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Method for preparing high-purity magnesium hydroxide by using atomized ammonia as precipitator

A technology of magnesium hydroxide and precipitating agent, applied in magnesium hydroxide and other directions, can solve the problems of high free ammonia concentration and environmental pollution, and achieve the effects of high purity, less investment and more specifications

Inactive Publication Date: 2010-07-14
DALIAN MARITIME UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of free ammonia in the reaction system is high, which is easy to cause environmental pollution
There are reports on the preparation process of high-purity magnesium hydroxide, but the precipitating agent is ammonia gas obtained by evaporating liquid ammonia, not the atomized ammonia water using this technology

Method used

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  • Method for preparing high-purity magnesium hydroxide by using atomized ammonia as precipitator
  • Method for preparing high-purity magnesium hydroxide by using atomized ammonia as precipitator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Continuous

[0037] (1) preparation concentration is the magnesium chloride solution of 2mol / L:

[0038] Add bischofite to deionized water, stir at room temperature until completely dissolved, and prepare a magnesium chloride solution with a concentration of 2 mol / L; use a filter press to filter the solution to remove impurities;

[0039] (2) Inject the reaction bottom solution

[0040] Inject 15 liters of distilled water into a reactor with an effective volume of 30 liters as the bottom liquid, add 100 g of seed crystals, heat to 85 ° C and keep it warm;

[0041] (3) Inject atomized ammonia water

[0042] Continuously inject atomized ammonia water with a mass concentration of 10% at a ratio of 1:2 to magnesium ions.

[0043] (4) inject magnesium chloride solution

[0044] 10 minutes after the injection of atomized ammonia, the magnesium chloride solution with a concentration of 3mol / L was continuously injected into the reactor at a flow rate of 40 liters per hour, ...

Embodiment 2

[0049] Intermittent

[0050] (1) preparation concentration is the magnesium chloride solution of 4.5mol / L:

[0051] Add bischofite to deionized water, stir at 50°C until completely dissolved, and prepare 15 liters of magnesium chloride solution with a concentration of 4.5mol / L; use a filter press to filter the solution to remove impurities;

[0052] (2) Inject the reaction bottom solution

[0053] Inject 15 liters of distilled water into a reactor with an effective volume of 30 liters as the bottom liquid, add 100 g of seed crystals, heat to 85°C and keep it warm;

[0054] (3) Inject atomized ammonia water

[0055] Continuously inject atomized ammonia water with a mass concentration of 25% at a ratio of 1:2 to magnesium ions.

[0056] (4) inject magnesium chloride solution

[0057] 5 minutes after atomized ammonia began to inject, the magnesium chloride solution with a concentration of 4.5mol / L was continuously injected into the reactor at a flow rate of 30 liters per hour...

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Abstract

The invention provides a method for preparing magnesium hydroxide with high purity taking atomizing ammonia as precipitant, relating to a method which takes bischofite as raw material and ammonia as the precipitant to intermittently or continuously produce magnesiu m hydroxide with the high purity, is characterized in that the processed material is prepared into the solution of 1mol / L-4.5mol / L; the base solution with crystal seeds reacts with the atomizing ammonia with quality percentage of 5 to 30 percent to prepare magnesium hydroxide. The prepared magnesium hydroxide products have large particles, high purity and the particle size can be controlled between 10 microns and 100 microns and the purity can reach 98 to 99.999 percent. The safety is much better than the safety of ammonia withless device and the investment and environmental pollution. The ammonia and the nitrogen in tail liquid are processed to reach the standard of environmental protection by adopting commodity method; the products prepared in the invention has the advantages of large particles, more specifications, favorable safety, high production efficiency, less initial investment and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and inorganic non-metallic materials. Background technique [0002] At present, foreign countries use brine or seawater as raw material and milk of lime as precipitant to prepare magnesium hydroxide. In China, there are researches on using ammonia water to prepare magnesium hydroxide, but the product has low purity, small particle size, and difficult filtration, so it cannot reach the goal of this technology. standard. The magnesium hydroxide product of this technology has large particles and high purity, and no relevant literature reports have been seen so far. [0003] Now the commonly used process of using bischofite as raw material to prepare magnesium hydroxide is summarized as follows: [0004] (1) Lime brine method [0005] with MgCl 2 ·6H 2 O is the raw material and reacts with milk of lime to generate Mg(OH) 2 precipitation. [0006] MgCl 2 +Ca(OH) 2 →CaCl 2 +Mg(OH) 2 ↓ [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/20
Inventor 徐久军王建力杜吉胜
Owner DALIAN MARITIME UNIVERSITY
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