CN117051240A

CN117051240A - Silicon heating method magnesium smelting facility

Info

Publication number: CN117051240A
Application number: CN202311048419.XA
Authority: CN
Inventors: 李运雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-07-17
Filing date: 2023-08-18
Publication date: 2023-11-14

Abstract

The application discloses a magnesium smelting facility by a silicothermic process. The facility includes a reduction chamber, a condensing tower, and a magnesium pool. Reduction chamber (100): the top is provided with a ferrosilicon feed inlet (102) and at least one magnesia feed inlet (103) at intervals, the bottom is provided with at least one slag discharge port for guiding out reaction residues, and the inner surface is provided with a reduction chamber lining made of refractory materials. The bottom surface of the lining of the reduction chamber comprises at least two areas, wherein one higher area is used for bearing the ferrosilicon added from the ferrosilicon charging port, and the other lower areas are used for bearing the ferrosilicon flowing down from the higher area and also used for bearing the magnesite added from the magnesite charging port. The equipment is suitable for directly smelting magnesium at high temperature from magnesia and ferrosilicon, and can improve the efficiency and benefit of smelting magnesium by a silicothermic process.

Description

Silicon heating method magnesium smelting facility

Technical Field

The application belongs to the technical field of magnesium metal smelting, and particularly relates to a magnesium smelting facility by a silicon thermal method.

Background

In the existing silicon-heating magnesium smelting process, a high-temperature calcined product (magnesia material) of a magnesium oxide mixed slag former calcium oxide and high-temperature ferrosilicon slag (ferrosilicon material) smelted by an ore smelting furnace are cooled, crushed and mixed uniformly, and then subjected to vacuum reduction at 1200 ℃. The process has great heat dissipation, uses ferrosilicon about 1.2 times of theoretical value, and has great labor intensity. It is desirable to directly melt react ferrosilicon and magnesium oxide at high temperature to save energy, reduce consumption and simplify the operation flow.

In the magnesium smelting method disclosed in patent CN115161478A/2022, silicon-containing magnesium minerals are leached by an acid cross-flow method, and molten ferrosilicon prepared from an acid leaching solution is subjected to in-situ vacuum reaction with MgO. The in-situ vacuum reaction process mainly comprises the following steps: spraying 10-200 mesh MgO powder containing additive/cosolvent into molten ferrosilicon, reacting at 700-1800 deg.C and negative pressure of 1-20Pa. The patent does not disclose about industrial facilities.

An industrial facility for smelting magnesium aims to solve the heating problem and the cooling problem.

(1) The melting point of 75 # ferrosilicon is about 1230 ℃, the melting point of slag is about 1350 ℃, and the process temperature above 1300 ℃ is difficult to realize by the existing industrial equipment. Electromagnetic induction heating, wherein the external electromagnetic coil can heat and soften the steel furnace shell, so that the strength of equipment is affected; the coil is placed in the furnace shell and water cooled to prevent short circuits, once the water leaks, it can react with magnesium violently to explode. The electrode is heated by discharge, and the electrode is severely vibrated and possibly broken. Resistance heating, the alloy material may be dissolved and damaged by contact with molten ferrosilicon.

(2) At low production rates, outside air may be used to cool the magnesium vapor in the canister. Water cooling is adopted in large-scale production, and water leakage can react with magnesium severely to explode.

Disclosure of Invention

The application aims to solve the technical problem of how to improve the industrial facilities for smelting magnesium by a silicothermic process so as to realize the direct melting reaction of ferrosilicon and magnesium oxide.

The application discloses a magnesium smelting facility by a silicothermic process.

The silicothermic magnesium smelting facility comprises a reduction chamber, a condensing tower and a magnesium pool, wherein the reduction chamber is used for reduction reaction of magnesia material and ferrosilicon material, the condensing tower is used for cooling magnesium vapor, and the magnesium pool is used for collecting liquid magnesium;

reduction chamber: the top is provided with an ferrosilicon feed inlet and at least one magnesia feed inlet at intervals, the bottom is provided with at least one slag discharge port for guiding out reaction residues, and the inner surface of the slag discharge port is provided with a reduction chamber furnace lining made of refractory materials;

the bottom surface of the lining of the reduction chamber comprises at least two areas, wherein one higher area is used for bearing the ferrosilicon added from a ferrosilicon charging hole, and the other lower areas are used for bearing the ferrosilicon flowing down from the higher areas and also used for bearing the magnesia added from a magnesia charging hole.

