AU690101B2 - Evaporator for crystallised aluminate liquors - Google Patents
Evaporator for crystallised aluminate liquors Download PDFInfo
- Publication number
- AU690101B2 AU690101B2 AU63419/94A AU6341994A AU690101B2 AU 690101 B2 AU690101 B2 AU 690101B2 AU 63419/94 A AU63419/94 A AU 63419/94A AU 6341994 A AU6341994 A AU 6341994A AU 690101 B2 AU690101 B2 AU 690101B2
- Authority
- AU
- Australia
- Prior art keywords
- chamber
- crystallised
- liquor
- evaporator
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
P/00/011 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT ooo e Invention Title: EVAPORATOR FOR CRYSTALLISED ALUMINATE LIQUORS The following statement is a full description of this invention, including the best method of performing it known to us: w *r 2 THIS INVENTION provides for operation of the unit under conditions of rapid sedimentation of salt crystals. Crystals and scale particles are removed from lower part of the solution chamber through a pipe. Continuous upward slurry flow inside pipe is created due to different densities of the liquor columns outside boiling chamber and the boiling liquor inside it.
''The invention is related to alumina production, in particular to evaporators used in chemical, metallurgical and other industries.
The aim of the invention is to provide for workability of the apparatus under conditions of increased sedimentation of salt crystals during '.i evaporation of aluminate liquors.
S.Lay-out of the evaporation unit is shown on Figure.
The evaporator consists of a vertical cylindrical housing i, coaxial heating chamber with a plurality of heating tubes 2 arranged therein, boiling chanmber 3, separator 4, the lower part of a solution chamber 5, a connection pipe 6, inputs 7 and 8 for liquor and heating steam, and outputs 9, 10 and 11 for I- -y CC) evaporated liquor, secondary steam and heating steam condensate.
The evaporator operates as follows: Initial liquor is fed through input 7 into upper solution chamber, goes down the heating pipes to lower chamber 5. Then due to upward flow it goes through central heating pipes to boiling chamber 3, where it starts boiling because of low pressure in *o boiling chamber, thus steam is formed outside heating 1: 0 surface. The density difference between boiling and *oSt non-boiling liquors creates circulation forces. Due 0 to this the liquor circulates and salt crystals are sucked through connection pipe 6 from lower part of the chamber 5 to chamber 3. Evaporated liquor is
S
discharged through output 9, secondary steam through
S
S• output 10. Heating steam is supplied to heating chamber 2 through input 8, heating steam condensate is removed through output 11.
Connection pipe 6 between boiling chamber 3 and lower chamber 5 eliminates accumulation (f salt crystals in the solution chamber and provides for stable circulation of the liquor.
Claims (3)
1. An evaporator for crystallised aluminate liquors having a cylindrical housing with inputs for liquor and heating steam and outputs of evaporated liquor, secondary steam and condensate, and a coaxial heating chamber, with a boiling chamber located above a central beam of a plurality of heating pipes, a solution chamber and separator, characterised by a connection pipe connecting a lower part of the 0 solution chamber and the boiling chamber, and wherein the ratio of the diameter of the connection pipe and the diameter of the heating pipe is in a range from 'between
2.0 to S S 2. An evaporator for crystallised aluminate liquors substantially as hereinbefore described with reference to the accompanying drawings.
3. A method for evaporation of crystallised aluminate liquors whenever carried out in an evaporator according to either one of claims 1 or 2. A method for evaporation of crystallised aluminate liquors substantially as hereinbefore, described with reference to the accompanying drawings. DATED this Third day of February 1998. AKTSIONERNOYE OBSHCHESTVO OTKRYTOGO TIPA VSEROSSTYSKY ALTMINIEVO-MAGNIEVY INSTITUT (AC vami) By their Patent Attorneys FISHER ADAMS KELLY 4'7-EN ABSTRACT An evaporator for crystallised aluminate liquors comprises a chamber having inlet ports for the aluminate liquor and heating steam as well as outlet ports for evaporated liquor secondary steam and condensate. A conduit communicates between the lower part of the evaporation chamber and the boiling chamber to remove crystalline precipitates from the lower part of the evaporation chamber to prevent an accumulation of crystalline material in the lower part of the evaporation chamber which might otherwise interfere with circulation of liquor within the chamber. .o S oo o *e e
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU63419/94A AU690101B2 (en) | 1994-05-30 | 1994-05-30 | Evaporator for crystallised aluminate liquors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU63419/94A AU690101B2 (en) | 1994-05-30 | 1994-05-30 | Evaporator for crystallised aluminate liquors |
Publications (2)
Publication Number | Publication Date |
---|---|
AU6341994A AU6341994A (en) | 1996-01-04 |
AU690101B2 true AU690101B2 (en) | 1998-04-23 |
Family
ID=3748226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU63419/94A Expired - Fee Related AU690101B2 (en) | 1994-05-30 | 1994-05-30 | Evaporator for crystallised aluminate liquors |
Country Status (1)
Country | Link |
---|---|
AU (1) | AU690101B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0065332A1 (en) * | 1981-05-12 | 1982-11-24 | Esmil B.V. | Apparatus and method for the concentration of a liquid by evaporation |
SU1725939A1 (en) * | 1989-09-11 | 1992-04-15 | Среднеазиатский Филиал Всесоюзного Научно-Исследовательского Конструкторского И Технологического Института Гидромашиностроения | Evaporator |
-
1994
- 1994-05-30 AU AU63419/94A patent/AU690101B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0065332A1 (en) * | 1981-05-12 | 1982-11-24 | Esmil B.V. | Apparatus and method for the concentration of a liquid by evaporation |
SU1725939A1 (en) * | 1989-09-11 | 1992-04-15 | Среднеазиатский Филиал Всесоюзного Научно-Исследовательского Конструкторского И Технологического Института Гидромашиностроения | Evaporator |
Also Published As
Publication number | Publication date |
---|---|
AU6341994A (en) | 1996-01-04 |
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