Measuring potential in a pressure oxidation autoclave II

测量压力氧化高压釜 II 中的电势

• 批准号: 484554-2015
• 负责人: Asselin, Edouard
• 金额: $ 3.21万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=584387
• 关键词: Measuring; potential; pressure; oxidation; autoclave

Pressure oxidation (POX) is used to treat the increasing number of gold ores that result in poor gold recovery when subjected to whole-ore direct cyanidation. Typically these "refractory" ores consist of sulphides, such as pyrite (FeS2) and arsenopyrite (FeAsS), which encapsulate the small gold particles and render them inaccessible to cyanide. The function of POX then is to break down the sulphide, thus liberating the gold for future cyanidation. POX is typically operated at high oxygen partial pressures (150 to 700 kPa) and high temperature (ca. 220°C) in a pressure vessel known as an autoclave. The conditions prevalent in the POX reactor are critical to the success of the downstream processing and ultimate gold recovery. In particular, it is very important that sulphide oxidation be controlled to ensure adequate break down of the sulphide minerals and high gold extraction during cyanidation. One variable that is often used for process control is the redox potential (ORP) of the oxidized slurry after discharge from the POX reactor. However, this method has the drawback of not reflecting the actual conditions in the reactor, as the measurement is also a reflection of the significant thermo-chemical changes associated with the cooling process. This project will continue the development of a novel and robust method and sensor to measure POX process ORP in-situ. In addition to the possibility of measuring ORP inside the reactor, a further advantage to the proposed method is that it may also allow for measurements of the extent of scaling (fouling) that occurs inside the reactor and of the total amount of soluble iron.

加压氧化（POX）用于处理越来越多的金矿石，这些金矿石在进行全矿直接氰化时导致金回收率很低。通常，这些“难处理”矿石由硫化物组成，如黄铁矿（FeS2）和毒砂（FeAsS），它们包裹着小的金颗粒，使它们无法被氰化物所接近。POX的功能是分解硫化物，从而释放出黄金用于未来的氰化。POX通常在高氧分压（150至700 kPa）和高温（约100 kPa）下操作。220°C）在称为高压釜的压力容器中进行。POX反应器中普遍存在的条件对于下游加工和最终金回收的成功至关重要。特别是，非常重要的是，控制硫化物氧化，以确保在氰化过程中充分分解硫化物矿物和高金提取率。通常用于工艺控制的一个变量是从POX反应器排出后氧化浆料的氧化还原电位（ORP）。然而，这种方法的缺点是不能反映反应器中的实际条件，因为测量也反映了与冷却过程相关的显著热化学变化。 该项目将继续开发一种新颖的和可靠的方法和传感器来测量POX过程的ORP。除了测量反应器内的ORP的可能性之外，所提出的方法的另一个优点是它还可以允许测量反应器内发生的结垢（结垢）的程度和可溶性铁的总量。