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Desilication method for sodium aluminate solution with high concentration

A sodium aluminate, high-concentration technology, applied in the purification of aluminate/alumina/aluminum hydroxide, the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the limitation of alumina sodium aluminate solution. Concentration, inability to produce sodium aluminate semen, etc., to achieve the effect of improving seed activity, reducing pressure, and saving steam

Active Publication Date: 2006-08-02
中铝中州铝业有限公司
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AI Technical Summary

Problems solved by technology

However, the desilication of high-concentration sodium aluminate solution has always restricted the further improvement of the concentration of alumina in sodium aluminate solution.
The reason is that when the concentration of sodium aluminate solution is increased, the stability of silicon is significantly improved, especially when the concentration of alumina is 130-180g / l, the traditional desiliconization by pressure cooking and normal pressure desiliconization with milk of lime or CAAC cannot Sodium aluminate semen with a silicon content index above 600 is produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The alumina concentration of the sodium aluminate solution is 130g / l, and the caustic ratio of the solution is 1.43. Silicon slag seed activation conditions: temperature 85°C, time 20 minutes, solid content 300g / l. Pre-desilication conditions: temperature 95°C, time 120 minutes, stirring, seed weight 60g / l. The silicon content index of the sodium aluminate solution after pre-desilication is 155. The pressure cooking desiliconization time is 45 minutes, the pressure cooking desiliconization temperature is 160° C., and the silicon content index of sodium aluminate after pressure cooking desiliconization is 450. Normal pressure desiliconization conditions: temperature 95°C, time 1 hour, stirring. The silicon content index after desiliconization under normal pressure is 620.

Embodiment 2

[0017] The alumina concentration of the sodium aluminate solution is 150g / l, and the caustic ratio of the solution is 1.53. Silicon slag seed activation conditions: temperature 90°C, time 50 minutes, solid content 200g / l. Pre-desilication conditions: temperature 95°C, time 120 minutes, stirring, seed weight 100g / l. The silicon content index of the sodium aluminate solution after pre-desilication is 180. The pressure cooking desiliconization time is 45 minutes, the pressure cooking desiliconization temperature is 160° C., and the silicon content index of sodium aluminate after pressure cooking desiliconization is 510. Normal pressure desiliconization conditions: temperature 95°C, time 2 hours, stirring. The silicon content index after desiliconization under normal pressure is 750.

Embodiment 3

[0019] The alumina concentration of the sodium aluminate solution is 180g / l, and the caustic ratio of the solution is 1.51. Silicon slag seed activation conditions: temperature 95°C, time 60 minutes, solid content 220g / l. Pre-desilication conditions: temperature 98°C, time 150 minutes, stirring, seed weight 100g / l. The silicon content index of the sodium aluminate solution after pre-desilication is 185. The pressure cooking desiliconization time is 45 minutes, the pressure cooking desiliconization temperature is 160° C., and the silicon content index of sodium aluminate after pressure cooking desiliconization is 525. Normal pressure desiliconization conditions: temperature 98°C, time 2 hours, stirring. The silicon content index after desiliconization under normal pressure is 735.

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Abstract

Disclosed is a de-silicon method from high concentration sodium aluminate solution which consists of, charging evaporated mother liquor into the pressed and boiled silicon slag for activating, agitating, charging activated silicon slag into the sodium aluminate as seeds, elevating the temperature to 90-95 deg. C, stabilizing de-silicon liquid alpha#-[k]=1.4-1.53, stirring and carrying out 2.5-3 hours of pre-desiliconization reaction, charging lime milk into the pre-desiliconized sodium aluminate for constant pressure desiliconization.

Description

technical field [0001] A method for desiliconization of high-concentration sodium aluminate solution. The invention relates to a sodium aluminate solution in the process of producing alumina by a sintering method, especially a desiliconization method of a high-concentration sodium aluminate solution. Background technique [0002] Crude liquid A1 after clinker dissolution in the traditional sintering alumina production process 2 o 3 The concentration is generally controlled at about 120g / l~128g / l, and its SiO 2 The concentration is generally about 4.5g / l. The desiliconization is carried out by using the traditional pressure cooking desiliconization process and the normal pressure desiliconization process. The silicon content index of the sodium aluminate solution after pressure cooking and desiliconization is about 400. The silicon content index of the sodium aluminate solution after desiliconization under normal pressure by CAAC can reach more than 600. With the developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/46C01F7/47
Inventor 郭声昆刘祥民李小斌程裕国赵东峰娄东民李海明武福运李太昌葛忠民刘国红任云翔杨长付韩黎明孙建锋岑永涛张永纪
Owner 中铝中州铝业有限公司
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