Method for synchronously preparing sodium aluminate through aluminum ash soda sintering denitrification

A technology of sodium aluminate and aluminum ash, applied in the fields of mineral processing and non-ferrous metallurgy, can solve the problems of secondary pollution, high production cost, complicated process, etc., and achieve the effects of low cost, simple operation and low energy consumption

Active Publication Date: 2019-06-25
CENT SOUTH UNIV
2 Cites 9 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] Aiming at the defects of high production cost, complex process, and easy to produce secondary pollution in the comprehensive utilization process of aluminum ash in the prior art, the purpose of the present invention is to provide a method of using aluminum ash as a raw material and controlling the temperature and atmosphere to soda A method of high-temperature sintering to efficiently remove impurity elements and obtain sodium aluminate simultaneously....
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Abstract

The invention discloses a method for synchronously preparing sodium aluminate through aluminum ash soda sintering denitrification. The method comprises the steps that aluminum ash and mixed sodium salt prepared from sodium carbonate, sodium bicarbonate and sodium peroxide are mixed evenly, and pressed into agglomerates; the agglomerates are dried and sequentially placed in an air atmosphere to besubjected to first-section low-temperature roasting and placed in a strong-oxidizing atmosphere to be subjected to second-section intermediate-temperate roasting, roasted products are cooled and crushed, and then leached out by an alkaline solution, and thus a sodium aluminate solution is obtained. According to the method, industrial waste residue is utilized as a main raw material, the raw material source is wide, the cost is low, the aluminum recovery rate is high, operation is easy, the production cost is low, the environmental friendly effect is achieved, and industrial production requirements are met.

Application Domain

Alkali-metal aluminates/aluminium-oxide/aluminium-hydroxide preparation

Technology Topic

Air atmosphereSodium carbonate +10

Examples

  • Experimental program(4)
  • Comparison scheme(3)

Example Embodiment

[0024] Example 1:
[0025] Take the aluminum ash (aluminum content 58.6%, nitrogen content 8.3%) of an aluminum metallurgical plant as raw materials, first mix the aluminum ash and the mixed sodium salt according to the aluminum-sodium element ratio of 1:1.1, and the mixed sodium salt ratio is sodium carbonate and carbonic acid The mass ratio of sodium hydrogen and sodium peroxide is 85:17:8. The raw materials are mixed and pressed into agglomerates with a diameter of 15mm; after the agglomerates are fully dried, they are placed in an air atmosphere for a period of roasting, and the roasting temperature is 500℃. The roasting time is 120min, the roasting atmosphere is air; the second-stage roasting temperature is 700℃, the roasting time is 120min, and the roasting atmosphere is O 2 /(O 2 +N 2 )=40%; after calcination, the cooled agglomerates are crushed, immersed in an alkaline solution, and solid-liquid separated to obtain a sodium aluminate solution. In the whole process, the aluminum recovery rate is 92.3%, the nitrogen removal rate is 98.3%, and the ratio of nitrogen element converted into nitrogen is 99.3%.

Example Embodiment

[0026] Example 2:
[0027] Take the aluminum ash (aluminum content 58.6%, nitrogen content 8.3%) of an aluminum metallurgical plant as raw materials, first mix the aluminum ash and the mixed sodium salt according to the aluminum-sodium element ratio of 1:1.3, and the mixed sodium salt ratio is sodium carbonate and carbonic acid The mass ratio of sodium hydrogen and sodium peroxide is 70:25:5. The raw materials are mixed and pressed into agglomerates with a diameter of 15mm; after the agglomerates are fully dried, they are placed in an air atmosphere for a period of roasting, and the roasting temperature is 300℃. The roasting time is 180min, the roasting atmosphere is air; the second-stage roasting temperature is 875℃, the roasting time is 150min, and the roasting atmosphere is O 2 /(O 2 +N 2 )=65%; after calcination, the cooled agglomerates are crushed, immersed in an alkaline solution, and solid-liquid separated to obtain a sodium aluminate solution. In the whole process, the aluminum recovery rate was 94.2%, the nitrogen removal rate was 99.0%, and the ratio of nitrogen element converted into nitrogen was 98.8%.

Example Embodiment

[0028] Example 3:
[0029] Take the aluminum ash (aluminum content 58.6% and nitrogen content 8.3%) of an aluminum metallurgical plant as raw materials. First, the aluminum ash and the mixed sodium salt are mixed according to the aluminum-sodium element ratio of 1:1.2, and the mixed sodium salt ratio is sodium carbonate and carbonic acid The mass ratio of sodium hydrogen and sodium peroxide is 70:17:13. The raw materials are mixed and pressed into agglomerates with a diameter of 15mm; after the agglomerates are fully dried, they are placed in an air atmosphere for a period of roasting at a roasting temperature of 500°C. The roasting time is 150min, the roasting atmosphere is air; the second-stage roasting temperature is 850℃, the roasting time is 180min, and the roasting atmosphere is O 2 /(O 2 +N 2 )=55%; after the roasting, the cooled agglomerates are crushed, immersed in an alkaline solution, and solid-liquid separated to obtain a sodium aluminate solution. In the whole process, the aluminum recovery rate was 95.1%, the nitrogen removal rate was 98.8%, and the ratio of nitrogen element converted to nitrogen was 99.2%.

PUM

PropertyMeasurementUnit
Diameter15.0mm

Description & Claims & Application Information

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