Method for detecting proportion of impurities in shavings iron briquettes

Abstract

This invention discloses a method for detecting the proportion of impurities in shavings pressed into blocks, comprising the following steps: S1, selecting shavings pressed into blocks to obtain sample blocks; S2, disassembling the sample blocks and taking samples to obtain shavings samples; S3, reducing the shavings samples to obtain a first sample; S4, placing the first sample in an oven for baking, and obtaining a second sample after baking; S5, calculating the weight loss percentage; S6, sieving all the dried second samples through a first sieve with a 1 mm aperture, weighing the material passing through the first sieve, and obtaining the weight C of the material passing through the 1 mm sieve; S7, reducing the first material passing through the first sieve to obtain a third sample, sieving the third sample through a second sieve, and obtaining a second material passing through the second sieve; S8, weighing a certain weight of the second material passing through the second sieve and detecting the TFe content of the second material passing through the second sieve; S9, calculating the proportion of impurities in the shavings pressed into blocks. This method for detecting the proportion of impurities in shavings pressed into blocks can improve the accuracy of the detection results.

Description

Technical Field

[0001] This invention belongs to the field of scrap steel technology, specifically relating to a method for detecting the proportion of impurities in shavings iron briquettes. Background Technology

[0002] Shavings briquettes are a type of scrap steel, made from shavings produced by various machine tools through cutting, shaving, planing, and drilling. These shavings are then briquetted into approximately 1500mm x 70mm x 70mm blocks using balers with a capacity of 800-1500 tons. During processing, shavings may become contaminated with moisture, lubricant, and oil. Additionally, impurities may be introduced during collection, transportation, or processing, and there are instances where low-iron-content impurities are intentionally added.

[0003] When visually inspecting and deducting impurities from shavings, the method generally relies on visually identifying iron-containing impurities or powder as the basis for deduction. However, visual inspection is subject to many subjective factors, resulting in poor accuracy and causing considerable controversy.

[0004] Tests revealed that some batches of shaving iron blocks contained an unidentified liquid, which analysis suggested was a mixture of moisture, lubricant, and oil, making it difficult to detect visually.

[0005] In existing technologies, the yield of shavings briquettes is tested using a small furnace. However, the molten material is at a temperature of 1300-1400 degrees Celsius during the testing process and must be poured out, which poses a safety risk. Furthermore, the crucibles used in the small furnace are prone to cracking if reused after each test, requiring a new crucible for each test, resulting in high costs. Additionally, the melting process produces a lot of smoke, which is environmentally unfriendly. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a method for detecting the proportion of impurities in shavings iron briquettes, with the purpose of improving the accuracy of the detection results.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a method for detecting the proportion of impurities in shaving iron blocks, comprising the following steps:

[0008] S1. Selection of shaving iron pressing blocks to obtain sample blocks;

[0009] S2. Disassemble the sample block, take samples, and obtain shaving iron samples;

[0010] S3. Reduce the size of the shaving iron sample to obtain the first sample;

[0011] S4. Place the first sample in an oven for baking. After baking, obtain the second sample.

[0012] S5. Calculate the weight reduction percentage. Weight reduction percentage = (AB) / A × 100%, where A is the weight of the first sample and B is the weight of the second sample.

[0013] S6. Use a first sieve with a 1 mm aperture to sieve all the dried second samples, weigh the material passing through the first sieve, and obtain the weight C of the material passing through the 1 mm sieve.

[0014] S7. Reduce the first sieve undersize to obtain the third sample, and use the second sieve to sieve the third sample to obtain the second sieve undersize;

[0015] S8. Weigh a certain weight of the second sieve material and test the TFe content of the second sieve material.

[0016] S9. Calculate the proportion of impurities in the planed iron briquettes.

[0017] In step S2, the weight of the shavings taken from each sample block is ≥3 kg.

[0018] In step S3, the weight of the first sample is ≥2 kg.

[0019] In step S3, a divider is used to reduce the size of the shaving iron sample.

[0020] In step S4, when baking the first sample, the temperature inside the oven is gradually increased from a first temperature to a second temperature, and the baking time is ≥1 hour.

[0021] In step S4, the first temperature is 160℃ and the second temperature is 200℃±5℃.

[0022] In step S7, the second screen is a 140-mesh screen.

[0023] In step S7, the first sieve material is mixed and reduced to obtain a third sample by using the conical quartering method. The weight of the third sample is 100 grams.

[0024] In step S8, the weight of the second sieve undersize material is 50 grams.

