The "Cascade Utilization Demonstration for Solid Waste Resource Recovery in the Calcium Carbide Industry" developed by Ordos Shuangxin Chemical Industry Co has been selected as a national "Zero-Waste Enterprise" demonstration case – the only entry from the Inner Mongolia autonomous region this time.

The Ministry of Industry and Information Technology recently released its list of demonstration cases for "Zero-Waste Parks" and "Zero-Waste Enterprises", marking a milestone for Otog Banner's "Zero-Waste City" initiative, industrial solid waste resource utilization, and green industrial transformation.

Ordos Shuangxin Chemical Industry Co is selected as a national "Zero-Waste Enterprise" demonstration case. [Photo provided to investordos.goinnermongolia.com.cn]

Ordos Shuangxin Chemical Industry Co has built on its "calcium carbide-polyvinyl alcohol" circular industrial chain and, through technological upgrades, coordinated the treatment of general industrial solid waste and hazardous waste to create a cascade-utilization demonstration for solid waste.

First, the company has mastered solid waste modification technologies to achieve large-scale resource utilization. It collects and stores solid waste such as calcium carbide slag, dust removal ash, and fly ash, and processes it into high-value-added products such as cement clinker and desulfurizing agents through pressure filtration and dewatering, ultrafine crushing, and composite activation. In 2025, it used calcium carbide slag to replace natural limestone, consuming approximately 1 million metric tons of calcium carbide slag, with solid waste accounting for over 80 percent of the cement raw meal blend.

Second, it has upgraded its cement rotary kiln system to safely dispose of hazardous waste. Through kiln modifications and the installation of hazardous-waste pretreatment facilities, high-temperature decomposition furnaces, and high-efficiency combustion devices, it has achieved harmless disposal of various hazardous wastes, including acetic acid residue, sludge, spent activated carbon, and waste mineral oil.

Third, the company has independently developed a purification ash incineration device to create a closed-loop utilization system. By integrating enclosed conveyance, circulating fluidized bed incineration, and waste heat recovery, the calcium carbide purification dust removal ash is incinerated to produce steam. The resulting bottom ash and the fly ash are then activated for use in power plant desulfurization, achieving cascade recycling of waste residues.