AU690101B2 - Evaporator for crystallised aluminate liquors - Google Patents

Evaporator for crystallised aluminate liquors Download PDF

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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
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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
Application number
AU63419/94A
Other versions
AU6341994A (en
Inventor
Vladilen Mitrofanovich Tyrtyshny
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aktsionernoye Obshchestvo Otkrytogo Tipa Vserossiysky Aluminievo-Magnievy Institut (ao Vami)
Original Assignee
AKTSIONERNOYE OBSHCHESTVO OTKR
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AKTSIONERNOYE OBSHCHESTVO OTKR filed Critical AKTSIONERNOYE OBSHCHESTVO OTKR
Priority to AU63419/94A priority Critical patent/AU690101B2/en
Publication of AU6341994A publication Critical patent/AU6341994A/en
Application granted granted Critical
Publication of AU690101B2 publication Critical patent/AU690101B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
AU63419/94A 1994-05-30 1994-05-30 Evaporator for crystallised aluminate liquors Expired - Fee Related AU690101B2 (en)

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)

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AU (1) AU690101B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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