CN115015469A - Method for detecting total iron content of steel slag - Google Patents
Method for detecting total iron content of steel slag Download PDFInfo
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- CN115015469A CN115015469A CN202210740599.7A CN202210740599A CN115015469A CN 115015469 A CN115015469 A CN 115015469A CN 202210740599 A CN202210740599 A CN 202210740599A CN 115015469 A CN115015469 A CN 115015469A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a method for detecting the total iron content of slag steel, which mainly comprises four steps of sample pretreatment, detection of the total iron content of iron-containing slag steel with the thickness of-3 mm, detection of the total iron content of residual iron and calculation of the total iron content of the slag steel. Crushing and magnetically separating a slag steel sample to obtain iron-containing slag steel with the thickness of-3 mm and residual iron; -3mm iron-containing slag steel is subjected to division, sampling and sample preparation treatment, and then the total iron content of the steel is measured by a chemical method; smelting and deoxidizing residual iron, and measuring the total iron content of the residual iron by using a direct-reading spectrometer after separating slag iron; and finally, calculating the total iron content of the slag steel according to the weight ratio of the iron-containing slag steel with the thickness of-3 mm to the residual iron. The invention solves the problem that the conventional chemical detection method cannot accurately determine the total iron content of the slag steel, and provides a basis for settlement of the slag steel.
Description
Technical Field
The invention belongs to the technical field of analysis and detection, and relates to a method for detecting the total iron content of slag steel.
Background
Steel slag is a major by-product and waste material produced in the steel-making process of steel mills. It is made up by using various oxides formed from silicon, manganese, phosphorus and sulfur impurities in pig iron and oxidizing them in the course of smelting process and making them react with flux to produce salts. The steel slag also contains 2-9% of iron, and the iron-containing material separated from the steel slag by magnetic separation is called slag steel.
The slag steel can be returned to the steel-making production, thereby realizing recycling. Because the slag steel supplied to the converter has more residual iron, the content of total iron in the slag steel cannot be effectively and accurately measured by a chemical inspection method (YB/T148-2015) and a steelmaking material balance calculation method, so that the settlement of the slag steel is lack of effective basis in a long term. It is necessary to find a method for accurately measuring and calculating the total iron content of a slag steel sample by adopting a proper detection method, and an effective basis is provided for slag steel settlement.
Disclosure of Invention
The invention aims to provide a detection method capable of accurately measuring the total iron content of slag steel aiming at the problems in the prior art.
Therefore, the invention provides a method for detecting the total iron content of slag steel, which comprises the following steps:
(1) sample pretreatment: taking a slag steel sample to be measured, weighing the mass of the slag steel sample to be measured, wherein the slag steel sample is generally large in particle size deviation and is unequal from 1-100 mm, crushing the slag steel sample step by using a coarse crusher and a fine crusher, magnetically selecting residual iron in the slag steel after each step of crushing, then screening, crushing oversize materials step by step again and magnetically selecting residual iron until all the residual iron and the iron-containing slag steel with different particle sizes are crushed to be below 3mm, finally obtaining residual iron with different particle sizes and iron-containing slag steel with the size of-3 mm, and weighing the mass of the iron-containing slag steel with the size of-3 mm and the mass of the residual iron;
(2) detecting the TFe content of the iron-containing slag steel with the thickness of-3 mm: carrying out division sampling on the-3 mm iron-containing slag steel, and determining the TFe content of the iron-containing slag steel by using a chemical detection method;
(3) detecting the TFe content of the residual iron: smelting residual iron by using a high-frequency furnace, adding an aluminum deoxidizer for deoxidation after the residual iron is molten, preventing secondary oxidation of molten iron, cooling after the residual iron is completely separated to obtain an iron ingot, weighing the mass of the obtained iron ingot, preparing a sample from the smelted iron ingot, and measuring the TFe content of the sample, thereby calculating the TFe content of the residual iron;
(4) calculating the TFe content of the whole slag steel: carrying out weighted average on the TFe content of the iron-containing slag steel with the thickness of-3 mm and the TFe content of residual iron, and further calculating to obtain the TFe content of the whole slag steel sample, wherein the TFe content is expressed by mass fraction, and the calculation formula is as follows:
in the formula: w (TFe) -TFe content of the slag steel in mass percent (%);
m0 mass of the slag steel sample to be measured, and the unit is gram (g);
m 1-3 mm, the unit is gram (g);
m 2-mass of residual iron, in grams (g);
m3 mass of iron ingot obtained by smelting residual iron, unit is gram (g);
the TFe content of w 1-3 mm iron-containing slag steel, the unit is mass percent (%);
w 2-TFe content of iron ingot, unit is mass percent (%).
