CN113583294A - High-temperature-resistant high-pressure-resistant moistureproof magnesium oxide for fireproof cable, and preparation method and application thereof - Google Patents
High-temperature-resistant high-pressure-resistant moistureproof magnesium oxide for fireproof cable, and preparation method and application thereof Download PDFInfo
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- CN113583294A CN113583294A CN202110868198.5A CN202110868198A CN113583294A CN 113583294 A CN113583294 A CN 113583294A CN 202110868198 A CN202110868198 A CN 202110868198A CN 113583294 A CN113583294 A CN 113583294A
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 101
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 5
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 5
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 27
- 235000012211 aluminium silicate Nutrition 0.000 claims description 27
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 21
- 229910052634 enstatite Inorganic materials 0.000 claims description 20
- BBCCCLINBSELLX-UHFFFAOYSA-N magnesium;dihydroxy(oxo)silane Chemical compound [Mg+2].O[Si](O)=O BBCCCLINBSELLX-UHFFFAOYSA-N 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 19
- 239000003921 oil Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000003607 modifier Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 150000004645 aluminates Chemical class 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000007822 coupling agent Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides magnesium oxide for a high-temperature-resistant high-pressure-resistant moistureproof cable, and a preparation method and application thereof. The invention relates to high-temperature-resistant high-pressure-resistant moistureproof magnesium oxide for a fireproof cable, which comprises the following components in percentage by weight: MgO is more than or equal to 96 percent by weight; CaO is less than or equal to 1.0 percent by weight; fe2O3≤0.45％wt；Al2O3≤0.3％wt；SiO2Less than or equal to 2.0 percent by weight; LOI is less than or equal to 0.2 percent by weight. The invention also discloses a preparation method of the magnesium oxide for the high-temperature-resistant high-pressure-resistant moistureproof cable. The magnesium oxide cable is not required to be baked before being made, and the preparation method is simple and easy to implement; the cable prepared by the cable has the maximum breakdown resistance and can be high in the environment with the temperature of 25 ℃ and the humidity of 80 percent RHUp to 3000V.
Description
Technical Field
The invention relates to a magnesium oxide technology, in particular to magnesium oxide for a high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable, a preparation method and application thereof.
Background
With the rapid development of national economy, the safety of electrical lines in factories and large buildings is of great importance. The cable is a main body in the circuit and is a link difficult to protect. Therefore, the cable should not only have the capability of resisting the damage of external flame, but also have the characteristic of not generating fire source by itself. Because the mineral insulated cable is made of inorganic materials, the magnesium oxide insulator can not generate open fire when in overload or short circuit. The mineral insulated cable with high breakdown resistance can ensure the normal starting of fire-fighting equipment, prolong the cable running time and provide precious time for fire suppression and evacuation of personnel.
The insulation cable made of the traditional magnesium oxide has the maximum breakdown resistance of only 2300V at the temperature of 25 ℃, the humidity of 80 percent RH and the length of 1000 m. And before the cable is manufactured, the raw materials need to be baked at high temperature, so that moisture in the raw materials is removed, and the process difficulty is increased. And the maximum normal working high temperature of the cable after overload can reach 250 ℃, and the working time is short when the temperature is more than or equal to 700 ℃.
Disclosure of Invention
The invention aims to provide the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable aiming at the problems of high processing difficulty and insufficient impact resistance of the insulated cable manufactured by the traditional magnesium oxide, wherein the magnesium oxide is not required to be baked before the cable is manufactured by adopting the magnesium oxide, and the preparation method is simple and easy to implement; the maximum breakdown resistance of the cable prepared by the method can reach 3000V at the temperature of 25 ℃ and the humidity of 80% RH.
