PATENT CLAIM ANALYSIS

Application Number: 15991590
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 from low-purity crude lithium carbonate. The method includes: (a) producing crude lithium carbonate slurry by mixing crude lithium carbonate having a polycrystalline state and a size of 20 to 200 μm with water; (b) carbonating and dissolving the crude lithium carbonate slurry; (c) performing primary solid-liquid separation to obtain a filtrate; (d) adding soluble barium salts to the filtrate to deposit barium sulfate; (e) performing secondary solid-liquid separation for the filtrate containing the deposited barium sulfate to obtain a filtrate; (f) mixing lithium carbonate seed crystals with the filtrate obtained from the secondary solid-liquid separation and precipitating lithium carbonate dissolved in the filtrate on surfaces of the lithium carbonate seed crystals to produce high-purity lithium carbonate slurry containing high-purity lithium carbonate by controlling a particle size; and (g) carbonating the high-purity lithium carbonate slurry to produce high-purity lithium carbonate.

Claim (Index 3):
The method according to  claim 2 , wherein the first process includes steps of\n (h) removing an organic substance by passing a discarded lithium secondary battery waste liquid through activated carbon, (i) measuring a concentration of lithium ions contained in the discarded lithium secondary battery waste liquid obtained by removing the organic substance and adding soluble phosphate at an equivalent weight twice a concentration of the lithium contained in the lithium waste liquid to produce a lithium phosphate waste liquid, (j) performing reaction at a temperature of 70\u00b0 C. for 60 minutes by adding a pH conditioner containing NaOH or KOH to the lithium phosphate waste liquid to maintain a pH value at 13 or higher and then performing solid-liquid separation to produce low-purity lithium phosphate precipitated in a solid phase, (k) 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, (l) maturing the lithium phosphate by agitating the matured lithium phosphate liquid at room temperature for 30 minutes or longer, (m) adding a lithium hydroxide aqueous solution to the matured lithium phosphate liquid at a weight equivalent to a dosage of the acid to produce a lithium phosphate precipitation solution having a pH value of 13, and (n) agitating the lithium phosphate precipitation solution at a temperature of 70\u00b0 C. for 60 minutes or longer to obtain high-purity lithium phosphate, and the second process includes steps of (o) mixing the high-purity lithium phosphate with a sulfuric acid aqueous solution to produce a liquid mixture of lithium phosphate and sulfuric acid, (p) condensing the liquid mixture of lithium phosphate and sulfuric acid and performing solid-liquid separation to obtain high-purity lithium sulfate having a solid phase, (q) dissolving the high-purity lithium sulfate in water or a sodium hydroxide aqueous solution, depositing remaining phosphoric acid as lithium phosphate while maintaining a pH value of the lithium sulfate aqueous solution at 12 or higher, and performing solid-liquid separation to obtain a lithium sulfate aqueous solution, and (r) depositing lithium carbonate by adding carbonate, a carbonate aqueous solution, or a carbonic acid gas to the lithium sulfate aqueous solution and performing solid-liquid separation to obtain low-purity crude lithium carbonate having a solid-phase polycrystalline state and a particle size of 20 to 200 \u03bcm.

Metadata:
- Claim Count in Document: 23.0
- Percentile: 93.0
- Lexical Diversity: 2.47826
- Patent Class: 423.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15991388', '15240792', '14045297', '13029908', '13002591']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7707395997350692
- 35 USC 102 Novelty (BERT): 0.5821682540918302
- Combined Prediction Score: 0.7518824651707454
- Mean Citation Score: 313.928544
- Max Citation Score: 456.92264000000006
- Similarity Product: 441.2244977372265

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