Formula for roasting zinc concentrate in fluidized bed furnace by matching multiple mineral types

Abstract

The invention provides a formula for roasting zinc concentrate in a fluidized bed furnace by matching multiple mineral types, and relates to the technical field of zinc concentrate roasting. The formula for roasting the zinc concentrate in the fluidized bed furnace matched with multiple minerals is suitable for a roasting furnace with the area of 50-142 m < 2 > and comprises the following components: 48-55% of Zn, 2.2-2.3% of Pb, 1.5-3% of S , 3-5% of Fe, 1.5-1.8% of Cu and 9-10% of water. The roasting efficiency is improved, the roasting process is smoother due to the fact that the roasted sand is uniform in particle size and not prone to blocking a hood and a rear system, and production interruption caused by blocking and other problems is reduced. And the service life of the roasting furnace is prolonged, the low-temperature co-melting body is prevented from adhering to the internal structure of the roasting furnace, the damage to components such as a hearth and a hood is reduced, and the maintenance cost is reduced. From the view of production operation records, the shutdown time of the fluidized bed furnace caused by roasting problems is shortened, the production stability and continuity of the whole sulfuric acid device are improved, and the economic benefits are increased.

Description

Technical Field

[0001] The invention relates to the technical field of zinc concentrate roasting, and in particular to a formula for roasting zinc concentrate in a fluidized bed furnace using multiple mineral species. Background Art

[0002] Zinc concentrate is generally produced from lead-zinc ore or zinc-containing ore through crushing, ball milling, foam flotation and other processes to produce an ore with a high zinc content that meets national standards. Zinc concentrate is the main raw material for producing metallic zinc and zinc compounds. Metallic zinc is mainly used to produce copper alloys, lead alloys, magnesium alloys, lead-zinc alloys and zinc compounds for use in steel, metallurgy, machinery, electrical, chemical, light industry, military and medicine.

[0003] In the roasting process of zinc concentrate, the traditional formula may have some problems, such as uneven particle size of roasted sand, easy formation of large particles to block the hood and the back system, and the formation of low-temperature eutectic body to adhere to the internal structure of the roasting furnace, affecting the normal operation and production efficiency of the roasting furnace. Therefore, a new formula is needed to solve these problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a formula for roasting zinc concentrate in a fluidized bed furnace using multiple mineral species, which solves the problems raised by the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented by the following technical scheme: a formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, suitable for areas of 50-142m 2 The composition of the calcined aluminum alloy includes: Zn: 48-55%, Pb: 2.2-2.3%, Si: 1.5-3%, Fe: 3-5%, Cu: 1.5-1.8%, and moisture 9-10%.

[0008] Preferably, the formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species comprises: Zn: 50-55%, Pb: 2.2-2.3%, Si: 2-3%, Fe: 4-5%, Cu: 1.6-1.8%, and moisture 9-10%.

[0009] Preferably, the formula for roasting zinc concentrate in a fluidized bed furnace using multiple mineral species comprises: Zn: 52%, Pb: 2.3%, Si: 2%, Fe: 4%, Cu: 1.7%, and moisture: 10%.

[0010] Preferably, the Pb and Si are combined with oxygen to form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. By adjusting the ratio of PbO and SiO2, the particle size of the produced roasted sand is uniform, and it is not easy to form large particles to block the hood and the rear system, and it is not easy to form a low-temperature eutectic body to adhere to the internal structure of the roasting furnace.

[0011] Preferably, the roasting temperature of the roasting furnace is 880-960°C.

[0012] Preferably, the roasting time of the roasting furnace is 2-4 hours for each batch of materials to stay in the furnace.

[0013] (III) Beneficial effects

[0014] The present invention provides a formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, which has the following beneficial effects:

[0015] 1. The roasting efficiency is improved. Since the roasted sand particle size is uniform and not easy to clog the air hood and the rear system, the roasting process is smoother and the production interruption caused by blockage and other problems is reduced.

[0016] 2. It prolongs the service life of the roasting furnace, avoids the low-temperature eutectic body from sticking to the internal structure of the roasting furnace, reduces the damage to the furnace, hood and other components, and reduces the maintenance cost. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Embodiment 1:

[0019] The embodiment of the present invention provides a formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, which is suitable for an area of ​​50m 2 The roasting temperature of the roasting furnace is 880°C, and the roasting time of the roasting furnace is 2 hours for each batch of materials to stay in the furnace. Its composition includes: Zn: 48%, Pb: 2.2%, Si: 1.5%, Fe: 3%, Cu: 1.5%, and moisture 9%.

[0020] Among them, the Pb and Si are combined with oxygen to form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. By adjusting the ratio of PbO and SiO2, the particle size of the produced roasted sand is uniform, and it is not easy to form large particles to block the hood and the rear system, and it is not easy to form a low-temperature eutectic body to adhere to the internal structure of the roasting furnace.

[0021] To summarize, the main thing to adjust is the ratio of PbO and SiO2. The combination of PbO and SiO2 will form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. With the increase of PbO in the eutectic, its melting point also decreases. At the same time, the interaction with Cu, Fe, and Zn, the chance of forming large particles and other factors and practices will eventually form a more suitable formula.

[0022] Embodiment 2:

[0023] The embodiment of the present invention provides a formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, which is suitable for an area of ​​80m 2 The roasting temperature of the roasting furnace is 900°C, and the roasting time of the roasting furnace is 3 hours for each batch of materials to stay in the furnace. Its composition includes: Zn: 50%, Pb: 2.2%, Si: 2%, Fe: 4%, Cu: 1.6%, and moisture 9%.

