CN103058677A - High-purity Mg-Ca sand and preparation method thereof - Google Patents
High-purity Mg-Ca sand and preparation method thereof Download PDFInfo
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- CN103058677A CN103058677A CN2012105834462A CN201210583446A CN103058677A CN 103058677 A CN103058677 A CN 103058677A CN 2012105834462 A CN2012105834462 A CN 2012105834462A CN 201210583446 A CN201210583446 A CN 201210583446A CN 103058677 A CN103058677 A CN 103058677A
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Abstract
The invention discloses high-purity Mg-Ca sand and a preparation method thereof. The high-purity Mg-Ca sand is prepared mainly from 17 to 62% of lightly calcined dolomite, 20 to 65% of lightly calcined dolomite Mg powder, 15 to 25% of a mixture of a binder and bittern, and 2 to 5% of electric-melting zirconia. The preparation method comprises the following steps of raw material proportioning, raw material blending, ball milling, wet method-based mixing, pressing pelleting, natural drying, sintering and discharging. The high-purity Mg-Ca sand has high green-pressing ball strength, high post-sintering compactness, excellent hydration resistance, high purity and low stable zirconia content and thus a brick prepared from the high-purity Mg-Ca sand has low impurity content and excellent thermal shock resistance. The brick prepared from the high-purity Mg-Ca sand contains a large amount of CaO and thus the brick has excellent molten steel cleaning performances and is especially suitable for production of high-cleanliness steel such as stainless steel.
Description
Technical field
The present invention relates to fire resisting material field, particularly a kind of high-purity calcium magnesite and preparation method.
Background technology
The present domestic refractory raw material calcium magnesia sand that magnesia-calcium brick is used that burns till, generally adopt light-burning magnesium powder, light dolomite dry method or semi-dry pressing, the wedding agent, the additive that adopt are selected materials also undesirable, this class calcium magnesia sand compactness extent is not high, balling-up intensity is not high yet, in the brickmaking use procedure, product volume density is not high, and heat-shock resistance is bad.These all become the bottleneck in the goods use procedure, and cause product to roll off the production line in advance.
Summary of the invention
The present invention has overcome above-mentioned the deficiencies in the prior art, provides a kind of intensity high, and compactness extent is high after burning, hydration resistance is good, burns till low high-purity calcium magnesite of rear impurity content and preparation method thereof.
Technical scheme of the present invention is achieved in that
A kind of high-purity calcium magnesite is characterized in that by following raw materials by weight formulated:
Light dolomite 17%-62%, light-burning magnesium powder 20%-65%, wedding agent: bittern 15-25%, electric-melting zirconia 2-5%.
A kind of preparation method of high-purity calcium magnesite may further comprise the steps:
(1), formula combination is as requested prepared burden, and then inserts and carries out common fine grinding in the ball mill, and Ball-milling Time is no less than 3 minutes, and the particle diameter of powder is less than 0.074mm after the fine grinding;
(2), the powder after the common mill sent into stir the cage sand mill and carry out mixing digestion, then send into baler by conveying belt and carry out the exhaust densification, enter ball press again and suppress balling-up, the travelling speed of ball press and the speed of conveying belt are consistent;
(3), the ball of moulding is stacked, stacking highly is no more than 1.5m, naturally dries 8-10 hour;
(4), the moulding ball after naturally drying is put into vibrating feeder, through conveying belt the moulding ball is evenly joined in the high temperature rotary kiln in the vibrating feeder, firing temperature is controlled at 1700-1800 ℃, and soaking time was burnt till rear cooling discharging at 2-3 hour.
