阅读说明：本技术 一种转炉大面热态修补料及其制备方法 (converter large-surface hot-state repair material and preparation method thereof ) 是由 刘星 徐勇 沈钢 顾华志 黄奥 于 2019-11-22 设计创作，主要内容包括：本发明涉及一种转炉大面热态修补料及其制备方法,所述制备方法具体包括以下步骤：S1：制备预混料：先将35wt％的镁橄榄石、3～5wt％的金属铬、10～20wt％的氧化钙、2～10wt％的氧化锂、5～15wt％的氧化铝与5～8wt％的新戊二醇在120℃～150℃条件下混合搅拌均匀,冷却后得到预混料；S2：制备修补料：将S1中制备得到的预混料与5～40wt％镁橄榄石、5～10wt％的镁砂及0.1～0.5wt％的聚羧酸增塑剂混合,搅拌均匀,制得转炉大面用热态修补料。本发明提出的一种转炉大面热态修补料及其制备方法,所制备的修补料具有高温自流性好、粘附性好、烧结时间短、强度高、耐炉渣侵蚀、寿命长、低导热和环境友好的特点。(The invention relates to large-area hot repair materials for a converter and a preparation method thereof, wherein the preparation method comprises the following steps of S1 preparing a premix, namely mixing and stirring uniformly 35 wt% of forsterite, 3-5 wt% of metal chromium, 10-20 wt% of calcium oxide, 2-10 wt% of lithium oxide, 5-15 wt% of aluminum oxide and 5-8 wt% of neopentyl glycol at 120-150 ℃, cooling to obtain the premix, S2 preparing the repair material, namely mixing and stirring uniformly the premix prepared in S1 with 5-40 wt% of forsterite, 5-10 wt% of magnesia and 0.1-0.5 wt% of polycarboxylic acid plasticizer to obtain the large-area hot repair material for the converter.)

The preparation method of the large-surface hot patching material for the converters is characterized by comprising the following steps:

s1: preparing a premix: firstly, mixing and stirring uniformly 35 wt% of forsterite, 3-5 wt% of metal chromium, 10-20 wt% of calcium oxide, 2-10 wt% of lithium oxide, 5-15 wt% of aluminum oxide and 5-8 wt% of neopentyl glycol at 120-150 ℃, and cooling to obtain a premix;

s2: preparing a repairing material: and (3) mixing the premix prepared in the step (S1) with 5-40 wt% of forsterite, 5-10 wt% of magnesite and 0.1-0.5 wt% of polycarboxylic acid plasticizer, and uniformly stirring to prepare the hot repairing material for the large face of the converter.

2. The method for preparing hot patching materials on the large face of a converter according to claim 1, wherein the forsterite in steps S1 and S2 mainly comprises the following raw materials by weight percentage>40wt％，SiO₂Content (wt.)<40wt％，Fe₂O₃Content (wt.)<10wt％。

3. The preparation method of kinds of converter large-area hot patching materials, according to claim 1, characterized in that the CaO content in the calcium oxide is more than 98.5 wt%, and the particle size is 1-0.15 mm.

4. The method for preparing the converter large-area hot patching material as claimed in claim 1, wherein Al in the alumina is₂O₃The content is more than or equal to 99.5wt percent, and the grain diameter is less than or equal to 45 mu m.

5. The method for preparing the converter large-area hot patching material as claimed in claim 1, wherein Li in the lithium oxide₂The content of O is more than or equal to 99.5wt percent, and the grain diameter is less than or equal to 45 mu m.

6. The method for preparing the converter large-surface hot patching material as claimed in claim 1, wherein the Cr content in the metallic chromium is more than or equal to 99 wt%, and the particle size is less than or equal to 45 μm.

7. The method for preparing the converter large-area hot patching material as claimed in claim 1, wherein the neopentyl glycol has a particle size of less than 0.2 mm.

8. The preparation method of kinds of converter large-area hot patching materials, according to claim 1, characterized in that, the content of MgO in the magnesite is more than 96 wt%, and the grain size is 3-0.045 mm.

9. The converter large-area hot patching material prepared by the preparation method of any in any of claims 1-8.

Technical Field

The invention relates to the technical field of refractory materials, in particular to converter large-surface hot-state repair materials and a preparation method thereof.

