Registration Dossier

Manufacture, use & exposure

Uses at industrial sites

Documentsopen allclose all

Uses at industrial sites

Contributing activity / technique for the environment
Name of activity / technique:
Use of tungstic acid to manufacture tungsten trioxide powder
Environmental release category (ERC):
ERC6a: Use of intermediate
Contributing activity / technique for workersopen allclose all
Name of activity / technique:
Step 1 - Raw material handling: Tungsyic acid powder is received and stored in sealed containers. The raw material is transferred through an automated loading system to the next step
Process category (PROC):
PROC 8a: Transfer of substance or mixture (charging and discharging) at non-dedicated facilities
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 2 - Loading the batch furnace: Tungstic acid is loaded manually into calcinations boats, which are transferred into the batch furnace
Process category (PROC):
PROC 4: Chemical production where opportunity for exposure arises
Name of activity / technique:
Step 3 - Calcination: Tungsten trioxide is produced by calcination of tungstic acid under oxidising conditions in a furnace. The furnace operates at approximately 700 °C
Process category (PROC):
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
Name of activity / technique:
Step 4 - Unloading the furnace and transfer to homogenisation operation: After calcination, the powder is unloaded from the furnace. The powder is collected in sealed metal containers
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 5 - Homogenisation: After calcination, the powder is blended in a tumbling mixer or a double cone blender to homogenise the tungsten trioxide. The homogenisation operation occurs in a closed system
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 6 - Unloading homogenisation unit and fill into metal containers: Emptying the homogenisation unit and filling powder into sealed metal containers
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 7 - Maintenance and cleaning: Various maintenance and cleaning operations inside and outside the equipment
Process category (PROC):
PROC28: Manual maintenance (cleaning and repair) of machinery
Product category used:
PC 7: Base metals and alloys
Sector of end use:
SU 14: Manufacture of basic metals, including alloys
SU 15: Manufacture of fabricated metal products, except machinery and equipment
Substance supplied to that use in form of:
as such
Subsequent service life relevant for this use:
no
Related assessment:
use assessed in a joint CSR

Uses at industrial sites

Contributing activity / technique for the environment
Environmental release category (ERC):
ERC6a: Use of intermediate
Contributing activity / technique for workers
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
PROC 4: Chemical production where opportunity for exposure arises
PROC 8a: Transfer of substance or mixture (charging and discharging) at non-dedicated facilities
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
Subsequent service life relevant for this use:
no

Uses at industrial sites

Contributing activity / technique for the environment
Environmental release category (ERC):
ERC6b: Use of reactive processing aid at industrial site (no inclusion into or onto article)
Contributing activity / technique for workers
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
PROC 4: Chemical production where opportunity for exposure arises
PROC 8a: Transfer of substance or mixture (charging and discharging) at non-dedicated facilities
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
Subsequent service life relevant for this use:
no

