JP3500975B2 - Method for producing soluble potassium fertilizer - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention contains a potassium component which is insoluble in water but is soluble in citric acid (hereinafter, this potassium component is referred to as “ku-soluble potassium”) and exhibits a slow-acting effect. The present invention relates to a method for producing soluble potassium fertilizer.

[0002]

2. Description of the Related Art As a soluble potassium compound, [K ₂ O
.Al ₂ O ₃ .2SiO ₂ ], [K ₂ O. (Al, F
e) ₂ O ₃ .2SiO ₂ ], [K ₂ O.MgO.SiO
₂ ], [K ₂ O · CaO · SiO ₂ ] and the like are known, and many methods for producing a potassium soluble fertilizer by producing these potassium compounds have been proposed.

For example, JP-A-60-127286 discloses powders of silica stone, blast furnace slag, converter slag, nickel smelting slag, phosphorus smelting slag, andesite, and potassium raw materials such as potassium carbonate and caustic potassium. After mixing and, the mixture is heated and melted, and then cooled and pulverized to produce a fusible potassium fertilizer.

Further, JP-A-55-51785 discloses that
After adding potassium raw materials such as potassium carbonate and caustic potassium to fly ash collected by the dust collector of a coal-fired power plant, pulverized coal is added to granulate, and the added pulverized coal is used as a fuel to form a granulated product. A method for producing a black soluble fertilizer by firing is disclosed.

[0005]

In all of the above-mentioned prior arts, a melting step or a firing step is required when reacting the prepared raw materials, and therefore, there is a problem that an extremely large amount of heat is required. is there. In addition, in particular, in the method of producing a fusible potash fertilizer by firing a mixture of fly ash and a potassium raw material, a step of crushing the raw material, a step of granulating the raw material, and a drying of the granulated material are performed before the step. There is also a problem that the manufacturing process is very complicated because it is necessary to provide steps and the like.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and consumes less heat required to heat the raw material and simplifies the manufacturing process. It aims at providing the manufacturing method of.

[0007]

A method for producing a hot soluble potassium fertilizer according to the first aspect of the present invention is to maintain hot metal containing desiliconized hot metal and desiliconized slag generated during desiliconization of the hot metal. In the vessel, the potassium raw material is placed on top and added, a stirring gas is blown into the hot metal to stir, and the desiliconized slag and the potassium raw material are fused, and the slag produced by the fusion is cooled. And the step of solidifying.

A method for producing a hot-soluble potassium fertilizer according to a second aspect of the present invention is a method of producing a potash raw material in a hot metal holding container containing desiliconized hot metal and desiliconized slag generated during the desiliconization of the hot metal. And the step of adding a component adjusting agent together with the above, and a step of blowing a stirring gas into the hot metal and stirring the mixture to fuse the desiliconized slag, the potassium raw material and the component adjusting agent, And the step of cooling and solidifying the slag produced by fusion.

In the method for producing a fusible potassium fertilizer according to the third aspect of the present invention, during the desiliconization treatment of the hot metal using the stirring gas in the hot metal holding container, a potassium raw material is added and the desiliconization produced by the desiliconization treatment is performed. It comprises a step of stirring and fusing the slag and the potassium raw material with the stirring gas, and a step of cooling and solidifying the slag produced by the fusion.

According to the fourth aspect of the present invention, there is provided a method for producing a potassium soluble fertilizer, which comprises adding a potassium raw material and a component modifier during desiliconization of hot metal using a stirring gas in a hot metal holding container to remove silicon. The step of stirring the desiliconized slag generated by the above, the potassium raw material, and the component adjuster with the stirring gas to fuse them together, and the step of cooling and solidifying the slag produced by the fusion.

A fifth aspect of the present invention is the method for producing a potassium soluble fertilizer according to the second or fourth aspect, wherein the component modifier is a substance containing a Mg compound.

[0012] A method for producing a potassium soluble fertilizer according to a sixth aspect of the present invention is the method according to any one of the second aspect, the fourth aspect and the fifth aspect, in which a component modifier is blown into the hot metal by a carrier gas. It is characterized in that it is added.

The method for producing a fusible potash fertilizer according to the seventh aspect is characterized in that, in the third or fourth aspect , the potash raw material is placed on top and added.

