Process for roasting and removing organic matters from gibbsite

By employing dry grinding and high-temperature roasting processes, combined with specific equipment and control parameters, the problem of removing organic matter and inorganic carbon from trihydrate bauxite has been solved, thereby improving the operating efficiency and product quality of alumina production equipment.

CN120922900APending Publication Date: 2025-11-11CPI GUIZHOU ZUNYI IND DEV CO LTD
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Patent Information

Application Number
CN202510945209.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

In alumina production, foreign trihydrate bauxite has a high organic content, which is difficult to remove efficiently using existing roasting processes. This results in material sticking to equipment, low production capacity, and incomplete removal of inorganic carbon, affecting the leaching rate and subsequent solution treatment.

Method used

By employing a dry powdering process and high-temperature calcination technology, combined with a nano-ceramic anti-stick coating, wear-resistant ceramic lining, oxygen-enriched air, and segmented temperature-controlled calcination, organic matter and inorganic carbon are simultaneously removed through ore mixing and strict control of temperature and residence time.

Benefits of technology

It effectively reduces the rate of mineral powder sticking to the wall, improves conveying efficiency, increases production capacity, removes organic matter and inorganic carbon, reduces the load of downstream solution salt discharge, and enhances the adaptability of the production system.

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Abstract

The invention relates to the technical field of organic matter removal, and provides a gibbsite organic matter roasting removal process which comprises the following steps: step 1, mixing foreign gibbsite and domestic diasporic bauxite according to a certain mass ratio; step 2, preparing mineral powder from the mixed ore in final grinding equipment by adopting a dry-method powder preparation process; 3, roasting treatment is conducted in a desulfurization furnace, and the temperature and the retention time of a main furnace reaction area are controlled; and 4, synchronously removing organic matters and inorganic carbon through high-temperature roasting. A nano ceramic anti-sticking coating with a certain thickness is adopted for a discharging port of the final grinding equipment, and the inclination angle of the mineral powder conveying equipment is optimized. The roasting desulfurization process is adopted. A nano ceramic anti-sticking coating with a certain thickness is used on a final grinding device, the inclination angle of a belt mineral powder conveying device is optimized, and a wear-resistant ceramic lining plate is used, so that the productivity is improved; dry-method powder preparation and roasting desulfurization equipment is used; organic matters and inorganic carbon are removed through high-temperature roasting, so that the salt discharge load is reduced by 30%, and the adaptability of mineral types is improved.
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