White olivine ladle draining sand and method for preparing the same

Abstract

The invention relates to a forsterite ladle drainage sand and a preparation method thereof. The technical scheme adopted is: first mix 86-96wt% forsterite sand, 1-6wt% flake graphite, 1-8wt% potassium feldspar powder, and 0.5-2wt% carbonaceous micropowder, and then 5~15kg bags are packed in separate bags to prevent material segregation. Among them: MgO content of forsterite sand ≥ 41.0wt%, particle size 0.3 ~ 2.5mm, C content of flake graphite ≥ 95.0wt%, particle size 0 ~ 0.15mm, K2O content of potassium feldspar powder ≥ 10.0wt% , The particle size is 0-0.045mm, the C content of the carbonaceous micropowder is ≥85.0wt%, and the particle size is 0-0.020mm. The invention uses forsterite sand as the base material, and the prepared product has the characteristics of good high temperature resistance, high self-opening rate, low price, no adverse effect on human body, no segregation and convenient use.

Description

technical field [0001] The invention belongs to the field of refractory materials with forsterite sand as the base material. In particular, it relates to a forsterite-based ladle drainage sand and a preparation method thereof. Background technique [0002] With the rapid development and wide application of continuous casting technology in the steelmaking industry, the ladle uses a sliding nozzle to install drainage sand to replace the original ceramic stopper rod. When the sliding nozzle is opened, the molten steel in the ladle can pass through the upper The nozzle, the upper slide steel hole, the lower slide steel hole, and the lower nozzle flow out by themselves, and flow into the continuous casting tundish through the long nozzle for continuous casting. The function of the drainage sand is: when the steel is filled, the upper surface of the drainage sand filled in the ladle nozzle produces a thinner sintered layer under the heat of the high-temperature molten steel, form...

AI Technical Summary

Problems solved by technology

In order to improve the performance of drainage sand, some manufacturers use refined quartz sand as the main raw material (CN1165798). However, processing refined quartz sand will increase production costs, and at the same time, the siliceous dust produced by processing quartz sand will seriously affect the health of workers.

The drainage sand produced by chrome concentrate is beneficial to improve the pouring rate (CN1524648), but the price of chrome concentrate is expensive, the cost is too high, and chromium oxide will volatilize hexavalent chromium at high temperature, which is harmful to human body

Forsterite sand is low in price and good in high temperature resistance, and is an ideal raw material for preparing drainage sand, but there are few manufacturers applying it at present. Two companies have adopted forsterite sand to participate in the batching production of drainage sand (CN1267652, CN1509827), However, the particle size of forsterite sand is too large, which affects the self-opening rate, and more fused magnesia and chrome concentrate sand are added, which increases the cost