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Method for measuring phosphorus content in high-carbon ferrochrome

A technology with high carbon ferrochromium and phosphorus content, applied in the measurement of color/spectral characteristics, etc., can solve problems such as high risk

Pending Publication Date: 2020-10-23
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring the phosphorus content in high-carbon ferrochrome, aiming at solving the technical problem that the chemical analysis of phosphorus content in high-carbon ferrochrome has a high risk of using sodium peroxide as a melting agent

Method used

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  • Method for measuring phosphorus content in high-carbon ferrochrome

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Experimental program
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specific Embodiment approach

[0018] 1. Experimental method

[0019] 1.1 Main instruments and reagents

[0020] 1.1.1 High temperature muffle furnace

[0021] 1.12 millionth balance

[0022] 1.1.3 Nitric acid (the ratio of nitric acid to water is 1:5)

[0023] 1.1.4 Bismuth nitrate: Weigh 5g of bismuth nitrate and dissolve it in 1L of boiling 1mol / L nitric acid solution.

[0024] 1.1.5 Ammonium molybdate-potassium sodium tartrate solution: 3% ammonium molybdate solution and 5% potassium sodium tartrate solution are mixed in equal volumes, and mixed immediately after use.

[0025] 1.1.6 Ascorbic acid-ethanol solution: Weigh 2g of ascorbic acid and dissolve it in 100ml of ethanol solution (the ratio of ascorbic acid to ethanol is 1:9), and prepare it immediately after use.

[0026] 1.2. Experimental method

[0027] Weigh 0.2000g of the sample into a paper tube containing 2g of boric acid + anhydrous sodium carbonate mixed flux, stir well, wrap it well, put it into a graphite crucible, and melt it in a m...

Embodiment 1

[0036] Weigh 0.2000g of high-carbon ferrochromium sample A into a paper tube containing 2g of boric acid + anhydrous sodium carbonate mixed flux, stir well, wrap it well, put it into a graphite crucible, and melt it in a muffle furnace at 900-950°C for 10 minute. Take it out and cool it, put it into a 250ml beaker filled with 70ml (the ratio of nitric acid and water is 1:5) nitric acid, heat and dissolve on the electric heating plate, after the sample is dissolved, filter it with a absorbent cotton filter into a 250ml volumetric flask, Dilute to volume with water and shake well.

[0037] Draw 25ml of the mother liquor into a 50ml volumetric flask, add 5ml of bismuth nitrate solution, 10ml of ammonium molybdate-potassium sodium tartrate solution, 10ml of ascorbic acid-ethanol solution, until the color develops, dilute with water to the scale and shake well, on the spectrophotometer, 680nm 3 cm cuvette, with water as a reference, measure the absorbance. Use the standard sample...

Embodiment 2

[0039] Weigh 0.2001g of high-carbon ferrochromium sample B into a paper tube containing 2g of boric acid + anhydrous sodium carbonate mixed flux, stir well, wrap it well, put it into a graphite crucible, and melt it in a muffle furnace at 900-950°C for 10 minute. Take it out and cool it, put it into a 250ml beaker filled with 70ml (the ratio of nitric acid and water is 1:5) nitric acid, heat and dissolve on the electric heating plate, after the sample is dissolved, filter it with a absorbent cotton filter into a 250ml volumetric flask, Dilute to volume with water and shake well.

[0040] Draw 25ml of the mother liquor into a 50ml volumetric flask, add 5ml of bismuth nitrate solution, 10ml of ammonium molybdate-potassium sodium tartrate solution, 10ml of ascorbic acid-ethanol solution, until the color develops, dilute with water to the scale and shake well, on the spectrophotometer, 680nm 3 cm cuvette, with water as a reference, measure the absorbance. Use the standard sample...

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Abstract

The invention provides a method for measuring the phosphorus content in high-carbon ferrochrome, and belongs to the technical field of metallurgical chemical analysis. The method comprises the following steps: taking a quantitative high-carbon ferrochrome sample, and adding a fluxing agent consisting of boric acid and anhydrous sodium carbonate for melting; dissolving the obtained frit with a nitric acid solution, and fixing the volume to serve as a mother liquor; taking a certain amount of the mother liquor, respectively adding a bismuth nitrate solution, an ammonium molybdate-potassium sodium tartrate mixed solution and an ascorbic acid solution into the mother liquor until color development, and fixing the volume again; coating a spectrophotometer with the solution with the constant volume, measuring the absorbance, and obtaining the phosphorus content according to the relationship between the absorbance and the phosphorus content. The method for measuring the phosphorus content inhigh-carbon ferrochrome adopts the mixed fluxing agent composed of boric acid and anhydrous sodium carbonate to replace a sodium peroxide fluxing agent in the prior art, dust stimulation and burning damage caused by the use of the sodium peroxide fluxing agent are avoided, combustion and explosion hidden dangers caused by the use of the sodium peroxide fluxing agent are also avoided, and the safety of measuring the phosphorus content in the high-carbon ferrochrome is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metallurgical chemical analysis, and more specifically relates to a method for measuring phosphorus content in high-carbon ferrochrome. Background technique [0002] High-carbon ferrochromium is an important alloy additive in steelmaking process. Accurate determination of phosphorus content in it plays an important role in controlling the composition of molten steel. Currently chemically analyzing the phosphorus content in high-carbon ferrochromium, using sodium peroxide to melt the sample, sodium peroxide dust can irritate the eyes and respiratory tract, corrode the nasal septum, and direct skin contact can cause burns, and it also has certain dangers. Organic or easily oxidizable substances form explosive mixtures, which can cause combustion or explosion when a small amount of water comes into contact with them. When exposed to moisture and acids, they will decompose and release oxygen to support combus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 李冬梅张伟郭强张腾飞
Owner XINXING DUCTILE IRON PIPES CO LTD
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