CN111707518A - Sample for chemical analysis of low-carbon ferrochrome and sample preparation method - Google Patents
Sample for chemical analysis of low-carbon ferrochrome and sample preparation method Download PDFInfo
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- CN111707518A CN111707518A CN202010707785.1A CN202010707785A CN111707518A CN 111707518 A CN111707518 A CN 111707518A CN 202010707785 A CN202010707785 A CN 202010707785A CN 111707518 A CN111707518 A CN 111707518A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
Abstract
The application relates to the field of steel smelting, in particular to a sample for chemical analysis of low-carbon ferrochrome and a sample preparation method. The method comprises the following steps: crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction so as to gradually reduce the particle size of the low-carbon ferrochrome samples; and then screening the low-carbon ferrochrome sample crushed by the fourth grade, and taking a test sample with the grain size of less than or equal to 1.6 mm. The method provided by the application not only can solve various problems caused by sample preparation by a drilling method in the prior art, but also can greatly reduce the difficulty of sample preparation of the sample for the chemical analysis of the low-carbon ferrochrome and save the sample preparation time. According to the sample preparation method for the low-carbon ferrochrome sample for chemical analysis, a batch of low-carbon ferrochrome samples are broken step by step according to the first size fraction, the second size fraction, the third size fraction and the fourth size fraction within 10 minutes, so that the preparation time of the low-carbon ferrochrome sample for chemical analysis is greatly shortened.
Description
Technical Field
The application relates to the field of steel smelting, in particular to a sample for chemical analysis of low-carbon ferrochrome and a sample preparation method.
Background
The low-carbon ferrochrome is an important material in steel smelting, and can obviously improve the oxidation resistance of the steel and increase the corrosion resistance of the steel when added into the steel.
The chemical components of the low-carbon chromite are greatly different, so that the chemical components of the low-carbon chromite need to be detected when the low-carbon chromite is used.
The low-carbon ferrochrome chemical composition test needs to be carried out according to the collection and preparation of samples for chemical analysis of GBT 4010-2015 ferroalloy.
However, the low-carbon ferrochrome mainly comprises chromium and iron, and also comprises impurities such as carbon, silicon, sulfur, phosphorus and the like. The carbon content in the low-carbon ferrochrome is generally 0.15-0.5%. The low-carbon ferrochrome has the characteristics of high hardness and wear resistance, which causes great sample preparation difficulty of a sample for chemical analysis of the low-carbon ferrochrome.
The preparation method of the sample for the conventional low-carbon ferrochrome chemical analysis at present comprises the following steps:
randomly selecting drilling points on the cross section of a sample block, adopting a flowing water cooling drill bit in the drilling process, wherein the sample drilling time of each block is not too long, preventing the sample from being overheated and oxidized, drying the sample when the sample is wet, controlling the temperature below 100 ℃, sieving the dried sample by using a 0.154mm sieve to remove undersize matters so as to remove foreign impurities, or adopting a magnetic adsorption method to remove the foreign impurities. For a sample composed of a graded lot, the grinding time is not more than 15s each time, the grain size of the sample after grinding is not more than 1.6mm, and then the reduction is performed, the weight of each test sample for chemical analysis should not be less than 50 g.
However, the conventional sample drilling and preparing method has many disadvantages:
for example, since a sample needs to be drilled into a sample block, a sample cannot be prepared from a bulk material or a sample having a particle size that does not satisfy the drilling requirement, and thus, the composition of the sample tends to vary. And the cross section of the sample block is randomly selected, but the sample has unevenness, so that the drill bit is easy to collapse to influence the components of the sample. In addition, the drill bit needs to be cooled by flowing water, the drilling time is strictly controlled, and the excessively long drilling time easily causes the overheating and oxidation of the sample, thereby influencing the component result.
In addition, the conventional method also needs to grind the sample, because the low-carbon ferrochrome alloy has certain toughness, the sample grinding machine has higher requirement, a tungsten carbide grinding bowl needs to be adopted for grinding, the grinding time is specified, the grinding time exceeds the specified time, the sample is easy to fail to meet the test requirement, and the sample usually shows that the particles do not reach the standard and are in a round shape.
Disclosure of Invention
An object of the embodiments of the present application is to provide a sample for chemical analysis of low-carbon ferrochrome and a sample preparation method, which aim to solve the problem that component deviation is easily caused by sample preparation of the existing sample for chemical analysis of low-carbon ferrochrome.