In some embodiments of the application, the condensing tower may be selected from: the top is provided with a coolant feed for carrying contact cooled hydrochloride coolant.

In some embodiments of the application, optionally, the top of the magnesium pool: one side is communicated with the top of the reduction chamber through a first communicating pipe, and the other side is communicated with the bottom of the condensation tower through a second communicating pipe.

In some embodiments of the application, the reduction chamber comprises a straight strip-shaped body, in the floor of the reduction chamber lining: the upper areas are opposite to the ferrosilicon charging holes, and each lower area is opposite to one magnesia charging hole.

In some embodiments of the present application, an argon interface, an anode bus and a cathode bus are arranged at the top of the reduction chamber, and the anode bus and the cathode bus are connected with a heating power supply line and are respectively positioned at two ends of the reduction chamber in the long axis direction of the overhead projection.

In some embodiments of the present application, the reducing chamber is arranged on a reinforced concrete base, the outer surfaces of the side wall and the top of the reducing chamber are provided with steel reducing chamber furnace shells, a reducing chamber heat insulation layer of refractory materials is arranged between the reinforced concrete base and the reducing chamber furnace lining and between the reducing chamber furnace shells and the reducing chamber furnace lining, and the slag discharging port is formed by: is a carbon material preform, is plugged with stemming during the reduction reaction and covers the external opening with refractory mortar.

In some embodiments of the application, the condensing tower may be selected from: the steel condensing tower furnace shell is arranged on the reinforced concrete base, the outer surfaces of the side wall and the top are provided with steel condensing tower furnace shells, and the inner surface is provided with a condensing tower furnace lining made of refractory materials.

In some embodiments of the application, the magnesium pool may be selected from: the side wall and the outer surface of the top are provided with a steel magnesium pool furnace shell, and the inner surface is provided with a magnesium pool furnace lining made of refractory materials.

The technical scheme of the application can obtain the following beneficial effects.

The application discloses a magnesium smelting facility by a silicothermic process. The facility includes a reduction chamber, a condensing tower, and a magnesium pool. Reduction chamber: the top is provided with an ferrosilicon feed inlet and at least one magnesia feed inlet at intervals, the bottom is provided with at least one slag discharge opening for guiding out reaction residues, and the inner surface is provided with a reduction chamber furnace lining made of refractory materials. The bottom surface of the lining of the reduction chamber comprises at least two areas, wherein one higher area is used for bearing the ferrosilicon added from the ferrosilicon charging port, and the other lower areas are used for bearing the ferrosilicon flowing down from the higher area and also used for bearing the magnesite added from the magnesite charging port. The facility is suitable for direct high-temperature melting reaction of magnesia and ferrosilicon, and can improve the efficiency and benefit of magnesium smelting by a silicothermic process.

The specific technical effects are as follows.

1) The high-temperature magnesia material and the ferrosilicon material can be fed in a partitioned mode, and the ferrosilicon material is contacted with the magnesia material for solid-liquid phase reduction reaction after being remelted, and compared with the solid-solid phase reaction of magnesium smelting by the existing silicothermic method: the method does not need the treatment processes of cooling, crushing, mixing, pelletizing, reheating and the like, can shorten the flow, save energy and reduce emission, has more complete reaction and low ferrosilicon consumption.

2) The lining of the reduction chamber can be made of carbon refractory bricks (namely carbon bricks), has reducibility and can not separate out impurities, so that the furnace is safe and stable at high working temperature.

3) The bottom surface of the furnace lining of the reduction chamber is higher than the area below the ferrosilicon charging hole, so that solidified ferrosilicon at about 1200 ℃ can be adopted, and the ferrosilicon is remelted in the upper area and flows to the lower area to perform reduction reaction, and the magnesium oxide and the calcium oxide do not need to be melted. If newly smelted molten ferrosilicon is added, the reaction of magnesium oxide is immediately contacted, so that magnesium vapor overflows from a charging port to burn.

4) The outside of the furnace lining of the reduction chamber is provided with a reduction chamber heat insulation layer built by clay bricks, so that the energy consumption can be reduced by heat insulation, and electric leakage is prevented, thereby avoiding personnel electric shock accidents.