Adopted the invention has the beneficial effects as follows of technique scheme:
The present invention is through the treatment process of rational batching and science, and the synthetic high-purity calcium magnesite of this Wetting of preparation has following advantage:
1. adopt the bittern combination, green compact ball intensity is high, can be increased to density by acceleration of sintering again, and don't affect the composition of goods itself;
2. add a small amount of stable form electric-melting zirconia, one can generate calcium zirconate when burning till, acceleration of sintering, its two, increased the thermal shock performance of material, its three, than add when the brickmaking distribute more even;
3. adopt rotary kiln to burn till, output is high, steady quality;
4. firing temperature can reduce 20-50 ℃, and volume density also can increase 0.05g/cm
3
Goods purity is high, silicon oxide+aluminium sesquioxide+ferric oxide＜2.0%.
A kind of Wetting that the present invention relates to synthesizes high-purity calcium magnesite, by additive and in the selection aspect the wedding agent, has improved greatly the compactness extent of product, the void content of product＜1%, volume density 〉=3.30g/cm
3Owing to added partially stabilized type electric-melting zirconia, promoted sintering, improved the thermal shock resistance energy of brickmaking, provide the foundation for production high-performance high quality magnesia-calcium brick.
Embodiment
The specific embodiment of the present invention is as follows:
Embodiment: produce the synthetic high-purity calcium magnesite of 100 tons of Wettings
1. at first determine production formula, i.e. various raw-material ratios.Prescription is: light dolomite 30%, light-burning magnesium powder 47%, bittern 20%, electric-melting zirconia 3%.According to the consumption that calculates each raw material be: 30 tons of light dolomites; 47 tons of light-burning magnesium powders; 20 tons in bittern, 3 tons of electric-melting zirconias.
2. batching and jointly ball milling.According to above production formula, to prepare burden, the gross weight of each batching is 1000kg, concrete batching is: light dolomite 300kg; Bittern 200kg; Light-burning magnesium powder 470kg; Electric-melting zirconia 30kg.Prepare burden according to formula combination, then insert and carry out common fine grinding in the ball mill machine, Ball-milling Time is no less than 3 minutes, and the particle diameter of powder is less than 0.074mm after the fine grinding.
3. the mixing and pressure ball of wet method.Powder after the common mill sent into stir the cage sand mill and carry out mixing digestion, then send into baler by conveying belt and carry out the exhaust densification, suppress balling-up entering ball press.
4. seasoning.The ball of moulding is stacked, and stacking highly is no more than 1.5m, naturally dries 8-10 hour
5. burn till.Naturally the moulding ball after drying is put into vibrating feeder, through conveying belt the moulding ball is evenly joined in the high temperature rotary kiln in the vibrating feeder, firing temperature is controlled at 1700-1800 ℃, and soaking time is burnt till rear cooling discharging at 2-3h.
6. the physics and chemistry detection index of the synthetic high-purity calcium magnesite of the Wetting of this example is: MgO 67.34%, and CaO27.50%, silicon oxide+aluminium sesquioxide+ferric oxide content are 1.95%, void content 0.7%, volume density 3.32g/cm
3
Claims (2)
1. high-purity calcium magnesite is characterized in that by following raw materials by weight formulated:
Light dolomite 17%-62%, light-burning magnesium powder 20%-65%, wedding agent: bittern 15-25%, electric-melting zirconia 2-5%.
2. the preparation method of a high-purity calcium magnesite is characterized in that may further comprise the steps:
(1), formula combination is as requested prepared burden, and then inserts and carries out common fine grinding in the ball mill, and Ball-milling Time is no less than 3 minutes, and the particle diameter of powder is less than 0.074mm after the fine grinding;
(2), the powder after the common mill sent into stir the cage sand mill and carry out mixing digestion, then send into baler by conveying belt and carry out the exhaust densification, enter ball press again and suppress balling-up, the travelling speed of ball press and the speed of conveying belt are consistent;
(3), the ball of moulding is stacked, stacking highly is no more than 1.5m, naturally dries 8-10 hour;
(4), the moulding ball after naturally drying is put into vibrating feeder, through conveying belt the moulding ball is evenly joined in the high temperature rotary kiln in the vibrating feeder, firing temperature is controlled at 1700-1800 ℃, and soaking time was burnt till rear cooling discharging at 2-3 hour.
