CN217230888U

CN217230888U - Short-process crude lead refining equipment

Info

Publication number: CN217230888U
Application number: CN202220792937.7U
Authority: CN
Inventors: 吴卫国; 许良; 周宝; 辛鹏飞
Original assignee: China ENFI Engineering Corp
Current assignee: China ENFI Engineering Corp
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-08-19
Anticipated expiration: 2032-04-07

Abstract

The utility model provides a short-process crude lead refining equipment. The short-process crude lead refining equipment comprises a refining furnace and a flue gas treatment unit, wherein the refining furnace is provided with a furnace chamber which is horizontally divided into a first refining area and a second refining area, and the bottoms of the first refining area and the second refining area are communicated; wherein the first refining area is used for refining and decoppering the crude lead to produce lead copper matte and decoppered crude lead; the upper part of the first refining zone is provided with a first heat supply unit; a cooling unit is arranged outside the first refining area, an external circulation flow path is also arranged in the first refining area, and the cooling unit is arranged on the external circulation flow path; the second refining area is used for oxidizing the decoppered lead bullion to remove arsenic, antimony and tin so as to form softened lead, and the second refining area is provided with an oxygen supply unit and a second heat supply unit. The utility model discloses effectively shortened the concise cycle of bullion, reduced the concise energy consumption of lead, reduced the project construction investment.

Description

Short-process crude lead refining equipment

Technical Field

The utility model relates to a lead bullion smelts technical field, particularly, relates to a short flow lead bullion refining equipment.

Background

The lead smelting enterprises in China all adopt electrolytic refining to produce refined lead. Before electrolytic refining, impurity elements are removed by primary fire refining of the crude lead produced by the smelting furnace, so that the content of elements such as copper, arsenic, antimony, tin and the like in the anode plate meets the requirement of the anode plate.

At present, the method for decoppering crude lead mainly comprises the steps of carrying out liquation copper removal and copper removal by adding sulfur in a lead melting pot according to batches, wherein copper elements are removed in the form of copper scum; and removing the copper element in the crude lead in the form of lead matte by a continuous decoppering furnace. For the crude lead with high arsenic, antimony and tin content, arsenic, antimony and tin also need to be removed after the copper removal operation is finished. The process of removing arsenic, antimony and tin from the crude lead is mainly carried out in a lead melting pot, and oxygen is blown into the crude lead in the lead melting pot or the crude lead is refined by adding alkali.

In patent publication No. CN 103924098B, a continuous refining furnace and a refining method for crude lead are disclosed, in which crude lead flows into a melting bath from a charging port, the crude lead is continuously cooled circularly by a circulating cooling device, a burner on the top of the furnace top continuously heats the melting bath to make the temperature of the upper part of the melting bath higher than that of the lower part, copper element in the crude lead is separated out, and lead matte is generated on the surface of the melting bath by reaction and separated from the crude lead. The lead copper matte can be directly sent to a copper converting system to recover copper element.

Patent No. CN 204058561U discloses a continuous refining furnace, the furnace bottom inclined section is provided with a cooling water jacket, and the side walls of the front end and the rear end are provided with burner ports. The refining furnace forms temperature gradient at the upper part and the lower part of a molten pool through furnace bottom cooling and molten pool surface heating, so that copper element in crude lead is separated out, and lead copper matte is formed on the surface of the molten pool for removal. The lead matte can be directly sent to a copper converting system to recover copper elements.

Patent No. CN 106756090 a discloses a continuous decoppering furnace for lead bullion and a continuous refining method for lead bullion, which employs a horizontal rotary decoppering furnace. Burners are arranged at two ends in the copper removing furnace to heat the surface of the molten pool, a residual electrode is added from a feed inlet of the copper removing furnace to reduce the temperature of the lower part of the molten pool, a temperature gradient is formed at the upper part and the lower part of the molten pool, copper elements are separated out from the molten pool, and lead copper matte is generated on the surface of the molten pool through reaction. The lead copper matte can be directly sent to a copper converting system to recover copper element.

