Granulated Lithium Adsorbent Sintering for Low-Manganese Elution
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Solution Overview
Problem
Existing methods for producing lithium adsorbents on a commercial scale struggle with insufficient suppression of manganese elution during the eluting step, making it difficult to maintain uniform acid concentration and leading to inefficiencies in the production process.
Innovation Solution
A producing method involving a kneading step, granulating step, and a sintering step at specific temperatures (520°C to 600°C for 4 to 6 hours) to convert divalent manganese in the lithium adsorbent precursor to tetravalent manganese, reducing its water solubility and thus suppressing elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If acid solution is used to elute lithium from the lithium adsorbent, then lithium can be extracted, but manganese elution occurs and cannot be sufficiently suppressed
Solution Approach 1:
The patent applies preliminary action by performing a sintering step before the elution step. The lithium adsorbent precursor is sintered at 520-600°C for 4-6 hours to convert divalent manganese to tetravalent manganese, which has lower water solubility. This preliminary thermal treatment prepares the material in advance to resist manganese elution during the subsequent acid treatment, thereby suppressing manganese elution while maintaining lithium extraction efficiency
Solution Approach 2:
The patent applies parameter changes by controlling the sintering temperature (520-600°C) and time (4-6 hours) to achieve the desired chemical transformation. This specific parameter range facilitates the conversion of divalent manganese to tetravalent manganese, which fundamentally changes the solubility parameter of manganese in the material, making it resistant to elution by acid solution while allowing lithium to be extracted
2Object-generated harmful factors
If acid concentration in the eluting solution is increased to suppress manganese elution, then manganese elution is reduced, but the cost and complexity of controlling acid concentration uniformly increases
Solution Approach 1:
The patent applies preliminary action by performing a sintering step before the elution step. The lithium adsorbent precursor is sintered at 520-600°C for 4-6 hours to convert divalent manganese to tetravalent manganese, which has lower water solubility. This preliminary thermal treatment prepares the material in advance to resist manganese elution during the subsequent acid treatment, thereby suppressing manganese elution while maintaining lithium extraction efficiency
Solution Approach 2:
The patent applies parameter changes by controlling the sintering temperature (520-600°C) and time (4-6 hours) to achieve the desired chemical transformation. This specific parameter range facilitates the conversion of divalent manganese to tetravalent manganese, which fundamentally changes the solubility parameter of manganese in the material, making it resistant to elution by acid solution while allowing lithium to be extracted
3Object-generated harmful factors
If the sintering temperature is increased to further suppress manganese elution, then manganese elution is reduced, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by controlling the sintering temperature (520-600°C) and time (4-6 hours) to achieve the desired chemical transformation. This specific parameter range facilitates the conversion of divalent manganese to tetravalent manganese, which fundamentally changes the solubility parameter of manganese in the material, making it resistant to elution by acid solution while allowing lithium to be extracted
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 effectively suppresses manganese elution, allowing the lithium adsorbent to be reused repeatedly and reducing the manganese concentration in the eluent, thereby optimizing the production process.
Implementation Method 1
a sintering step of sintering the 1 st granulated body
Implementation Method 2
the divalent manganese can be further allowed to become the tetravalent manganese
Data Source
Figure 1
Figure 2
AI summary
Provided is a producing method of granulated body for lithium adsorption that allows sufficiently suppressing a manganese elution in an eluting step when producing lithium on a commercial basis. A producing method of granulated body for lithium adsorption includes a kneading step of kneading a powder of a lithium adsorbent precursor and a binder to obtain a kneaded product, a granulating step of granulating the kneaded product to obtain a 1st granulated body, and a sintering step of sintering the 1st granulated body to obtain a 2nd granulated body. The configuration allows a manganese valence contained in the lithium adsorbent precursor to change from 2 to 4, and thus allowing the suppressed manganese elution in the eluting step. Further, in production on a commercial basis, the lithium adsorbent can be used repeatedly. In addition, a manganese concentration in an eluent obtained in the eluting step can be suppressed, thus allowing loads in steps after the eluting step to be reduced.