本文選題：形核劑 + 顆粒密度�。� 參考：《華北理工大學》2017年碩士論文

【摘要】：鋼鐵企業(yè)的生產過程中排出了大量高爐渣,其熱值高,且多用來生產低附加值產品,造成了浪費資源、污染環(huán)境等嚴重問題,因此提高高爐渣的利用率是解決環(huán)保問題,促進鋼鐵企業(yè)發(fā)展循環(huán)經濟的必要措施之一。由于高爐渣的主要成分與微晶玻璃成分相似,因此是制備微晶玻璃的理想廢棄物。微晶玻璃是基礎玻璃經過可控的晶化作用而形成的一種晶體相和玻璃相共存的多晶材料,玻璃的形核過程主要依靠非均勻形核,晶化過程需要一定的析晶活化能,形核劑的加入不但可以誘導非均勻形核,還能夠降低所需析晶活化能,因此是熔融態(tài)高爐渣制備微晶玻璃的過程中必不可少的添加劑。形核劑在熔體中的擴散過程屬于顆粒的自由擴散,為保證形核劑在不同粘度的熔體中分散均勻,有必要利用Fluent軟件模擬不同密度、等效直徑的形核劑顆粒在不同粘度熔體中的擴散過程,確定形核劑的混勻時間。通過數(shù)值模擬和物理模擬得出的結論如下:(1)顆粒的沉降時間與溶液的動力粘度成反比,顆粒的等效直徑成正比。溶液的動力粘度越小,顆粒的等效直徑越大時,沉降所需的時間越短,最終懸浮于溶液中的顆粒濃度越低。(2)形核劑的混勻時間與形核劑的密度、等效直徑成正比,與熔體的粘度成反比。對于等效直徑為100μm的Ti O2、Ca F2和P2O5顆粒在熔體溫度為1385℃時的混勻時間分別為818s、1187s和1518s。
[Abstract]:In the production process of iron and steel enterprises, a large amount of blast furnace slag is discharged, and its calorific value is high, and it is mostly used to produce low value-added products, which results in serious problems such as wasting resources and polluting the environment. Therefore, to improve the utilization ratio of blast furnace slag is to solve the problem of environmental protection. One of the necessary measures to promote the development of circular economy in iron and steel enterprises. Because the main composition of blast furnace slag is similar to that of glass-ceramics, it is an ideal waste for preparing glass-ceramics. Glass-ceramics is a kind of polycrystalline material formed by the controllable crystallization of the basic glass. The nucleation process of the glass mainly depends on the heterogeneous nucleation, and the crystallization process requires a certain crystallization activation energy. The addition of nucleating agent can not only induce heterogeneous nucleation, but also reduce the required crystallization activation energy, so it is an essential additive in the preparation of glass-ceramics from molten blast furnace slag. The diffusion process of nucleating agent in melt belongs to the free diffusion of particles. In order to ensure the uniformity of nucleating agent in melt with different viscosity, it is necessary to simulate different density by fluent software. The diffusion process of nucleating agent particles with equivalent diameter in different viscosity melts and the homogenization time of nucleating agents were determined. The results obtained by numerical and physical simulation are as follows: (1) the settling time of the particles is inversely proportional to the dynamic viscosity of the solution, and the equivalent diameter of the particles is in direct proportion. The smaller the dynamic viscosity of the solution is, the larger the equivalent diameter of the particles is, the shorter the settling time is, and the lower the particle concentration in the solution is, the lower the mixing time of the nucleating agent is, and the equivalent diameter is proportional to the density of the nucleating agent. It is inversely proportional to the viscosity of the melt. When the melt temperature is 1385 鈩，

本文編號：2019686