Geothermal Filter Cake Washing for Low-Chloride Manganese-Zinc Recovery
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Solution Overview
Problem
The challenge in geothermal brine processing is the high concentration of chloride salts interfering with the recovery of manganese and zinc from geothermal filter cakes, leading to increased disposal costs and limited marketable value due to chloride's destructive nature in downstream processing.
Innovation Solution
A process involving repulping and washing geothermal filter cakes with a repulping and wash liquor to reduce chloride concentrations, followed by dewatering and drying to enhance manganese and zinc concentrations, using alkalis like sodium carbonate and potassium hydroxide, and employing countercurrent decantation for efficient chloride removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If geothermal filter cake is directly processed for manganese and zinc recovery, then the recovery process can proceed, but chloride salts interfere with downstream processing and increase disposal costs
Solution Approach 1:
The patent applies preliminary action by performing repulping and washing operations on the geothermal filter cake before downstream processing. The filter cake is repulped with water or dilute acid to dissolve chloride salts, then washed through filtration to remove the salty liquor. This preliminary removal of chloride interference enables reliable downstream manganese and zinc recovery processes.
2Ease of manufacture
If filter cake is disposed of traditionally, then disposal is simple, but operating expenses significantly increase
Solution Approach 1:
Instead of simply discarding the filter cake, the patent recovers valuable manganese and zinc metals from it through a multi-step process: repulping to dissolve chlorides, washing to remove salts, filtering to separate solids, and then processing the washed cake for metal extraction. This transforms a waste disposal problem into a resource recovery operation, eliminating disposal costs and generating metal products.
3Productivity
If chloride salts are not removed, then processing steps are reduced, but manganese and zinc recovery purity decreases
Solution Approach 1:
The patent extracts harmful chloride salts from the filter cake through repulping and washing operations. The filter cake is repulped with water or dilute acid, then washed through a filter system that separates the salty liquor from the solid cake. This extraction of chlorides before metal recovery ensures high purity manganese and zinc products while maintaining efficient processing through the subsequent extraction steps.
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
The process increases manganese and zinc concentrations by 30-40% and reduces chloride levels to less than 15 wt.%, enabling cost-effective and high-purity recovery of manganese and zinc products.
Implementation Method 1
repulping and washing geothermal filter cakes with a repulping and wash liquor to reduce chloride concentrations
Implementation Method 2
washing geothermal filter cakes with a repulping and wash liquor to reduce chloride concentrations
Implementation Method 3
dewatering and drying to enhance manganese and zinc concentrations
Implementation Method 4
dewatering and drying to enhance manganese and zinc concentrations
Implementation Method 5
dewatering and drying to enhance manganese and zinc concentrations
Implementation Method 6
using alkalis like sodium carbonate and potassium hydroxide
Implementation Method 7
employing countercurrent decantation for efficient chloride removal
Data Source
AI summary
This invention relates generally to a process for producing enhanced manganese-zinc geothermal filter cake compositions. After precipitation of zinc and manganese from a geothermal brine, the process repulps and washes a mixed polymetallic oxide/hydroxide/oxychloride geothermal filter cake with a repulp and/or a wash liquor to produce an enhanced, slurried manganese-zinc geothermal filter cake composition. The process can further include dewatering the slurried manganese-zinc geothermal filter cake composition to produce an enhanced, dewatered manganese-zinc geothermal filter cake composition, and the process can further include drying the dewatered manganese-zinc geothermal filter cake composition to produce an enhanced, dried manganese-zinc geothermal filter cake composition. The enhanced manganese-zinc geothermal filter cake compositions have enhanced concentrations of zinc and manganese and reduced concentrations of chloride and other salts. The enhanced manganese-zinc geothermal filter cake compositions can be processed to extract manganese and zinc therefrom.