JP2010053376A - Briquette manufacturing method, reduced iron manufacturing method, and method for separation of zinc or lead - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture briquettes with increased strength, even when using minimal quantities of binder and water. <P>SOLUTION: The briquette manufacturing method includes a process where an iron oxide raw material and/or a carbonaceous substance are crushed; a process where primary particulates are formed using the iron oxide raw material and the carbonaceous substance; and a process where multiple primary particulates are pressurized to be molded into secondary particulates. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing an agglomerate (briquette) using iron ore containing iron oxide and a dust raw material, a method for producing reduced iron from the obtained agglomerate, and zinc, lead, etc. The present invention can be applied to a method for separating and recovering volatile metals.

  Of course, iron ore raw materials are also used as raw materials for producing reduced iron. However, due to the price increase accompanying the recent increase in demand for iron ore raw materials, dust containing iron raw materials generated in ironworks is recycled. It is attracting attention. In the ironmaking and steelmaking processes, dust containing powdered iron and iron oxide blown up in a blast furnace, converter, melting furnace, electric furnace or the like is collected by a dust collector. The recovered powder (described as “steel-making dust” in the claims and specification) contains iron and iron oxide, and thus is used as an iron raw material.

  In a rotary hearth furnace, one of the production facilities for reduced iron, it is necessary to supply raw materials containing metal oxides and carbonaceous materials as agglomerates in order to make the reduction reaction uniform. It is necessary to have a certain strength. However, when a carbonaceous material is included, since carbon burns even at a relatively low temperature, a method for increasing the strength of the agglomerated material by sintering cannot be taken like sintered pellets and sintered ore. For this reason, the intensity | strength of the agglomerate was raised by using expensive binders (henceforth a "binder" may be described hereafter), such as starch and molasses.

  As equipment for producing agglomerated materials, it is common to use either pellet production equipment or briquette production equipment. In both of these equipments, agglomerates having a uniform size and high strength are possible. Need to manufacture. However, it was very difficult to produce an agglomerated material of fine powder material mainly for the following two reasons. The first is that it is difficult to produce a strong agglomerated material because the fine dust raw material has a small bulk density and a large number of voids. If the strength of the agglomerated material is low, it cannot be stored in large quantities because it may collapse due to pressure, and cracks and the like also occur during transportation. Second, in order to increase the strength of the agglomerated material, a fine powder raw material is mixed with a binder, but it is difficult to uniformly mix the binder. This is because the binder has the function of an adhesive and thus has a viscosity, which prevents uniform mixing. In addition, the binder material itself is expensive, and since it has an adhesive function, it may cause clogging of the material in the production or supply process (for example, an intermediate hopper) of the agglomerated material. If the raw materials are clogged, the operation of the reduction furnace becomes unstable when the supply of raw materials to the rotary hearth furnace is interrupted or suddenly supplied in large quantities. Therefore, it is desired to reduce the amount of binder used as much as possible.

  Hereinafter, a conventionally known method for producing fine dust particles and a method for producing briquettes will be described.

In Patent Document 1, as shown in FIG. 1 of the same Patent Document, the raw material discharged from the raw material storage tank is kneaded by a kneading apparatus, and particles containing metal oxide and carbon are used as raw materials, and pellets are produced by a bread granulator. A method of manufacturing is known. In detail, a mixing ratio is determined from a plurality of raw material storage bins, and a plurality of raw materials are cut out on a raw material conveyor. The mixing ratio of the raw material particle size, chemical composition, and water content is determined. In particular, in order to appropriately perform the reduction reaction, the ratio of metal oxide to carbon is adjusted.
In addition, the scope of claims of Patent Document 1 includes a metal oxide containing steelmaking dust and a powder containing carbon-containing powder when producing spherical pellets with a bread granulator. A method for producing a pellet for a reduction furnace is described, wherein the powder contains 20 to 80% of particles having a particle size of 10 μm or less.

