CN103771875A - Preparation method for low silicon magnesium calcium tundish dry vibration material - Google Patents

Abstract

The invention discloses a preparation method for a low silicon magnesium calcium tundish dry vibration material. The preparation method comprises the following steps: 1) respectively mixing 13 to 15 parts of 3-to-1-mm-large magnesia with 13 to 15 parts of 3-to-1-mm-large konite clinker, 16 to 20 parts of 1-to-0.074-mm-large magnesia with 16 to 20 parts of 1-to-0.074-mm-large konite clinker and 6 to 8 parts of less-than-0.074-mm-large magnesia with 6 to 8 parts of less-than-0.074-mm-large konite clinker for 3 to 5 min, then mixing the obtained three mixtures, adding 10 to 12 parts of fine magnesia powder with a particle size of less than 0.088 mm, carrying out mixing for 6 to 10 min, then adding 1 to 2 parts of bentonite, 4 to 6 parts of carboxy methyl starch and 1 to 3 parts of anhydrous calcium chloride and carrying out mixing for 15 to 20 min again; and 2) subjecting a mixture obtained in the step 1) to vibration molding with a forming mold according to the prior art, carrying out baking at a temperature of 220 to 240 DEG C for 18 to 24 h and then carrying out demolding.

Description

A kind of preparation method of low silicon magnesium calcium tundish dry vibrating material

Technical field

The present invention relates to metallurgical technical field of refractory materials, relate in particular to a kind of preparation method of low silicon magnesium calcium tundish dry vibrating material.

Background technology

Tundish is last metallurgical tank of process for making, along with the breakthrough of continuous casting tundish Quick changing gate technology, liner in dundish has experienced heat-insulating shield and after the coating stage, start development and exploitation dry-type vibration material for tundish, improve the work-ing life of tundish, reduced energy consumption.For example: " alkaline dry liner for intermediate ladle of continuous casting " (CN01115190.0) patented technology is the unsetting composition take magnesia as main body, its component is counted by quality percentage composition: magnesia 85～95%, boride 0.5～3.0%, thermoplastic material 2～10%, phosphoric acid salt 1～3%, fluorochemical 1～3%; " the calcareous dry-type working lining of a kind of novel tundish magnesium " (CN02 117935.2) patented technology is take synthetic magnesia-calcium clinker, passivation dolomite sand, passive lime stone sand, calcined dolomite sand, lime kilning stone sand etc. as calcareous raw material, take iron scale, clay, silicon powder etc. as sintering aid, take resin, malt sugar, PVC as bonding agent, through evenly mixing and make dry type lining material; " tundish dry type work lining mass of magnesiodolomite " (CN200610066295.8) patented technology mainly by magnesia, rhombspar aggregate and magnesia, a-Al ₂o ₃fine powder and composite additive and resol are mixed in proportion and form; " a kind of preparation method of tundish dry vibratory material " (CN 2,006 10018503.7) patented technology is mixed 85～97% magnesia or forsterite by quality percentage composition with 3～15% Starso, after stirring, adopt fetal membrane vibratory compaction, 100～400 ℃ of bakings, the demoulding obtains tundish dry vibratory material; " a kind of novel dry working lining " (CN 02 117371.0) patented technology is take magnesia, olivine sand, synthetic magnesia-calcium clinker, passivation dolomite sand, passive lime stone sand, calcining olivine sand as basic raw material, with Tai-Ace S 150 (Al ₂(SO ₄) ₃18H ₂o), polymerize aluminum chloride (AlCl ₃6H ₂o), halogen (MgCl ₂6H ₂o) be bonding agent, take iron scale, clay, silicon powder as sintering aid; " magnesium calcium carbon tundish dry working lining " (CN200510059787.X) patented technology is the uniform mixtures such as electrosmelted magnesite clinker, calcium magnesia sand, graphite, composite additive and resol; " a kind of preparation method of dry working lining " (CN 2,007 10062203.3) patented technology is mixed 85.95% magnesia by quality percentage composition with 5～15% glucose or citric acid, adopt the vibratory compaction of mould tire after stirring; " calcareous dry working lining material of a kind of magnesium and preparation method thereof " (CN 200810048640.4) patented technology in magnesia, magnesite, Wingdale, rhombspar, slaked lime is basic raw material, take glucide and its ramification, Starso, moisture water glass as bonding agent, take iron scale, silicon powder, borax, clay, graphite, carbon black as additive, after stirring and vibratory compaction, under 200～350 ℃ of conditions, toast, the demoulding obtains dry working lining material; " a kind of environment-friendly type pouring box drying type vibrating material wedding agent " (CN200810050143.8) patented technology take weight percent as unit, the phosphoric acid salt that contains sodium or boron glass 10～80%, magnesium salts 15～85%, alkalimetal silicate or borate 0.01～5%.Though above-mentioned dry materials has easy construction, energy input is little, the life-span is long and the feature of raising tundish working efficiency, but there is following shortcoming: resol not only expensive, cost is high, and irritant gas is as generations such as ammonia, formaldehyde and free phenols in bake process, contaminate environment, harm workers ' health, the carbon after charing, hydrogen have obvious carburetting to increase hydrogen effect; Dry materials take phosphoric acid salt, vitriol as bonding agent has equally strong and stimulating γ-ray emission in baking and use procedure, contaminate environment, harm workers ' health; Take water glass, Starso as bonding agent, introduce a large amount of " silicon " and " sodium " and can cause molten steel oxygenation, eutectic to increase, the metallurgical effect of remarkably influenced material, applied at elevated temperature performance and by rear disintegration performance.

