Scrap steel value accounting method based on multi-dimensional characteristics

Abstract

The invention relates to a scrap steel value accounting method based on multi-dimensional characteristics, and belongs to the technical field of waste and old material recycling methods. According to the technical scheme, the method comprises the steps that the content of valuable elements and the content of residual elements in waste steel are obtained, and the type of waste steel is classified; and calculating the value coefficient of each type of waste steel based on a preset constraint function, and calculating the price of the type of waste steel according to the reference price of the waste steel. The method has the beneficial effects that comprehensive and accurate information is provided for comprehensive evaluation of the value of the scrap steel by integrating data of multiple dimensions such as the material, the material type, the smelting process and the adding mode of the scrap steel, and meanwhile, a scientific and reasonable pricing basis is provided for recycling of scrap steel resources in the iron and steel industry.

Description

TECHNICAL FIELD

[0001] The application relates to a scrap steel value accounting method based on multi-dimensional characteristics and belongs to the technical field of scrap recycling. BACKGROUND

[0002] With the improvement of global environmental awareness and the increasing importance of resource recycling, scrap steel as an important renewable resource, its effective utilization is of great significance to reduce resource consumption and environmental pollution, and its recycling value is increasingly concerned.

[0003] However, the current scrap steel procurement business generally faces problems such as insufficient evaluation basis and unreasonable pricing mechanism, especially for the procurement of pure scrap steel, which often leads to a mismatch between procurement cost and benefit due to the lack of scientific performance-price evaluation. Traditionally, the value of scrap steel is evaluated based on a single physical property (such as thickness), ignoring the differences in material, type, smelting process, and adding method, resulting in inaccurate and comprehensive evaluation results. In addition, scrap steel pricing often lacks effective linkage with iron ore market prices, making it difficult to reflect the real market supply and demand relationship and cost-effectiveness. In contrast, foreign countries have more mature research in this field, such as developed countries like the United States and Japan, which have introduced advanced technology and management models to achieve efficient scrap steel recycling, and have combined international trade environment, environmental protection policies and other factors to comprehensively evaluate the value of scrap steel. Therefore, it is urgent to develop a more scientific and comprehensive scrap steel evaluation system. SUMMARY

[0004] The application aims to provide a scrap steel value accounting method based on multi-dimensional characteristics, which integrates data from multiple dimensions such as material, type, smelting process, and adding method to provide comprehensive and accurate information for the comprehensive evaluation of scrap steel value, changing the previous situation of single data source and insufficient evaluation dimensions. Based on the results of multi-dimensional data analysis, not only does it solve the problem of unreasonable performance-price evaluation in scrap steel procurement, but also provides a scientific and reasonable pricing basis for scrap steel resource recycling in the steel industry. Scrap steel value accounting helps enterprises better manage the scrap steel supply chain, reasonably arrange procurement, inventory and production plans, and improve the efficiency and flexibility of the supply chain. By accurately accounting for the value of scrap steel, enterprises can better evaluate its recycling potential, optimize resource allocation, reduce waste, and improve resource utilization efficiency. A scientific accounting method can provide transparent and fair pricing for the scrap steel recycling industry, promote the standardization of the recycling market, encourage more enterprises to participate in scrap steel recycling, and effectively solve the problems in the background technology.

[0005] The technical solution of the application is a scrap steel value accounting method based on multi-dimensional characteristics, comprising the following steps:

[0006] (1) obtaining the content of valuable elements and residual elements in the scrap steel and classifying the scrap steel;

[0007] (2) calculating the value coefficient of each type of scrap steel based on a preset constraint function;

[0008] (3) calculating the price of the scrap steel based on the benchmark price of the scrap steel.

[0009] In the step (1), the spark discharge direct-reading spectroscopy is used to detect the element content of the scrap steel raw material, the valuable elements are C, Nb, Cr, Ni and Mo, and the residual elements are Cu, Sn and As, and the scrap steel is divided into three categories of general scrap steel, pig iron and alloy scrap steel according to the detection results.

