Iron ore value evaluation method

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and relates to an iron ore value evaluation method, which specifically comprises the following steps: taking dry iron ore actually used in production as a reference material, determining the content of each chemical component in to-be-evaluated iron ore and the reference material, and evaluating the value of the iron ore according to the chemical component difference between the to-be-evaluated iron ore and the reference material. According to the evaluation method provided by the invention, the whole-process cost elements are integrated, the quantitative evaluation model based on the component difference is established, the evaluation method fits actual production and operation, a scientific basis is provided for the addition amount of the flux and the fuel, an expected reference is provided for the recovery of the slag and the coal gas, and the method has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace ironmaking, and particularly relates to a value evaluation method of iron ore. BACKGROUND

[0002] There are various types of iron ore used for producing steel, and the components are different. At present, common evaluation methods of iron ore include tonnage price method, comprehensive tonnage price method, single burning method, etc. These methods are centered on the iron content of iron ore, and balance the binary or quaternary basicity of slag. The influence of gangue content and flux on grade is considered, but the influence of iron ore on the cost of sintering process, blast furnace ironmaking and steel post-process is not completely described, resulting in distorted value evaluation results of iron ore. For example, Chinese patent CN120297569A determines the content values of each chemical component in the reference iron ore and the iron ore to be evaluated, and calculates the content difference of the iron ore to be evaluated relative to the reference iron ore on the same chemical component. The iron ore is evaluated according to the 1% price difference of different chemical component contents. Although an evaluation model based on component price difference is constructed, the cost accounting depends on the discount data, and only covers the direct use cost, not the whole process value evaluation.

[0003] In order to meet the needs of enterprises for iron ore evaluation, the present application starts from the total cost of the whole ironmaking system, and pre-evaluates the ironmaking value of iron ore from different sources, different varieties, different components and different prices, aiming to provide an economic evaluation method of iron ore that is consistent with actual production and operation. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a value evaluation method of iron ore.

[0005] To solve the above problems, the technical scheme adopted by the present application is: S1. Taking the dry basis iron ore actually used in production as the reference material, determining the content of each chemical component in the reference material and the iron ore to be evaluated, and determining the fixed cost C7 of producing each ton of molten iron; S2. Calculating the amount Q1 of iron ore consumed for producing each ton of molten iron through the content of total iron of the iron ore to be evaluated, and determining the cost C1 of iron ore raw material corresponding to each ton of molten iron of the iron ore to be evaluated in combination with the arrival price of each ton of dry basis of the iron ore to be evaluated; S3. Determining the sintering manufacturing cost of each ton of ore of the reference material, the blast furnace ironmaking fuel consumption cost corresponding to each ton of molten iron of the reference material, the amount of slag generated corresponding to each ton of molten iron of the reference material, and the amount of recovered coal gas generated corresponding to each ton of molten iron of the reference material, and calculating the sintering manufacturing cost C2 of each ton of molten iron of the iron ore to be evaluated according to the sintering manufacturing cost of each ton of ore of the reference material; S4. Determine the difference C3 of the calcium flux cost per ton of molten iron, the difference C4 of the magnesium flux cost per ton of molten iron, the difference C5 of the sintering solid fuel cost per ton of molten iron, the difference C6 of the desulfurization cost per ton of molten iron of the iron ore to be evaluated from the reference material based on the difference in the content of chemical components between the iron ores. 10 ; Determine the blast furnace ironmaking fuel consumption cost C6 per ton of molten iron, the slag yield C8 per ton of molten iron, and the recovered coal gas yield C9 per ton of molten iron of the reference material based on the difference in the content of chemical components between the iron ores combined with the blast furnace ironmaking fuel consumption cost per ton of molten iron of the reference material in S3, the amount of slag generated per ton of molten iron of the reference material, and the amount of recovered coal gas generated per ton of molten iron of the reference material; S5. Calculate the total cost of ironmaking = C1+C2+C3+C4+C5+C6+C7-C8-C9+C 10 , and evaluate the value of the iron ore by comparing the total cost of ironmaking of the iron ore to be evaluated.

[0006] As a further improvement of the present application, the content of the chemical components is specifically the mass percentage of TFe, SiO2, CaO, Al2O3, MgO, FeO, S, and Lol.

[0007] As a further improvement of the present application, the fixed cost C7 per ton of molten iron in S1 is a cost that does not change with the type of raw material for producing per ton of molten iron, including ironmaking energy power fixed cost, labor cost, and manufacturing expense fixed cost.

[0008] As a further improvement of the present application, the cost C1 of the iron ore raw material per ton of molten iron in S2 = the amount Q1 of iron ore consumed per ton of molten iron × the cost per ton of iron ore; The amount Q1 of iron ore consumed per ton of molten iron = molten iron w (TFe) / ore w (TFe) / Fe metal recovery rate.

[0009] As a further improvement of the present application, the sintering manufacturing cost per ton of ore of the reference material in S3 = the sintering fixed cost per ton of iron ore + the flux cost per ton of iron ore + the sintering solid fuel cost per ton of iron ore + the desulfurization cost per ton of iron ore; The sintering manufacturing cost C2 per ton of molten iron of the iron ore to be evaluated = the sintering manufacturing cost per ton of ore of the reference material × the amount Q1 of iron ore consumed per ton of molten iron / (1-high return rate); The sintering fixed cost refers to the fixed expenditure corresponding to sintering per ton of iron ore, which does not change with the type of iron ore.

[0010] As a further improvement of the present application, the calcium flux in S4 is selected from one or more of quicklime powder and limestone powder; the magnesium flux is selected from one or more of magnesite powder, dolomite powder, and light-burned dolomite powder. The difference in calcium flux cost per ton of molten iron between the iron ore to be evaluated and the benchmark material is C3 = [(iron ore to be evaluated w(SiO2) - benchmark material w(SiO2)) × binary basicity R2 - iron ore to be evaluated w(CaO) + benchmark material w(CaO)] / calcium flux w(CaO) × calcium flux price × Q1 / (1 - high return rate); The difference in magnesium flux cost per ton of molten iron between the iron ore to be evaluated and the benchmark material is C4 = [(iron ore to be evaluated w(Al2O3) - benchmark material w(Al2O3)) × magnesium-aluminum ratio - iron ore to be evaluated w(MgO) + benchmark material w(MgO)] / magnesium flux w(MgO) × magnesium flux price × Q1 / (1 - high return rate); R2 refers to furnace basicity, specifically the mass ratio of calcium oxide to silicon dioxide in the slag. The magnesium-aluminum ratio refers to the mass ratio of MgO to Al2O3 in the slag.

[0011] As a further improvement of the present invention, the difference C5 between the sintering solid combustion cost per ton of molten iron of the iron ore to be evaluated and the benchmark material in S4 is calculated by the difference in the chemical composition of FeO and water of crystallization in the iron ore to be evaluated and the benchmark material. Specifically, C5 = [(benchmark material w(FeO) - iron ore to be evaluated w(FeO)) × w(FeO) on the fuel used for sintering + (iron ore to be evaluated w(Lol) - benchmark material w(Lol)) × w(Lol) on the fuel used for sintering] × price of fuel used for sintering × Q1 / (1 - high return rate).

[0012] As a further improvement of the present invention, the influence values ​​of w(FeO) and w(Lol) on the fuel used in sintering are empirical coefficients.

[0013] As a further improvement of the present invention, the influence value of w(FeO) on the fuel used in sintering is 0.02; The effect of w(Lol) on the fuel used in sintering is -0.015.

