PATENT CLAIM ANALYSIS

Application Number: 15991388
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2019-05
Patent Classification: ["423", "179500"]

Abstract:
Disclosed is a method of producing high-purity lithium carbonate and barium sulfate from discarded lithium secondary batteries, including: a first process for producing high-purity lithium phosphate from a discarded battery; and a second process for producing lithium sulfate from the lithium phosphate and producing lithium carbonate and barium sulfate from the lithium sulfate. The second process has steps of (a) producing a liquid mixture of lithium phosphate and sulfuric acid, (b) obtaining lithium sulfate by condensing the liquid mixture, (c) dissolving the lithium sulfate in water or a sodium hydroxide aqueous solution, depositing phosphoric acid as lithium phosphate, and performing solid-liquid separation (d) depositing lithium carbonate and performing solid-liquid separation to obtain lithium carbonate, (e) finely grinding the lithium carbonate and classifying the particles, (f) controlling a particle size and shape by dissloving edges of particles or minute particles, (g) performing solid-liquid separation, and (h) depositing barium sulfate.

Claim (Index 2):
The method according to  claim 1 , wherein step (I) comprises\n (i) passing discarded lithium secondary battery waste liquid through activated carbon to remove organic substances, (j) measuring a concentration of lithium ions contained in the discarded lithium secondary battery waste liquid from step (i) and adding soluble phosphate at an equivalent weight twice the lithium concentration of the lithium waste liquid to produce a lithium phosphate waste liquid, (k) adding a pH conditioner to the phosphate-lithium waste liquid to maintain a pH value at 13 or higher, generating reaction at a temperature of 70\u00b0 C. for 60 minutes, and performing solid-liquid separation to produce low-purity lithium phosphate precipitated as a solid phase, (l) adding water of 10 parts by weight to the low-purity lithium phosphate and adding acid to produce a matured lithium phosphate liquid having a pH value of 10, (m) agitating the matured lithium phosphate liquid at room temperature for 30 minutes or longer to mature the lithium phosphate, (n) adding a lithium hydroxide aqueous solution to the matured lithium phosphate liquid at an equivalent weight of the acid dosage to produce a lithium phosphate precipitation solution having a pH value of 13, and (o) agitating the lithium phosphate precipitation solution at a temperature of 70\u00b0 C. for 60 minutes or longer to obtain high-purity lithium phosphate.

Metadata:
- Claim Count in Document: 13.0
- Percentile: 93.0
- Lexical Diversity: 2.39189
- Patent Class: 423.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15991590', '15240792', '15240828', '14045297', '13029908']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7808286017135283
- 35 USC 102 Novelty (BERT): 0.5912156807405234
- Combined Prediction Score: 0.7618673096162278
- Mean Citation Score: 344.19859
- Max Citation Score: 479.6088
- Similarity Product: 457.2809350873947

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test