CN111410443A - MgO-CaO-ZrO2Method for producing sand - Google Patents
MgO-CaO-ZrO2Method for producing sand Download PDFInfo
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- CN111410443A CN111410443A CN202010364847.3A CN202010364847A CN111410443A CN 111410443 A CN111410443 A CN 111410443A CN 202010364847 A CN202010364847 A CN 202010364847A CN 111410443 A CN111410443 A CN 111410443A
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- cao
- mgo
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- sand
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
- C01G25/02—Oxides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to MgO-CaO-ZrO2A method for preparing sand. The technical scheme is as follows: heat treating dolomite ore and magnesite ore, hydrating, sieving with 0.2mm sieve, drying the filtrate, grinding to below 200 mesh to obtain MgO-CaO2Powder; MgO-CaO powder and Zr (OH)4Putting the sol into a mixer for uniform mixing, pressing balls after mixing, and drying until the water content is less than 1%; finally, the mixture is placed in a kiln for calcination to obtain MgO-CaO-ZrO2And (4) sand. MgO-CaO-ZrO prepared by the invention2The sand has good hydration resistance, high refractoriness, high thermal stability and high resistanceThe alkaline slag has strong erosion capability and purification effect on molten steel, and is an ideal raw material for preparing high-grade materials such as magnesium-calcium refractory materials, ceramics and the like.
Description
Technical Field
The invention relates to the technical field of inorganic chemical industry, in particular to MgO-CaO-ZrO2A method for preparing sand.
Background
The MgO-CaO refractory has good high-temperature stability andthe slag resistance, especially the free CaO in the slag can play a role in purifying molten steel, so the MgO-CaO refractory is widely applied to AOD refining ladles. However, calcium-containing materials are easily hydrated to form Ca (OH)2Causing volume expansion and thus material damage, which greatly limits the use of MgO — CaO materials.
At present, MgO-CaO sand produced by using dolomite is prepared by calcining raw dolomite at about 1000 ℃, and is a first-step product when MgO-CaO sand is calcined by adopting a two-step calcining method. The volume density of the light-burned MgO-CaO sand is very low and is only 1.45g/cm3Left and right. The sintered MgO-CaO sand is a product obtained by sintering dolomite powder at 1700-1800 ℃. Two routes to obtain this product are: one is to directly calcine the natural ore, namely one-step calcination; the other one is a two-step calcining method, in which dolomite is subjected to light burning, crushing, high-pressure ball pressing and high-temperature calcining. In the blank calcined at high temperature, the MgO-CaO sand exposes a new surface, is easy to hydrate and brings great difficulty to production, storage and application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide MgO-CaO-ZrO with simple process2Method for producing sand, MgO-CaO-ZrO produced by the method of the present invention2The sand has good hydration resistance, high refractoriness, strong thermal stability, strong alkaline slag corrosion resistance and purification effect on molten steel.
In order to achieve the purpose, the invention is realized by the following technical scheme:
MgO-CaO-ZrO2The preparation method of the sand is characterized by specifically adopting the following steps:
step one, carrying out heat treatment on dolomite ore and magnesite ore at the temperature of 800-;
step two, the MgO-CaO slurry is filtered through a screen with the aperture of 0.2mm, and the filter obtained by screening is dried for 24-48 hours at the temperature of 100-;
thirdly, grinding the MgO-CaO green body to be less than 200 meshes to obtain MgO-CaO powder;
step four, by mass percent, 70-90 percent of MgO-CaO powder and 10-30 percent of Zr (OH)4Putting the sol into a mixer, mixing for 20-30 minutes to obtain MgO-CaO-ZrO2Material preparation;
step five, adding MgO-CaO-ZrO2The materials are put into a ball press and pressed into MgO-CaO-ZrO with the diameter of 40-60mm under 60-80MPa2Sand ball; MgO-CaO-ZrO2The sand ball is placed at the temperature of 100 ℃ and 110 ℃ for 10 to 20 hours to obtain dry MgO-CaO-ZrO2Sand ball;
step six, drying the MgO-CaO-ZrO2The sand balls are placed in a kiln with the temperature of 1500 plus materials and 1800 ℃ to be calcined for 3 to 5 hours to obtain MgO-CaO-ZrO2And (4) sand.
And (3) carrying out high-yield high.
Zr (OH) in the fourth step4The concentration of the sol is 0.75-1.25 mol/L.
