Unblocking Deep Wells With Carboxylic Acid Dissolution
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Solution Overview
Problem
Deep wells used for lithium brine extraction can become clogged due to manganese oxide adsorbents entering the subsurface, leading to reduced performance or complete loss of operation, as these adsorbents block cracks and fissures, preventing water absorption and requiring plant shutdown.
Innovation Solution
The use of carboxylic acids, such as citric acid or ascorbic acid, to dissolve and remove the adsorbent blockages in deep wells, allowing for their safe disposal back to the surface, thereby restoring the well's functionality without causing chemical reactions in the subsurface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If manganese oxide adsorbent is used to concentrate lithium ions from brine, then lithium ion concentration is improved, but well clogging occurs due to adsorbent particles entering the subsurface
Solution Approach 1:
The adsorbent is divided into size fractions using classification equipment, allowing only particles within a specific size range (0.1-5 mm) to be used. This segmentation prevents fine particles from entering and clogging the subsurface while retaining enough surface area for effective lithium adsorption.
Solution Approach 2:
A filtration system acts as an intermediary between the adsorbent and the subsurface environment. The filter prevents adsorbent particles from entering the subsurface while allowing the depleted brine to pass through, thus protecting the well from clogging.
2Productivity
If adsorbent grains are used in the deep water circulation system, then lithium adsorption is improved, but clogging of cracks and fissures in subsurface occurs
Solution Approach 1:
Different size requirements are applied to different locations: larger particles (0.1-5 mm) are allowed in the adsorption system where they are needed for lithium extraction, while a filtration barrier is placed at the subsurface interface to prevent any particles from entering the cracks and fissures. This local quality control ensures productivity while preventing harm.
3Reliability
If adsorbent particles enter the subsurface, then water absorption capacity is reduced, but complete plant shutdown is required
Solution Approach 1:
The adsorbent is pre-classified and filtered before being introduced into the deep water circulation system. This preliminary action prevents particles from entering the subsurface in the first place, avoiding clogging and the need for plant shutdown. The filtration is performed upstream, before the harmful effect can occur.
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
Effectively unblocks deep wells by dissolving manganese oxide adsorbents, preventing clogging and maintaining water absorption capacity, allowing for continuous operation and safe disposal of the adsorbent, thus ensuring the plant's operational integrity.
Implementation Method 1
an aqueous solution containing lithium is brought into contact with a manganese oxide adsorbent in one or more adsorber columns, so that at least parts of the lithium ions contained in the aqueous solution are adsorbed on the adsorbent
Implementation Method 2
a carboxylic acid, a di- or tricarboxylic acid, a vinylogous carboxylic acid or an acid from the group of the aforementioned acids or a mixture of these acids is used for dissolving a lithium adsorbent and/or a manganese oxide type adsorbent
Data Source
AI summary
A method is proposed for making geological deep wells that are clogged unblocked and capable of absorbing fluid again by adding an acid from the group of carboxylic acids and vinylogous carboxylic acids.