5) The slag discharge port of the reduction chamber can be plugged by stemming in the production process, and the external outlet is covered with non-conductive clay refractory mortar and is propped against the occupied place by a stemming machine, so that the electric shock accident of personnel is avoided.

6) And the hydrochloride is arranged in the condensing tower for contact cooling, so that the condensing tower is safe and efficient.

Drawings

The following drawings are intended to be used in connection with the detailed description. In the accompanying drawings:

FIG. 1 is a schematic top view of a first embodiment;

FIG. 2 is a schematic cross-sectional view of AA of FIG. 1;

FIG. 3 is a schematic cross-sectional view of BB of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the CC of FIG. 1;

FIG. 5 is a schematic DD cross-sectional view of the condensing column of FIG. 1;

FIG. 6 is a schematic bottom view of a lining of a reduction chamber in example two;

FIG. 7 is a schematic view of the bottom surface of the lining of the reduction chamber in example three;

FIG. 7a is a schematic view in cross-section of the bottom of a lining of a reduction chamber according to the third embodiment

In the drawings, each label represents:

100-reduction chamber, 101-slag discharge port, 102-ferrosilicon charging port, 103-magnesia charging port, 104-first argon interface, 105-relief valve interface, 110-reduction chamber furnace shell, 120-reduction chamber heat insulation layer, 130-reduction chamber furnace lining, 131/133/135/-ferrosilicon furnace bottom, 132/134/136/-magnesia furnace bottom, 1351-diversion shallow groove, 151-anode bus and 152-cathode bus;

200-magnesium pool, 201-magnesium water outlet, 202-observation port, 203-second argon interface, 210-magnesium pool furnace shell, 220-magnesium pool furnace lining, 300-condensing tower, 301-vacuum pump interface, 302-coolant charging port, 310-condensing tower furnace shell, 320-condensing tower furnace lining, 410-first communicating pipe, 420-second communicating pipe, 501-refractory mortar, 601/602/603-reinforced concrete foundation.

Detailed Description

For a full understanding of the application, embodiments are described below in connection with the accompanying drawings.

Note that "one embodiment, some embodiments, and others" in this specification are used to distinguish between specific, mutually different embodiments, and do not refer to all embodiments in general.

Unless otherwise indicated, the "schematic" does not completely conform to the reality, and is only used to illustrate the technical features of the embodiments, and the proportions and dimensions observed from the schematic are not necessarily the technical features of the embodiments; "center, inner, outer, far, near, length, width, upper, lower, front, rear, left, right, top, bottom", etc. directions or positions are based on the viewing angle of the drawing, and are not to be construed as devices or components being configured or operated in a particular direction and orientation; the terms "first," "second," and "third," and the like, as used herein, are intended to have a meaning that is not intended to be sequential, as defined by a number of elements, structures, or components of the same general purpose name.

Example 1

Disclosed is a facility for smelting magnesium by a silicon thermal method, hereinafter referred to as facility.

Referring to fig. 1 and 2, the facility includes a reduction chamber 100, a condensing tower 300, and a magnesium pool 200. The reduction chamber 100 is used for reduction reaction of magnesia and ferrosilicon, the condensing tower 300 is used for cooling magnesium vapor, and the magnesium pool 200 is used for collecting liquid magnesium.

Referring to fig. 1, 2 and 3, the reduction chamber 100 includes a straight strip-shaped body and an arched top.

Specifically, the body of the reduction chamber 100 has a horizontally elongated square shape with an arched top that spans both longer sides of the body.

The reduction chamber 100 is provided on a reinforced concrete base 601. The outer surfaces of the side walls and the top of the reduction chamber 100 are provided as a steel reduction chamber furnace shell 110. The inner surface of the reduction chamber 100 is provided with a reduction chamber lining 130 of carbon refractory bricks (i.e. carbon bricks). When the carbon material is used for firing the carbon bricks, 10-15% of the carbon bricks are burned out and then are built into the reducing chamber furnace lining 130, so that the reducing chamber furnace lining 130 is prevented from being damaged in the baking process.

A refractory brick-built reduction chamber insulating layer 120 is arranged between the reinforced concrete base 601 and the reduction chamber furnace lining 130 and between the reduction chamber furnace shell 110 and the reduction chamber furnace lining 130. The reduction chamber insulation 120 is also electrically insulating, preventing leakage from the reduction chamber lining 130.

