Scrap steel inspection method

Abstract

The invention discloses a waste steel inspection method, which comprises the following steps that: step 1, an inspector performs visual inspection on surface abnormity of a to-be-inspected wood shaving pressed cake in an unloading process to form a primary judgment result, and the result is input into a system; 2, taking an unloading inspection batch of the same supplier every day as one batch, and in the unloading process, randomly grabbing one wood shaving pressed cake by each vehicle according to a plum blossom five-point sampling method to serve as a sample; step 3, separately crushing each sample into blocks by using a hammer or a steel grabbing machine on site, and shoveling about 2kg of samples from the crushed material of each sample by using a sampling shovel according to a plum blossom five-point sampling method; and step 4, fully hammering the shoveled fragments again into samples with relatively small particle sizes, dividing the crushed samples into about 4kg by using a large-caliber riffle, dividing the samples into two parts again, retaining one part, and detecting the other part. The invention relates to the field of scrap steel detection, in particular to a scrap steel detection method.

Description

Technical Field

[0001] The invention relates to the field of scrap steel detection, and in particular to a method for detecting scrap steel. Background Art

[0002] There are currently two methods for testing unconventional scrap steel containing impurities and slag. One is the physical method: grab a small amount of sample, crush and screen it, weigh the impurities, and calculate the iron content based on the proportion; the other is the melting and casting method: grab some samples, add them to a small electric furnace for melting and casting, and test the Fe yield.

[0003] The physical method checks the quality by grabbing a small amount of samples and physically crushing and screening them. This method selects a small amount of samples, which is not representative, and the material composition is complex. It only uses physical testing, which has the problem of insufficient inspection accuracy. The melting and casting method involves grabbing some samples, adding them to a small electric furnace for melting and casting, and testing the Fe yield. This method requires a large number of samples, consumes a lot of manpower and material resources, and takes up to 8 hours to test. In addition, it only tests the Fe yield, and has problems such as low testing frequency, long testing time, and incomplete testing results. Summary of the invention

[0004] The present invention reduces resource consumption, improves sample representativeness, inspection timeliness, and comprehensive inspection accuracy through technical improvements. The operation steps of the present invention are illustrated by one type of unconventional scrap steel containing impurities and slag (wood shavings cake). Other unconventional scrap steel containing impurities and slag can also be inspected by referring to this method. Please explain, and avoid inconsistency. If modified, all the contents involved must be modified together.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is a method for inspecting scrap steel, comprising the following steps: Step 1: During the unloading process, the inspector visually inspects the surface abnormalities of the wood shavings cakes to be inspected and forms a preliminary judgment result, which is then entered into the system; Step 2: Take the unloading inspection batch of the same supplier every day as one batch. During the unloading process, randomly grab one shavings cake as a sample from each vehicle using the five-point sampling method; Step 3: Use a hammer or steel grabber to break each sample into pieces on site, and use a sampling shovel to take a sample of about 2 kg from the crushed material of each sample according to the five-point sampling method; Step 4: The scooped pieces are hammered again into samples with smaller particle sizes, and the crushed samples are reduced to about 4 kg using a large-caliber divider, and then divided into two parts again, one for retention and the other for testing; Step 5: Weigh the test sample to obtain the total weight of the sample, then put it into a drying oven and dry it at 105°C for 4 hours. Weigh the sample after drying, test the moisture content, and enter the result into the system. Step 6: Put the dried sample into a 50KW small melting furnace to melt it completely. The melting temperature is controlled at 1620°C with reference to the converter to control the total melting time. Step 7: When the molten iron in the furnace turns white and the liquid surface continues to boil, pour the molten iron in the crucible into a specified refractory container for casting. The molten slag in the molten iron has a lower specific gravity and will float on the surface of the molten iron; Step 8, placing the ingot aside and cooling it with air to solidify it; Step nine, using a hammer to hit the ingot to remove the surface slag and collect the slag; Step 10, weigh the ingot weight, Fe yield = ingot weight / sample weight after drying*100%, enter the ingot weight and sample weight after drying into the system, and the system automatically calculates the Fe yield; Step 11, weigh the slag, crush it and prepare samples for TFe testing, enter the slag weight and slag TFe results into the system, and the system automatically calculates the TFe yield; Step 12: Cut the ingot into two sections from the middle, smooth the sections, use a spectrometer to detect the element content of the sections, and enter the results into the system; Step 13: The final settlement system automatically calculates the weights of the above input results to form the final settlement results.

