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Method for preparing special magnesium borate for oriented silicon steel

A technology of oriented silicon steel and magnesium borate, applied in the field of oriented silicon steel sheet manufacturing, can solve problems such as poor adhesion, poor electromagnetic properties, and poor dispersion properties

Active Publication Date: 2012-05-09
山西银圣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a preparation method of special magnesium borate for oriented silicon steel in order to solve the problems of poor adhesion, poor dispersion and poor electromagnetic properties in the actual application of existing boron additive products in the manufacture of oriented silicon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing special magnesium borate for oriented silicon steel, comprising the following process steps: (1) Mixing of raw materials: input magnesium bicarbonate aqueous solution containing 7.0g / L magnesium oxide into a reaction kettle, start stirring, and then mix boric acid with magnesium oxide The weight ratio of 1.8:1 is poured into the reactor, the stirring speed is 120 revolutions per minute, the temperature of the reactor is 5°C, and the stirring time is 1.0h to obtain the raw material mixture; (2) Precipitation: the raw material mixture is Precipitation treatment, the precipitation time is 30 minutes; (3) Pyrolysis: input the precipitated mixed solution into the pyrolysis tank, add finished magnesium borate seed crystals accounting for 2% of the total weight of the raw material mixed solution, and then add 2% of the total weight of the raw material mixed solution 0.2% KH-570 silane coupling agent by weight, using steam at 95°C for 15 minutes to produce...

Embodiment 2

[0040] A preparation method of special magnesium borate for oriented silicon steel, comprising the following process steps: (1) Mixing of raw materials: input magnesium bicarbonate aqueous solution containing 7.5g / L magnesium oxide into the reaction kettle, start stirring, and then mix boric acid with magnesium oxide The weight ratio of 2.0:1 is poured into the reactor, the stirring speed is 140 revolutions per minute, the temperature of the reactor is 30°C, and the stirring time is 2.0h to obtain the raw material mixture; (2) Precipitation: the raw material mixture is Precipitation treatment, the precipitation time is 60 minutes; (3) Pyrolysis: input the precipitated mixed solution into the pyrolysis tank, add finished magnesium borate seed crystals accounting for 5% of the total weight of the raw material mixed solution, and then add 5% of the total weight of the raw material mixed solution 0.5% KH-570 silane coupling agent by weight, using steam at 100°C for 20 minutes to pr...

Embodiment 3

[0042] A method for preparing special magnesium borate for oriented silicon steel, comprising the following process steps: (1) Mixing raw materials: input magnesium bicarbonate aqueous solution containing 7.3g / L magnesium oxide into the reaction kettle, start stirring, and then mix boric acid with magnesium oxide The weight ratio of 1.9:1 is poured into the reactor, the stirring speed is 120~140 revolutions per minute, the temperature of the reactor is 15°C, and the stirring time is 1.5h to obtain the raw material mixture; (2) Precipitation: mix the raw materials (3) Pyrolysis: input the precipitated mixed solution into the pyrolysis tank, add finished magnesium borate seed crystals accounting for 3.5% of the total weight of the raw material mixed solution, and then add the raw material mixed solution The total weight of the liquid is 0.35% KH-570 silane coupling agent, using steam at 98°C for 17 minutes to produce a mixture of nano-sized magnesium carbonate and metaboric acid;...

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Abstract

The invention relates to the field of oriented silicon steel plate manufacture, in particular to a method for preparing special magnesium borate for oriented silicon steel. The method solves the problems of poor adhesion, dispersibility and electromagnetic performance and the like of the conventional boron aid. The method comprises the following steps of: (1) pouring aqueous solution of magnesiumbicarbonate and boric acid in a ratio into a reaction kettle; (2) performing sedimentation treatment on the mixed solution; (3) then conveying the sediment into a pyrolysis tank, adding finished magnesium borate crystal seeds and silane coupling agent into the pyrolysis tank, and producing a mixture of nano magnesium carbonate and metaboric acid by using a liquid phase precipitation method; (4) filter-pressing the pyrolysis product to obtain filter cakes; (5) treating the filter cakes in a high-temperature crystal oven to form nano magnesium borate powder with complete crystal; and (6) grading the material discharged out of the high-temperature crystal oven with jet milling to obtain a screened substance of less than or equal to 320 meshes. All indexes of the special magnesium borate are superior to that of the primary product, and in particular, the adhesion, dispersibility and electromagnetic performance are remarkably improved, and the quality of the oriented silicon steel plate isimproved; and the method has the advantages of simple production process, lower cost and no three-waste pollution.

Description

technical field [0001] The invention relates to the field of manufacturing oriented silicon steel sheets, in particular to a method for preparing special magnesium borate for oriented silicon steel. Background technique [0002] During the manufacturing process of oriented silicon steel sheets, in order to increase the synthesis reaction speed of silicon dioxide and silicon steel magnesia in the steel sheet, improve the adhesion and electromagnetic properties of the underlying insulating film layer of magnesium silicate. At present, manufacturers of oriented silicon steel sheets at home and abroad generally use boron additives. Boron ions can inhibit the conduction of iron atoms in oriented silicon steel sheets, thereby improving the insulation resistance and electromagnetic properties of silicon steel sheets, and can effectively reduce the oxidation of silicon dioxide and silicon steel grades in silicon steel sheets. The melting point of magnesium silicate insulation film s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/12
Inventor 白世海宗巍范太其张乃英
Owner 山西银圣科技有限公司
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