Background

With the popularization of the converter slag splashing furnace protection technology of the converter and the promotion of , the converter life of the converter is improved to about 4 ten thousand heats, but after the converter slag splashing furnace protection technology is applied, the corrosion condition of the converter lining of the converter is correspondingly changed, and the main factors for restricting the improvement of the converter life are changed from the condition that the corrosion of the furnace cap, the trunnion and the like is too fast to the condition that the corrosion of the front and the rear large surfaces of the converter is too fast.

At present, converter large-surface repair materials mainly comprise two types: 1) carbon-based bonded carbonaceous repair material: it mainly uses tar and asphalt as binding agent. From the use effect, the repairing material has good high-temperature fluidity, corrosion resistance and long service life, but has long sintering time, emits dense smoke and releases a large amount of toxic and harmful gases during construction, and has serious environmental pollution; 2) wet water combined magnesium repair material: the hot-state repairing material has relatively short sintering time, no pollution to the environment and can be used for repairing the furnace in time and quickly, but the repairing material has poor adhesion with a furnace lining material, is not resistant to erosion and scouring and has relatively short service life.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides converter large-surface hot-state repair materials and a preparation method thereof, and the repair materials prepared by the method have the advantages of environmental friendliness, good high-temperature self-fluidity, high sintering speed, excellent adhesiveness, high strength, scouring resistance, slag corrosion resistance, low heat conduction and long service life.

The invention is realized by the following technical scheme:

the preparation method of converter large-surface hot patching materials specifically comprises the following steps:

s1: preparing a premix: firstly, mixing and stirring uniformly 35 wt% of forsterite, 3-5 wt% of metal chromium, 10-20 wt% of calcium oxide, 2-10 wt% of lithium oxide, 5-15 wt% of aluminum oxide and 5-8 wt% of neopentyl glycol at 120-150 ℃, and cooling to obtain a premix;

s2: preparing a repairing material: and (3) mixing the premix prepared in the step (S1) with 5-40 wt% of forsterite, 5-10 wt% of magnesite and 0.1-0.5 wt% of polycarboxylic acid plasticizer, and uniformly stirring to prepare the hot repairing material for the large face of the converter.

, the forsterite in steps S1 and S2 mainly comprises the following raw materials by weight>40wt％，SiO₂Content (wt.)<40wt％，Fe₂O₃Content (wt.)<10wt％。

, the CaO content in the calcium oxide is more than 98.5 wt%, and the grain diameter is 1-0.15 mm.

step, Al in the alumina₂O₃The content is more than or equal to 99.5wt percent, and the grain diameter is less than or equal to 45 mu m.

step, Li of said lithium oxide₂The content of O is more than or equal to 99.5wt percent, and the grain diameter is less than or equal to 45 mu m.

, the Cr content in the metal chromium is more than or equal to 99 wt%, and the grain diameter is less than or equal to 45 μm.

Further to step , the neopentyl glycol has a particle size <0.2 mm.

, the content of MgO in the magnesite is more than 96 wt%, and the grain size is 3-0.045 mm.

The converter large-surface hot-state repairing material prepared by the preparation method.

Compared with the prior art, the invention has the beneficial effects that:

in the process of preparing the mending material, the metal chromium and the calcium oxide are uniformly attached to the forsterite particles, the composite prestress is formed under the heat treatment condition along with the partial hydration phenomenon of the calcium oxide, and the lithium zirconate compound (LixAlyOz) can be formed by the lithium oxide and the aluminum oxide under the thermal state mending condition, has various chemical compositions and crystalline phase structures, can promote the rapid sintering of the material, can generate continuous stress due to multiple phase changes in the spraying process, and is combined with the high-temperature deformation and volatilization of neopentyl glycol, so that the material has good high-temperature flow spreadability and excellent adhesiveness, and in the aspect of , the lithium zirconate compound with high lithium content formed in the material serving process can be well adhered to the outside of the mending materialEffective absorption of CO generated from carbon composite refractory₂Gas is used, so that the collapse of the structure can be effectively avoided; meanwhile, the metal chromium is oxidized into chromium oxide, and the chromium oxide enters a lithium zirconate compound in a solid solution mode, so that the material is stable step by step and has good high-temperature strength and corrosion resistance.

Detailed Description

The following examples are presented to illustrate certain embodiments of the invention specifically and should not be construed to limit the scope of the invention the disclosure of the invention may be modified simultaneously from materials, methods and reaction conditions, all of which are intended to fall within the spirit and scope of the invention.