Dissolution profile of dolomite in chloric acid solution: The effect of chloric acid concentration and pulp density

Abstract

Abstract. Dolomite is one of carbonate minerals that contain magnesium. Magnesium is important element used in many aspects of life such as cofactor of many enzymes in human body, nutrient for plants, and raw material in automotive industry. Dolomite can be processed through low temperature process to obtain magnesium and calcium oxide that is needed in important applications such as base material for making drugs, raw material in the synthesize slow release fertilizer, materials for fire retardant, component for catalyst, etc. One of the important step of this low temperature process is dissolution of dolomite. Optimizing the dissolution process determines the % extraction of magnesium and calcium oxide from dolomite. The dissolution of dolomite from Gresik, East Java Provence Indonesia, in chloric acid solution has been conducted. Chloric acid concentration and pulp density are the variables that were observed. The dissolution of magnesium and calcium from Gresik dolomite was found to be very fast. The stable stage of dissolution can be reached for 5-10 seconds. The % extraction is mainly determined by the molar ratio of chloric acid / dolomite. At molar ratio of chloric acid / dolomite equal or above stoichiometric of dolomite dissolution, % extraction of magnesium is almost 100 %.

Kinetic Study of Reaction between Dolomite Ore and Trioxonitrate (V) Acid (HNO3)

“…[2] SCM was chosen based on the assumption that dolomite particles are spherical. The linearization of a plot of fractions of dolomite that reacted at various HNO3 concentration and reaction temperature with the corresponding time were examined under the three SCM Equations ( 10), ( 11) and (12). The experimental data were tested for first line of best fits, which is also the slowest step as well as the rate determining step.…”

“…Dolomite is one of the major sources of magnesium oxide (MgO) which is currently in high demand [9,10]. MgO can be used as catalyst, refractory lining, in drug making and fertilizer production [11,12]. In order to understand the reaction mechanism between dolomite and mineral acids, such as hydrochloric acid (HCl), tetraoxosulphate (VI) acid (H2SO4) and trioxonitrate (V) acid (HNO3), the study of dissolution kinetics was considered.…”

Recovery of magnesium sulfate from a zinc ore flotation tailing using hydrometallurgical route.

“…Basic scheme of the flotation process (Gupta, 2003) (Putnis, 1995); b) Molecular structure of dolomite (Solihin et al, 2018) (D'Ans, 1933;Kay, 1969;Podder and Kalkura, 2001;Robson, 1927, Wanderley et al, (2020. Adapted from Wanderley et al, (2020) (Sinclair, 2005).…”

“…There are three oxygen atoms bonded to the carbon in covalent bonds. The dolomite molecules are formed due to the ionic bond between the positive charge of Mg and Ca, and the two negative charges of carbonate (Solihin et al, 2018).…”

“…Figure 7 a) Crystalline structure of dolomite, crystallized in the rhombohedral system (Putnis, 1995); b) Molecular structure of dolomite (Solihin et al, 2018).…”