To achieve the above object, the present invention adoptsThe technical scheme is as follows: the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable comprises the following components in percentage by weight: MgO is more than or equal to 96 percent by weight; CaO is less than or equal to 1.0 percent by weight; fe2O3≤0.45％wt；Al2O3≤0.3％wt；SiO2≤2.0％wt；LOI≤0.2％wt。
Further, the magnesium oxide for the high-temperature-resistant, high-pressure-resistant and moisture-proof fireproof cable comprises the following components in percentage by weight: 96-98% wt of MgO; CaO 0.5-1.0 wt%; fe2O3 0.25-0.45％wt；Al2O30.1-0.3％wt；SiO2 0.5-2.0％wt；LOI 0-0.2％wt。
The invention also discloses a preparation method of the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable, which comprises the following steps:
step 1, firstly, placing the fused magnesia particles in a high-temperature rotary furnace, treating for 30-50 minutes at 800-1000 ℃, then removing magnetic substances in the fused magnesia through high-strength electromagnetic separation, and cooling for later use;
step 2, placing kaolin into a muffle type rotary kiln, and calcining at 700-900 ℃ for 0.5-1.5 hours; carrying out surface modification treatment on the calcined kaolin by using a surface modifier; obtaining superfine calcined kaolin with the d less than or equal to 0.05 mm;
step 3, carrying out ultrafine grinding on the raw enstatite raw material to obtain the crude enstatite with the mesh number of 800-1200 meshes, wherein the acid insoluble substance is more than or equal to 93.0 wt%, and the acid soluble iron (Fe is used as the Fe)2O3Calculated) is less than or equal to 0.20 percent by weight, the ignition loss (1200 ℃) is less than or equal to 3.00 percent by weight, the magnet absorption is less than or equal to 0.03 percent by weight, and the water content is less than or equal to 0.3 percent by weight;
step 4, baking the aluminum hydroxide powder at the temperature of 250-350 ℃ for 1-2 hours;
step 5, baking the zirconium silicate powder at the temperature of 750-850 ℃ for 1-3 hours;
step 6, mixing the fused magnesia obtained in the step 1, the superfine calcined kaolin obtained in the step 2, the original enstatite obtained in the step 3, the aluminum hydroxide obtained in the step 4 and the zirconium silicate obtained in the step 5 in a weight ratio of 100: 0.1-0.8:0.5-1: stirring uniformly in a container according to the proportion of 0.5-1.5: 1-3;
step 7, preparing the organic silicon resin, the organic silicon oil, the aluminate coupling agent and the solvent oil into a solution according to the volume ratio of 1-4:2-5:15-25: 70-90;
step 8, mixing the solution 90-110 obtained in the step 7: 3-5, adding the mixture into the container in the step 6, and uniformly stirring;
and 9, drying the mixed wet material obtained in the step 8 in a low-temperature rotary furnace at the temperature of 150-250 ℃ for 1-2 hours to prepare the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable.
Further, the electrofused magnesium oxide particles in the step 1 are obtained by the following method: crushing the fused magnesia raw material to 60-300 meshes by a crusher, and removing magnetic substances in the fused magnesia by high-strength electromagnetic separation; and treating the electrofused magnesium oxide obtained by the electromagnetic separation for 30-90 minutes by using shaping equipment to obtain the electrofused magnesium oxide with the sphericity of 1.
Further, the kaolin clay in the step 2 is obtained by the following method: crushing kaolin raw materials by a jaw crusher until d is less than or equal to 20 mm; then finely grading d by an air flow mill to be less than or equal to 0.05 mm.
Further, the modifier in the step 2 is solvent oil and organic silicone oil, and the mass ratio of the solvent oil (playing a role of a solvent) to the organic silicone oil (playing a role of surface modification) is 40-60: 40-60.
Further, the ratio of the kaolin to the modifier in the step 2 is 90-110:0.5-1.5, and the kaolin and the modifier are uniformly mixed and stirred for 20-50 minutes.
Further, the raw enstatite raw material in the step 3 is obtained by the following method: crushing the original enstatite by a hammer crusher until d is less than or equal to 10mm, and drying in a vertical drier at 400-700 ℃.
Further, the solvent oil in step 2 and step 7 is No. 120 solvent oil.
The invention also discloses application of the magnesium oxide for the high-temperature-resistant, high-pressure-resistant and moisture-proof fireproof cable in the field of cables. The weight ratio of the copper to the magnesium oxide is 2:0.5-2, preferably 2:1, and the specific addition amount of the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable is determined according to the type of the cable.
