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Method for preparing magnesium hydrate nano powder by active acid leaching nickel-containing serpentine

A technology of magnesium hydroxide and nano-powder, applied in magnesium hydroxide and other directions, can solve the problems of increased purification and impurity removal costs, high acidity of leaching solution, and high leaching cost, and achieves shortened preparation cycle, good product quality, and shortened reaction time. Effect

Active Publication Date: 2009-06-17
新疆世全黄金矿业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned conventional sulfuric acid leaching process, the acidity of the leaching solution is high, and the leaching cost is relatively high, and a large amount of alkali is consumed in the purification treatment process, resulting in an increase in the cost of purification and impurity removal

Method used

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  • Method for preparing magnesium hydrate nano powder by active acid leaching nickel-containing serpentine

Examples

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Effect test

Embodiment 1

[0015] Example 1: Take the serpentine ore containing 0.5-1% nickel, 25% MgO, and 1.72% Mn and heat it at 550°C for 1.5h for activation pretreatment. After taking it out, ball mill it to -74 μm, and then add 3.0mol / L sulfuric acid was leached in the microwave for 30min, the solid-liquid ratio was 1:8, the leaching temperature was 100°C, the stirring speed was 900r / min, the pH value of the leaching solution was 1.8, and then Na with a concentration of 7.2mol / L was added. 2 CO 3 The solution is filtered until the pH is 2 to remove iron, and the leaching solution after sinking alum is added with Na at a concentration of 2.5mol / L at 40°C. 2 S solution until the pH is 5.2. At this time, the heavy metal ions in the leaching solution form black precipitates. Filter the purified solution obtained by filtering the precipitates. Add sodium hydroxide with a concentration of 5.0 mol / L under the condition of constant stirring speed at 30 ° C. The pH of the solution is 7.3 for nickel preci...

Embodiment 2

[0016] Example 2: Take the serpentine ore containing 1% nickel, 28% MgO, and 1.52% Mn and heat it at 550°C for 1.5h for activation pretreatment. After taking it out, it will be ball milled to -74 μm, and then the solid-to-liquid ratio will be 1. :7 Add 3.5mol / L sulfuric acid for conventional leaching for 2 hours, the leaching temperature is controlled at 100°C, the stirring speed is 900r / min, the pH value of the leaching solution is 1.8, and then adding Na concentration of 7.5mol / L 2 CO 3 The solution is filtered until the pH is 2 to remove iron; the leaching solution after iron removal is stirred at 45°C and 900r / min, and Na with a concentration of 2.5mol / L is added. 2 S solution until the pH is 5.1. At this time, the heavy metal ions in the leaching solution form black precipitates. Filter the purified solution from the precipitates at 35°C and add a sodium hydroxide solution with a concentration of 5.5 mol / L under the condition of constant stirring speed. When the pH is 7....

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Abstract

The invention relates to a method for preparing magnesium hydroxide nano powder through activation and acid leaching of nickel-containing serpentine, which comprises: adopting the nickel-containing serpentine as a raw material and a sulfuric acid as a leaching agent, removing iron by an amarillite method, removing heavy metals by a vulcanization method, adopting a NaOH solution for neutralization and nickel deposit, and adopting an oxidant and an ammonia water solution to adjust the pH value and perform aging, filtration and demanganization; and adopting ammonia water or a sodium hydroxide solution as a precipitant and anhydrous alcohol as a stabilizer and dehydrant, and performing ultrasonic chemical precipitation reaction at a temperature of between 30 and 55 DEG C; and preparing the magnesium hydroxide nano powder after heat insulation, aging, centrifugal separation, washing and microwave drying, wherein the particle diameter of the magnesium hydroxide nano powder is between 20 and 50 nanometers, and particles of the magnesium hydroxide nano powder are uniformly distributed.

Description

1. Technical field [0001] The invention relates to a method for preparing magnesium hydroxide nanopowder by activated acid leaching of nickel-containing serpentine, belonging to the technical field of powder metallurgy 2. Background technology [0002] my country is very rich in serpentine resources, with a huge amount of mineral deposits, good texture and most of the ores contain valuable resources such as nickel and magnesium. Although serpentine mines have been well developed and utilized in recent years, the overall research level is not high and is still in its infancy. Serpentine is a high magnesium mineral, its main components are: MgO 43.6%, SiO 2 43.3%, H 2 O 13.1%. Serpentine ore can be used as an important mineral source for refractory materials and valuable elements such as Mg, Ni and Pd. Those with higher magnesium content can be used to extract magnesium metal, and those with higher cobalt and nickel content can be used to extract cobalt and nickel. Sichua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/20
Inventor 宋宁杜景红陈为亮严继康严玉环姚云
Owner 新疆世全黄金矿业股份有限公司