Uses at industrial sites

Contributing activity / technique for the environment
Name of activity / technique:
Use of tungstic acid based catalysts
Environmental release category (ERC):
ERC4: Use of non-reactive processing aid at industrial site (no inclusion into or onto article)
ERC6a: Use of intermediate
ERC6b: Use of reactive processing aid at industrial site (no inclusion into or onto article)
Contributing activity / technique for workersopen allclose all
Name of activity / technique:
Step 1: Catalyst delivery and handling - The substance is delivered and stored as a solution
Process category (PROC):
PROC 2: Chemical production or refinery in closed continuous process with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 2: Transfer of liquid raw material into production equipment - The liquid substance is pumped into production equipment
Process category (PROC):
PROC 4: Chemical production where opportunity for exposure arises
Name of activity / technique:
Step 3: Precipitation, Impregnation, Filtration, Drying and Mixing - The substance is used to prepare a supported catalyst system using classical catalyst preparation methods of precipitation and/or impregnation to disperse the substance on wet or dry carrier material. This is followed by filtration, drying, and mixing of the supported catalyst material
Process category (PROC):
PROC 2: Chemical production or refinery in closed continuous process with occasional controlled exposure or processes with equivalent containment conditions
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 4: Forming - Formation of shaped catalysts, for example, by extrusion
Process category (PROC):
PROC 14: Tabletting, compression, extrusion, pelletisation, granulation
Name of activity / technique:
Step 5: Calcination - The catalyst material is thermally treated by calcination at temperatures between 200 to 600°C in a closed system. During this process, the tungstic acid is converted to tungsten trioxide
Process category (PROC):
PROC 1: Chemical production or refinery in closed process without likelihood of exposure or processes with equivalent containment conditions
PROC 2: Chemical production or refinery in closed continuous process with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 6: Maintenance and cleaning - Various maintenance and cleaning operations inside and outside the equipment
Process category (PROC):
PROC28: Manual maintenance (cleaning and repair) of machinery
Product category used:
PC 20: Products such as ph-regulators, flocculants, precipitants, neutralisation agents
PC 0: Other: UCN P15500: catalyst
Sector of end use:
SU 8: Manufacture of bulk, large scale chemicals (including petroleum products)
SU 9: Manufacture of fine chemicals
Substance supplied to that use in form of:
in a mixture
Subsequent service life relevant for this use:
no
Related assessment:
use assessed in a joint CSR

Uses at industrial sites

Contributing activity / technique for the environment
Environmental release category (ERC):
ERC6a: Use of intermediate
Contributing activity / technique for workers
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
PROC 26: Handling of solid inorganic substances at ambient temperature
Subsequent service life relevant for this use:
no

Uses at industrial sites

Contributing activity / technique for the environment
Name of activity / technique:
Use of dihydrogen wolframate in the production of catalysts containing tungsten trioxide
Environmental release category (ERC):
ERC6b: Use of reactive processing aid at industrial site (no inclusion into or onto article)
Contributing activity / technique for workersopen allclose all
Name of activity / technique:
Step 1: Raw material handling
Process category (PROC):
PROC 8a: Transfer of substance or mixture (charging and discharging) at non-dedicated facilities
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 2: Loading the batch furnace
Process category (PROC):
PROC 4: Chemical production where opportunity for exposure arises
Name of activity / technique:
Step 3: Calcination
Process category (PROC):
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
Name of activity / technique:
Step 4: Unloading the furnace and transfer to homogenisation operation
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 5: Homogenisation
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 6: Unloading homogenisation unit and fill into metal containers
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 7: Maintenance and cleaning
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Product category used:
PC 7: Base metals and alloys
Sector of end use:
SU 8: Manufacture of bulk, large scale chemicals (including petroleum products)
SU 9: Manufacture of fine chemicals
SU 14: Manufacture of basic metals, including alloys
SU 15: Manufacture of fabricated metal products, except machinery and equipment
Substance supplied to that use in form of:
as such
Subsequent service life relevant for this use:
no
Related assessment:
use assessed in a joint CSR

Uses at industrial sites

Contributing activity / technique for the environment
Name of activity / technique:
Use of tungstic acid to manufacture ultrafine tungsten and tungsten carbide powders
Environmental release category (ERC):
ERC6a: Use of intermediate
Contributing activity / technique for workersopen allclose all
Name of activity / technique:
Step 1 - Transfer from drums to process metal containers: The tungstic acid powder is transferred from drums to process metal containers
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 2 - Furnace charging: The tungstic acid powder is filled manually or automatically into reduction boats for pusher furnaces or it is filled directly to a rotary furnace
Process category (PROC):
PROC 26: Handling of solid inorganic substances at ambient temperature
Name of activity / technique:
Step 3 - Reduction process: The tungsic acid powder is reduced to W metal powder in hydrogen atmosphere at approximately 1000°C either in pusher furnaces or rotary furnaces
Process category (PROC):
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
Name of activity / technique:
Step 4 - Sieving: The tungsten metal powder is sieved immediately after reduction and filled into closed containers
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 5 - Transfer to mixer: The tungsten metal powder is transferred from the transport containers into a mixer
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 6: - Homogenising: The tungsten metal powder is homogenised in a mixer
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 7 - Filling: The homogenised (and optional doped) tungsten metal powder is filled into closed containers
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 8: Transfer to mixer (ONLY for WC manufacture): tungsten metal powder is transferred from the transport containers into a mixer. Carbon black is filled into the mixer
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 9:- Blending (ONLY for WC manufacture): Mixing of tungsten metal powder with carbon black in a closed system
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
Name of activity / technique:
Step 10: Transfer to furnace (ONLY for WC manufacture): The powder blend is unloaded from the mixer and transferred to the furnace hopper. Alternatively, it is unloaded into special containers for batch carburisation. The W and C powder blend is fed into the furnace or furnace boats. Alternatively, the special containers are loaded into the batch furnace
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step11 - Carburisation or furnace operation (ONLY for WC manufacture): The W and C powder blend is carburized to WC at elevated temperature in the furnace in a protective atmosphere (eg, H2 or N2)
Process category (PROC):
PROC 22: Potentially closed processing operations with minerals/metals at elevated temperature. Industrial setting
Name of activity / technique:
Step 12 - Maintenance: Maintenance of production and ventilation equipment
Process category (PROC):
PROC28: Manual maintenance (cleaning and repair) of machinery
Product category used:
PC 7: Base metals and alloys
Sector of end use:
SU 9: Manufacture of fine chemicals
SU 14: Manufacture of basic metals, including alloys
SU 15: Manufacture of fabricated metal products, except machinery and equipment
Substance supplied to that use in form of:
as such
Subsequent service life relevant for this use:
no
Related assessment:
use assessed in a joint CSR

Uses at industrial sites

Contributing activity / technique for the environment
Environmental release category (ERC):
ERC4: Use of non-reactive processing aid at industrial site (no inclusion into or onto article)
ERC6a: Use of intermediate
ERC6b: Use of reactive processing aid at industrial site (no inclusion into or onto article)
Contributing activity / technique for workers
Process category (PROC):
PROC 1: Chemical production or refinery in closed process without likelihood of exposure or processes with equivalent containment conditions
PROC 2: Chemical production or refinery in closed continuous process with occasional controlled exposure or processes with equivalent containment conditions
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
PROC 4: Chemical production where opportunity for exposure arises
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
PROC 9: Transfer of substance or mixture into small containers (dedicated filling line, including weighing)
PROC 14: Tabletting, compression, extrusion, pelletisation, granulation
Subsequent service life relevant for this use:
no

Uses at industrial sites

Contributing activity / technique for the environment
Name of activity / technique:
Use of dihydrogen wolframate to produce catalysts
Environmental release category (ERC):
ERC6a: Use of intermediate
Contributing activity / technique for workersopen allclose all
Process category (PROC):
PROC 1: Chemical production or refinery in closed process without likelihood of exposure or processes with equivalent containment conditions
Process category (PROC):
PROC 2: Chemical production or refinery in closed continuous process with occasional controlled exposure or processes with equivalent containment conditions
Process category (PROC):
PROC 3: Manufacture or formulation in the chemical industry in closed batch processes with occasional controlled exposure or processes with equivalent containment conditions
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Process category (PROC):
PROC 9: Transfer of substance or mixture into small containers (dedicated filling line, including weighing)
Process category (PROC):
PROC 14: Tabletting, compression, extrusion, pelletisation, granulation
Product category used:
PC 19: Intermediate
Sector of end use:
SU 8: Manufacture of bulk, large scale chemicals (including petroleum products)
Substance supplied to that use in form of:
as such
Subsequent service life relevant for this use:
no
Related assessment:
use assessed in a joint CSR