CN109596600B - Method for detecting total iron in iron ore powder - Google Patents
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- CN109596600B CN109596600B CN201811581007.1A CN201811581007A CN109596600B CN 109596600 B CN109596600 B CN 109596600B CN 201811581007 A CN201811581007 A CN 201811581007A CN 109596600 B CN109596600 B CN 109596600B
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Abstract
The invention provides a method for detecting total iron in iron ore powder, which comprises the following steps: (A1) sampling iron ore powder, diluting with a diluent, and mixing with a buffer; (A2) the mixture is arranged in an electrode, the mixture encloses a groove in the electrode, and the inner diameter of the groove is from R to R from top to bottom1Change to R2，R2＜R1And R is1Is the inner diameter of the electrode; (A3) and detecting the mixture by using an arc emission spectrometry to obtain the total iron content in the iron ore powder. The invention has the advantages of high accuracy, rapidness, low cost and the like.
Description
Technical Field
The invention relates to metal detection, in particular to a method for detecting total iron in iron ore powder.
Background
The iron content is an index directly determining the grade of ore, and in the actual mining, mineral separation and smelting, the iron content in the iron ore needs to be measured quickly in time, and then the most reasonable and effective production process is arranged according to different ore grades.
The prior art solves the problems that: there are two methods in the national standard for determining the total iron content in iron ore: GB/T6730.65-2009 titanium trichloride reduction potassium dichromate titration method and GB/T6730.66-2009 automatic potentiometric titration method, besides the common method, stannous chloride reduction potassium dichromate is usedTitration method. The method comprises digesting and filtering the sample, burning the residue, acidifying, melting, leaching, mixing the filtrate with the leaching solution to obtain the solution to be tested, adding reducing agent to obtain Fe3+Reduction to Fe2+Finally, oxidizing and titrating Fe by adopting potassium dichromate2+The iron content was calculated as the amount of potassium dichromate consumed. The whole process is complex and tedious, the consumed time is long, and the requirement on the chemical analysis skills of testers is high.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the method for detecting the total iron in the iron ore powder, which has high detection accuracy, is quick and has low cost.
The purpose of the invention is realized by the following technical scheme:
the method for detecting the total iron in the iron ore powder comprises the following steps:
(A1) sampling iron ore powder, diluting with a diluent, and mixing with a buffer;
(A2) the mixture is arranged in an electrode, the mixture encloses a groove in the electrode, and the inner diameter of the groove is from R to R from top to bottom1Change to R2，R2＜R1And R is1Is the inner diameter of the electrode;
(A3) and detecting the mixture by using an arc emission spectrometry to obtain the total iron content in the iron ore powder.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for directly measuring the iron ore powder is simple and quick, and the result is reliable;
2. a complicated sample digestion process is avoided, and inaccurate measurement results caused by incomplete digestion are reduced;
3. the use cost of the instrument is low;
4. the requirement on testing personnel is low, and the manual use cost is reduced.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a flowchart of a method for detecting total iron in iron ore powder according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a flowchart of a method for detecting total iron in iron ore powder according to an embodiment of the present invention, and as shown in fig. 1, the method for detecting total iron in iron ore powder includes the following steps:
(A1) sampling iron ore powder, diluting the iron ore powder by a diluent such as tungsten trioxide to dilute the Fe content in the sample, avoiding saturated self-absorption caused by overhigh Fe spectral intensity, balancing matrix difference caused by various iron ore matrixes and reducing matrix effect;
mixing with a buffer (e.g., a mixture of carbon and lithium carbonate);
(A2) the mixture is arranged in an electrode, the mixture encloses a groove in the electrode, and the inner diameter of the groove is from R to R from top to bottom1Change to R2，R2＜R1And R is1The inner diameter of the electrode, that is, the thickness of the mixture attached to the inner wall of the electrode becomes larger from top to bottom;
(A3) and detecting the mixture by using an arc emission spectrometry to obtain the total iron content in the iron ore powder.
In order to improve the detection accuracy, an internal standard substance is further contained in the buffer; total iron content
I1Is the characteristic line intensity of iron, I2Is the characteristic line intensity of the internal standard, and k, b are constants.
To improve the detection accuracy, further, the distance from the bottom of the groove to the top of the electrode
The proportionality constant K ∈ [0.5,1.5 ]]H is the depth of the electrode, m is the mass of the mixture filling the electrode, m1Is the mass of the mixture charged into the electrode.
Example 2:
an application example of the method for detecting total iron in the iron ore powder according to embodiment 1 of the present invention.
In this application example, the diluent was spectrally pure tungsten trioxide and the buffer was a mixture of 95% carbon and 5% lithium carbonate; WO3+C→WC+CO2WO with lower melting point and easy evaporation3Converting into WC difficult to evaporate, inhibiting W evaporation, and reducing diluent WO3Spectral interference of (a); the lithium carbonate is used for increasing the temperature of the arc flame and maintaining the stability of the arc flame; the groove is in the shape of an inverted spherical table, and the distance from the bottom of the groove to the top end of the graphite electrode
I.e., K is 0.5; detecting the total iron content by adopting an internal standard method
Claims (6)
1. The method for detecting the total iron in the iron ore powder comprises the following steps:
(A1) sampling iron ore powder, diluting with a diluent, and mixing with a buffer;
(A2) the mixture is arranged in an electrode, the mixture encloses a groove in the electrode, and the inner diameter of the groove is from R to R from top to bottom1Change to R2，R2< R1And R is1Is the inner diameter of the electrode;
(A3) detecting the mixture by using an arc emission spectrometry to obtain the total iron content in the iron ore powder;
the diluent is tungsten trioxide and the buffer is a mixture of carbon and lithium carbonate; WO3+C→WC+CO2Introduction of WO3Converting into WC, thereby inhibiting evaporation of W and reducing the diluent WO3Of the optical spectrum.
2. The method for detecting the total iron in the iron ore powder according to claim 1, wherein the method comprises the following steps: the buffer contains an internal standard substance; total iron content
，I1Is the characteristic line intensity of iron, I2Is the characteristic line intensity of the internal standard, and k, b are constants.
3. The method for detecting the total iron in the iron ore powder according to claim 1, wherein the method comprises the following steps: distance from bottom of the groove to top of the electrode
Constant of proportionality
H is the depth of the electrode, m is the mass of the mixture filling the electrode, m1Is the mass of the mixture charged into the electrode.
4. The method for detecting the total iron in the iron ore powder according to claim 1, wherein the method comprises the following steps: the buffer was a mixture of 95% carbon and 5% lithium carbonate.
5. The method for detecting the total iron in the iron ore powder according to claim 4, wherein the method comprises the following steps: the diluent is analytically or spectrally pure tungsten trioxide.
6. The method for detecting the total iron in the iron ore powder according to claim 1, wherein the method comprises the following steps: the groove is in the shape of an inverted spherical table.
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