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Method for preparing magnesium oxide or magnesium oxide and fibrous magnesium hydroxide from magnesite

A magnesium hydroxide and magnesium oxide technology, applied in the direction of magnesium hydroxide, magnesium oxide, etc., can solve the problems of calcium carbonate entering impurities, high leaching temperature, and not widely used, and achieve low equipment requirements, less waste, and reduced production cost effect

Inactive Publication Date: 2017-05-31
张旭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method has the disadvantages of high leaching temperature, long time, and high energy consumption, and some processes have calcium carbonate entering impurities, so it is not widely used at present.

Method used

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  • Method for preparing magnesium oxide or magnesium oxide and fibrous magnesium hydroxide from magnesite
  • Method for preparing magnesium oxide or magnesium oxide and fibrous magnesium hydroxide from magnesite
  • Method for preparing magnesium oxide or magnesium oxide and fibrous magnesium hydroxide from magnesite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 Preparation of high-purity magnesium oxide and fibrous magnesium hydroxide with magnesite

[0058] Experiment 1

[0059] Operate according to the following steps (the process flow diagram of the method is as follows figure 1 shown):

[0060] 1) Use the magnesite in Table 1 as the raw material, calcinate at 1100°C for 0.5h to obtain lightly calcined magnesium powder, and then crush and sieve to obtain calcined magnesium oxide powder with a particle size of -200 mesh.

[0061] 2) Take 2.4kg of solid ammonium sulfate, add water to fully dissolve it, configure the solution volume to 6.1L, then add 970g of light-burned magnesium powder (the solid-liquid ratio of light-burned magnesium powder to ammonium sulfate solution is 159g / L, NH 4 + :MgO molar ratio is 1.7:1), join in the reaction kettle, adjust the water bath temperature 60 ℃, keep stirring during the reaction process, the rotating speed is 300rpm, and adjust the negative pressure to relative vacuum degree...

Embodiment 2

[0073] Example 2 Preparation of high-purity magnesium oxide and fibrous magnesium hydroxide with magnesite

[0074] Experiment 1

[0075] Follow the steps below:

[0076] 1) Use the magnesite in Table 1 as the raw material, calcinate at 700°C for 2 hours to obtain lightly burned magnesium powder, and then crush and sieve to obtain calcined magnesium oxide powder with a particle size of -200 mesh.

[0077] 2) Take 5.4kg of solid ammonium nitrate and 1.48kg of magnesium sulfate heptahydrate, add water to fully dissolve, configure the solution volume to 10L, then add 1200g of lightly burned magnesium powder (solid-liquid ratio is 120g / L, NH 4 + :MgO is 2.5:1), put it into the reaction kettle, adjust the temperature of the water bath to 95°C, keep stirring at a speed of 120rpm during the reaction, and adjust the negative pressure to a relative vacuum of -0.098Mp, absorb the steamed ammonia with water, and leaching After 1 h, a solid-liquid mixed system was obtained.

[0078] 3...

Embodiment 3

[0089] Example 3 Preparation of high-purity magnesium oxide and fibrous magnesium hydroxide with magnesite

[0090] Experiment 1

[0091] Follow the steps below:

[0092] 1) Using the magnesite in Table 1 as raw material, calcining at 750°C for 2 hours to obtain light-burned magnesium powder, and then crushing and sieving to obtain calcined magnesia powder with a particle size of -200 mesh.

[0093] 2) Take 5.4kg of ammonium chloride solid and 0.61kg of ammonium sulfate, add water to fully dissolve, adjust the solution volume to 10L, then add 1400g of lightly burned magnesium powder (solid-liquid ratio is 140g / L, NH 4 + :MgO is 3.5:1), put it into the reaction kettle, adjust the temperature of the water bath to 90°C, keep the stirring speed at 180rpm during the reaction process, and adjust the negative pressure to a relative vacuum of -0.09Mp, absorb the evaporated ammonia with water, and leaching After 1.5 hours, a solid-liquid mixed system was obtained.

[0094] 3) Sucti...

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Abstract

The invention discloses a method for preparing magnesium oxide from magnesite. The method comprises the following steps: 1) calcining magnesite to obtain caustic-burned magnesia powder; 2) adding the caustic-burned magnesia powder into an ammonium salt solution for leaching, wherein the leaching process is performed under the conditions of reduced pressure, water bath heating and stirring; and 3) filtering to obtain magnesium salt leachate; 4) enabling the magnesium salt leachate to react with ammonia water to obtain magnesium hydroxide precipitate, and calcining to obtain magnesium oxide. The invention also discloses a method for preparing magnesium oxide and fibrous magnesium hydroxide from magnesite, which comprises the following steps: 1) calcining magnesite to obtain caustic-burned magnesia powder; 2) adding the caustic-burned magnesia powder into an ammonium salt solution for leaching, wherein the leaching process is performed under the conditions of reduced pressure, water bath heating and stirring; 3) extracting upper- and middle-layer suspension of the solid-liquid mixed system and performing suction filtration to obtain filtrate and a filter cake; drying the filter cake to obtain fibrous magnesium hydroxide; and combining the precipitate slag washing liquid with the filtrate to obtain magnesium salt leachate; and 4) enabling the magnesium salt leachate to react with ammonia water to obtain magnesium hydroxide precipitate, and calcining to obtain magnesium oxide.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for preparing magnesium oxide or magnesium oxide and fibrous magnesium hydroxide from magnesite. Background technique [0002] my country's magnesite resources are very rich, the reserves rank first in the world, accounting for one-third of the world's total reserves, mainly distributed in Liaoning, Hebei, Shandong and other provinces and cities. Magnesite is widely used in many fields such as refractory materials, ironmaking additives, magnesium oxychloride cement, flue gas desulfurization, and acid wastewater treatment. High-purity magnesium oxide generally refers to magnesium oxide with a magnesium oxide content higher than 98%. It has high whiteness, good dispersion, and excellent properties such as expansion, electrical insulation, and thermal conductivity at high temperatures. It is used as a filler in coatings, rubber, and plastics. , and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/08C01F5/16C01F5/20
CPCC01F5/08C01F5/16C01F5/20C01P2002/72C01P2004/03C01P2004/10C01P2006/80
Inventor 张旭闫平科许国成
Owner 张旭
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