Method for measuring and calculating quality of industrial silicon smelting product

Abstract

The application discloses a kind of industrial silicon smelting product quality measurement model, it includes the following steps: (1) the raw material of production industrial silicon includes silica raw material, carbonaceous reducing agent and loose agent;(2) according to the content M of raw material compound in step (1) into the ore-heating furnace is respectively theoretically calculated n ;(3) according to the content of each raw material compound in step (2) is respectively theoretically calculated the content C of Fe, Al, Ca, P, Ti and B each impurity element in industrial silicon product.Beneficial effect: the measurement model disclosed in the application has high accuracy, can accurately guide industrial silicon production batching according to the requirements of customers on product quality, and then the demand quantity of raw materials and the corresponding procurement plan are formulated, while ensuring product quality, the demand quantity of various raw materials and the corresponding procurement plan can be optimized according to market price, and then production cost is optimized.

Description

Technical Field

[0001] This invention patent belongs to the field of industrial silicon production technology, specifically relating to a method for calculating the quality of industrial silicon smelting products. Background Technology

[0002] Industrial silicon is a product smelted from silicon ore and carbonaceous reducing agents in a submerged arc furnace. Its main component, silicon, contains over 99% silicon, with the remaining impurities being iron, aluminum, calcium, phosphorus, titanium, boron, etc. Industrial silicon production involves using silicon ore as raw material and carbon materials as reducing agents in a submerged arc furnace to obtain industrial silicon products. These products mainly include organosilicon, polycrystalline silicon, and metallurgical silicon.

[0003] Patent application number 202311250090.5 discloses a method for guiding the batching of industrial silicon production. Specifically, it discloses a method for forward calculation of the theoretical chemical composition of the industrial silicon product based on the chemical composition and proportions of the raw materials, as well as the empirical consumption values ​​of each raw material. The method also calculates the actual consumption values. Then, it compares the theoretical chemical composition of the industrial silicon product with the chemical composition of the actually produced industrial silicon product, thereby guiding adjustments to the raw material composition and proportions for industrial silicon production. Using the adjusted raw material composition and proportions and the actual consumption values, the method again forward calculates the theoretical chemical composition of the industrial silicon product and calculates the actual consumption values. Finally, it compares the theoretical chemical composition of the industrial silicon product with the chemical composition of the actually produced industrial silicon product, thereby guiding adjustments to the raw material composition and proportions for industrial silicon production, forming a closed loop. This method improves the cost-effectiveness of industrial silicon products, significantly increases silicon recovery rates, and is beneficial for the long-term stable operation of the submerged arc furnace.

[0004] However, the above guidance method has the following problems: 1. Industrial silicon smelted in an electric arc furnace needs to be refined to remove impurities before casting and cooling to obtain the product. The chemical composition of the industrial silicon product in the above guidance method does not take into account the influence of refining and impurity removal, so the calculated results are inaccurate and cannot accurately guide the batching of industrial silicon production; 2. In the process of smelting in an electric arc furnace, refining in a silicon ladle, and casting in molds to form the product, the iron materials of the electric arc furnace hood, furnace nozzle, silicon ladle nozzle, etc. are very easy to melt into the silicon water. Therefore, the above guidance method only considers the iron impurities in the raw materials, resulting in inaccurate calculation results and thus failing to accurately guide the batching of industrial silicon production; 3. The above guidance method only calculates the impurities of iron, calcium, and aluminum, and does not consider the impact of the content of impurities such as phosphorus, titanium, and boron in the raw materials on the product, nor does it consider the impact of the explosion resistance of various types of silica and the fixed carbon of various carbon materials on the product.

[0005] Therefore, there is an urgent need to develop a calculation model that can accurately guide the smelting and production of industrial silicon products. Summary of the Invention

[0006] Therefore, the present application aims to provide a method for measuring and calculating the quality of industrial silicon smelting products, and the measuring and calculating model provided by the present application has high accuracy, can accurately guide the production of industrial silicon according to the requirements of customers for product quality, and can further formulate the demand quantity of raw materials and the corresponding procurement plan, so as to optimize the demand quantity of various raw materials and the corresponding procurement plan according to market prices while ensuring product quality, and further optimize production costs.

[0007] The technical scheme of the present application discloses a method for measuring and calculating the quality of industrial silicon smelting products, which comprises the following steps:

[0008] (1) The raw materials for producing industrial silicon include silica raw materials, carbonaceous reducing agents and loose agents, wherein the silica raw materials include at least one silica, the carbonaceous reducing agents include at least one carbon material, and the loose agents include at least one loose material;

[0009] (2) The content of the raw material compounds entering the ore smelting furnace is theoretically calculated according to the raw materials in step (1) :

[0010]

[0011] Wherein n is Fe2O3, Al2O3, CaO, P2O5, TiO2 and B2O3, respectively; is the percentage content of the corresponding compound in each silica, %; is the percentage content of the corresponding compound in each carbon material, %; is the percentage content of the corresponding compound in each loose material, %; is the mass of the silica raw materials, kg; is the mass of the i-th silica, kg; is the mass of the carbonaceous reducing agent, kg; is the mass of the i-th carbon material, kg; is the mass of the loose agent, kg; is the mass of the i-th loose material, kg; is the consumption coefficient of the silica raw materials; is the consumption coefficient of the carbonaceous reducing agent; is the consumption coefficient of the loose agent;

[0012] (3) The content C of each impurity element Fe, Al, Ca, P, Ti and B in the industrial silicon product is theoretically calculated according to the content of each raw material compound in step (2)

[0013]

[0014] Wherein, is the content of the raw compound Fe2O3 in step (2), %; is the correction coefficient of Fe element; is the content of the iron dissolved in the silicon water in the equipment during smelting, %;

[0015]

[0016] wherein, is the content of the raw compound Al2O3 in step (2), %; is the correction coefficient of Al element; is the efficiency of removing Al in refining;

[0017]

[0018] wherein, is the content of the raw compound CaO in step (2), %; is the correction coefficient of Ca element; is the efficiency of removing Ca in refining;

[0019]

[0020] wherein, is the content of the raw compound P2O5 in step (2), %; is the correction coefficient of P element; is the efficiency of removing P in refining;

[0021]

[0022] wherein, is the content of the raw compound TiO2 in step (2), %; is the correction coefficient of Ti element; is the efficiency of removing Ti in refining;

[0023]

[0024] wherein, is the content of the raw compound B2O3 in step (2), %; is the correction coefficient of B element; is the efficiency of removing B in refining.

[0025] Further, in step (2), is 2.2-3.3; is 1.6-2.4; is 0.5-1.05.

[0026] Further, in step (3), is 1; 1.2-1.65, 70%-90%; 1.5-2.5, 75%-97%; 0.205-0.305, 65.0%-80.5%; 0.9-1, 10.5%-25.5%; 0.65-0.85, 5%-25%.

[0027] Further, in step (1), the anti-explosion of the silica raw material R is calculated by the following formula:

[0028]

[0029] wherein, is the anti-explosion of each silica, %; the anti-explosion R of the silica raw material is 80%-97%.

[0030] Further, in step (1), the fixed carbon FC of the raw material is calculated by the following formula:

[0031]

[0032] wherein, is the fixed carbon of each carbon material, %; is the fixed carbon of each loose material, %; the mass ratio between the fixed carbon FC and the silica is 0.41-0.43:1.

[0033] Further, the application further comprises the following step: according to the content of each raw material compound in step (2), the content of Al element entering the electric furnace is theoretically calculated , %:

[0034]

[0035] wherein, is 0.15%-0.4%.

[0036] Further, in step (1), the mass ratio of the silica raw material, the carbonaceous reducing agent and the loose agent is 1:0.65-0.7:0.175-0.225.

[0037] Advantages of the application:

[0038] 1. The application discloses a method for measuring and calculating the quality of industrial silicon smelting products, considers the influencing factors of impurity removal and the equipment iron material of smelting process, has high measurement accuracy, can accurately guide industrial silicon production batching according to the requirements of customers on product quality, and further formulates the demand quantity of raw materials and corresponding procurement plan.

[0039] 2. The application discloses a method for measuring and calculating the quality of industrial silicon smelting products, fully considers the measurement of the contents of six main impurities, i.e., iron, aluminum, calcium, phosphorus, titanium and boron in industrial silicon, and the influences of the blast resistance of various silicas and the fixed carbon of various carbon materials on products, more accurately guides industrial silicon production batching, adjusts the proportions of various silicas, and further obtains the blast resistance (80%-97%) of the most suitable smelting silica, which is helpful to improving the yield and the silicon recovery rate, adjusts the proportions of various carbon materials and various loose materials, and further realizes the adjustment of the fixed carbon required by the electric arc furnace, ensures that the furnace maintains balanced fixed carbon, and is helpful to the three-phase balance of the electrode and the stability of the furnace condition.