Compared with the prior art, the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable has the following advantages:
1) the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable does not need to be baked before being made (a certain amount of organic waterproof agent is added in the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable, so that the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable can play a role in normal insulation), the production process of the cable is effectively simplified, and the productivity and the working efficiency of the cable are improved.
2) The maximum breakdown resistance of the cable prepared by the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable can reach 3000V at the temperature of 25 ℃ and the humidity of 80 percent RH
3) The highest normal working temperature of the cable prepared by the magnesium oxide for the high-temperature and high-pressure resistant moisture-proof fireproof cable can reach 300 ℃ after overload, and the cable can continuously operate for 3 hours at the temperature close to the melting point of copper within 1083 ℃ in a short period.
4) The cable prepared by the magnesium oxide for the high-temperature and high-pressure resistant moistureproof cable keeps the integrity of the circuit, and provides valuable time for the safe evacuation of personnel.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses a high-temperature and high-pressure resistant moistureproof magnesium oxide for a fireproof cable, which comprises the following chemical components in a formula shown in table 1:
TABLE 1 chemical composition of magnesium oxide for high-temperature and high-pressure resistant moistureproof cable
The preparation method of the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable comprises the following steps:
1. crushing the fused magnesia into 60-270 meshes by a crusher;
2. carrying out high-strength electromagnetic separation on the fused magnesium oxide particles obtained in the step 1 to remove magnetic substances in the fused magnesium oxide;
3. and (3) treating the fused magnesia obtained in the step (2) for 60 minutes by using shaping equipment to obtain the fused magnesia with the sphericity close to 1.
4. Treating the fused magnesia particles obtained in the step 3 in a high-temperature rotary furnace at 900 ℃ for 40 minutes, removing magnetic substances in the magnesia by high-strength electromagnetic separation of the obtained fused magnesia, and cooling for later use;
5. crushing a kaolin raw material by a jaw crusher until d is less than or equal to 20 mm; then finely grading d by an airflow mill to be less than or equal to 0.05 mm;
6. directly feeding the 5 into a muffle type rotary kiln to calcine for 1 hour at 800 ℃;
7. carrying out surface modification treatment on the kaolin subjected to fine grading calcination and obtained in the step 6 by using a surface modifier; obtaining superfine calcined kaolin with the d less than or equal to 0.05 mm;
8. crushing the original enstatite raw material by a hammer crusher until d is less than or equal to 10mm, and drying the crushed enstatite raw material in a vertical dryer at 600 ℃;
9. ultra-fine grinding the crude enstatite obtained from step 8 to obtain 900-mesh and 1000-mesh crude enstatite, wherein the acid insoluble substance is not less than 93.0%, and acid soluble iron (Fe)2O3) Less than or equal to 0.20 percent, the ignition loss (1200 ℃) is less than or equal to 3.00 percent, the magnet absorption is less than or equal to 0.03 percent, and the water content is less than or equal to 0.3 percent;
10. baking the aluminum hydroxide powder at 300 ℃ for 1.5 hours;
11. baking zirconium silicate powder at 800 ℃ for 2 hours;
12. taking magnesium oxide obtained from 4, kaolin obtained from 7, protoenstatite obtained from 9, aluminum hydroxide obtained from 10 and zirconium silicate obtained from 11 according to the weight ratio of 100: 0.5:0.8: stirring uniformly in a container according to the proportion of 1: 2;
13. high-hydrogen-content organic silicon resin, high-hydrogen-content organic silicon oil, an aluminate coupling agent and solvent oil are mixed according to the volume ratio of 2: 3: preparing the solution according to the ratio of 20: 80;
14. adding the solution obtained in step 13 into a container of step 12, and uniformly stirring;
15. and (3) drying the mixed wet material obtained in the step (14) in a low-temperature rotary furnace at 200 ℃ for 1.5 hours to prepare the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable.
The detection method comprises the following steps: the magnesium oxide was used in the cable for detection. Such as a single core
The cable has a breakdown voltage of 2800V within 1 km and 2500V within 2 km within 10 minutes at a temperature of 25 ℃ and a humidity of 80% RH.
