Present situation and suggestion of comprehensive utilization of metallurgical slag in China

(3) blast furnace slag. Weifang Special Steel Group has an annual output of 120,000 t of slag wool production line.

4, the comprehensive utilization of metallurgical slag problems

As steel slag is the most difficult metallurgical slag to use, the comprehensive utilization rate is less than 40%, this paper only takes steel slag as an example to analyze the problems existing in the comprehensive utilization industry.

(1) The use of single, comprehensive use of product standards lack. The comprehensive utilization of steel slag is mainly based on concrete admixture and road base material, and there are some problems such as single product channel and thin industrial chain. Due to low technical barriers, lack of technical specifications and standards, unstable quality, it is difficult to compete with natural products, under the same conditions, construction units still prefer natural building materials, product market acceptance is low.

(2) The level of comprehensive utilization technology needs to be improved. Steel slag has poor stability because it contains free calcium oxide and magnesium oxide. At present, the main technical ways to solve the stability problem of major iron and steel enterprises are hot stew, hot pour and other processes, but can not completely eliminate the free calcium oxide, free magnesium oxide problem. Preparation of steel slag powder from steel slag is the most important way to utilize steel slag. Due to the low level of technical equipment, lack of technical research and development capabilities and other problems, difficult grinding is still a common problem facing the industry, limiting its use in cement. Large-scale use of concrete.

(3) The development of comprehensive utilization industry lacks unified layout and regulation. The comprehensive utilization of steel slag lacks unified planning and layout, and scientific research and development, technology introduction and capital investment fail to form a scientific and reasonable operation mode. Among comprehensive utilization enterprises, large enterprises occupy the advantage or monopoly resources have cost advantages, while small enterprises are at a disadvantage in the market due to small scale, high cost and low product quality.

5. Suggestions for comprehensive utilization of metallurgical slag

China's steel industry accounts for about 15% of the country's total carbon emissions, making it the largest carbon emitting industry. The efficient utilization of iron and steel solid waste resources can reduce the consumption of primary resources, which is one of the important ways for China's iron and steel industry to implement the target task of carbon peak and carbon neutrality. In view of the existing problems of steel solid waste, the following suggestions are put forward.

(1) Establish a sound standard system to improve the market acceptance of comprehensive utilization products. Strengthen the publicity of relevant standards for the comprehensive utilization of solid waste, regularly hold relevant training, and improve the standardization awareness of industry practitioners. We will improve the formulation and amendment of relevant standards and norms for the comprehensive utilization of solid waste products and the whole process of utilization, and incorporate the goal of achieving green and low-carbon resource utilization of the comprehensive utilization of solid waste industry into the goal of ecological civilization construction for evaluation and assessment.

(2) Strengthen technology research and development to improve the comprehensive utilization level of steel slag. Strengthen the cooperation between "production, study, research and use", and actively develop advanced technology and equipment, especially in the implementation of the "carbon peak, carbon neutral" strategic deployment, improve the comprehensive utilization of metallurgical slag product categories, improve the research and development of green and low-carbon comprehensive utilization technology, reduce the secondary pollution in the comprehensive utilization process, and achieve the preparation of diversified green building materials products from metallurgical slag to fill the market gap.

(3) To carry out low-carbon development planning for the comprehensive utilization of metallurgical slag industry. Major iron and steel enterprises should pay attention to the formulation of low-carbon development plans for the comprehensive utilization of solid waste such as metallurgical slag industry, strengthen the overall planning of comprehensive utilization of solid waste, rationally layout the industrial chain, increase the investment in technology and equipment research and development, energy saving and environmental protection process facilities, and encourage existing metallurgical industrial parks and industrial parks to develop action plans to improve the comprehensive utilization of metallurgical slag. Further improve the comprehensive utilization level of metallurgical slag.