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Method for producing nano-magnesium hydroxide by using low-level magnesite

A technology of nano-magnesium hydroxide and magnesium hydroxide, which is applied in the direction of magnesium hydroxide, can solve the problems of land resources occupied by magnesite, and achieve the effects of high utilization rate, good dispersion and high purity

Inactive Publication Date: 2008-07-16
杜高翔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the magnesite discharged due to containing a small amount of impurities occupies a large amount of land resources, causing environmental hazards such as dust

Method used

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  • Method for producing nano-magnesium hydroxide by using low-level magnesite
  • Method for producing nano-magnesium hydroxide by using low-level magnesite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 120g of magnesite powder and calcinate at 1200°C for 20min; take it out and put it in a 1000mL beaker after cooling down, add 150g of water and 80g of 92% sulfuric acid, stir well, add sulfuric acid to adjust the pH to 3-7, filter; take the filtrate, Add 1.00 g of silane coupling agent (brand A-151), stir at 80 ° C, add alkali to react, the alkali solution is sodium hydroxide solution with a mass concentration of 30%, the reaction time is 15 minutes, and aging for 30 minutes after the reaction; Filter the reacted slurry, keep the mother liquor and filter cake; add distilled water to the filter cake to break up and then re-filter, repeat the process 4 times; dry and break up the filter cake to obtain the nano-magnesium hydroxide product; mix the mother liquor and each Sodium sulfate was obtained after the secondary wash was dried at 250°C.

[0040] Table 1 is the test results of the chemical components of the products obtained in the examples, and Table 2 is the tes...

Embodiment 2

[0046] Take 200g of magnesite powder and calcinate at 900°C for 30 minutes; take it out and put it in a 1000mL beaker after cooling down, add 200g of water and 135g of 70% nitric acid, stir well, add nitric acid to adjust the pH to 5-9, and filter; take the filtrate , add 0.500g of water-soluble polymer dispersant (the brand is A9400), stir at 20°C, add alkali to react, the alkali lye is an ammonia solution with a mass concentration of 30%, the reaction time is 15min, and aging for 30min after the reaction; The final slurry is filtered, and the mother liquor and filter cake are kept; the filter cake is dispersed by adding distilled water and re-filtered, and the process is repeated 4 times; the filter cake is dried and dispersed to obtain the nano-magnesium hydroxide product; the mother liquor and each washing The solution was dried at 80°C to obtain ammonium nitrate.

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Abstract

The invention relates to a method for comprehensive utilizing low-taste magnesite, which belongs to a mineral process and environmental protection field. The magnesite powder is calcinated under a temperature ranging from 800 DEG C to 1200 DEG C to prepare magnesia; the magnesia is reacted with sulfuric acid or nitric acid to prepare dissolvable magnesium salt (magnesium sulfate or magnesium nitrate) and the pH value of the system is regulated to 3-9; the reacted slurry is filtered to get filtrate; the filtrate is reacted with alkali (sodium hydroxide or ammonia) and the technological condition is controlled to prepare the slurry of magnesium hydroxide with a granularity of nanometer and a shape of flake; nanometer magnesium hydroxide product is prepared by filtering, aging, drying and scattering the slurry. The filtrate and washings are substantially composed of sodium sulfate, sodium nitrate, ammonium sulfate or ammonium nitrate, from which products of the sodium sulfate, the sodium nitrate, the ammonium sulfate or the ammonium nitrate can be acquired after high efficient evaporation and drying process.

Description

1. Technical field [0001] The invention relates to a method for comprehensive utilization of low-grade magnesite, belonging to the fields of mineral processing and environmental protection. 2. Background technology [0002] my country is rich in magnesite resources, and the magnesite reserves in Northeast China alone have reached more than 3 billion tons. At present, magnesite is mainly used to prepare various magnesia refractory materials and magnesium chemicals. When magnesite contains a small amount of impurity components such as sodium oxide, potassium oxide, iron oxide or silicon dioxide, the refractoriness will drop significantly. Therefore, the market price of refractory materials prepared from low-grade magnesite is very low. In this way, the discharged magnesite due to containing a small amount of impurities occupies a large amount of land resources, causing environmental hazards such as dust. [0003] Aiming at the above situation, the present invention proposes...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01F5/20C01F5/22
Inventor 杜高翔
Owner 杜高翔
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