Method for manufacturing high-grade chromite-based stuffing sand for ladle

Abstract

The invention discloses a method for manufacturing high-grade chromite-based stuffing sand for a ladle. The method comprises a pre-mixing step, in which graphite is poured into a sodium carboxymethylcellulose solution and is subjected to pre-mixing for 10-20 min, and carbon black is added and is subjected to mixing for 10-20 min to obtain a pre-mixed material. The method further comprises a step-by-step mixing step, in which sea sand, quartz sand, and high-alumina balls are added into an agitator and are subjected to mixing for 5-10 min; then chrome ore is added and is subjected to mixing for 8-15 min; then chrome green is added and is subjected to mixing for 5-10 min; and the pre-mixed material is added and is subjected to stirring for 10-20 min to obtain a mixed material. The method further comprises a rotary drying step, in which the mixed stuffing sand obtained through the above steps is sent into a rotary drying cylinder and is subjected to baking at 200-230 DEG C for 15-30 min in order to obtain the dried high-grade chromite-based stuffing sand for a ladle. The stuffing sand obtained through the method has characteristics of uniform mixing and mobility and a low water content. An automatic free-opening rate can be effectively increased.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a drainage sand, in particular to a preparation method of a ladle high-grade chromium drainage sand. Background technique [0002] With the introduction of high-end manufacturing, it is required that the composition of molten steel in the ladle is uniform, and the materials in contact with molten steel do not react with molten steel and have high performance stability. Therefore, higher requirements are put forward for the drainage sand in contact with molten steel in the ladle. At present, there are many domestic manufacturers of drainage sand, but there are very few precision crafts designed for drainage sand. [0003] At present, the drainage sand provided by domestic drainage sand manufacturers generally adopts the process of mixing + packaging or mixing + drying + packaging. The main raw materials for drainage sand production are mostly chrome ore, sea sand or quartz sand, carbon bl...

AI Technical Summary

Problems solved by technology

Therefore, the use of mixing + packaging drainage sand production process is likely to cause excessive moisture in the drainage sand, uneven mixing, etc., resulting in the reaction of the drainage sand and molten steel, resulting in the ladle not being able to automatically start pouring

The mixing + drying drainage sand process can effectively prevent the moisture from exceeding the standard, but it cannot solve the problem of raw material mixing uniformity

[0004] In this case, during the production of drainage sand, there is no specially designed preparation method to ensure that the drainage sand is mixed evenly and dry, which leads to problems such as low automatic pouring rate of the ladle for the same formula, which brings huge losses to the enterprise. Economic losses