[0040] 3. The application discloses a method for measuring and calculating the quality of industrial silicon smelting products, limits the range of Al content in the electric arc furnace, ensures that the raw materials in the furnace have sufficient fluidity, avoids affecting the yield and the quality of industrial silicon, and is convenient for better guiding industrial silicon production batching.

[0041] 4. The application discloses a method for measuring and calculating the quality of industrial silicon smelting products, can optimize the demand quantity of various raw materials and corresponding procurement plan according to market prices while ensuring product quality, and further optimizes production cost. DETAILED DESCRIPTION

[0042] The application will be further described in detail through the embodiments.

[0043] Embodiment 1: A method for measuring and calculating the quality of industrial silicon smelting products, comprising the following steps:

[0044] (1) The raw materials for producing industrial silicon include silica raw materials, carbonaceous reducing agents and loose agents, wherein the silica raw materials include at least one silica, the carbonaceous reducing agents include at least one carbon material, and the loose agents include corn cobs and wood chips; the mass ratio of the silica raw materials, the carbonaceous reducing agents and the loose agents is 1:0.65-0.7:0.175-0.225.

[0045] (2) The content of the raw material compounds entering the electric arc furnace is theoretically calculated according to the raw materials in step (1). :

[0046]

[0047] n is Fe2O3, Al2O3, CaO, P2O5, TiO2 and B2O3, respectively; is the percentage content of each corresponding compound in the silica, %; is the percentage content of each corresponding compound in the carbon material, %; is the percentage content of each corresponding compound in the loose material, %; is the mass of the silica raw material, kg; is the mass of the i-th silica, kg; is the mass of the carbonaceous reducing agent, kg; is the mass of the i-th carbon material, kg; is the mass of the loose agent, kg; is the mass of the i-th loose material, kg; is the consumption coefficient of the silica raw material; is the consumption coefficient of the carbonaceous reducing agent; is the consumption coefficient of the loose agent; is 2.2-3.3; is 1.6-2.4; is 0.5-1.05.

[0048] (3) The content C of each impurity element Fe, Al, Ca, P, Ti and B in the industrial silicon product is theoretically calculated according to the content of each raw material compound in step (2), %:

[0049]

[0050] wherein, is the content of the raw material compound Fe2O3 in step (2), %; is the correction coefficient of Fe element; is the content of the iron dissolved in the silicon water in the equipment during smelting, %;

[0051]

[0052] wherein, is the content of the raw material compound Al2O3 in step (2), %; is the correction coefficient of Al element; is the efficiency of removing Al in refining;

[0053]

[0054] wherein, is the content of the raw material compound CaO in step (2), %; is the correction coefficient of Ca element; is the efficiency of removing Ca in refining; is the content of the raw material compound CaO in step (2), %;

[0055]

[0056] wherein, is the content of the raw material compound P2O5 in step (2), %; is the P element correction coefficient; is the refining removal efficiency of P;

[0057]

[0058] wherein, is the content of the raw material compound TiO2 in step (2), %; is the Ti element correction coefficient; is the refining removal efficiency of Ti;

[0059]

[0060] wherein, is the content of the raw material compound B2O3 in step (2), %; is the B element correction coefficient; is the refining removal efficiency of B.

[0061] wherein, is 1; is 1.2-1.65, is 70%-90%; is 1.5-2.5, is 75%-97%; is 0.205-0.305, is 65.0%-80.5%; is 0.9-1, is 10.5%-25.5%; is 0.65-0.85, is 5%-25%.

[0062] In step (1), the blast resistance R of the silica raw material is calculated according to the formula:

[0063]

[0064] wherein, is the blast resistance of each silica, %, and the blast resistance R of the silica raw material is 80%-97%; the blast resistance of each silica is detected according to YB / T 5268-2014 to obtain the blast resistance of each silica.

[0065] In step (1), the fixed carbon FC of the raw material is calculated according to the formula:

[0066]

[0067] wherein, is the fixed carbon corresponding to each carbon material; is the fixed carbon corresponding to each loose material; the mass ratio between the fixed carbon FC and the silica is 0.41-0.43:1, and the fixed carbon of each carbon material and each loose material is detected according to GB / T 212-2008.

[0068] According to the content of each raw material compound in step (2), the content of Al element entering the submerged arc furnace is theoretically calculated ,

[0069]

[0070] wherein, is 0.15%-0.4%.

[0071] A factory producing industrial silicon received an order for industrial silicon products from a customer, and the specific product parameter requirements are shown in Table 1.

