Novel slagging agent for steel refining and preparation method of novel slagging agent

Abstract

The invention relates to a novel slagging agent for steel refining and a preparation method of the novel slagging agent. Firstly, ammonium bicarbonate and salt lake water by-product calcium sulfate are used for preparing calcium carbonate; next, after calcination, CaO particles with the purity being 99.7% or above are obtained, the prepared calcium carbonate and aluminum oxide are used for preparing porous CaO-Al2O3 according to the molar ratio 1: (1-6), a hole adding agent ammonium bicarbonate is added in the preparation process, and massive porous CaO-Al2O3 compound is obtained through breaking; and then the macropore CaO-Al2O3 is coated with aluminum oxide sol, and the massive porous material and high-purity calcium oxide particles are mixed according to the weight proportion of 1: (7.5-11). According to the novel slagging agent for steel refining and the preparation method of the novel slagging agent, the defect that a slagging agent in the prior art is narrow in particle size range is overcome, too small and too large are defective, and improvement of desulphurization efficiency is achieved under large particle sizes.

Description

technical field [0001] The invention relates to a slagging agent in iron and steel smelting technology. Background technique [0002] Slagging agents play an important role in iron and steel smelting. Commonly used slagging agents include calcium oxide, limestone, fluorite, fire bricks, etc. However, many new slagging agents have emerged in recent years, one of which involves waste utilization. For example, Chinese invention patent CN2019113090653 discloses a converter steelmaking slagging agent and its preparation method. It includes: 10-20 parts of tundish waste dry material, 30-35 parts of steelmaking dust, 40-50 parts of quartz sand and 5-10 parts of binder. Wastes that are difficult to comprehensively utilize, such as steelmaking dust and tundish waste and dry materials in iron and steel plants, are used as important components of the product to realize internal recycling of waste resources, and magnesium oxide is added to reduce the erosion of the furnace lining by th...

AI Technical Summary

Problems solved by technology

At present, the slagging agents are all analytically pure fluorspar or quicklime. The price of such reagent-grade products is expensive. The price of fluorite can reach more than 30,000 yuan / ton, which greatly increases the production cost of vanadium-aluminum alloys. It has been directly or indirectly recorded in various iron and steel smelting practices or textbooks, and further recorded in documents such as patent technology, such as Chinese patent CN104328278A

[0009] A further and more obvious production reality is that the active ingredients of the composite slagging agent calcium oxide in the prior art are relatively low, and the particle size requirements for calcium oxide or other slagging agents are relatively strict. If the particle size is too low, it will cause splashing, and if it is too high, it will cause activity. Not enough, slow response

Images