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| Quality Control of Alkali Dissolution - Carbonation Precipitation Process for Alumina Producing |
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Received:October 13, 2021
Revised:October 13, 2021
Accepted:October 21, 2021
Published Online:January 18, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.02.007 |
| KeyWord:carbonization; desilication; roasting; aluminum hydroxide; alumina; quality control |
| Author | Institution |
| MA Ke-you |
济源职业技术学院 |
| WANG Hong-wei |
济源职业技术学院 |
| ZHANG Xue-ying |
济源职业技术学院 |
| DONG Kai-wei |
东北大学 |
| MA Jing-wei |
广西大学 |
| PAN Xiao-lin |
东北大学 |
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| Abstract: |
| Alkali dissolution - carbonation precipitation process for alumina producing is a new process, which equilibrium of Na2O-A12O3-H2O system in Bayer process is broken and production efficiency is enhanced significantly. Applying sodium aluminate solution leached by NaOH solution as raw materials, effects of desilication from sodium aluminate solution, decomposition of sodium aluminate with sodium bicarbonate, carbonization with sodium bicarbonate, and aluminum hydroxide roasting process on quality of products were investigated. The results show that quality of first-stage aluminum hydroxide meets or close to the standard of the first grade under the suitable conditions of twice purification desilication with lime (desilication temperature of about 98 ℃, first stage purification time of 1 h with lime addition of 15 g/L, and second stage purification time of 1 h with lime addition of 10 g/L), and two-stage decomposition of sodium aluminate solution (decomposition temperature of 90 ℃, concentration of sodium bicarbonate solution of 90~100 g/L, decomposition time of first stage of 8—10 h, total decomposition time of 16 h below, and decomposition ratio first stage of about 85%). The quality of alumina products of aluminum hydroxide calcined at 1 200~1 250 ℃ can reach the requirements of second grade products. |
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