Activated Bauxite Granules With Acid-Ammonia Granulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing agricultural applications using raw bauxite for phosphate loading in soils are inefficient and environmentally costly, while activated alumina is preferred despite higher energy input and waste, and conventional granulation processes result in variable granule quality and environmental impact.
Innovation Solution
Forming dispersible activated bauxite granules through a granulation process involving acids like boric acid, phosphoric acid, or nitric acid with ammonia, or agglomerating bauxite with supplemental nutrients and binders, resulting in coherent granules with enhanced phosphate absorption and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional calcination and chemical activation procedures are used to produce activated alumina, then surface area and porosity characteristics are improved, but energy consumption and environmental waste increase
Solution Approach 1:
The patent changes the activation parameters from high-temperature calcination (250-550°C) to low-temperature acid treatment followed by controlled drying. This parameter change achieves comparable surface area and porosity characteristics while significantly reducing energy consumption and eliminating the need for extensive chemical processing
Solution Approach 2:
The patent uses inexpensive acids (such as phosphoric acid, sulfuric acid, or nitric acid) for activation instead of expensive and energy-intensive calcination processes. The acid treatment is a simpler, more economical approach that achieves the desired activation without requiring high-energy equipment or producing hazardous waste
2Reliability
If activated alumina is used instead of activated bauxite, then phosphate absorption capacity is improved, but production cost and environmental impact increase
Solution Approach 1:
The patent converts the typically harmful acid treatment process into a beneficial activation method. By using acid treatment to activate bauxite, the patent achieves high phosphate absorption capacity while avoiding the environmental harms associated with traditional alumina production, including red mud waste and high energy consumption
Solution Approach 2:
The patent changes the material parameter from purified alumina to bauxite (a natural ore), and changes the activation parameter from high-temperature calcination to low-temperature acid treatment. This dual parameter change maintains phosphate absorption effectiveness while dramatically reducing environmental impact and production cost
3Ease of manufacture
If raw bauxite is used for phosphate loading, then production cost is reduced, but phosphate absorption efficiency and environmental performance worsen
Solution Approach 1:
The patent applies preliminary acid treatment to activate the bauxite before use, enhancing its phosphate absorption capacity. This preliminary activation step transforms raw, ineffective bauxite into a high-performance phosphate adsorbent, bridging the gap between low-cost raw material and high-performance application
4Ease of manufacture
If conventional granulation processes are used, then granule formation is achieved, but granule quality variability and environmental impact increase
Solution Approach 1:
The patent merges the activation process and granulation process into a single integrated operation. By adding acid and ammonia simultaneously during granulation, the patent achieves both granule formation and activation in one step, eliminating the variability associated with separate processing steps and reducing environmental impact
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 method produces granules with improved phosphate loading capacity, reduced variability, and lower energy consumption, offering a more efficient and environmentally friendly alternative to activated alumina.
Implementation Method 1
the activated bauxite particles have an enhanced ability to adsorb phosphates
Implementation Method 2
some level of activation of alumina trihydrate may occur via acid treatment, including partial acid dissolution and subsequent precipitation, which leads to a high porosity pseudoboehmite structure
Implementation Method 3
reacting the at least one acid with ammonia in a reactor vessel to form at least one ammonium salt
Implementation Method 4
drying the coherent dispersible granules
Data Source
AI summary
Dispersible activated bauxite granules are disclosed and methods for forming dispersible activated bauxite granules are disclosed in which bauxite is activated by a granulation process.