Conical Discharge Launder for Solvent Extraction Settler
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Solution Overview
Problem
Existing solvent extraction settler arrangements with constant cross-sectional discharge launders experience nonuniform flow rates, leading to standing zones, eddies, and crud accumulation, which increases material usage and maintenance needs, while also allowing mist emissions and contaminant ingress.
Innovation Solution
The settler arrangement features conical discharge launders with a cross-section that converges from the outlet end towards the closed end, ensuring a constant flow rate and reducing material usage, along with fibre-reinforced plastic or steel construction and level control valves to manage solution phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a constant cross-section discharge launder is used, then the structure is simple to manufacture, but the flow rate becomes nonuniform causing standing zones and eddies
Solution Approach 1:
The discharge launder cross-section is varied along its length, with the width being greatest at the outlet and progressively smaller towards the closed end. This local variation in geometry ensures that the flow rate remains substantially uniform throughout the launder, preventing standing zones and eddies while maintaining manufacturing feasibility.
2Productivity
If a constant cross-section discharge launder is designed for greatest flow volume, then the outlet discharge capacity is sufficient, but material usage increases excessively
Solution Approach 1:
The cross-sectional dimensions of the discharge launder are changed progressively along its length. The width parameter is greatest at the outlet where flow volume is maximum and decreases towards the closed end, allowing the structure to be sized appropriately for the actual flow conditions at each location rather than being uniformly oversized throughout.
3Device complexity
If standing zones and eddies occur in the discharge launder, then crud accumulation increases, but the constant cross-section design is simpler
Solution Approach 1:
The discharge launder cross-section is varied along its length, with the width being greatest at the outlet and progressively smaller towards the closed end. This local variation in geometry ensures that the flow rate remains substantially uniform throughout the launder, preventing standing zones and eddies where crud would accumulate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design maintains a consistent flow rate, minimizes crud accumulation, reduces material costs, and prevents mist emissions and contaminant entry, enhancing operational efficiency and reducing solution oxidation.
Implementation Method 1
the cross-section is optimal for the flow rate at each point along the length of the discharge launder. The flow rate remains constant
Implementation Method 2
a solvent extraction settler arrangement adapted for hydrometallurgical liquid-liquid extraction processes
Implementation Method 3
separate solution phases from a dispersion fed from the feed end while the dispersion flows to the discharge end
Implementation Method 4
an inclined bottom descending from the second end towards the first end
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A solvent extraction settler arrangement comprises a settler (1) having a feed end (2) and a discharge end (3), said settler being arranged to separate solution phases from a dispersion fed from the feed end while the dispersion flows to the discharge end. Elongated discharge launders (4, 5) are arranged at the discharge end (3) of the settler for each solution phase to be separated from the dispersion, each discharge launder (4, 5) including a first end (6), an outlet (7, 8) arranged at the first end, and a closed second end (9). At least one of the discharge launders (4, 5) has a form of a conical tube with a cross-section converging from the first end (6) towards the second end (9) and an inclined bottom (10, 11) descending from the second end (9) towards the first end (6).