Accurate sample preparation method for ferrochrome analysis sample

Abstract

The invention belongs to the technical field of metallurgical detection, relates to an accurate sample preparation method of a ferrochrome analysis sample, and aims to solve the problems of low standardized operation degree, poor sample representativeness, large analysis error and the like in the conventional ferrochrome sample preparation method and influence on the accuracy of an analysis result. In order to solve the problems, the invention provides an accurate sample preparation method for improving the representativeness and accuracy of the sample by strictly controlling the processes of sample division, screening, grinding and the like. The method comprises the following specific steps: performing multiple times of division through a riffle to ensure that a sample is uniform; performing 6mm screening on the sample, and crushing the screened sample by using a press machine; and finally, about 200g of analysis samples are extracted from the uniformly mixed samples, and are dried, ground and the like, so that the consistency of the samples is ensured. According to the method, the representativeness of the sample is improved, errors in the analysis process are reduced, and the accuracy and the stability of an analysis result are ensured. The method can obviously improve the accuracy of ferrochrome analysis, and has high practical value and popularization prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical detection and relates to a method for accurately preparing ferrochrome analysis samples. Background Art

[0002] Ferrochrome is an alloy material widely used in the metallurgical industry, mainly for the production of stainless steel. In order to ensure that the quality of ferrochrome meets the standards, accurate preparation of analytical samples is essential. Usually, the preparation method of ferrochrome analytical samples involves randomly selecting a certain number of sample blocks from the ferrochrome block, and obtaining the sample to be analyzed through mechanical crushing and grinding. However, there are a series of problems in the existing ferrochrome sample preparation method, which affects the accuracy of the final analysis results.

[0003] At present, the common sample preparation method usually adopts the following steps: first, randomly select several sample blocks from the incoming ferrochrome alloy raw materials and crush them into smaller particles; then, use a grinder to further grind the particles to obtain the samples required for analysis. However, these existing methods have the following disadvantages:

[0004] 1. Low degree of standardized operations

[0005] Each step in the existing sample preparation method is relatively simple to operate, but lacks a unified standardized process. Especially in the sample reduction process, there are often problems such as non-standard human operation and uneven reduction. Due to the differences in the sample source blocks, some materials may not effectively represent the quality of the entire batch, thereby affecting the accuracy of the final analysis.

[0006] 2. Poor sample representativeness

[0007] Since the existing methods rely on manual random sampling and rough crushing, the specific components in some sample blocks are not effectively transferred to the final analysis sample, resulting in poor sample representativeness. This situation is particularly prominent when the ferrochrome composition is uneven, which can easily lead to large deviations in the analysis results and fail to accurately reflect the overall quality of the ferrochrome.

[0008] 3. Sample inhomogeneity leads to large errors

[0009] Due to the large and uneven particle size of ferrochrome raw materials, the traditional coarse crushing and fine grinding methods cannot ensure that the components of each sample particle are evenly distributed in the final analysis sample. In particular, the unevenness during screening and crushing may lead to deviations in the component ratio of the analysis sample, thereby increasing the error of the analysis result.

[0010] Therefore, the ferrochromium sample preparation method in the prior art has obvious deficiencies in improving sample representativeness, reducing analytical errors, and standardizing operations. There is an urgent need for a sample preparation method that can improve sample uniformity, accuracy, and repeatability to ensure the reliability and accuracy of the analysis results. Summary of the invention

[0011] In view of this, the purpose of the present invention is to solve the problems of low degree of standardization of sample preparation, low sample representativeness, large result errors, etc., and to provide a method for accurately preparing ferrochrome analysis samples.

[0012] In order to achieve the above object, the present invention provides the following technical solutions:

[0013] A method for accurately preparing ferrochrome analysis samples comprises the following steps:

[0014] 1) All samples are divided once through the divider. Those that cannot pass through the divider are crushed by a press and then divided again;

[0015] 2) All samples that pass through the splitter are mixed by repeating the splitter reduction process three times;

[0016] 3) The mixed sample is divided several times by a divider to obtain a sample of about 2 kg;

[0017] 4) Samples weighing about 2 kg are passed through a 6 mm sieve, and the material on the sieve is crushed by a press and then passed through a 6 mm sieve;

[0018] 5) 2 kg of sample that passes through a 6 mm sieve is divided into an analytical sample of about 200 g by a bin splitter several times, and the remaining sample is placed in a sample barrel as a retained sample;

[0019] 6) Place the analysis sample in an oven at 95±5°C and dry it, then cool it to room temperature;

[0020] 7) Pour about 50g into the sample bowl, turn on the grinder and grind for 15s, clean the sample bowl, and pour out the cleaned sample;

[0021] 8) Pour the remaining 150g sample into a clean sample bowl, turn on the grinder, and grind it twice. After the first grinding, pass it through a 1.5mm sample sieve for 50s. Grind the sieved material again for 10-30s according to its weight until it passes through the 1.5mm sample sieve.