Further, in the step (1), the slag steel samples to be measured comprise a plurality of groups, each group of samples is not less than 10kg, and TFe content measurement is respectively carried out on each group of samples; and (4) calculating a weighted average value of the TFe contents of the obtained slag steel samples of each group to serve as the TFe content value of the slag steel sample.
Further, in the step (1), the slag steel sample to be detected comprises 3-5 groups.
Further, in the step (3), the TFe content of the iron ingot is measured by a direct-reading spectrometer.
In the invention, the chemical detection method can adopt the chemical method for determining the TFe content in the industry, such as the strong base separation EDTA titration method in YB/T148-2015 method for determining the content of total iron in steel slag.
Compared with the prior art, the invention has the following beneficial effects:
(1) the chemical detection method cannot accurately determine the total iron content of the slag steel, but the physical detection method and the chemical detection method are combined, so that the total iron content of the slag steel can be more accurately determined, and a basis is provided for settlement of the slag steel;
(2) the method utilizes a direct-reading spectrometer to measure the total iron content of the magnetically-separated iron ingot; chemical detection is carried out on undersize products after the samples are prepared by division, and less chemical reagents are used, so that the pollution to human bodies and the environment can be reduced;
(3) the method is accurate, reduces errors through multiple groups of measurement and weighted average, and effectively improves the accuracy of detecting the total iron content of the slag steel.
Detailed Description
The invention is further described below by means of specific examples.
A method for detecting the total iron content of slag steel comprises the following steps:
three 10kg slag steel parts are randomly taken from a slag steel pile and numbered as a No. 1 sample, a No. 2 sample and a No. 3 sample in sequence, and the slag steel is granular, so that 10kg cannot be accurately taken, and the weight of the three parts of the slag steel is 10002g, 10011g and 10006g respectively. And crushing the three samples by using a coarse fraction crusher, selecting residual iron by using a magnet, screening by using a 20mm square-hole sieve, and continuously crushing oversize materials by using the coarse fraction crusher until all the oversize materials pass through the 20mm square-hole sieve. And crushing and magnetically separating the obtained-20 mm slag steel by using a fine particle size crusher until the slag steel completely passes through a 10mm square-hole sieve. The obtained-10 mm slag steel is crushed and magnetically separated by a fine fraction crusher until the slag steel completely passes through a 3mm square-hole sieve, and finally the residual iron and the-3 mm iron-containing slag steel with different grain sizes are obtained and respectively weighed, and the results are shown in the following table 1.
TABLE 1 residual iron and-3 mm iron-containing slag Steel weight/g of three samples
The iron-containing steel slag with the thickness of-3 mm is uniformly mixed according to a conventional sample, 100 g of the sample is divided and sampled, the sample is finely ground to 120 meshes by vibration, 10 g of the sample is divided and sampled, and the total iron content of three samples is determined by a strong base separation EDTA titration method in YB/T148-2015 method for determining the total iron content in the steel slag, wherein the results are 50.4%, 43.5% and 40.9% respectively. Smelting residual iron by using a high-frequency furnace, adding an aluminum deoxidizer to separate slag and iron, cooling after the slag and iron are completely separated to obtain an iron ingot and slag, and weighing the iron ingot to obtain three samples, wherein the weights of the iron ingot are 2601.5g, 2759.6g and 2707.3 respectively. And (3) preparing a sample of the iron ingot, and measuring the total iron content by using a direct-reading spectrometer to obtain three parts of samples of the iron ingot, wherein the total iron content is 98.56%, 98.57% and 98.59%. The total iron content of each of the three samples was calculated as shown in table 2 below.
TABLE 2 Total iron content/% of residual iron and-3 mm iron-containing slag Steel of three samples
And (3) carrying out weighted average on the total iron content of the three samples to obtain the total iron content of the slag steel as follows: 56.6 percent.
Claims (4)
1. The method for detecting the total iron content of the slag steel is characterized by comprising the following steps of:
(1) sample pretreatment: taking a slag steel sample to be measured, weighing the mass of the slag steel sample to be measured, crushing the slag steel sample step by using a coarse crusher and a fine crusher, carrying out magnetic separation on residual iron in the slag steel after each step of crushing, then carrying out screening, crushing oversize products step by step again and carrying out magnetic separation on the residual iron until all the residual iron is crushed to be below 3mm, finally obtaining residual iron and iron-containing slag steel with different grain sizes, and respectively weighing the mass of the iron-containing slag steel with the grain size of-3 mm and the mass of the residual iron;
(2) detecting the TFe content of the iron-containing slag steel with the thickness of-3 mm: carrying out division sampling on the-3 mm iron-containing slag steel, and determining the TFe content of the iron-containing slag steel by using a chemical detection method;
(3) detecting the TFe content of the residual iron: smelting residual iron by using a high-frequency furnace, deoxidizing after the residual iron is molten, cooling after the residual iron is completely separated to obtain an iron ingot, weighing the mass of the obtained iron ingot, preparing a sample of the smelted iron ingot, and measuring the TFe content of the sample, thereby calculating the TFe content of the residual iron;
(4) calculating the TFe content of the whole slag steel: carrying out weighted average on the TFe content of the iron-containing slag steel with the thickness of-3 mm and the TFe content of residual iron, and further calculating to obtain the TFe content of the whole slag steel sample, wherein the TFe content is expressed by mass fraction, and the calculation formula is as follows:
in the formula: w (TFe) -TFe content of the slag steel, wherein the unit is mass percent;
m0 mass of the slag steel sample to be measured, and the unit is gram;
m 1-3 mm, the unit is gram, of the iron-containing slag steel;
m 3-mass of iron ingot obtained by smelting residual iron, unit is gram;
the TFe content of w 1-3 mm iron-containing slag steel, the unit is mass percent;
w 2-TFe content of the iron ingot, the unit is mass percent.
2. The method for detecting the total iron content of the slag steel according to claim 1, wherein the method comprises the following steps: in the step (1), the slag steel sample to be measured comprises a plurality of groups, each group of samples is not less than 10kg, and TFe content measurement is respectively carried out on each group of samples; and (4) calculating a weighted average value of the TFe contents of the obtained slag steel samples of each group to serve as the TFe content value of the slag steel sample.
3. The method for detecting the total iron content of the slag steel according to claim 1, wherein the method comprises the following steps: in the step (1), the slag steel sample to be detected comprises 3-5 groups.
4. The method for detecting the total iron content of the slag steel according to claim 1, characterized by comprising the following steps: and (3) measuring the TFe content of the iron ingot by using a direct-reading spectrometer.
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Citations (7)
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| CN107159426A (en) * | 2017-04-27 | 2017-09-15 | 酒泉钢铁(集团)有限责任公司 | A kind of slag is secondary to select iron method |
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| CN110082249A (en) * | 2019-03-07 | 2019-08-02 | 中冶节能环保有限责任公司 | A kind of measuring method of steel slag original metal in the dreg iron content |
| CN111122562A (en) * | 2020-01-21 | 2020-05-08 | 包头钢铁（集团）有限责任公司 | Method for determining TFe content in steel slag magnetic separation powder |
| CN113009102A (en) * | 2021-02-26 | 2021-06-22 | 柳州钢铁股份有限公司 | Method for determining composition of scrap and processing equipment for detecting composition sample of scrap |
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- 2022-06-28 CN CN202210740599.7A patent/CN115015469A/en active Pending
Patent Citations (7)
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| CN110082249A (en) * | 2019-03-07 | 2019-08-02 | 中冶节能环保有限责任公司 | A kind of measuring method of steel slag original metal in the dreg iron content |
| CN111122562A (en) * | 2020-01-21 | 2020-05-08 | 包头钢铁（集团）有限责任公司 | Method for determining TFe content in steel slag magnetic separation powder |
| CN113913621A (en) * | 2020-11-13 | 2022-01-11 | 内蒙古君成科技有限公司 | Method for preparing Al-Si-Fe alloy by using high-aluminum coal gangue and purifying Al-Si-Fe alloy in grades |
| CN113009102A (en) * | 2021-02-26 | 2021-06-22 | 柳州钢铁股份有限公司 | Method for determining composition of scrap and processing equipment for detecting composition sample of scrap |
| CN113324828A (en) * | 2021-05-19 | 2021-08-31 | 安徽长江钢铁股份有限公司 | Remelting and ingot casting sample preparation and component detection method for ferroalloy |
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