Firm has shut down unit because of worker's unrest.
Plan could lay off a further 156 people.
Sáenz de Miera will replace Juan Bejar at the head of Spanish cement maker.
This is the second time the plant has been attacked.
Some names have already been bandied about to take the helm of the Irish building materials firm.
Some 200 people protested at Le Havre port saying imports endanger local jobs.
Opposition legislators are demanding a judicial inquiry into accident that killed five people.
Police had arrested 18 workers at Alexandria based plant because of unrest.
Workers at Cemex Egypt went on strike to protest non payment of dividends.
Portuguese cement maker says 150 workers leaving the company.
Bill seeks to cut cement bags in half to 25 kg per.
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