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Process for preparing magnesium oxide powder for fire-proof cable

A technology of magnesium oxide powder and fire-resistant cables, applied in the direction of magnesium oxide, etc., can solve the problems of not being able to significantly reduce the manufacturing cost of fire-resistant cables and high production costs, and achieve the effects of low market price, reduced production costs, and improved electrical properties

Inactive Publication Date: 2006-08-23
庄伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using the fused magnesia powder currently produced in China for the preparation of high and medium temperature electric heating tubes as raw materials, although it is also possible to process magnesia powder filling materials whose properties meet the requirements of fireproof cables, the production cost of this fused magnesia powder is high. Using it to produce magnesium oxide powder for fireproof cables is not much different from imported products, and the manufacturing cost of fireproof cables cannot be significantly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare magnesium oxide powder for fireproof cables according to the following steps:

[0018] (1) set the granularity to 200 purpose AI 2 o 3 Powder and SiO 2 Powder by weight ratio AI 2 o 3 : SiO 2 = 3:1 mixed, formulated as a modified additive;

[0019] (2) Get the white bark sand that magnesium oxide content is 95% and pulverize, and sieve into the material of +60 order, +120 order, +200 order and-250 order different particle size, the material of described different particle size is pressed successively by ( Weight ratio) 0.2%, 17.5%, 26% and 57.3% were weighed and mixed;

[0020] (3) the above-mentioned mixed material is deironed by a dry magnetic separator with a magnetic field strength of 15000GS;

[0021] (4) drying the above-mentioned material after iron removal at a temperature of 400° C. for 1.5 hours;

[0022] (5) Weigh 100 grams of the material in (4), add 1 gram of the modifying additive in (1) into it, and mix well to obtain magnesium oxide powde...

Embodiment 2

[0025] (1), (2), (3), (4) steps are identical with embodiment 1, only in the (5th) step, modifying additive blending amount is changed into 1.2 grams, makes magnesium oxide powder for fireproof cable.

[0026] After testing, the compacted density (TD) and flow rate (FR) of the magnesium oxide powder have no significant change with that of Example 1, and the electrical properties are: normal resistance 600MΩ, withstand voltage 2500V; thermal leakage current 0.10mA, resistance 4.0MΩ, Withstand voltage 1800V. All indicators meet the requirements of fireproof cables.

Embodiment 3

[0028] (1), (2), (3), (4) steps are identical with embodiment 1, only in the (5) step, modifying additive blending amount is changed into 2 grams, makes magnesium oxide powder for fireproof cable.

[0029] After testing, the compacted density (TD) and flow rate (FR) of the magnesium oxide powder have no significant change with that of Example 1, and the electrical properties are: normal resistance 530MΩ, withstand voltage 2500V; thermal state leakage current 0.13mA, resistance 3.0MΩ, Withstand voltage 1500V. All indicators meet the requirements of fireproof cables.

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Abstract

The preparation process of magnesium oxide powder for fire-proof cable includes the following steps: 1. mixing Ai2O3 powder and SiO2 powder of granularity not lower than 200 mesh and in the weight ratio of 3 to compound modifying additive; 2. crushing and sieving white sand with magnesia content not lower than 95 %, and mixing in required granularity; 3. passing the step 2 obtained material through a dry magnetic separator to eliminate iron; 4. stoving the iron-eliminated material at 400 deg.c for 1-2 hr; and 5. adding the modifying additive in 1-2 % into the stoved material and mixing homogeneously to obtain the magnesium oxide powder for fire-proof cable.

Description

1. Technical field [0001] The invention relates to a magnesium oxide electrical insulating material, in particular to a preparation method of a magnesium oxide powder filling material for fireproof cables. 2. Background technology [0002] In order to prevent the power supply cables used in some occasions from being burned quickly in the event of a fire around them, so-called fireproof cables have appeared in the world in recent years. The cable utilizes the characteristics of high temperature resistance of magnesium oxide and good electrical insulation at high temperature. Magnesium oxide powder is used as the filling material between the cable conductors to fix the cable conductors, insulate and resist high temperatures caused by fire. effect. [0003] At present, my country's production equipment for making fireproof cables is still imported from abroad, and the magnesium oxide powder filling materials used in it are also imported. Due to the high price of magnesium oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02
Inventor 庄伟
Owner 庄伟