[0072] Table 1 Product parameter requirements of a customer

[0073]

[0074] According to the above requirements, the method disclosed in Example 1 is used for batching, and the prepared material is added to the submerged arc furnace for smelting, and then impurities are removed after refining, and then the product is obtained after casting and cooling. The composition of the product obtained by smelting each furnace is detected, and the results are shown in Table 2.

[0075] Table 2 Test results of industrial silicon

[0076]

[0077] As can be seen from Table 2, the composition of the ten batches of industrial silicon produced meets the product parameter requirements of the customer. Through the calculation model disclosed in the present application, precise guidance of industrial silicon production batching can be achieved according to the customer's requirements for product quality, and the demand for raw materials and the corresponding procurement plan can be formulated, thereby realizing the regulation and control of cost and the optimization of furnace conditions.

[0078] The above is the preferred embodiment of the present application. For those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered within the scope of protection of the present application.

Claims

1. A method for measuring the quality of an industrial silicon smelting product, characterized in that, It comprises the following steps: (1) The raw materials for producing industrial silicon include silica raw materials, carbonaceous reducing agents and bulking agents, wherein the silica raw materials include at least one silica, the carbonaceous reducing agents include at least one carbon material, and the bulking agents include at least one bulking material; (2) The contents of the raw material compounds entering the submerged arc furnace are theoretically calculated according to the raw materials in step (1) : n is Fe2O3, Al2O3, CaO, P2O5, TiO2 and B2O3, respectively; is the percentage content of the corresponding compound in each silica, %; is the percentage content of the corresponding compound in each carbon material, %; is the percentage content of the corresponding compound in each loose material, %; is the mass of the silica raw material, kg; is the mass of the i-th silica, kg; is the mass of the carbonaceous reducing agent, kg; is the mass of the i-th carbon material, kg; is the mass of the loose agent, kg; is the mass of the i-th loose material, kg; is the consumption coefficient of the silica raw material; is the consumption coefficient of the carbonaceous reducing agent; is the consumption coefficient of the loose agent; (3) The content C of each impurity element Fe, Al, Ca, P, Ti and B in the industrial silicon product is theoretically calculated according to the content of each raw material compound in step (2); wherein, is the content of the raw material compound Fe203 in step (2), %; is the correction coefficient of Fe element, is 1; is the content of iron in the equipment melted in the silicon water in the smelting process, %; wherein, is the content of the raw material compound Al203 in step (2), %; is the correction coefficient of Al element, is 1.2-1.65; is the efficiency of refining removal of Al, is 70%-90%; wherein, is the content of the raw compound CaO in step (2), %; is the correction coefficient of Ca element, is 1.5-2.5; is the efficiency of refining removal of Ca, is 75%-97%. wherein, is the content of the raw material compound P2O5 in step (2), %; is the P element correction coefficient, is 0.205-0.305; is the efficiency of refining and removing P, is 65.0%-80.5%; wherein, is the content of the raw material compound TiO2 in step (2), %; is the Ti element correction coefficient, is 0.9-1; is the efficiency of refining removal of Ti, is 10.5%-25.5%; wherein, is the content of the raw material compound B2O3 in step (2), %; is the correction coefficient of B element, is 0.65-0.85; is the efficiency of refining removal of B, is 5%-25%.

2. The method for measuring and calculating the quality of an industrial silicon smelting product according to claim 1, characterized in that, In step (2), is 2.2-3.3; is 1.6-2.4; is 0.5-1.

05.

3. The method for measuring and calculating the quality of an industrial silicon smelting product according to claim 1, characterized in that, In step (1), the anti-explosion property R of the silica raw materials is calculated by the following formula: wherein, R is the shock resistance of the silica raw material, which is 80-97%.

4. The method for measuring and calculating the quality of an industrial silicon smelting product according to claim 1, characterized in that, In step (1), the fixed carbon FC of the raw materials is calculated by the following formula: wherein, is the fixed carbon corresponding to each carbon material, is the fixed carbon corresponding to each loose material; the mass ratio between the fixed carbon FC and the silica is 0.41-0.43:

1.

5. The method for measuring and calculating the quality of an industrial silicon smelting product according to claim 1, characterized in that, It further comprises the following steps: The content of Al element in the electric arc furnace is theoretically calculated according to the content of each raw material compound in step (2) , %: wherein is 0.15-0.4%.

6. The method for measuring and calculating the quality of an industrial silicon smelting product according to claim 1, characterized in that, In step (1), the mass ratio of the silica raw materials, the carbonaceous reducing agents and the bulking agents is 1:0.65-0.7:0.175-0.225.

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