US3877311A
Expired / Lapsed
US
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Method for sieving a sample of particulate materials from a sintering charge
Assignee: Nippon Steel Corp
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Filing: 1973-10-19
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Granted: 1975-04-15
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Expires: 1993-10-19
Abstract
Abstract A sample recovered from the particulate materials of a sintering charge is dried to the extent that the water content thereof is about 0.2% to 1.2% and then sieved. Thus, the pseudo particles in said sample are not destroyed so that the accurate distribution of the particle size of charge materials at the time of sintering can be determined.
Inventors
- 👤 Kinichi Sugawara
- 👤 Ryo Shimizu
- 👤 Masahiko Kawato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:57
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0272
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
209 words
A method for analyzing a sample of particulate material suitable for sintering to accurately determine the particle size distribution thereof, individual particles of said material characterized by possessing a relatively large nucleus to which is bonded by water as the bonding medium, pulverulent material or powder of relatively small size, which comprises: a. drying the particulate material to adjust the water content thereof, the upper level of water content being the maximum amount of water tolerated for substantially complete sieving of the material and the lower level of water content being the maximum amount of water required to maintain substantially complete bonding of pulverulent material or powder to each individual particle nucleus; b. sieving the particulate material through a plurality of sieving means of different orifice size to provide a plurality of portions of the particulate material individual paticles of which possess substantially all of the pulverulent material or powder originally adhering thereto, each portion constituting a different particle size range; and c. weighing each portion of particulate material constituting a different particle size range based on the total weight of the sample of particulate material to determine the percentage by weight thereof thus providing an accurate determination of the particle size distribution of the sample of particulate material.
Claim 2
Independent Claim
209 words
A method for analyzing a sample of particulate material suitable for sintering to accurately determine the particle size distribution thereof, individual particles of said material characterized by possessing a relatively large nucleus to which is bonded by water as the bonding medium, pulverulent material or powder of relatively small size, which comprises: a. drying the particulate material to adjust the water content thereof, the upper level of water content being the maximum amount of water tolerated for substantially complete sieving of the material and the lower level of water content being the maximum amount of water required to maintain substantially complete bonding of pulverulent material or powder to each individual particle nucleus; b. sieving the particulate material through a plurality of sieving means of different orifice size to provide a plurality of portions of the particulate material individual paticles of which possess substantially all of the pulverulent material or powder originally adhering thereto, each portion constituting a different particle size range; and c. weighing each portion of particulate material constituting a different particle size range based on the total weight of the sample of particulate material to determine the percentage by weight thereof thus providing an accurate determination of the particle size distribution of the sample of particulate material.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein step a. further comprises adjusting the water content of the particulate material to within the range of from about 0.2% to 1.2% by weight thereof.
Claim 4
Dependent Claim
51 words
The method of claim 1 wherein sieving is carried out upon sieving means of progressively decreasing orifice size, said orifice sizes being (i) greater than 5 mm, (ii) from 5 to 2 mm, (iii) from 1 to 0.5 mm, (iv) from 0.5 to 2.25 mm and (v) less than 0.25 mm.
Claim 5
Dependent Claim
165 words
THE METHOD OF CLAIM 1 WHICH FURTHER COMPRISES THE STEPS OF D. REMOVING SUBSTANTIALLY ALL OF THE WATER FROM EACH PORTION OF PARTICULATE MATERIAL RESULTING FROM STEP (B); E. WEIGHING EACH PORTION OF PARTICULATE MATERIAL; F. PLACING EACH PORTION OF PARTICULATE MATERIAL IN A SIEVING MEANS HAVING AN ORIFICE SIZE LESS THAN THE PARTICLE RANGE SIZE OF THE PORTION OF PARTICULATE MATERIAL BUT GREATER THAN THE SIZE OF THE PULVERULENT MATERIAL OR POWDER ADHERING TO THE INDIVIDUAL PARTICLES THEREOF; G. WASHING EACH PORTION OF PARTICULATE MATERIAL THUS CAUSING THE PULVERULENT MATERIAL OR POWDER ADHERING TO INDIVIDUAL PARTICLES TO BE IDSLODGED THEREFROM AND CARRIED THROUGH THE ORIFICES OF THE SIEVING MEANS; H. REMOVING SUBSTANTIALLY ALL OF THE WATER FROM EACH PORTION OF PARTICULATE MATERIAL RESULTING FROM STEP (G); AND I. WEIGHING EACH PORTION OF PARTICULATE MATERIAL RESULTING FROM STEP (H) THUS PROVIDING AN ACCURATE DETERMINATION OF 20 THE WEIGHT QUANTITY OF PULVERULENT MATERIAL OR POWDER ADHERING TO THE INDIVIDUAL PARTICLES CONSTITUTING EACH PORTION OF PARTICULATE MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |