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Method for preparing basic ammonium aluminum carbonate hydroxide whisker and aluminum oxide whisker co-production liquid sodium silicate from bentonite

A technology of aluminum oxide whiskers and ammonium aluminum carbonate, which is applied in the directions of alkali metal silicates, chemical instruments and methods, silicates, etc. Alumina whisker method, high production cost, high recovery rate, high iron removal efficiency and reduced production cost

Active Publication Date: 2012-08-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, basic ammonium aluminum carbonate whiskers are mainly synthesized by hydrothermal method using aluminum nitrate and ammonium alum as raw materials; aluminum oxide whiskers are mostly made of aluminum powder, aluminum nitrate, aluminum sulfate, etc. It is produced by methods such as thermal method, melting method and fluxing method. The raw materials used in the above-mentioned methods are all industrial grade or even reagent grade, and the price of raw materials is relatively expensive, resulting in higher production costs.
[0004] So far, there is no relevant report on the method of preparing basic aluminum ammonium carbonate whiskers and alumina whiskers using bentonite as raw material

Method used

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  • Method for preparing basic ammonium aluminum carbonate hydroxide whisker and aluminum oxide whisker co-production liquid sodium silicate from bentonite
  • Method for preparing basic ammonium aluminum carbonate hydroxide whisker and aluminum oxide whisker co-production liquid sodium silicate from bentonite
  • Method for preparing basic ammonium aluminum carbonate hydroxide whisker and aluminum oxide whisker co-production liquid sodium silicate from bentonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1, add the sulfuric acid solution that concentration is 20wt% to the bentonite mineral powder of particle diameter≤75 μ m, the mass ratio of bentonite mineral powder and sulfuric acid solution is 1: 5, react at 100 ℃ of temperature after 3h and filter to obtain acid leaching filter cake and Acid leaching filtrate, washing the acid leaching filter cake with clear water to neutrality, collecting acid leaching filter cake, acid leaching filtrate and lotion respectively;

[0048] 2. Mix the acid leaching filtrate obtained in step 1 and the lotion evenly to obtain a mixed solution, add 0.5% of the volume of the mixed solution to the mixed solution and have a mass concentration of 66% nitric acid solution, stir for 10 minutes, and then add the same volume of the mixed solution Isoamyl alcohol, shaken for 15min, let stand to separate layers, and collect the water phase to be the aluminum sulfate solution;

[0049] 3. Add 45mL of the aluminum sulfate solution obtained in step 2...

Embodiment 2

[0056] 1. Adding a sulfuric acid solution with a concentration of 40wt% to bentonite slag with a particle size of ≤100 μm, the mass ratio of bentonite slag and sulfuric acid solution is 1:4, react at a temperature of 95° C. for 4 hours and then filter to obtain acid leaching filter cake and For the acid leaching filtrate, the acid leaching filter cake is washed with clear water until neutral, and the acid leaching filter cake, acid leaching filtrate and washing liquid are collected respectively.

[0057] 2. Mix the acid leaching filtrate and lotion obtained in step 1 evenly to obtain a mixed solution, add a nitric acid solution with a mass concentration of 0.8% of the mixed solution volume to the mixed solution, stir and react for 8 minutes, and then add 0.5 times the mixed solution volume Isoamyl alcohol, shaken for 20min, let stand to separate layers, and collect the water phase, which is the aluminum sulfate solution.

[0058] 3. Add 45mL of the aluminum sulfate solution ob...

Embodiment 3

[0065] 1. Adding a sulfuric acid solution with a concentration of 50wt% to the bentonite slag with a particle size of ≤125 μm, the mass ratio of the bentonite slag and the sulfuric acid solution is 1:3, reacting at a temperature of 85° C. for 5 hours and then filtering to obtain acid leaching filter cake and For the acid leaching filtrate, the acid leaching filter cake is washed with clear water until neutral, and the acid leaching filter cake, acid leaching filtrate and washing liquid are collected respectively.

[0066] 2. Mix the acid leaching filtrate and washing liquid obtained in step 1 to obtain a mixed solution, add a nitric acid solution with a mass concentration of 1% of the volume of the mixed solution to the mixed solution, and stir for 5 minutes, then add 2 times the volume of the mixed solution Isoamyl alcohol, shaken for 10 minutes, let stand to separate layers, and collect the water phase, which is the aluminum sulfate solution.

[0067] 3. Add 45mL of the alum...

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Abstract

The invention discloses a method for preparing basic ammonium aluminum carbonate hydroxide whisker and aluminum oxide whisker co-production liquid sodium silicate from bentonite, which comprises the following steps of: adding sulfuric acid solution to bentonite mineral powder which is taken as an initial raw material; reacting; then performing filtering separation; collecting an acid-leached filtrate and acid-leached filter cakes; adding salpeter solution and isoamyl alcohol to the acid-leached filtrate; performing liquid separation and collecting an aqueous phase to obtain aluminum salt solution; adding urea and a surface active agent to the aluminum salt solution; reacting; then, separating, washing and drying to obtain basic ammonium aluminum carbonate hydroxide whiskers; and calcining the basic ammonium aluminum carbonate hydroxide whiskers to obtain aluminum oxide whiskers. Aluminum oxide and silicon dioxide which are required by the method disclosed by the invention respectively come from bentonite ore, and other industrial raw materials do not need to be adopted, so that the production cost can be effectively reduced. The method disclosed by the invention has the advantages that the recovery rate is high; the yield of the aluminum oxide in the bentonite can reach at least 90 percent; and the yield of the amorphous silicon dioxide can reach at least 95 percent.

Description

1. Technical field [0001] The invention relates to a method for preparing basic ammonium aluminum carbonate whiskers and aluminum oxide whiskers to co-produce liquid sodium silicate from bentonite, which belongs to the deep processing and comprehensive reuse of bentonite. 2. Background technology [0002] Bentonite is an important non-metallic mineral, and its main valuable elements are aluminum and silicon. my country's bentonite resources are very rich, with good quality and wide distribution, and have great comprehensive utilization value. In recent years, many literatures have reported its comprehensive development and utilization, such as using silicon in it to produce daily chemical additives instant sodium metasilicate, rubber reinforcing agent white carbon black, etc.; using aluminum in it to produce aluminum series Water purifiers (such as polyaluminum chloride, polyaluminum sulfate, polyaluminum silicate sulfate), chemical additives such as ultra-fine aluminum sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/20C30B29/10C01B33/32
Inventor 于少明黄伶俐
Owner HEFEI UNIV OF TECH
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