Production of high value-added imitation marble using metallurgical waste

Our metallurgical waste emissions by up to 80 million tons per year, how comprehensive utilization of resources for these wastes have been various iron and steel enterprises to achieve sustainable development an important issue. However, as far as the current research in China is concerned, except for blast furnace slag, which is widely used in the production of cement, most of it has not been effectively utilized. Even if it is used as a cheap cement raw material, the development value is not high; steelmaking slag is theoretically It can be used as a cement clinker, but it has not been fully utilized. In recent years, many steel companies at home and abroad have actively developed the use of water-quenched slag to develop decorative materials and high-value-added products such as glass-ceramics, but the manufacturing process must be carried out in the process of drying and grinding in the process of metallurgical slag treatment. A large amount of energy is consumed, and a large amount of residual heat carried by the high-temperature liquid slag is also wasted. Due to the slow progress in the comprehensive utilization of metallurgical wastes, some steel companies have accumulated slag in the slag yards, which not only encroach on land resources, but also seriously pollute the environment and restrict the development of steel enterprises. Therefore, it is obviously of great significance to study how to make full use of the energy carried by high-temperature liquid slag to produce high value-added products.

Steel slag, such as steelmaking water quenching slag, ironmaking water quenching slag, etc., are products of high temperature liquid slag produced from steelmaking converters and ironmaking blast furnaces discharged into water. Nangang's high-temperature liquid slag discharged from iron and steel smelting is not quenched by water, and directly heat-treated after adding appropriate admixture, and the imitation marble is successfully obtained. Since the liquid slag of 1350～1450°C is used as the main raw material, all the residual heat carried by the liquid slag is fully utilized, and thus the energy saving effect is obvious. The performance indexes of the obtained imitation marble are even better than the standards of the building materials department, and the color is beautiful, durable, and the added value is greatly improved.

Nangang uses the blast furnace slag, converter slag and electric furnace slag discharged from the company to add appropriate amount of waste glass, auxiliary agent, crystallization agent and color reagent under high temperature liquid state. After the composition is homogenized, it is poured into the square mold by large bismuth and In the vertical mold, it is annealed at 610 to 730 ° C for 1.5 to 2.5 hours, and then subjected to deep processing to obtain imitation marble. The test results of the obtained material samples show that the performance indexes of the samples are close to or better than natural marble and granite ; compared with natural marble, the color is uniform and the gloss is constant; the natural granite does not appear after rain. The color is different in depth, and the phenomenon of caustic soda is mild. Moreover, this kind of marble is non-polluting, non-radioactive, and does not cause harm to the human body. It is a green decorative material.

From the perspective of economic benefits, imitation marble production costs are low and profits are high. According to the annual calculation of 800,000 tons of steel slag from Nangang, 20 million square meters of imitation marble can be produced; according to the current market price, the profitable tax is nearly 300 million yuan; and the energy saving is 400 million kWh. Equally important, this not only makes full use of blast furnace slag and steel slag, but also solves the environmental pollution problem caused by steel slag.

According to reports, Baosteel also produces imitation marble with 70% steel slag usage according to the physical and chemical properties of different steel slags. Compared with natural artificial marble, Baosteel has good wear resistance, high hardness, high temperature resistance and extremely low radioactive content. Etc.

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