In a first aspect, the present application provides a sample preparation method for a sample for chemical analysis of low-carbon ferrochrome, comprising:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction so as to gradually reduce the particle size of the low-carbon ferrochrome samples;
then screening the low-carbon ferrochrome sample crushed by the fourth grade, and taking a test sample with the grain size of less than or equal to 1.6 mm;
the first size fraction is in the range of 13 mm-17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
In other embodiments of the present application, the first size fraction is in the range of 15mm to 17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
In other embodiments of the present application, the step of gradually crushing a batch of low-carbon ferrochrome samples according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction includes:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction by adopting a crusher;
the jaw plate material of the crusher comprises tungsten carbide.
In other embodiments of the present application, the step of screening the crushed low-carbon ferrochrome sample includes:
firstly, screening a crushed low-carbon ferrochrome sample by using a sample screen, and taking undersize products, wherein the particle size of the undersize products is less than or equal to 1.6 mm;
optionally, the undersize is also subjected to magnetic separation to remove impurities.
In other embodiments of the present application, the undersize weighs not less than 70 g.
In other embodiments of the present application, the step of screening the crushed low-carbon ferrochrome sample by using the sample screen includes:
screening the crushed low-carbon ferrochrome sample by using a 20-mesh sample screen, and taking undersize products.
In other embodiments of the present application, the weight of the sample having a particle size of 1.6mm or less is not less than 50 g.
In other embodiments of the present application, the step of gradually crushing a batch of low-carbon ferrochrome samples according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction includes:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction and a second size fraction, uniformly mixing and dividing the crushed materials, and then taking part of the materials to be crushed in a third size fraction and a fourth size fraction in sequence.
In other embodiments of the present application, the blending and condensing includes:
uniformly mixing and dividing the crushed materials, and taking at least two parts of materials to respectively carry out crushing of a third size fraction and a fourth size fraction in sequence;
or, the mixing and dividing comprises:
uniformly mixing and dividing the crushed materials, and taking two parts of materials to respectively carry out crushing of a third size fraction and a fourth size fraction in sequence; wherein the first material sample is not less than 2kg and the second material sample is not less than 7 kg.
In a second aspect, the present application provides a sample for chemical analysis of low-carbon ferrochrome, which is prepared by the method described above.
The sample for the chemical analysis of the low-carbon ferrochrome and the sample preparation method provided by the embodiment of the application have the beneficial effects that:
according to the method, a batch of low-carbon ferrochrome samples are broken step by step according to the first size fraction, the second size fraction, the third size fraction and the fourth size fraction, so that the samples can be completely broken, and component deviation is avoided. And then screening the crushed low-carbon ferrochrome sample, and taking the sample with the particle size of less than or equal to 1.6mm, so that the sample can be effectively ensured to meet the detection requirement. Compared with the method for drilling the sample in the prior art, the method avoids component deviation caused by manually selecting the sample in the drilling operation, avoids the risk of manual intervention, and can reflect the quality condition of the material more truly and accurately. In addition, the method does not need to adopt a drill bit for sampling, and solves the problems that in the prior art, the drill bit needs to be cooled in running water, the requirement on the drilling time is strictly controlled, and the too long drilling time easily causes the overheating and oxidation of the sample, thereby influencing the ingredient result. In addition, the method does not need to grind the sample subsequently, reduces grinding steps, and solves the problem that particles are not up to standard and form a round shape due to grinding of the sample in the prior art. The method provided by the application not only can solve the problems, but also can greatly reduce the difficulty of sample preparation of the sample for the chemical analysis of the low-carbon ferrochrome and save the sample preparation time. According to the sample preparation method for the low-carbon ferrochrome chemical analysis sample, a batch of low-carbon ferrochrome samples are broken step by step according to the first size fraction, the second size fraction, the third size fraction and the fourth size fraction within 10 minutes, so that the preparation time of the low-carbon ferrochrome chemical analysis sample is greatly shortened.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present application.
The embodiment of the application provides a sample preparation method of a sample for chemical analysis of low-carbon ferrochrome, which comprises the following steps:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction so as to gradually reduce the particle size of the low-carbon ferrochrome samples;
then screening the low-carbon ferrochrome sample crushed by the fourth grade, and taking a test sample with the grain size of less than or equal to 1.6 mm;
the first size fraction is in the range of 13 mm-17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
According to the method, a batch of low-carbon ferrochrome samples are gradually crushed according to the first size fraction, the second size fraction, the third size fraction and the fourth size fraction, so that the samples can be completely crushed, and the component deviation is avoided. And then screening the crushed low-carbon ferrochrome sample, and taking the sample with the particle size of less than or equal to 1.6mm, so that the sample can be effectively ensured to meet the detection requirement. Compared with the method for drilling the sample in the prior art, the method avoids component deviation caused by manually selecting the sample in the drilling operation, avoids the risk of manual intervention, and can more truly and accurately reflect the real quality condition of the material.
Furthermore, the method does not need to adopt a drill bit for sampling, so that the problems that in the prior art, the drill bit needs to be cooled in running water, the requirement on the drilling time is strictly controlled, and the overheating and oxidation of the sample are easily caused due to the overlong drilling time, so that the component result is influenced are solved.
Further, compared with the conventional method in the prior art, the method provided by the application comprises the steps of crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction; and then screening the crushed low-carbon ferrochrome sample, and taking the sample with the grain size of less than or equal to 1.6mm to obtain the sample. Grinding is not needed, and grinding steps are reduced. The problem of prior art need grind the sample, because low carbon ferrochrome has certain toughness, require to the model grinder higher, need adopt tungsten carbide mill alms bowl to grind, and grind time stipulate, cause the sample to reach the requirement of testing (granule is not up to standard, becomes the reunion) easily is solved.
Furthermore, the method provided by the application not only can solve the problems, but also can greatly reduce the difficulty of sample preparation of the sample for the chemical analysis of the low-carbon ferrochrome and save the sample preparation time. According to the sample preparation method for the low-carbon ferrochrome chemical analysis sample, a batch of low-carbon ferrochrome samples are broken step by step according to the first size fraction, the second size fraction, the third size fraction and the fourth size fraction within 10 minutes, so that the preparation time of the low-carbon ferrochrome chemical analysis sample is greatly shortened.
In some embodiments of the present application, a batch of low carbon ferrochrome samples is broken down in steps according to a first fraction, a second fraction, a third fraction, and a fourth fraction.
Further optionally, the first size fraction is in the range of 13mm to 17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
The low-carbon ferrochrome sample can be effectively crushed by controlling the first size fraction within the range of 13-17 mm, the second size fraction within the range of 7-8 mm, the third size fraction within the range of 2-4 mm and the fourth size fraction within the range of 0.5-0.9 mm, and the crushing time is controlled within 10 minutes.
Further optionally, the first size fraction is in the range of 15mm to 17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
The low-carbon ferrochrome sample can be effectively crushed by controlling the first size fraction within the range of 15-17 mm, the second size fraction within the range of 7-8 mm, the third size fraction within the range of 2-4 mm and the fourth size fraction within the range of 0.5-0.9 mm, and the crushing time is controlled within 7.5 minutes.
In some embodiments of the present application, the first size fraction is 15 mm; the second size fraction is 8 mm; the third size fraction is 3 mm; the fourth fraction was 0.5 mm.
Controlling the first size fraction to be 15 mm; the second size fraction is 8 mm; the third size fraction is 3 mm; the fourth size fraction is 0.5mm, so that the low-carbon ferrochrome sample can be effectively crushed, and the crushing time is controlled within 5.5 minutes.
Further, the step of crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction comprises the following steps:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction by adopting a crusher;
the jaw plate material of the crusher comprises tungsten carbide.
The low-carbon ferrochrome mainly comprises chromium and iron, and also comprises impurities such as carbon, silicon, sulfur, phosphorus and the like. The carbon content in the low-carbon ferrochrome is generally 0.15-0.5%.
The low-carbon ferrochrome has the characteristics of high hardness and wear resistance, so that the low-carbon ferrochrome is not easy to break. In an embodiment of the application, the jaw plate material of the crusher used comprises tungsten carbide. Because the hardness of the tungsten carbide is extremely high, the low-carbon ferrochrome can be effectively crushed.
The specific structure of the crusher can be selected from the crusher structures commonly used in the field.
In some embodiments, the crushing of the low carbon ferrochrome to the corresponding grade of particle size is achieved by adjusting the gap between the jaws of the crusher.
Particularly, adjust the scale that first grade corresponds with the breaker, the distance that the jaw clearance adjustment corresponds for first grade, and artifical material is put in slowly with the sample shovel, when having the material in the breaker, stops to put in, just puts in after the material breakage finishes, makes its abundant breakage, accomplishes the breakage of first grade promptly.
