石英砂捣打料高温变化   石英砂在573°产生晶体转变，发生体积膨胀， 577°，硼矸与石英砂形成玻璃相，表面釉化 。 870°，石英砂开始第二次晶体转变，体积，膨胀量持续放大。 1470°，石英砂晶体转变完成，体积增大5% 。 石英砂捣打料在这整个烧结和热传导过程中，形成烧结层，半烧结层和松散层。半烧结层从870度逐渐向烧结层过度。 于此同时，在高温下，石英砂体积明显变化，高温气孔率增加，体积稳定性变差，导致整体出现明显开裂，烧失后，产生明显收缩，剥落等。影响整体炉龄。   High temperature change of quartz ramming mass material Quartz sand produces crystal transition at 573°, occurs volume expansion, 577°, boron gangue forms a glass phase with quartz sand, surface glaze. 870°, quartz sand begins the second crystal transition, volume, expansion amount continues to enlarge. At 1470°, the quartz sand crystal transformation was completed, and the volume was increased by 5%. During the whole sintering and heat conduction process, the sintering layer, semi-sintering layer and loose layer are formed. The semi-sintering layer gradually excessive from 870 degrees to the sintering layer. At the same time, under high temperature, the volume of quartz sand changes significantly, the high temperature stomatal rate increases, the volume stability deterior, resulting in obvious overall cracking, burning loss, obvious shrinkage, peeling and so on. Affect the overall furnace age.  

无硼捣含硼捣打料对比实验说明 含硼捣打料主要包括以硼酸（H3BO3）和硼干(B2O3)为主要结合剂的石英硅质捣打料，硼酸在加热时分解以B2O3形式存在于沙料中，在温度1000-1300度时，B2O3和硅砂中的SIO等形成低熔点物质sio2.B2O3，从而降低了硅砂的熔点，改善烧结条件，提高了捣打料的烧结强度。加之热传导效率以及传导厚度等因素，在中频炉升温过和使用过程中，使捣打料层有效分为烧结层，半烧结层和松散层。 同时在高温（1600度）以及中温（1100度）对试样耐压强度的分析与对比，如图： Comparison experiment description of boron-free and boron-containing  ramming mass for induction furnace  Boron-containing tamping material mainly includes quartz silica tamping with boronic acid (H3BO3) and boron dry (B2O3) as the main binding agent, boric acid decomposition in B2O3 form of sand material during heating, at the temperature of 1000-1300 degrees, B2O3 and SIO in silica sand form low melting point material sio2.B2O3, thus reducing the melting point of silicon sand, improve sintering conditions, improve the sintering strength of tamping material. In addition, with the heat conduction efficiency and conduction thickness and other factors, the tamping layer is effectively divided into sintering layer, sintering layer, semi-sintering layer and loose layer. At the same time, the analysis and comparison of the sample compressive strength at high temperature (1,600 degrees) and medium temperature (1,100 degrees), as shown in the figure: 与无硼结合剂实验结果对比如下表：   有硼捣打料 无硼捣打料 项目 B2O3& (H3BO3) 原使用材料 优化实验指标 抗折强度 11 4.6 7.2 7.6 9.7 耐压强度 15.6 15.04 22.71 22.43 19.78 备注说明： 抗折强度是指材料单位面积承受弯矩时的极限折断应力。又称抗弯强度、断裂模量。通常指耐火泥料或陶瓷材料受到弯曲负荷的作用而破坏时的极限应力。 耐压强度：火材料在一定温度下，单位面积上所能承受的极限载荷。耐压强度是衡量耐火材料质量的重要性能指标之一，间接地反应出制品的组织结构，如致密性、均匀性、烧结性等。   根据对比实验结果以及数据，含硼捣打料在抗折强度以及晶体重建，抗体积膨胀等方面确实优于无硼捣打料。无硼捣打料在烧结强度特别是高温烧结强度大幅优于含硼捣打料。如配合好半烧结层以及松散层，有利于大幅提升使用寿命。 Note: Resistance strength refers to the ultimate breaking stress when the material per unit area bears the bending moment. Also known as flexural strength, fracture modulus. Usually refers to the limit stress when the...

Research description of boron-free ramming mass materials for induction furnace  The main failure forms of furnace lining mainly include the following: 1. Thermal stress cracking, furnace lining in the use process of use, the lining contacts high temperature metal liquid, the outer layer is close to the water cooling coil, the temperature difference is huge, after the periodic cold and heat cycle, cause volume expansion and contraction, easy to lead to the furnace lining thermal stress cracking, expansion and peeling phenomenon. 2. Chemical erosion, C and FeO in steel water form a chemical reaction with the furnace lining at high temperature, SIO2 + 2C —> SI + 2CO, SIO2 is reduced by C; FEO and SIO2 to FEO.SIO2 low melt at about 1170 degrees, quickly separated from the furnace lining under the stirring of high temperature steel water. 3, Electromagnetic mixing and local overheating caused by mechanical erosion, furnace lining is in the process of steel water contact, local may appear a series of chemical and physical reaction, cause local overheating, form local liquid phase, in electromagnetic stirring, and steel water erosion process, easy to form furnace lining defect, cracking, in cracking and defect is prone to appear furnace lining...

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HENAN HONGDA design the refractory layer of DC EAF type of Enrichment of platinum project is running successful . this project is chinese first DC EAF Enrichment of platinum project . this DC EAF working temp : 2000 'C , melt liquid temp : 1750'C

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