The properties of the high temperature and high pressure resistant moistureproof cable prepared from the magnesium oxide of this example are shown in table 2:
TABLE 2
| Length m of cable | 100 | 200 | 300 | 500 | 800 | 1000 |
| Breakdown voltage resistance V | 3500 | 3500 | 3200 | 3000 | 2900 | 2900 |
| Length m of cable | 1200 | 1500 | 1800 | 2000 | 2200 | 2500 |
| Breakdown voltage resistance V | 2900 | 2800 | 2800 | 2700 | 2700 | 2600 |
Example 2
The embodiment discloses a high-temperature and high-pressure resistant moistureproof magnesium oxide for a fireproof cable, which comprises the following chemical components in percentage by weight in table 3:
TABLE 3 chemical composition of magnesium oxide for high temperature and high pressure resistant moistureproof cable
The preparation method of the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable comprises the following steps:
1. crushing the fused magnesium oxide to 80-300 meshes by a crusher;
2. carrying out high-strength electromagnetic separation on the fused magnesium oxide particles obtained in the step 1 to remove magnetic substances in the fused magnesium oxide;
3. and (3) treating the fused magnesia obtained in the step (2) for 60 minutes by using shaping equipment to obtain the fused magnesia with the sphericity of 1.
4. Treating the fused magnesia particles obtained in the step 3 in a high-temperature rotary furnace at 1000 ℃ for 40 minutes, removing magnetic substances in the magnesia by high-strength electromagnetic separation, and cooling for later use;
5. crushing a kaolin raw material by a jaw crusher until d is less than or equal to 20 mm; then finely grading d by an airflow mill to be less than or equal to 0.05 mm;
6. directly feeding the 5 into a muffle type rotary kiln to calcine for 1 hour at 900 ℃;
7. carrying out surface modification treatment on the kaolin subjected to fine grading calcination and obtained in the step 6 by using a surface modifier; obtaining superfine calcined kaolin with the d less than or equal to 0.05 mm;
8. crushing the original enstatite raw material by a hammer crusher until d is less than or equal to 10mm, and drying the crushed enstatite raw material in a vertical dryer at 700 ℃;
9. ultra-fine grinding the crude enstatite obtained from step 8 to obtain 1000-1200 mesh powder, acid insoluble substance not less than 93.0%, and acid soluble iron (Fe)2O3) Less than or equal to 0.20 percent, the ignition loss (1200 ℃) is less than or equal to 3.00 percent, the magnet absorption is less than or equal to 0.03 percent, and the water content is less than or equal to 0.3 percent;
10. baking the aluminum hydroxide powder at 350 ℃ for 2 hours;
11. baking zirconium silicate powder at 850 ℃ for 3 hours;
12. uniformly stirring magnesium oxide obtained in step 4, kaolin obtained in step 7, protoenstatite obtained in step 9, aluminum hydroxide obtained in step 10 and zirconium silicate obtained in step 11 in a container according to the weight ratio of 100:0.1:0.5:0.5: 1;
13. preparing high hydrogen-containing organic silicon resin, high hydrogen-containing organic silicon oil, an aluminate coupling agent and solvent oil into a solution according to the volume ratio of 4:2:15: 70;
14. adding the solution obtained in step 13 into a container of step 12, and uniformly stirring;
15. and (3) drying the mixed wet material obtained in the step (14) in a low-temperature rotary furnace at 250 ℃ for 2 hours to prepare the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable.
