CN1017085B

CN1017085B - Electric-thermal smelting furnace

Info

Publication number: CN1017085B
Application number: CN 89108879
Authority: CN
Inventors: 约齐姆·斯坦代尔; 吉奥格·鲍曼; 卡尔·豪恩; 迪耶特尔·曼德尔考
Original assignee: Hoechst AG
Current assignee: Hoechst AG
Priority date: 1988-12-03
Filing date: 1989-11-30
Publication date: 1992-06-17
Also published as: EP0372236A2; CN1043557A; EP0372236A3; EP0372236B1; DE3840827A1

Abstract

An electrothermal reduction furnace for producing yellow phosphorus from a batch mixture composed of rock phosphate, gravel and coke consists of a furnace vessel (1) closed with a reinforced concrete cover (6). In this arrangement, several batch charging pipes (7) and several SODERBERG electrodes (8) penetrate through the concrete cover (6). The electrodes (8) are enclosed in the area of their penetration of the concrete cover (6) by low-set electrode holders exhibiting power supply plates (10). The electrodes (8) are hollow electrodes in which a central tube (12) is arranged in the centre in the sheet-metal jacket (11). Metal discs (13) are pulled onto the central tube at a distance from one another.

Description

Electric-thermal smelting furnace

The present invention relates to an electric reduction furnace, it is used for producing yellow phosphorus with a raw mix of being made up of primary phosphoric acid salt, gravel and coke, it comprises a heat size device that is closed by the Steel Concrete cap seal, this concrete has covered a plurality of material feeding tubes and a plurality of (SOderberg) self baking electrode passes, these electrodes penetrate in the zone of coagulation earth mulch at it, the low position electrode folder institute of being contained power panel around.

The phosphorus stove that is made of the heat size device with the bell sealing is known.In this occasion, this heat size device has at least one slag mouth and the outlet of at least one iron phosphorus thing in its lower region.The substrate of heat size device and low housing parts are served as a contrast with carbon brick, and the upper inside wall of heat size device has the refractory mortar masonry construction.Bell is penetrated by a plurality of feed-pipes and three (Soderberg) self baking electrodes, penetrate this each electrode by a low electrode clamp ring around (referring to " Ullmanns Encyklopadie der fechnischen Chemie " is the Ullmann industrial chemistry encyclopaedia, 18 volumes, the 4th edition, 1979,291 and 292 pages.

A shortcoming of this known phosphorus stove is that (Soderberg) self baking electrode of putting into electrode is stuck with paste, containing to volatilize reduces the composition of its viscosity, as triphen oil, this paste is when using coreless armature, show " shrinkage phenomenon ", it has surpassed because the normal volume that the process of baking causes shrinks, and promptly (Soderberg) self baking electrode is stuck with paste the transformation to final carbon dioxide process carbon electrode.The length that can in one day time, be equivalent to several days normal etch in the electrode paste position in the iron plate metal shell down.Obviously, also under the pressure that the electrode paste that is not enough solidified subsequent electrode is thereon stuck with paste, still can flow at the lower curtate of iron plate metal shell, and enter reduction furnace.Therefore, be the compensating electrode corrosion, the electrode paste additional by moving certain electrode shell length in the unit time is with additional by this, and uncontrollable electrode paste that pours in the reduction furnace superposes.The electrode paste that enters reduction furnace by this way is consumed with raw mix as carbonaceous material at first, and the stove process is not had conspicuous disadvantageous effect.Yet, owing to no longer continue, just have bleed in a large number reduction furnace the and a kind of danger that is referred to as the wet electrode fracture usually that can not suspect consequence arranged of electrode paste with a kind of controllable manner by baking the process that self baking electrode stick with paste to form carbon dioxide process carbon electrode.

Thereby, the purpose of this invention is to provide an electric reduction furnace that is used to produce yellow phosphorus, this reduction furnace has a heat size device that closes with the Steel Concrete cap seal, this coagulation earth mulch is penetrated by a plurality of self baking electrode, prevented that sticking with paste the pressure lower electrode paste that loads in subsequent electrode releases from the iron plate metal shell here.According to the present invention, this obtains by an electric reduction furnace.Wherein, electrode is a coreless armature, and central canal is placed in iron plate metal shell center in electrode; The tinsel disk is enclosed within on the central canal with spaced a certain distance; Central canal is fixed on the center of metal shell by being configured in gap rod around it.

