| 1. | CaCO3 formed is passed to another vessel ( the calciner ).
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| 2. | It is likely that these replaced the old reverberatory furnace and calciner.
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| 3. | In 1917 a Merton calciner was erected and flues for arsenic recovery constructed.
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| 4. | In the calciner, some of the recovered CO 2 is recycled through the system.
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| 5. | Calcination is an endothermic process and as such requires the application of heat to the calciner.
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| 6. | Some oxygen may also be passed through the reactor if fuel is being burned in the calciner to provide energy.
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| 7. | Direct provision of heat involves the combustion of fuel in the calciner itself ( air separation processes are being developed.
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| 8. | A calciner dating from 1910 1913 when the mine was reopened, roasted the tin to remove impurities such as arsenic.
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| 9. | Indirect methods are generally less efficient but do not require the provision of oxygen for combustion within the calciner to prevent dilution.
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| 10. | A solid purge heat exchanger can also be utilized to recover energy from the deactivated CaO and coal ashes from the calciner.
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