The pollution of refractory materials in the cement industry is mainly caused by chromium-containing refractories. The main ways are as follows: First, in the calcination process of cement clinker, when chromium-containing refractories are in the presence of oxidizing atmosphere and alkaline oxides, Cr+3 Some of it will be converted into Cr+6, which is harmful to humans, and will be mixed into the cement clinker along with the peeled refractory materials, causing the chromium content in the cement to exceed the standard; second, the chromium-containing waste bricks are treated unreasonably, and they are washed into the ground by rainwater. And pollution to the groundwater source.

Since the 1990s, my country’s cement industry has developed rapidly. Chromium-containing refractories have been widely used in the firing zone of cement kilns and have achieved good results. At the same time, chromium pollution caused by chromium-containing refractories has been achieved. More extensive. In order to solve the environmental pollution problem caused by magnesia-chrome bricks used in cement kilns, chromium-free has become a top priority. After the unremitting efforts of the majority of refractory workers, chromium-free alkaline refractories have been developed by leaps and bounds in the past 20 years. The developed chromium-free refractories for the firing zone of cement kilns mainly include periclase-spinel bricks, magnesia-iron spinel bricks, and magnesia-iron-aluminum composite spinel bricks.

The magnesium-iron-aluminum composite spinel brick developed by Zhengzhou Ruitai Refractory Technology Co., Ltd. is another energy-saving and environmentally-friendly new refractory material developed on the basis of the original magnesium-iron spinel brick.