[0014] As a further improvement of the present invention, the blast furnace ironmaking fuel consumption cost C6 corresponding to each ton of molten iron in S4 is calculated by the content of SiO2, Al2O3, and MgO in the iron ore to be evaluated and the blast furnace ironmaking fuel consumption cost corresponding to each ton of molten iron in the iron ore to be evaluated and the reference material. Specifically, C6 = (Q7 + Q8) × slag quantity affects coke ratio × (1 + Q9 × slag quantity affects coke ratio) × coke price + blast furnace ironmaking fuel consumption cost corresponding to each ton of molten iron in the reference material. Q7 = (Iron ore to be evaluated w(SiO2) - Benchmark material w(SiO2)) × (1 + Binary basicity R2 / Calcium flux w(CaO)); Q8 = (Iron ore to be evaluated w(Al2O3) - Benchmark material w(Al2O3)) × (1 + Magnesium-aluminum ratio / Magnesium flux w(MgO)); Q9 = (coke w(SiO2) × binary basicity R2 - coke w(CaO)) / calcium flux w(CaO) + (coke w(Al2O3) × magnesium-aluminum ratio - coke w(MgO)) / magnesium flux w(MgO) + coke w(SiO2 + Al2O3 + CaO + MgO).

[0015] As a further improvement of the present invention, the slag revenue and the recovered gas revenue are calculated based on the SiO2, Al2O3, and MgO content of the iron ore to be evaluated, and the amount of slag and gas recovered per ton of molten iron corresponding to the SiO2, Al2O3, and MgO content of the iron ore to be evaluated and the benchmark material. Specifically: Slag revenue C8 = [(Q7 + Q8) × (1 + Q9 × slag quantity affects coke ratio) + slag quantity generated per ton of molten iron of benchmark material] × slag price; The revenue from recovered coal gas C9 = [(Q7+Q8) × the effect of slag quantity on coke ratio × (1+Q9× the effect of slag quantity on coke ratio) × K + the amount of recovered coal gas generated per ton of molten iron of the benchmark material] × coal gas price; K is an empirical coefficient for converting coke quantity into coal gas quantity. As a further improvement of the present invention, K=3.5.

[0016] As a further improvement of the present invention, the amount of slag affects the coke ratio by 0.18.

[0017] As a further improvement of the present invention, the difference C between the desulfurization cost per ton of molten iron of the iron ore to be evaluated and the benchmark material is... 10 The sulfur content of the iron ore to be evaluated is calculated by comparing it with the sulfur content of the benchmark material, specifically C. 10 = (Iron ore w(S) to be evaluated - benchmark material w(S)) / flue gas volume generated per ton of iron ore × 1000000000 × 2 × desulfurization coefficient × desulfurizing agent cost × Q1 / (1 - high return rate).

[0018] The dry basis price delivered to the plant (excluding tax) in this invention is in yuan per ton of iron ore, C1-C 10The unit is yuan per ton of molten iron; Aw(X) represents the mass percentage of component X in A, in %; high return rate refers to the proportion of sintered ore that does not meet the qualified standard particle size in the total sintered ore, in %; the amount of iron ore consumed per ton of molten iron is in tons, and the cost per ton of iron ore is in tons / yuan; TFe represents total iron; the recovery rate of molten iron w(TFe) and Fe metal is an empirical coefficient obtained from actual production; the units of flux cost, sintering solid combustion cost, and desulfurization cost are yuan per ton of iron ore. Binary basicity R2 and magnesium-aluminum ratio are proportional relationships, without units; magnesium flux price and calcium flux price are in yuan / ton; the influence values ​​of w(FeO) and w(Lol) on the fuel used in sintering are empirical coefficients, without units; the price of the fuel used in sintering is the price per ton of iron ore used in sintering, in yuan / ton of iron ore; the influence of slag quantity on coke ratio is an empirical coefficient, without units; the unit of flue gas volume per ton of ore is cubic meters / ton, and the unit of desulfurization coefficient is t / (mg / m³).

[0019] As a further improvement of the present invention, the molten iron w(TFe) = 94.5% and the Fe metal recovery rate = 99.5%; As a further improvement of the present invention, the iron ore price is the dry basis price of iron ore delivered to the factory excluding tax.