Patent publication No. CN 102978416B discloses an apparatus and method for continuously removing copper from liquid lead bullion, which removes copper from the bullion in the form of copper dross. The copper dross can enter a copper converting system after being converted into lead matte by converting in a reverberatory furnace.

However, although the above-mentioned crude lead refining method realizes copper removal of crude lead, for crude lead with high arsenic, antimony and tin contents (As >0.4 wt%, Sb >1.2 wt% and Sn >0.2 wt%), after the copper removal operation is completed, it is necessary to pump the crude lead to a lead melting pot to remove arsenic, antimony and tin, and then the crude lead is cast into an anode plate, and then electrolytic refining is continued. In a word, the existing decoppering process cannot efficiently complete decoppering and arsenic, antimony and tin removal operations, and cannot directly produce crude lead meeting the component requirements of an anode plate.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a short flow crude lead refining equipment to solve among the prior art and refine arsenic, antimony, the high crude lead of tin content, the unable high-efficient problem of accomplishing decoppering and removing arsenic antimony tin.

In order to achieve the above objects, according to one aspect of the present invention, there is provided a short-process crude lead refining apparatus comprising a refining furnace having a furnace chamber horizontally partitioned into a first refining zone and a second refining zone, bottoms of the first refining zone and the second refining zone being communicated; the first refining area is used for refining and decoppering the crude lead to produce lead copper matte and decoppered crude lead, and is provided with a feed inlet and a lead copper matte outlet; the upper part of the first refining zone is provided with a first heat supply unit for heating the surface of a molten pool in the first refining zone; a cooling unit is arranged outside the first refining area, an external circulation flow path is also arranged in the first refining area, and the cooling unit is arranged on the external circulation flow path; the second refining area is used for carrying out oxidation removal on arsenic, antimony and tin on the decoppered lead bullion to form softened lead, the second refining area is provided with an oxygen supply unit for supplying oxygen to a molten pool in the second refining area and a second heat supply unit for heating the surface of the molten pool in the second refining area, and the second refining area is also provided with a lead outlet and an oxidation slag discharge port; the short-process lead bullion refining equipment also comprises a flue gas treatment unit connected with the first refining zone and the second refining zone.

Further, a partition wall is arranged in the refining furnace, and the furnace chamber is horizontally divided into a first refining area and a second refining area by the partition wall; wherein, the lower part of the partition wall is provided with a decoppering lead bullion channel which is communicated with the first refining area and the second refining area.

Further, the upper part of the partition wall is provided with a flue gas channel which is communicated with the first refining area and the second refining area; the top of the refining furnace is also provided with a smoke discharge port which is connected with a smoke processing unit.

Further, the refining furnace is a horizontal furnace, and the ratio of the length of the first refining zone to the length of the second refining zone is 2-4: 1 along the horizontal direction from the first refining zone to the second refining zone.

Furthermore, the position of the oxidizing slag discharge port is higher than the lead outlet, and the position of the lead matte outlet is higher than the lead outlet.

Furthermore, the lead outlets are arranged on the side wall of the second refining zone far away from the first refining zone, the height of the lead outlets from the bottom wall of the furnace chamber is denoted as H, and the total height of the inside of the furnace chamber is denoted as H, so that H/H is 1/3-1/2.

Further, the first heat supply unit and the second heat supply unit are both combustors.

Further, the first refining area is also provided with a slag removing opening.

Further, the flue gas treatment unit comprises a waste heat recovery device and a dust collecting device which are communicated in sequence.

Further, the dust collecting device is a cloth bag dust collector or an electric dust collector.

