CN107954729B - Synthetic dead-burned magnesia and preparation method thereof - Google Patents
Synthetic dead-burned magnesia and preparation method thereof Download PDFInfo
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- CN107954729B CN107954729B CN201711170482.5A CN201711170482A CN107954729B CN 107954729 B CN107954729 B CN 107954729B CN 201711170482 A CN201711170482 A CN 201711170482A CN 107954729 B CN107954729 B CN 107954729B
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 42
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 37
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 33
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 33
- 239000006004 Quartz sand Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 10
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 10
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 10
- 229910052839 forsterite Inorganic materials 0.000 claims abstract description 7
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000446 fuel Substances 0.000 claims description 17
- 235000012245 magnesium oxide Nutrition 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 239000000571 coke Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 235000019580 granularity Nutrition 0.000 description 11
- 238000005070 sampling Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 240000007643 Phytolacca americana Species 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052611 pyroxene Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to synthetic dead burned magnesia which is prepared by co-sintering 92-98 parts of natural magnesite ore with the granularity of more than 25mm and less than or equal to 100mm and 2-8 parts of quartz sand with the granularity of more than 0mm and less than or equal to 25 mm; the mol ratio of CaO/SiO2 in the finished product is less than 0.5. The preparation method of the synthetic dead burnt magnesia comprises the steps of 1) processing raw materials; 2) preparing materials; 3) mixing and homogenizing; 4) feeding and distributing; 5) sintering; 6) taking the finished product out of the kiln; the invention adopts a method of mixing quartz sand into natural magnesite and then sintering the mixture to ensure that CaO/SiO in the synthesized dead burned magnesite2The molar ratio of (A) is controlled to be less than 0.5, and the cementing phase of the refractory material is forsterite with a high melting point, so that the high-temperature resistance and the erosion resistance of the refractory material are improved.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to synthetic dead-burned magnesia taking forsterite as a binding phase and a preparation method thereof.
Background
The dead burnt magnesia is an important raw material for making common magnesia bricks and unshaped refractory materials, and is usually made by sintering natural magnesite in a fuel shaft kiln at present. However, the CaO/SiO content of the dead-burned magnesite prepared by the existing production process2The molar ratio of (A) to (B) is usually about 1 (between 0.5 and 2.0), and the ratio is innateThe chemical composition of (a) determines that the binder phase is generally low-melting-point forsterite and magnesian rose pyroxene, so that the high-temperature resistance and erosion resistance of the above-mentioned dead burnt magnesite have great defects.
Disclosure of Invention
The invention provides a synthetic dead burnt magnesia and a preparation method thereof, which adopts a method of mixing quartz sand into natural magnesite and then sintering the quartz sand to ensure that CaO/SiO in the synthetic dead burnt magnesia2The molar ratio of (A) is controlled to be less than 0.5, and the cementing phase of the refractory material is forsterite with a high melting point, so that the high-temperature resistance and the erosion resistance of the refractory material are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the synthetic dead-burned magnesia is prepared by co-sintering 92-98 parts of natural magnesite ore with the granularity of more than 25mm and less than or equal to 100mm and 2-8 parts of quartz sand with the granularity of more than 0mm and less than or equal to 25 mm; CaO/SiO in the finished product2The molar ratio of (A) is less than 0.5.
SiO in the natural magnesite according to weight percentage2Less than or equal to 6 percent, less than or equal to 2 percent of CaO and more than or equal to 42 percent of MgO; SiO in the quartz sand according to weight percentage2≥99％。
A method of making the synthetic dead-burned magnesite clinker of claim 1, comprising the steps of:
1) processing raw materials;
crushing natural magnesite in a crusher to prepare a blocky raw material with the granularity of more than 25mm and less than or equal to 100mm, and crushing quartz sand in the crusher to prepare a blocky raw material with the granularity of more than 0mm and less than or equal to 25 mm;
2) preparing materials;
CaO/SiO in synthetic dead-burned magnesia2The molar ratio of (A) is calculated by the following formula:
wherein: adding X-magnesite in percentage by mass;
adding 1-X-quartz sand in percentage by mass;
W(CaO)I-weight percentage of CaO in magnesite;
W(SiO2)ISiO in magnesite2Weight percentage;
W(CaO)II-CaO weight percentage in quartz sand;
W(SiO2)IISiO in Quartz Sand2Weight percentage;
3) mixing and homogenizing;
mixing and homogenizing processed natural magnesite and quartz sand raw materials according to a ratio; uniformly mixing the two raw materials with fuel, wherein the mixing weight ratio of the two raw materials to the fuel is 15-25%;
4) feeding and distributing;
conveying the homogenized mixed material to the upper part of a shaft kiln, then distributing the material in the shaft kiln, wherein the shaft kiln adopts an intermittent production mode, the material surface is flattened before loading and distributing the material, and the material distribution thickness is 1200-1500mm each time;
5) sintering;
air supply is carried out for 3 times after the cloth is distributed; firstly, blowing for 20-30 minutes by using small wind with the maximum wind quantity of 20-30% to ignite the fuel; when smoke is removed from the mixed material, the air quantity is increased to 70% -80% of the maximum air quantity, and the blowing is continued for 1-1.5 hours; then increasing the air quantity to more than 90% of the maximum air quantity and blowing for 0.4-0.6 hours;
6) taking the finished product out of the kiln;
when the material layer is in a pan bottom shape, seams are formed at the periphery and the middle part is cracked, the fire is weakened, and the material surface is whitened, the material layer is taken out of the kiln; the drawing depth is controlled according to 1200-1500 mm.