[0020] As a further improvement of the present invention, the binary alkalinity R2, magnesium-aluminum ratio, and high return rate are determined according to the enterprise's production situation.

[0021] The beneficial effects of adopting the above technical solution are as follows: This invention provides a method for evaluating the value of iron ore. This evaluation method integrates all cost elements throughout the entire process, establishes a quantitative evaluation model based on component differences, aligns with actual production and operation, provides a scientific basis for the amount of flux and fuel added, and provides an expected reference for the recovery of slag and gas, and has broad application prospects. Attached Figure Description

[0022] Figure 1 This is a flowchart of the economic evaluation method for iron ore according to the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the invention will be described clearly and completely below in conjunction with specific embodiments.

[0024] Example 1 A method for evaluating the value of iron ore, comprising the following steps: S1. Using the dry-basis iron ore actually used in production as the benchmark material, determine the content of each chemical component in the benchmark material and the iron ore to be evaluated, and determine the fixed cost C7 for ironmaking per ton of molten iron. S2. Calculate the amount of iron ore consumed to produce one ton of molten iron by the total iron content of the iron ore to be evaluated, Q1. Combine this with the dry basis price of one ton of iron ore to be evaluated to determine the cost of iron ore raw materials corresponding to one ton of molten iron. S3. Determine the sintering manufacturing cost per ton of benchmark ore, the blast furnace ironmaking fuel consumption cost per ton of benchmark molten iron, the amount of slag generated per ton of benchmark molten iron, and the amount of recovered gas generated per ton of benchmark molten iron. Based on the sintering manufacturing cost per ton of benchmark ore, calculate the sintering manufacturing cost C2 per ton of molten iron of the iron ore to be evaluated. S4. Based on the differences in chemical composition between iron ores, determine the differences in calcium flux cost per ton of molten iron between the iron ore to be evaluated and the benchmark material, including C3, C4, C5, C6, C7, C8, C9, C1, C9, C10, C11, C2, C12, C13, C24, C15, C16, C17, C18, C19, C19, C10, C11, C19, C11, C12, C19, C1 ... 10 Based on the differences in chemical composition between iron ore, combined with the blast furnace fuel consumption cost per ton of molten iron in S3, the amount of slag produced per ton of molten iron in the benchmark material, and the amount of recovered gas produced per ton of molten iron in the benchmark material, the blast furnace fuel consumption cost C6, the revenue from slag produced per ton of molten iron C8, and the revenue from recovered gas produced per ton of molten iron C9 are determined. S5. Calculate the total cost of iron smelting = C1 + C2 + C3 + C4 + C5 + C6 + C7 - C8 - C9 + C 10 The value of iron ore is evaluated by comparing the total cost of ironmaking for the iron ore to be evaluated.

[0025] The consumption per ton of molten iron ore, Q1, is calculated as: molten iron w(TFe) / ore w(TFe) / Fe metal recovery rate, where molten iron w(TFe) is taken as 94.5% and Fe metal recovery rate is taken as 99.5%. Iron ore raw material cost C1 = Q1 × iron ore dry basis price delivered to the plant (excluding tax); The sintering manufacturing cost per ton of molten iron from the iron ore to be evaluated is C2 = (sintering fixed cost per ton of iron ore + flux cost per ton of iron ore + sintering solid combustion cost per ton of iron ore + desulfurization cost per ton of iron ore) × amount of iron ore consumed per ton of molten iron Q1 / (1 - high return rate). In this embodiment, the fixed cost of sintering per ton of iron ore + the flux cost per ton of iron ore + the solid combustion cost of sintering per ton of iron ore + the desulfurization cost per ton of iron ore is 124 yuan / ton, and the high return rate is 12%.

