铸造材料

请问铸造中必须都要用到石英砂来做砂型吗？还是有别的工艺不用到石英砂？

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请问铸造中必须都要用到石英砂来做砂型吗？还是有别的工艺不用到石英砂？
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石英砂最便宜，而且能满足一般铸造要求，如果有特殊需要的话，可以采用特种砂，如镁砂，锆英砂，橄榄石砂
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石英砂最便宜
特种砂太贵
一般特种铸造不用石英砂
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