SiO2 with acid charge cost-effective evaluation method

Abstract

The application discloses a SiO2 acidic burden cost performance evaluation method, according to the blast furnace burden structure and sinter basicity, the influence of SiO2 in SiO2 acidic burden on the cost performance of the acidic burden is determined to be positive or negative, the influence of SiO2 on the cost performance of the acidic burden is converted into the burden price, different calculation formulas are used to calculate the cost performance of the acidic burden according to the positive or negative, the deficiency of the present ton-degree price evaluation method is made up, and more effective guidance is provided for purchasing the acidic burden (for blast furnace) with higher cost performance; for the steel plants with large burden structure difference in the subarea setting, the method can be used to guide the use of a certain acidic burden in which area has higher cost performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of blast furnace smelting technology, in particular to a SiO2 acidic burden cost performance evaluation method. BACKGROUND

[0002] The evaluation of the cost performance of the acidic burden of the blast furnace generally adopts the ton-degree price evaluation method, and the calculation formula is ton-degree price = Jn / 100F (Jn is the burden price, and F is the iron grade). The acidic burden generally has a high SiO2 content, and since the influence of the SiO2 content on the cost performance of the burden is not considered, the ton-degree price evaluation method has certain errors, and when the cost performance of two or more kinds of acidic burdens with close ton-degree prices is evaluated and compared, the method may be distorted.

[0003] The blast furnace burden structure is quite different, and the typical blast furnace burden structure in China is 70% basic sinter + 20% acidic pellet + 10% acidic lump ore, the basicity of the sinter is about 2.0, which is close to the median value of the reasonable basicity interval (1.8-2.2). When the blast furnace burden structure is the typical burden structure, the basicity of the sinter has a certain adjustment range, the SiO2 in the acidic burden is a useless component, and CaO needs to be added in the sintering to balance the basicity, therefore, under the typical burden structure, the SiO2 in the acidic burden has a negative influence on the cost performance of the acidic burden.

[0004] Because the sintering process capacity is relatively large, the use proportion of the blast furnace sinter is more than 75%, the basicity of the sinter is at the lower limit of the reasonable interval, and the blast furnace is forced to use acidic flux (silica) or high-silicon iron ore to balance the basicity of the slag, in this case, the SiO2 in the acidic burden is a useful component, therefore, under the burden structure with a high sintering proportion, the SiO2 in the acidic burden has a positive influence on the cost performance of the acidic burden. The influence of the SiO2 on the cost performance of the acidic burden is positive and negative under different burden structures, and it is not accurate to evaluate the cost performance of the acidic burden by using the ton-degree price evaluation method. SUMMARY

[0005] The present application aims to overcome the above-mentioned deficiencies, and provides a SiO2 acidic burden cost performance evaluation method, which is more accurate in evaluating the cost performance of the acidic burden.

[0006] To achieve the above-mentioned purpose, the present application provides a SiO2 acidic burden cost performance evaluation method, and the evaluation method is as follows: comparing the actual binary basicity of the sinter with the lower limit of the binary basicity of the sinter, if the actual binary basicity of the sinter is greater than or equal to A, it is determined that the influence of the SiO2 on the cost performance of the acidic burden is negative, otherwise, it is positive, A = the lower limit of the binary basicity of the sinter + error.

[0007] If positive, the ton price of the acid burden is calculated by formula (1); if negative, the ton price of the acid burden is calculated by formula (2);

[0008] Ton price = [Jn - Jsi x (SiO2 - CaO ÷ R2)] ÷ (100 x F) (1)

[0009] Ton price = [Jn + Jca x (SiO2 x R2 - CaO)] ÷ (100 x F) (2)

[0010] Wherein:

[0011] Jn - unit price of the acid burden

[0012] Jsi - price of silica

[0013] Jca - price of CaO added in sinter

[0014] F - grade of the acid burden

[0015] R2 - binary basicity of slag

[0016] SiO2 - SiO2 content of the acid burden

[0017] CaO - CaO content of the acid burden

[0018] The ton price is low, and the cost performance is high.

[0019] Further, the error is 0.3-0.7.

[0020] Further, the error is 0.5.

