Registration Dossier

Manufacture, use & exposure

Manufacture

Documentsopen allclose all

Manufacture

Contributing activity / technique for the environment
Name of activity / technique:
Manufacture of tungstic acid powder
Environmental release category (ERC):
ERC1: Manufacture of the substance
Contributing activity / technique for workersopen allclose all
Name of activity / technique:
Step 1: Raw material handling: Ammonium paratungstate (APT) powder is received and stored in sealed containers. APT is transferred to a mill.

Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 2: Milling: ammonium paratungstate (APT) is ground in a mill
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 3: Filling of APT: Milled ammonium paratungstate is filled into drums
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 4: Preparing the reaction solution: The ammonium paratungstate is decanted into a stirred reactor by an automated drum decanting system and suspended with water. The nitric acid is metered continuously into the reactor (directly pumped) by a closed, automated feed system. The result of this process is a tungstic acid suspension

Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 5: Precipitation step: The suspension of tungstic acid is pumped into another vessel and stirred until precipitation / crystallisation has finished
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: Filtration of tungstic acid: The suspension of tungstic acid is filtered by a band filter and washed
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 7: Drying of tungstic acid: The press cake of tungstic acid is transferred to a revolving silo and subsequently relayed to a spray dryer where it is dried. The dry substance is transferred to a silo
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 8: Packaging of tungstic acid: The dried tungstic acid is filled into containers from the silo
Process category (PROC):
PROC 26: Handling of solid inorganic substances at ambient temperature
Name of activity / technique:
Step 9: Mixing and packaging of tungstic acid: 3 – 4 containers of tungstic acid are homogenised in a mixer and subsequently packaged
Process category (PROC):
PROC 26: Handling of solid inorganic substances at ambient temperature
Name of activity / technique:
Step 10: Quality control: Finished tungstic acid powder is sampled for analysis
Process category (PROC):
PROC 15: Use as laboratory reagent
Name of activity / technique:
Step 11: Maintenance and cleaning: Various maintenance and cleaning operations inside and outside the equipment
Process category (PROC):
PROC28: Manual maintenance (cleaning and repair) of machinery
Related assessment:
use assessed in a joint CSR

Manufacture

Contributing activity / technique for the environment
Name of activity / technique:
Manufacture of tungstic acid based catalysts
Environmental release category (ERC):
ERC1: Manufacture of the substance
Contributing activity / technique for workersopen allclose all
Name of activity / technique:
Step 1: Raw material delivery and handling
Process category (PROC):
PROC 2: Chemical production or refinery in closed continuous process 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
Name of activity / technique:
Step 2: Catalyst production
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 14: Tabletting, compression, extrusion, pelletisation, granulation
PROC 27b: Production of metal powders (wet processes)
Name of activity / technique:
Step 3: Catalyst packaging
Process category (PROC):
PROC 8b: Transfer of substance or mixture (charging and discharging) at dedicated facilities
Name of activity / technique:
Step 4: Maintenance and cleaning
Process category (PROC):
PROC 2: Chemical production or refinery in closed continuous process with occasional controlled exposure or processes with equivalent containment conditions
PROC28: Manual maintenance (cleaning and repair) of machinery
Name of activity / technique:
Step 5: catalyst storage
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
Related assessment:
use assessed in a joint CSR