Device and process for removing oxalate in sodium aluminate solution

A technology of medium oxalate and removal device, which is applied in the purification of aluminate/alumina/aluminum hydroxide, the preparation of alkali metal aluminate/alumina/aluminum hydroxide, and the aluminum compound, etc., can solve the problem of decomposing foam. , the problem of high alkali consumption and loss of products

Active Publication Date: 2021-02-02
湖南诺兰蒂尔环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the Bayer process, the organic matter that enters the system with the ore circulates in the process with the solution. When these impurities repeatedly pass through the high-pressure stripper, the impurities in the solution gradually decompose from high-molecular compounds to low-molecular compounds, and finally form oxalic acid. Sodium, sodium carbonate and other low-molecular-weight sodium salts, and accumulate in the process cycle, thereby adversely affecting the production of alumina and product quality
The existence of sodium oxalate leads to the following problems: increased alkali consumption, product refinement, more decomposition foam and difficult operation, high alkali consumption of products
The advantage of this method is that the process is relatively simple and the production is easy to realize. However, a large amount of alumina in the seed washing liquid is lost during the causticization of oxalate, and at the same time, a large amount of seed washing water is consumed, which brings heavy burden to the evaporation and sedimentation process. burden

Method used

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  • Device and process for removing oxalate in sodium aluminate solution
  • Device and process for removing oxalate in sodium aluminate solution
  • Device and process for removing oxalate in sodium aluminate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In a constant temperature water bath shaking device, place 6 groups of 500mL conical beakers, put 250mL decomposition mother liquor in each beaker, add 1, 5, 15, 25, 35, 45g / L yttrium oxalate and 100ppm crystal growth chitosan, the oscillation frequency is 30 Hz, react at a temperature of 60 °C for 2 hours, use a vacuum filtration device to quickly separate the solid from the liquid, and analyze the Na in the filtrate 2 o T (N T ), Al 2 o 3 (AO), Na 2 o k (N K ), Na 2 o C (N C ), Na 2 C 2 o 4 (C 2 o 4 2- ), the experimental results are shown in Table 1.

[0059] Table 1. Embodiment 1 experimental result

[0060]

[0061] It can be seen from Table 1 that as the addition of yttrium oxalate inducer gradually increased from 1g / L, the concentration of oxalate in the sodium aluminate solution decreased gradually after the reaction, and the concentration of oxalate dropped from 2.03g / L to 0.98g / L; When the addition amount is more than 25g / L, the amount of o...

Embodiment 2

[0063] Place 6 sets of 500mL conical beakers in a constant temperature water bath shaking device, put 250mL decomposition mother liquor in each beaker, add 10g / L yttrium oxalate, cerium oxalate, lanthanum oxalate or their mixture and 100ppm crystal growth agent Chitosan, the oscillation frequency is 30Hz, after reacting at a temperature of 70°C for 6 hours, the solid-liquid separation is carried out quickly with a vacuum filtration device, and the Na in the filtrate is analyzed 2 o T 、Al 2 o 3 、Na 2 o k 、Na 2 o C 、Na 2 C 2 o 4 , the experimental results are shown in Table 2.

[0064] Table 2. Embodiment 2 experimental results

[0065]

[0066]

[0067] It can be seen from Table 2 that adding 10 g / L rare earth oxalate as a crystal inducer in the sodium aluminate solution has a significant effect on inducing the crystallization of sodium oxalate. After the reaction, the concentration of oxalate in the sodium aluminate solution dropped from 2.03 g / L to 0.96 g / L; ...

Embodiment 3

[0069] In a constant temperature water bath oscillation device, place 6 groups of 500mL conical beakers, put 250mL decomposition mother liquor in each beaker, add 10g / L yttrium oxalate, and add 50ppm dextran and chitosan with a molecular weight of about 2 million Sugar, aminopolysaccharide, pullulan, rhamnose, and a mixture of dextran and rhamnose with a mass ratio of 1:1, the oscillation frequency is 30Hz, react at a temperature of 40°C for 1 hour, and then vacuum filter The device quickly performs solid-liquid separation and analyzes Na in the filtrate 2 o T 、Al 2 o 3 、Na 2 o k 、Na 2 o C 、Na 2 C 2 o 4 , the particle size of the filter cake was analyzed with a laser particle size analyzer, and the experimental results are shown in Table 3.

[0070] Table 3. Embodiment 3 experimental results

[0071]

[0072] It can be seen from Table 3 that the addition of 50ppm polysaccharide polymer in the sodium aluminate solution has a significant effect on promoting the gro...

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Abstract

The invention discloses a device and a process for removing oxalate in a sodium aluminate solution. The device comprise three parts, namely an oxalate reaction growth system, a grading system and a solid-liquid separation system. The process comprises the following steps: firstly, adding an oxalate growth agent, the sodium aluminate solution in an aluminum oxide production section and an oxalate inducer into a reaction tank; performing stirring to separate out oxalate in the form of large-particle agglomerates so as to obtain reaction slurry; pumping the reaction slurry into a grader for grading to obtain underflow and overflow; and finally, respectively carrying out solid-liquid separation on the underflow and the overflow to remove oxalate in the sodium aluminate solution. The method isshort in technological process, economical and feasible, and has a good industrial popularization prospect.

Description

technical field [0001] The invention relates to an oxalate removing device and process in a sodium aluminate solution. The invention belongs to the technical field of alumina production. Background technique [0002] The production of alumina by the Bayer method has the advantages of simple process, low energy consumption, good product quality, and low cost. Therefore, more than 95% of the alumina in the world is currently produced by the Bayer method. However, in the Bayer process, the organic matter that enters the system with the ore circulates in the process with the solution. When these impurities repeatedly pass through the high-pressure stripper, the impurities in the solution gradually decompose from high-molecular compounds to low-molecular compounds, and finally form oxalic acid. Sodium, sodium carbonate and other low-molecular-weight sodium salts are accumulated in the process, which adversely affects the production of alumina and product quality. The existence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/47
CPCC01F7/473Y02P10/20
Inventor 金立业罗春成林娟胡林
Owner 湖南诺兰蒂尔环保科技有限公司
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