Abstract: As the main solid discharge in the coal chemical industry, the treatment method of gasification slag directly determines the sustainable development prospects of the coal chemical industry. How to efficiently separate unburned carbon and silicate phase components from gasification slag is the focus of research on the comprehensive utilization of gasification slag. This paper uses a combined separation process of spiral chute and table concentrator to study the carbon extraction behavior of gasification slag. Hancock efficiency and fixed carbon recovery rate are used to evaluate the separation effect, and XRD, SEM methods are used to analyze the properties of carbon rich products. The research results show that the preliminary selection effect of the spiral chute is significant, with the fixed carbon content of the concentrate increasing from 23.1% to 67.5%, and the fixed carbon content of the tailings decreasing to 1.6%. The secondary separation effect of ore and tailings in the spiral chute is good, the unburned carbon and silicate phase in the gasification slag are further separated. The secondary separation effect of spiral chute concentrate is poor. The final combined separation production could obtain two types of products: carbon rich and ash rich. The yield of carbon rich products is 29.2%, the fixed carbon content is greater than 60%, and the calorific value is 5 000 kcal. The loss on ignition of rich ash products is less than 5%, meeting the first-class fly ash standard. The XRD results indicate that the main inorganic components in the carbon rich product are quartz and calcite. The SEM results indicate that there is a small amount of separable silicate phase in the porous unburned carbon matrix, indicating the possibility of secondary refinement. The gasification slag combined separation process not only achieves unburned carbon upgrading, but also provides a basic condition for the subsequent preparation of high-quality building materials based on gasification slag.