The properties of the high temperature and high pressure resistant moistureproof cable prepared from the magnesium oxide of this example are shown in table 4:
TABLE 4
| Length m of cable | 100 | 200 | 300 | 500 | 800 | 1000 |
| Breakdown voltage resistance V | 3600 | 3550 | 3550 | 3500 | 3300 | 3200 |
| Length m of cable | 1200 | 1500 | 1800 | 2000 | 2200 | 2500 |
| Breakdown voltage resistance V | 3000 | 3000 | 2900 | 2800 | 2800 | 2700 |
Example 3
The embodiment discloses a high-temperature and high-pressure resistant moistureproof magnesium oxide for a fireproof cable, which comprises the following chemical components in percentage by weight in table 5:
TABLE 5 chemical composition of magnesium oxide for high temperature and high pressure resistant moistureproof cable
The preparation method of the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable comprises the following steps: 1. crushing the fused magnesium oxide to 60-250 meshes by a crusher;
2. carrying out high-strength electromagnetic separation on the fused magnesium oxide particles obtained in the step 1 to remove magnetic substances in the fused magnesium oxide;
3. and (3) treating the fused magnesia obtained in the step (2) for 90 minutes by using shaping equipment to obtain the fused magnesia with the sphericity of 1.
4. Treating the fused magnesia particles obtained in the step 3 in a high-temperature rotary furnace at 800 ℃ for 40 minutes, removing magnetic substances in the magnesia by high-strength electromagnetic separation, and cooling for later use;
5. crushing a kaolin raw material by a jaw crusher until d is less than or equal to 20 mm; then finely grading d by an airflow mill to be less than or equal to 0.05 mm;
6. directly feeding the 5 into a muffle type rotary kiln to calcine for 1 hour at 700 ℃;
7. carrying out surface modification treatment on the kaolin subjected to fine grading calcination and obtained in the step 6 by using a surface modifier; obtaining superfine calcined kaolin with the d less than or equal to 0.05 mm;
8. crushing the original enstatite raw material by a hammer crusher until d is less than or equal to 10mm, and drying the crushed enstatite raw material in a vertical dryer at 400-700 ℃;
9. ultra-fine grinding the crude enstatite obtained in step 8 to obtain 800-900 mesh powder, acid insoluble substance of 93.0% or more, and acid soluble iron (Fe)2O3) Less than or equal to 0.20 percent, the ignition loss (1200 ℃) is less than or equal to 3.00 percent, the magnet absorption is less than or equal to 0.03 percent, and the water content is less than or equal to 0.3 percent;
10. baking the aluminum hydroxide powder at 250 ℃ for 1 hour;
11. baking zirconium silicate powder at 850 ℃ for 1 hour;
12. uniformly stirring magnesium oxide obtained by 4, kaolin obtained by 7, protoenstatite obtained by 9, aluminum hydroxide obtained by 10 and zirconium silicate obtained by 11 in a container according to the weight ratio of 100:0.8:1:1.5: 3;
13. preparing high hydrogen-containing organic silicon resin, high hydrogen-containing organic silicon oil, an aluminate coupling agent and solvent oil into a solution according to the volume ratio of 1:5:25: 90;
14. adding the solution obtained in step 13 into a container of step 12, and uniformly stirring;
15. and (3) drying the mixed wet material obtained in the step (14) in a low-temperature rotary furnace at 150 ℃ for 1 hour to prepare the magnesium oxide for the high-temperature and high-pressure resistant moistureproof fireproof cable.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable is characterized by comprising the following components in percentage by weight: MgO is more than or equal to 96 percent by weight; CaO is less than or equal to 1.0 percent by weight; fe2O3≤0.45％wt；Al2O3≤0.3％wt；SiO2≤2.0％wt；LOI≤0.2％wt。
2. The magnesium oxide for the high-temperature-resistant, high-pressure-resistant and moisture-proof fireproof cable according to claim 1, which comprises the following components in percentage by weight: 96-98% wt of MgO; CaO 0.5-1.0 wt%; fe2O30.25-0.45％wt；Al2O3 0.1-0.3％wt；SiO2 0.5-2.0％wt；LOI 0-0.2％wt。
3. A preparation method of magnesium oxide for a high-temperature-resistant high-pressure-resistant moistureproof cable is characterized by comprising the following steps:
step 1, firstly, placing the fused magnesia particles in a high-temperature rotary furnace, treating for 30-50 minutes at 800-1000 ℃, then removing magnetic substances in the fused magnesia through high-strength electromagnetic separation, and cooling for later use;