Adopt the utility model provides a short flow path crude lead refining equipment can realize copper, arsenic, antimony, tin element in the high-efficient desorption crude lead in a stove, and the direct output satisfies the crude lead of anode plate composition requirement. In the first refining zone, the bullion can be previously deprived of copper elements by refining to remove copper, and the copper elements are separated from the lead liquid in the form of lead matte. In the process, the arrangement of the first heat supply unit and the cooling unit ensures the temperature gradient of the upper part and the lower part of the molten pool in the refining copper removal process, so that copper elements of crude lead at the lower part of the molten pool and sulfides of copper float to the surface of the molten pool to generate lead copper matte, and the decoppered crude lead is positioned at the lower part of the molten pool to realize copper-lead separation. The decoppered lead bullion can enter a second refining area through a bottom channel, oxidation is completed under the action of oxygen supplied by an oxygen supply unit, arsenic, antimony and tin elements can be oxidized into slag in the process, and because arsenic, antimony and tin are oxidized and are volatile, part of the arsenic, antimony and tin can enter flue gas, and part of the arsenic, antimony and tin can enter oxidized slag to be removed. The flue gas can enter a subsequent flue gas treatment unit for treatment. Therefore, utilize the utility model discloses short flow path crude lead refining equipment can accomplish the desorption of copper, arsenic, antimony, tin impurity element in the crude lead in a stove high-efficiently, and direct output accords with the lead liquid that the anode plate required. The utility model discloses effectively shortened the concise cycle of bullion, reduced the concise energy consumption of lead, reduced the project construction investment.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a schematic block diagram of a short pass lead bullion refining plant according to one embodiment; and

figure 2 shows a top view of the short run lead bullion refining apparatus illustrated in figure 1.

Wherein the figures include the following reference numerals:

10. a refining furnace; 11. a first refining zone; 12. a second refining zone; 13. a first heat supply unit; 14. a cooling unit; 15. an oxygen supply unit; 16. a second heat supply unit; 17. a partition wall; 101. a feed inlet; 102. a lead matte outlet; 103. a lead outlet; 104. an oxidizing slag discharge port; 105. a flue gas discharge port; 106. a slag removing port.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As described in the background section, the prior art cannot accomplish decoppering and arsenic, antimony and tin removal efficiently in refining lead bullion with high arsenic, antimony and tin contents. In order to solve the problem, the utility model provides a short-flow crude lead refining equipment.

In a typical embodiment, as shown in fig. 1 and 2, the short-circuit crude lead refining apparatus includes a refining furnace 10, the refining furnace 10 having a furnace chamber horizontally partitioned into a first refining zone 11 and a second refining zone 12, the bottoms of the first refining zone 11 and the second refining zone 12 being communicated; wherein the first refining area 11 is used for refining and decoppering the crude lead to produce lead copper matte and decoppered crude lead, and the first refining area 11 is provided with a feed inlet 101 and a lead copper matte outlet 102; the upper part of the first refining zone 11 is provided with a first heat supply unit 13 for heating the surface of the molten bath in the first refining zone 11; a cooling unit 14 is arranged outside the first refining zone 11, the first refining zone 11 is also provided with an external circulation flow path, and the cooling unit 14 is arranged on the external circulation flow path and used for cooling the crude lead at the lower part of the molten pool and then conveying the crude lead back to the first refining zone 11; the second refining area 12 is used for carrying out oxidation removal on the copper-removed lead bullion to remove arsenic, antimony and tin so as to form softened lead, the second refining area 12 is provided with an oxygen supply unit 15 and a second heat supply unit 16, the oxygen supply unit 15 is used for supplying oxygen to a molten pool in the second refining area 12, and the second heat supply unit 16 is used for heating the surface of the molten pool in the second refining area 12; the second refining zone 12 is also provided with a lead outlet 103 and an oxidation slag discharge port 104. The short-process lead bullion refining equipment also comprises a flue gas treatment unit connected with the first refining area and the second refining area.

