Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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The production process as it was built in Poland, had to be re-calculated and a mass and heat balance was created to identify potential for optimization. The majority of the columns and absorption towers within the existing plant could be directly scaled up with good engineering practice. Size limitations did not apply for any of this equipment. However, the mass and heat balance revealed that the Hydrofluoric acid generation section could be optimized with regards to the recovery of HF. Further, a liquefaction and purification section had to be designed to suit the process and achieve the required concentrations of HF and impurities levels. So, construction should depending on the location and output.

Detailed program was following: While the process “Hydrofluoric acidF from FSA” was scaled up in one step and with a factor of 25, there are limitations that make it difficult to build single line plants with capacities higher than 30,000 t/a. The reason is mainly due to difficulty of applying the material of construction for larger sizes of a few key equipment. Some equipment that is used in the process have to be custom made from special materials. Building these as large single piece of equipment is expensive and increases the manufacturing time. This prevents the construction of plants with capacities comparable to large single line AHF plants (with fluorspar as raw material) of 53,000 t/a. A possible block type layout for a production plant with higher capacity, 54,000 t/a. The HF reaction plant section and the FSA concentration section are doubled for some parts where the size is getting too large for the used materials of construction. Especially lined columns and heat exchangers do have maximum sizes that prevent larger single line plants. Maintenance and purchasing costs would be too large when a single production line of this size would be built. The purification section on the other hand, could be built in a single line. BCT has experience with purification and condensation of AHF of that size. The same is for the storage tanks. It depends on the customers’ requirements on safety and storage capacity. 

The optimized process should concern about the least amount of material handling, space and architectural space is fully utilized, flexible enough long-term development, working conditions, safety, convenience and comfort, production management science, timely transmission of information and etc.. The optimized process flows within the Hydrofluoric acid and STF generation section brought improvements in the overall fluorine recovery from the columns. In addition, the efficiency of the FSA concentration section was increased and the loss of STF to the off gas scrubber could be minimized. Due to HF is very dangerous, Engineering controls should be concern, closed operation, attention to ventilation, safety shower and eyewash equipment. Respiratory protection: when it is possible exposure to fumes, wear self-absorption filter respirators (full cover) or air respirator. Emergency rescue or evacuation, recommended to wear oxygen respirator.