Patent Document 2 describes a method for producing a solidified product from steelmaking dust as shown in FIG. As can be seen in this figure, in this system, the dust that is mainly composed of iron and its oxides produced in the steel production process is mixed with the powder that is mainly composed of carbon, and granulated into pellets. Process, a water impregnation process for impregnating the mixed granulated body with water, a solidification process for forming a briquette by putting the water-impregnated pellets into a mold and press-molding, and this briquette into a melting furnace The zinc concentration of the dust is concentrated between the process of transporting as a raw material and the solidification process after the dust is obtained from the melting furnace, and the zinc in the concentrated state is dezinced. It includes processing steps. Furthermore, in this method, the surface of the mixed granulated body is softened by impregnating with water just before molding, and the granulated body is easily deformed during briquetting molding, thereby increasing the adhesive strength between the granulated bodies. Can do.
JP 2002-206120 A JP 2007-270229 A

  Usually, in a reduction furnace for reducing iron oxide, it is necessary to perform a homogeneous reduction reaction, so that the agglomerate supplied to the reduction furnace needs to be uniform in size. This is because if the size of the agglomerated material varies, the reduction reaction does not become homogeneous and the quality of the reduced iron becomes very low. In FIG. 1 of Patent Document 1, the pellets are classified by a pellet sieving apparatus to maintain uniformity as required in a reduction furnace. However, the pellet sieving device not only deteriorates the pellet supply efficiency, but also has a cost demerit of the pellet sieving device itself.

  In the method of Patent Document 2, briquettes are molded. Briquettes are more uniform than pellets and can form large agglomerates. However, since a briquette compresses a raw material by compression, it usually requires a binder as described above. In the method of Patent Document 2, water is impregnated immediately before forming a briquette in order to reduce the amount of binder used as much as possible. However, it is practically difficult to uniformly impregnate water throughout the aggregate of pellets. If even a part where moisture does not adhere remains, the surface of the mixed granulated body cannot be softened at that part, so the strength of the entire briquette does not increase. In addition, after briquetting, the moisture drying time also becomes longer.

  The reason why the pellets are collected and further briquetted in Patent Document 2 is that they are easy to handle because they are somewhat larger than when granulated into small bean charcoal (paragraph [0007]), and the strength of the briquette It is not for making it higher than pellet strength.

  An object of the present invention is to produce a briquette that can increase the strength even if the amount of binder used is reduced as much as possible.

  The briquette production method of the present invention that can achieve the above object includes a step of pulverizing an iron oxide raw material and / or a carbonaceous material, a step of forming a primary granular material using the iron oxide raw material and a carbonaceous material, Furthermore, it includes a step of forming a secondary granular material by pressurizing a plurality of primary granular materials.

  In the briquette manufacturing method, the primary granular material is preferably formed by rolling granulation, kneading granulation, or pressure molding.

  In the briquette manufacturing method, it is recommended to further include a step of preparing a mixed raw material by mixing an iron oxide raw material and a carbonaceous material between the pulverization step and the primary granular material forming step.

  In the briquette manufacturing method, the iron oxide raw material preferably contains steelmaking dust.

  In the briquette manufacturing method, the iron oxide raw material contains any one or more metals selected from zinc, lead, sodium, and potassium, and the secondary granular material is molded in a state including the metal. It is preferable.

  In the briquette manufacturing method, the iron oxide raw material is 10% by mass in total of at least one of oxides, chlorides, and sulfides of one or more metals selected from zinc, lead, sodium, and potassium. It is preferable to contain above.

  In the briquette manufacturing method, the iron oxide raw material contains an oxide of a metal having a melting point of 1500 ° C. or less (hereinafter referred to as “volatile metal”), and in a state of containing the oxide of the volatile metal. It is preferable to mold the secondary granular material.

  In the manufacturing method of the said briquette, it is preferable to make a primary granular material contain a water | moisture content.

  In the manufacturing method of the briquette, the primary granule is dried before being formed into the secondary granule, so that the moisture content of the primary granule is 50 to 95% by mass (hereinafter simply referred to as “%”) with respect to that before drying. It is preferable that

  It is preferable to further add a step of drying the secondary granular material to the briquette manufacturing method.

  In the briquette manufacturing method, the volume of the primary granular material is preferably set to 1/500 or more of the inner volume of the mold for molding the secondary granular material.

  Reduced iron can be produced by reducing the briquette obtained by the briquette production method.

  In the method for producing reduced iron, the reduction step is preferably performed using a rotary hearth furnace, a kiln furnace, or an electric heating reduction melting furnace.

  Zinc can be separated by adding a step of volatilizing zinc by heating and reducing a briquette obtained by the above briquette manufacturing method and containing zinc oxide.

  In the zinc separation method, it is preferable that the heating and reduction step be performed using a rotary hearth furnace, a kiln furnace, or an electric heating reduction melting furnace.

  Lead can be separated by adding a step of volatilizing lead by heating or heating and reducing briquettes obtained by the above briquette manufacturing method.

  In the lead separation method, it is preferable that the heating, heating, or reducing step is performed using a rotary hearth furnace, a kiln furnace, or an electric heating reduction melting furnace.

  In the present invention, by using an iron oxide raw material such as iron ore and steelmaking dust and / or a raw material obtained by pulverizing a carbonaceous substance, and by performing granulation in two stages, an intermolecular force acting between particles is used. The bonding strength between the particles becomes high, it is not necessary to use a binder such as molasses or water before molding the briquette, high-strength briquettes can be efficiently manufactured without particularly complicating the equipment, and As described later, the briquette can be continuously manufactured.

1. Outline Description (1) Grinding of Iron Oxide Raw Material In order to improve the strength of agglomerates containing iron oxide as raw materials, such as iron ore and steel making dust, the present inventors have so far made iron ore, steel making dust, carbonaceous matter. The selection and blending amount of binders such as substances and molasses, the blending amount of moisture, the timing of blending moisture, the dryness of the agglomerated product, etc., have been studied from various angles. As a result, when the iron oxide raw material or the coarse carbonaceous material (preferably both) is pulverized by a pulverizer such as a ball mill or a roll crusher, the smaller the particle, the smaller the mass per particle, so that the particles adhere to each other. As a result, it was found that the strength of the final agglomerated material was greatly improved by passing through the two-stage granulation process of the primary granular material and the secondary granular material, and the present invention was completed.

(2) Inclusion of zinc oxide and the like Further, the present inventors presuppose that the raw materials are pulverized as described above, and then add substances used as pigments such as paints such as zinc oxide and lead oxide. By adding it to the iron oxide raw material powder containing steelmaking dust, which is the raw material of briquette, these work as a binder for the iron oxide raw material, and the briquette molded without having to mix the binder and moisture. The knowledge that the strength is improved was obtained.

  Moreover, as a granulator which manufactures a pellet, a bread-type pelletizer or a drum-type pelletizer is normally used. Whichever granulator is used, the pellets obtained have a relatively wide particle size distribution due to the granulation principle. When pellets are formed by a bread granulator as described in Patent Document 1, it is usually necessary to provide an apparatus for classifying the formed pellets into a plurality of predetermined particle size ranges. It was. However, as a result of intensive studies by the present inventors, if the pellets are further pressed to form briquettes, small pellet grains enter the gaps between the large pellet grains, and the variation in pellet diameter is rather Ascertaining that it contributes to an increase in density, the present invention has been completed.

2. More Detailed Description (1) Grinding of Iron Oxide Raw Material The briquette manufacturing method of the present invention includes a step of pulverizing an iron oxide raw material such as iron ore and steelmaking dust, or a carbonaceous substance with a pulverizer, The method includes forming a primary granular material using an iron oxide raw material and a carbonaceous material, and further forming a secondary granular material by pressurizing a plurality of primary granular materials. The pulverization by the pulverizer will be described. In the following description, a case where a steelmaking dust raw material as an example of an iron oxide raw material is used will be representatively described. The production of the primary granular material and the secondary granular material will be described later.

  Any pulverizer may be used for pulverizing the steelmaking dust and / or carbonaceous material as long as it has a function of finely pulverizing the raw material particles. For example, a pulverizer such as a ball mill, a roll crusher, a hammer mill, or a tube mill may be used. Can be used. The object to be pulverized by the pulverizer may be either steelmaking dust or carbonaceous material.

  It has been generally known that the strength of the agglomerate is improved by making the raw material particles finer. However, when the raw material particles are fine, the amount of gas entering the raw material increases, so the bulk density of the raw material tends to be low. A decrease in the bulk density of the raw material leads to a decrease in the apparent density of the molded product, and consequently the strength of the molded product. In order to prevent this, conventionally, an ultrahigh pressure machine using a cold isostatic pressing method has to be used. The ultra-high pressure machine using the cold isotropic pressurization method is a so-called batch type production facility, so it does not support continuous operation, and production efficiency has reached its peak, making it unsuitable for mass production. In the present invention, raw materials such as steelmaking dust pulverized by a pulverizer are granulated in two stages, thereby realizing a speedup by continuous operation.

  In addition, as another cause (the cause other than the improvement of intermolecular force) that the strength of the agglomerate is improved by using the pulverized raw material, the pulverized fine particles are not spherical but have a shape with many irregularities. There is also an anchor effect (entanglement effect), and it is considered that the binding between the particles becomes strong by blending a small amount of moisture or binder.