[0021] Compared with the prior art, the present application has the beneficial effects: according to the burden structure of the blast furnace and the basicity of the sinter, the positive and negative effects of SiO2 on the cost performance of the acid burden are determined, the effects of SiO2 on the cost performance of the acid burden are converted into the burden price, different calculation formulas are used to calculate the cost performance of the acid burden according to the positive and negative effects, the deficiencies of the present ton price evaluation method are made up, and more effective guidance is provided for purchasing the acid burden (for blast furnace) with higher cost performance; for the steel plants with different burden structures in different regions, the present application can be used to guide the use of the acid burden in which region the cost performance is higher. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below with reference to specific examples, so as to be understood by those skilled in the art.

[0023] Examples

[0024] A steel enterprise has two iron-making areas A and B. The sintering ore R2 of area A is 2.05, and the sintering ore R2 of area B is 1.85, which reaches the lower limit of the sintering ore alkalinity control of the factory. In order to balance the slag alkalinity, the blast furnace needs to use about 15 kg / t of silica. There are four kinds of acid furnace charges on the market for the factory to choose from, and part of the components and market prices are shown in Table 1.

[0025] Table 1 Part of the components and market prices of several acid furnace charges

[0026] Acid charge Price, yuan / t Tfe, % SiO2, % CaO, % Acid charge 1 956 59.34 10.35 0.37 Acid charge 2 1060 63.25 3.45 0.05 Acid charge 3 785 54.34 17.56 0.68 Acid charge 4 695 47.90 25.78 0.43

[0027] The ton-degree price of several acid furnace charges calculated by the present application and the existing calculation method is shown in Table 2.

[0028] Table 2 Ton-degree price of several acid furnace charges

[0029]

[0030] According to Table 2, the performance-price ratio ranking of several acid furnace charges can be obtained, which is shown in Table 3.

[0031] Table 3 Performance-price ratio ranking of several acid furnace charges

[0032] Acid charge A area cost performance ranking B area cost performance ranking General cost performance ranking Acid charge 1 3 3 3 Acid charge 2 4 2 4 Acid charge 3 2 1 1 Acid charge 4 1 4 2

[0033] Using the conventional evaluation method, the performance-price ratio ranking of several acid furnace charges is: acid furnace charge 3> acid furnace charge 4> acid furnace charge 1> acid furnace charge 2.

[0034] Using the evaluation method of the present application, the performance-price ratio ranking of several acid furnace charges in area A is: acid furnace charge 4> acid furnace charge 3> acid furnace charge 1> acid furnace charge 2; and the performance-price ratio ranking of several acid furnace charges in area B is: acid furnace charge 3> acid furnace charge 2> acid furnace charge 1> acid furnace charge 4.

[0035] Using the evaluation method of the present application, the performance-price ratio ranking of several acid furnace charges in areas A and B is compared, and it is found that acid furnace charge 4 has the most performance-price ratio in area A and the least performance-price ratio in area B, so it is recommended to use acid furnace charge 4 in area A. Similarly, it is recommended to use acid furnace charge 2 in area B.

Claims

1. A method for evaluating the cost performance of an acidic charge material for SiO2, characterized by: The evaluation method steps are: comparing the actual binary basicity of sinter with the lower limit of the binary basicity of sinter, if the actual binary basicity of sinter is greater than or equal to A, the influence of SiO2 on the cost performance of acid burden is negative, otherwise it is positive, A = the lower limit of the binary basicity of sinter + error; If it is positive, the ton-degree price of acid burden is calculated by formula (1); If it is negative, the ton-degree price of acid burden is calculated by formula (2); Ton-degree price = [Jn - Jsi x (SiO2 - CaO ÷ R2)] ÷ (100 x F) (1) Ton-degree price = [Jn + Jca x (SiO2 x R2 - CaO)] ÷ (100 x F) (2) Wherein: Jn---unit price of acid burden Jsi---price of silica Jca---price of CaO added in sinter F---grade of acid burden R2---binary basicity of slag SiO2---SiO2 content of acid burden CaO---CaO content of acid burden The ton-degree price is low, and the cost performance is high.

2. The SiO2 acidic charge cost performance evaluation method according to claim 1, characterized in that: The error is 0.3-0.

7.

3. The SiO2 acidic charge cost performance evaluation method according to claim 1, characterized in that: The error is 0.5.

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