An H3O-alunite method for production of smelter grade alumina from an ammonium alum solution after high-pressure acid leaching of coal fly ash

IF 9.7 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2024-11-06 DOI:10.1016/j.jclepro.2024.144167

Dmitrii Valeev , Andrei Shoppert , Fengting Li

{"title":"An H3O-alunite method for production of smelter grade alumina from an ammonium alum solution after high-pressure acid leaching of coal fly ash","authors":"Dmitrii Valeev , Andrei Shoppert , Fengting Li","doi":"10.1016/j.jclepro.2024.144167","DOIUrl":null,"url":null,"abstract":"<div><div>Precipitation of H<sub>3</sub>O-alunite from an ammonium alum solution using boehmite as a seed was studied. The ammonium alum solution was obtained after high-pressure leaching of mullite-type coal fly ash (CFA) with a mixture of 7.5 M H<sub>2</sub>SO<sub>4</sub> + 40% NH<sub>4</sub>HSO<sub>4</sub> at 200 °C. Fe(III) was extracted from the ammonium alum solution by ion exchange sorption using the Purolite S957 resin. Effects of temperature (70–90 °C), seed boehmite (100–400 g/l), ammonium alum (60–240 g/l), and precipitation duration (2–8 h) on the Al precipitation degree were evaluated. Calcination of the precipitate at 300–950 °C to obtain alumina powder was studied next. Concentration of impurities, specific surface area, phase composition, morphology, and the average particle size distribution of alumina powders were investigated. The results show that smelter grade alumina (SGA) can be obtained at optimized parameters of precipitation and calcination.</div></div>","PeriodicalId":349,"journal":{"name":"Journal of Cleaner Production","volume":"481 ","pages":"Article 144167"},"PeriodicalIF":9.7000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Cleaner Production","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0959652624036163","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}

引用次数: 0

Abstract

Precipitation of H₃O-alunite from an ammonium alum solution using boehmite as a seed was studied. The ammonium alum solution was obtained after high-pressure leaching of mullite-type coal fly ash (CFA) with a mixture of 7.5 M H₂SO₄ + 40% NH₄HSO₄ at 200 °C. Fe(III) was extracted from the ammonium alum solution by ion exchange sorption using the Purolite S957 resin. Effects of temperature (70–90 °C), seed boehmite (100–400 g/l), ammonium alum (60–240 g/l), and precipitation duration (2–8 h) on the Al precipitation degree were evaluated. Calcination of the precipitate at 300–950 °C to obtain alumina powder was studied next. Concentration of impurities, specific surface area, phase composition, morphology, and the average particle size distribution of alumina powders were investigated. The results show that smelter grade alumina (SGA) can be obtained at optimized parameters of precipitation and calcination.

Abstract Image

查看原文本刊更多论文

利用高压酸浸煤粉灰后的铵矾溶液生产冶炼级氧化铝的 H3O-Alunite 方法

研究了以沸石为种子从铵矾溶液中沉淀出 H3O-alunite 的过程。铵矾溶液是用 7.5 M H2SO4 + 40% NH4HSO4 的混合物在 200 °C 下高压浸出莫来石型粉煤灰 (CFA) 后得到的。使用 Purolite S957 树脂通过离子交换吸附法从铵矾溶液中提取铁（III）。评估了温度（70-90 °C）、沸石种子（100-400 克/升）、铵明矾（60-240 克/升）和沉淀持续时间（2-8 小时）对铝沉淀度的影响。接下来研究了在 300-950 °C 下煅烧沉淀物以获得氧化铝粉末的情况。研究了氧化铝粉末的杂质浓度、比表面积、相组成、形态和平均粒度分布。结果表明，在优化沉淀和煅烧参数的情况下，可以获得冶炼级氧化铝（SGA）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Cleaner Production 环境科学-工程：环境

CiteScore

20.40

自引率

9.00%

发文量

4720

审稿时长

111 days

期刊介绍： The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.