Exemplarily, adjust the breaker to 15mm scale, the jaw clearance is adjusted to 15mm, and the manual work is put in the material with sample shovel slowly, when having the material in the breaker, stops to put in, just puts in after the material breakage finishes, makes its abundant breakage, accomplishes the breakage of first size fraction promptly.
And further, crushing the material crushed in the first size fraction in a second size fraction.
Particularly, adjust the scale that the second grade corresponds with the breaker, the distance that the second grade corresponds is adjusted to the jaw clearance, and artifical material is put in slowly with the sample shovel, when having the material in the breaker, stops to put in, just puts in after finishing to the material breakage, makes its abundant breakage, accomplishes the breakage of second grade promptly.
Exemplarily, adjust the breaker to 8mm scale, the jaw clearance is adjusted to 8mm, and the manual work is put in the material with sample shovel slowly, when having the material in the breaker, stops to put in, just puts in after the material breakage finishes, makes its abundant breakage, accomplishes the breakage of second size fraction promptly.
After the first size fraction and the second size fraction are broken, the coarse breaking of the sample is equivalently completed, and the whole batch of samples are broken completely, so that the obtained sample components are relatively uniform, and the problem of component deviation during subsequent chemical component analysis can be effectively solved.
Further, in some embodiments of the present application, the step of progressively crushing a batch of low-carbon ferrochrome samples according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction comprises:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction and a second size fraction, uniformly mixing and dividing the crushed materials, and then taking part of the materials to be crushed in a third size fraction and a fourth size fraction in sequence.
Through carrying out mixing division to the material after first size fraction, the second size fraction is broken step by step, then get partial material and carry out third size fraction, fourth size fraction breakage in proper order, can further improve the homogeneity of material, avoid the composition deviation, reduce the broken material weight of third size fraction, fourth size fraction moreover.
The reason is that the samples for subsequent chemical analysis do not need to be many, the materials are homogenized by the early-stage first-grade and second-grade crushing, and the subsequent mixing and division can reduce the subsequent crushing workload, further reduce the jaw plate crushing pressure of the crusher and further improve the sample preparation efficiency.
In some embodiments of the present application, the blending reduction comprises:
and after uniformly mixing and dividing the crushed materials, taking at least two parts of materials, and respectively and sequentially crushing the materials in a third size fraction and a fourth size fraction.
After the crushed materials are uniformly mixed and divided, at least two parts of materials are taken to be sequentially crushed in a third size fraction and a fourth size fraction respectively, so that at least two parts of materials can be obtained, at least two repeated tests can be performed during subsequent chemical analysis, and the precision is further improved.
In some embodiments of the present application, the blending reduction comprises:
uniformly mixing and dividing the crushed materials, and taking two parts of materials to respectively carry out crushing of a third size fraction and a fourth size fraction in sequence; wherein the first material sample is not less than 2kg and the second material sample is not less than 7 kg.
Crushing two materials in a third size fraction and a fourth size fraction in sequence respectively; wherein, the first part material sample is no less than 2kg, and the second part material is no less than 7kg, can obtain the sample with different samples to contrast when subsequent chemical analysis, verify repeatability, improve the precision.
It should be noted that the above step of mixing and dividing can be performed by using a manual divider commonly used in the art.
Further, the materials which are crushed step by step through the first size fraction, the second size fraction, the third size fraction and the fourth size fraction are screened, and samples with the particle size being less than or equal to 1.6mm are taken.
Because the international standard of the sample for the chemical analysis of the low-carbon ferrochrome requires the sample with the grain size less than or equal to 1.6mm, the material which is crushed step by the first grain size, the second grain size, the third grain size and the fourth grain size is screened, and the sample with the grain size less than or equal to 1.6mm is taken, so that the international requirement can be met.
Further, the step of screening the crushed low-carbon ferrochrome sample comprises the following steps:
screening the crushed low-carbon ferrochrome sample by using a sample screen, and taking undersize products, wherein the grain size of the undersize products is less than or equal to 1.6 mm.
And screening the crushed low-carbon ferrochrome sample by using a sample screen, and taking undersize to obtain a sample with a required particle size.
And further, carrying out magnetic separation on the undersize products to remove impurities.
The impurities in the particles can be removed by carrying out magnetic separation on the undersize products, so that the stability of the sample is ensured. Furthermore, the magnetic separation is to discard foreign impurities which cannot be adsorbed by a magnet, so that the cleanness of the sample is improved, and the stability of subsequent sample detection is ensured.