The fuel is coke or Ningxia white coal, and the heat value is more than or equal to 7000 kilocalories.
Compared with the prior art, the invention has the beneficial effects that:
1) the added quartz sand has the function of adjusting CaO/SiO in the synthesized dead burned magnesia2The effect of CaO/SiO in the finished product2The molar ratio of the above-mentioned materials is controlled below 0.5, so that the combined phase between periclase is forsterite with high melting point, and the high-temp. resistance and corrosion resistance of the synthesized dead-burned magnesite are effectively raised;
2) the synthetic dead burned magnesia is used as a raw material, so that various technical properties and use effects of a refractory product can be greatly improved, the technical level of the refractory material in China is improved, and the industry competitiveness is improved.
Detailed Description
The synthetic dead burned magnesia is prepared by co-sintering 92-98 parts by weight of natural magnesite ore with the granularity of more than 25mm and less than or equal to 100mm and 2-8 parts by weight of quartz sand with the granularity of more than 0mm and less than or equal to 25 mm; CaO/SiO in the finished product2The molar ratio of (A) is less than 0.5.
SiO in the natural magnesite according to weight percentage2Less than or equal to 6 percent, less than or equal to 2 percent of CaO and more than or equal to 42 percent of MgO; SiO in the quartz sand according to weight percentage2≥99％。
A method of making the synthetic dead-burned magnesite clinker of claim 1, comprising the steps of:
3) processing raw materials;
crushing natural magnesite in a crusher to prepare a blocky raw material with the granularity of more than 25mm and less than or equal to 100mm, and crushing quartz sand in the crusher to prepare a blocky raw material with the granularity of more than 0mm and less than or equal to 25 mm;
4) preparing materials;
CaO/SiO in synthetic dead-burned magnesia2The molar ratio of (A) is calculated by the following formula:
wherein: adding X-magnesite in percentage by mass;
adding 1-X-quartz sand in percentage by mass;
W(CaO)I-weight percentage of CaO in magnesite;
W(SiO2)ISiO in magnesite2Weight percentage;
W(CaO)II-CaO weight percentage in quartz sand;
W(SiO2)IISiO in Quartz Sand2Weight percentage;
3) mixing and homogenizing;
mixing and homogenizing processed natural magnesite and quartz sand raw materials according to a ratio; uniformly mixing the two raw materials with fuel, wherein the mixing weight ratio of the two raw materials to the fuel is 15-25%;
4) feeding and distributing;
conveying the homogenized mixed material to the upper part of a shaft kiln, then distributing the material in the shaft kiln, wherein the shaft kiln adopts an intermittent production mode, the material surface is flattened before loading and distributing the material, and the material distribution thickness is 1200-1500mm each time;
5) sintering;
air supply is carried out for 3 times after the cloth is distributed; firstly, blowing for 20-30 minutes by using small wind with the maximum wind quantity of 20-30% to ignite the fuel; when smoke is removed from the mixed material, the air quantity is increased to 70% -80% of the maximum air quantity, and the blowing is continued for 1-1.5 hours; then increasing the air quantity to more than 90% of the maximum air quantity and blowing for 0.4-0.6 hours;
6) taking the finished product out of the kiln;
when the material layer is in a pan bottom shape, seams are formed at the periphery and the middle part is cracked, the fire is weakened, and the material surface is whitened, the material layer is taken out of the kiln; the drawing depth is controlled according to 1200-1500 mm.
The fuel is coke or Ningxia white coal, and the heat value is more than or equal to 7000 kilocalories.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
The example includes examples 1-3, and table 1 shows the raw material formulation for synthesizing dead-burned magnesite in 3 examples;
TABLE 1
| Ingredients | Example 1 | Example 2 | Example 3 |
| Magnesite ore with thickness of 25-100 mm | 98％ | 95％ | 92％ |
| 0-25 mm quartz sand | 2％ | 5％ | 8％ |
The chemical compositions of the two raw materials are shown in table 2:
TABLE 2
The method for preparing the synthetic dead burnt magnesite with forsterite as the binder phase in the above examples 1 to 3 includes the following steps:
1) processing raw materials;
crushing natural magnesite in a crusher to prepare a blocky raw material with the granularity of more than 25mm and less than or equal to 100mm, and crushing quartz sand in the crusher to prepare a blocky raw material with the granularity of more than 0mm and less than or equal to 25 mm;
ingredients
2) Preparing materials;
CaO/SiO in synthetic dead-burned magnesia2The molar ratio of (A) is calculated by the following formula:
wherein: adding X-magnesite in percentage by mass;
adding 1-X-quartz sand in percentage by mass;
W(CaO)I-weight percentage of CaO in magnesite;
W(SiO2)ISiO in magnesite2Weight percentage;
W(CaO)II-CaO weight percentage in quartz sand;
W(SiO2)IISiO in Quartz Sand2Weight percentage;
3) mixing and homogenizing;
mixing and homogenizing processed natural magnesite and quartz sand on a cement ground of a mine storage site by a forklift according to a ratio; and uniformly mixing the two raw materials with fuel, wherein the mixing weight ratio of the two raw materials to the fuel (coke or Ningxia white coal) is 15-25%.
4) Feeding and distributing;
the homogenized mixed material is conveyed to a working platform of the shaft kiln by a lifter, then the material is distributed in the shaft kiln, the shaft kiln adopts an intermittent production mode, and after a previous batch of finished products are discharged out of the kiln, the material surface is leveled by inserting a drill rod before distributing the material on the kiln.
The thickness of each distribution is 1200-1500mm (equivalent to the discharge amount each time, the shaft kiln is filled after the distribution).
5) Sintering and protecting the kiln;
air supply is carried out for 3 times after the materials are loaded and distributed; firstly, blowing for 20-30 minutes by using small wind with the maximum wind quantity of 20-30% to ignite the fuel; when smoke is removed from the mixed material, the air quantity is increased to 70-80% of the maximum air quantity (medium air quantity), and the mixed material is continuously blown for 1-1.5 hours; then, increasing the air quantity to be more than 90% of the maximum air quantity (large air quantity) and blowing for 0.4-0.6 hours;
in the embodiment, when the air volume is small, the frequency conversion instruction of the fan is 20-30 Hz; the frequency conversion instruction is 70-80 Hz when the air quantity is medium, and the frequency conversion instruction is 100 Hz when the air quantity is large.
During the blowing period, kiln protection is needed. Pressing the local fire blowby parts around with the small burnback particles, plugging a wind channel by using a steel drill rod to poke nearby material balls if the local fire blowby is violent, feeding a small amount of coal, pressing the small burnback particles again, and forcing the fire to go to the middle of the kiln.
The time of blowing the strong wind can not be overlong, so that the situation that the material is blown to be cold due to the fact that the fuel is burnt out, and the material cannot be smoothly ignited when being distributed next time is avoided.
6) Drawing out of the kiln;
when the material layer in the kiln is in a pot bottom shape, seams are formed at the periphery and cracks are formed in the middle, the material layer is taken out when the fire is weak and the material surface is slightly white, and the drawing depth is controlled by 1500mm together with 1200 materials.
7) Detecting and packaging (or warehousing);
and respectively sampling and detecting the sorted and classified finished products, packaging qualified products and warehousing the qualified products, or processing the finished products into different granularities according to the requirements of users and then packaging and shipping the finished products.
Sampling and acceptance inspection are carried out according to YB 367-75 'sampling, acceptance inspection, storage and transportation rules of refractory products'; randomly sampling for chemical component analysis;
the physical and chemical indexes of the finished products of examples 1-3 are shown in Table 3.
TABLE 3
| W(MgO)/％ | ≥90 | ≥85 | ≥80 |
| CaO/SiO2(molar ratio) | ＜0.5 | ＜0.5 | ＜0.5 |
| Particle bulk density/g/cm3 | ≥3.1 | ≥3.1 | ≥3.1 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The preparation method of the synthetic dead burnt magnesia is characterized in that the synthetic dead burnt magnesia is formed by co-sintering 92-98 parts of natural magnesite ore with the granularity of more than 25mm and less than or equal to 100mm and 2-8 parts of quartz sand with the granularity of more than 0mm and less than or equal to 25mm according to the weight part ratio; CaO/SiO in the finished product2The molar ratio of (A) is less than 0.5; the bonding phase between periclase is forsterite; the weight percentage of MgO in the finished product is more than or equal to 80 percent;
the preparation method of the synthetic dead-burned magnesite comprises the following steps:
1) processing raw materials;
crushing natural magnesite in a crusher to prepare a blocky raw material with the granularity of more than 25mm and less than or equal to 100mm, and crushing quartz sand in the crusher to prepare a blocky raw material with the granularity of more than 0mm and less than or equal to 25 mm;
2) preparing materials;
CaO/SiO in synthetic dead-burned magnesia2The molar ratio of (A) is calculated by the following formula:
wherein: adding X-magnesite in percentage by mass;
adding 1-X-quartz sand in percentage by mass;
W(CaO)I-weight percentage of CaO in magnesite;
W(SiO2)ISiO in magnesite2Weight percentage;
W(CaO)II-CaO weight percentage in quartz sand;
W(SiO2)IISiO in Quartz Sand2Weight percentage;
3) mixing and homogenizing;
mixing and homogenizing processed natural magnesite and quartz sand raw materials according to a ratio; uniformly mixing the two raw materials with fuel, wherein the mixing weight ratio of the two raw materials to the fuel is 15-25%;
4) feeding and distributing;
conveying the homogenized mixed material to the upper part of a shaft kiln, then distributing the material in the shaft kiln, wherein the shaft kiln adopts an intermittent production mode, the material surface is flattened before loading and distributing the material, and the material distribution thickness is 1200-1500mm each time;
5) sintering;
air supply is carried out for 3 times after the cloth is distributed; firstly, blowing for 20-30 minutes by using small wind with the maximum wind quantity of 20-30% to ignite the fuel; when smoke is removed from the mixed material, the air quantity is increased to 70% -80% of the maximum air quantity, and the blowing is continued for 1-1.5 hours; then increasing the air quantity to more than 90% of the maximum air quantity and blowing for 0.4-0.6 hours;
6) taking the finished product out of the kiln;
when the material layer is in a pan bottom shape, seams are formed at the periphery and the middle part is cracked, the fire is weakened, and the material surface is whitened, the material layer is taken out of the kiln; the drawing depth is controlled according to 1200-1500 mm.
2. A process for the preparation of synthetic dead burnt magnesite according to claim 1, characterised in that the natural magnesite ore contains SiO in weight percentage2Less than or equal to 6 percent, less than or equal to 2 percent of CaO and more than or equal to 42 percent of MgO; SiO in the quartz sand according to weight percentage2≥99％。
3. A method of producing synthetic dead burnt magnesite according to claim 1, wherein the fuel is coke or Ningxia white coal having a calorific value of 7000 kcal or more.
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| CN111333351B (en) * | 2020-04-30 | 2022-04-01 | 海城市军刚中档镁砂有限公司 | Raw material homogenizing process for dead burned magnesia shaft kiln |
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| RU2378218C2 (en) * | 2008-02-19 | 2010-01-10 | ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ Научно-производственное предприятие "МагиЛит" | Raw composition for manufacturing of construction materials and products |
| CN102351441A (en) * | 2011-07-21 | 2012-02-15 | 辽宁科技大学 | Method for producing dead-burned magnesia through one-step calcination of magnesite tailings |
| CN103011870A (en) * | 2013-01-17 | 2013-04-03 | 武汉科技大学 | Forsterite refractory and production method thereof |
| CN104961473A (en) * | 2015-06-02 | 2015-10-07 | 海城华宇耐火材料有限公司 | Method for producing export magnesium-rich olivine sand with MgO content less than 70% |
| CN205045995U (en) * | 2015-09-18 | 2016-02-24 | 后英集团海城市高新技术产品有限公司 | Dead burnt magnesite sand shaft kiln semi -automatization manufacturing equipment |
| CN107188584A (en) * | 2017-07-18 | 2017-09-22 | 海城市中兴镁质合成材料有限公司 | A kind of fused magnesite and its preparation technology using dicalcium silicate as combination phase |
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Address after: 114206 Bali Town wangjiakan village, Haicheng City, Anshan City, Liaoning Province Applicant after: Liaoning lier magnesium synthetic material Co.,Ltd. Applicant after: HAICHENG LIER MAIGE XITA MATERIAL Co.,Ltd. Address before: 114206 Bali Town wangjiakan village, Haicheng City, Anshan City, Liaoning Province Applicant before: HAICHENG ZHONGXING MAGNESIUM SYNTHETIC MATERIAL Co.,Ltd. Applicant before: HAICHENG LIER MAIGE XITA MATERIAL Co.,Ltd. |
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