HF-Free Flotation Reagent System for Feldspar Recovery
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Solution Overview
Problem
Conventional flotation processes for separating feldspar from quartz rely on hazardous hydrofluoric acid, which poses environmental and operational risks, and existing alternatives offer unsatisfactory recovery levels and selectivity.
Innovation Solution
A HF-free flotation process using a mixed cationic/non-ionic surfactant system comprising higher aliphatic amines and higher alcohols, with specific ratios and concentrations, to form an aqueous suspension at controlled pH, allowing for high feldspar recovery and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydrofluoric acid is used for conditioning feldspar, then selectivity and recovery are improved, but environmental safety and operational safety deteriorate due to toxicity and corrosiveness
Solution Approach 1:
The invention extracts and removes the hazardous hydrofluoric acid from the flotation process while maintaining the essential conditioning function through alternative reagents (sulfuric acid or hydrochloric acid combined with specific collectors), thereby eliminating environmental and operational safety risks without sacrificing separation performance
Solution Approach 2:
The invention introduces intermediary substances (promoters such as sulfonated oils, carboxylic acids, or their esters) that mediate between the acid conditioning agent and the feldspar surface, enabling effective flotation conditioning without direct contact with hazardous hydrofluoric acid, thus resolving the contradiction between effectiveness and safety
2Manufacturing precision
If hydrofluoric acid is used for conditioning feldspar, then selectivity is improved, but operational complexity and cost increase due to careful handling and disposal requirements
Solution Approach 1:
The invention removes the need for complex handling and disposal infrastructure associated with hydrofluoric acid by substituting it with safer alternative reagent systems, thereby simplifying the overall process design and operational procedures while maintaining selectivity
Solution Approach 2:
The invention employs readily available, inexpensive acid reagents (sulfuric acid, hydrochloric acid) and promoters that do not require special disposal facilities, replacing the need for expensive and complex HF handling systems, thus reducing process complexity and operational burden
3Object-affected harmful factors
If non-fluoride reagent systems are used to avoid HF, then environmental safety is improved, but feldspar recovery and selectivity deteriorate
Solution Approach 1:
The invention employs composite reagent systems combining multiple components (acids such as sulfuric or hydrochloric acid with specific promoters like sulfonated oils, carboxylic acids, or their esters) that work synergistically to achieve both high environmental safety and high feldspar recovery and selectivity, overcoming the limitations of single-component alternative reagents
Solution Approach 2:
The invention optimizes parameters such as pH control ranges (maintaining pH between 1.5-3.5), reagent concentrations, and conditioning times to maximize the effectiveness of non-fluoride reagent systems, thereby achieving recovery and selectivity levels comparable to or exceeding conventional HF processes while maintaining environmental safety
4Ease of operation
If pH is not carefully controlled in alternative reagent systems, then operational simplicity is improved, but feldspar quality and recovery deteriorate due to precipitate formation
Solution Approach 1:
The invention implements pH monitoring and control mechanisms (using pH meters, indicators, or automated control systems) that provide feedback to maintain pH within the optimal range of 1.5-3.5, preventing precipitate formation and ensuring high feldspar quality while keeping operational procedures straightforward through clear control targets
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 achieves high feldspar recovery and selectivity while avoiding the use of hazardous chemicals, providing a safer and more efficient separation method compared to conventional methods.
Implementation Method 1
Flotation processes are widely used in the art to concentrate and separate ore constituents present in naturally-occurring deposits, such as feldspar
Implementation Method 2
conditioning the ground material under high acidic conditions with a promoter, such as hydrofluoric acid or sodium fluoride... treating with a so-called 'collector', normally a cationic amine-type surfactant
Data Source
AI summary
A flotation process for recovering feldspar from a feldspar containing feed material is disclosed. The process includes forming an aqueous suspension of a feldspar containing feed material, in the absence of hydrofluoric acid, wherein the suspension includes from 0.004 to 0.3% wt. of a flotation reagent including: (a) one or more amines, containing at least one aliphatic hydrocarbon chain, linear or branched, saturated or unsaturated, including 8 to 50 carbon atoms, or a salt thereof; and (b) one or more primary, secondary or tertiary alcohols, containing at least one aliphatic hydrocarbon chain, linear or branched, saturated or unsaturated, including 8 to 50 carbon atoms; the ratio of (a) to (b) ranging from 500:1 to 1:40 by weight. The process further includes agitating the obtained suspension to produce a feldspar containing fraction, and separating the feldspar containing fraction.