Method for producing converter coolant by Bayer red mud

Abstract

The invention discloses a method for producing converter coolant by Bayer red mud, and relates to the field of converter steelmaking. The method comprises steps of preparing Bayer red mud by using 30-40% of Fe2O3, 25-30% of SiO, 10-20% of Al2O3, 1-7% of CaO, 5-10% of Na2O and 2-5% of TiO in percentage by weight; carrying out wet magnetic separation on the Bayer red mud, to obtain 45-75% of Fe2O3, 5-15% of SiO2, 6-16% of Al2O3, 0.2-5% of CaO, 3-10% of Na2O and 1-3% of TiO2; filter-pressing the red mud after the magnetic separation to obtain 5-8% of water, adding 4-6% of water glass and 0.5-1% of sodium fluosilicate, mixing and shaping in a ball press machine, and drying until water content is 2-4%, thus obtaining the converter coolant. The converter coolant prepared by the method is high in cooling efficiency, free from smelting time occupation, convenient to regulate temperature, low in production cost, uniform in granularity, good in ball press effect, high in strength and small in dust; the converter coolant protects environment and saves resource.

Description

technical field [0001] The invention relates to the field of converter steelmaking, in particular to a method for producing converter coolant from Bayer process red mud. Background technique [0002] Oxygen top-blown converters generally use pure oxygen blowing, which will generate a large amount of excess heat during the steelmaking process, so a certain amount of coolant needs to be added to accurately control the end point temperature within the range of tapping temperature. At present, steel scrap, iron ore or pellets (also known as sinter) are generally used as coolants. However, scrap steel is not only expensive, but also requires special feeding equipment, otherwise it will increase the feeding time and it is inconvenient to adjust during the blowing process. temperature; iron ore is easily brought into the gangue, increasing lime consumption and slag volume; pellets have a high oxygen content, and are easy to float on the liquid surface after being added, and may cau...

AI Technical Summary

Problems solved by technology

Alumina plants in various parts of my country generally use the method of building platforms on flat ground to stockpile red mud. Because no protective measures are taken, free alkali and other harmful components in red mud pollute the groundwater source at a depth of 200-700 meters, making the water source permanently alkalized; at the same time , a large number of red mud stockpiles occupy land, produce a large amount of dust pollution, and seriously damage the ecological environment