Top of the reduction chamber 100: a ferrosilicon feed port 102 and a magnesia feed port 103 are arranged at intervals, and a first argon gas interface 104, a relief valve interface 105, an anode bus 151 and a cathode bus 152 are also arranged.

The anode bus bar 151 and the cathode bus bar 152 are used to connect external heating power supply lines.

The anode bus 151 and the cathode bus 152 respectively pass through the reduction chamber furnace shell 110 and the reduction chamber heat insulation layer 120 and are electrically connected with heating elements arranged at preset positions inside the reduction chamber furnace lining 130. The heating element is a plurality of silicon carbon rod groups, silicon carbide plate groups or metal molybdenum plate groups.

The anode bus 151 and the cathode bus 152 are insulated from the through-hole side walls of the reduction chamber furnace shell 110 by refractory mortar 501.

Specifically, in the top projection view, the anode bus 151, the first argon gas port 104, the ferrosilicon feed port 102, the magnesia feed port 103, the blow-off valve port 105, and the cathode bus 152 are arranged in this order along the long axis of the top projection of the reduction chamber 100. Anode bus bar 151 and cathode bus bar 152 are located at both ends of reduction chamber 100 in the long axis direction of the plan view.

The bottom surface of the reduction chamber lining 130 comprises at least two regions. One of the upper zones, which carries the ferrosilicon charge fed from the ferrosilicon feed port 102, is called ferrosilicon hearth 131. The other lower zone, which is used to carry the ferrosilicon material flowing down from the upper zone and also to carry the magnesite material fed from the magnesite feed opening 103, is a reduction reaction zone, called a magnesite hearth 132.

The ferrosilicon hearth 131 and the magnesia hearth 132 are rectangular and are aligned along the long axis of the reduction chamber 100.

The area of the ferrosilicon hearth 131 is slightly larger than the area of the magnesite hearth 132. The center of the ferrosilicon furnace bottom 131 is opposite to the ferrosilicon charging port 102. The center of the magnesia hearth 132 is opposite to the magnesia feed opening 103.

A slag discharge port 101 for discharging reaction residues is provided in the bottom side wall of the reduction chamber 100. The slag tap 101 is a preform of carbon material with an internal opening in the magnesia hearth 132.

The slag tap 101 is plugged with stemming during the reduction reaction, the external opening is covered with refractory mortar 501, and the external opening of the slag tap 101 is occupied by a stemming roof. With the above structure, the electric shock accident of personnel caused by the electric leakage of the slag tap 101 can be prevented.

Referring to fig. 1, 2 and 5, the condensing tower 300 has a vertical cylindrical shape and is disposed on a reinforced concrete base 603. The side walls and top of the condensing tower 300 are provided with an outer surface as a steel condensing tower shell 310. The inner surface of the condensing tower 300 is provided with a refractory brick-built condensing tower lining 320.

The top side wall of the condensing tower 300 is provided with a vacuum pump interface 301. The condensing tower 300 is provided at the top center thereof with a coolant feed inlet 302. The interior of the condensing tower 300 is used to carry a coolant that contacts the cooled magnesium vapor. The coolant may be a mixture of potassium chloride and calcium chloride.

Referring to fig. 1, 2 and 4, magnesium pool 200 includes a cube-shaped body and an arched top, disposed on a reinforced concrete base 602. The side walls and top of the magnesium pool 200 are provided with an outer surface as a steel magnesium pool furnace shell 210. The inner surface of the magnesium pool 200 is provided with a refractory brick-built magnesium pool lining 220.

Top of magnesium pool 200: one side is communicated with the top of the reduction chamber 100 through a first communication pipe 410, and the opposite side is communicated with the bottom of the condensing tower 300 through a second communication pipe 420. The first communication pipe 410 and the second communication pipe 420 are located in the same horizontal plane and extend on the same straight line. With the above structure, the magnesium vapor generated by the reaction in the reduction chamber 100 enters the magnesium pool 200 through the first communicating pipe 410, is heated to be primarily cooled, then enters the bottom of the condensation tower 300 through the second communicating pipe 420, rises in the condensation pipe tower to be liquefied by the contact coolant, and the liquid magnesium and the molten coolant flow back into the magnesium pool through the second communicating pipe 420.

The bottom side wall of the magnesium pool 200 is provided with a magnesium water outlet 201 for discharging liquid magnesium and liquid coolant. The top of the magnesium pool 200 is provided with a centered viewing port 202 and a second argon port 203.

The construction process of the facility is briefly described below.

S11, building a reduction chamber 100

The reinforced concrete foundation 601 is firstly cast, the furnace body part of the reduction chamber furnace shell 110 is then constructed by steel, a circle of furnace bottom and furnace body are then built by clay bricks, a slag discharging port 101 prefabricated by carbon materials (such as carbon bricks) is arranged at a proper position, a circle of carbon bricks is further built as the reduction chamber furnace lining 130, and electric heating elements are arranged in the side wall and the bottom of the reduction chamber furnace lining 130. After the furnace body and the furnace bottom are built, an arch furnace top is built by means of wood boards, a circle of carbon bricks is built on the furnace top, a first communication pipe 410 prefabricated by magnesia refractory materials is installed at a proper position during the process, an anode bus 151 and a cathode bus 152 are installed, the anode bus 151 and the cathode bus 152 are made of metal nickel, a ferrosilicon charging port 102, a magnesia charging port 103, a first argon gas interface 104 and a relief valve interface 105 are reserved, and then clay refractory clay 501 is poured. The furnace roof portion of the reduction chamber shell 110 is fitted and tightly welded to the shaft portion. The argon bottle is connected with the first argon interface 104, the bleed valve interface 105 is provided with a bleed valve, and the anode bus 151 and the cathode bus 152 are respectively connected with a power supply circuit.

S12, building a magnesium pool 200

The reinforced concrete foundation 602 is cast first, then the shaft portion of the magnesia pool furnace shell 210 is constructed from steel, then a ring of the hearth and shaft are built from magnesia bricks, and during this time the magnesia refractory prefabricated magnesia water outlet 201 is fitted in place. After the furnace body and the furnace bottom are built, an arched furnace roof is built by wood boards, a circle of magnesia bricks are built on the furnace roof, a first communicating pipe 410 and a second communicating pipe 420 which are prefabricated by magnesia refractory materials are arranged at proper positions during the process, a second argon interface 203 and an observation port 202 are reserved, and magnesia refractory mud is poured. The roof portion of the magnesium pool shell 210 is fitted and tightly welded to the shell of the shaft. An argon bottle is connected to the second argon port 203.

S13, constructing a condensing tower 300

Firstly, a reinforced concrete foundation 603 is arranged, then, a furnace body part of the condensing tower furnace shell 310 is built by steel, then, a circle of furnace bottom and furnace body are built by magnesia bricks, a vacuum pump interface 301 is reserved at a proper position on the upper part of the furnace body, finally, a prefabricated furnace top (comprising the furnace top part of the condensing tower furnace shell 310) with a magnesium refractory material furnace lining with a coolant charging hole 302 is arranged, and the furnace top part of the condensing tower furnace shell 310 is tightly welded with the furnace body part. Finally, the vacuum pump is connected to the vacuum pump interface 301.

S14, air tightness detection is carried out, so that the problem of air leakage of equipment in the production process is solved.

Application example

Example one disclosed facility requires an oven after construction and prior to commissioning, the oven process is briefly described below.

S21, a magnesium drying pool 200 and a condensing tower 300

The stemming is blocked at the slag discharge port 101, then the stemming is discharged out of the stemming machine, a layer of clay refractory mortar 501 is covered outside the slag discharge port 101, and the stemming machine is used for propping against the slag discharge port 101; the argon valves of the reduction chamber 100 and the magnesia pool 200 are closed, the blow-off valve is closed, and the magnesia feed opening 103 is closed. Heavy oil is injected from a magnesium water outlet 201, the heavy oil is ignited from a viewing port, air is blown from a ferrosilicon charging port 102, and a viewing port 202 is closed. The magnesium pool 200 and the condensing tower 300 are heated to reach a process required temperature and then maintained for a predetermined time. The injection of heavy oil is stopped. The magnesium water outlet 201 is plugged with stemming.

S22, baking and reducing chamber 100

Closing the ferrosilicon charge port 102 and the coolant charge port 301, starting the vacuum pump to evacuate the furnace (i.e., the facility) air, turning on the power supply, generating heat when current passes through the heating elements in the reduction chamber lining 130, heating the reduction chamber lining 130 to the process required temperature, and then maintaining for a predetermined time.

Example one disclosed facility production process is briefly described below.

S31.

After the baking furnace is finished, an argon valve is opened to introduce argon into the furnace until positive pressure is reached, a ferrosilicon feed port 102 and a magnesia feed port 103 are opened, a thermocouple head is inserted into the furnace from one of the feed ports and is connected with temperature measuring equipment outside the furnace, and the monitoring of the temperature in the furnace is realized. High-temperature solid ferrosilicon is added from a ferrosilicon feed port 102, calcined high-temperature magnesium oxide and calcium oxide are added from a magnesia feed port 103, and the ferrosilicon feed port 102 and the magnesia feed port 103 are closed. The coolant feed inlet 302 is opened, sufficient calcium chloride or potassium chloride is added, and the coolant feed inlet 302 is closed.

S32

Closing the argon valve, starting the vacuum pump, and vacuumizing the furnace. The power is turned on to heat the reduction chamber 100, and the furnace temperature is up to 1350 ℃ to 1400 ℃. At this temperature, the ferrosilicon melts and flows to the lower magnesium oxide, and the ferrosilicon contacts the magnesium oxide and calcium oxide. Under the conditions of vacuum and high temperature, ferrosilicon reacts with magnesium oxide to produce molten iron, magnesium vapor and silicon dioxide, and the silicon dioxide and calcium oxide form slag.

S33

The magnesium vapor reaches the condensing tower 300 through the two communicating pipes, encounters calcium chloride and potassium chloride at normal temperature, and is cooled to magnesium water, and flows to the magnesium pool 200 through the second communicating pipe 420. While part of the calcium chloride and potassium chloride is melted by heating and also flows to the magnesium pool 200.

S34

After the reaction is completed, the power supply is cut off, and an argon valve is opened to introduce argon. The slag discharging port 101 is drilled by an opening machine to discharge molten iron and slag, after the molten iron and slag are discharged, part of magnesium vapor is sprayed out from the slag discharging port 101, the slag discharging port forms a flare, and when the magnesium vapor in the furnace is completely purged, the slag discharging port 101 is blocked by a stemming machine after the flare is not provided for the slag discharging port 101. And opening the bleeding valve, and purging the furnace until no flame is generated at the bleeding valve.

S35

And opening a magnesium water outlet 201 by using a tapping machine, and discharging the magnesium water, calcium chloride and potassium chloride solution, separating to obtain magnesium water, casting the magnesium water to obtain magnesium ingots, and cooling the calcium chloride and the potassium chloride for reuse. When no more magnesium water and calcium chloride and potassium chloride solution flow out, the stemming machine is used for plugging the magnesium water outlet 201.

S36

The coolant feed inlet 302 is opened and sufficient calcium chloride or potassium chloride is added. And (3) a stemming machine which exits the reduction chamber 100 is covered with a layer of clay refractory mortar 501 outside the slag discharge port 101, and then the clay refractory mortar is propped up by the stemming machine. The bleeding valve is closed, the ferrosilicon feed port 102 and the magnesia feed port 103 are opened, at this time ferrosilicon, magnesium oxide and calcium oxide can be added into the reduction chamber 100, and the above production steps are repeated.

Example one disclosed safety precaution for a facility is mainly:

n01 before exiting the stemming machine, discharging the slag and opening a bleeding valve to avoid the slag/magnesium vapor gushing;

n02. before opening each opening, the vacuum pump should be stopped and argon gas should be introduced until positive pressure (above atmospheric pressure); before starting the vacuum pump, all valves should be closed to ensure that air does not enter.

Example two

The facility was modified as follows on the basis of the first embodiment.

Referring to fig. 6, in the rectangular bottom surface of the reduction chamber lining 130, a ferrosilicon hearth 133 is located in the middle, and two magnesia hearth 134 are arranged on both sides of the ferrosilicon hearth 133. The interface between the ferrosilicon hearth 133 and the two magnesia hearth 134 is curved, thereby increasing the interface length.

Two magnesia feed inlets 103 are arranged at the top of the reduction chamber 100. The two magnesia feed inlets 103 are connected with the same magnesia supply pipeline and respectively correspond to one magnesia hearth 134.

Two slag discharging ports 101 are provided at the bottom of the reduction chamber 100. Two slag discharging ports 101 are respectively corresponding to one magnesia hearth 134.

Other aspects of the facility are substantially consistent with the first embodiment.