According to the present invention, this electric reduction furnace can also have further expansion.

A. the gap rod is fixedly attached on iron plate metal shell and the central canal with special welding;

B. the interior diameter of iron plate metal shell is (10 to 15) with the ratio of central canal interior diameter: 1;

C. the outside diameter of tinsel disk is (1.5 to 2.5): I with the ratio of the interior diameter of center tube;

According to the present invention, in this electric reduction furnace, rosette is enclosed on the central canal, they have mutually between the gap, when sheet metal shell diameter is 135cm, be 50cm for example, disk plays barrier effect to the mobile electrode paste.

According to the present invention, in this electric reduction furnace, one electric current by being fixedly connected between iron plate metal shell and the central canal, enters reduction furnace from power panel through iron plate metal-coating and central canal under the help of gap rod.Even central canal is full of the 3 cold shape raw mixs that carefully draw that enter under the help of purified gas, the joule heating of electric current has guaranteed also that central canal has and has been higher than 800 ℃ temperature in it is lower than the zone of power panel.The high temperature of central canal has prevented that lubricated composition such as anthracene oil cooling from coagulating, and they volatilize the pitch in being contained in the self baking electrode paste on outer wall.

In the accompanying drawings, a most preferred embodiment of the present invention illustrates with the form of signal and sectional view.

An electric reduction furnace is made of an iron furnace container 1, the substrate bag of heat size device and it than the outer hub plate of lower curtate with carbon brick 2, and the inwall in its all the other shell zones is made with refractory mortar masonry construction 3.This container has a slag mouth 4 and an iron phosphorus thing outlet 5 in its underpart.Heat size device 1 is above that with a reinforced concrete earth mulch 6 sealings, lid 6 is penetrated by feed-

pipe

7 and 3 self baking electrodes 8 that the raw mix hopper that does not illustrate among a plurality of and the figure links to each other, electrode 8 in it penetrates the zone of coagulation earth mulch 6 by a low position electrode press from both sides 9 around, accompany the power panel 10 that links to each other with unillustrated current transformer among the figure with electrically conducting manner that is placed at electrode.Electrode 8 is coreless armatures, and central canal 12 is placed on the central authorities of iron plate metal shell 11 therein.Iron plate metal shell 11 links to each other with the power supply utmost point 10 by frictional resistance.Tinsel disk 13 is enclosed on the central canal 12 between mutually at a certain distance, and they be placed in hold-down bars 14 in the heart.The gap rod be configured on the circumference and be soldered to iron plate metal shell 11 and central canal 12 on.

After this electric reduction furnace was switched on, one electric current flowed to central canal 12 from power panel through iron plate metal shell 11 and hold-down bars 14, thereby flows to electric reduction furnace.This electric current prevents that central canal 12 is cooled to below 800 ℃, and by this pipe 12, the cold fine-grannular raw material that is suspended in the cold cleaning gas is blown.

Claims

1, one is used for from by primary phosphoric acid salt, the raw mix that gravel and coke are formed is produced the electric reduction furnace of yellow phosphorus, it is made of a heat size device that closes with the Steel Concrete cap seal, this coagulation earth mulch is penetrated by a plurality of raw mix feed-pipes and a plurality of self baking electrode, this electrode is in it penetrates the zone of coagulation earth mulch, the low position electrode folder institute of being contained power panel around, it is characterized in that: electrode (8) is a coreless armature, and a central canal (12) is placed on the central authorities of iron plate metal shell (11) in electrode; Tinsel disk (13) is enclosed on the central canal (12) with certain distance between mutual; And this central canal (12) is fixed on the center of metal shell by being configured in hold-down bars (14) around it.

2, electric reduction furnace according to claim 1 is characterized in that, hold-down bars (14) is rigidly fixed to be connected on iron plate metal shell (11) and the central canal (12).

3, electric reduction furnace according to claim 1 and 2 is characterized in that, the ratio of the interior diameter of the interior diameter of iron plate metal shell (11) and central canal (12) is 10 to 15: 1.

4, according at least one described electric reduction furnace in claim 1 or 3, its spy is that the ratio of the interior diameter of the outside diameter of tinsel disk (13) and central canal (12) is 1.5 to 2.5: 1.