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| CN2012105834462A CN103058677A (en) | 2012-12-27 | 2012-12-27 | High-purity Mg-Ca sand and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103964869A (en) * | 2014-05-05 | 2014-08-06 | 大石桥市大岭天成耐火材料有限公司 | Preparation technology of dolomite sand |
| CN104387096A (en) * | 2014-10-31 | 2015-03-04 | 浙江金磊高温材料股份有限公司 | Corundum spinel unburned brick for smelting steel ladle and preparation method of corundum spinel unburned brick |
| CN105036769A (en) * | 2015-07-09 | 2015-11-11 | 长兴泓矿炉料有限公司 | Antioxidant magnesium-calcium-carbon refractory material and preparation method therefor |
| CN105036771A (en) * | 2015-07-09 | 2015-11-11 | 长兴泓矿炉料有限公司 | Refractory material and preparation method therefor |
| CN111410443A (en) * | 2020-04-30 | 2020-07-14 | 海城市军刚中档镁砂有限公司 | MgO-CaO-ZrO2Method for producing sand |
| CN113773057A (en) * | 2021-09-24 | 2021-12-10 | 山西禄纬堡太钢耐火材料有限公司 | High-purity and high-density calcium magnesia and preparation process thereof |
| CN114736004A (en) * | 2022-03-29 | 2022-07-12 | 何猛 | Wet-process ball pressing production process and production line for synthesizing magnesium and aluminum magnesium by light-burned magnesium and calcium |
| CN115947608A (en) * | 2022-12-31 | 2023-04-11 | 辽宁利尔镁质合成材料股份有限公司 | Preparation method of fused synthetic magnesia-calcium sand |
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| CN101921123A (en) * | 2010-08-17 | 2010-12-22 | 浙江金磊高温材料股份有限公司 | Production process of high-purity calcium magnesite |
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| JP2005089271A (en) * | 2003-09-19 | 2005-04-07 | Tsunemi Ochiai | Carbon-containing refractory, its manufacturing method and its use application |
| CN101921123A (en) * | 2010-08-17 | 2010-12-22 | 浙江金磊高温材料股份有限公司 | Production process of high-purity calcium magnesite |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103964869A (en) * | 2014-05-05 | 2014-08-06 | 大石桥市大岭天成耐火材料有限公司 | Preparation technology of dolomite sand |
| CN103964869B (en) * | 2014-05-05 | 2015-10-21 | 大石桥市大岭天成耐火材料有限公司 | The preparation technology of dolomite sand |
| CN104387096A (en) * | 2014-10-31 | 2015-03-04 | 浙江金磊高温材料股份有限公司 | Corundum spinel unburned brick for smelting steel ladle and preparation method of corundum spinel unburned brick |
| CN105036769A (en) * | 2015-07-09 | 2015-11-11 | 长兴泓矿炉料有限公司 | Antioxidant magnesium-calcium-carbon refractory material and preparation method therefor |
| CN105036771A (en) * | 2015-07-09 | 2015-11-11 | 长兴泓矿炉料有限公司 | Refractory material and preparation method therefor |
| CN111410443A (en) * | 2020-04-30 | 2020-07-14 | 海城市军刚中档镁砂有限公司 | MgO-CaO-ZrO2Method for producing sand |
| CN113773057A (en) * | 2021-09-24 | 2021-12-10 | 山西禄纬堡太钢耐火材料有限公司 | High-purity and high-density calcium magnesia and preparation process thereof |
| CN114736004A (en) * | 2022-03-29 | 2022-07-12 | 何猛 | Wet-process ball pressing production process and production line for synthesizing magnesium and aluminum magnesium by light-burned magnesium and calcium |
| CN115947608A (en) * | 2022-12-31 | 2023-04-11 | 辽宁利尔镁质合成材料股份有限公司 | Preparation method of fused synthetic magnesia-calcium sand |
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Application publication date: 20130424 |