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Preparation of magnesia crystal whisker

A technology of magnesium oxide whiskers and magnesium carbonate whiskers, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of restricting industrial production and application, unfavorable large-scale production methods, and high equipment requirements. Achieve the effect of promoting high-efficiency comprehensive utilization, low production cost, and good crystal development

Inactive Publication Date: 2009-08-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the current preparation methods of magnesium oxide whiskers, some have high requirements for equipment, some have complicated processes, and some have high raw material costs, which are not conducive to industrialized large-scale production methods, which greatly limit their industrialized production and application.

Method used

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  • Preparation of magnesia crystal whisker
  • Preparation of magnesia crystal whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The discarded magnesite powder ore (particle size range: 0.001-40 mm) was used in Dashiqiao, Liaoning, and its chemical composition is shown in Table 1.

[0030] Table 1 Physical and chemical indicators of magnesite powder ore for implementation (%)

[0031]

[0032] ①Calcination. The magnesite raw material is calcined in a reverberatory furnace at 850°C for 2 hours and lightly calcined to obtain lightly calcined magnesia.

[0033] ② cooling. The lightly burned minerals are naturally cooled to 100°C in the air.

[0034] ③ Hydration. After the cooled light-burned magnesia is crushed in a crusher, it is added to room temperature water 8 times the volume of the mineral, mixed, and finely ground in a ball mill to below 200 mesh.

[0035] ④ Carbonization. ③The slurry after ball milling is diluted with clear water in the water tank, so that the mass ratio of the diluted mineral water is 50kg / 1000L water. While stirring, blow CO into the slurry at a flow rate of 40L / m...

Embodiment 2

[0042] Liaoning Dandong brucite was used as raw material, and its chemical composition is shown in Table 2.

[0043] Table 2 Implementation of physical and chemical indicators of brucite (%)

[0044]

[0045] ①Calcination. The magnesite raw material is calcined in a reverberatory furnace at 550°C for 2 hours and lightly calcined to obtain lightly calcined magnesia.

[0046] ② cooling. The lightly burned minerals are naturally cooled to 100°C in the air.

[0047] ③ Hydration. After the cooled light-burned magnesia is crushed in a crusher, it is mixed with room temperature water 8 times the volume of the mineral, and finely ground in a ball mill to below 200 mesh.

[0048] ④ Carbonization. (3) The ball-milled slurry is further diluted with water in a water tank, so that the mass ratio of the diluted mineral water is 50kg / 1000L water. While stirring, blow CO into the water slurry at a flow rate of 45L / min (relative to 1000L solution). 2 Gas for 8 hours to make magnesium...

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Abstract

The invention relates to the field of inorganic and non-metal material preparation, in particular discloses a method of using magnesite or brucite as raw material to prepare magnesia whiskers by technologies of calcinations, fine grinding, hydration, carbonization, solid-liquid separation, dilution, pyrolysis, filtration, drying and calcination. The method comprises the following steps: adding 0.1 percent to 2.0 percent of soluble magnesium salt to high-magnesian water with the concentration of 3-100kg / 1000L to be pyrolyzed at a temperature of 40 DEG C to 80 DEG C under the stirring intensity of 50-500 round / min; firstly, preparing precursor magnesium carbonate whiskers; further calcining the whiskers at a temperature of 500 DEG C to 800 DEG C to obtain magnesia whisker products which have favorable crystallization growth, high purity and slenderness ratio and good dispersion and can be applied to the fields of material, chemical engineering, machinery, and the like, and the precursor magnesium carbonate whiskers can be also applied to the fields of material, chemical engineering, and the like and the preparation of magnesium hydrate, bitter salt, magnesium chloride, magnesium nitrate and other magnesium salt products. The method has simple technology, little investment and low production cost, has no pollution in a production process and can utilize various grades of magnesite and brucite lump ores and powder (tailing) to prepare the magnesia whiskers.

Description

Technical field: [0001] The invention relates to the technical field of inorganic non-metallic powder preparation, in particular to a preparation method for preparing magnesium oxide whiskers by utilizing magnesite resources such as magnesite or brucite. Background technique: [0002] my country is rich in magnesia resources (mainly magnesite and brucite), and is an important production base for refractory materials. However, the mining and utilization of magnesite resources in my country has long had the problem of low utilization rate of low-grade ore and fine ore, which seriously affects the efficient and comprehensive utilization of magnesite resources. On the other hand, the current utilization of magnesia resources is mainly used to produce magnesia refractory materials, and there has always been a problem of low added value of products. Efficient and comprehensive utilization of magnesium resources and development of high value-added products are important developmen...

Claims

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Application Information

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IPC IPC(8): C30B29/16C30B29/62C01B5/02
Inventor 陈敏王楠李月圆
Owner NORTHEASTERN UNIV
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