Compared with the prior art, the invention has the beneficial effects that: 1) the invention directly treats MgO-CaO-ZrO2Granulating the powder, and performing low-medium temperature treatment to obtain MgO-CaO-ZrO2Sand; 2) the process is simple, the product does not need to be crushed, the hydration resistance is good, the product can be directly used or stored, and convenience is provided for production; 3) in the heat treatment process, the MgO-CaO-ZrO is hydrated2The dehydration reaction of the powder to finally obtain MgO-CaO-ZrO2The porosity of the sand reaches 30-40%, and the sand serving as a raw material of a refractory material and high-temperature ceramic can achieve the using effects of reducing the weight of the material and insulating heat; 4) during sintering, ZrO2Can react with CaO to generate CaZrO which is not easy to hydrate3Thereby improving the hydration resistance of the product; 5) ZrO (ZrO)2The thermal shock resistance of the product is improved by introducing the thermal shock resistant material into a matrix of the MgO-CaO refractory material.
Detailed Description
The preparation process of the present invention is further illustrated by the following examples:
in the following examples, Zr (OH)4The sol is prepared by ultrasonic mixing 32.25kg zirconium oxychloride, 12kg glacial acetic acid and 100L water at 60 deg.C and 40kHz for 30minAdjusting pH =6 by adding ammonia water, 1 mol/L Zr (OH) was obtained4Sol; the preparation method of the MgO-CaO powder comprises the following steps: carrying out heat treatment on dolomite ore and magnesite ore at 900 ℃ for 3 hours, naturally cooling, and hydrating at room temperature for 24 hours to obtain MgO-CaO slurry; the MgO-CaO slurry is filtered by a screen with the aperture of 0.2mm, and a filter body obtained by screening is dried for 12 hours at the temperature of 100 ℃ to obtain an MgO-CaO green body; and grinding the MgO-CaO green body to below 200 meshes to obtain MgO-CaO powder.
Example 1:
100kg of MgO-CaO powder and 10kg of Zr (OH) having a concentration of 1 mol/L4Placing the sol in a mixer, mixing for 20 minutes to obtain MgO-CaO-ZrO2Material preparation; MgO-CaO-ZrO2The materials are put into a ball press and pressed into MgO-CaO-ZrO with the diameter of 40mm under 60MPa2Sand ball; MgO-CaO-ZrO2The sand ball is placed at 110 ℃ for 10 hours to obtain dry MgO-CaO-ZrO2Sand ball; drying the MgO-CaO-ZrO2Calcining the sand balls in a kiln at 1500 ℃ for 3 hours to obtain MgO-CaO-ZrO2And (4) sand.
The MgO-CaO-ZrO prepared in this example was examined2Sand: CaO content of 40 wt%, MgO content of 50 wt%, and bulk density of 2.7g/cm3(ii) a Keeping the blank at 50 ℃ and 90% humidity for 10h, and drying the blank at 110 ℃ to obtain a blank body with the hydration weight gain rate of 1.5%; the thermal shock resistance times of the MgO-CaO refractory material reach 12 times.
Example 2:
100kg of MgO-CaO powder and 15kg of Zr (OH) having a concentration of 1 mol/L4Placing the sol in a mixer, mixing for 20 minutes to obtain MgO-CaO-ZrO2Material preparation; MgO-CaO-ZrO2The materials are put into a ball press and pressed into MgO-CaO-ZrO with the diameter of 40mm under 70MPa2Sand ball; MgO-CaO-ZrO2Placing the sand ball at 110 ℃ for 12 hours to obtain dry MgO-CaO-ZrO2Sand ball; drying the MgO-CaO-ZrO2Calcining the sand balls in a kiln at 1600 ℃ for 4 hours to obtain MgO-CaO-ZrO2And (4) sand.
The MgO-CaO-ZrO prepared in this example was examined2Sand: CaO content of 43 wt%, MgO content of 46 wt%, and bulk density of 2.9g/cm3(ii) a At 50 ℃ and 9Keeping the temperature for 10 hours under the condition of 0% humidity, and drying the blank at 110 ℃, wherein the hydration weight gain rate of the blank is 1.0%; the thermal shock resistance times of the MgO-CaO refractory material reach 15 times.
Example 3:
100kg of MgO-CaO powder and 20kg of 1 mol/L-based Zr (OH)4Placing the sol in a mixer, mixing for 20 minutes to obtain MgO-CaO-ZrO2Material preparation; MgO-CaO-ZrO2The materials are put into a ball press and pressed into MgO-CaO-ZrO with the diameter of 40mm under 80MPa2Sand ball; MgO-CaO-ZrO2Placing the sand ball at 110 ℃ for 15 hours until the water content is lower than 1 percent to obtain dry MgO-CaO-ZrO2Sand ball; drying the MgO-CaO-ZrO2Calcining the sand balls in a kiln at 1800 ℃ for 5 hours to obtain MgO-CaO-ZrO2And (4) sand.
The MgO-CaO-ZrO prepared in this example was examined2Sand: CaO content of 38 wt%, MgO content of 46 wt%, and bulk density of 3.1g/cm3(ii) a Keeping the blank at 50 ℃ and 90% humidity for 10h, and drying the blank at 110 ℃ to obtain a green body with the hydration weight gain rate of 0.5%; the thermal shock resistance times of the MgO-CaO refractory material reach 19 times.