Adopt the utility model provides a short flow path crude lead refining equipment can realize copper, arsenic, antimony, tin element in the high-efficient desorption crude lead in a stove, and the direct output satisfies the crude lead of anode plate composition requirement. In the first refining zone, the bullion can be freed beforehand of copper elements by refining to remove copper, which can be separated from the lead bath in the form of lead matte. In the process, the arrangement of the first heat supply unit and the cooling unit ensures the temperature gradient of the upper part and the lower part of the molten pool in the refining and copper removing process, so that copper elements of crude lead at the lower part of the molten pool and sulfides of copper float to the surface of the molten pool to generate lead copper matte, and the copper-removed crude lead is positioned at the lower part of the molten pool to realize copper-lead separation. The decoppered lead bullion can enter a second refining area through a bottom channel, oxidation is completed under the action of oxygen supplied by an oxygen supply unit, arsenic, antimony and tin elements can be oxidized into slag in the process, and because arsenic, antimony and tin are oxidized and are volatile, part of the arsenic, antimony and tin can enter flue gas, and part of the arsenic, antimony and tin can enter oxidized slag to be removed. The flue gas can enter a subsequent flue gas treatment unit for treatment. Therefore, utilize the utility model discloses short flow path crude lead refining equipment can accomplish the desorption of copper, arsenic, antimony, tin impurity element in the crude lead in a stove high-efficiently, and direct output accords with the lead liquid that the anode plate required. The utility model discloses effectively shortened the concise cycle of bullion, reduced the concise energy consumption of lead, reduced the project construction investment. The lead decoppering refining process and the crude lead oxidation arsenic removal antimony tin removal process are completed in one refining furnace, the number of equipment is reduced, the occupied area is reduced, the configuration height difference is reduced, and the construction investment of equipment and plants is reduced. The two processes are completed in one furnace, so that the production efficiency is improved, and the consumption of operators and corresponding tools is reduced.

In a specific implementation, the crude lead and the sulfidizing agent can be fed into the first refining zone through a chute at the feeding port 101, and the decoppered crude lead at the lower part of the melting tank of the first refining zone can be circulated back to the first refining zone after passing through the cooling unit 14 through an external circulation flow path, and specifically, a lead pump can be arranged on the external circulation flow path to pump the lead to the cooling unit 14. By the cooperation of the cooling unit 14 and the first heat supply unit 13 or even the second heat supply unit 16, temperature gradients above and below the molten bath can be formed in the whole furnace chamber, and the decoppering refining is promoted to be more efficient. Specific cooling units 14 include, but are not limited to, water-cooled chutes or water-cooled coils, etc.

In a preferred embodiment, as shown in FIGS. 1 and 2, a partition wall 17 is provided in the refining furnace 10, and the partition wall 17 horizontally divides the furnace chamber into a first refining zone 11 and a second refining zone 12; wherein the lower part of the partition wall 17 is provided with a decoppered lead bullion passage which communicates the first refining zone 11 and the second refining zone 12. With the provision of the partition wall 17, the furnace chamber can be horizontally partitioned into the first refining zone 11 and the second refining zone 12. And because the lower part of the partition wall 17 is provided with a channel, the lead liquid at the lower part of the molten pool in the two areas can be communicated with each other. And the surface layer of the molten pool can be isolated so as to recover the lead matte produced in the first refining area 11 and the oxidizing slag produced in the second refining area 12 respectively. Preferably, the upper part of the partition wall 17 has a flue gas passage communicating the first refining zone 11 and the second refining zone 12; the top of the finer 10 is also provided with a flue gas discharge 105. So set up, the flue gas accessible gas discharge port 105 of output in two districts is discharged, and follow-up can get into flue gas processing unit in proper order, preferably includes waste heat recovery device and dust arrester installation (for example bag dust collector or electrostatic precipitator) in proper order, accomplishes waste heat recovery and gathers dust and handle. The obtained smoke dust also contains a part of oxides of arsenic, antimony and tin, and the oxides can be further recycled. In addition, the flue gas obtained after dust collection can be further sent to a flue gas purification unit for purification treatment, such as a desulfurization unit and the like, which are not described herein again.

In order to achieve more efficient decoppering and arsenic, antimony and tin removal, in a preferred embodiment, the refining furnace 10 is a horizontal furnace, and the ratio of the length of the first refining zone 11 to the length of the second refining zone 12 is 2-4: 1 in the horizontal direction from the first refining zone 11 to the second refining zone 12. With this arrangement, the copper in the lead bullion can be removed more sufficiently in the first refining zone 11, and then the arsenic, antimony and tin can be removed efficiently in the second refining zone 12. Particularly, through the arrangement, the lead copper matte and the oxidizing slag can be better separated, so that the copper residue in the oxidizing slag is less, the copper enrichment degree in the lead copper matte is better, and the comprehensive recovery of resources is more favorable. Preferably, the refining furnace 10 is a horizontal rectangular furnace body, which is built by refractory materials and is externally covered by a steel plate shell.

In the specific implementation process, the surface of a molten pool in the first refining area 11 is a lead matte layer, and the lower part of the molten pool is decoppered lead bullion; the surface of the molten pool in the second refining zone 12 is an oxidation slag layer, and softened lead liquid is arranged below the molten pool. In order to facilitate the discharge of the lead matte and the oxidized slag and the discharge of the lead liquid, in a preferred embodiment, the oxidized slag discharge port 104 is positioned higher than the lead outlet 103, and the lead matte outlet 102 is positioned higher than the lead outlet 103. Preferably, the lead outlets 103 are arranged on the side wall of the second refining zone 12 far away from the first refining zone 11, the height of the lead outlets 103 from the bottom wall of the furnace chamber is denoted as H, and the total height inside the furnace chamber is denoted as H, so that H/H is 1/3-1/2. The lead outlet 103 is arranged at the height, so that the liquid level of a molten pool in the specific production process is more suitable, better temperature distribution is formed in the heating process and the cooling process below the molten pool, and the stability and the high efficiency in the crude lead refining process are more favorable.

The above-mentioned type of heating unit may be of a type commonly used in the art, and for more convenient operation, it is preferable that both the first heating unit 13 and the second heating unit 16 are burners. The liquid level of the molten pool can be directly heated through the burner, the burner of the burner can be used for cooling the surface of the molten pool, the operability is strong, and the heat supply efficiency is higher.

In practice, it is inevitable that small amounts of copper react with the elements arsenic, antimony and tin to form dross, which can float on the surface of the bath in the first refining zone 11. in a preferred embodiment, the first refining zone 11 is further provided with a slagging-off opening 106. The scum can be cleaned regularly through the scum outlet 106, and the adhesion of the scum in the furnace body is reduced.

In order to facilitate the stable discharge of the lead liquid after the removal of arsenic, antimony and tin in the second refining zone 12, the lead outlet 103 is preferably a siphon outlet. The lead liquid components can be regularly monitored in the actual production process, and if the lead liquid components after sampling and analyzing meet the component requirements of the anode plate for electrolytic refining, the lead liquid components can be discharged from a siphon port and sent to the anode plate casting process.

According to another aspect of the utility model, still provide a bullion refining method, it adopts above-mentioned lead refining device to carry out lead refining, and lead refining method includes following step: adding a vulcanizing agent together with the crude lead into a first refining area 11 through a feeding hole 101 for refining and copper removal to obtain lead copper matte and decoppered crude lead, heating the surface of a molten pool in the first refining area 11 through a first heat supply unit 13 during reaction, and heating the surface of the molten pool in a second refining area through a second heat supply unit 16 so as to enable the temperature of a hearth of a refining furnace to be 1280-1320 ℃; cooling the lead bullion at the lower part of the molten pool in the first refining zone 11 through a cooling unit 14 arranged on the external circulation flow path, and then conveying the lead bullion back to the first refining zone 11 so as to maintain the temperature of the molten pool in the first refining zone 11 at 350-450 ℃; discharging the lead copper matte through a lead copper matte outlet 102; when the copper content of the molten lead at the lower part of the molten pool in the first refining zone 11 is less than 0.06 wt%, supplying oxygen to the molten pool in the second refining zone 12 through an oxygen supply unit 15 to oxidize the copper-removed lead bullion, so that arsenic, antimony and tin in the molten lead are oxidized and separated out to carry out slag-liquid separation to obtain softened lead and oxidized slag, discharging the softened lead through a lead outlet 103, and discharging the oxidized slag through an oxidized slag outlet 104.

By using the crude lead refining method provided by the utility model, copper, arsenic, antimony and tin elements in the crude lead can be efficiently removed in one furnace, and softened lead meeting the component requirements of the anode plate is directly produced. In the first refining zone, the lead bullion can be freed beforehand of copper elements by refining copper removal, the copper elements being separated from the lead bath in the form of lead matte (lead matte). In the process, the arrangement of the first heat supply unit, the second heat supply unit and the cooling unit ensures the temperature gradient of the upper part and the lower part of a molten pool (the temperature of a hearth ranges from 1280 ℃ to 1320 ℃ and the temperature of the molten pool ranges from 350 ℃ to 450 ℃) in the refining and copper removal process, so that copper elements of crude lead at the lower part of the molten pool and sulfides of copper float to the surface of the molten pool to generate lead copper matte, and the decoppered crude lead is positioned at the lower part of the molten pool to form copper-lead separation. The decoppered lead bullion can enter a second refining area through a bottom channel, oxidation is completed under the action of oxygen supplied by an oxygen supply unit, and arsenic, antimony and tin elements can be oxidized into slag in the process, and the reaction is as follows:

2As+1.5O ₂ ＝As ₂ O ₃

2Sb+1.5O ₂ ＝Sb ₂ O ₃

Sn+O ₂ ＝SnO ₂

and because the arsenic, antimony and tin are oxidized and are easy to volatilize, part of the arsenic, antimony and tin can enter the flue gas, and the other part of the arsenic, antimony and tin can enter the oxidizing slag to be removed. Therefore, the crude lead refining method of the utility model can efficiently remove the impurity elements such as copper, arsenic, antimony and tin in the crude lead in a furnace, and directly produce the lead liquid meeting the requirements of the anode plate. The utility model discloses effectively shorten the concise cycle of bullion, reduced the concise energy consumption of lead, reduced the project construction investment.

During the copper removal in the refining, the copper content in the decoppered bullion in the lower part of the molten bath in the first refining zone 11 is monitored, and after the copper content is less than 0.06%, oxygen is supplied to the molten bath in the second refining zone 12 through an oxygen supply unit 15 to perform the oxidation process. Thus, after the decoppering refining meets the requirement of the electrolytic refining anode plate on copper content, the arsenic, antimony and tin can be removed by oxidation. In the specific oxidation process, preferably, the oxygen supply unit 15 is an oxygen spray gun or an oxygen lance; when an oxygen spray gun is adopted, the oxygen spray gun is arranged at the lower part of the second refining area 12; when an oxygen lance is used, the oxygen lance is extended to the lower portion of the molten bath in the second refining zone 12. Specifically, an oxygen lance insertion opening may be provided at an upper portion of the furnace wall at a height above the bath level, and the oxygen lance is inserted into the lower bath of the second refining zone from the oxygen lance insertion opening.

The oxygen supply unit 15 is used for supplying oxygen, and during the oxidation process, the oxygen pressure of the oxygen supply unit 15 is preferably controlled to be 0.3-0.5 Mpa. Therefore, the method is beneficial to fully oxidizing the impurity elements such as arsenic, antimony, tin and the like into the slag, and can slightly stir the molten pool in a proper state, so that the oxidizing slag floats upwards to be enriched on the surface of the molten pool while the oxidizing impurity removal efficiency is improved, and the impurity separation is completed. Preferably, in the oxidation process, the bullion refining method further comprises: and monitoring the content of arsenic, antimony and tin in the softened lead at the lower part of the molten pool of the second refining zone 12, stopping supplying oxygen after the content of antimony reaches 0.4-0.8 wt%, the content of tin reaches 0.05-0.2 wt% and the content of arsenic is less than 0.4 wt%, and discharging the softened lead. Thus, the discharged softened lead can be directly used as an anode plate material for electrolytic refining.

In a preferred embodiment, during the copper removal process of the refining, the dross on the surface of the molten pool is removed at intervals through the dross removal port 106. More preferably, the method for refining the crude lead further comprises the step of discharging flue gas generated in the refining copper removal process and the oxidation process from the flue gas discharge port 105, and then sequentially feeding the flue gas into a waste heat recovery system and a dust collection system so as to recover waste heat and collect dust.

Such sulfiding agents include, but are not limited to, one or more of pyrite, sulfur, and lead sulfide. The specific addition amount of the vulcanizing agent can be determined according to the copper and sulfur content in the crude lead, and the mass ratio of the total sulfur amount in the vulcanizing agent and the crude lead to the copper in the crude lead is preferably kept at 1: 2.