[0010] In the step (2), the constraint parameters of the preset constraint function include the content of valuable elements, the content of residual elements, the scrap steel yield, the surface quality of the scrap steel, the melting coefficient of the scrap steel and the scrap steel charging mode;

[0011] 1) the value of valuable elements: taking the average content of valuable elements in the scrap steel as the benchmark, the value of valuable elements $ = valuable element price * (content of the element in the scrap steel - average content of the element in the remaining scrap steel), wherein the content of C element is 2%, the content of Cr element is 1%, the content of Nb element is 0.01%, the content of Ni element is 0.5% and the content of Mo element is 0.2%;

[0012] 2) the value of residual elements: taking the average content of residual elements in the scrap steel as the benchmark, when the content of Cu element in the scrap steel increases by 20 ppm, the content of Sn element increases by 5 ppm and the content of As element increases by 5 ppm, the value of the scrap steel decreases by 10 yuan / ton, respectively, and the value of residual elements & = 10 * (ΔCu / 20 + ΔSn / 5 + ΔAs / 5);

[0013] 3) the quality coefficient α of the scrap steel: when the scrap steel impurity removal rate is ≤0.5, α = 1.08; 0.5 < scrap steel impurity removal rate ≤1, α = 1.04; 1 < scrap steel impurity removal rate ≤1.5, α = 1; 1.5 < scrap steel impurity removal rate ≤2, α = 0.98; 2 < scrap steel impurity removal rate ≤2.5, α = 0.96; and the scrap steel impurity removal rate > 2.5, α = 0.94;

[0014] 4) the consumption coefficient β: when the scrap steel yield is ≥0.98, β = 1.02; 0.96 ≤ scrap steel yield < 0.98, β = 1; 0.94 ≤ scrap steel yield < 0.96, β = 0.99; 0.92 ≤ scrap steel yield < 0.94, β = 0.98; 0.90 ≤ scrap steel yield < 0.92, β = 0.97; 0.88 ≤ scrap steel yield < 0.90, β = 0.96; and the scrap steel yield < 0.88, β = 0.95;

[0015] 5) Melting coefficient §: when the thickness of scrap steel <1mm, §=1.02; 1≤thickness of scrap steel <2, §=1.01; 2≤thickness of scrap steel <3, §=1; 3≤thickness of scrap steel <4, §=0.99; 4≤thickness of scrap steel <5, §=0.98; 5≤thickness of scrap steel <6, §=0.97; thickness of scrap steel ≥6, §=0.96;

[0016] 6) Scrap steel into the furnace is divided into converter scrap steel and electric furnace scrap steel;

[0017] 7) Scrap steel value coefficient Y=α*β*§.

[0018] The reference price of scrap steel in the step (3) is S, and the procurement guide price of scrap steel is: carbon-containing scrap steel for electric furnace: ￥=S*Y+$-&; carbon-containing scrap steel for converter: ￥=S*Y-$-&; and the rest of scrap steel: ￥=S*Y.

[0019] The beneficial effects of the present application are: by integrating the data of multiple dimensions such as material quality, material type, smelting process, and adding method of scrap steel, comprehensive and accurate information is provided for the comprehensive evaluation of the value of scrap steel, which changes the previous situation of single data source and insufficient evaluation dimensions, based on the analysis results of multi-dimensional data, not only solves the problem of unreasonable evaluation of cost performance in scrap steel procurement, but also provides a scientific and reasonable pricing basis for the recycling of scrap steel resources in the steel industry; scrap steel value accounting helps enterprises better manage the scrap steel supply chain, reasonably arrange procurement, inventory and production plan, and improve the efficiency and flexibility of the supply chain. By accurately accounting for the value of scrap steel, enterprises can better evaluate the recycling potential, thereby optimizing resource allocation, reducing waste, improving resource utilization efficiency, and a scientific accounting method can provide transparent and fair pricing basis for the scrap steel recycling industry, promote the standardized development of the recycling market, and encourage more enterprises to participate in scrap steel recycling. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiment of the application clearer, the technical scheme in the embodiment of the application will be clearly and completely described below. Obviously, the described embodiment is only a part of the embodiments of the application, and not all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0021] A scrap steel value accounting method based on multi-dimensional characteristics, comprising the following steps:

[0022] (1) Obtain the content of valuable elements and residual elements in scrap steel, and classify the scrap steel;

[0023] (2) Calculate the value coefficient of each type of scrap steel based on the preset constraint function;

[0024] (3) Calculate the price of the scrap steel based on the benchmark price of the scrap steel.

[0025] In the step (1), the spark discharge direct-reading spectroscopy is used to detect the element content of the scrap steel raw material, the valuable elements are C, Nb, Cr, Ni and Mo, and the residual elements are Cu, Sn and As, and the scrap steel is divided into three categories of general scrap steel, pig iron and alloy scrap steel according to the detection results.