[0026] The difference between the cost of the iron ore to be evaluated and the cost of the reference material calcium flux is C3 = [(iron ore to be evaluated w(SiO2) - reference material w(SiO2)) × binary basicity R2 - iron ore to be evaluated w(CaO) + reference material w(CaO)] / calcium flux w(CaO) × calcium flux price × Q1 / (1 - high return rate); In this embodiment, the binary basicity R2 is calculated as 1.2, the calcium flux w (CaO) is calculated as 0.8, and the price of calcium flux is calculated as 350 yuan / ton; The mass percentages of each chemical component in the reference material are as follows: S=0.09%, SiO2=5.8%, CaO=0.3%, MgO=0.4%, Al2O3=2.7%, LOI=4.6%, FeO=1.5%; The difference between the cost of the iron ore to be evaluated and the cost of the benchmark magnesium flux is C4 = [(iron ore to be evaluated w(Al2O3) - benchmark w(Al2O3)) × magnesium-aluminum ratio - iron ore to be evaluated w(MgO) + benchmark w(MgO)] / magnesium flux w(MgO) × magnesium flux price × Q1 / (1 - high return rate); The aluminum-magnesium ratio refers to the mass ratio of MgO to Al2O3 in the slag. In this invention, it is specifically 0.58. In this embodiment, the magnesium flux w(MgO) is denoted as 0.45, and the price of magnesium flux is 200 yuan / ton. The difference in sintering fuel cost C5 = [(Base material w(FeO) - Iron ore w(FeO) to be evaluated) × the impact of w(FeO) on the fuel used in sintering + (Iron ore w(Lol) to be evaluated - Base material w(Lol)) × the impact of w(Lol) on the fuel used in sintering] × the price of the fuel used in sintering × Q1 / (1 - high return rate); w(Lol) refers to the mass percentage of loss on ignition in iron ore.

[0027] The influence values ​​of w(FeO) and w(Lol) on the fuel used in sintering are empirical coefficients. In this embodiment, the influence value of w(FeO) on the fuel used in sintering is 0.02; The effect of w(Lol) on the fuel used in sintering is -0.015; The price of fuel used in sintering is 1200 yuan / ton; The blast furnace fuel consumption cost per ton of molten iron is C6 = (Q7 + Q8) × the influence of slag quantity on coke ratio × (1 + Q9 × the influence of slag quantity on coke ratio) × coke price + the blast furnace fuel consumption cost per ton of molten iron corresponding to the benchmark material. Q7 = (Iron ore to be evaluated w(SiO2) - Benchmark material w(SiO2)) × (1 + Binary basicity R2 / Calcium flux w(CaO)); Q8 = (Iron ore to be evaluated w(Al2O3) - Benchmark material w(Al2O3)) × (1 + Magnesium-aluminum ratio / Magnesium flux w(MgO)); Q9 = (coke w(SiO2) × binary basicity R2 - coke w(CaO)) / calcium flux w(CaO) + (coke w(Al2O3) × magnesium-aluminum ratio - coke w(MgO)) / magnesium flux w(MgO) + coke w(SiO2 + Al2O3 + CaO + MgO).

[0028] The fuel consumption cost for blast furnace ironmaking per ton of molten iron based on the benchmark material is the cost of coke plus the cost of coal. The cost of coke, i.e., the cost of benchmark coke, is 675 yuan; the cost of coal, i.e., the cost of pulverized coal injection, is 160 yuan; the amount of slag affects the coke ratio by 0.18; and the price of coke, i.e., the price of coke, is 1900 yuan / ton. Fixed cost of ironmaking per ton of molten iron C 7= Fixed costs of ironmaking energy, labor, and manufacturing expenses = 156 yuan / ton of molten iron; The mass percentages of each component in the coke are as follows: SiO2 = 7.2%, Al2O = 4.3%, CaO = 0.9%, MgO = 0.1%; Slag revenue C8 = [(Q7 + Q8) × (1 + Q9 × slag quantity affects coke ratio) + slag quantity generated per ton of molten iron of benchmark material] × slag price; The revenue from recovered coal gas C9 = [(Q7+Q8) × the effect of slag quantity on coke ratio × (1+Q9× the effect of slag quantity on coke ratio) × K + the amount of recovered coal gas generated per ton of molten iron of the benchmark material] × coal gas price; K is an empirical coefficient for converting coke quantity into gas quantity, with K=3.5 being the preferred value; The amount of slag produced per ton of molten iron in the benchmark material is 0.41 tons, and the price of slag is 20 yuan / ton; The standard material produces 1500m³ of gas per ton of molten iron. 3 The price of gas is 0.1 yuan / m³. 3 ; The difference in desulfurization costs C 10 = (Iron ore w(S) to be evaluated - benchmark material w(S)) / flue gas volume generated per ton of iron ore × 1000000000 × 2 × desulfurization coefficient × desulfurizing agent cost × Q1 / (1 - high return rate); The flue gas volume per ton of ore is 1600m³ 3 The desulfurization coefficient is 0.000001, with units of t / (mg / m³), and the cost of the desulfurizing agent is 500 yuan / ton.

