Molten Alkali Hydroxide Dissolution for Silicate Ore Metal Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for extracting rare earth elements from alkali rock related deposits, such as eudialyte, face challenges including difficulty in dissolving the ores in acid, low concentration of rare earth elements in solutions, and silica gel formation that clogs filtration systems, leading to inefficient separation and increased waste.
Innovation Solution
A method involving a reaction step with molten alkali hydroxide and a subsequent precipitation step in water to efficiently separate metal components from silicate-containing treatment materials, using a controlled heating process to generate bubbles and react with the treatment material, followed by acid leaching and solvent extraction to enhance separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional acid dissolution methods are used to extract rare earth elements from silicate ores, then the extraction process can be simplified, but the ore cannot be dissolved effectively and silica gel forms that clogs filtration systems
Solution Approach 1:
The invention changes the chemical parameters of the dissolution medium from conventional acids to molten alkali hydroxide at elevated temperatures. This parameter change enables effective dissolution of silicate ores without forming silica gel, resolving the contradiction between process simplicity and dissolution effectiveness.
Solution Approach 2:
The invention utilizes the phase transition of alkali hydroxide from solid to molten state at elevated temperatures to achieve effective dissolution of silicate ores. The molten state provides the necessary chemical reactivity to break down silicate structures without forming problematic silica gel precipitates.
2Reliability
If large amounts of acid are used to dissolve silicate ores, then dissolution can be achieved, but the concentration of rare earth elements in the solution becomes very low
Solution Approach 1:
The invention changes the chemical environment from high-acid concentration to molten alkali hydroxide with controlled water content. This parameter change enables complete dissolution of rare earth elements while avoiding the dilution problem associated with large amounts of acid, achieving both reliable dissolution and high element concentration.
3Productivity
If acid leaching is performed after dissolution, then metal elements can be separated, but silica gel adheres to filtration surfaces and causes clogging
Solution Approach 1:
The invention converts the potentially harmful effect of silica formation into a beneficial separation mechanism. By controlling the dissolution conditions with molten alkali hydroxide, silica remains in solution while metal elements precipitate, enabling effective filtration without clogging. The process transforms what would be a harmful precipitate into a manageable component of the separation system.
4Ease of manufacture
If conventional extraction methods are used, then the process can be implemented, but waste liquid amount increases significantly
Solution Approach 1:
The invention changes the chemical parameters to use molten alkali hydroxide with controlled water content instead of large volumes of acid. This parameter change reduces the total liquid volume required for extraction while maintaining effective metal separation, thereby reducing waste liquid generation.
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 method effectively separates metal components, particularly rare earth elements, from silicate ores like eudialyte, reducing the formation of silica gel and improving the concentration and purity of the extracted metals, thus overcoming the inefficiencies of traditional extraction processes.
Implementation Method 1
a reaction step of reacting the treatment material and a molten alkali hydroxide in which bubbles due to water vapor derived from water are generated by heating a hydroxide of an alkali metal or an alkaline-earth metal and the water in a state where the hydroxide and the water coexist
Implementation Method 2
bubbles due to water vapor derived from water are generated by heating a hydroxide of an alkali metal or an alkaline-earth metal and the water
Implementation Method 3
a first precipitation step of dissolving the reaction product of the treatment material and the molten alkali hydroxide after the reaction step in water to generate a precipitate containing the metal elements in an obtained solution
Data Source
AI summary
A method for separating metal components from a treatment material containing a silicate and metal elements includes: a reaction step of reacting the treatment material and a molten alkali hydroxide in which bubbles due to water vapor derived from water are generated by heating a hydroxide of an alkali metal or an alkaline-earth metal and the water in a state where the hydroxide and the water coexist, to obtain a reaction product; and a first precipitation step of dissolving the reaction product of the treatment material and the molten alkali hydroxide after the reaction step in water, thereby generating a precipitate containing the metal elements.