Method for preparing silicon-steel-grade magnesium oxide from magnesium sulfate waste liquor

A magnesium sulfate and magnesium oxide technology, applied in the direction of magnesium oxide, can solve the problems of unstable product quality, high product impurity content, and low level of refinement, and achieve important environmental and social benefits, low impurity content, and production process simple effect

Inactive Publication Date: 2012-10-03
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] However, the current method of producing silicon steel grade magnesium oxide still has small production scale, unstable product quality, high impurity content in the product, low level of automation and refinement, and product quality cannot fully meet the requirements of the rapidly growing domestic oriented silicon steel production and development, etc. problems, and the method of preparing high value-added silicon steel grade magnesium oxide from the magnesium sulfate waste liquid produced in the laterite nickel ore hydrometallurgy process has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) According to the volume of hydrogen peroxide accounting for 4% of the volume of magnesium sulfate waste liquid, the Mg 2+ The industrial magnesium sulfate waste liquid with a concentration of 14.5g / L and the industrial hydrogen peroxide with a mass concentration of 30% are mixed, and then the pH value of the mixed solution is adjusted to 7 with a sodium carbonate solution with a concentration of 2mol / L, and then heated at 50°C 1. Reacting for 20 minutes under the condition of stirring speed of 300 rpm, aging for 1 hour at last, and then filtering, the filtrate is the magnesium sulfate purification solution;

[0025] (2) Use the ammonium carbonate solution with a concentration of 2mol / L as the precipitant, and add its dosage into the magnesium sulfate purification solution obtained in step (1) according to 1.1 times the theoretical amount. Under conditions, react for 1h, then age for 1h, then filter, and dry the filter cake to obtain basic magnesium carbonate;

[00...

Embodiment 2

[0029] (1) According to the volume of hydrogen peroxide accounting for 5% of the volume of magnesium sulfate waste liquid, the Mg 2+ The industrial magnesium sulfate waste liquid with a concentration of 18.3g / L and the industrial hydrogen peroxide with a mass concentration of 30% are mixed, and then the pH value of the mixed solution is adjusted to 8 with a sodium carbonate solution with a concentration of 2mol / L, and then heated at 70°C 1. React for 25min under the condition of stirring speed of 400rpm, finally age for 1h, and then filter, and the filtrate is the magnesium sulfate purification solution;

[0030] (2) Use the ammonium carbonate solution with a concentration of 2mol / L as the precipitant, and add its dosage into the magnesium sulfate purification solution obtained in step (1) according to 1.2 times the theoretical amount. Under conditions, react for 0.5h, then age for 1h, then filter, and dry the filter cake to obtain basic magnesium carbonate;

[0031] (3) Calc...

Embodiment 3

[0034] (1) According to the volume of hydrogen peroxide accounting for 7% of the volume of magnesium sulfate waste liquid, the Mg 2+ The industrially produced magnesium sulfate waste liquid with a concentration of 22.5g / L is mixed with industrial hydrogen peroxide with a mass concentration of 30%, and then the pH value of the mixed solution is adjusted to 7 with a sodium carbonate solution with a concentration of 2mol / L, and then heated at 60°C 1. Reacting for 30min under the condition of stirring speed of 500rpm, aging for 1h at last, and then filtering, the filtrate is the magnesium sulfate purification solution;

[0035] (2) Use the ammonium carbonate solution with a concentration of 2mol / L as the precipitant, and add its dosage into the magnesium sulfate purification solution obtained in step (1) according to 1.2 times the theoretical amount. Under conditions, react for 1h, then age for 1h, then filter, and dry the filter cake to obtain basic magnesium carbonate;

[0036]...

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Abstract

The invention provides a method for preparing silicon-steel-grade magnesium oxide from magnesium sulfate waste liquor, which comprises the following steps: mixing magnesium sulfate waste liquor and oxydol, regulating the pH value of the mixed liquor, stirring, aging, and filtering, wherein the filtrate is magnesium sulfate purified liquor; adding a precipitant ammonium carbonate solution into the magnesium sulfate purified liquor, stirring, aging, filtering, and drying the filter cake to obtain basic magnesium carbonate; calcining the basic magnesium carbonate, and washing with water at normal temperature to obtain magnesium oxide; and grinding and screening to obtain the silicon-steel-grade magnesium oxide. In the invention, the magnesium sulfate waste liquor generated in the lateritic nickel ore wet-method smelting process is used as the raw material to prepare high-added-value silicon-steel-grade magnesium oxide; the production technique is simple; and the produced silicon-steel-grade magnesium oxide product has the characteristics of high chemical purity, low impurity content and small average particle size. The purity of the silicon-steel-grade magnesium oxide is greater than 98%, the hydration rate is less than 5%, and the average particle size is smaller 5 mu m.

Description

technical field [0001] The invention relates to a method for comprehensively recovering magnesium from magnesium sulfate waste liquid produced in the laterite nickel ore hydrometallurgy process, specifically a method for preparing high value-added silicon steel grade magnesium oxide using magnesium sulfate waste liquid as raw material, belonging to chemical technology field. Background technique [0002] There are often a large amount of magnesium resources associated with laterite nickel ore. After sulfuric acid leaching and precipitation of nickel laterite nickel ore by hydrometallurgy process, a large amount of magnesium sulfate waste liquid is often produced. This magnesium sulfate waste liquid not only pollutes the environment, but also makes the potential value higher Magnesium resources cannot be effectively utilized, which greatly reduces the comprehensive utilization rate of laterite nickel ore resources. Therefore, it is particularly important to study a method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06
Inventor 陈为亮马力言宋宁戴永年
Owner KUNMING UNIV OF SCI & TECH
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