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一、概况我国江西、广东等省蕴藏有极为丰富的希土矿资源。赋存状态呈风化离子吸附型矿床,有利于开采提取。希土组份既有轻、重希土共存的矿床,也有比较集中的重希土矿床。早在五十年代,美国已推广应用希土球墨铸铁,并得到较决的发展。我国开展得虽稍迟一些,但自包钢大量产出轻希土硅铁合金后,全国已有近千个用户,球铁产量每年达二十余万吨。七十年代初期,江西龙南、寻邬、赣县等希土资源已着手开发。一般以粗制品含总希土90%、钇60～70%的氧化物出售。继后
I. Overview China’s Jiangxi Province, Guangdong and other provinces contain extremely rich in resources of the earth and stone mines. Presence of weathering ion adsorption deposits, is conducive to mining extraction. Rely components both light and heavy mineral deposits, but also have a relatively heavy heavy mineral deposits. As early as the fifties, the United States has promoted the use of nodular cast iron and received more decisive development. Although a little later in our country, a large quantity of light-earth ferrosilicon has been produced from Baotou Steel. There have been nearly 1,000 users throughout the country. The output of ductile iron reaches more than 200,000 tons annually. In the early seventies, Jiangxi Longnan, Xunwu, Gan County and other local resources have begun to develop. Generally crude products containing total 90% of the earth, yttrium oxide 60 to 70% for sale. Following