- Tytuł:
- Buffering of pulp pH and its influence on process water chemistry during iron ore flotation
- Autorzy:
-
Tang, Min
Xiao, Qingfei - Powiązania:
- https://bibliotekanauki.pl/articles/1446441.pdf
- Data publikacji:
- 2021
- Wydawca:
- Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
- Tematy:
-
pulp pH
buffering
water chemistry
mineral dissolution
iron oxide - Opis:
- It is inevitable for the occurrences of pulp pH buffering during pH control in flotation as the minerals with acidic/alkali properties tend to interact with pH modifiers and restore the pulp pH. This could result in some disturbing ions and alter the water/pulp chemistry. The purpose of this study was to identify the influences of pulp pH buffering on process water chemistry through a series of pH buffering tests, bench flotation experiments, ore dissolution tests, zeta potential measurement, and Xray diffraction (XRD) analysis. The built-up and distribution of the dominant cations in the process water from different locations in an industrial flotation system of the iron ore were analyzed and recorded by Inductively Coupled Plasma-Optical Emission (ICP-OES) at a period of about six months when the operations were stable. The data showed that a near five-minute buffer of pulp pH at a range from near 7.9 to 8.9 occurred before it reached a stable value. At this period, the dissolution of Ca/Mg from the iron ore was dominant. And, the pulp pH at a lower value tended to induce more dissolved $Ca^{2+}$ and $Mg^{2+}$ ions. These divalent cations seem to have different influences on the flotation properties of iron oxides at the same concentrations, indicating a positive effect on the recovery of iron oxides with the presence of $Mg^{2+}$ ions but an opposite effect if $Ca^{2+}$ ions occurred. The presence of sulfate, however, tended to restore the floatability of silicate depressed by $Ca^{2+}$ ions.
- Źródło:
-
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 157-167
1643-1049
2084-4735 - Pojawia się w:
- Physicochemical Problems of Mineral Processing
- Dostawca treści:
- Biblioteka Nauki
Artykuł