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

Chapter 1010.5 BAT for superphosphatesBAT 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 waste water treatment is to apply BAT given in [11, European Commission, 2003].BAT is to reduce dust emissions from rock grinding by application of, e.g. fabric filters orceramic filters and to achieve dust emission levels of 2.5 – 10 mg/Nm 3 (see Section 10.4.2).BAT is to prevent dispersion of phosphate rock dust by using covered conveyor belts, indoorstorage, and frequently cleaning/sweeping the plant grounds and the quay (see Section 5.4.8).BAT is to improve environmental performance of the finishing section by one or a combinationof the following techniques:• apply plate bank product cooling (see Section 7.4.5)• recycling of warm air (see Section 7.4.6)• select proper size of screens and mills, e.g. roller or chain mills• apply surge hoppers for granulation recycle control• apply online product size distribution measurement for granulation recycle control.BAT is to reduce fluoride emissions by application of scrubbers with suitable scrubbing liquidsand to achieve fluoride emission levels of 0.5 – 5 mg/Nm 3 expressed as HF (see Section 10.4.3).BAT is to reduce waste water volumes by recycling of scrubbing liquids, where, besides themanufacture of SSP or TSP, acidulated phosphate rock (PAPR) is also produced.BAT for production of SSP/TSP and multipurpose production is to reduce emissions to air fromneutralisation, granulation, drying, coating, cooling by applying the following techniques and toachieve the emission levels or removal efficiencies given in Table 10.7.• cyclones and/or fabric filters (see Sections 7.4.6 and 7.4.10)• wet scrubbing, e.g. combined scrubbing (see Section 7.4.10).ParameterNH 3Levelmg/Nm 35 – 30 xRemovalefficiency in %Neutralisation, granulation, drying, coating,coolingFluoride as HF1 – 5 xxDust 10 – 25 > 80HCl 4 – 23x the lower part of the range is achieved with nitric acid as the scrubbing medium, the upper part of the range isachieved with other acids as the scrubbing medium. Depending on the actual NPK grade produced (e.g. DAP),even by applying multistage scrubbing, higher emission levels might be expectedxx in the case of DAP production with multistage scrubbing with H 3 PO 4 , levels ofup to 10 mg/Nm 3 might be expectedTable 10.7: Emission levels to air associated with the application of BAT398 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers