Study on Pyrolysis Characteristics of Phosphate Tailings under H2O Atmosphere
Yanping Yang, Yu Zhang, Dengpan Nie, Chenxin Sun, Jianxin Cao
TL;DR
This study explores how phosphate tailings decompose under a water atmosphere, improving efficiency and product reactivity.
Contribution
The paper introduces a novel medium-temperature pyrolysis method using H2O atmosphere for phosphate tailings.
Findings
Pyrolysis in H2O atmosphere reduces decomposition temperature to 500°C and shortens time to 30 minutes.
Decomposition yields of MgO and CaO reached 97.3% and 98.1%, with MgO reactivity at 31.6%.
Post-pyrolysis, Ca and Mg no longer form associated compounds and exist in distinct forms.
Abstract
The pyrolysis separation of calcium and magnesium from phosphate tailings is an important process due to its high-value resource utilization. In this paper, aiming to address the problems of high energy consumption, a slow decomposition rate and the low activity of decomposition products in the high-temperature pyrolysis of phosphate tailings, the medium-temperature pyrolysis of phosphate tailings under a H2O atmosphere was carried out, and the phase reconstruction and activation of pyrolysis process were discussed. The results showed that compared with N2, air and CO2 atmospheres, the pyrolysis process of phosphate tailings in a H2O atmosphere was changed from two stages to one stage, the starting decomposition temperature was reduced to 500 °C and the decomposition time was shortened to 30 min. The order of the influence of each factor on the pyrolysis of phosphate tailings was…
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Taxonomy
TopicsTailings Management and Properties · Magnesium Oxide Properties and Applications · Iron oxide chemistry and applications