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Method for producing high-purity magnesium hydroxide and magnesium oxide from low-grade magnesite

A magnesium hydroxide and magnesite technology, which is applied in the production of magnesium hydroxide and lime, can solve the problems of strong acid consumption, pollution, and underutilization of other components, and achieve the goal of reducing pollution and improving resource utilization Effect

Inactive Publication Date: 2015-09-09
新疆蓝天镁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a method for producing high-purity magnesium hydroxide and magnesium oxide from low-grade magnesite. problems of underutilization and environmental pollution

Method used

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  • Method for producing high-purity magnesium hydroxide and magnesium oxide from low-grade magnesite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, the method for preparing high-purity magnesium hydroxide and magnesium oxide from this low-grade magnesite is carried out as follows:

[0026] Take 1000g magnesite and calcinate it in a calciner at 950°C for 3 hours (the loss on ignition rate is 47.5%), recover the carbon dioxide decomposed by calcination; crush the calcined magnesite ore and grind it into 200 mesh to 300 mesh Purpose Lightly burned powder: add 980ml of water to the lightly burned powder and stir evenly to prepare a lightly burned powder slurry with a concentration of 35%. Take 1150g of ammonium chloride, add 2500ml of water and stir to dissolve, and then prepare 25% ammonium chloride solution; light calcined powder slurry and ammonium chloride solution are reacted in an enamel kettle with stirring and heating, the reaction temperature is 105°C, and the reaction time is 3h. The ammonia gas, Magnesium chloride and calcium chloride, the ammonia gas is recovered and condensed into ammonia wat...

Embodiment 2

[0027] Embodiment 2, the method for preparing high-purity magnesium hydroxide and magnesium oxide from this low-grade magnesite is carried out according to the following steps:

[0028] Take 1000g magnesite and calcinate it in a calcination furnace at 1000°C for 3 hours (the loss on ignition rate is 49.8%), recover the carbon dioxide decomposed by calcination, crush the calcined magnesite ore, and grind it into -200 mesh light For the burnt powder, add 1000ml of water to the lightly burnt powder and stir to prepare a lightly burnt powder slurry with a concentration of 35%; take 1200g of ammonium chloride; add 3800ml of water, stir to dissolve, and prepare a 20% Ammonium chloride solution; lightly burned powder slurry reacts with ammonium chloride solution in a stirred and heated enamel kettle, the reaction temperature is 110°C, and the reaction time is 3 hours. During the reaction, ammonia gas, magnesium chloride and chloride gas are generated. Calcium and ammonia gas are reco...

Embodiment 3

[0029] Embodiment 3, the method for preparing high-purity magnesium hydroxide and magnesium oxide from this low-grade magnesite is carried out according to the following steps:

[0030] Take 1000g magnesite and calcinate it in a calcination furnace at 900°C to 1100°C for 3 hours (the loss on ignition rate is 49.8%), recover the carbon dioxide decomposed by calcination, crush the lightly burned ore of calcined magnesite, and grind it into - 200 mesh to +300 mesh lightly burned powder; add 1000ml of water to the lightly burned powder and stir to prepare lightly burned powder slurry with a concentration of 30% to 40%; take 1200g of ammonium chloride, add water 3800ml, stirred and dissolved, and prepared into 20% to 30% ammonium chloride solution; lightly burned powder slurry and ammonium chloride solution were carried out in an enamel kettle with stirring and heating, and the reaction temperature was 100°C to 120°C. The time is 2h to 4h, the ammonia gas, magnesium chloride and calc...

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Abstract

The invention relates to the field of mineral resource processing technology, in particular to a method of producing high-purity magnesium hydroxide and magnesium oxide by low-grade magnesite. The method comprises the following steps: calcining low-grade magnesite in a calcining furnace at calcining temperature to obtain light-calcining magnesite ore and carbon dioxide, recovering the carbon dioxide, and crushing the calcined light-calcining magnesite ore. By utilizing a method of realizing leaching, purification and separation coupling of the low-grade magnesite and producing high-pruity magnesium hydroxide and magnesium oxide through recycling of ammonia-ammonium slat, the advantages of preparing high-purity products by adopting the traditional bittern-ammonia process can be fully achieved, the method is of green and cycling clean production technique method, no wastes are emitted in the whole process, resources can be comprehensively utilized, the utilization rate of the magnesite resource can be improved, strong acid is not consumed in the technique process, other constitutions are fully utilized, the pollution to the environment can be reduced, and the method provides a new approach for reasonably developing and utilizing the low-grade magnesite resources.

Description

technical field [0001] The invention relates to the technical field of mineral resource processing, and relates to a method for producing high-purity magnesium hydroxide and magnesium oxide from low-grade magnesite. Background technique [0002] The main chemical composition of magnesite is MgCO 3 , the main purpose is to prepare magnesium-based refractory materials and magnesium-containing chemicals. my country's reserves of magnesite resources rank first in the world, and it is the world's largest producer and exporter of magnesium products. Because it mainly uses primary raw materials and products with low added value and low technological content, there is a waste of resources and pollution of the environment. and low efficiency issues. Magnesite is a non-renewable resource. At present, due to people's unreasonable development and utilization of it, the high-quality magnesite resources in my country are decreasing day by day. Most of the existing magnesite contains MgCO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10C01F5/20
CPCY02P40/40
Inventor 王云山许景秀
Owner 新疆蓝天镁业股份有限公司
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