Implementation three

The facility was modified as follows on the basis of the first embodiment.

Referring to fig. 7, the body (shaft) of the reduction chamber 100 has a flat cylindrical shape. In the circular bottom surface of the reduction chamber lining 130, the ferrosilicon furnace bottom 135 is also circular, is positioned at the central part and is provided with a crisscross flow-guiding shallow groove 1351 on the surface. The bottom surface of each branch of the flow-directing shallow groove 1351 is gradually lowered in the radial direction. The magnesia hearth 136 is annular and surrounds the ferrosilicon hearth 135.

The top of the reduction chamber 100 is provided with three or four magnesia feed inlets 103. All magnesia feed inlets 103 are uniformly distributed in the circumferential direction and are connected with the same magnesia supply pipeline. The bottom of the reduction chamber 100 is provided with three or four slag outlets 101. All the slag discharge ports 101 are uniformly distributed in the circumferential direction.

In another embodiment, the location of the reduction chamber lining 130 corresponding to the heating element is replaced by a number of prefabricated graphite electrical heating elements in combination with the heating element.

In another embodiment, the reduction chamber lining 130 is made of a refractory material such as clay, high alumina, or magnesia. The reducing chamber lining 130 can be formed by a bricking method, or can be formed by pouring and baking. If the cooktop is not subjected to significant stress, a flat top may be used.

In another embodiment, the bottom cross section of the reducing chamber lining 130 is concave inverted triangle or minor arc, which can concentrate the reaction materials toward the middle.

In another embodiment, the reducing chamber 100 is not provided with a bleed valve interface 105 and a bleed valve, and the internal gas can be bled through the ferrosilicon feed port 102 or the magnesite feed port 103.

The above embodiments are intended to introduce the technical concept and features of the present application, so that those skilled in the art will understand and implement the technical solution of the present application, but do not constitute any limitation on the scope of the present application. Simple modifications or equivalent variations of the above embodiments are within the scope of the application.

Claims

1. The utility model provides a silicon thermal method magnesium smelting facility, includes a reduction chamber, a condensing tower and a magnesium pond, and the reduction chamber is used for the reduction reaction of magnesia material and ferrosilicon material, and the condensing tower is used for cooling magnesium vapour, and the magnesium pond is used for collecting liquid magnesium, characterized by:

2. The silicothermic magnesium production facility of claim 1 wherein said condensing tower: the top is provided with a coolant feed for carrying contact cooled hydrochloride coolant.

3. The silicothermic magnesium production facility of claim 1 wherein the top of the magnesium pool: one side is communicated with the top of the reduction chamber through a first communicating pipe, and the other side is communicated with the bottom of the condensation tower through a second communicating pipe.

4. The facility of claim 1, wherein the reduction chamber comprises a straight strip-shaped body in a bottom surface of a lining of the reduction chamber: the upper areas are opposite to the ferrosilicon charging holes, and each lower area is opposite to one magnesia charging hole.

5. The facility for producing magnesium by silicothermic process according to claim 1, wherein the top of the reduction chamber is provided with an argon gas interface, an anode bus and a cathode bus, and the anode bus and the cathode bus are connected with a heating power supply line and are respectively positioned at two ends of the reduction chamber in the long axis direction of the overlook projection.

6. The silicothermic magnesium production facility according to claim 1, wherein: the reducing chamber is arranged on the reinforced concrete base, the side wall of the reducing chamber and the outer surface of the top are provided with steel reducing chamber furnace shells, a reducing chamber heat insulation layer made of refractory materials is arranged between the reinforced concrete base and the reducing chamber furnace lining and between the reducing chamber furnace shells and the reducing chamber furnace lining, and slag discharging ports are formed in the reducing chamber heat insulation layer: is a carbon material preform, is plugged with stemming during the reduction reaction and covers the external opening with refractory mortar.

7. The silicothermic magnesium production facility of claim 1 wherein said condensing tower: the steel condensing tower furnace shell is arranged on the reinforced concrete base, the outer surfaces of the side wall and the top are provided with steel condensing tower furnace shells, and the inner surface is provided with a condensing tower furnace lining made of refractory materials.

8. The silicothermic magnesium production facility of claim 1 wherein said magnesium pool: the side wall and the outer surface of the top are provided with a steel magnesium pool furnace shell, and the inner surface is provided with a magnesium pool furnace lining made of refractory materials.