[0029] Table 1 shows the dry basis price and chemical composition of different iron ores to be evaluated. Table 1 The cost of molten iron per ton of different iron ore to be evaluated was calculated using the method described in this invention and the data in Table 1. The cost calculation table is shown in Table 2. Table 2 The total cost and corresponding ranking of the economic evaluation of different iron ores to be evaluated using the method described in this invention, as well as the actual usage cost and corresponding ranking, are shown in Table 3. Table 3 The results show that the evaluation model established in this invention is consistent with actual production and operation.

[0030] The evaluation method provided by this invention integrates all cost elements of the entire process and establishes a quantitative evaluation model based on component differences. The results show that the evaluation model established by this invention is consistent with actual production and operation, and provides a scientific basis for the amount of flux and fuel added, and provides expected reference for the recovery of slag and gas, and has broad application prospects.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the value of iron ore, characterized in that, Includes the following steps: S1. Using the dry-basis iron ore actually used in production as the benchmark material, determine the content of each chemical component in the benchmark material and the iron ore to be evaluated, and determine the fixed cost C7 for ironmaking per ton of molten iron. S2. Calculate the amount of iron ore consumed to produce one ton of molten iron by the total iron content of the iron ore to be evaluated, Q1. Combine this with the dry basis price of one ton of iron ore to be evaluated to determine the cost of iron ore raw materials corresponding to one ton of molten iron. S3. Determine the sintering manufacturing cost per ton of benchmark ore, the blast furnace ironmaking fuel consumption cost per ton of benchmark molten iron, the amount of slag generated per ton of benchmark molten iron, and the amount of recovered gas generated per ton of benchmark molten iron. Based on the sintering manufacturing cost per ton of benchmark ore, calculate the sintering manufacturing cost C2 per ton of molten iron of the iron ore to be evaluated. S4. Based on the differences in chemical composition between iron ores, determine the differences in calcium flux cost per ton of molten iron between the iron ore to be evaluated and the benchmark material, including C3, C4, C5, C6, C7, C8, C9, C1, C9, C10, C11, C2, C12, C13, C24, C15, C16, C17, C18, C19, C19, C10, C11, C19, C11, C12, C19, C1 ... 10 Based on the differences in chemical composition between iron ore, combined with the blast furnace fuel consumption cost per ton of molten iron in S3, the amount of slag produced per ton of molten iron in the benchmark material, and the amount of recovered gas produced per ton of molten iron in the benchmark material, the blast furnace fuel consumption cost C6, the revenue from slag produced per ton of molten iron C8, and the revenue from recovered gas produced per ton of molten iron C9 are determined. S5. Calculate the total cost of iron smelting = C1 + C2 + C3 + C4 + C5 + C6 + C7 - C8 - C9 + C 10 The value of iron ore is evaluated by comparing the total cost of ironmaking for the iron ore to be evaluated.

2. The value evaluation method according to claim 1, characterized in that, The specific content of the chemical components is the mass percentage of total iron (TFe), SiO2, CaO, Al2O3, MgO, FeO, S, and Lol.