[0025] The method for detecting the proportion of impurities in shaving iron blocks of the present invention can improve the accuracy of the detection results. Detailed Implementation

[0026] The following description of the embodiments further illustrates the specific implementation of the present invention in detail, with the aim of helping those skilled in the art to have a more complete, accurate, and in-depth understanding of the concept and technical solution of the present invention, and facilitating its implementation.

[0027] This invention provides a method for detecting the proportion of impurities in shaving iron briquettes, comprising the following steps:

[0028] S1. Selection of shaving iron pressing blocks to obtain sample blocks;

[0029] S2. Disassemble the sample block, take samples, and obtain shaving iron samples;

[0030] S3. Reduce the size of the shaving iron sample to obtain the first sample;

[0031] S4. Place the first sample in an oven for baking. After baking, obtain the second sample.

[0032] S5. Calculate the weight reduction percentage. Weight reduction percentage = (AB) / A × 100%, where A is the weight of the first sample and B is the weight of the second sample.

[0033] S6. Use a first sieve with a 1 mm aperture to sieve all the dried second samples, weigh the material passing through the first sieve, and obtain the weight C of the material passing through the 1 mm sieve.

[0034] S7. Reduce the first sieve undersize to obtain the third sample, and use the second sieve to sieve the third sample to obtain the second sieve undersize;

[0035] S8. Weigh a certain weight of the second sieve material and test the TFe content of the second sieve material.

[0036] S9. Calculate the proportion of impurities in the planed iron briquettes.

[0037] Specifically, in step S1 above, the carriage of the vehicle carrying the shavings iron blocks is divided into 12 parts, and the selection of shavings iron blocks in the corresponding parts of the carriage is determined by rolling dice.

[0038] Table 1 Carriage Numbering Table

[0039] 12 10 8 6 4 2 cars 11 9 7 5 3 1 head

[0040] In step S1 above, a 12-sided die was used on-site to avoid the problem of not getting a 1 when using two 6-sided dice. When inspecting the shavings iron blocks, four sample blocks were randomly selected from each vehicle, and the random unpacking location was determined by rolling dice.

[0041] In step S1 above, when there are two layers of shaving iron blocks placed in the carriage, two dice need to be rolled. As shown in Table 1, each time the dice number corresponds to one piece from the upper and lower layers of the carriage and one piece is taken out of the package. A total of 4 pieces are taken out (if the same number is rolled, it is invalid until different numbers are rolled).

[0042] In step S1 above, when there are three layers of shaving iron blocks placed in the carriage, roll the dice twice. The first dice roll corresponds to the carriage part where two blocks from the upper and middle layers are grabbed and unpacked. The second dice roll corresponds to the carriage part where two blocks from the middle and lower layers are grabbed and unpacked. A total of 4 blocks are unpacked.

[0043] In step S2 above, the weight of the shavings used for sampling each sample block is ≥3 kg. The sample block to be sampled is unpacked two or three times using a pack unpacking machine until the sample block is completely broken apart, or the sampling requirements are met. ≥3 kg of shavings are taken from each block. ≥4 blocks are sampled, and the total sample weight is ≥12 kg.

[0044] In step S3 above, a divider is used to reduce the size of the shavings sample to obtain a first sample, the weight of which is ≥2 kg. Because loose shavings are prone to jamming, the slot width of the divider should be greater than 80 mm.

[0045] In step S4 above, when baking the first sample, the temperature inside the oven is gradually increased from the first temperature to the second temperature, and the baking time is ≥1 hour until no smoke is emitted from the oven.

[0046] In step S4 above, preferably, the first temperature is 160℃ and the second temperature is 200℃±5℃. The temperature rise requirement inside the oven is as follows: starting from the first temperature, the temperature inside the oven is increased by 10℃ every 5 minutes. During the temperature rise process, it is necessary to observe and ensure that no open flames appear inside the oven.

[0047] In step S5 above, after the second sample is dried, the weight reduction percentage needs to be calculated. The weight reduction percentage refers to the percentage reduction in weight of the shaving iron block sample after drying the moisture, lubricant and oil. Weight reduction percentage = (AB) / A × 100%, where B is less than A.

[0048] In step S6 above, all the dried second samples are sieved through a 1 mm sieve to obtain the first sieve undersize, and then the first sieve undersize is weighed to determine the weight C of the 1 mm sieve undersize.

[0049] In step S7 above, the second screen is a 140-mesh screen.

[0050] In step S7 above, the first sieve undersize is mixed and reduced by the conical quartering method to obtain the third sample, which weighs 100 grams. After being crushed in a mortar, it is passed through a 140-mesh sieve to obtain the second sieve undersize.

[0051] In step S8 above, the weight of the second sieve residue is 50 grams. The second sieve residue is sent to the laboratory for testing to detect the TFe content of the second sieve residue.

