Optimization of dolomite dissolution in hydrochloric acid by changing the factors of acid concentration, pulp density, and temperature.

Magnesium has found wide applications in various industrial fields such as automotive, transportation, electronics, and military industries due to its suitable properties and light weight. Magnesium is often extracted from dolomite. One way is to extract magnesium by dissolving dolomite in acid. In this study, the dissolution of magnesium from dolomite in hydrochloric acid was investigated. An attempt has been made to investigate the effect of parameters such as acid concentration, temperature, and pulp density on extracting the maximum possible magnesium. For this purpose, the Box-Behnken design was used in the response surface methodology (RSM). This was implemented by Design Expert ۱۰ software. The results showed that with increasing temperature and acid concentration, more magnesium can be dissolved in the acid. However, higher pulp density leads to a decrease in extraction efficiency. Although concentrations above ۲ molar did not have much effect on the amount of magnesium extracted, the same was true for results above ۵۰ degrees. Therefore, it is possible to save on material and energy consumption by reducing the concentration and temperature of the solution to these two levels. Numerical optimization showed that if the acid concentration and temperature are set to the minimum possible values, the maximum recovery will be ۷۳.۸۶%, while under unrestricted conditions, ۱۰۰% recovery is possible. Based on these results, it can be checked whether this recovery efficiency is economical, considering the cost of raw materials and energy consumption.

کلیدواژه ها:

Optimization ، Box-Behnken ، Magnesium ، Dolomite ، Hydrochloric acid