[0006] Furthermore, the surface abnormalities in step one mainly refer to ash, dripping water, debris and foreign matter.

[0007] Furthermore, the preliminary judgment result in step one mainly refers to the material grade and the apparent weight after deducting slag and weight.

[0008] Furthermore, the total melting time in step six is ​​controlled within 20-22 minutes.

[0009] Furthermore, in step seven, the liquid surface continues to boil for 1 min.

[0010] The beneficial effects achieved by the present invention using the above structure are as follows: 1. Compared with the physical method, the present invention has a larger sampling volume, is more representative, and has more comprehensive inspection items; compared with the melting and casting method, the present invention has a higher inspection frequency, the sampling volume accounts for the unloading volume unchanged, the number of inspectors is small, and the inspection items are more comprehensive.

[0011] 2. The present invention detects the moisture content of the sample and the iron content of the slag, and the test results are more scientific and accurate than those of the physical method and the melting and casting method. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A flowchart of a method for inspecting scrap steel proposed by the present invention; DETAILED DESCRIPTION

[0013] As the instruction manual Figure 1 As shown, the present invention is a method for inspecting scrap steel. Example 1

[0014] A method for inspecting scrap steel comprises the following steps: Step 1: During the unloading process, the inspector visually inspects the surface abnormalities of the wood shavings cakes to be inspected, mainly ash, dripping water, debris and foreign matter, and forms a preliminary judgment result, mainly referring to the material grade and apparent weight after deducting ash and slag, and enters the result into the system; Step 2: Take the unloading inspection batch of the same supplier every day as one batch. During the unloading process, randomly grab one shavings cake as a sample from each vehicle using the five-point sampling method; Step 3: Use a hammer or steel grabber to break each sample into pieces on site, and use a sampling shovel to take a sample of about 2 kg from the crushed material of each sample according to the five-point sampling method; Step 4: The scooped pieces are hammered again into samples with smaller particle sizes, and the crushed samples are reduced to about 4 kg using a large-caliber divider, and then divided into two parts again, one for retention and the other for testing; Step 5: Weigh the test sample to obtain the total weight of the sample, then put it into a drying oven and dry it at 105°C for 4 hours. Weigh the sample after drying, test the moisture content, and enter the result into the system. Step 6: Put the dried sample into a small melting furnace with a power of 50KW to melt it completely. The melting temperature is controlled at 1620°C with reference to the converter, and the total melting time is controlled at 21 minutes. Step 7: Wait until the molten iron in the furnace turns white and the liquid surface continues to boil for 1 minute, then pour the molten iron in the crucible into a specified refractory container for casting. The molten slag in the molten iron has a lower specific gravity and will float on the surface of the molten iron; Step 8, placing the ingot aside and cooling it with air to solidify it; Step nine, using a hammer to hit the ingot to remove the surface slag and collect the slag; Step 10, weigh the ingot weight, Fe yield = ingot weight / sample weight after drying*100%, enter the ingot weight and sample weight after drying into the system, and the system automatically calculates the Fe yield; Step 11, weigh the slag, crush it and prepare samples for TFe testing, enter the slag weight and slag TFe results into the system, and the system automatically calculates the TFe yield; Step 12: Cut the ingot into two sections from the middle, smooth the sections, use a spectrometer to detect the element content of the sections, and enter the results into the system; Step 13: The final settlement system automatically calculates the weights of the above input results to form the final settlement results. Example 2

