Abstract
To ensure a low content of sulfur in steel, desulphurization of it in steel ladles is used. To form liquid-movable high-basicity slags with high refining properties, boron oxide is often used instead of fluorspar, the effect of which on the resistance of the refractory lining of steel ladles has not been sufficiently studied and requires detailed theoretical and experimental studies. Results of experimental studies of the influence of the basicity and content of boron oxide in the slags of the CaO-SiO 2 -B 2 O 3 -Al 2 O 3 system on periclase-carbon refractories solubility presented. The studies were carried out using the simplex-lattice planning method. The results of mathematical modeling are presented in the form of a composition-property diagram (solubility of periclase-carbon refractories). Analysis of the experimental data shown in the diagram provided new information about the influence of basicity and boron oxide content in the slags of the CaO-SiO 2 -B 2 O 3 system containing 15% Al2O3 on the solubility of periclase-carbon refractories. It was found that slags formed in the basicity region 2-3, containing 4-6% B 2 O 3 , affect quite aggressively the periclase-carbon refractories. The degree of wear of the refractory sample varies within limits from 20 to 40%. A decrease in the content of B 2 O 3 in the slag down to 1-4% with the same basicity is accompanied by a decrease of the wear degree of the periclase-carbon refractory down to 30% max. Slags of basicity 3-4 at 1-4% B 2 O 3 are characterized by a relatively low aggressive slag effect on the periclase-carbon refractory. The wear degree of periclase-carbon refractory is reduced to 8-12% and practically does not reach 15%. The displacement of slags basicity to the area of increased basicity up to 5 does not lead to a significant reduction in the aggressive impact of slag on the refractory. The degree of wear of the refractory sample varies within 6-10% at the content of 1-4%B 2 O 3 and increases to 12% at 4-6 % B 2 O 3 .
Highlights
Одним из важных факторов повышения качества металла является внепечное рафинирование жидкой стали
The studies were carried out using the simplex-lattice planning method
The results of mathematical modeling are presented in the form of a composition-property diagram
Summary
Исследование влияния оксида бора и основности шлаков системы CaO–SiO2–B2O3–Al2O3 на растворимость периклазоуглеродистых огнеупоров выполнено с использованием симплексрешетчатого метода планирования эксперимента, позволяющего построить математические модели, описывающие зависимость изучаемого свойства от состава в виде непрерывной функции [10, 11]. При построении матрицы планирования эксперимента на переменные составляющие исследуемой оксидной системы наложены ограничения: CaO/SiO2 = 2–5; B2O3 = 0–6 %; Al2O3= 15 % Исследованная область шлаков изучаемой оксидной системы предс-тавлена в виде локального симплекса двумя концентрационными треугольниками. CaO–SiO2–B2O3, вершинами которого являются псевдокомпоненты Y1, Y2, Y3 и Y1, Y3, Y4 1) изучаемого симплекса, выплавляли в графитовых тиглях из предварительно прокаленных в течение 2–3 ч при температуре 800 °С (В2О3 при температуре 105 °С) оксидов марки ч.д.а. После расплавления шлак перемешивали в течение 30 мин с целью гомогенизации расплава [12]. Экспериментальные составы шлаков, соответствующие остальным точкам плана локального симплекса, получали встречной шихтовкой шлаков вершин симплекса [12,13,14,15,16]
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