(2) Inclusion of zinc oxide and the like On the premise that the raw material is pulverized as described above, the manufacturing method of the briquette of the present invention which is further improved includes (2-1) zinc oxide, lead oxide and the like. A step of forming a primary granular material using a powdery raw material containing a volatile metal; and (2-2) secondary granularity by pressurizing a plurality of primary granular materials while containing the volatile metal. And a step of forming into a product.

  Examples of the method for forming the primary granular material include a method by rolling granulation, a method by kneading granulation, or a method by pressure molding. Here, the primary granular material formed by rolling granulation is referred to as “pellet”. The pressure-molded secondary granular material is sometimes called “briquette”. Hereinafter, embodiments of the present invention will be described with a focus on the description of (2-1) pellet forming step and (2-2) briquette molding step. FIG. 1 is a process diagram according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating an example of equipment for performing this process.

(Granulation process)
As shown in FIG. 1, (a) steelmaking dust, (b) carbonaceous materials, and (c) oxides containing volatile metals (eg, zinc, lead, sodium, potassium, etc.) as necessary, or the like (2-1) Pellets are formed from mixed raw materials obtained by blending (d) a binder and (e) moisture, respectively. Next, after further adding (f) moisture as necessary, a briquette is molded by pressure compression (2-2) while containing volatile metal. Furthermore, the briquette is dried as required (2-3). Thereafter, (2-4) reduced iron can be obtained by supplying the obtained briquette to the reduction furnace, and (2-5) when the supplied briquette contains zinc and / or lead, the reduction furnace Zinc and / or lead can be recovered from the briquette by heat reduction at.

(A) Steelmaking dust Steelmaking dust contains iron oxide, so reduced iron can be produced by reducing the iron oxide briquette in a reduction furnace. As the steelmaking dust, various sources and forms such as dust that volatilizes once from a blast furnace, a molten steel furnace, an electric furnace, etc., and solidifies in gas can be used.

(A) Carbonaceous material When reducing the iron oxide by supplying the molded briquette to a mobile reduction furnace, for example, a rotary hearth furnace, a reducing agent necessary for the reduction reaction is mixed in the pellet formation stage. As the reducing agent, for example, carbon-containing substances such as coal, lignite, anthracite, coke powder, steelmaking dust including carbonaceous material, plastic, and wood powder can be used. From the viewpoint of maintaining the strength of briquettes, it is generally preferred to use a reducing agent with a low volatile content. However, according to the briquette manufacturing method of the present invention, the strength of briquettes is increased. Can be used.

  In addition to the reducing agent, the method of the present invention is also effective when a preconditioner (such as lime or dolomite) necessary for the melting furnace is premixed.

(C) Volatile metals (such as zinc oxide)
In order to improve the strength of the briquette, the present invention grinds the steelmaking dust and / or the carbonaceous material as described above. In order to further improve the strength of the briquette, the melting point of the mixed raw material is 1500. You may contain the volatile metal which is below degrees Centigrade. By containing volatile metals such as zinc oxide and lead oxide, which are also used in pigments such as paint, in the raw material, these work as binders for steelmaking dust and the like, even without mixing binders and moisture The strength of the molded briquette is improved. If the strength of briquettes is improved, various effects are brought about. For example, when briquettes are reduced, since the briquettes are not easily pulverized even in the reduction step, the reduction rate of iron oxide (reduction rate of reduced iron) is improved. Moreover, when recovering volatile metals such as zinc and lead contained in briquettes, the recovery rate and purity are also improved. Furthermore, since mixing and degassing of materials are promoted during granulation of pellets, an expensive mixer having a kneading function is not required for pelletizing the mixed raw materials.

  For the above reasons, in the present invention, it is preferable to contain a volatile metal in the mixed material. Although the amount varies depending on the type of the dust source, the steelmaking dust usually contains a metal such as zinc oxide derived from galvanized steel.

  Further, if the total content of volatile metals is appropriately adjusted, a more reliable bonding action is exhibited. Although it is a specific adjustment method, the concentration of zinc oxide contained varies depending on the type of dust source as described above. Therefore, by mixing an appropriate amount of steelmaking dust with different dust sources, volatility of zinc oxide, lead oxide, etc. It is possible to adjust the total content of metals. The total content of volatile metals is, for example, 10% by mass or more, more preferably 15% by mass or more, and further preferably 20% by mass or more. On the other hand, although there is no restriction | limiting in particular in the total content of a volatile metal, when considering the range which can be used industrially, it is 60 mass% or less, for example, More preferably, it is 50 mass% or less.

(D) Binder In order to improve the strength of the pellet, an appropriate amount of a binder such as starch or molasses may be mixed if necessary.

(E) Moisture (before pelletization, during pelletization process)
In order to improve the strength of the pellet, an appropriate amount of water may be mixed as necessary. Before pelletization, at a stage in the pelletization process, water can be mixed uniformly relatively easily. There is also an effect of reducing the amount of binder used.

(F) Moisture (before briquetting)
In the present invention, since raw material particles such as steelmaking dust are pulverized, the intermolecular force between the particles is strengthened, so that it is basically unnecessary to add moisture before briquetting. However, it is of course one of the embodiments that can be practiced to add moisture in an auxiliary manner depending on the amount and type of carbonaceous material used in combination.

  Although drying of briquettes is not an essential requirement of the present invention, the strength of briquettes can be further increased by drying. High strength can prevent powdering due to collapse after the briquette molding process, and it can also suppress surface tackiness by drying, so a large amount of intermediate briquettes can be stored in storage such as bottles and piles. Can be stored. The drying method may be any method such as heat drying, ventilation drying, and natural drying. However, when carbon is contained in the briquette, it is important to set the temperature so that the carbon does not ignite spontaneously.

  As mentioned above, although the manufacturing method of the briquette of this invention was demonstrated, it is desirable to dry a pellet before shaping | molding into a briquette. This is because, if the surface of the pellet is dry, it is difficult to adhere to the inside of the apparatus when the pellet is supplied to the briquette manufacturing apparatus. As a drying method, forced drying or natural drying (for example, 4 hours, preferably 1 day or more) can be considered. Even if the surface of the pellet is dried, the moisture present inside the pellet is dispersed throughout the briquette, which contributes to the improvement of the briquette strength. As the degree of drying, it is desirable that the moisture content of the pellets is 50 to 95% of that before drying. The reason why it is 95% or less is to effectively obtain the effect of preventing adhesion to the briquette manufacturing apparatus, and it is more preferably 90% or less. On the other hand, 50% or more is for maintaining the briquette strength to some extent, and more preferably 60% or more. The pellet-containing water content used as an index representing the degree of drying does not measure a part such as the surface or inside of the pellet, but measures the water content of the whole pellet.

(Equipment example)
Next, an example of equipment according to the embodiment of the present invention will be described with reference to FIG. The following facilities are merely examples, and the briquette manufacturing method of the present invention is not limited by the functions of the following facilities.

  As shown in FIG. 2, steel storage dust, a carbonaceous material as a reducing agent, and a binder are stored in each of the three storages 1. Each material discharged from the storage 1 is mixed by the mixer 2 and then supplied to the bread granulator 3 which is a rolling granulator. Here, the steelmaking dust and / or carbonaceous material used is pulverized by a pulverizer such as a ball mill or a roll crusher. The arrangement of the pulverizer may be before the raw material is stored in the storage 1 or after being discharged from the storage 1 and before being supplied to the mixer 2.

  As described in Patent Document 1, for example, the bread granulator 3 is a rotating pan having a diameter of 2 to 6 m in the shape of a wok. The pan is tilted at about 45 degrees, and the steel-making dust and reducing agent containing water roll in this, and pellets grow while new powder material is sprinkled around the generated core. . Fully grown pellets come out of the bread under their own weight.

  The pelletized material is inserted into the briquetting device 4. In the briquetting apparatus 4, the pellet material is solidified (briquette) by being pressed and compressed by two rollers having concave portions, and sequentially discharged as briquettes.

  In addition, it is preferable that the volume of primary granular materials, such as a pellet, is 1/500 or more of the internal volume of the type | mold (usually called a "pocket") for shape | molding a briquette. If it is less than 1/500, the contact area between the briquette and the inner wall of the pocket is too large, and adhesion to the inner wall of the pocket increases. The upper limit of the briquette volume is not particularly limited, but is practically less than the inner volume of the pocket.

The pellet inserted into the briquetting apparatus 4 has the following two characteristics.
(I) In a state containing volatile metals such as zinc oxide and lead oxide The pellets are inserted into the briquetting apparatus 4 while containing volatile metals such as zinc oxide and lead oxide. Therefore, the strength of the briquette generated by the binding action of the volatile metal is further improved. Thereby, it is possible to reduce the usage-amount of a binder. Reduction of the amount of binder used leads to prevention of material adhesion to the inner wall of the facility such as an intermediate hopper. Further, when a reducing agent such as a carbonaceous material is blended with a metal oxide containing steelmaking dust, the strength of the briquette is likely to decrease, so that the strength of the present invention can be improved by the inclusion effect of zinc oxide or the like. The method is particularly useful.