[0015] A method for inspecting scrap steel comprises the following steps: Step 1: During the unloading process, the inspector visually inspects the surface abnormalities of the wood shavings cakes to be inspected, mainly ash, dripping water, debris and foreign matter, and forms a preliminary judgment result, mainly referring to the material grade and apparent weight after deducting ash and slag, and enters the result into the system; Step 2: Take the unloading inspection batch of the same supplier every day as one batch. During the unloading process, randomly grab one shavings cake as a sample from each vehicle using the five-point sampling method; Step 3: Use a hammer or steel grabber to break each sample into pieces on site, and use a sampling shovel to take a sample of about 2 kg from the crushed material of each sample according to the five-point sampling method; Step 4: The scooped pieces are hammered again into samples with smaller particle sizes, and the crushed samples are reduced to about 4 kg using a large-caliber divider, and then divided into two parts again, one for retention and the other for testing; Step 5: Weigh the test sample to obtain the total weight of the sample, then put it into a drying oven and dry it at 105°C for 4 hours. Weigh the sample after drying, test the moisture content, and enter the result into the system. Step 6: Put the dried sample into a small melting furnace with a power of 50KW to melt it completely. The melting temperature is controlled at 1620°C with reference to the converter, and the total melting time is controlled at 20 minutes. Step 7: Wait until the molten iron in the furnace turns white and the liquid surface continues to boil for 1 minute, then pour the molten iron in the crucible into a specified refractory container for casting. The molten slag in the molten iron has a lower specific gravity and will float on the surface of the molten iron; Step 8, placing the ingot aside and cooling it with air to solidify it; Step nine, using a hammer to hit the ingot to remove the surface slag and collect the slag; Step 10, weigh the ingot weight, Fe yield = ingot weight / sample weight after drying*100%, enter the ingot weight and sample weight after drying into the system, and the system automatically calculates the Fe yield; Step 11, weigh the slag, crush it and prepare samples for TFe testing, enter the slag weight and slag TFe results into the system, and the system automatically calculates the TFe yield; Step 12: Cut the ingot into two sections from the middle, smooth the sections, use a spectrometer to detect the element content of the sections, and enter the results into the system; Step 13: The final settlement system automatically calculates the weights of the above input results to form the final settlement results. Example 3

[0016] A method for inspecting scrap steel comprises the following steps: Step 1: During the unloading process, the inspector visually inspects the surface abnormalities of the wood shavings cakes to be inspected, mainly ash, dripping water, debris and foreign matter, and forms a preliminary judgment result, mainly referring to the material grade and apparent weight after deducting ash and slag, and enters the result into the system; Step 2: Take the unloading inspection batch of the same supplier every day as one batch. During the unloading process, randomly grab one shavings cake as a sample from each vehicle using the five-point sampling method; Step 3: Use a hammer or steel grabber to break each sample into pieces on site, and use a sampling shovel to take a sample of about 2 kg from the crushed material of each sample according to the five-point sampling method; Step 4: The scooped pieces are hammered again into samples with smaller particle sizes, and the crushed samples are reduced to about 4 kg using a large-caliber divider, and then divided into two parts again, one for retention and the other for testing; Step 5: Weigh the test sample to obtain the total weight of the sample, then put it into a drying oven and dry it at 105°C for 4 hours. Weigh the sample after drying, test the moisture content, and enter the result into the system. Step 6: Put the dried sample into a small melting furnace with a power of 50KW to melt it completely. The melting temperature is controlled at 1620°C with reference to the converter, and the total melting time is controlled at 22 minutes. Step 7: Wait until the molten iron in the furnace turns white and the liquid surface continues to boil for 1 minute, then pour the molten iron in the crucible into a specified refractory container for casting. The molten slag in the molten iron has a lower specific gravity and will float on the surface of the molten iron; Step 8, placing the ingot aside and cooling it with air to solidify it; Step nine, using a hammer to hit the ingot to remove the surface slag and collect the slag; Step 10, weigh the ingot weight, Fe yield = ingot weight / sample weight after drying*100%, enter the ingot weight and sample weight after drying into the system, and the system automatically calculates the Fe yield; Step 11, weigh the slag, crush it and prepare samples for TFe testing, enter the slag weight and slag TFe results into the system, and the system automatically calculates the TFe yield; Step 12: Cut the ingot into two sections from the middle, smooth the sections, use a spectrometer to detect the element content of the sections, and enter the results into the system; Step 13: The final settlement system automatically calculates the weights of the above input results to form the final settlement results.

[0017] The comparison data is as follows: The test results of the present invention are compared with those of the physical method and the melting and casting method, and the data are shown in Table 1:

[0018] It can be concluded from Table 1 that compared with the physical method, the present invention has a larger sampling volume, is more representative, and has more comprehensive inspection items; compared with the melting and casting method, the present invention has a higher inspection frequency, the sampling volume accounts for the same proportion of the unloading volume, the number of inspectors is small, and the inspection items are more comprehensive.

[0019] Three batches of materials were randomly tested, and the present invention was compared with the physical method and the melting and casting method. The data are shown in Table 2:

[0020] It can be concluded from Table 2 that the present invention detects the moisture content of the sample and the iron content of the slag, and the detection results are more scientific and accurate than those of the physical method and the melting and casting method.

[0021] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for inspecting scrap steel, characterized in that: The steps include: Step 1: During the unloading process, the inspector visually inspects the surface abnormalities of the wood shavings cakes to be inspected and forms a preliminary judgment result, which is then entered into the system; Step 2: Take the unloading inspection batch of the same supplier every day as one batch. During the unloading process, randomly grab one shavings cake as a sample from each vehicle using the five-point sampling method; Step 3: Use a hammer or steel grabber to break each sample into pieces on site, and use a sampling shovel to take a sample of about 2 kg from the crushed material of each sample according to the five-point sampling method; Step 4: The scooped pieces are hammered again into samples with smaller particle sizes, and the crushed samples are reduced to about 4 kg using a large-caliber divider, and then divided into two parts again, one for retention and the other for testing; Step 5: Weigh the test sample to obtain the total weight of the sample, then put it into a drying oven and dry it at 105°C for 4 hours. Weigh the sample after drying, test the moisture content, and enter the result into the system. Step 6: Put the dried sample into a small melting furnace with a power of 50KW to melt it completely. The melting temperature is controlled at 1620°C with reference to the converter to control the total melting time; Step 7: When the molten iron in the furnace turns white and the liquid surface continues to boil, pour the molten iron in the crucible into a specified refractory container for casting. The molten slag in the molten iron has a lower specific gravity and will float on the surface of the molten iron. Step 8, placing the ingot aside and cooling it with air to solidify it; Step nine, using a hammer to hit the ingot to remove the surface slag and collect the slag; Step 10, weigh the ingot weight, Fe yield = ingot weight / sample weight after drying*100%, enter the ingot weight and sample weight after drying into the system, and the system automatically calculates the Fe yield; Step 11, weigh the slag, crush it and prepare samples for TFe testing, enter the slag weight and slag TFe results into the system, and the system automatically calculates the TFe yield; Step 12: Cut the ingot into two sections from the middle, smooth the sections, use a spectrometer to detect the element content of the sections, and enter the results into the system; Step 13: The final settlement system automatically calculates the weights of the above input results to form the final settlement results.

2. The method for inspecting scrap steel according to claim 1, characterized in that: The surface abnormalities in step 1 mainly refer to ash, dripping water, debris and foreign matter.

3. The method for inspecting scrap steel according to claim 2, characterized in that: The preliminary judgment result in the step 1 mainly refers to the material grade and the apparent weight after deducting slag and weight.

4. The method for inspecting scrap steel according to claim 1, characterized in that: The total melting time in step six is ​​controlled within 20-22 minutes.

5. The method for inspecting scrap steel according to claim 1, characterized in that: In step 7, the liquid surface continues to boil for 1 min.

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