Claims (3)
1. MgO-CaO-ZrO2The preparation method of the sand is characterized by specifically adopting the following steps:
step one, carrying out heat treatment on dolomite ore and magnesite ore at the temperature of 800-;
step two, the MgO-CaO slurry is filtered through a screen with the aperture of 0.2mm, and the filter obtained by screening is dried for 24-48 hours at the temperature of 100-;
thirdly, grinding the MgO-CaO green body to be less than 200 meshes to obtain MgO-CaO powder;
step four, by mass percent, 70-90 percent of MgO-CaO powder and 10-30 percent of Zr (OH)4Putting the sol into a mixer, mixing for 20-30 minutes to obtain MgO-CaO-ZrO2Material preparation;
step five, adding MgO-CaO-ZrO2Putting the materials into a ball press, pressing the materials into a ball with the diameter of 40-60 ℃ under the pressure of 60-80MPaMgO-CaO-ZrO of mm2Sand ball; MgO-CaO-ZrO2The sand ball is placed at the temperature of 100 ℃ and 110 ℃ for 10 to 20 hours to obtain dry MgO-CaO-ZrO2Sand ball;
step six, drying the MgO-CaO-ZrO2The sand balls are placed in a kiln with the temperature of 1500 plus materials and 1800 ℃ to be calcined for 3 to 5 hours to obtain MgO-CaO-ZrO2And (4) sand.
2. MgO-CaO-ZrO in accordance with claim 12The preparation method of the sand is characterized in that 95% of MgO content in magnesite and 41% of CaO content in dolomite ore are obtained by carrying out labor cultivation in the first step.
3. MgO-CaO-ZrO in accordance with claim 12The preparation method of the sand is characterized in that Zr (OH) in the fourth step4The concentration of the sol is 0.75-1.25 mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010364847.3A CN111410443A (en) | 2020-04-30 | 2020-04-30 | MgO-CaO-ZrO2Method for producing sand |
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| CN202010364847.3A CN111410443A (en) | 2020-04-30 | 2020-04-30 | MgO-CaO-ZrO2Method for producing sand |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142447A (en) * | 2020-09-22 | 2020-12-29 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| WO2022062292A1 (en) * | 2020-09-22 | 2022-03-31 | 武汉科技大学 | Low-thermal-conductivity low-thermal-expansion magnesium-based raw material and preparation method therefor |
| CN114426307A (en) * | 2020-10-09 | 2022-05-03 | 中国石油化工股份有限公司 | Zirconium sol, preparation method thereof and heavy oil catalytic cracking catalyst |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4212679A (en) * | 1978-09-12 | 1980-07-15 | Dresser Industries, Inc. | Method of making magnesite grain |
| CN103058677A (en) * | 2012-12-27 | 2013-04-24 | 浙江金磊高温材料股份有限公司 | High-purity Mg-Ca sand and preparation method thereof |
| CN104163642A (en) * | 2014-07-29 | 2014-11-26 | 沈阳化工大学 | Method for improving hydration resistance of calcined magnesium-calcium refractory material |
| CN106431433A (en) * | 2016-09-14 | 2017-02-22 | 武汉科技大学 | Dense granule magnesia-calcia material and preparation method thereof |
-
2020
- 2020-04-30 CN CN202010364847.3A patent/CN111410443A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4212679A (en) * | 1978-09-12 | 1980-07-15 | Dresser Industries, Inc. | Method of making magnesite grain |
| CN103058677A (en) * | 2012-12-27 | 2013-04-24 | 浙江金磊高温材料股份有限公司 | High-purity Mg-Ca sand and preparation method thereof |
| CN104163642A (en) * | 2014-07-29 | 2014-11-26 | 沈阳化工大学 | Method for improving hydration resistance of calcined magnesium-calcium refractory material |
| CN106431433A (en) * | 2016-09-14 | 2017-02-22 | 武汉科技大学 | Dense granule magnesia-calcia material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 陈树江等: ""以溶胶为结合剂提高莫来石制品体积密度的初步研究"", 《鞍山钢铁学院学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142447A (en) * | 2020-09-22 | 2020-12-29 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| CN112142447B (en) * | 2020-09-22 | 2022-02-25 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| WO2022062292A1 (en) * | 2020-09-22 | 2022-03-31 | 武汉科技大学 | Low-thermal-conductivity low-thermal-expansion magnesium-based raw material and preparation method therefor |
| WO2022062293A1 (en) * | 2020-09-22 | 2022-03-31 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method therefor |
| CN114426307A (en) * | 2020-10-09 | 2022-05-03 | 中国石油化工股份有限公司 | Zirconium sol, preparation method thereof and heavy oil catalytic cracking catalyst |
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