(Ii) As granulated pellets As a preferred embodiment of the present invention, the granulated pellets can be inserted into the briquette apparatus 4 without being classified according to the size thereof. Recommended. As described above, since there are considerable variations in the particle size of the pellets, the particle size is usually made uniform using a pellet sieving apparatus. In the aggregate of pellets having a large variation in particle size in the present embodiment, small pellets enter the gaps between the large pellets, and the bulk density is large and the voids are small. By pressure-compressing (aggregating) such an aggregate of pellets, a briquette having a high bulk density and high strength can be obtained. Further, there is no need to install a pellet sieving apparatus as described above, and there is no need to provide equipment for recycling pellets that are no longer necessary for classification.

  The briquette molded as described above is evaporated into the rotary hearth furnace 6 after the moisture is evaporated by the dryer 5, and reduced iron (metal) by the action of the reducing agent (carbon) by being heated on the hearth. Iron) is produced. The rotary hearth furnace 6 is heated by a burner 7. After being reduced by heating in the rotary hearth furnace 6, the vaporized zinc or lead is recovered by a dust recovery device 8 (for example, equipped with a bag filter) and recycled as a zinc raw material or a lead raw material. The remaining gas is exhausted by the exhaust fan 9. A heat exchanger 10 is provided in the middle of the exhaust path, and is effectively used as a heat source for hot air supplied to the dryer 5 and the burner 7.

It is a process figure concerning an embodiment of the invention. It is a figure which shows the example of an installation for implementing the process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage 2 Mixer 3 Bread granulator 4 Briquette apparatus 5 Dryer 6 Rotary hearth furnace 7 Burner 8 Dust collection apparatus 9 Exhaust fan 10 Heat exchanger

Claims (15)

  The step of pulverizing the iron oxide raw material and / or the carbonaceous material, the step of forming the primary granular material using the iron oxide raw material and the carbonaceous material, and further pressurizing the plurality of primary granular materials into the secondary granular material A method for producing briquettes including a molding step.   The method for producing briquettes according to claim 1, wherein the primary granular material is formed by rolling granulation, kneading granulation, or pressure molding.   The briquette according to claim 1 or 2, further comprising a step of preparing a mixed raw material by mixing the iron oxide raw material and the carbonaceous material between the pulverizing step and the forming step of the primary particulate matter. Production method.   The manufacturing method of the briquette in any one of Claims 1-3 in which the said iron oxide raw material contains steelmaking dust.   The said iron oxide raw material contains any 1 or more types of the metal selected from zinc, lead, sodium, potassium, and shape | molds the said secondary granular material in the state containing this metal. The manufacturing method of the briquette in any one.   The said iron oxide raw material contains 10 mass% or more in total in any 1 or more types of the oxide, chloride, or sulfide of 1 or more types of metals selected from zinc, lead, sodium, and potassium. The manufacturing method of briquette as described in 2.   The iron oxide raw material contains an oxide of a metal having a melting point of 1500 ° C. or less (hereinafter referred to as “volatile metal”), and includes the oxide of the volatile metal. The manufacturing method of the briquette in any one of Claims 1-4 which shape | mold.   The manufacturing method of the briquette in any one of Claims 1-7 which makes the said primary granular material contain a water | moisture content.   The briquette manufacturing method according to claim 8, wherein the primary granule is dried before being formed into the secondary granule, so that the water content of the primary granule is 50 to 95 mass% with respect to that before drying. Method.   The manufacturing method of the briquette of Claim 8 or 9 which has the process of drying the said secondary granular material.   The manufacturing method of the briquette in any one of Claims 1-10 whose volume of the said primary granular material is 1/500 or more of the internal volume of the type | mold for shape | molding the said secondary granular material.   The manufacturing method of reduced iron including the process of reduce | restoring the briquette manufactured by the method as described in any one of Claims 1-11.   The method for producing reduced iron according to claim 12, wherein the reduction step is performed using a rotary hearth furnace, a kiln furnace, or an electric heating reduction melting furnace.   A method for separating zinc, comprising a step of volatilizing zinc by heating and reducing a briquette produced by the method according to any one of claims 1 to 11 and containing zinc oxide.   A method for separating lead, comprising a step of volatilizing lead by heating or heating and reducing briquettes produced by the method according to any one of claims 1 to 11.