Method for designing continuous titration chemical analysis scheme of sodium aluminate solution

A technology of sodium aluminate and solution, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observing the influence of chemical indicators, which can solve the problems of no performance advantage

Inactive Publication Date: 2013-04-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This error is comparable to the traditional chemical analysis method widely used in our country, and does not show obvious advantages

Method used

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  • Method for designing continuous titration chemical analysis scheme of sodium aluminate solution
  • Method for designing continuous titration chemical analysis scheme of sodium aluminate solution
  • Method for designing continuous titration chemical analysis scheme of sodium aluminate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment specifically illustrates the design of a chemical analysis scheme suitable for the scientific research process according to the content of the invention.

[0041] The sodium aluminate solution experimental condition and sampling standard that embodiment is aimed at are as shown in table 7:

[0042] Table 7 Experimental conditions and sampling standards of the scientific research process

[0043]

[0044] According to attached figure 2 The flow chart shown is used to design a chemical analysis scheme suitable for the scientific research process: (1) The sampling standard of the above sodium aluminate solution analysis sample is equivalent to 2×(1 / 5)=0.4 ml of the sodium aluminate stock solution, that is, at the initial The concentration of sodium aluminate solution analysis sample contains about 0.4×2.5=1.0 mmol of Al, and about 0.4×4=1.6 mmol of total alkali. (2) According to the present invention, the EDTA standard solution adopts a 20 ml grade A ...

Embodiment 2

[0053] This example specifically illustrates the design of a chemical analysis scheme suitable for the production process based on the content of the invention.

[0054] The sodium aluminate solution production condition that embodiment is aimed at and sampling standard are as shown in table 10:

[0055] Table 10 Production conditions and sampling standards of the production process

[0056]

[0057]The production process adopts a chemical analysis scheme different from that of the scientific research process, and its determination method is as follows: ① The sampling standard for the analysis sample in the production process is 2.0 ml of sodium aluminate stock solution, that is, the amount of Al in the analysis sample of the initial concentration of sodium aluminate solution The content is about 2.0×2.5=5.0 mmol, and the content of total alkali is about 2.0×4.0=8.0 mmol. Compared with the chemical analysis in the scientific research process, the sampling volume of the ana...

Embodiment 3

[0066] This example specifically illustrates the practical application of the continuous titration chemical analysis scheme for each component of the sodium aluminate solution proposed by the present invention.

[0067] According to the present invention, the chemical analysis scheme adopted in the example is shown in Table 13, and the specific steps of the analysis operation are as described in Example 1. The actual error of the chemical analysis scheme is shown in Table 14, and the results show that the maximum error of the chemical analysis is about 0.6%. Compared with the traditional chemical analysis scheme, the overall analysis error is greatly reduced.

[0068] Table 13 The chemical analysis scheme actually used in a scientific research process

[0069]

[0070] Table 14 The actual error of the chemical analysis scheme actually used

[0071]

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Abstract

The invention provides a method for designing a continuous titration chemical analysis scheme of a sodium aluminate solution, and belongs to the field of chemical analysis methods of component contents in an aluminum industrial production process. The method for designing the continuous titration chemical analysis scheme of the sodium aluminate solution is mainly characterized by comprising the following steps of: carrying out sample analysis on a plurality of sodium aluminate solution analysis samples differing in caustic ratio variation range by respectively applying a plurality of ethylene diamine tetraacetic acid (EDTA) standard solutions differing in concentration value; in a process of adding a certain amount of EDTA standard solutions into the sodium aluminate solution analysis samples, constantly keeping the proportion of the added excessive EDTA within 0-1 / 3 of the total amount; and in an analysis process, controlling the total concentration of various chemical components of the sodium aluminate solution analysis samples generally not lower than 0.01mol / L and controlling the minimum not lower than 0.001mol / L. Meanwhile, the invention provides two sets of improved schemes applicable to the chemical analysis in scientific research and production processes; and in comparison with the conventional analysis scheme which is about 3% in maximum analysis error, the maximum analysis errors of the improved schemes are just about 0.6%.

Description

technical field [0001] The invention belongs to the field of chemical analysis methods for chemical components in the aluminum industry production process, and mainly relates to a continuous titration chemical analysis method for the components and parameters of sodium aluminate solution total alkali, alumina, caustic ratio and the like in the process of alumina production and scientific research. Background technique [0002] Sodium aluminate solution is a very important intermediate product in the production process of alumina Bayer process, the main composition is NaOH-NaAl(OH) 4 -H 2 O, and throughout the entire production process. Accurate analysis of the chemical composition of the solution is of great significance to the scientific research and production process of the entire alumina industry, but there is no corresponding national or international standard so far. For many years, my country's aluminum factories have generally adopted a traditional "acid-base neutr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 周俊
Owner HUNAN UNIV
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