[0024] Among them, the Pb and Si are combined with oxygen to form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. By adjusting the ratio of PbO and SiO2, the particle size of the produced roasted sand is uniform, and it is not easy to form large particles to block the hood and the rear system, and it is not easy to form a low-temperature eutectic body to adhere to the internal structure of the roasting furnace.

[0025] To summarize, the main thing to adjust is the ratio of PbO and SiO2. The combination of PbO and SiO2 will form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. With the increase of PbO in the eutectic, its melting point also decreases. At the same time, the interaction with Cu, Fe, and Zn, the chance of forming large particles and other factors and practices will eventually form a more suitable formula.

[0026] Embodiment three:

[0027] The embodiment of the present invention provides a formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, which is suitable for an area of ​​110m 2 The roasting temperature of the roasting furnace is 930℃, and the roasting time of the roasting furnace is 3 hours for each batch of materials to stay in the furnace. Its composition includes: Zn: 52%, Pb: 2.3%, Si: 2%, Fe: 4%, Cu: 1.7%, and moisture 10%.

[0028] Among them, the Pb and Si are combined with oxygen to form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. By adjusting the ratio of PbO and SiO2, the particle size of the produced roasted sand is uniform, and it is not easy to form large particles to block the hood and the rear system, and it is not easy to form a low-temperature eutectic body to adhere to the internal structure of the roasting furnace.

[0029] To summarize, the main thing to adjust is the ratio of PbO and SiO2. The combination of PbO and SiO2 will form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. With the increase of PbO in the eutectic, its melting point also decreases. At the same time, the interaction with Cu, Fe, and Zn, the chance of forming large particles and other factors and practices will eventually form a more suitable formula.

[0030] Embodiment 4:

[0031] The embodiment of the present invention provides a formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, which is suitable for an area of ​​140m 2 The roasting temperature of the roasting furnace is 960℃, and the roasting time of the roasting furnace is 4 hours for each batch of materials to stay in the furnace. Its composition includes: Zn: 55%, Pb: 2.3%, Si: 3%, Fe: 5%, Cu: 1.8%, and moisture 10%.

[0032] Among them, the Pb and Si are combined with oxygen to form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. By adjusting the ratio of PbO and SiO2, the particle size of the produced roasted sand is uniform, and it is not easy to form large particles to block the hood and the rear system, and it is not easy to form a low-temperature eutectic body to adhere to the internal structure of the roasting furnace.

[0033] To summarize, the main thing to adjust is the ratio of PbO and SiO2. The combination of PbO and SiO2 will form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2. With the increase of PbO in the eutectic, its melting point also decreases. At the same time, the interaction with Cu, Fe, and Zn, the chance of forming large particles and other factors and practices will eventually form a more suitable formula.

[0034] Production Application:

[0035] In actual production, after the formula was adjusted in May 2022, it was applied to an area of ​​142m 2 From the production and operation records of the sulfuric acid unit, it was found that the shutdown time for cleaning the boiling furnace was greatly reduced.

[0036] In 2022, the boiling furnace was frequently shut down for maintenance due to various reasons, such as cooling cylinder failure, material accumulation in the boiling furnace, purification and leak repairing, etc. The shutdown time was long and frequent.

[0037] In 2023, after using the new formula, although there were still shutdowns due to power grid failures and boiler maintenance, the shutdowns specifically for the fluidized bed furnace due to roasted sand problems were significantly reduced. For example, on January 23, 2023, the shutdown lasted 4 hours and 40 minutes due to a power grid entrance failure, and on February 7, the shutdown lasted 5 hours and 20 minutes due to a power outage. These shutdowns were mainly caused by external factors or routine maintenance of the boiler itself, rather than roasted sand blockage or adhesion problems.

[0038] In summary, the roasting efficiency is improved. Since the roasted sand has a uniform particle size and is not easy to clog the hood and the back system, the roasting process is smoother, reducing production interruptions caused by blockages and other problems. The service life of the roasting furnace is extended, the low-temperature eutectic body is prevented from sticking to the internal structure of the roasting furnace, and the damage to the furnace, hood and other components is reduced, reducing maintenance costs. From the production operation records, the shutdown time of the boiling furnace due to roasting problems is reduced, the production stability and continuity of the entire sulfuric acid unit are improved, and the economic benefits are increased.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species, characterized by: Applicable to areas between 50-142m 2 The composition of the calcined aluminum alloy includes: Zn: 48-55%, Pb: 2.2-2.3%, Si: 1.5-3%, Fe: 3-5%, Cu: 1.5-1.8%, and moisture 9-10%.

2. The formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species according to claim 1, characterized in that: Its ingredients include: Zn: 50-55%, Pb: 2.2-2.3%, Si: 2-3%, Fe: 4-5%, Cu: 1.6-1.8%, and water 9-10%.

3. The formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species according to claim 2, characterized in that: Its composition includes: Zn: 52%, Pb: 2.3%, Si: 2%, Fe: 4%, Cu: 1.7%, and water 10%.

4. The formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species according to claim 3, characterized in that: The Pb and Si cooperate with oxygen and combine to form PbO·SiO2, 2PbO·SiO2, and 3PbO·SiO2.

5. The formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species according to claim 1, characterized in that: The roasting temperature of the roasting furnace is 880-960°C.

6. The formula for roasting zinc concentrate in a fluidized bed furnace with multiple mineral species according to claim 5, characterized in that: The roasting time of the roasting furnace is 2-4 hours for each batch of materials to stay in the furnace.