The method for producing a potassium-soluble potassium fertilizer according to the eighth invention is any one of the first invention, the second invention and the seventh invention.
According to another aspect of the invention , the potash raw material is briquette.

A method for producing a black soluble potassium fertilizer according to a ninth aspect is characterized in that, in the third aspect or the fourth aspect , the potassium raw material is blown into the hot metal by a carrier gas and added.

[0016] The method for producing a fusible potassium fertilizer according to a tenth aspect of the invention is the method according to the third or fourth aspect of the invention, wherein the potassium raw material is blown into the desiliconized slag by a carrier gas or is projected onto the desiliconized slag. It is characterized in that it is added.

In the pig iron integrated iron-making method using a blast furnace and a converter, the hot metal tapped from the blast furnace is decarburized into a molten steel in the converter, but in recent years, as the required quality level of products has increased, Therefore, desulfurization treatment and dephosphorization treatment are carried out in the hot metal holding container at the stage of hot metal with high removal efficiency of sulfur and phosphorus. However, the hot metal tapped from the blast furnace contains silicon, and this silicon hinders the dephosphorization reaction.Therefore, in the hot metal gutter of the blast furnace cast bed, in the hot metal holding container, or both, an oxygen gas or solid oxygen source, etc. Desiliconization treatment is performed by adding the silicon removal agent.

SiO ₂ is produced by this desiliconization treatment.
Also, when tapping from the blast furnace, the blast furnace slag discharged at the same time as the hot metal from the blast furnace is separated from the hot metal by the skinma provided in the blast furnace casting floor, but some blast furnace slag is mixed in the hot metal. It flows into the hot metal holding container. Blast furnace slag is CaO-
It is a SiO ₂ —Al ₂ O ₃ —MgO system, and therefore, SiO ₂ produced by desiliconization treatment and blast furnace slag are fused, and slag produced by desiliconization treatment (hereinafter referred to as “desiliconized slag”). Is mainly composed of SiO ₂ , CaO,
The compound composition includes Al ₂ O ₃ , MgO and the like.

K-soluble potassium fertilizer is generally K₂O and Si
O₂In addition to Al₂O₃, Fe₂O ₃, MgO, CaO
Consist of a soluble potassium compound containing at least one of
Has been. Therefore, the desiliconized slag and the potassium raw material are
The agitating gas blows into the mixture to forcibly agitate and mix.
If so, the potassium raw material is heated, melted, decomposed, and desiliconized slag
Fused slag with a soluble potassium compound composition
Be done. That is, after the desiliconization treatment or during the desiliconization treatment, the potassium raw material is
When added and stirred, a soluble potassium fertilizer is produced. So
At the time of slag, sensible heat, latent heat, decomposition heat, and desiliconization slag
The heat of dissolution of the hot metal is due to the large amount of hot metal that coexists in the hot metal holding container.
It does not need to be heated because it is supplemented by the amount of heat stored.
Yes. Potassium carbonate, bicarbonate and
Potassium salts such as potassium chloride and potassium sulfate, and potassium salts such as potassium feldspar
Use minerals.

As described above, according to the present invention, since the high temperature desiliconization slag produced by the desiliconization treatment of hot metal is used as the main raw material of the hot-dissolving potash fertilizer, the amount of heat for heating the desiliconization slag is unnecessary, and Since the hot metal supplies the amount of heat required for melting, decomposing, and fusing the potassium raw material, the thermal economy is extremely high. In addition, since the heating time of desiliconization slag is unnecessary, it can be manufactured in a short time, and desiliconization slag, which has been difficult to use as a material, can be effectively used, and new manufacturing equipment is not required. , Can be manufactured with existing steelmaking equipment.

The composition of desiliconized slag changes by affecting the amount of blast furnace slag mixed. Therefore, for example, when the amount of blast furnace slag mixed is large and the SiO ₂ content is insufficient, SiO ₂ -containing substances such as silica sand are used, and when the amount of blast furnace slag mixed is small, Al ₂ O ₃ , Fe ₂ O ₃ , When MgO, CaO, etc. are insufficient, a substance containing a desired component such as bauxite, iron ore, magnesia clinker, quick lime, etc. is added as a component adjusting agent for the K-soluble potassium fertilizer to obtain a predetermined K-soluble potassium compound. can do. As described above, the component adjusting agents are SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , and Mg.
Any substance may be used as long as it is a substance containing at least one of O and CaO as main components. When the component adjusting agent contains attached water, it is preferable to use it after drying. At that time, if the component adjusting agent is blown into the hot metal by the carrier gas and added, the melting of the component adjusting agent is promoted, and the desired composition of the soluble potassium compound can be rapidly obtained.

Among these component modifiers, Mg is
It is an important element that makes up chlorophyll, so
Adding substances containing compounds as component modifiers
Is particularly effective as a potassium soluble fertilizer. Compound of Mg
The thing is Mg oxide, carbonate, chloride, etc.
As the substance containing the compound of
In addition to cars, dolomite (CaCO₃-MgCO₃) And
Serpentine (MgO-SiO ₂) Etc.

In general, since the potassium raw material has a low melting point and a high vapor pressure, if it touches the hot metal, it will evaporate before it fuses with the desiliconization slag, and the yield will decrease. Therefore, if the potassium raw material is overlaid and added on the desiliconized slag, the potassium raw material immediately fuses with the desiliconized slag and is stabilized as K ₂ O in the slag.
The evaporation amount is reduced and the yield is improved. However, since dust is generated when the powdery potassium raw material is placed on top, it is preferable to add the potassium raw material as a briquette in advance when placing it on top.

If the potash raw material is made into briquette,
The manufacturing process becomes complicated and the manufacturing cost rises. Therefore, when a powdery potassium raw material is added, it is preferable to add the potassium raw material by blowing it into the hot metal with a carrier gas in order to prevent dust from being generated. Alternatively, it is preferable that the powdery potassium raw material is blown into the desiliconized slag by a carrier gas or is sprayed onto the desiliconized slag to be added. Thus, by directly adding the potassium raw material to the desiliconized slag, the potassium raw material is immediately fused with the desiliconized slag and stabilized as K ₂ O in the slag, so that the yield of the potassium raw material is improved.

[0025]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of a hot metal desiliconization treatment facility according to the present invention.

In FIG. 1, a ladle type hot metal holding container 1 containing hot metal 2 tapped from a blast furnace (not shown) is mounted on a carriage 3 and conveyed to a desiliconization treatment facility. The hot metal holding container 1 is conveyed by a trolley 3 from the blast furnace to the hot metal processing equipment and a converter (not shown). Desiliconization processing equipment,
An upper blowing oxygen lance 6 and an injection lance 7 are installed. The top-blown oxygen lance 6 and the injection lance 7 are vertically movable in the hot metal holding container 1.

The injection lance 7 has three systems including a storage tank 10, a lift tank 13, a dispenser 16, a storage tank 11, a lift tank 14, a dispenser 16, and a storage tank 12, a lift tank 15, and a dispenser 16. The potassium raw material 5 connected to the raw material supply equipment and stored in the storage tank 10, the component adjusting agent 8 stored in the storage tank 11, and the storage tank 12
The slag-making agent 9 stored in the
By adjusting the position of the tip of, the nitrogen gas can be added as a carrier gas by blowing it from the injection lance 7 into the hot metal 2 or the desiliconized slag 4. Further, by arranging the tip of the injection lance 7 directly above the desiliconization slag 4, it is possible to add the potassium raw material 5, the component adjusting agent 8, and the slag forming agent 9 to the desiliconization slag 4 together with the nitrogen gas. it can. Note that the potash raw material 5 in the storage tank 10, the component adjusting agent 8 in the storage tank 11, and the slag-forming agent 9 in the storage tank 12 are independently added in the lift tanks 13, 14, and 15, respectively. It is possible to control the time and blow it, or it is also possible to blow only the nitrogen gas from the injection lance 7 and stir the hot metal 2. The slag forming agent 9 is used for adjusting the basicity during the desiliconization treatment, and quick lime is generally used.

Further, the raw material supply equipment including the hoppers 17, 18, 19 and the cutting devices 21, 22, 23, the raw material conveying device 24, and the chute 25 is used to adjust the potassium raw material 5 in the hopper 17 and the components in the hopper 18. The agent 8 and the iron ore sintered powder 20 in the hopper 19 can be placed on top of the hot metal holding container 1 and added.

Using the desiliconization treatment equipment having such a structure,
A method for producing a molten slag having a soluble potassium compound composition will be described below. First, a method of manufacturing by adding the potassium raw material 5 and the component adjusting agent 8 after the desiliconization treatment will be described below.

The hot metal 2 is desiliconized in the hot metal holding container 1, and the amount and composition of the blast furnace slag remaining in the hot metal holding container 1 is grasped before the desiliconizing process. The amount of residual slag is
It can be grasped by measuring the slag thickness or visually observing the area ratio of the residual slag covering the molten metal surface of the hot metal 2. The slag composition is analyzed and understood.

Then, a silicon removal treatment is performed. Desiliconization treatment is
For example, the iron ore sintered powder 20 is held by the chute 25 in the hot metal
Place it in the container 1 and add it at the same time.
Oxygen gas is sprayed onto the hot metal surface of the hot metal 2 from the
Injecting nitrogen gas from the injection lance 7
The iron ore sintered powder 20 is mixed by stirring. Then,
The oxygen gas and the oxygen in the iron ore sintered powder 20 are contained in the hot metal 2.
SiO reacts with silicon ₂To generate. Generated SiO₂
Mixes and fuses with the residual slag, thus leaving S on the hot metal 2.
iO₂The desiliconized slag 4 containing as a main component is generated.

The desiliconization treatment is not limited to the above method, but quick lime or the like may be blown as the slag forming agent 9 by the injection lance 7, and instead of the iron ore sintered powder 20. It can also be carried out using iron oxide such as mill scale.

After the silicon removal treatment, the amount of SiO ₂ produced by the silicon removal treatment is grasped. The amount of SiO ₂ generated can be grasped from the silicon concentration of the hot metal 2 before and after the desiliconization treatment. It can also be grasped from the total oxygen addition amount of oxygen gas and oxygen of the iron ore sintered powder 20. Then, the rough composition and the rough weight of the desiliconized slag 4 are grasped by the production amount of SiO ₂ and the amount and composition of the residual slag grasped before the desiliconizing treatment. From the grasped approximate weight and composition of the desiliconized slag 4, the addition amount of the potassium raw material 5 and, if necessary, the addition amount of the component adjusting agent 8 are determined. If the weight of the desiliconized slag 4 is grasped from the measurement of the slag thickness and the like, and an analysis sample is taken from the desiliconized slag 4 and the components are analyzed, the accurate weight and composition can be grasped.

Then, a predetermined amount of potassium raw material 5 and, if necessary, a predetermined amount of component adjusting agent 8 are added to the hot metal holding container 1 to start the production of the black soluble potassium fertilizer. In addition, potassium raw material 5
It is desirable to blow nitrogen gas into the hot metal 2 from the injection lance 7 before adding. By blowing nitrogen gas, the hot metal 2 and the desiliconized slag 4 are agitated, the desiliconized slag 4 is melted, the composition of the desiliconized slag 4 is made uniform, and the subsequent production of the fusible potash fertilizer is facilitated. Because it will be.

It is preferable that the potassium raw material 5 is placed on the hot metal holding container 1 from the chute 25 in order to improve the yield of the potassium raw material 5. At this time, if the potash raw material 5 is briquette in advance, the generation of dust is prevented. In addition, when the powdery potassium raw material 5 is added, a carrier gas is used,
It is preferable to add by blowing it from the injection lance 7 into the hot metal 2 or the desiliconized slag 4, or by spraying on the desiliconized slag 4. FIG. 1 shows a state in which the potassium raw material 5 is overlaid and added.

The component adjusting agent 8 is preferably added by being blown into the hot metal 2 from the injection lance 7 in order to accelerate the melting of the component adjusting agent 8 and quickly obtain a desired slag composition. Although the order of adding the potassium raw material 5 and the component adjusting agent 8 is arbitrary, it is preferable that a predetermined amount of the component adjusting agent 8 be added before the addition of the potassium raw material 5 and then the addition of the potassium raw material 5 be started. Since the desiliconization slag 4 is adjusted to a predetermined component, the fusion of the potassium raw material 5 and the silicon removal slag 4 is promoted, and the period during which the potassium raw material 5 is kept at a high temperature is reduced to reduce the potassium raw material 5 This is because the evaporation amount of K in the inside is reduced and the yield of the potassium raw material 5 is improved.

