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Method for detecting content of active silicon in bauxite

A determination method and technology for bauxite, which can be applied in the direction of removing certain components for weighing, preparation of test samples, etc., and can solve the problem of no content determination method.

Active Publication Date: 2014-10-22
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although active silicon has been defined, how to operate it specifically and how to test the content of this indicator, at present, there is no method for determining the content of this indicator in the existing bauxite method standards in my country

Method used

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  • Method for detecting content of active silicon in bauxite
  • Method for detecting content of active silicon in bauxite
  • Method for detecting content of active silicon in bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a kind of content assay method of active silicon in bauxite, its steps are as follows:

[0030] (1) Accurately weigh 0.2g of bauxite sample into a microwave digestion tank, add 20mL of AR grade sodium hydroxide solution with a mass concentration of 80g / L, and microwave at 0-145°C for 25min;

[0031] (2) Take it off after cooling, transfer it into a beaker, filter it with slow filter paper, wash it with AR grade sodium hydroxide solution with a mass concentration of 8g / L for 4 times, and keep the filtrate A and the insoluble residue respectively;

[0032] (3) Move the insoluble residue into the original beaker, add 18mL of hydrochloric acid solution, and place it on the electric heating plate for leaching; the hydrochloric acid solution is AR grade, and the hydrochloric acid solution is formed by mixing concentrated hydrochloric acid and water with a volume ratio of 1:1.5;

[0033] (4) Remove and filter, wash 4 times with hydrochloric acid solution, and kee...

Embodiment 2

[0039] Embodiment 2, a kind of content determination method of active silicon in bauxite, its steps are as follows:

[0040] (1) Accurately weigh 0.5g of bauxite sample into a microwave digestion tank, add 25mL of AR grade sodium hydroxide solution with a mass concentration of 120g / L, and microwave at 0-145°C for 40min;

[0041] (2) Take it off after cooling, transfer it into a beaker, filter it with slow filter paper, wash it with AR grade sodium hydroxide solution with a mass concentration of 12g / L for 6 times, and keep the filtrate A and the insoluble residue respectively;

[0042] (3) Move the insoluble residue into the original beaker, add 25 mL of hydrochloric acid solution, and place it on a heating plate for leaching; the hydrochloric acid solution is AR grade, and the hydrochloric acid solution is formed by mixing concentrated hydrochloric acid and water with a volume ratio of 1: 2.5;

[0043] (4) Take off and filter, wash 6 times with hydrochloric acid solution, get ...

Embodiment 3

[0049] Embodiment 3, a kind of content determination method of active silicon in bauxite, its steps are as follows:

[0050] (1) Accurately weigh 0.2-0.5g of bauxite sample into a microwave digestion tank, add 20-25mL of AR grade sodium hydroxide solution with a mass concentration of 100g / L, and microwave at 0-145°C for 30min;

[0051] (2) Take it off after cooling, transfer it into a 250mL beaker, filter it with slow filter paper, wash it with AR grade sodium hydroxide solution with a mass concentration of 10g / L for 4-6 times, and keep the filtrate A and the insoluble residue respectively;

[0052] (3) Move the insoluble residue into the original beaker, add 20mL of hydrochloric acid solution, and place it on the electric heating plate for leaching; the hydrochloric acid solution is of AR grade, and the volume ratio concentration is 1+2;

[0053] (4) Take off the filter, wash with hydrochloric acid solution for 4-6 times, and keep the filtrate B; the hydrochloric acid solutio...

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Abstract

The invention discloses a method for detecting content of active silicon in bauxite. The method comprises the following steps: processing a bauxite sample by using a microwave digestion method, putting the processed bauxite sample into a beaker, filtering, adding residual slag containing insoluble substances into hydrochloric acid for dipping and combining with a previous filtrate, evaporating the mixture on an electric heating plate, adding perchloric acid for desilicification, filtering and burning at high temperature, subsequently calculating mass fraction of the active silicon in the bauxite sample. According to the method for detecting content of active silicon in bauxite, a relative standard deviation (RSD) is less than 2% and a standard sample recovery rate is greater than 97%; compared with a foreign estimated value, the analysis data is basically consistent, and the method has an accurate and reliable result.

Description

technical field [0001] The invention relates to a content determination method, in particular to a method for determining active silicon content in bauxite by microwave digestion gravimetric method. Background technique [0002] Bauxite is an earthy mineral with the chemical composition Al 2 o 3 ·nH 2 O, with variable water content. Most of the alumina contained is monohydrate or trihydrate mineral, and a small part of alumina is in the form of silicate. [0003] The aluminum-silicon ratio is commonly used for bauxite quality evaluation, that is, the mass percentage of alumina and silica in bauxite. Generally speaking, bauxite with a high aluminum-silicon ratio is generally called high-quality and high-grade bauxite because of its high alumina content and low gangue mineral content, which is conducive to saving energy and reducing consumption in alumina production. However, in practical applications, the index for evaluating the quality of bauxite is mainly the content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N1/44
Inventor 张晓梅单连勇徐会会
Owner BLUESTAR LEHIGH ENG INST CO LTD
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