Fluidized Solidified Soil from Gold Tailings
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Solution Overview
Problem
The utilization of gold tailings in filling materials is hindered by their poor fluidity and the need for precise particle size screening, which reduces their utilization rate and increases costs due to the presence of mainly clay particles with poor natural fluidity.
Innovation Solution
A fluidized solidified soil is prepared by mixing gold tailings with a dispersant solution and a solidifying material, comprising sodium hexametaphosphate, sodium tripolyphosphate, polyacrylamide, polycarboxylic acid, cement, blast furnace slag, fly ash, and gypsum, allowing for the formation of a fluidized solidified soil that can be used as a filling material without the need for extensive particle size screening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gold tailings are used as filling material, then resource utilization is improved, but poor fluidity makes processing difficult
Solution Approach 1:
A dispersant solution is introduced as an intermediary substance to improve the fluidity of gold tailings. The dispersant solution contains sodium hexametaphosphate, sodium tripolyphosphate, polyacrylamide, and polycarboxylic acid, which act as mediators to enhance the fluidity and processing characteristics of the gold tailings without changing their fundamental composition.
Solution Approach 2:
The physical and chemical parameters of the gold tailings are modified by adding dispersant solution and solidifying material. The dispersant solution changes the fluidity parameter, while the solidifying material (cement, blast furnace slag, fly ash, gypsum) changes the strength and setting characteristics, transforming the material from a poor fluid state to a workable filling material.
2Manufacturing precision
If particle size screening is performed on gold tailings, then filling material quality is improved, but processing complexity and cost increase
Solution Approach 1:
The problematic clay particles are extracted and removed from the gold tailings through gravity settling and filtration processes. By separating the fine clay particles from the coarser useful particles, the material undergoes natural concentration and purification without requiring complex mechanical screening equipment.
Solution Approach 2:
Hydraulic processes are used to separate particles by size and density. The dispersant solution and water flow create hydraulic conditions that allow finer particles to settle differently from coarser particles, enabling size separation through fluid dynamics rather than mechanical screens.
3Stability of the object's composition
If clay particles are present in gold tailings, then material composition is maintained, but fluidity and processing are hindered
Solution Approach 1:
The dispersant solution acts as a mediator that interacts with clay particles to reduce their harmful effect on fluidity. The dispersant molecules adsorb onto clay particle surfaces, reducing inter-particle attraction and improving overall fluidity while maintaining the natural composition of the gold tailings.
Solution Approach 2:
The viscosity and fluidity parameters of the gold tailings suspension are changed by adding dispersant solution. This modifies the rheological properties to make the material more workable during processing while preserving the original mineral composition and particle size distribution.
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 fluidized solidified soil improves the utilization rate of gold tailings, reduces landfill occupation, and provides economic and environmental benefits, with suitable fluidity for construction and unconfined compressive strength suitable for foundation reinforcement projects, simplifying the manufacturing process and reducing costs.
Implementation Method 1
a special dispersant solution... the dispersant is compounded by the following raw materials: sodium hexametaphosphate, sodium tripolyphosphate, polyacrylamide, and polycarboxylic acid
Implementation Method 2
the dispersant solution... improving the fluidity of the gold tailings
Implementation Method 3
a special solidifying material... the solidifying material is compounded by a mixture A of cement, blast furnace slag, fly ash, and a water reducer, and gypsum
Implementation Method 4
mixing the gold tailings with the dispersant solution and the solidifying material, and then stirring to form a fluidized solidified soil
Data Source
AI summary
A fluidized solidified soil based on gold tailings includes the following raw materials in parts by mass: 75 parts to 80 parts of gold tailings, 5.2 parts to 13 parts of a dispersant solution, and 9 parts to 16 parts of a solidifying material. A preparation method includes the following steps: mixing the gold tailings with the dispersant solution, and then stirring to obtain a suspension slurry of the gold tailings; and adding the solidifying material, and stirring to obtain the fluidized solidified soil. In the present disclosure, the gold tailings are used as a main material, combined with a special dispersant solution and a special solidifying material, and a fluidized solidified soil is prepared with fluidity suitable for pumping and a certain strength after hardening. The fluidized solidified soil prevents the pollution caused by gold tailings landfilling, and can be used as a filling material for various construction projects.