Recycling and re-preparation method of silicon-steel level magnesium oxide

A magnesia and silicon steel grade technology, applied in the direction of magnesia, etc., can solve the problems of low purity, low content of silicon steel grade magnesia magnesia, uneven particle size, etc., and achieve the effect of simple process flow, increased bulkiness, and simple operation.

Inactive Publication Date: 2016-05-04
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a method for reclaiming and repreparing silicon steel grade magnesia. The method for reclaiming and repreparing silicon steel grade mag

Method used

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  • Recycling and re-preparation method of silicon-steel level magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. The magnesia waste used for silicon steel was calcined at a high temperature in a 600°C tube furnace fed with oxygen to remove excess carbon to obtain a gray-white waste sample.

[0020] b. Add the off-white waste obtained in a. to regenerated hydrochloric acid with a mass fraction of 16%, the ratio of waste to regenerated acid is 1g:9ml, dissolve and react in a water bath at 60°C for 4 hours, and filter to obtain yellow Green crude Mg 2+ solution.

[0021] c. The crude Mg obtained by b 2+ Crude Mg 2+ Solution: The volume ratio of hydrogen peroxide is 5:1. After adding hydrogen peroxide, the solution changes from yellow-green to yellow crude Mg 2+ solution, let it stand for 1h.

[0022] d. Yellow crude Mg obtained from c 2+ In the solution solution, add ammonia water dropwise to control the pH value to 8.5, so that the iron ions can completely generate Fe(OH) 3 Precipitation, but magnesium ions do not precipitate, and the filtrate obtained by filtration is hig...

Embodiment 2

[0026] a. The magnesia waste used for silicon steel was calcined at a high temperature in a 600°C tube furnace fed with oxygen to remove excess carbon to obtain a gray-white waste sample.

[0027] b. Add the off-white waste obtained in a. to regenerated hydrochloric acid with a mass fraction of 16%, the ratio of waste to regenerated acid is 1g:9ml, dissolve and react in a water bath at 60°C for 4 hours, and filter to obtain yellow Green crude Mg 2+ solution.

[0028] c. The crude Mg obtained by b 2+ Crude Mg 2+ Solution: The volume ratio of hydrogen peroxide is 5-1. After adding hydrogen peroxide, the solution changes from yellow-green to yellow crude Mg 2+ solution, let it stand for 1h.

[0029] d. Yellow crude Mg obtained from c 2+ In the solution solution, ammonia water is added dropwise, and the pH value is controlled to be 8.5, so that iron ions completely generate Fe(OH)3 precipitation, while magnesium ions do not precipitate, and the filtrate obtained by filtratio...

Embodiment 3

[0033]a. The magnesia waste used for silicon steel was calcined at a high temperature in a 600°C tube furnace fed with oxygen to remove excess carbon to obtain a gray-white waste sample.

[0034] b. Add the off-white waste obtained in a. to regenerated hydrochloric acid with a mass fraction of 16%, the ratio of waste to regenerated acid is 1g:9ml, dissolve and react in a water bath at 60°C for 4 hours, and filter to obtain yellow Green crude Mg 2+ solution.

[0035] c. The crude Mg obtained by b 2+ Crude Mg 2+ Solution: The volume ratio of hydrogen peroxide is 5-1. After adding hydrogen peroxide, the solution changes from yellow-green to yellow crude Mg 2+ solution, let it stand for 1h.

[0036] d. Yellow crude Mg obtained from c 2+ In the solution solution, add ammonia water dropwise to control the pH value to 8.5, so that iron ions can completely form Fe(OH)3 precipitation, while magnesium ions do not precipitate, and the filtrate obtained by filtration is high-purity ...

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Abstract

The invention discloses a recycling and re-preparation method of silicon-steel level magnesium oxide. The method comprises the following steps: by taking magnesium oxide, a residual waste coating material after silicon steel production, as a raw material, carrying out purification treatment operations of calcination, acidolysis, iron and silicon removal, acidolysis with hydrochloric acid, and the like to obtain a high-purity magnesium chloride solution; by taking the high-purity magnesium chloride solution as a reaction solution, adding ammonium hydrogen carbonate and ammonia water as two precipitants, introducing an organic surfactant at the same time, and carrying out preparation at 40-80 DEG C to obtain a precursor, namely basic magnesium carbonate Mg2(OH)2CO3; and finally, carrying out washing, suction filtration, drying, crushing, and air blowing method calcination to prepare silicon-steel level magnesium oxide. According to the method disclosed by the invention, the wastes which are generated during production of silicon steel and contain a large amount of magnesium oxide are recycled, and high-quality silicon-steel level magnesium oxide with a high specific area and uniform particle size distribution can be prepared by virtue of the processes of purification, two-phase precipitant method precursor preparation, air blowing method calcination and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a silicon steel grade magnesium oxide, in particular to a recovery and repreparation method for silicon steel grade magnesium oxide. Background technique [0002] Silicon steel grade magnesia is a magnesia coating material used to prepare oriented silicon steel sheets. It is a high value-added magnesia product and is mainly used as a release agent in the high temperature annealing stage of the production process of oriented silicon steel sheets. , dephosphorization, and desulfurization agents, and at the same time react with silicon on the surface of silicon steel to form an excellent insulating film. Silicon steel grade magnesium oxide can also be used in the manufacture of refractory crucibles, precision ceramics, special polishing agents, and can also be used in aerospace industry, electronics industry, etc. With the advancement of science and technology, the quality requiremen...

Claims

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Application Information

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IPC IPC(8): C01F5/02
CPCC01F5/02C01P2002/72C01P2004/03C01P2004/80C01P2006/12
Inventor 房永征朱付萍丁艳花黄成杰张娜
Owner SHANGHAI INST OF TECH
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