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Method for preparing nano-sized magnesium hydroxide and nano-silica by utilization of boron mud

A technology of nano-magnesium hydroxide and nano-white carbon black, which is applied in the direction of magnesium hydroxide, silicon oxide, silicon dioxide, etc., can solve the problems of comprehensive utilization of boron mud pollution, achieve good dispersibility and surface activity, light bulk density, The effect of high purity

Inactive Publication Date: 2012-12-12
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the pollution caused by boron mud to the environment and the current situation of comprehensive utilization, and proposes a method for efficiently utilizing magnesium oxide and silicon dioxide components in boron mud to prepare nano-magnesium hydroxide and nano-white carbon black

Method used

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  • Method for preparing nano-sized magnesium hydroxide and nano-silica by utilization of boron mud
  • Method for preparing nano-sized magnesium hydroxide and nano-silica by utilization of boron mud
  • Method for preparing nano-sized magnesium hydroxide and nano-silica by utilization of boron mud

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Embodiment 1

[0037] Calcinate 200g of boron slime at 600°C for 1h; take 100g of calcined boron slime, add 180g of water, 120g of sulfuric acid with a concentration of 96%, react at 95°C for 1.5h; separate the solid and liquid components after filtration; add 5.0g of Hydrogen peroxide with a mass concentration of 30% was reacted at 60°C for 15 minutes; the pH of the system was adjusted by adding sodium hydroxide solution to 6.5, and aged for 30 minutes; after filtering and separating the precipitate, the Baume degree of the solution was adjusted to 20°, Add 0.12g of ethylene glycol, add sodium hydroxide solution dropwise at 80°C until the pH of the system is 13, age for 50 minutes, filter, wash, and dry to obtain a flaky nano-sized magnesium hydroxide product.

[0038] Take 40g of dry acid-soluble filter residue, add 120g of water and 13g of solid sodium hydroxide, stir and react at 95°C for 1h, filter to remove the residue, add water to adjust the Baume degree of the filtrate to 20°, add 1....

Embodiment 2

[0040]Calcinate 500kg of boron mud at 600°C for 1h; take 200kg of calcined boron mud, add 360kg of water, 240kg of sulfuric acid with a concentration of 96%, and react at 100±5°C for 1.5h; separate the solid and liquid components after filtration; add 10kg of hydrogen peroxide with a mass concentration of 30% was reacted at 60°C for 15 minutes; the pH value of the system was adjusted by adding sodium hydroxide solution to 6.5, and aged for 30 minutes; Add 0.24 kg of polyethylene glycol, add sodium hydroxide solution dropwise at 80°C until the pH of the system is 13, age for 50 minutes, filter, wash, and dry to obtain a flaky nano-sized magnesium hydroxide product.

[0041] Take 80kg of dry acid-soluble filter residue, add 220kg of water and 26kg of solid sodium hydroxide, stir and react at 100±5°C for 1h, filter to remove the residue, add water to adjust the Baume degree of the filtrate to 20°, add 2.4kg of silane, Add sodium silicate solution with a Baume degree of 20° and su...

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Abstract

The invention relates to a method for preparing nano-sized magnesium hydroxide and nano-silica by the utilization of boron mud, comprising the following steps of: adding calcined boron mud into concentrated sulfuric acid for acid leaching and dissociation; carrying out solid-liquid separation on a pickle liquor which has undergone acid leaching and dissociation; oxidizing a filtrate which has undergone solid-liquid separation and using alkali lye for precipitation separation of iron hydroxide; adding the iron-removed filtrate into a particle surface modifier and alkali lye to prepare nano-sized magnesium hydroxide; carrying out alkali dissolution by the use of acid slag obtained after solid-liquid separation, filtering, and adding a particle blocker and an acid solution into a filtrate to prepare nano-silica. According to the technology, main ingredients of magnesium oxide and silica in boron mud can be highly efficiently and comprehensively utilized to prepare the product with high added value, and the environmental pollution problem of boron mud can be solved. The magnesium hydroxide prepared in the invention is sheet-shaped nanometer magnesium hydroxide. White carbon black is spherical nanometer white carbon black.

Description

technical field [0001] The invention relates to a method for preparing nano magnesium hydroxide and nano white carbon black by utilizing boron mud, and belongs to the technical field of mineral processing and solid waste utilization. Background technique [0002] Boron mud is the waste residue produced in the production of boric acid, borax and other products. Boron mud is light red, fine and loose, and its main components are MgO and SiO 2 , and contains a small amount of Fe 2 o 3 、Al 2 o 3 , CaO, B 2 o 3 Wait. Since the boron mud is alkaline, its lye can dissolve into the groundwater, reducing the yield of the surrounding farmland, and in severe cases, it can lead to the failure of the crops and pollute the surrounding drinking water. Therefore, it not only occupies the land, but also causes serious pollution to the surrounding cultivated land, and the land where it is discharged is exhausted and no grass grows. With the continuous development of social economy, t...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01B33/12B82Y40/00B09B3/00
Inventor 郑水林宋贝狄永浩侯会丽刘超
Owner CHINA UNIV OF MINING & TECH (BEIJING)