[0026] In the step (2), the constraint parameters of the preset constraint function include the valuable element content, the residual element content, the scrap steel yield, the scrap steel surface quality, the scrap steel melting coefficient and the scrap steel charging mode;

[0027] 1) The value of the valuable element: taking the average content of the valuable elements in the scrap steel as the benchmark, the value of the valuable element $ = valuable element price * (content of the element in the scrap steel - average content of the element in the remaining scrap steel), wherein the average content of the valuable elements is C element content 2%, Cr element content 1%, Nb element content 0.01%, Ni element content 0.5% and Mo element content 0.2%;

[0028] 2) The value of the residual element: taking the average content of the residual elements in the scrap steel as the benchmark, when the Cu element content in the scrap steel increases by 20 ppm, the Sn element content increases by 5 ppm and the As element content increases by 5 ppm, the value of the scrap steel decreases by 10 yuan / ton respectively, and the value of the residual element & = 10 * (ΔCu / 20 + ΔSn / 5 + ΔAs / 5);

[0029] 3) The scrap steel quality coefficient α: when the scrap steel impurity removal rate ≤0.5, α = 1.08; 0.5 < scrap steel impurity removal rate ≤1, α = 1.04; 1 < scrap steel impurity removal rate ≤1.5, α = 1; 1.5 < scrap steel impurity removal rate ≤2, α = 0.98; 2 < scrap steel impurity removal rate ≤2.5, α = 0.96; and scrap steel impurity removal rate > 2.5, α = 0.94;

[0030] 4) The consumption coefficient β: when the scrap steel yield ≥0.98, β = 1.02; 0.96 ≤ scrap steel yield <0.98, β = 1; 0.94 ≤ scrap steel yield <0.96, β = 0.99; 0.92 ≤ scrap steel yield <0.94, β = 0.98; 0.90 ≤ scrap steel yield <0.92, β = 0.97; 0.88 ≤ scrap steel yield <0.90, β = 0.96; and scrap steel yield <0.88, β = 0.95;

[0031] 5) Melting coefficient §: when the thickness of scrap steel <1mm, §=1.02; 1≤thickness of scrap steel <2, §=1.01; 2≤thickness of scrap steel <3, §=1; 3≤thickness of scrap steel <4, §=0.99; 4≤thickness of scrap steel <5, §=0.98; 5≤thickness of scrap steel <6, §=0.97; thickness of scrap steel≥6, §=0.96;

[0032] 6) Scrap steel charging mode is divided into converter charging scrap steel and electric furnace charging scrap steel;

[0033] 7) Scrap steel value coefficient Y=α*β*§.

[0034] The reference price of scrap steel in step (3) is S, and the procurement guide price of scrap steel: carbon-containing scrap steel for electric furnace: ￥=S*Y+ $-&; carbon-containing scrap steel for converter: ￥=S*Y- $-&; and the rest of the scrap steel: ￥=S*Y.

[0035] Example 1

[0036] A kind of scrap steel to be purchased in the market, the marked price is 2430 yuan / ton.

[0037] The element content of scrap steel raw material is detected by spark discharge direct reading spectrometry, and the detection results are shown in the following table. According to the detection data, it can be judged that the scrap steel is general scrap steel.

[0038] Table 1 Scrap steel composition test results / %

[0039] C Cr Ni Nb Mo Cu Sn As 0.4 0.03 0.04 0.01 0.03 0.06 0.004 0.01

[0040] Based on the detection results, the scrap steel does not contain valuable elements, but contains residual element As, which exceeds the upper limit standard of As content 70ppm, and the value of residual element is: & = 10*(100-70) / 5 = 60.

[0041] The scrap steel deduction rate is 0.8%, the scrap steel recovery rate is 94%, the scrap steel thickness is 2.5mm, the corresponding mass coefficient α=1.04, the consumption coefficient β=0.99, and the melting coefficient §=1, so the scrap steel value coefficient Y=1.0296. The procurement guide price of this kind of scrap steel is: ￥=2430*1.0296-60=2441.9.

[0042] Example 2

[0043] A kind of scrap steel to be purchased in the market, the marked price is 2600 yuan / ton.

[0044] The element content of scrap steel raw material is detected by spark discharge direct reading spectrometry, and the detection results are shown in the following table. According to the detection data, it can be judged that the scrap steel is alloy scrap steel.

[0045] Table 2 Scrap steel composition test results / %

[0046] C Cr Ni Nb Mo Cu Sn As 3 1.5 0.035 0.008 0.023 0.06 0.004 0.004

[0047] Based on the detection results, the scrap steel contains valuable elements C and Cr, and the residual elements are not over standard.

