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A process for preparing high-purity magnesium oxide by two-grate firing method

A magnesium oxide, high-purity technology, applied in the direction of magnesium oxide, etc., to achieve the effect of simple process and low cost

Active Publication Date: 2015-12-30
新疆世全黄金矿业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] To sum up, the prior art of preparing high-purity magnesium oxide by carbonization has certain advantages, and has been continuously developed in recent years, and there are many improvements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Grinding the low-grade magnesite ore to a particle size of 100 mesh, and putting it into the reverberatory furnace I at 400 o Burn at a temperature of C for 60min, then transfer to reverberatory furnace II at 800 oC 200mL of 37%wt hydrochloric acid was weighed, and stirred at room temperature for 50min under reflux. After the reaction was completed, the filtrate was collected by suction filtration, and the filtrate was a magnesium salt solution containing impurity ions; (3) at room temperature, add NH 4 HCO 3 Aqueous solution, adjust the pH to 8, let stand and age for 20min, wait for the precipitate to gather into large particles, then filter with suction, wash the precipitate with water for 3 times and then filter with suction to minimize the magnesium ions adsorbed on the precipitate, (4) put the filtrate at room temperature Continue to join NH under 4 HCO 3 , to finally obtain the basic magnesium carbonate solid, put the dried basic magnesium carbonate into 8...

Embodiment 2

[0037] The particle size of the crushed magnesite is 200 mesh, and others are the same as in Example 1. The leaching rate of magnesium oxide can reach 96.12% as detected by atomic absorption spectrophotometer, and the purity of the prepared magnesium oxide can reach 99.9wt%.

Embodiment 3

[0039] Weigh 100g and add 250mL of 37%wt hydrochloric acid, and the others are the same as in Example 1. The leaching rate of magnesium oxide can reach 95.15% as detected by atomic absorption spectrophotometer, and the purity of the prepared magnesium oxide can reach 99.86wt%.

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PUM

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Abstract

The invention provides a process for preparing high-purity magnesia by two-grate firing method, comprising the following steps: (1) pulverizing low-grade magnesite ore, and then firing twice in a reverberatory furnace; (2) adding 37wt% hydrochloric acid for acid leaching, heating, reflux and stirring, and suction filtration to collect the filtrate; (3) adding NH4HCO3 to adjust the pH value to 8-9, standing and aging for 10-30min, and suction filtration to collect the filtrate; (4) continue to add NH4HCO3 to the filtrate until no sediment Formation, react at 10-30oC to obtain basic magnesium carbonate, dry and pyrolyze to obtain high-purity magnesium oxide.

Description

technical field [0001] The invention relates to a method for preparing high-purity magnesium oxide by adopting a two-grate firing method. Background technique [0002] The preparation methods of high-purity magnesium oxide include high-temperature hydrolysis method, precipitation method, lime brine method, soda ash method, ammonia method, carbonization method, etc. [0003] 1. High-temperature hydrolysis method: Spray the aqueous solution of bischofite, after 500 o C Calcination, first remove part of the crystal water to generate MgO MgCl 2 ·H 2 O, then converted to magnesium hydroxychloride Mg(OH)Cl, when the temperature further increased beyond 150 o At C, Mg(OH)Cl continues to be decomposed into MgO, the reaction formula is: [0004] MgCl 2 +H 2 O→Mg(OH)Cl+HCl [0005] Mg(OH)Cl→MgO+HCl [0006] The high-temperature HCl gas generated by this method is highly corrosive, requires high equipment, consumes a lot of energy, and costs a lot. [0007] 2. Precipitation me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/02
Inventor 许元兴
Owner 新疆世全黄金矿业股份有限公司