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Method for preparing ultra-fine magnesium oxide with dolostone

A technology of magnesium oxide and magnesium chloride, which is applied in the field of compound preparation, can solve problems such as difficult industrial production, easy agglomeration of particles, and cumbersome process, and achieve the effects of uniform size, simple preparation process, and wide application prospects

Inactive Publication Date: 2008-12-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have disadvantages such as high cost, difficulty in industrial production, easy agglomeration and unevenness of particles, and cumbersome process.

Method used

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Experimental program
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Effect test

specific Embodiment approach

[0013] The invention provides a method for preparing superfine magnesium oxide from dolomite, the preparation process is simple and the production cost is low. The specific implementation method comprises the following steps:

[0014] The first step of preparation is to fully crush the dolomite and calcinate it in a furnace at 900-1600°C for 3-8 hours. During the calcining process, the dolomite gradually removes CO 2 , forming calcined dolomite powder with the general chemical structure formula (Mg, Ca)O, which contains Fe 2 o 3 、Al 2 o 3 and other secondary components.

[0015] MgCa(CO 3 ) 2 →MgO+CaO+2CO 2 ↑

[0016] Then take 100 grams of calcined products and add them to 500-2000mL deionized water at 40-90°C for digestion. MgO and CaO are digested into magnesium hydroxide and calcium hydroxide particles suspended in the liquid; the insoluble residue at the bottom is removed by siphon method, Add 50-200 grams of magnesium chloride and 2-10 grams of dispersant to the...

Embodiment 1

[0022] 1) The dolomite is fully crushed and calcined in a furnace at 900°C for 8 hours to obtain a dolomite calcined product whose general chemical structure is (Mg, Ca)O;

[0023] 2) Add 100 grams of calcined dolomite products to 500 mL of deionized water at 40°C for digestion, remove residues, add 50 grams of MgCl 2 , 2 grams of polyethylene glycol, stirred and reacted for 0.5 hour to obtain a suspension;

[0024] 3) The suspension is centrifuged, the supernatant is concentrated and dried to obtain anhydrous calcium chloride; the centrifuged solid product is dried at 60°C, calcined in a furnace at 500°C for 8 hours, cooled and ground to obtain Ultrafine Magnesium Oxide.

Embodiment 2

[0026] 1) The dolomite is fully crushed and calcined in a furnace at 1600°C for 3 hours to obtain a dolomite calcined product whose general chemical structure is (Mg, Ca)O;

[0027] 2) Add 100 grams of calcined dolomite products to 2000 mL of deionized water at 90°C for digestion, remove residues, and add 200 grams of MgCl 2 ·6H 2 0, 10 grams of sodium dodecylbenzenesulfonate, stirred and reacted for 3 hours to obtain a suspension;

[0028] 3) The suspension is centrifuged, the supernatant is concentrated and dried to obtain anhydrous calcium chloride; the centrifuged solid product is dried at 120°C, calcined in a furnace at 800°C for 2 hours, cooled and ground to obtain Ultrafine Magnesium Oxide.

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Abstract

The invention discloses a method for preparing superfine magnesia from dolomites. Dolomites are quite abundantly deposited in China, and generic chemical formula of main components of the dolomites is MgCa(CO3)2. The method comprises two simple steps that: firstly, ground dolomites are calcinated at a high temperature to obtain dolomite calcinated powder; and secondly, the dolomite calcinated powder is subjected to water treatment, calcium-magnesium separation and secondary burning to obtain superfine magnesia powder with activity. The nano magnesia has wide application prospect in fields such as neutralizers, fire retardants, adsorbents and fillers, etc. The method for preparing the superfine magnesia provided by the invention has the advantages of simple technological process, less equipment investment and low operational cost, capability of preparing magnesia with a purity of more than 92 percent as well as producing industrial by-products of calcium chloride with economic value, so that the method is worthy of promotion and application.

Description

technical field [0001] The invention relates to a method for preparing compounds, in particular to a method for preparing ultrafine magnesium oxide from dolomite. Background technique [0002] Dolomite is an important calcium and magnesium resource on the earth, and it has extremely rich reserves in my country. However, the development and utilization of dolomite in my country is very low at present, and most mines only sell raw ore. [0003] Ultrafine magnesium oxide has broad application prospects in the fields of flame retardants, neutralizers, adsorbents, catalysts, and antibacterial materials. In the field of neutralizers, magnesium oxide, as the third alkali widely used in the environmental field, has strong neutralization ability and buffering properties. It can absorb various metal ions while neutralizing acidic liquids. It is an excellent performance Alkali agents are increasingly popular in the environmental protection sector. Hydration of ultrafine magnesium ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
CPCC04B2/102
Inventor 叶瑛陈雪刚夏枚生吕双双李秀悌姚志通张路
Owner ZHEJIANG UNIV
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