[0048] The value of C element is $1 = 1600 * (3-2) / 100 = 16;

[0049] The value of Cr element is $2 = 9000 * (1.5-1) / 100 = 45;

[0050] The scrap steel deduction rate is 0.9%, the scrap steel recovery rate is 94%, the scrap steel thickness is 12mm, the corresponding mass coefficient α = 1.04, the consumption coefficient β = 0.99, and the melting coefficient § = 0.96, so the scrap steel value coefficient Y = 0.9884.

[0051] The purchase guide price of this kind of scrap steel for converter is: ￥ = 2600 * 0.9884 + 45- 16 = 2598.8.

[0052] The purchase guide price of this kind of scrap steel for electric furnace is: ￥ = 2600 * 0.9884 + 45 + 16 = 2630.8.

[0053] Example 3

[0054] A kind of scrap steel to be purchased in the market is priced at 2150 yuan / ton.

[0055] The element content of the scrap steel raw material is detected by spark discharge direct reading spectrometry, and the detection results are shown in the following table. According to the detection data, it can be judged that the scrap steel is general scrap steel.

[0056] Table 3 Scrap steel composition detection results / %

[0057] C Cr Ni Nb Mo Cu Sn As 0.40 0.08 0.04 0.008 0.04 0.05 0.003 0.003

[0058] Based on the detection results, the scrap steel does not contain valuable elements, and the residual elements are not over standard.

[0059] The scrap steel deduction rate is 1.4%, the scrap steel recovery rate is 94%, the scrap steel thickness is 0.5mm, the corresponding mass coefficient α = 1, the consumption coefficient β = 0.99, and the melting coefficient § = 1.02, so the scrap steel value coefficient Y = 1.0098.

[0060] The purchase guide price of this kind of scrap steel is: ￥ = 2150 * 1.0098 = 2171.1.

[0061] Example 4

[0062] A kind of scrap steel to be purchased in the market is priced at 2420 yuan / ton.

[0063] The element content of the scrap steel raw material is detected by spark discharge direct reading spectrometry, and the detection results are shown in the following table. According to the detection data, it can be judged that the scrap steel is alloy scrap steel.

[0064] Table 3 scrap steel composition detection results / %

[0065] C Cr Ni Nb Mo Cu Sn As 0.40 1.8 0.8 0.005 0.04 0.08 0.005 0.006

[0066] Based on the detection results, the scrap steel contains valuable elements, and the residual elements exceed the standard.

[0067] The value of valuable elements is:

[0068] The value of Cr element is $1=9000*(1.8-1) / 100=72;

[0069] The value of Ni element is $2=18000*(0.8-0.5) / 100=54;

[0070] The value of residual elements is:

[0071] &=10*((80-60) / 20+(50-40) / 5)=30.

[0072] The scrap steel has a 1.9% impurity removal rate, a 96% scrap steel yield, and a 1.5mm scrap steel thickness. The corresponding mass coefficient α=0.98, consumption coefficient β=1, and melting coefficient §=1.01. Therefore, the value coefficient Y of the scrap steel is 0.9898.

[0073] The procurement guide price of this type of scrap steel is: ￥=2420*0.9898+72+54-30=2491.3.

[0074] Example 5

[0075] A kind of scrap steel to be purchased in market is priced at 2510 yuan / ton.

[0076] The element content of the scrap steel raw material is detected by spark discharge direct reading spectrometry, and the detection results are shown in the following table. According to the detection data, it can be judged that the scrap steel is alloy scrap steel.

[0077] Table 3 scrap steel composition detection results / %

[0078]

[0079]

[0080] Based on the detection results, the scrap steel contains valuable elements, and the residual elements exceed the standard.

[0081] The value of valuable elements is:

[0082] The value of C element is $1=1600*(4-2) / 100=32;

[0083] Residual element value:

[0084] &=10*((80-40) / 5)=80.

[0085] The scrap steel impurity removal rate is 0.3%, the scrap steel recovery rate is 93%, the scrap steel thickness is 5.5mm, the corresponding mass coefficient is α=1.08, the consumption coefficient is β=0.98, and the melting coefficient is γ=0.97, so the scrap steel value coefficient Y=1.0266.

[0086] The purchase guide price of the scrap steel for the electric furnace is: ￥=2510*1.0266+32-80=2528.7.

[0087] The purchase guide price of the scrap steel for the converter is: ￥=2510*1.0266-32-80=2464.7.