[0052] In step S9 above, the proportion of impurities in the planed iron briquettes is calculated as follows: Proportion of impurities in planed iron briquettes = (90% - TFe) × C / B + weight reduction.

[0053] The method for detecting the proportion of impurities in shaving iron blocks of the present invention has the following advantages:

[0054] 1. This quantitative inspection method effectively solves the problem that visual inspection of impurities in shaving iron blocks is difficult and inaccurate.

[0055] 2. This quantitative testing method effectively solves the problem of quantitative detection of moisture, lubricant, and oil contaminants mixed in with shaving iron blocks;

[0056] 3. A practical method of randomly selecting samples was adopted, which also allows for review and re-inspection, effectively reducing disputes;

[0057] 4. This method has a maximum temperature of 200℃±5℃, which is relatively safe and avoids the high temperature danger of molten materials at 1300-1400℃ in small furnaces.

[0058] 5. The equipment used in this quantitative testing method can be reused, which avoids the excessive loss of crucibles in small furnaces;

[0059] 6. This quantitative detection method is highly practical and easy for on-site testing personnel to operate;

[0060] 7. Percentage of impurities in shaving iron briquettes = (90% - TFe% of material passing through a 1 mm sieve) × Weight of material passing through a 1 mm sieve C / Weight of dried shavings B + Weight reduction %. This formula can scientifically and comprehensively test for various impurities in shaving iron briquettes.

[0061] 8. Using this quantitative detection method for the proportion of impurities in shavings blocks, over 600 batches were tested, scientifically and effectively reflecting the presence of impurities in the shavings blocks. This provided a clear basis for assessment.

[0062] The present invention has been described above by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for detecting the proportion of impurities in shaving iron briquettes, characterized in that, Including the following steps: S1. Selection of shaving iron pressing blocks to obtain sample blocks; S2. Disassemble the sample block, take samples, and obtain shaving iron samples; S3. Reduce the size of the shaving iron sample to obtain the first sample; S4. Place the first sample in an oven for baking. After baking, obtain the second sample. S5. Calculate the weight reduction percentage. Weight reduction percentage = (AB) / A × 100%, where A is the weight of the first sample and B is the weight of the second sample. S6. Use a first sieve with a 1 mm aperture to sieve all the dried second samples, weigh the material passing through the first sieve, and obtain the weight C of the material passing through the 1 mm sieve. S7. Reduce the first sieve undersize to obtain the third sample, and use the second sieve to sieve the third sample to obtain the second sieve undersize; S8. Weigh a certain weight of the second sieve material and test the TFe content of the second sieve material. S9. Calculate the proportion of impurities in the planed iron briquettes; In step S4, when baking the first sample, the temperature inside the oven is gradually increased from the first temperature to the second temperature, and the baking time is ≥1 hour. The first temperature is 160℃, and the second temperature is 200℃±5℃; The temperature requirement inside the oven is as follows: starting from the initial temperature, the temperature inside the oven should be increased by 10°C every 5 minutes. In step S9, the proportion of impurities in the planed iron briquettes is calculated as follows: Proportion of impurities in planed iron briquettes = (90% - TFe) × C / B + weight reduction.

2. The method for detecting the proportion of impurities in shaving iron blocks according to claim 1, characterized in that, In step S2, the weight of the shavings taken from each sample block is ≥3 kg.

3. The method for detecting the proportion of impurities in shaving iron blocks according to claim 1, characterized in that, In step S3, the weight of the first sample is ≥2 kg.

4. The method for detecting the proportion of impurities in shaving iron blocks according to claim 1, characterized in that, In step S3, a divider is used to reduce the size of the shaving iron sample.

5. The method for detecting the proportion of impurities in shaving iron blocks according to any one of claims 1 to 4, characterized in that, In step S4, when baking the first sample, the temperature inside the oven is gradually increased from a first temperature to a second temperature, and the baking time is ≥1 hour.

6. The method for detecting the proportion of impurities in shaving iron blocks according to claim 5, characterized in that, In step S4, the first temperature is 160℃ and the second temperature is 200℃±5℃.

7. The method for detecting the proportion of impurities in shaving iron blocks according to any one of claims 1 to 6, characterized in that, In step S7, the second screen is a 140-mesh screen.

8. The method for detecting the proportion of impurities in shaving iron blocks according to any one of claims 1 to 6, characterized in that, In step S7, the first sieve material is mixed and reduced to obtain a third sample by using the conical quartering method. The weight of the third sample is 100 grams.

9. The method for detecting the proportion of impurities in shaving iron blocks according to any one of claims 1 to 6, characterized in that, In step S8, the weight of the second sieve undersize material is 50 grams.