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Method for processing sodium oxalate crystallized from industrial sodium aluminate solution

An industrial sodium aluminate, crystallized technology, applied in the field of sodium oxalate, can solve the problems of increasing production costs, polluting the environment, etc., and achieve the effects of low price, environmental friendliness, and energy consumption reduction

Inactive Publication Date: 2012-05-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for alumina plants with sintering process, but alumina plants using Bayer process have no sintering process, so the processing of crystallized sodium oxalate requires an additional calcination process, which not only increases production costs, but also pollutes the environment

Method used

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  • Method for processing sodium oxalate crystallized from industrial sodium aluminate solution
  • Method for processing sodium oxalate crystallized from industrial sodium aluminate solution
  • Method for processing sodium oxalate crystallized from industrial sodium aluminate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 500mL of self-prepared sodium hydroxide solution, 25g of sodium oxalate (oxalate content is 32.84g / L), and 1.0g (2g / L) of copper oxide are added to the autoclave. The volume of oxygen is 0.05Nm 3 ~1Nm 3 / kg sodium oxalate; feed air at 2MPa, stir, and react at 260°C for 4.5h. The content of oxalate in the solution after catalytic oxidation was 1.61g / L, and the oxidation rate of sodium oxalate was 95.11%.

Embodiment 2

[0033] 500mL of self-prepared sodium hydroxide solution, 20g of sodium oxalate (oxalate content is 26.27g / L), and 0.4g (0.8g / L) of copper oxide are added to the autoclave, and the oxygen volume is 0.05Nm 3 ~1Nm 3 / kg sodium oxalate; feed air at 2MPa, stir, and react at 260°C for 4h. The content of oxalate in the solution after catalytic oxidation was 2.11g / L, and the oxidation rate of sodium oxalate was 91.95%.

Embodiment 3

[0035] 500mL of self-prepared sodium hydroxide solution, 50g of sodium oxalate (oxalate content is 65.67g / L), and 0.8g (1.6g / L) of copper oxide are added to the autoclave, and the oxygen volume is 0.05Nm 3 ~1Nm3 / kg sodium oxalate; feed air at 2MPa, stir, and react at 260°C for 6h. The oxalate content in the solution after catalytic oxidation was 0.37g / L, and the oxidation rate of sodium oxalate was 99.43%.

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Abstract

The invention discloses a method for processing sodium oxalate crystallized from an industrial sodium aluminate solution. The method comprises the steps of: adding crystallized sodium oxalate into an alkaline solution; regarding Cu2+ as a catalyst; and oxidizing by an oxygen-containing gas at a high temperature until oxidation efficiency of the sodium oxalate is above 80%. The method disclosed by the invention does not need high temperature calcination and over-high energy consumption, is environment-friendly as no CO2 gas is discharged, is efficient and obvious in oxidation effect and simple in process, and thereby has good industrial application foreground.

Description

technical field [0001] The invention relates to a method for removing sodium oxalate crystallized from industrial sodium aluminate solution, especially suitable for aluminum oxide enterprises that use crystallization to remove sodium oxalate in circulating mother liquor due to high sodium oxalate content. Crystallized sodium oxalate. Background technique [0002] Bauxite is stripped after grinding, and along with the stripping of alumina, the organic matter in the ore also enters the sodium aluminate solution. With the increase of its production time, organic matter such as humic acid will be decomposed into sodium oxalate. As the sodium oxalate in the circulating sodium aluminate solution slowly accumulates, the content is getting higher and higher. During the decomposition process of species, sodium oxalate and The co-crystallization of aluminum hydride affects the output and quality of alumina products. In recent years, the problem of high sodium oxalate content in a few ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00
Inventor 陈文汨付云枫
Owner CENT SOUTH UNIV
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