[0088] The present application integrates the data of the material quality, material type, smelting process, adding mode and other multiple dimensions of scrap steel, provides comprehensive and accurate information for the comprehensive evaluation of the value of scrap steel, changes the previous single data source and insufficient evaluation dimension, based on the analysis results of multiple dimension data, not only solves the problem of unreasonable evaluation of cost performance in scrap steel procurement, but also provides scientific and reasonable pricing basis for the scrap steel resource recycling in the steel industry.

[0089] Scrap steel value accounting helps enterprises better manage the scrap steel supply chain, reasonably arrange procurement, inventory and production plan, and improve the efficiency and flexibility of the supply chain. By accurately accounting for the value of scrap steel, enterprises can better evaluate the recycling potential, optimize resource allocation, reduce waste, and improve resource utilization efficiency. Scientific accounting methods can provide transparent and fair pricing basis for the scrap steel recycling industry, promote the standardized development of the recycling market, and encourage more enterprises to participate in scrap steel recycling.

Claims

1. A method for calculating the value of scrap steel based on multi-dimensional features, characterized in that... Includes the following steps: (1) Obtain the content of valuable elements and residual elements in the scrap steel, and classify the scrap steel accordingly; (2) Calculate the value coefficients of various types of scrap steel based on the preset constraint functions; (3) Calculate the price of this type of scrap steel based on the benchmark price of scrap steel.

2. The method for calculating the value of scrap steel based on multi-dimensional features according to claim 1, characterized in that: In step (1), the element content of scrap steel raw materials is detected by spark discharge direct reading spectroscopy. The valuable elements are C, Nb, Cr, Ni and Mo, and the residual elements are Cu, Sn and As. According to the detection results, scrap steel is divided into three categories: general scrap steel, pig iron and alloy scrap steel.

3. The method for calculating the value of scrap steel based on multi-dimensional features according to claim 1, characterized in that: In step (2), the constraint parameters of the preset constraint function include the content of valuable elements, the content of residual elements, the scrap steel recovery rate, the surface quality of scrap steel, the melting coefficient of scrap steel, and the scrap steel feeding method. (1) Value of valuable elements: Based on the average content of valuable elements in scrap steel: C content 2%, Cr content 1%, Nb content 0.01%, Ni content 0.5% and Mo content 0.2%, the value of valuable elements $ = price of valuable elements * (content of the element in scrap steel - average content of the element in other scrap steel). (2) Value of residual elements: Based on the average content of residual elements in scrap steel: Cu content 600ppm, Sn content 40ppm and As content 70ppm, when the Cu content in scrap steel increases by 20ppm, Sn content increases by 5ppm and As content increases by 5ppm, the value of scrap steel decreases by 10 yuan / ton respectively. The value of residual elements is 10*(∆Cu / 20+∆Sn / 5+∆As / 5). (3) Scrap steel quality coefficient α: When the scrap steel impurity rate is ≤0.5, α=1.08; 0.5<Scrap steel impurity rate≤1, α=1.04; 1<Scrap steel impurity rate≤1.5, α=1; 1.5 < scrap steel impurity rate ≤ 2, α = 0.98; 2 < scrap steel impurity deduction rate ≤ 2.5, α = 0.96; scrap steel impurity deduction rate > 2.5, α = 0.94; (4) Consumption coefficient β: When the scrap steel recovery rate is ≥0.98, β=1.02; 0.96≤scrap steel recovery rate<0.98, β=1; 0.94≤scrap steel recovery rate<0.96, β=0.99; 0.92≤scrap steel recovery rate<0.94, β=0.98; 0.90≤scrap steel recovery rate<0.92, β=0.97; 0.88≤scrap steel recovery rate<0.90, β=0.96; scrap steel recovery rate<0.88, β=0.95; (5) Melting coefficient §: When the thickness of scrap steel is <1mm, §=1.02; 1≤thickness of scrap steel <2, §=1.01; 2≤thickness of scrap steel <3, §=1; 3≤thickness of scrap steel <4, §=0.99; 4≤thickness of scrap steel <5, §=0.98; 5≤thickness of scrap steel <6, §=0.97; Thickness of scrap steel ≥6, §=0.96; (6) Scrap steel is fed into the furnace in two ways: scrap steel fed into the converter furnace and scrap steel fed into the electric furnace. (7) The scrap steel value coefficient Y = α * β * §.

4. The method for calculating the value of scrap steel based on multi-dimensional features according to claim 1, characterized in that: In step (3), the base price of scrap steel is S, and the purchase guidance price of scrap steel is: carbon scrap steel for electric furnace: ¥=S*Y+$-&; carbon scrap steel for converter: ¥=S*Y-$-&; other scrap steel: ¥=S*Y.

Images