Hematite Solubility in Reducing Conditions

Solubility tests were executed to quantify the dissolution pace of hematite under diverse circumstances. A spectrum of variables was subjected to test, encompassing reducing agent concentration (upto 10 wt.%), temperature (within the range of 50–125 °C), and treatment duration (extending up to 24 h). In each trial, a mass of 4 g of the weighting material (Hematite powder) was immersed in 100 cm³ of the acid solution, subject to specified conditions and duration. Subsequent to testing, the residual hematite was separated through vacuum-assisted filtration, followed by desiccation. By ascertaining the post-test weight, solubility was computed utilizing Eq. (1). The solubility experimental setup is illustrated in Fig. 14 in the Appendix. $$Solubility\left(w,t,.,\%\right)=\frac{originalhematiteweight-remaininghematiteweight}{\mathit{originalhematiteweight}}\times 100\%$$