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Method for producing high-purity magnesium oxide by adopting brine-carbide slag method

A technology of calcium carbide slag and magnesium oxide, applied in the direction of magnesium oxide, magnesium hydroxide, etc., can solve the problems of high energy consumption, low output, and affecting the quality of cement, and achieve the effect of improving product quality and purity

Active Publication Date: 2021-01-08
陕西航泰镁基材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the limestone process, the cement production process with calcium carbide slag has about 20% higher energy consumption and about 20-25% lower output.
Moreover, calcium carbide slag contains more impurities such as sulfur, phosphorus, and chlorine, and these impurities will also affect the quality of cement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for producing high-purity magnesia by adopting the brine-carbide slag method, comprising the following steps:

[0041] S1. Slurry and dilute the carbide slag with circulating mother liquor or recycled washing water, and then perform cyclone separation to obtain refined calcium carbide slag milk;

[0042] When beating, the ratio of solid to liquid between carbide slag and circulating mother liquor or circulating washing water is 1g / 5-10mL; during cyclone purification, the concentration of carbide slag slurry is 3-5wt%.

[0043] The concentration of calcium hydroxide is 0.022mol / L in the detection of refined calcium carbide slag milk. Among them, calcium carbide slag is obtained from Shaanxi Jintai Chlor-Alkali and Beiyuan Chemical respectively. The calcium carbide slag is in the form of paste. The typical test results are: weight loss on drying: 39%; calcium oxide: 38.5wt%.

[0044] S2, adding the circulating mother liquor and calcium carbide slag in turn to th...

Embodiment 2

[0051] A kind of method adopting brine-carbide slag method to produce high-purity magnesia is identical with the method of embodiment 1, and its difference is, comprises the following steps:

[0052] S5, using the magnesium oxide obtained in Example 1 as a raw material to carry out purification treatment through hydration reaction; the specific operations are as follows:

[0053] S5.1, configuring a hydrating agent solution with a magnesium content of 0.06mol / L; the hydrating agent solution is obtained by dissolving magnesium chloride and calcium chloride in circulating mother liquor or circulating washing water; wherein the concentration of magnesium ions is 0.06mol / L L, the concentration of calcium ions is 1mol / L.

[0054] S5.2. Add 20 g of magnesia to 1 L of hydrating agent solution, carry out hydration reaction at 50° C. for 30 minutes; perform cyclone separation and purification, and then carry out aging reaction for 24 hours to obtain seed crystal slurry;

[0055] S5.3,...

Embodiment 3

[0058] A method for producing high-purity magnesia by adopting the brine-carbide slag method, comprising the following steps:

[0059] S1. Slurry and dilute the carbide slag with circulating mother liquor or recycled washing water, and then perform cyclone separation to obtain refined calcium carbide slag milk;

[0060] When beating, the ratio of solid to liquid between carbide slag and circulating mother liquor or circulating washing water is 1g / 5-10mL; during cyclone purification, the concentration of carbide slag slurry is 3-5wt%.

[0061] The concentration of calcium hydroxide is 0.32mol / L in the refined calcium carbide slag milk.

[0062] Among them, calcium carbide slag is taken from Henan Jiyuan Lianchuang Chemical Industry and is in powder form. Test result (typical value): loss on drying: 19%; calcium oxide: 51%.

[0063] S2, adding the circulating mother liquor and calcium carbide slag in turn to the brine containing soluble magnesium salts for refining to obtain r...

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PUM

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Abstract

The invention provides a method for producing high-purity magnesium oxide by adopting a brine-carbide slag method, which comprises the following steps of S1, pulping and diluting carbide slag by usingcirculating mother liquor or circularly used washing water, and then carrying out cyclone separation and purification to obtain refined carbide slag milk, S2, sequentially adding the circulating mother liquor and carbide slag into brine containing soluble magnesium salt for refining to obtain refined brine, S3, adding the refined carbide slag milk in the S1 into the refined brine obtained in theS2, controlling the feeding process to be completed within 20-30 minutes, reacting for 10-30 minutes at 15-35 DEG C, and monitoring the pH value of the reaction end point to be 10-11, and then carrying out aging reaction for 2-24 hours, and S4, circularly operating the precipitation reaction in S3 for 5-20 batches, combining reaction slurry, filtering to obtain a circulating mother liquor and a filter cake, and washing and calcining the filter cake to obtain high-purity magnesium oxide. According to the method, the production cost can be remarkably reduced, and the purity meets the high-puritystandard; and the method can be applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for producing high-purity magnesium oxide by adopting a brine-carbide slag method. Background technique [0002] Magnesium oxide is an inorganic oxide. High-purity magnesium oxide products have many excellent properties, such as: excellent alkali resistance and thermal conductivity, good chemical activity, etc., so in the fields of ceramics, electrical, plastics and rubber processing, It is widely used in the fields of fuel oil and lubricating oil, steel processing and medicine. [0003] At present, the domestic process that can mass-produce high-purity magnesium oxide with a purity of more than 99% mainly adopts the magnesium hydroxide method, that is, the soluble magnesium salt is used as raw material, ammonia or alkali is used as a precipitant, and high-purity magnesium oxide is produced by chemical methods. Pure magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/08C01F5/22
CPCC01F5/08C01F5/22C01P2006/80C01P2006/10
Inventor 马志伟张南江
Owner 陕西航泰镁基材料科技有限公司