydroxylamine hydrochloride mixed solution for color development, and diluting to a constant volume of 100 mL ofa mother solution; and finally, measuring and calculating the phosphorus content in the sample according to a bismuth-phosphorus-molybdenum blue light intensity method in the prior art. The method hasthe advantages that the concentrated hydrochloric acid, the concentrated nitric acid and the concentrated sulfuric acid are uniquely adopted to dissolve the sample in the beaker, the detection cost is remarkably reduced and the detection efficiency is improved while the detection accuracy and precision are ensured, and the reproducibility is good; the device is suitable for laboratories of various levels.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for measuring phosphorus content in iron ore with bismuth phosphomolybdenum blue. Background technique [0002] Phosphorus and sulfur are harmful elements in iron ore, and their existence affects the quality of steel. At present, when the phosphorus content in iron ore is low, the bismuth phosphomolybdenum blue spectrophotometric method is basically used for determination. For example, the invention patent with the application number CN 201010107255.X. discloses a "method for determining phosphorus content by bismuth phosphomolybdenum blue-sulfuric acid photometry". The determination steps of this method are: weigh 0.25 g of the sample, put it into a platinum crucible containing about 2 g of mixed flux, put it in a muffle furnace at 1000 ° C for 10 minutes and take it out, clean the outside of the platinum crucible, and then put it into a hot In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31G01N1/28
CPCG01N21/78G01N21/31G01N1/28
Inventor 孟光栋刘晓辰韩汝超王莉芃金宇峰
Owner MCC NORTH (DALIAN) ENG TECH CO LTD
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