Method for producing metallurgy-grade alumina by taking pulverized fuel ash and recycled ammonium salt as raw materials
A technology for the production of metallurgy and fly ash, applied in the direction of alumina/aluminum hydroxide, solid waste removal, etc., can solve the problems of large entrainment of ammonium sulfate, increased alkali consumption, long aging time, etc. The effect of reducing the amount of entrainment, reducing the amount of evaporated water, and facilitating the dissolution and reuse
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0039] Example 1: A method for producing metallurgical grade alumina using fly ash and recyclable ammonium salts as raw materials, which includes the following steps: (1) material preparation; (2) roasting; (3) dissolution; (4) crystallization; (5) Liquid-solid ammonolysis; (6) Grinding and desulfurization; (7) Low-temperature Bayer aluminum; among them,
[0040] (1) Material preparation: Grind and activate the fly ash, and grind it to 150 meshes. According to the molar ratio of alumina and ammonium sulfate contained in the fly ash of 1:3.5, the ground fly ash and ammonium sulfate Uniformly mixed, and then mixed with water to granulate to form granular materials, and the mass ratio of the mixture of the fly ash and the ammonium sulfate to the water is 100:3;
[0041] (2) Roasting: the granular material is roasted at 390°C for 3 hours, and roasting clinker and ammonia gas are produced during roasting;
[0042] (3) Dissolution: The roasting clinker is dissolved in ammonium sulfate sol...
Example Embodiment
[0047] Embodiment 2: A method for producing metallurgical grade alumina using fly ash and recyclable ammonium salts as raw materials, which includes the following steps: (1) material preparation; (2) roasting; (3) dissolution; (4) crystallization; (5) Liquid-solid ammonolysis; (6) Grinding and desulfurization; (7) Low-temperature Bayer aluminum; among them,
[0048] (1) Material preparation: Grind and activate fly ash, grind it to 400 mesh, and mix the ground fly ash with ammonium bisulfate in a ratio of 1:7 in the molar ratio of alumina and ammonium bisulfate contained in the fly ash Uniformly mixed, and then mixed with water to granulate to form granular materials, the mass ratio of the mixture of the fly ash and the ammonium bisulfate to the water is 100:8;
[0049] (2) Roasting: The granular material is roasted at 450°C for 2 hours, and roasting produces roasted clinker and ammonia gas.
[0050] (3) Dissolution: The roasting clinker is dissolved with ammonium sulfate solution wi...
Example Embodiment
[0055] Example 3: A method for producing metallurgical grade alumina using fly ash and recyclable ammonium salts as raw materials, which includes the following steps: (1) material preparation; (2) roasting; (3) dissolution; (4) crystallization; (5) Liquid-solid ammonolysis; (6) Grinding and desulfurization; (7) Low-temperature Bayer aluminum; among them,
[0056] (1) Preparation: Grind and activate fly ash, and grind it to 300 meshes. According to the molar ratio of alumina and ammonium bisulfate contained in fly ash 1:4.5, the ground fly ash and ammonium bisulfate Uniformly mixed, and then mixed with water to granulate to form granular materials, and the mass ratio of the mixture of the fly ash and the ammonium bisulfate to the water is 100:5;
[0057] (2) Roasting: the granular material is roasted at 400° C., and the roasting time is 1.7 hours. The roasting produces roasted clinker and ammonia gas.
[0058] (3) Dissolution: The roasting clinker adopts ammonium sulfate solution wit...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap