The calcium phosphate slag is commercially known as:

Thomas' slag

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Baeyer's slag

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Wohler's slag

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Matte

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Solution

The correct option is A Thomas' slag
In the Bessemerisation of cast iron:
$P_{2} O_{5}$ formed from P combines with lime and forms basic slag $C a_{3} (P O_{4})_{2} . C a O$ , which is known as Thomas' slag.

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