There are mainly two types of ores & witherite and barite-witherite . The former is better than the later in ore quality .

矿石类型主要有毒重石型和重晶石& 毒 重石型两类，前一类质量较优。

Study of preparating barium chloride by witherite

用 毒 重石制备氯化钡工艺研究

Mathematical Model of Witherite Decomposing Process

毒 重石 钡 矿分解过程的数学模型研究

The test results show that the reaction process of decomposition of witherite with nitric acid is the typical mass-transfer control process in which the hydrogen ion diffuses through liquid film .

结果表明：硝酸分解 毒 重石的反应过程是典型的氢离子通过液膜的传质控制的反应过程。

The macro-kinetics characteristics of decomposition of witherite with nitric acid in a batch reactor are studied .

研究了在间歇反应器中，用硝酸分解 毒 重石宏观动力学特性。

The natural barium carbonate is called witherite commonly .

毒 重石又称天然碳酸钡。

Liquid barium chloride was produced by one-step process from witherite and self-produced hydrochloric acid with no needs of some procedures such as evaporation crystallization centrifuge and drying .

以 毒 重石、自产盐酸为原料，一步法合成了液体氯化钡，省去了蒸发、结晶、离心、干燥等工序。

Macro-kinetics study on decomposition of witherite with nitric acid

硝酸分解 毒 重石宏观动力学研究

Witherite deposits belong to stratabound deposits of hot water sedimentation .

毒 重石矿床属热水沉积成因层控矿床。

It is indicated that the mode is capable of describing the decomposition reaction of witherite .

模型结果表明： 毒 重石 钡 矿分解反应可用 缩 核模型描述，反应过程存在控制区的 转移；

There are3 barium deposit zones distributed in Qinba mountain area they are witherite deposit zone in the south barite deposit zones in the north and middle .

秦巴山区钡资源丰富，钡矿床（重晶石、 毒重石）分3带：南带为 毒 重石 矿带，北带与中带为重晶石矿带。

Based on the traditional ore geochemistry studies in this paper we use modern analysis technologies ( GC-MS ESEM ) to explore the organic geochemistry characters and ore-forming environment of the witherite deposits .

本文在传统地球化学分析的基础上，借助GC&MS、 ESEM等现代测试技术，对矿床有机地球化学问题进行探讨。

Kinetic model study on the decomposition of witherite at 700 ~ 1000 ℃

毒 重石在700~1000℃下的热分解动力学模型研究

The geologic feature of Sinian witherite mineralized belt in Zhenba Chengkou

镇巴&城口震旦系 毒 重石成矿带地质特征

According to the structural characteristics and pyrolytic properties of witherite an core shrinking mathematical model is developed for witherite decomposition based on single interface core shrinking model . By numerical calculation it is found that the calculated data accord with the experimental results .

根据 毒 重石 钡 矿的结构特点和热解特性，基于单界面缩核模型建立了毒重石钡矿分解过程的缩核模型，并利用所建模型进行数值解析，计算结果与实验结果基本吻合。

Decomposition Properties of Witherite Mineral in High Temperature

毒 重石 钡矿高温分解特性

According to the regional tectonic-sedimentary evolution the formation of witherite deposits was controlled by the evolution of regional growth faults .

结合区域构造&沉积演化认为， 毒 重石矿床沉积-成矿作用受区域同生断裂演化控制。

Study on preparation of barium chloride from witherite and spent pickling solution

酸洗废液浸 取 毒 重石制氯化钡工艺研究