A kind of preparation method of granular chrome drainage sand

Abstract

The invention provides a preparation method for granular chromite-based stuffing sand, and relates to the technical field of metallurgical refractory materials. The preparation method comprises the following steps of selecting granular high temperature resistant materials as core materials; mixing chromite sand fine powder or mixtures of chromite sand fine powder and river sand fine powder with high-temperature binders uniformly, and forming coating materials; placing the core materials into a disk granulating machine for rolling granulation, adding the coating materials, and drying and solidifying particles after rolling granulation; adding carbonaceous materials to the particles obtained after drying and solidification, and mixing the carbonaceous materials with the particles uniformly;and spraying atomized water in the mixing process, and finally drying the mixtures, so that the granular chromite-based stuffing sand is obtained. The granular chromite-based stuffing sand with composite coating is prepared with the preparation method provided by the invention, not only can the composition segregation problem generated after different grain compositions be solved, but also excessive sintering among the particles can be avoided; molten steel permeation can be prevented; and accordingly the problems that the composition segregation is easy to generate by conventional stuffing sand, the particles are not rounded enough, and do not facilitate flow, and the price is high are solved.

Description

technical field [0001] The invention relates to the technical field of metallurgical refractory materials, in particular to a preparation method of granular chromium drainage sand. Background technique [0002] Drainage sand is the key material that determines whether the ladle can be poured automatically, and has an important impact on the quality of molten steel. If the pouring cannot be started automatically, oxygen burning and drainage are required, which will cause secondary oxidation of part of the molten steel, affect the quality of molten steel, and increase the cost of pouring steel. At the same time, the oxygen burning and drainage process will also threaten the safety of equipment and operators. Chromium drainage sand is widely used because of its high refractoriness and high self-opening rate of ladle. Chromium drainage sand (such as CN105541358A) is usually made of chrome ore sand particles and river sand particles through particle grading in a certain proporti...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the technical problem to be solved by the present invention is to provide a preparation process of granular chromium drainage sand, which uses cheap and high-melting granular refractory material as the core material, and a layer of chrome ore fine powder or chromium ore powder is coated on the surface. The mixture of ore fine powder and river sand fine powder prepares granular chromium drainage sand with composite coating, which can not only avoid the problem of component segregation caused by different particle grading, but also prevent excessive sintering between particles, and It can prevent the infiltration of molten steel, thereby solving the problem that the traditional drainage sand is prone to component segregation, the particles are not round enough to flow, and the price is expensive.