Summary of the invention

The object of the invention is to propose a kind of preparation method of low silicon magnesium calcium tundish dry vibrating material, this vibration material has that cost is low, environmental friendliness, save energy, have higher company water rate, good metallurgical effect and use after be easy to the excellent properties such as disintegration.

For reaching this object, the present invention by the following technical solutions:

A kind of preparation method of low silicon magnesium calcium tundish dry vibrating material, the raw material of described vibration material is made up of following component in weight part: magnesia 13-15 part of 3-1mm, 1-0.074mm magnesia 16-20 part, magnesia 6-8 part of < 0.074mm, 3-1mm konite grog 13-15 part, 1-0.074mm konite grog 16-20 part, konite grog 6-8 part of < 0.074mm, wherein the CaO content in konite grog is 40-60%, magnesia powder 10-12 part of < 0.088mm, wilkinite 1-2 part, carboxymethyl starch 4-6 part, Calcium Chloride Powder Anhydrous 1-3 part, described preparation method is:

1) first by the magnesia of 3-1mm and konite grog, 1-0.074mm magnesia and konite grog, and the magnesia of < 0.074mm and konite grog mix respectively 3-5 minute, then three kinds of compounds is admixed together and add the magnesia powder of < 0.088mm and mix 6-10 minute, finally add wilkinite, carboxymethyl starch, Calcium Chloride Powder Anhydrous remix 15-20 minute;

2) above-mentioned compound is adopted to fetal membrane vibratory compaction by prior art, then under 220-240 ℃ of condition, toast 18-24 hour, the demoulding.

Owing to adopting technique scheme, environmental friendliness of the present invention, baking time is short, and quick baking is without explosion and obscission; The requirement of cylinder-packing high calcium and insulation in the middle of prepared product meets, intensity is high, has good cleaning molten steel function, and good in the rear disintegration performance of use, is easy to turn over bag.The present invention is take magnesia and konite grog as main raw material, and adopting carboxymethyl starch and appropriate wilkinite is bonding agent.Bonding agent is not only cheap, baking non-environmental-pollution, and while avoiding using, eutectic is too much and molten steel oxygenation, increase silicon and pollute molten steel; Add inorganic salt, not only in warm acceleration of sintering ability strong, and under high temperature also can with substrate material generating portion high temperature substrate phase, improve the calcareous dry-type vibration material high-temperature behavior of low silicon magnesium.The konite grog wide material sources that adopt, low price and be difficult for aquation, is convenient to depositing of material; CaO is wherein conducive to purifying of steel, and Al2O3, the SiO2 etc. in absorption molten steel is mingled with and reduces harmful element in steel [S], [P] content, and this smelts Clean Steel is very important; Meanwhile, the prepared calcareous dry-type vibration material of low silicon magnesium have that high, the resistance to molten steel impact capacity of middle adiabator bonding strength is strong, high-temperature anti-corrosion and impermeabilisation ability is strong, the feature of long service life; Lower temperature baking can extremely be used in the demoulding, save energy, and after using, disintegration performance is good, is easy to turn over bag.

The present invention has following beneficial effect:

1) the present invention adopts the magnesia of corresponding granularity and konite grog to carry out proportioning as major ingredient, in conjunction with the advantage of the two, has ensured the performance of vibration material.

2) the present invention first mixes the vibration material of corresponding granularity, more mixed material is respectively mixed, and has guaranteed to mix, and has guaranteed the performance of the performance of design proportioning from technique.

3) simple, the easy construction of technique of the present invention, cost is low, environmental friendliness, save energy; Prepared low silicon magnesium calcium tundish dry vibrating material quick baking, without explosion and obscission, has higher company and waters rate, is easy to the feature of disintegrating after good metallurgical effect and use.

Embodiment

Embodiment mono-

A kind of preparation method of low silicon magnesium calcium tundish dry vibrating material, the raw material of described vibration material is made up of following component in weight part: 13 parts, the magnesia of 3-1mm, 1-0.074mm 20 parts, magnesia, 6 parts, the magnesia of < 0.074mm, 15 parts, 3-1mm konite grog, 1-0.074mm 16 parts, konite grog, 8 parts, the konite grog of < 0.074mm, wherein the CaO content in konite grog is 40-60%, 10 parts of the magnesia powders of < 0.088mm, 2 parts of wilkinites, 4 parts of carboxymethyl starch, 3 parts of Calcium Chloride Powder Anhydrouss, described preparation method is:

1) first by the magnesia of 3-1mm and konite grog, 1-0.074mm magnesia and konite grog, and the magnesia of < 0.074mm and konite grog mix respectively 3 minutes, then three kinds of compounds is admixed together and add the magnesia powder of < 0.088mm and mix 10 minutes, finally add wilkinite, carboxymethyl starch, Calcium Chloride Powder Anhydrous remix 15 minutes;

2) above-mentioned compound is adopted to fetal membrane vibratory compaction by prior art, then under 220 ℃ of conditions, toast 24 hours the demoulding.

Embodiment bis-

A kind of preparation method of low silicon magnesium calcium tundish dry vibrating material, the raw material of described vibration material is made up of following component in weight part: 15 parts, the magnesia of 3-1mm, 1-0.074mm 16 parts, magnesia, 8 parts, the magnesia of < 0.074mm, 13 parts, 3-1mm konite grog, 1-0.074mm 20 parts, konite grog, 6 parts, the konite grog of < 0.074mm, wherein the CaO content in konite grog is 40-60%, 12 parts of the magnesia powders of < 0.088mm, 1 part of wilkinite, 6 parts of carboxymethyl starch, 1 part of Calcium Chloride Powder Anhydrous, described preparation method is:

1) first by the magnesia of 3-1mm and konite grog, 1-0.074mm magnesia and konite grog, and the magnesia of < 0.074mm and konite grog mix respectively 5 minutes, then three kinds of compounds is admixed together and add the magnesia powder of < 0.088mm and mix 6 minutes, finally add wilkinite, carboxymethyl starch, Calcium Chloride Powder Anhydrous remix 20 minutes;

2) above-mentioned compound is adopted to fetal membrane vibratory compaction by prior art, then under 240 ℃ of conditions, toast 18 hours the demoulding.

Embodiment tri-

A kind of preparation method of low silicon magnesium calcium tundish dry vibrating material, the raw material of described vibration material is made up of following component in weight part: 14 parts, the magnesia of 3-1mm, 1-0.074mm 18 parts, magnesia, 7 parts, the magnesia of < 0.074mm, 14 parts, 3-1mm konite grog, 1-0.074mm 18 parts, konite grog, 7 parts, the konite grog of < 0.074mm, wherein the CaO content in konite grog is 40-60%, 11 parts of the magnesia powders of < 0.088mm, 1.5 parts of wilkinites, 5 parts of carboxymethyl starch, 2 parts of Calcium Chloride Powder Anhydrouss, described preparation method is:

1) first by the magnesia of 3-1mm and konite grog, 1-0.074mm magnesia and konite grog, and the magnesia of < 0.074mm and konite grog mix respectively 4 minutes, then three kinds of compounds is admixed together and add the magnesia powder of < 0.088mm and mix 8 minutes, finally add wilkinite, carboxymethyl starch, Calcium Chloride Powder Anhydrous remix 18 minutes;

2) above-mentioned compound is adopted to fetal membrane vibratory compaction by prior art, then under 230 ℃ of conditions, toast 21 hours the demoulding.

Claims (1)

1. the preparation method of one kind low silicon magnesium calcium tundish dry vibrating material, it is characterized in that, the raw material of described vibration material is made up of following component in weight part: magnesia 13-15 part of 3-1mm, 1-0.074mm magnesia 16-20 part, magnesia 6-8 part of < 0.074mm, 3-1mm konite grog 13-15 part, 1-0.074mm konite grog 16-20 part, konite grog 6-8 part of < 0.074mm, wherein the CaO content in konite grog is 40-60%, magnesia powder 10-12 part of < 0.088mm, wilkinite 1-2 part, carboxymethyl starch 4-6 part, Calcium Chloride Powder Anhydrous 1-3 part, described preparation method is:

1) first by the magnesia of 3-1mm and konite grog, 1-0.074mm magnesia and konite grog, and the magnesia of < 0.074mm and konite grog mix respectively 3-5 minute, then three kinds of compounds is admixed together and add the magnesia powder of < 0.088mm and mix 6-10 minute, finally add wilkinite, carboxymethyl starch, Calcium Chloride Powder Anhydrous remix 15-20 minute;

2) above-mentioned compound is adopted to fetal membrane vibratory compaction by prior art, then under 220-240 ℃ of condition, toast 18-24 hour, the demoulding.