我国铸造用原砂蕴藏量丰富,但尚未被各地区就近进行调查开发。就西北地区来说,有的生产铸件工厂,仍采用定点的东北标准原砂和中南地区原砂。这样长途运输很不经济。鉴于这种状况,为寻找地区性高质量原砂,在1964年调查的基础上,于1979年又一次对宁夏地区铸造用原砂进行调查,共检查20多个砂源点。现将主要砂源点的原砂经过取样、化验、分析、检测和实物试验,供铸件生产工厂选用参考。调查研究的结果见附表。通过对宁夏地区铸造用原砂的初步调查,说明了我国质量较好的铸造用原砂蕴藏量相当丰富。表中所列宁夏地区原砂,经过取样化验、分析,基本上都可用于铸铁件生产,有的可直接开采使用。有的只要采用水洗、精选分级、烘干等工序加工生产,均可满足近代铸造高标准要求。其中较好的是固原地区天然硅砂 China has a rich foundry sand inventory, but it has not yet been investigated and developed by all localities. In the case of the northwestern region, some production of castings factories still use the designated northeast standard raw sand and the Central South China original sand. This long-distance transport is not economical. In view of this situation, in order to find regional high-quality raw sand, on the basis of the 1964 survey, another investigation was conducted on the foundry sand used in Ningxia in 1979, and a total of more than 20 sand source sites were inspected. Now the main source of sand sand after sampling, testing, analysis, testing and in-kind tests for the casting production plant selection reference. The results of the investigation see the attached table. Through the preliminary investigation of foundry sand in Ningxia, it shows that the reserves of foundry sand with good quality in our country are quite rich. The original sand in the Ningxia region listed in the table can be used for the production of cast iron after sampling and analysis and analysis, and some can be directly mined. Some as long as the use of washing, sorting, drying and other processes of production, can meet the high standards of modern foundry requirements. Which is better natural Guyuan sand area