[0022] 9) All samples with a diameter of more than 1.5 mm are mixed evenly and bagged and sealed. Two copies are made, one for inspection and analysis and one for retention. The weight of each sample should not be less than 50 grams.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a method for accurately preparing ferrochrome analysis samples. By adopting the method, all blocks of the sample and all components of each block have the same probability of entering the final analysis sample, the analysis sample is highly representative, the analysis result has a small error and high accuracy. Not only the standardized operation rate is improved, but also the representativeness of the sample and the accuracy and stability of the analysis result are guaranteed.

[0025] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 The results are compared between the ferrochrome sample preparation method of the present invention and the traditional method.

[0028] Figure 2 The results are a comparison of the Cr (%) analysis accuracy between the ferrochrome sample preparation method of the present invention and the traditional method.

[0029] Figure 3 The results are a comparison of the C (%) analysis accuracy between the ferrochrome sample preparation method of the present invention and the traditional method. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] See also Figures 1 to 3 A method for accurately preparing ferrochrome analysis samples comprises the following steps:

[0034] 1) All samples are divided once through the divider. Those that cannot pass through the divider are crushed by a press and then divided again;

[0035] 2) All samples that pass through the splitter are mixed by repeating the splitter reduction process three times;

[0036] 3) The mixed sample is divided several times by a divider to obtain a sample of about 2 kg;

[0037] 4) Samples weighing about 2 kg are passed through a 6 mm sieve, and the material on the sieve is crushed by a press and then passed through a 6 mm sieve;

[0038] 5) 2 kg of sample that passes through a 6 mm sieve is divided into an analytical sample of about 200 g by a bin splitter several times, and the remaining sample is placed in a sample barrel as a retained sample;

[0039] 6) Place the analysis sample in an oven at 95±5°C and dry it, then cool it to room temperature;

[0040] 7) Pour about 50g into the sample bowl, turn on the grinder and grind for 15s, clean the sample bowl, and pour out the cleaned sample;

[0041] 8) Pour the remaining 150g sample into a clean sample bowl, turn on the grinder, and grind it twice. After the first grinding, pass it through a 1.5mm sample sieve for 50s. Grind the sieved material again for 10-30s according to its weight until it passes through the 1.5mm sample sieve.

[0042] 9) All samples with a diameter of more than 1.5 mm are mixed evenly and bagged and sealed. Two copies are made, one for inspection and analysis and one for retention. The weight of each sample should not be less than 50 grams.

[0043] Sample preparation accuracy verification results, see Figures 1 to 3The same batch of micro-carbon ferrochrome was sampled using the original method and the new method, and three groups of parallel samples were compared and verified. The results show that by using the ferrochrome sample preparation method of the present invention, all the blocks of the sample and all the components of each block have the same probability of entering the final analysis sample, the analysis sample is highly representative, the analysis result has a small error and high accuracy.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for accurately preparing ferrochrome analysis samples, characterized in that: The steps include: 1) All samples are divided once through the divider. Those that cannot pass through the divider are crushed by a press and then divided again; 2) All samples that pass through the splitter are mixed by repeating the splitter reduction process three times; 3) The mixed sample is divided several times by a divider to obtain a sample of about 2 kg; 4) Samples weighing about 2 kg are passed through a 6 mm sieve, and the material on the sieve is crushed by a press and then passed through a 6 mm sieve; 5) 2 kg of sample that passes through a 6 mm sieve is divided into an analytical sample of about 200 g by a bin splitter several times, and the remaining sample is placed in a sample barrel as a retained sample; 6) Place the analysis sample in an oven at 95±5°C and dry it, then cool it to room temperature; 7) Pour about 50g into the sample bowl, turn on the grinder and grind for 15s, clean the sample bowl, and pour out the cleaned sample; 8) Pour the remaining 150g sample into a clean sample bowl, turn on the grinder, and grind it twice. After the first grinding, pass it through a 1.5mm sample sieve for 50s. Grind the sieved material again for 10-30s according to its weight until it passes through the 1.5mm sample sieve. 9) All samples with a diameter of more than 1.5 mm are mixed evenly and bagged and sealed. Two copies are made, one for inspection and analysis and one for retention. The weight of each sample should not be less than 50 grams.

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