Plastic refractory for repairing furnace lining of medium-frequency induction furnace and preparation method of plastic refractory

Abstract

The invention relates to a plastic refractory for repairing a furnace lining of a medium-frequency induction furnace and a preparation method of the plastic refractory. According to the technical scheme, 63.0 wt%-78.0 wt% of vanadium iron slag, 12.0 wt%-17.0 wt% of basalt, 8.0 wt%-13.0 wt% of bauxite and 2.0 wt%-7.0 wt% of bentonite serve as raw materials, a binding agent accounting for 4.0 wt%-5.5 wt% of the raw materials is added, the raw materials are mixed to be uniform, and the plastic refractory for repairing the furnace lining of the medium-frequency induction furnace is obtained. The vanadium iron slag comprises the following main chemical components: more than or equal to 83.5 wt% of Al2O3, more than or equal to 9.0 wt% of MgO, less than or equal to 5.0 wt% of CaO, less than or equal to 0.3 wt% of SiO2, less than or equal to 0.2 wt% of Fe2O3 and less than or equal to 0.2 wt% of IL. Therefore, the method has the characteristics of environmental friendliness, simple process and low production cost; and the prepared plastic refractory for repairing the furnace lining of the medium-frequency induction furnace is convenient in construction mode, high in bonding strength, excellent in slag resistance and long in service life.

Description

technical field [0001] The invention belongs to the technical field of plastics for furnace lining repair. In particular, it relates to a plastic material for repairing the lining of an intermediate frequency induction furnace and a preparation method thereof. Background technique [0002] The medium frequency induction furnace is a power supply device that converts the power frequency 50Hz alternating current into intermediate frequency (300-2000Hz) direct current. Firstly, the three-phase power frequency alternating current is rectified and turned into direct current, and then the direct current is turned into an adjustable intermediate frequency current to supply the induction coil, a strong magnetic field is generated in the energized coil, and the charge body is heated by the principle of electromagnetic induction. The inner side of the intermediate frequency induction furnace lining material is filled with high-temperature molten metal, and the outer periphery is a wa...

AI Technical Summary

Problems solved by technology

[0005] At present, there is a plastic preparation technology for repairing the lining of the intermediate frequency induction furnace: such as the patented technology of "a plastic for repairing the lining of the intermediate frequency furnace and its preparation method" (CN106278204A). Chromium, bauxite and plasticizer are used as raw materials and mixed uniformly to obtain plastics for repairing the lining of intermediate frequency furnaces. However, due to the introduction of chromium oxide and alumina at the same time in this technology, chromium oxide easily reacts with alumina to generate highly toxic Cr. 6+ , which is not conducive to environmental protection and safety; and because the raw materials are all non-renewable natural resources, the cost is relatively high; for example, the literature "Preparation and Performance Research of Phosphate-based High-alumina Refractory Plastics" (Jiang Yanwei, Master Thesis of Jiangnan University, 2018) published A method for preparing refractory plastics by combining phosphoric acid or phosphate with alumina and zirconia, to obtain high-alumina refractory plastics, the use of phosphoric acid and phosphates in this process limits the application in the field of high-temperature alloy smelting, and the chemistry of plastics Poor stability and low refractoriness; another example is the patented technology of "aluminosilicate refractory plastic" (CN111704470A), which uses corundum, mullite, bauxite, glass fiber, aluminum silicate, plasticizer , defoamer and refractory additives are used as raw materials, and mixed evenly to obtain aluminosilicate refractory plastics. Due to the introduction of glass fiber and aluminum silicate at the same time, this technology is very easy to form a low melting phase, resulting in a decrease in the slag resistance of the plastics