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Technology for preparing high purity magnesia by high concentration magnesium oxide solution

A technology of magnesium chloride solution and high-purity magnesia, which is applied in the field of refractory materials, can solve the problems of high heat energy consumption, long process, pollution, etc., and achieve the effect of improving refining technology and product quality

Inactive Publication Date: 2003-04-30
刘绪庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can obtain high-purity magnesia with a purity of 98-99%, but the process is long, polluted, and costly
A set of equipment for CaO production is also needed, which requires a large investment and high heat energy consumption

Method used

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  • Technology for preparing high purity magnesia by high concentration magnesium oxide solution
  • Technology for preparing high purity magnesia by high concentration magnesium oxide solution
  • Technology for preparing high purity magnesia by high concentration magnesium oxide solution

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048] The removal of SO of example 1 magnesium chloride solution 4 ＝

[0049] 450g / L of MgCl 2 Solution 1000ml, add 20g / l BaCl 2 solution until no more BaSO 4 until precipitation. Filter to remove filter cake BaSO 4 Precipitate, that is obtained by removing SO 4 ＝ Refined MgCl 2 solution, its SO 4 ＝ content below 10 -6 g / l.

example 2

[0050] The boron removal of example 2 magnesium chloride solution

[0051] In the ion-exchange column, a commercially available anion-exchange resin selectively absorbing boron is loaded. The exchange column is 1500mm high, and the column diameter is 70mm, consisting of three stages. Adjust MgCl 2 Solution pH=10, then let boron-containing MgCl 2 (Containing about 12-15ppm boron) solution flows through the exchange column. MgCl obtained after deboronation by exchange column 2 B in solution 2 o 5 The content is less than 0.5ppm.

example 3

[0053] The concentration is 450g / l has removed SO 4 ＝ and deboronated refined MgCl 2 The solution is sprayed into the hydrolysis reactor from the nozzle, and reacted at 850-800°C for 5 minutes to obtain powdery magnesium oxide powder, which is washed with hot water at 90°C to remove soluble chloride, and the filtrate is filtered and discarded. Baking in a high temperature furnace at 850-900°C for 60 minutes, and then hot pressing into pellets under a pressure of 320MPa. Put it into a high-temperature furnace at 1800°C for calcination for 60 minutes, and obtain high-purity sintered magnesia after cooling. MgO>98%, bulk density>3.4g / cm 3 , crystal particle size>80μm, B 2 o 3 <0.003%.

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Abstract

A process for preparing high-purity magnesium sand from high-concentration solution of magnesium chloride refining the said solution for removing SO4 and B, spraying it in reactor, high-temp atomizing and hydrolyzing to obtain high-purity magnesium oxide powder, water washing, calcining to obtain light-burnt magnesium oxide powder, hot die pressing, and high-temp sinter. Its advantages are high speed, low energy consumption, high productivity and recovering hydrochloric acid as by-product.

Description

Technical field: [0001] The invention relates to the field of refractory materials, and relates to the production technology of magnesia, in particular to the improvement of the production technology of high-purity magnesia. Background technique: [0002] High-purity magnesia is an indispensable material for preparing high-grade refractory materials in the modern metallurgical industry. The production of traditional magnesia mainly uses magnesite, dolomite and brucite as raw materials, firstly produces magnesia powder, then roasts it into light-calcined magnesia powder, and then sinters or melts it into high-purity magnesia at high temperature. [0003] The process of producing magnesite from dolomite and magnesite is long, polluted, high cost, and low in purity, and it is difficult to meet the standard of 98%-99% MgO content. [0004] Using brucite made from seawater as raw material to produce magnesia has not yet achieved industrialization in China, and the route of indus...

Claims

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Application Information

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IPC IPC(8): C01F5/10C04B2/10C04B35/04
Inventor 刘绪庆
Owner 刘绪庆
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