Additive for anhydrous stemming and preparation method thereof

Abstract

The invention relates to an additive for anhydrous stemming and a preparation method thereof. The preparation method comprises the following steps: preparing following raw materials in percentage by weight at first: 35 to 55 wt% of andalusite fine powder; 10-30 wt% of kyanite fine powder, 6-16 wt% of titanium oxide fine powder, 5-15 wt% of silicon oxynitride fine powder, 3-7 wt% of titanium aluminum carbide fine powder, 3-7 wt% of earthy graphite fine powder, 1-3 wt% of simple substance silicon fine powder, 2-5 wt% of bentonite fine powder and 2-5 wt% of nickel oxide fine powder; adding 0.5-2.5 wt% of polypropylene fibers and 7-15 wt% of cobalt modified phenolic resin fine powder into the raw materials, and mixing in a mixer for 20-30 minutes to obtain the additive for anhydrous stemming,wherein the Al2O3 content of the andalusite fine powder is more than 52 wt%, the particle size of the andalusite fine powder is less than 75 [mu]m; the Al2O3 content of the kyanite fine powder is larger than 54 wt%, and the particle size of the kyanite fine powder is smaller than 45 [mu]m. The prepared additive for the anhydrous stemming does not pollute the environment, and can obviously improvethe strength, the volume stability, the oxidation resistance and the erosion resistance of the anhydrous stemming.

Description

technical field [0001] The invention belongs to the technical field of additives for gun clay. Specifically relates to an additive for anhydrous taphole clay and a preparation method thereof. Background technique [0002] Taphole clay is one of the important refractory materials in front of the blast furnace, and its performance directly affects ironmaking production. Generally speaking, when the blast furnace does not produce slag and iron, the taphole is filled in the taphole to maintain a sufficient depth; when the blast furnace is tapping, the center of the blasthole mud in the taphole is drilled out of the tunnel, and the slag and iron are discharged out of the furnace through the tunnel. In order to make the working state of the iron mouth stable and meet the needs of blast furnace intensified smelting, it is required that the blast furnace clay has better workability, volume stability and sintering performance, and has good oxidation resistance, erosion resistance an...

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Problems solved by technology

The patented technology of "Additives for Cracking Clay to Suppress Sputtering of Iron Cutters" (CN104276828A) uses metal silicon powder, boron carbide, asphalt, silicon nitride and kyanite as raw materials to prepare Cracking Clay that can better suppress the spattering of Cutters Additives are used, but too much bitumen in the additives will seriously pollute the environment. It is difficult to promote the sintering of the clay at lower temperatures, and cannot obtain high strength for the clay, and more glass phases will be produced in the clay at high temperatures. Affect the volume stability of the clay

"Blast furnace mud additive that can prolong the depth of the blast furnace tap hole" (CN104098338A) patented technology, although kyanite fine powder, industrial grade sulfur powder, sericite powder, elemental silicon and silica fume are used as raw materials to prepare blast furnace mud additives, but it cannot Effectively improve the anti-oxidation performance of the clay, and the potassium oxide and iron oxide impurities in the sericite powder will significantly reduce the anti-corrosion performance of the clay

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