Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

Chapter 66.5 BAT for hydrofluoric acidBAT is to apply the common BAT given in Section 1.5.BAT for storage is to apply BAT given in [5, European Commission, 2005].BAT for the fluorspar process is to apply a combination of the following techniques and toachieve fuel consumption levels within the ranges given in Table 6.14:• preheating the feed H 2 SO 4 (see Figure 6.2 and Section 6.4.1)• optimised kiln design and optimised temperature profile control for the rotary kiln (seeSection 6.4.1)• using a pre-reactor system (see Figure 6.2 and Section 6.4.1)• energy recovery from kiln heating (see Section 6.4.2)• spar calcination (see Figure 6.2 and Sections 6.4.1and 6.4.5).Fuel for kiln heatingGJ/tonne HFRemark4 – 6.8 Existing installations4 – 54.5 – 6New installations, production ofanhydrous HFNew installations, production ofanhydrous HF and HF solutionsTable 6.14: Achievable consumption levels associated with BAT for the production of HFBAT for the treatment of tail gases from the fluorspar process is to apply e.g. water scrubbingand/or alkaline scrubbing and to achieve the emission levels given in Table 6.15 (see Sections6.4.6 and 6.4.7).kg/tonne HF mg/Nm 3 RemarkSO 2 0.001 – 0.01Yearly averagesFluorides as HF 0.6 – 5Table 6.15: Achievable emission levels associated with BAT for the production of HFBAT is to reduce dust emissions from fluorspar drying, transfer and storage and to achieve dustemission levels of 3 – 19 mg/Nm 3 (see Section 6.4.8).Split view: Part of industry claims that the dust emission levels are not achievable, becausechanging the bags in the applied fabric filters more than once a year would not be economicallyviable.BAT is to treat waste water from wet scrubbing by applying a combination of the followingtechniques (see Section 6.4.9):• neutralisation with lime• addition of coagulation agents• filtration and optionally sedimentation.BAT for the fluorspar process is to market the generated anhydrite and fluosilicic acid, and, ifthere is no market, to dispose of it, e.g. by landfilling.282 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers