Industrial hazardous solid waste refers to industrial solid waste that can cause actual or potential harm to human health or the environment. Can be divided into toxic, flammable, corrosive, can spread diseases, have a strong chemical reaction. The types of industrial hazardous solid waste include: non-ferrous metal slag, fly ash, carbide slag, chromium slag and chemical waste residue. Among them, chromium slag refers to industrial waste residue produced in the process of producing metal chromium and chromium salt. If chromium slag is piled up in the open air, the hexavalent chromium ions oozing out are highly toxic, which will pollute the environment and endanger the health of people and livestock. Therefore, the storage of chromium slag requires laying the ground to prevent leakage and setting the shed cover. Chromium slag is often treated at high temperature to eliminate its toxicity.