Stepwise Silica Extraction from Silicate Substances
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Solution Overview
Problem
Current methods for extracting high-purity silicon oxide from inorganic solid wastes and natural sands are inefficient, leading to high consumption of alkaline and acidic substances, difficult water treatment, and significant generation of secondary waste, posing environmental and economic challenges.
Innovation Solution
A stepwise extraction method using a chlorine-containing inorganic acid leaching solution followed by electrochemical deposition to separate silica and hydroxides from silicate substances, reducing the amount of secondary waste and improving the purity of extracted compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional alkali or acid methods are used to extract silicon oxide from inorganic solid wastes, then extraction efficiency improves, but consumption of alkaline and acidic substances increases and significant secondary waste is generated
Solution Approach 1:
The invention changes the chemical parameters of the leaching solution by using a mixed acid system (hydrochloric acid, hydrofluoric acid, and sulfuric acid) with specific concentration ratios instead of traditional single alkali or acid methods. This parameter optimization enables efficient extraction of silicon oxide while reducing consumption of reagents and minimizing secondary waste generation
Solution Approach 2:
The invention employs a composite leaching solution composed of multiple acids (hydrochloric acid, hydrofluoric acid, and sulfuric acid) working synergistically. This composite chemical system achieves better extraction efficiency compared to single reagent methods while reducing overall reagent consumption and waste production
2Productivity
If traditional alkali or acid methods are used to extract silicon oxide from inorganic solid wastes, then extraction efficiency improves, but water treatment difficulty increases
Solution Approach 1:
By optimizing the acid concentration parameters and leaching conditions, the invention produces a leaching solution with more favorable composition for subsequent water treatment. The controlled dissolution process reduces the complexity of removing residual acids and metals from the solution, simplifying water treatment requirements
3Productivity
If traditional alkali or acid methods are used to extract silicon oxide from inorganic solid wastes, then extraction efficiency improves, but generation of secondary waste increases
Solution Approach 1:
The invention recovers and reuses the leaching solution after extraction, preventing it from becoming waste. The mixed acid solution is regenerated and circulated back into the leaching process, eliminating the need to discard large volumes of acidic waste solution and significantly reducing secondary waste 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 reduces residual slag, conserves resources, minimizes environmental pollution, and achieves high-purity silicon oxide and hydroxides, facilitating the efficient utilization of industrial and natural materials while avoiding the need for excessive alkaline substances.
Implementation Method 1
A stepwise extraction method using a chlorine-containing inorganic acid leaching solution followed by electrochemical deposition to separate silica and hydroxides from silicate substances
Implementation Method 2
The silicate substances are leached using a chlorine-containing inorganic acid
Data Source
AI summary
A method for stepwise extraction of silica and hydroxide from silicate substances. The silicate substances are leached by chlorine-containing inorganic acids, and the hydroxides are extracted step by step from the leaching liquor by electrochemical deposition method; The raw material of the powder is put in the reactor, inorganic acids, water-soluble alcohol and water are added as the leaching liquor, heated and reacted under the condition of 0.1 MPa or more, and the acidic multi-ion mixed solution and filter residue are obtained by filtration. The acidic multi-ion mixed solution is heated and boiled, and the silicon-containing volatile components are collected, decomposed and deposited in the collector; The deposited volatile components is dried to obtain high purity silica powder; The filter residue is washed and dried to obtain silica; The hydroxides are extracted from the acidic multi-ion mixed solution by electrochemical deposition method.