The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.

Example 1

The short-process crude lead refining equipment shown in fig. 1 and 2 is adopted to carry out refining decoppering and arsenic, antimony and tin removal on the following crude lead, wherein the crude lead is smelted crude lead and comprises the following components in percentage by weight: pb, 95%; cu, 1.50%; as, 0.6%; 1.5 percent of Sb; s, 0.20%; 1.2 percent of other elements and 60t of crude lead.

The short-process crude lead refining equipment is a horizontal rectangular refining furnace, a furnace chamber is divided into two areas by a partition wall, namely a copper removal area (a first refining area) and an arsenic, antimony and tin removal area (a second refining area), and the length ratio of the two areas is 3: 1. The copper removing area is communicated with a molten pool at the lower part of the arsenic-antimony-tin removing area for the circulation of crude lead in the copper removing area and the arsenic-antimony-tin removing area; the upper melting pool is separated by a partition wall, and the smoke areas are communicated. The copper removing area is provided with a feed inlet, a lead matte outlet and a slag removing port; the arsenic-antimony-tin removing area is provided with a lead outlet and an oxidizing slag outlet, the lead matte outlet, the slag removing opening and the oxidizing slag outlet are all higher than the lead outlet, and the distance between the lead outlet and the bottom wall of the furnace body is 1/2 of the height of the whole furnace. The lead outlet is a siphon inlet. And the crude lead flows into the refining furnace through the chute, the crude lead at the lower part of the copper removing area is pumped to a cooling device outside the furnace through a lead pump, and the crude lead is cooled and returned to the copper removing area. Burners are arranged at two ends of the refining furnace to continuously heat the surface of the molten pool. The arsenic antimony tin zone is provided with an oxygen supply device which is an oxygen lance, oxygen is blown into a molten pool at the lower part of the arsenic antimony tin zone to oxidize arsenic antimony tin in the crude lead, partial oxides are volatilized to enter smoke dust, and partial oxides enter oxidation slag to be removed.

The specific operation process comprises the following steps:

(1) about 400kg of pyrite and 129kg of sulfur are added into a melting pool of a crude lead refining furnace along with smelting crude lead, and the temperature above the melting pool in the two zones is controlled to be 1280-1320 ℃ by a burner.

(2) And the crude lead in the copper removing area is cooled to 350-450 ℃ by a cooling device outside the furnace and then returns to the melting pool in the copper removing area. Copper-containing sulfide formed by decoppering and refining (including liquating to remove copper and adding sulfur to remove copper) of the crude lead at the lower part of the copper removing area floats to the surface of the molten pool, and lead copper matte is generated.

(3) After decoppering and refining, the copper content of the crude lead at the lower part of the arsenic-antimony-tin removing area is reduced to be below 0.06 percent. Blowing oxygen into a molten pool at the lower part of the arsenic-antimony-tin removing area, wherein the oxygen pressure is 0.3MPa, and the oxygen blowing amount is 300Nm ³ Left and right. As the oxidation of antimony and tin is exothermic reaction, the external circulation cooling rate of the crude lead needs to be increased in order to keep the temperature of the lower part of a molten pool between 350 ℃ and 450 ℃.

(5) After the arsenic, antimony and tin of the crude lead are removed, the components of the crude lead meet the component requirements of an anode plate of electrolytic refining (namely, Cu is less than 0.06 percent, Sb0.4-0.8 percent and Sn is 0.05-0.2 percent), namely softened lead is obtained below a molten pool. And then the softened lead is discharged from a lead outlet and sent to an anode plate casting process.

(6) The upper temperature of a refining furnace molten pool is controlled to be 1100-1200 ℃, when the thickness of the lead copper matte layer reaches a discharge liquid level, the lead copper matte layer is discharged from a lead copper matte port, and the components of the lead copper matte layer comprise Cu, 41 wt%, Pb, 15 wt%, Fe, 8.5 wt%, S, 15 wt%, As 1.7%, Sb 4.3%, Sn 0.86% and the balance of impurities.