Further, the weight of the undersize is not less than 70 g.
Furthermore, the weight of the sample with the grain diameter less than or equal to 1.6mm is not less than 50 g.
The weight of undersize materials is not less than 70g, so that the weight of a sample with the subsequent particle size of not more than 1.6mm can be ensured to be not less than 50g after the subsequent magnetic separation. So that the material with enough weight is used as a sample to meet the requirements of the collection and preparation of the sample for chemical analysis of GBT 4010-.
Further, the step of screening the crushed low-carbon ferrochrome sample by using a sample screen comprises the following steps:
screening the crushed low-carbon ferrochrome sample by using a 20-mesh sample screen, and taking undersize products.
The particle size of the 20-mesh sample sieve is 0.850 mm. And screening the crushed low-carbon ferrochrome sample by using a 20-mesh sample screen, and taking undersize products, so that the particle size of the undersize products can meet the requirement of a chemical analysis sample. Through many times of data contrast tests, after using 20 mesh (0.850mm) sample sieve to sieve the sample, the subsieve fraction granule has not only satisfied the chemical examination requirement, compares prior art and makes the granularity size through grinding and be less than or equal to 1.6mm, and the method of this application can further improve the stability of sample, reduces the sample to low carbon ferrochrome simultaneously and grinds the appearance work, has stopped to cause the sample to can't reach the problem that the chemical examination requirement (the granule is not up to standard (the standard is less than or equal to 1.6mm), becomes the reunion because of grinding the appearance).
Further, when the fourth particle size is broken, the particle size slightly is less than the screening particle size here, this is because during the breakage, when the material drops from between the jaw board clearance, probably extrudees the jaw board and causes slightly to be greater than the material in jaw board clearance and drops, consequently sets up the broken particle size of fourth grade and is less than the screen cloth particle size, can reduce the material total amount of follow-up screen cloth screening, raises the efficiency, further guarantees the sample particle size stability of follow-up obtaining.
In some embodiments of the application, after the crushed low-carbon ferrochrome sample is screened by using a 20-mesh sample screen, the weight of the undersize should be ensured to be not less than 80g, so that 70g of the undersize can be taken out, and after magnetic separation, the residual amount is not less than 50 g.
If the undersize is less than 70g (because the sample after magnetic separation needs not less than 50g, enough samples need to be reserved for magnetic separation), the oversize is continuously utilized to carry out 0.5mm size fraction crushing until the undersize sample amount meets the requirement of being capable of taking at least 70 g.
The method greatly reduces the sample preparation difficulty of the sample for the chemical analysis of the low-carbon ferrochrome and shortens the sample preparation time of the sample for the chemical analysis of the low-carbon ferrochrome.
Some embodiments of the present application further provide a sample for chemical analysis of low-carbon ferrochrome, which is prepared by the sample preparation method for the sample for chemical analysis of low-carbon ferrochrome provided by the foregoing embodiments.
The low-carbon ferrochrome sample prepared by the method can meet the sample requirements of the collection and preparation of GBT 4010-.
The features and properties of the present application will be described in detail below with reference to examples and comparative examples.
Examples 1 to 8
Providing a sample for chemical analysis of low-carbon ferrochrome, and preparing the sample according to the following steps:
s1, adjusting the crusher to a first size corresponding scale, adjusting the gap between the jaw plates to a first size corresponding distance, manually and slowly putting the material by using a sample shovel, stopping putting when the material exists in the high-strength crusher, and putting after the material is crushed, so that the material is fully crushed.
S2, adjusting the crusher to the position where the second size fraction corresponds to the scale, adjusting the gap between the jaw plates to the distance corresponding to the second size fraction, manually and slowly putting the material by using the sample shovel, stopping putting when the material exists in the crusher, and putting after the material is crushed, so that the material is fully crushed.
S3, mixing and dividing
Firstly, the material crushed in the step S2 is subjected to division through a manual bisecting device, one part of sample is not less than 2kg after division, and the other part of sample is not less than 7kg and is continuously crushed.
S4, adjusting the crusher to a third grade corresponding scale, adjusting the gap between the jaw plates to a third grade corresponding distance, manually and slowly throwing the material by using a sample shovel, stopping throwing when the material exists in the crusher, and throwing after the material is crushed, so that the material is fully crushed.
