A kind of slagging agent for iron and steel refining and preparation method thereof
A technology of slagging agent and iron and steel, applied in the field of slagging agent, can solve the problems of increasing the production cost of vanadium aluminum alloy, low active ingredient of calcium oxide, insufficient activity, etc., and achieve the goal of improving smelting level, increasing porosity, and increasing air permeability Effect
Active Publication Date: 2022-04-29
ZHEJIANG CHENGYU ENVIRONMENTAL PROTECTION NEW MATERIAL CO LTD
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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
Method used
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Embodiment 1
[0034] 1. A preparation method of a novel slag-forming agent for steel refining, comprising the following preparation steps:
[0035] 1) Preparation of calcium carbonate
[0036] First dissolve ammonium bicarbonate with deionized water, then add calcium sulfate, the molar ratio of ammonium bicarbonate and calcium sulfate is 1.5:1, add ammonia water, the reaction temperature is 55 ℃, and the reaction speed is 500r / min, after the reaction for 3h, the reaction The product is subjected to suction filtration, washing, and solid-liquid separation, and the obtained solid-phase product is dried to obtain calcium carbonate;
[0037] 2) Preparation of CaO:
[0038] After calcining the product of step 1), CaO particles with a purity of 99.7% are obtained, and the particles are crushed and sieved, and the particle size D50 is 14 mm;
[0039] 3) Preparation of porous CaO-Al2O3
[0040] The calcium carbonate (CC) and alumina (AO) obtained in step 1) are in a molar ratio of 1:2, and 3wt% ...
Embodiment 2-3
[0044] Implementation 2-3 was carried out according to the parameters in Table 1, and the rest were the same as in Example 1.
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Abstract
The invention relates to a new type of slagging agent for iron and steel refining and its preparation method. First, calcium carbonate is prepared by using ammonium bicarbonate and calcium sulfate, a by-product of salt lake water, and then calcined to obtain CaO particles with a purity of more than 99.7%. The molar ratio of calcium carbonate and alumina is 1:1-6 to prepare porous CaO-Al2O3. During the preparation process, the pore-enhancing agent ammonium bicarbonate is added, and large porous CaO-Al2O3 composites are obtained by crushing, and then coated with alumina sol Cover macroporous CaO-Al2O3, mix large-diameter porous material with high-purity calcium oxide particles in a weight ratio of 1:7.5-11 to obtain the slagging agent of the present invention. The invention overcomes the defects of the narrow particle size range of the slagging agent in the prior art, too small and too large, and realizes the improvement of desulfurization efficiency under the larger particle size.
Description
technical field [0001] The invention relates to a slag-forming agent in iron and steel smelting process. Background technique [0002] Slag-forming agents play an important role in iron and steel smelting. Commonly used slag-forming agents include calcium oxide, limestone, fluorite, fire bricks, etc. However, in recent years, many new slag-forming agents have emerged, one of which is related to waste utilization. For example, Chinese invention patent CN2019113090653 discloses a converter steelmaking slag-making agent and a preparation method thereof in order to realize the comprehensive utilization of waste dry materials in a tundish in a steelmaking plant and avoid waste of resources, and provide a converter steel-making slag-making agent, It comprises: 10-20 parts of tundish waste dry materials, 30-35 parts of steel-making dust, 40-50 parts of quartz sand and 5-10 parts of binder. The wastes that are difficult to be comprehensively utilized, such as steel-making dust remo...
Claims
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IPC IPC(8): C21C7/076C21C5/36
CPCC21C7/076C21C5/36Y02P10/20
Inventor 楼晓刚丁盛刘红军
Owner ZHEJIANG CHENGYU ENVIRONMENTAL PROTECTION NEW MATERIAL CO LTD