Utilization of Nitric Acid Wastes from Bleaching Earth Production

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• 作者：L&aacute ; szló ; Kó ; tai ; Bé ; la Kazinczy ; Istv&aacute ; n G&aacute ; cs ; Kl&aacute ; ra Szentmih&aacute ; lyi ; &Aacute ; gnes Keszler ; and Krisztina Sz&aacute ; sz
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：October 2000
• 年：2000
• 卷：39
• 期：10
• 页码：3920 - 3925
• 全文大小：165K
• 年卷期：v.39,no.10(October 2000)
• ISSN：1520-5045

文摘

Nitric acid activation of bentonite has been studied with the aim of harmonizing bleaching earthand ammonium nitrate fertilizer production, where the latter is obtained from waste acid vianeutralization with ammonia. In this paper, a mathematical model is described for compositionmeasurement of the waste acid formed during the activation of the bentonite. On the basis ofthe results obtained from the model, the amount of concentrated nitric acid necessary forrefreshing the recycled acidic solution can easily be estimated. The amounts of the productsformed during ammoniacal neutralization, such as ammonium nitrate, hydroxides of hydrolizablemetals, and nitrates of nonhydrolizable metals, as well as the amount of activated bentonite,can also be calculated. It is established that, with an increase in the recycling number, theactivation process becomes more economical via decreasing energy and material requirements.