Method for preparing high-viscosity silicon-steel grade magnesium oxide

A technology of magnesium oxide and silicon steel grade, applied in magnesium oxide and other directions, can solve the problems of low magnesium content in products, low utilization rate of raw materials, and high production costs, and achieve the effects of ensuring stability, rational design, and improving calcination and pulverization processes.

Active Publication Date: 2009-10-21
上海实业振泰化工有限公司
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Predecessors have summed up a lot of methods for preparing magnesium oxide from brine, such as brine-ammonia method, brine-alkali method, brine-ammonium bicarbonate method, etc. Although these processes are simple,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing high-viscosity silicon-steel grade magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example

[0022] Add 6m to the reactor 3 The molar concentration of the volume is 2.0mol / L (as Mg 2+ ) brine, add 200kg of ammonium bicarbonate under normal temperature stirring state, add 1m 3 Carbonated ammonia water (carbonization degree 40-60%), then add 100kg of ammonium bicarbonate, keep stirring and raise the temperature to 40-50°C, the reaction time is 1.5 hours; separate and dry to obtain magnesium compound; calcined at 780°C for 2 hours , to obtain high-activity magnesium oxide with a magnesium oxide content of more than 85%; put high-activity magnesium oxide into pure water at 80-90°C for hydration, stir for 1.5 hours, then separate the solid-liquid mixture, wash and dry to obtain magnesium hydroxide, at 980°C Calcining at low temperature for 4 hours to obtain magnesia particles, crushing and grading and packaging to obtain high-viscosity silicon steel magnesia.

[0023] Table 1

[0024] MgO content

[0025] The production of silicon steel she...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing a high-viscosity silicon-steel grade magnesium compound. The method is characterized in that brine, ammonium hydrogen carbonate and carbonated aqueous ammonia are added into a reactor respectively, and react to obtain a magnesium compound; the magnesium compound is calcined to obtain high activity magnesium oxide; the high activity magnesium oxide is hydrated under a certain condition; magnesium hydrate is dried and calcined under a certain condition to obtain high-viscosity silicon-steel grade magnesium; and the high-viscosity silicon-steel grade magnesium are crushed and packaged in grade. The performance of the high-viscosity silicon-steel grade magnesium compound produced by the method can be comparable with a compact forsterite type insulating film formed by reacting the conventional silicon-steel magnesium oxide and silicon dioxide on the surface of a grain-oriented silicon steel sheet. The method can solve the problem that the prior silicon-steel grade magnesium oxide has lower viscosity (20-50 cp), and cannot adapt to the production requirement of partial silicon-steel sheet factories on the magnesium oxide with over 80 cp viscosity. The product prepared by the method maintains the content of the MgO in the product over 98 percent, and has hydration ratio and screening characteristic which still can meet the requirement of producing the silicon-steel sheet.

Description

technical field [0001] The invention relates to a preparation method of a magnesium compound, in particular to a preparation method of high-viscosity silicon steel grade magnesium oxide. It belongs to the field of silicon steel grade magnesium oxide. Background technique [0002] With the continuous advancement of science and technology and the continuous development of silicon steel sheet production technology, different silicon steel sheet factories have different viscosity requirements for magnesium oxide required for the production of silicon steel sheet. Domestic customers, such as Wuhan Iron and Steel Company (WISCO), require silicon steel grade magnesium oxide to have a viscosity below 50cp, but some foreign customers require silicon steel grade magnesium oxide to have a higher viscosity to adapt to their different technological processes from domestic customers; traditional high viscosity magnesium oxide The magnesium content is low, the hydration rate is high, and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01F5/02
Inventor 王贵仁傅涛徐艳霞王讯华
Owner 上海实业振泰化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap