Here’s a breakdown of the differences and the implications of using each form in mining operations:
Preparation and Handling
NaHS Liquid:
Direct Use: Since it’s already in liquid form, it can be pumped directly into the flotation cells or process solution without the need for prior dissolution.
Storage: Requires storage tanks that can handle the corrosiveness and ensure that the liquid doesn’t come in contact with air (to prevent the release of H₂S gas).
70% NaHS Flakes:
Dissolution Needed: Before use in the flotation process, the flakes need to be dissolved in water, which requires additional equipment and might slow down the process if not pre-dissolved.
Storage: Easier to store as they have a longer shelf life, are less corrosive compared to the liquid form, and don’t release H₂S gas until they come in contact with moisture.
Transportation and Costs
NaHS Liquid:
Can be more expensive to transport due to the added weight of the water content and the need for specialized tanker trucks.
Potential for spillage or leaks during transportation, which could be environmentally and financially costly.
70% NaHS Flakes:
Generally cheaper to transport given the higher concentration and less water weight.
Easier and safer to handle and transport in bags or containers compared to liquid NaHS.
Performance in Flotation
Both forms of NaHS, when correctly applied, should offer similar performance in terms of their role as a depressant or activator in flotation. The main difference lies in the ease of application and potential need for equipment to dissolve flakes.
Safety Concerns
NaHS Liquid: Can release H₂S gas if it comes in contact with air, which is toxic and poses health risks to workers.
70% NaHS Flakes: Also can release H₂S when exposed to moisture, but generally considered safer to handle and store than the liquid form due to their solid state.
Economic Considerations
NaHS Liquid: Although it might be more expensive to transport, the direct application can lead to operational efficiencies.
70% NaHS Flakes: Might incur additional costs in terms of dissolution equipment and the time taken for the dissolution process.
Decision Factors
When deciding between NaHS liquid and flakes for a mining operation, factors to consider include:
Operational logistics: Do you have the necessary equipment and facilities to dissolve and handle flakes? If not, liquid might be a more straightforward option.
Cost implications: Considering both transportation and processing costs.
Safety and environmental concerns
In essence, the choice between NaHS liquid and 70% flakes is multifaceted and often tailored to the specific needs and circumstances of the mining operation.
