山东省地下卤水型溴矿资源利用现状评价及高效开发建议

Evaluation on Present Condition of Utilization and Suggestions for Efficient Use of Bromine of Underground Brines in Shandong Province

地下卤水不仅是食盐的重要来源,同时富含Br、Bi、Sr、Li、K、Ba等几十种化学元素,是一种重要的矿产资源。山东省地下卤水(盐、溴)矿主要呈条带状分布在环渤海湾沿岸黄河三角洲平原区、莱州湾南岸平原区和胶州湾西北岸,分布面积约为3003.11km^(2),推断资源量807734.3万m^(3),可采量28721.9万m^(3)/a。山东省地下卤水资源开发历史悠久,主要采用溴盐联产方式回收盐和溴两种资源,采用卤水→溴素→原盐、卤水→溴素→原盐→苦卤回收→盐化工产品等开发工艺。现阶段,地下卤水型溴矿资源开发利用企业全部位于潍坊市,共有51家生产企业。本次工作采用资料收集、统计分析、综合研究等手段对矿山企业开发利用水平进行了评价,平均采收率为77.9%,总体达到部最低三率指标要求,但有26个矿山溴矿平均采收率为75.2%,采收率偏低。通过对影响采收率水平的因素进行相关性分析,建立了入厂溴离子浓度和尾液溴离子浓度拟合方程,认为将入厂溴离子浓度控制在140g/m3,控制尾液溴离子浓度在25~30g/m^(3),有利于提升溴矿利用水平,减少资源浪费。同时提出了高效利用资源和加强监管的意见建议。

Underground brine is not only an important source of table salt,but also rich in dozens of chemical elements such as Br,Bi,Sr,Li,K,Ba,etc.It is an important mineral resource.The underground brine(salt,bromine)mines in Shandong province are mainly distributed in strips along the Yellow River Delta plain area along the Bohai Bay,the southern plain area of Laizhou Bay,and the northwest coast of Jiaozhou Bay,with a distribution area of approximately 3003.11 km^(2).The inferred resource amount is 807734.3×10^(4)m^(3),and the recoverable amount is 28721.9×10^(4)m^(3)/a.The development of underground brine resources in Shandong province has a long history,mainly using bromine salt co production to recover salt and bromine resources.The development process includes brine→bromine→raw salt,brine→bromine→raw salt→bittern recovery→salt chemical products.At present,all enterprises engaged in the development and utilization of underground brine type bromine ore resources are located in Weifang city,with a total of 51 production enterprises.This work used methods such as data collection,statistical analysis,and comprehensive research to evaluate the development and utilization level of mining enterprises.The average recovery rate is 77.9%,which overall met the minimum three rate index requirements of the department.However,there are 26 mines with bromine mines with an average recovery rate of 75.2%,indicating a low recovery rate.By conducting correlation analysis on the factors affecting the recovery rate,a fitting equation was established for the concentration of incoming bromine ions and the concentration of tail liquid bromine ions.It is believed that controlling the concentration of incoming bromine ions at 140g/m^(3) and the concentration of tail liquid bromine ions at 25~30g/m^(3) is beneficial for improving the utilization level of bromine ore and reducing resource waste.At the same time,suggestions are put forward for efficient utilization of resources and strengthening supervision.