镁铬砖，炉外精炼的内衬材料 Magnesia-chrome bricks, lining material for ladle refining.

在钢铁、有色金属冶炼等高温工业场景中，耐火材料是保障生产连续运转的核心支撑，而镁铬砖凭借其优异的综合性能，长期占据着关键岗位，成为炉外精炼等严苛工况下的优选材料。
作为一种碱性耐火制品，镁铬砖的成分构成具有明确的核心配比。其主要成分为氧化镁（MgO）和三氧化二铬（Cr₂O₃），其中氧化镁含量占比55%~80%，三氧化二铬含量为8%~20%，微观结构以方镁石、尖晶石为主要矿物组分，辅以少量硅酸盐相形成完整结构。根据原料纯度、制备工艺及用途差异，镁铬砖可分为硅酸盐结合、直接结合、再结合、半再结合等多个品类，不同品类在成分细节上略有调整，以适配不同工况需求，例如直接结合镁铬砖的二氧化硅杂质含量低于2%，性能更优。

In high-temperature industrial settings such as steel and non-ferrous metal smelting, refractory materials are the core support for ensuring continuous production. Magnesia-chrome bricks, with their excellent comprehensive performance, have long occupied a key position and become the preferred material for harsh conditions such as ladle refining.

As an alkaline refractory product, magnesia-chrome bricks have a clearly defined core composition. Their main components are magnesium oxide (MgO) and chromium trioxide (Cr₂O₃), with magnesium oxide accounting for 55%–80% and chromium trioxide accounting for 8%–20%. The microstructure is mainly composed of periclase and spinel, supplemented by a small amount of silicate phases to form a complete structure. Based on differences in raw material purity, preparation process, and application, magnesia-chrome bricks can be divided into several categories, including silicate-bonded, directly bonded, rebonded, and semi-rebonded. Different categories have slight adjustments in composition details to adapt to different operating conditions. For example, directly bonded magnesia-chrome bricks have a silica impurity content of less than 2%, resulting in superior performance.

独特的成分构成赋予了镁铬砖多重核心优势。其一，耐火性能出众，荷重软化温度普遍可达1600℃以上，部分高端品类更是超过1700℃，能从容应对高温熔融环境；其二，抗侵蚀与稳定性强，对酸碱范围较宽的炉渣均有良好抵抗力，尤其能抵御碱性渣和高温液体的冲刷，同时具备优异的抗热震性，可适应剧烈的温度波动；其三，结构强度可靠，经高温烧制后形成稳固的固相键合，在高温环境下仍能保持结构完整性，不易剥落损毁。此外，通过浸盐处理等工艺优化，还可进一步降低气孔率、提升体积密度和耐压强度。

The unique composition of magnesia-chrome bricks endows them with multiple core advantages. Firstly, they exhibit outstanding refractory performance, with a load softening temperature generally exceeding 1600℃, and some high-end varieties even surpassing 1700℃, easily handling high-temperature melting environments. Secondly, they possess strong erosion resistance and stability, exhibiting good resistance to slags with a wide acid-base range, especially resisting the erosion of alkaline slags and high-temperature liquids, while also possessing excellent thermal shock resistance, adapting to drastic temperature fluctuations. Thirdly, they have reliable structural strength, forming a stable solid-phase bond after high-temperature firing, maintaining structural integrity even under high-temperature environments, and are not easily peeled off or damaged. Furthermore, through process optimization such as salt impregnation, porosity can be further reduced, and bulk density and compressive strength can be increased.

铬刚玉砖 Chromium corundum brick

在工业生产中，镁铬砖的应用场景高度集中于高温、高压、强腐蚀的关键部位。在钢铁冶炼领域，它是RH、DH真空脱气装置及VOD、AOD精炼炉等炉外精炼设备的核心内衬材料，广泛用于工作衬、渣线区、风眼区等易损部位，保障钢水净化与精炼过程的稳定；在有色金属冶炼中，适配闪速炉、转炉、阳极炉等设备，抵御多金属冶炼中的复杂侵蚀；同时，它还可应用于水泥回转窑烧成带、玻璃窑蓄热室等高温场景。

In industrial production, the application of magnesia-chrome bricks is highly concentrated in critical areas involving high temperature, high pressure, and strong corrosion. In the steel smelting industry, it is the core lining material for ladle refining equipment such as RH and DH vacuum degassing devices and VOD and AOD refining furnaces, and is widely used in vulnerable parts such as working linings, slag line areas, and tuyere areas to ensure the stability of the steel purification and refining process. In non-ferrous metal smelting, it is compatible with equipment such as flash furnaces, converters, and anode furnaces to resist the complex corrosion in multi-metal smelting. At the same time, it can also be applied in high-temperature scenarios such as cement rotary kiln firing zones and glass kiln regenerators.

随着工业绿色化、高效化发展，镁铬砖也在不断迭代升级。低铬配方、再生原料利用等技术的突破，既保留了其核心性能，又降低了环境影响，使其在兼顾生产效率与环保合规的需求中，持续发挥着不可替代的作用。

With the greening and efficiency-oriented development of industry, magnesia-chrome bricks are also constantly being upgraded. Breakthroughs in technologies such as low-chromium formulations and the utilization of recycled raw materials have not only preserved their core performance but also reduced their environmental impact, enabling them to continue to play an irreplaceable role in balancing production efficiency and environmental compliance.