(7) In the treatment process, scum produced in the refining process is periodically raked out from a scum hole to prevent slagging. The operation is continuously carried out on the 60t smelting crude lead, the refining device is stable and efficient to operate, softened lead required by an anode plate of electrolytic refining can be directly produced, and the obtained softened lead comprises the following components: 0.06 percent of Cu, 0.4 to 0.8 percent of Sb, 0.05 to 0.2 percent of Sn, 0.4 percent of As and 98.5 percent of Pb.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A short-run lead bullion refining plant, characterized in that the short-run lead bullion refining plant comprises a refining furnace (10), the refining furnace (10) having a furnace chamber horizontally divided into a first refining zone (11) and a second refining zone (12), the bottoms of the first and second refining zones (11, 12) communicating; wherein the content of the first and second substances,

the first refining zone (11) is used for refining and decoppering the crude lead to produce lead copper matte and decoppered crude lead, and the first refining zone (11) is provided with a feed inlet (101) and a lead copper matte outlet (102); the upper part of the first refining zone (11) is provided with a first heat supply unit (13) for heating the surface of a molten pool in the first refining zone (11); a cooling unit (14) is arranged outside the first refining zone (11), an external circulation flow path is also arranged in the first refining zone (11), and the cooling unit (14) is arranged on the external circulation flow path;

the second refining zone (12) is used for carrying out oxidation removal on arsenic, antimony and tin on the decoppered lead bullion to form softened lead, the second refining zone (12) is provided with an oxygen supply unit (15) for supplying oxygen to a molten pool in the second refining zone (12) and a second heat supply unit (16) for heating the surface of the molten pool in the second refining zone (12), and the second refining zone (12) is further provided with a lead outlet (103) and an oxidation slag outlet (104);

the short-process lead bullion refining equipment also comprises a flue gas treatment unit which is connected with the first refining area (11) and the second refining area (12).

2. The short-circuit lead bullion refining plant of claim 1, characterized in that a partition wall (17) is provided within the refining furnace (10), said partition wall (17) horizontally dividing the furnace chamber into the first refining zone (11) and the second refining zone (12); wherein the lower part of the partition wall (17) is provided with a copper-removing lead bullion passage which is communicated with the first refining zone (11) and the second refining zone (12).

3. A short process lead bullion refining plant as defined in claim 2, characterized in that the upper part of said partition wall (17) has a flue gas passage communicating said first refining zone (11) and said second refining zone (12); the top of the refining furnace (10) is also provided with a flue gas discharge port (105), and the flue gas discharge port (105) is connected with the flue gas treatment unit.

4. The short flow lead bullion refining plant of any one of claims 1 to 3, characterized in that the refining furnace (10) is a horizontal furnace, and the ratio of the length of the first refining zone (11) to the length of the second refining zone (12) is 2-4: 1 in the horizontal direction from the first refining zone (11) to the second refining zone (12).

5. The short-circuit lead bullion refining plant of claim 4, characterized in that the oxidizing slag discharge port (104) is located higher than the lead tap (103), and the lead matte outlet (102) is located higher than the lead tap (103).

6. The short-process lead bullion refining apparatus of claim 5, wherein the lead outlets (103) are disposed on the side wall of the secondary refining zone (12) away from the primary refining zone (11), and H/H is 1/3-1/2 when the height of the lead outlets (103) from the bottom wall of the furnace chamber is H and the total height of the inside of the furnace chamber is H.

7. A short circuit lead bullion refining plant as claimed in any one of claims 1 to 3, characterized in that the first heat supply unit (13) and the second heat supply unit (16) are both burners.

8. A short pass lead bullion refining plant as defined in any one of claims 1 to 3, wherein the first refining zone (11) is further provided with a slag raking port (106).

9. The short-circuit lead bullion refining plant of any one of claims 1 to 3, wherein the flue gas treatment unit comprises a waste heat recovery device and a dust collection device in serial communication.

10. The short run lead bullion refining apparatus of claim 9, wherein the dust collection device is a bag house or an electric precipitator.