Preparation method of macrocrystalline magnesia with low silicon dioxide content

A technology of silicon dioxide and crystalline magnesium, applied in flotation, solid separation and other directions, can solve the problems of high silicon dioxide, low product yield, affecting the high temperature erosion resistance of magnesia, and reduce the silicon dioxide content , the effect of improving the yield of large crystals

Inactive Publication Date: 2020-12-18
LIAONING DONGHE NEW MATERIAL CO LTD
View PDF11 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the large crystalline magnesia on the market generally has the problem of high silica, which seriously affects its anti-corrosion performance.
According to statistics, the products produced by large crystalline magnesia manufacturers in China are generally high in silica, for example, 97.5% of large crystalline magnesia contains more than 0.6% silica, which greatly affects the high temperature corrosion resistance of magnesia
In addition, the yield rate of more than 97.5% of the products in the production process is very low

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
  • Preparation method of macrocrystalline magnesia with low silicon dioxide content
  • Preparation method of macrocrystalline magnesia with low silicon dioxide content
  • Preparation method of macrocrystalline magnesia with low silicon dioxide content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of the large crystalline magnesia of the low silicon dioxide content of the present embodiment may further comprise the steps:

[0043] (1) selection: using low-grade magnesite as raw material, select magnesite with a magnesium oxide content of 40%;

[0044] (2) Cleaning: the magnesite after step (1) is selected, is cleaned, and the mud and fine-grained minerals on its surface are removed, and stand-by;

[0045] (3) Refining: the magnesite after step (2) is cleaned is refined, and the refining process is divided into six steps. The first step is to crush the above-mentioned magnesite, and the second step is to crush the crushed magnesite. Washing with water, the third step is to grind the washed magnesite, the fourth step is to add water to the ground magnesite to make raw ore pulp, the fifth step is to deslim the raw ore pulp, and the sixth step is to remove the Flotation is carried out on the raw ore pulp after mud to obtain concentrate powder ...

Embodiment 2

[0096]The large crystalline magnesia prepared in Example 2 and the magnesia prepared in Comparative Examples 1-3 were selected respectively, and tested with reference to QB / T 002-2016.

[0097] Table 1 Comparison of test parameters

[0098]

[0099] Compared with Comparative Examples 1-3, the large crystalline magnesia prepared in Example 1 of the present invention has good performance advantages, particle volume density, magnesium oxide content, silicon dioxide content, calcium oxide content, iron oxide content, aluminum oxide content The test parameters such as content and yield all reflect significant differences, and it is high-quality large crystal magnesia. Specifically, the present invention makes full use of the basic conditions such as magnesite tailings flotation purification and new suspension furnaces previously applied by the company, and researches and develops volume density up to 3.5g / cm 3 The above-mentioned large crystal magnesia with low silicon dioxide ...

Embodiment 3

[0101] Combined with the test results of Example 2, the large crystal magnesia prepared in Example 1 was selected for SEM and XRD tests. For the specific method, refer to the following literature (Wang Chunxin. The influence of smelting process on the structure and properties of fused magnesia and magnesia-aluminum spinel [D].), combined with SEM and XRD for analysis.

[0102] Such as figure 1 with figure 2 As shown, the large crystalline magnesia prepared by the present invention has its main crystal phase as a trigonal rhombohedron without impurity peaks, indicating that the large crystalline magnesia has a high purity and almost no impurity mineral phase, which is comparable to the high-purity magnesia obtained by chemical analysis. They are consistent with each other, and the diffraction peaks are stronger at the same time, indicating that the crystal form in magnesia is relatively complete and the crystallinity is higher.

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of macrocrystalline magnesia with low silicon dioxide content, and belongs to the technical field of mineral resource processing. The method comprises thefollowing steps: (1) fine selection: taking low-grade magnesite as a raw material, and finely selecting magnesite with the magnesium oxide content of 40%-45%; (2) cleaning: cleaning magnesite; (3) refining: refining the magnesite; (4) roasting: feeding the concentrate powder into a rotary kiln or a fluidized bed furnace for roasting, and cooling to room temperature to obtain light calcined magnesia; (5) dry pressing: feeding the light calcined magnesia into a ball press machine for dry pressing to obtain balls; and (6) electric melting: feeding the spheres prepared in the step (5) into an electric arc furnace for electric melting, and carrying out heat preservation, cooling and crystallization. The prepared macrocrystalline magnesia has good performance advantages, the test parameters suchas the particle volume density, the magnesium oxide content, the silicon dioxide content, the calcium oxide content, the iron oxide content, the aluminum oxide content and the yield show significantdifferences, and the macrocrystalline magnesia is high-quality macrocrystalline magnesia.

Description

technical field [0001] The invention belongs to the technical field of mineral resource processing, and in particular relates to a method for preparing large crystal magnesia with low silicon dioxide content. Background technique [0002] Large crystalline magnesia has good corrosion resistance due to its coarse grain size. It is one of the main export magnesia refractory materials in my country. It is mainly used in metallurgy, aerospace and other industrial fields. The main raw material of refractory products is also an excellent high temperature insulating filling material. The market demand for large crystalline fused magnesium is very large, especially in foreign markets, and it is exported to developed countries such as Russia, the United States, Japan, Germany and South Korea every year, in exchange for a large amount of foreign exchange for our country. [0003] However, in recent years, as the international market has higher and higher requirements for large crystal...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/05C04B2/10B03D1/14B03D103/04
CPCC04B35/05C04B2/10B03D1/14B03D2203/04C01P2006/10C01P2006/80
Inventor 毕胜民毕一明董宝华孙希忠赵权秦楠钟刚王飞王耶贾明鑫赵蔚
Owner LIAONING DONGHE NEW MATERIAL CO LTD
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