S5, adjusting the crusher to a fourth grade corresponding scale, adjusting the gap between the jaw plates to a fourth grade corresponding distance, manually and slowly throwing the material by using a sample shovel, stopping throwing when the material exists in the crusher, and throwing after the material is crushed, so that the material is fully crushed.
S6, screening the crushed material obtained in the step S5 by using a 20-mesh (0.850mm) sample sieve, discarding oversize materials, and taking 70g of undersize material samples.
S7, magnetic separation
And (4) carrying out magnetic separation on the sample obtained by screening in the step (S6) by using a magnet, discarding the foreign impurities which cannot be adsorbed, selecting the sample subjected to magnetic separation on the screen, and finishing the sample preparation process when the sample subjected to magnetic separation is not less than 50 g.
Specific crushing particle diameters in the stepwise crushing according to the first fraction, the second fraction, the third fraction and the fourth fraction in examples 1 to 8 are shown in table 1. The results of counting the four-stage crushing time of examples 1 to 8 are shown in Table 1.
Table 1 examples to example 8 data
As can be seen from the table, the sample preparation method for the sample for the chemical analysis of the low-carbon ferrochrome provided by the embodiment of the application can compress the sample preparation time within 10 minutes. And when the first size fraction is 15 mm; the second size fraction is 8 mm; the third size fraction is 3 mm; the fourth size fraction is 0.5mm, the total crushing time can be controlled within 5.5 minutes, and the time is shortest. And example 3 and example 4 both used a first size fraction of 15 mm; the second size fraction is 8 mm; the third size fraction is 3 mm; the fourth fraction was 0.5mm, the total crushing time in example 3 was 5 minutes, and the total crushing time in example 4 was 5.5 minutes, with a deviation of 0.5 minutes or less, which indicates that the sample preparation method for the low-carbon ferrochrome chemical analysis sample according to the embodiment of the present application has excellent repeatability and can be applied to industrial applications.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A sample preparation method for a sample for chemical analysis of low-carbon ferrochrome is characterized by comprising the following steps:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction so as to gradually reduce the particle size of the low-carbon ferrochrome samples;
then screening the low-carbon ferrochrome sample after the fourth size fraction crushing, and taking a test sample with the particle size of less than or equal to 1.6 mm;
the first size fraction is within the range of 13 mm-17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
2. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 1,
the first size fraction is within the range of 15 mm-17 mm;
the second size fraction is within the range of 7 mm-8 mm;
the third size fraction is within the range of 2 mm-4 mm;
the fourth fraction is in the range of 0.5mm to 0.9 mm.
3. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 1 or 2,
the step of crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction comprises the following steps:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction by adopting a crusher;
the jaw plate material of the crusher comprises tungsten carbide.
4. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 1,
the step of screening the low-carbon ferrochrome sample after the fourth size fraction crushing comprises the following steps:
screening the crushed low-carbon ferrochrome sample by using a sample screen, and taking undersize; the particle size of the undersize is less than or equal to 1.6 mm;
optionally, the undersize is further subjected to magnetic separation to remove impurities.
5. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 4,
taking the weight of the undersize product to be not less than 70 g.
6. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 4,
the step of screening the crushed low-carbon ferrochrome sample by using the sample screen comprises the following steps:
and screening the crushed low-carbon ferrochrome sample by using a 20-mesh sample screen, and taking undersize products.
7. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 1 or 4,
the weight of the sample with the grain size less than or equal to 1.6mm is not less than 50 g.
8. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 1,
the step of crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction, a second size fraction, a third size fraction and a fourth size fraction comprises the following steps:
crushing a batch of low-carbon ferrochrome samples step by step according to a first size fraction and a second size fraction, uniformly mixing and dividing the crushed materials, and then taking part of the materials to be crushed in a third size fraction and a fourth size fraction in sequence.
9. The method for preparing a sample for chemical analysis of low carbon ferrochrome according to claim 8,
the mixing and splitting comprises the following steps:
uniformly mixing and dividing the crushed materials, and taking at least two parts of materials to respectively carry out crushing of a third size fraction and a fourth size fraction in sequence;
or, the mixing and dividing comprises:
uniformly mixing and dividing the crushed materials, and taking two parts of materials to respectively carry out crushing of a third size fraction and a fourth size fraction in sequence; wherein the first material sample is not less than 2kg and the second material sample is not less than 7 kg.
10. A sample for chemical analysis of low-carbon ferrochrome, which is prepared by the method of any one of claims 1 to 9.
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