3. The value evaluation method according to claim 1, characterized in that, The fixed cost C7 per ton of molten iron mentioned in S1 refers to the cost that does not change with the type of raw material, including the fixed cost of ironmaking energy and power, labor costs, and manufacturing overhead.

4. The value evaluation method according to claim 1, characterized in that, In S2, the cost of iron ore raw materials per ton of molten iron is C1 = the amount of iron ore consumed per ton of molten iron Q1 × the cost per ton of iron ore. The amount of iron ore consumed per ton of molten iron is Q1 = molten iron w(TFe) / iron ore w(TFe) / Fe metal recovery rate; The term "molten iron w(TFe)" refers to the percentage of total iron in the molten iron; the term "iron ore w(TFe)" refers to the percentage of total iron in the iron ore.

5. The value evaluation method according to claim 1, characterized in that, The sintering manufacturing cost per ton of ore in S3 is equal to the fixed sintering cost per ton of iron ore, the flux cost per ton of iron ore, the solid combustion cost of sintering per ton of iron ore, and the desulfurization cost per ton of iron ore. The sintering manufacturing cost per ton of molten iron from the iron ore to be evaluated, C2, is calculated as follows: sintering manufacturing cost per ton of ore from the benchmark material × amount of iron ore consumed per ton of molten iron, Q1 / (1 - high return rate). The sintering fixed cost refers to the fixed expenditure corresponding to each ton of iron ore sintered, which does not change with the type of iron ore.

6. The value evaluation method according to claim 1, characterized in that, The calcium flux mentioned in S4 is selected from one or two of quicklime powder and limestone powder; the magnesium flux is selected from one or more of magnesite powder, dolomite powder, and lightly calcined dolomite powder. The difference in calcium flux cost per ton of molten iron between the iron ore to be evaluated and the benchmark material is C3 = [(iron ore to be evaluated w(SiO2) - benchmark material w(SiO2)) × binary basicity R2 - iron ore to be evaluated w(CaO) + benchmark material w(CaO)] / calcium flux w(CaO) × calcium flux price × Q1 / (1 - high return rate); The difference in magnesium flux cost per ton of molten iron between the iron ore to be evaluated and the benchmark material is C4 = [(iron ore to be evaluated w(Al2O3) - benchmark material w(Al2O3)) × magnesium-aluminum ratio - iron ore to be evaluated w(MgO) + benchmark material w(MgO)] / magnesium flux w(MgO) × magnesium flux price × Q1 / (1 - high return rate); The binary basicity R2 refers to the furnace basicity, specifically the mass ratio of calcium oxide to silicon dioxide in the slag. The magnesium-aluminum ratio refers to the mass ratio of MgO to Al2O3 in the slag. The iron ore to be evaluated, w(SiO2), refers to the mass percentage of SiO2 in the iron ore to be evaluated; the iron ore to be evaluated, w(CaO), refers to the mass percentage of CaO in the iron ore to be evaluated; the calcium flux, w(CaO), refers to the mass percentage of effective CaO in the calcium flux; the reference material, w(SiO2), refers to the mass percentage of w(SiO2) in the reference material. The reference material w(CaO) refers to the mass percentage of w(CaO) in the reference material; the iron ore w(Al2O3) to be evaluated refers to the mass percentage of Al2O3 in the iron ore to be evaluated; the iron ore w(MgO) to be evaluated refers to the mass percentage of MgO in the iron ore to be evaluated; the magnesium flux w(MgO) refers to the mass percentage of effective MgO in the magnesium flux; the reference material w(Al2O3) refers to the mass percentage of w(Al2O3) in the reference material; the reference material w(MgO) refers to the mass percentage of w(MgO) in the reference material.

