Patent US4386519A successfully refreshed from Google Patents.
US4386519A
Expired / Lapsed
US
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Specific surface fractionator
Assignee: Individual
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Filing: 1980-01-22
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Granted: 1983-06-07
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Expires: 2000-01-22
Abstract
Abstract The specific surface distribution of a pulp may be obtained by pumping a sample at a pressure to overcome the pressure drop of a plurality of hydrocyclones arranged in series with the apex of leading hydrocyclones connected to the inlet of the next hydrocyclone, etc. in the series. Back pressure is maintained on the base outlet of the leading hydrocyclone, the consistency of the feed to the first hydrocyclone is sufficiently low to ensure that the consistency of the fraction rejected from the apex outlet of the penultimate hydrocyclone in the series is adequate for efficient separation in the final hydrocyclone of the series i.e. to have a feed consistency not exceeding about 0.25% to the last hydrocyclone in the series. Samples are collected from outlets from the hydrocyclones and may be tested to determine specific surface thereby to obtain an indication of the specific surface distribution of the pulp.
Inventors
- 👤 John D. Sinkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:01
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0009; B; B04; B04C; B04C5/00; B04C5/08; B04C5/081; B04C5/24; B04C5/26; D21D; D21D1/00; D21D1/002; D21D5/00; D21D5/18; D21D5/24; G; G01; G01N; G01N15/00; G01N15/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A specific surface fractionator comprising; a plurality of hydrocyclones arranged in series, each of said cyclones having conical section with a base, a base outlet, an apex outlet and a tangential inlet adjacent said base; means connecting the inlet of each cyclone to the apex outlet of the preceding cyclone, valve means regulating the flow through the base outlets of at least some of said cyclones to maintain a back pressure on their respective base outlet to ensure that the pressure at the apex outlet of their respective hydrocyclone is sufficiently high to overcome the pressure drop in the succeeding cyclones in said series and to obtain the desired flows to the succeeding cyclones in said series, means for pumping a slurry to said inlet of the first cyclone in said series at a pressure sufficient high to overcome the pressure drop in each of the hydrocyclones in the series, and means for collecting samples ejected from at least some of said outlets of said cyclones.
Claim 2
Dependent Claim
166 words
A specific surface fractionator comprising; a plurality of hydrocyclones arranged in series, each of said cyclones having conical section with a base, a base outlet, an apex outlet and a tangential inlet adjacent said base; means connecting the inlet of each cyclone to the apex outlet of the preceding cyclone, valve means regulating the flow through the base outlets of at least some of said cyclones to maintain a back pressure on their respective base outlet to ensure that the pressure at the apex outlet of their respective hydrocyclone is sufficiently high to overcome the pressure drop in the succeeding cyclones in said series and to obtain the desired flows to the succeeding cyclones in said series, means for pumping a slurry to said inlet of the first cyclone in said series at a pressure sufficient high to overcome the pressure drop in each of the hydrocyclones in the series, and means for collecting samples ejected from at least some of said outlets of said cyclones.
Claim 3
Dependent Claim
21 words
A specific surface fractionator as defined in claim 1 wherein said series of cyclones comprises; three of said cyclones in series.
Claim 4
Dependent Claim
66 words
A specific surface fractionator as defined in claims 1 or 2 further comprising; a flow meter measuring flow to said first hydrocyclone and controlling a valve in a bypass line thereby to regulate the flow to said first hydrocyclone, and a flow meter regulating each of said valve means to regulate the pressure at the apex outlet of each said cyclone of said series of cyclones.
Claim 5
Independent Claim
198 words
A method of separating a pulp on the basis of specific surface into a plurality of samples comprising; providing an arrangement of hydrocyclones in series, each of said hydrocyclones having a conical section with a base, a base outlet, an apex outlet and a tangential inlet adjacent said base; the apex outlet of each hydrocyclone connected to the inlet of the succeeding hydrocyclone in the arrangement, feeding a slurry of said pulp to the inlet of a first hydrocyclone in said arrangement at a pressure sufficiently high to overcome the pressure drop through the arrangement and at a consistency to ensure that consistency of the feed to the last hydrocyclone in the arrangement is no greater than 0.25%, adjusting the flows through the base outlet of at least some of the cyclones in said arrangement to ensure that the pressure and flow at the apex outlet of each of said cyclones are sufficiently high to overcome the pressure drop in the succeeding cyclones in said series and provide pulp flow in the required amount and consistency for operation of the succeeding cyclones in said series, collecting fractions issuing from at least some of said outlets of said hydrocyclones.
Claim 6
Independent Claim
198 words
A method of separating a pulp on the basis of specific surface into a plurality of samples comprising; providing an arrangement of hydrocyclones in series, each of said hydrocyclones having a conical section with a base, a base outlet, an apex outlet and a tangential inlet adjacent said base; the apex outlet of each hydrocyclone connected to the inlet of the succeeding hydrocyclone in the arrangement, feeding a slurry of said pulp to the inlet of a first hydrocyclone in said arrangement at a pressure sufficiently high to overcome the pressure drop through the arrangement and at a consistency to ensure that consistency of the feed to the last hydrocyclone in the arrangement is no greater than 0.25%, adjusting the flows through the base outlet of at least some of the cyclones in said arrangement to ensure that the pressure and flow at the apex outlet of each of said cyclones are sufficiently high to overcome the pressure drop in the succeeding cyclones in said series and provide pulp flow in the required amount and consistency for operation of the succeeding cyclones in said series, collecting fractions issuing from at least some of said outlets of said hydrocyclones.
Claim 7
Dependent Claim
25 words
A method as defined in claim 4 wherein the consistency of the feed to the last hydrocyclone in the arrangement in no greater than 0.2%.
References Cited (Backward Citations)
US3873416A
Cited
US4135389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |