sand making machine appeared , sand making machine appears to solve the problem of environmental protection and the needs of gravel , sand making machine is broken after the rubble after primary and secondary crushing during the formation of sand. Produced through the sand making machine sand -type uniform mechanism for practical good. Many countries have a lot of sand and gravel mines and gravel , but lack of sand resources , sand making machine to make up the appearance of a lack of resources but also make full use of these gravel , to prevent the waste of resources. With economic development , ecological and environmental construction requirements, so that resources are depleting natural sand ; while China’s growing infrastructure projects , so that sand came into being. Requirements for building sand is also increasing. Also due to excessive exploitation of natural sand sources on the environment caused by the increasing pressure , so use sand production has become a trend.
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原文地址：http://www.cnblogs.com/cssandy/p/3824436.html