7. The value evaluation method according to claim 1, characterized in that, The difference in sintering and combustion costs per ton of molten iron between the iron ore to be evaluated and the benchmark material in S4 is calculated as follows: C5 = [(Influence of benchmark material w(FeO) - iron ore to be evaluated w(FeO)) × w(FeO) on the fuel used for sintering + (Influence of iron ore to be evaluated w(Lol) - benchmark material w(Lol)) × w(Lol) on the fuel used for sintering] × price of fuel used for sintering × Q1 / (1 - high return rate); The reference material w(FeO) refers to the mass percentage of FeO in the reference material; The iron ore w(FeO) to be evaluated refers to the mass percentage of FeO in the iron ore to be evaluated; The reference material w (Lol) refers to the mass percentage of Lol in the reference material; The iron ore to be evaluated, w(Lol), refers to the percentage of Lol by mass in the iron ore to be evaluated.

8. The value evaluation method according to claim 1, characterized in that, The blast furnace fuel consumption cost per ton of molten iron in S4 is C6 = (Q7 + Q8) × the influence of slag quantity on coke ratio × (1 + Q9 × the influence of slag quantity on coke ratio) × coke price + the blast furnace fuel consumption cost per ton of molten iron corresponding to the benchmark material. Q7 = (Iron ore to be evaluated w(SiO2) - Benchmark material w(SiO2)) × (1 + Binary basicity R2 / Calcium flux w(CaO)); Q8 = (Iron ore to be evaluated w(Al2O3) - Benchmark material w(Al2O3)) × (1 + Magnesium-aluminum ratio / Magnesium flux w(MgO)); Q9 = (coke w(SiO2) × binary basicity R2 - coke w(CaO)) / calcium flux w(CaO) + (coke w(Al2O3) × magnesium-aluminum ratio - coke w(MgO)) / magnesium flux w(MgO) + coke w(SiO2 + Al2O3 + CaO + MgO); The iron ore w(SiO2) to be evaluated refers to the mass percentage of SiO2 in the iron ore to be evaluated; The reference material w (SiO2) refers to the mass percentage of SiO2 in the reference material; The calcium flux w (CaO) refers to the mass percentage of effective CaO in the calcium flux; The iron ore w(Al2O3) to be evaluated refers to the mass percentage of Al2O3 in the iron ore to be evaluated; The reference material w(Al2O3) refers to the mass percentage of Al2O3 in the reference material; Magnesium flux w(MgO) refers to the mass percentage of effective MgO in the magnesium flux; The coke w(SiO2) refers to the mass percentage of SiO2 in the coke. Coke w(CaO) refers to the mass percentage of CaO in coke; Coke w(Al2O3) refers to the mass percentage of Al2O3 in coke; The mass percentage of MgO in coke (w(MgO)) refers to the mass percentage of MgO in coke. Coke w(SiO2+Al2O3+CaO+MgO) refers to the total mass percentage of SiO2, Al2O3, CaO and MgO in coke.

9. The value evaluation method according to claim 8, characterized in that, Slag revenue C8 = [(Q7 + Q8) × (1 + Q9 × slag quantity affects coke ratio) + slag quantity generated per ton of molten iron of benchmark material] × slag price; The revenue from recovered coal gas C9 = [(Q7+Q8) × the effect of slag quantity on coke ratio × (1+Q9× the effect of slag quantity on coke ratio) × K + the amount of recovered coal gas generated per ton of molten iron of the benchmark material] × coal gas price; K is an empirical coefficient for converting coke quantity into coal gas quantity.

10. The value evaluation method according to claim 1, characterized in that, The difference C between the desulfurization cost per ton of molten iron of the iron ore to be evaluated and the benchmark material 10 = (Iron ore to be evaluated w(S) - Base material w(S)) / Flue gas volume generated per ton of iron ore × 10 9 ×2×Desulfurization coefficient×Desulfurizing agent cost×Q1 / (1-High return rate) The iron ore w(S) to be evaluated refers to the mass percentage of S in the iron ore to be evaluated; The reference material w(S) refers to the mass percentage of S in the reference material.

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