step 2, placing kaolin into a muffle type rotary kiln, and calcining at 700-900 ℃ for 0.5-1.5 hours; carrying out surface modification treatment on the calcined kaolin by using a surface modifier; obtaining superfine calcined kaolin with the d less than or equal to 0.05 mm;
step 3, carrying out ultrafine grinding on the raw enstatite raw material to obtain the crude enstatite with the mesh number of 800-1200 meshes, wherein the acid insoluble substance is more than or equal to 93.0 wt%, and the acid soluble iron (Fe is used as the Fe)2O3Calculated) is less than or equal to 0.20 percent by weight, the ignition loss (1200 ℃) is less than or equal to 3.00 percent by weight, the magnet absorption is less than or equal to 0.03 percent by weight, and the water content is less than or equal to 0.3 percent by weight;
step 4, baking the aluminum hydroxide powder at the temperature of 250-350 ℃ for 1-2 hours;
step 5, baking the zirconium silicate powder at the temperature of 750-850 ℃ for 1-3 hours;
step 6, mixing the fused magnesia obtained in the step 1, the superfine calcined kaolin obtained in the step 2, the original enstatite obtained in the step 3, the aluminum hydroxide obtained in the step 4 and the zirconium silicate obtained in the step 5 in a weight ratio of 100: 0.1-0.8:0.5-1: stirring uniformly in a container according to the proportion of 0.5-1.5: 1-3;
step 7, preparing the organic silicon resin, the organic silicon oil, the aluminate coupling agent and the solvent oil into a solution according to the volume ratio of 1-4:2-5:15-25: 70-90;
step 8, mixing the solution 90-110 obtained in the step 7: 3-5, adding the mixture into the container in the step 6, and uniformly stirring;
and 9, drying the mixed wet material obtained in the step 8 in a low-temperature rotary furnace at the temperature of 150-250 ℃ for 1-2 hours to prepare the magnesium oxide for the high-temperature-resistant high-pressure-resistant moisture-proof fireproof cable.
4. The method for preparing the magnesium oxide for the high-temperature and high-pressure resistant moistureproof fireproof cable according to claim 3, wherein the electrically-fused magnesium oxide particles obtained in step 1 are prepared by the following steps: crushing the fused magnesia raw material to 60-300 meshes by a crusher, and removing magnetic substances in the fused magnesia by high-strength electromagnetic separation; and treating the electrofused magnesium oxide obtained by the electromagnetic separation for 30-90 minutes by using shaping equipment to obtain the electrofused magnesium oxide with the sphericity of 1.
5. The method for preparing the magnesium oxide for the high-temperature and high-pressure resistant moisture-proof fireproof cable according to claim 3, wherein the kaolin in the step 2 is obtained by the following method: crushing kaolin raw materials by a jaw crusher until d is less than or equal to 20 mm; then finely grading d by an air flow mill to be less than or equal to 0.05 mm.
6. The preparation method of the magnesium oxide for the high temperature and high pressure resistant moistureproof cable according to the claim 3, wherein the modifier in the step 2 is solvent oil and organic silicone oil, and the mass ratio of the solvent oil to the organic silicone oil is 40-60: 40-60.
7. The preparation method of the magnesium oxide for the high-temperature and high-pressure resistant moistureproof cable according to claim 3, wherein the ratio of the kaolin to the modifier in the step 2 is 90-110:0.5-1.5, and the magnesium oxide is uniformly mixed and stirred for 20-50 minutes.
8. The method for preparing the magnesium oxide for the high-temperature and high-pressure resistant moistureproof fireproof cable according to the claim 3, wherein the raw enstatite raw material in the step 3 is obtained by the following method: crushing the original enstatite by a hammer crusher until d is less than or equal to 10mm, and drying in a vertical drier at 400-700 ℃.
9. The method for preparing the magnesium oxide for the high temperature and high pressure resistant moisture-proof fireproof cable according to claim 3, wherein the solvent oil in the steps 2 and 7 is No. 120 solvent oil.
10. Use of the magnesium oxide for the high temperature and high pressure resistant moisture-proof fireproof cable according to claim 1 or 2 in the field of cables.
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