Alkaline refining slag is used in the slag adjustment method of producing slag cotton

Abstract

The invention relates to the technical field of metallurgical waste slag reuse, in particular to a slag adjustment method for producing high-quality slag wool with alkaline refining slag. It is characterized in that: for the alkaline refining slag produced in the process of steelmaking or ferroalloy refining, aluminum ash slag containing aluminum, spodumene and boron anhydride are used as slag adjusting agents in sequence to reduce the alkalinity and oxidation of refining slag and improve Fiber-forming properties of slag.

Description

technical field [0001] The invention relates to the technical field of metallurgical waste slag reuse, in particular to a slag adjustment method for producing high-quality slag cotton by using alkaline refining slag. Background technique [0002] Slag cotton is made of metallurgical waste slag as the main raw material. After adjusting the composition, the high-temperature slag is made into silk-like inorganic fibers by high-pressure gas injection or centrifugal spinning method. This inorganic fiber is a good heat insulation, Insulation and refractory materials, and can be further processed into refractory heat insulation boards, heat insulation walls and other green and environmentally friendly materials for construction and thermal equipment; at present, slag cotton can be remelted from solid slag to make cotton, or it can be produced at a suitable temperature and composition. Under normal circumstances, it is directly released from the smelting furnace and used for cotton ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the use of metallurgical slag to make cotton is basically aimed at the smelting slag of ironmaking and ferroalloy. The common characteristics of this smelting slag are high acidity and high alumina content in the slag, that is, CaO-SiO 2 -Al 2 o 3 Acidic smelting slag based on the ternary system; for example, application number 200910143417.2 discloses a method for producing slag wool from high-temperature liquid ferroalloy waste slag; for example, application number 201010211387.7 discloses equipment and methods for producing slag wool by utilizing ironmaking slag; but, Due to the long smelting cycle of ferroalloy and iron-making process, the cycle of slag discharge is also long, it is difficult to achieve matching and coordination with the subsequent direct cotton production, while the refining of steelmaking and ferroalloy has short cycle, fast slag discharge and high slag temperature, which is beneficial It is conducive to direct cotton production and realizes coordination with the cotton production process. However, at present, no technical method for cotton production for alkaline refining slag has been retrieved in the prior art. This is because the current ferroalloy refining and steel refining are both Strong alkaline and often oxidizing refining slag is produced. Highly alkaline and highly oxidizing slag is not easy to form filaments when blown, and it is easy to pulverize after cooling. It lacks glass slag to form filaments and maintain fibrous shape at low temperature. Therefore, the highly alkaline refining slag needs a special slag adjustment treatment method in order to overcome the current bottleneck problem of direct cotton production from alkaline refining slag