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 1):
A method of producing high-purity lithium carbonate and barium sulfate from discarded lithium secondary batteries, the method comprising:\n (I) producing high-purity lithium phosphate from a discarded lithium secondary battery; and (II) producing high-purity lithium sulfate from the high-purity lithium phosphate and producing high-purity lithium carbonate and barium sulfate from the high-purity lithium sulfate, wherein step (III) comprises (a) mixing high-purity lithium phosphate from step (I) and a sulfuric acid aqueous solution to produce a liquid mixture, (b) condensing the liquid mixture of step (a) and performing solid-liquid separation on the liquid mixture to obtain high purity lithium sulfate solid, (c) dissolving the high-purity lithium sulfate solid in water or a sodium hydroxide aqueous solution having a pH value of 12 or higher, and performing solid-liquid separation to obtain a lithium sulfate aqueous solution and a solid-phase lithium phosphate, (d) adding carbonate, carbonate aqueous solution, or a carbonic acid gas to the lithium sulfate aqueous solution and performing solid-liquid separation to obtain solid-phase lithium carbonate, (e) finely grinding the solid-phase lithium carbonate and classifying lithium carbonate particles having a particle size of 1 to 5 \u03bcm to produce lithium carbonate slurry, (f) blowing a carbonic acid gas to the lithium carbonate slurry and dissolving edges of lithium carbonate particles or dissolving and removing minute particles of the lithium carbonate, (g) performing solid-liquid separation for the lithium carbonate slurry obtained by step (f), and (h) adding a soluble barium salt aqueous solution to a filtrate obtained from the solid-liquid separation of step (g) and performing solid-liquid separation to obtain high-purity barium sulfate having a solid phase, wherein the solid-phase lithium phosphate obtained through the solid-liquid separation of step (c) is used in production of the liquid mixture of lithium phosphate and sulfuric acid of step (a), wherein the lithium carbonate particles having a size larger than 5 \u03bcm in the classification of step (e) are additionally grinded until the particle size becomes 1 to 5 \u03bcm, and wherein the filtrate of step (h) is added to the fine grinding of step (e).

Metadata:
- Claim Count in Document: 13.0
- Percentile: 93.0
- Lexical Diversity: 2.39189
- Patent Class: 423.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15991590', '15240792', '15240828', '14045297', '13029908']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.762449899159482
- 35 USC 102 Novelty (BERT): 0.5810063428077611
- Combined Prediction Score: 0.74430554352431
- Mean Citation Score: 344.19859
- Max Citation Score: 479.6088
- Similarity Product: 410.1400306408882

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