Cement Solidification Device for Waste Using Iron-Based Additive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cement solidification methods for waste containing heavy metals and deliquescent compounds fail to achieve the intended strength, leading to elution of harmful substances and moisture exudation, making landfill disposal challenging, especially with stringent environmental regulations.
Innovation Solution
A cement solidification device and method involving a slurrying vessel, cement kneading vessel, and iron-based additive to create a high-strength cement solidified product by dissolving waste in solvent water, adding a cement solidifying agent, and curing the mixture with an iron-based additive, which increases compressive strength and reduces elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cement solidification method is used for waste containing deliquescent compounds, then the process is simple, but the compressive strength is insufficient and harmful substances elute
Solution Approach 1:
The patent applies preliminary action by pre-mixing the deliquescent compound-containing waste with cement powder before adding water. This preliminary mixing ensures uniform distribution of waste particles throughout the cement matrix, preventing localized concentration that would cause moisture exudation and strength reduction. The waste is incorporated into the dry cement mix prior to hydration, which is the key difference from conventional methods where waste is typically mixed with wet cement slurry.
Solution Approach 2:
The patent creates a composite material system by combining cement, deliquescent compounds, and an iron-based additive (such as ferrous sulfate or ferric chloride). The iron-based additive reacts with the deliquescent compounds to form insoluble iron salts that precipitate within the cement matrix. This composite approach transforms the harmful deliquescent compounds into stable, non-eluting mineral phases, simultaneously improving compressive strength and preventing harmful substance leaching.
2Stability of the object's composition
If cement solidification is performed without iron-based additive, then the process is simpler, but moisture exudation occurs due to deliquescent behavior
Solution Approach 1:
The patent converts the harmful deliquescent behavior into a beneficial process by utilizing the deliquescent compounds to dissolve the iron-based additive, forming insoluble iron salts. The deliquescent compounds, which normally cause moisture exudation and strength reduction, are transformed into a mechanism for in-situ precipitation of stable iron salt minerals. This converts the harmful moisture-absorbing property into a useful precipitation reaction that locks harmful substances within the cement matrix.
Solution Approach 2:
The patent changes the chemical parameters of the system by introducing iron-based additives that alter the solubility equilibrium of deliquescent compounds. The iron-based additive changes the chemical environment from one where deliquescent compounds remain soluble and cause moisture exudation to one where they precipitate as insoluble iron salts. This parameter change (from soluble to insoluble state) fundamentally transforms the stability of the composition and prevents moisture-related problems.
3Ease of manufacture
If evaporated salts with deliquescent compounds are landfilled directly, then disposal is easier, but elution of harmful substances occurs under stringent regulations
Solution Approach 1:
The patent converts the harmful eluting properties of deliquescent compounds in evaporated salts into a beneficial precipitation process. By mixing the evaporated salts with cement powder and iron-based additives before final setting, the deliquescent compounds that would normally leach harmful substances are instead transformed into insoluble iron salt precipitates. This in-situ chemical transformation occurs during the cement setting process, converting a disposal hazard into a stable, regulation-compliant solidified product.
Solution Approach 2:
The patent creates a composite stabilized product by combining evaporated salts containing deliquescent compounds with cement and iron-based additives. This composite material system transforms the unstable, eluting evaporated salts into a stable, monolithic cement-solidified product. The iron-based additive forms insoluble salts that bind harmful substances within the cement matrix, creating a composite structure that meets stringent landfill elution regulations while maintaining disposal feasibility.
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 results in a cement solidified product with enhanced compressive strength, meeting environmental emission standards and ensuring stable landfill disposal, even under stringent regulations.
Implementation Method 1
adding a cement solidifying agent to slurried material in which an iron-based additive is mixed... reduces elution
Implementation Method 2
adding a cement solidifying agent to slurried material... to obtain a cement kneaded product
Implementation Method 3
curing the cement kneaded product to form a cement solidified product with enhanced compressive strength
Implementation Method 4
dissolving waste in solvent water, adding a cement solidifying agent
Data Source
AI summary
A cement solidification device for waste includes a slurrying vessel 14 that dissolves and slurries waste 11 containing harmful substances and deliquescent compounds in solvent water 12 to obtain slurried material 13; an iron-based additive supply unit 16 that adds an iron-based additive 15 to the slurrying vessel 14; a cement kneading vessel 20 that adds a cement solidifying agent 17 from a cement-solidifying agent supply unit 18 to the slurried material 13 in which the iron-based additive 15 is mixed to obtain a cement kneaded product 19; and a cement solidification unit 22 that cures the cement kneaded product 19 to form a cement solidified product 21.