Division 35

United Kingdom

BAT is to reduce HCl and HF emissions from the melting furnace by using one or a combination of the following techniques:

Technique^f1	Applicability
A description of the techniques is given in Sections 1.10.4 and 1.10.6.
(i) Selection of raw materials for the batch formulation with a low content of chlorine and fluorine	The technique is generally applicable within the constraints of the batch formulation and the availability of raw materials
(ii) Minimisation of the fluorine content in the batch formulation The minimisation of fluorine emissions from the melting process may be achieved as follows: minimising/reducing the quantity of fluorine compounds (e.g. fluorspar) used in the batch formulation to the minimum commensurate with the quality of the final product. Fluorine compounds are used to optimise the melting process, help fiberisation and minimise filament breakage substituting fluorine compounds with alternative materials (e.g. sulphates)	The substitution of fluorine compounds with alternative materials is limited by quality requirements of the product
(iii) dry or semi-dry scrubbing, in combination with a filtration system	The technique is generally applicable
(iv) wet scrubbing	The technique is generally applicable within technical constraints; i.e. need for a specific waste water treatment plant.

Table 25

BAT-AELs for HCl and HF emissions from the melting furnace in the continuous filament glass fibre sector

Parameter	BAT-AEL
The conversion factor reported in Table 2 (4,5 × 10^–3) has been applied.
The higher levels of the range are associated with the use of fluorine compounds in the batch formulation.
Parameter	mg/Nm³	kg/tonne melted glass^f2
Hydrogen chloride, expressed as HCl	< 10	< 0,05
Hydrogen fluoride, expressed as HF^f3	< 5 – 15	< 0,02 – 0,07

Annotations

f1: A description of the techniques is given in Sections 1.10.4 and 1.10.6.
f2: The conversion factor reported in Table 2 (4,5 × 10^–3) has been applied.
f3: The higher levels of the range are associated with the use of fluorine compounds in the batch formulation.