Distribution and mode of occurrence of radionuclides in phosphogypsum derived from Aqaba and Eshidiya Fertilizer Industry,South Jordan

Phosphogypsum (PG) is a by-product of the chemical reaction called the "wet process" whereby sul-phuric acid reacts with phosphate rock (PR) to produce phosphoric acid, needed for fertilizer production. Through the wet process, some impurities naturally present in the PR become incorporated in PG, including U decay-series radionuclides, are the main important concern which could have an effect on the surrounding environment and pre-vent its safe utilization. In order to determine the distribution and bioavailability of radionuclides to the surrounding environment, we used a sequential leaching of PG samples from Aqaba and Eshidiya fertilizer industry. The results showed that the percentages of 226Ra and 210Pb in PG are over those in the corresponding phosphate rocks (PG/PR), where 85% of the 226Ra and 85% of the 210Pb fractionate to PG. The sequential extraction results exhibited that most of 226Ra and 210Pb are bound in the residual phase (non-CaSO4) fraction ranging from 45%–65% and 55%–75%, respectively, whereas only 10%–15% and 10%–20% respectively of these radionuclides are distributed in the most labile fraction. The results obtained from this study showed that radionuclides are not incorporated with gypsum itself and may not form a threat to the surrounding environment.     

皖东地区毛山金矿蚀变矿物特征及其地质意义

毛山金矿属于中小规模金矿山。通过对矿体两侧的黄铁绢英岩进行热分析与透射电镜观察研究以及对绢云母的热分析及其化学成分研究，认为水热蚀变、硅化及矿化程度均较高，成矿热液可能来自矿区南部和深部，该地区是寻找隐伏矿体的靶区。黄铁绢英岩中出现微细石膏，反映在成矿过程中可能出现过氧化阶段，是出现富矿的显示。进而提出乳白色石英脉中出现石膏晶体是寻找金矿化的新的找矿标志。     

临澧合口矿区硬石膏水化（带）特征及水化石膏的开发前景

本文阐述了临澧县合口矿区硬石膏矿层浅部水化石膏带的分布，深度与矿石特征和成因，并对水化石膏的开采条件和经济价值作了评估。     

邵东县城石膏矿老采空区地面变形原因及防治对策

本文从邵东县城石膏矿老采空区地面变形的情况入手，对地面变形的原因进行了分析，并对变形趋势进行了预测，在此基础上从行政和技术角度提出了防治对策。     

从开采石膏矿废弃物中回收石膏的工艺流程研究

石膏矿开采过程中抛弃的大量膏泥，尚含有部分石膏。本文从试验结果出发，论述通过简单的“擦洗－脱泥”工艺流程，可回收供水泥工业用的石膏，变废为宝，缓解石膏供应紧张矛盾，具有一定的现实意义。     

反浮选-冷结晶法生产氯化钾浮选法除钙研究

研究了青海察尔汗盐湖水采光卤石矿生产氯化钾工艺中浮选除钙的方法。实验结果表明,分级浮选法除钙率平均达88.16%,接近原矿的理论可除钙离子量91.58%。     

邯邢式铁矿成矿条件及找矿方向

邯邢式铁矿为我国一大类型铁矿床，它有一定的赋存条件，有一定的地层位置，因此也有较适合其成矿规律的找矿方向，本文对邯邢式铁矿的地质特征、成矿规律有一定认识，指出邯邢式铁矿找矿方向。