Biogenic Sodium Silicate Extraction for Low-Impurity Silica Feedstock

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Solution Overview

Problem

Conventional methods for producing sodium silicate from silica are expensive, time-consuming, and result in impure solutions with high turbidity and metallic impurities, particularly when using quartz sand or rice hull ash.

Innovation Solution

A method involving the production of sodium silicate from biogenic silica in an amorphous state using a process that includes rinsing ash from burned organic matter with clean water, heating it with sodium hydroxide under controlled pressure and temperature, and separating the solution to remove impurities, resulting in a high-purity sodium silicate solution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If quartz sand is melted with sodium carbonate in electrical furnaces at temperatures greater than or equal to 1300° C., then sodium silicate solids are produced, but the process is expensive and time-consuming

Engineering Contradiction:

Improvesodium silicate productionVSAvoidprocessing time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent changes the temperature parameter from conventional high-temperature melting (≥1300°C) to lower temperature processing (90-200°C) by using amorphous silica and controlled pressure conditions, thereby reducing processing time and energy consumption while maintaining sodium silicate production

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes phase transition of water from liquid to vapor under pressure to facilitate the dissolution of amorphous silica in sodium hydroxide solution, enabling the conversion to sodium silicate at lower temperatures without requiring conventional high-temperature melting processes

Inventive Principle:

Principle #36Phase transitions

2Quantity of substance

If crystalline silica sand is melted and dissolved to make sand-based liquid amorphous sodium silicate, then sodium silicate solution is produced, but the solution has high turbidity from suspended solids and high concentrations of heavy metals

Engineering Contradiction:

Improvesodium silicate solutionVSAvoidsolution purity

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent performs preliminary action by using amorphous silica instead of crystalline silica, which inherently contains fewer impurities. The amorphous structure allows for better dissolution and reduces the formation of suspended solids and metallic impurities from the outset

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts and removes impurities through a filtration system that separates suspended solids and metallic impurities from the sodium silicate solution, producing a clear, high-purity solution suitable for industrial applications

Inventive Principle:

Principle #2Taking out (Extraction)

3Manufacturing precision

If rice hulls are pretreated prior to combustion to reduce metallic impurities, then impurity levels decrease, but the process becomes expensive and time-consuming and requires large amounts of acid solutions

Engineering Contradiction:

Improveimpurity reductionVSAvoidprocessing complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent eliminates the need for expensive and complex acid-based pretreatment processes by directly using combustion rice hulls and employing a simpler, more economical filtration system that removes impurities without requiring large amounts of acid solutions

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent converts the potentially harmful effect of metallic impurities in rice hull ash into a beneficial outcome by using a filtration system that selectively removes these impurities while maintaining the high silica content, thereby producing high-purity sodium silicate without requiring complex pretreatment

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 yields a sodium silicate solution with reduced chloride and sulfate ion concentrations, lower organic content, and minimal impurities, achieving higher purity and potentially lower costs compared to conventional methods.

Implementation Method 1

heating it with sodium hydroxide under controlled pressure and temperature

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

heating it with sodium hydroxide under controlled pressure and temperature, and separating the solution to remove impurities

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 3

separating the solution to remove impurities, resulting in a high-purity sodium silicate solution

Methodology Applied

Scientific EffectSeparation: Centrifugal Separation

Implementation Method 4

separating the solution to remove impurities

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS12522508B2Sustainable silicates and methods for their extraction

Publication Date: 2026.01.13 PORNER ING M B H

AI summary

Liquid silicate products derived from processed organic plant matter (112), such as rice hulls, have improved purity and properties for use in the production of higher purity amorphous silica compositions (180). The liquid silicate can be optically clear, can have a controlled ratio of silica to metal earth oxide components, and can have lower concentrations of undesirable contaminants such as aluminum, chloride, iron, sulfate, and titanium.