After the addition of the potassium raw material 5 and the component adjusting agent 8 is completed, nitrogen gas is further blown into the hot metal 2 from the injection lance 7 to mix the desiliconized slag 4 with the potassium raw material 5 and the component adjusting agent 8 together with the hot metal 2. It is preferable to promote the fusion of the desiliconized slag 4 with the potassium raw material 5 and the component adjusting agent 8 and to homogenize the composition of the molten slag produced.

In this way, the potassium raw material 5 and the component adjusting agent 8 added after the desiliconization process are fused with the desiliconized slag 4 to produce the molten slag having the composition of the fusible potassium compound on the hot metal 2.

Next, a method for producing the molten slag having the composition of the soluble potassium compound by adding the potassium raw material 5 and the component adjusting agent 8 during the desiliconization treatment will be described below.

Before the desiliconization treatment, the amount and composition of the residual blast furnace slag are grasped according to the above method. Then, the silicon removal treatment is performed according to the above method, and the potassium raw material 5 and the component adjusting agent 8 are added from the injection lance 7 or the chute 25 during the silicon removal treatment. In this case, the addition amounts of the potassium raw material 5 and the component adjusting agent 8 are determined as follows. First, the amount and composition of residual slag before desiliconization treatment and the amount of SiO ₂ produced estimated from the difference between the silicon concentration before desiliconization treatment and the target silicon concentration after desiliconization treatment The outline composition and outline weight of the generated desiliconization slag 4 are grasped, and from the grasped outline weight and outline composition of the desiliconized slag 4, the addition amount of the potassium raw material 5 and, if necessary, the component adjuster 8 And the amount to be added are determined. The production amount of SiO ₂ can be estimated also from the oxygen gas used in the desiliconization treatment and the total oxygen addition amount of oxygen of the iron ore sintered powder 20.

Also in this case, it is preferable to add the potassium raw material 5 on the top and to make it into a briquette, and to add the component adjusting agent 8 by blowing it through the injection lance 7 for the above reason.
Further, when the powdery potassium raw material 5 is added, the carrier gas is used to blow it from the injection lance 7 into the hot metal 2 or the desiliconizing slag 4 or to add it to the desiliconizing slag 4. It is preferable to add it. However, in the case of adding in the silica removal slag 4 or by spraying to the silica removal slag 4, after the addition of a predetermined amount of the potassium raw material 5 is completed, the injection lance 7 is lowered into the hot metal 2 to stir the hot metal 2. It will be decided.

Then, the silicon removal treatment is carried out for a predetermined time, and the work is completed. In this way, the potassium raw material 5 and the component adjuster 8 added during the desiliconization process are fused with the desiliconized slag 4 to produce molten slag having the composition of the fusible potassium compound on the hot metal 2.

Next, the molten slag having the composition of the fusible potassium compound produced by fusing as described above is held in the hot metal holding container 1
Remove from the pan and cool to solidify. The cooling and solidification may be performed either when the hot metal holding container 1 is taken out, or when the hot metal holding container 1 is put in another container and then taken out of the container.

The cooling and solidifying method is a method in which high-pressure air is blown and scattered to the generated molten slag to cool and granulate (also referred to as "blasting method"), or high-pressure water is blown and scattered to cool. There is a method of granulating with it (referred to as "water granulation method"), or a method of flowing out the molten slag generated on the thick steel plate and cooling by forced cooling by the thick steel plate and heat dissipation to the air, any method is possible, Water soluble potassium in water soluble potassium fertilizer is also important as a fertilizer and the water granulation method may reduce the amount of water soluble potassium. Therefore, the amount of water is optimized and cooling water is evaporated to minimize the amount of residual cooling water. The method is preferred. If the shape after cooling and solidification is lumpy, it is crushed and sized to a predetermined size to obtain a soluble potassium fertilizer. The hot metal 2 is sent to the next processing step.

In this way, it is possible to manufacture the fusible potassium fertilizer with extremely high thermo-economy and in a short time by using the existing iron making equipment, and as a result, it is possible to greatly reduce the manufacturing cost.

The above description is for the case where the desiliconization treatment is carried out in the hot metal holding vessel 1. However, the desiliconization treatment is not limited to the above method, and the blast furnace slag is tapped from the blast furnace and the skinma is used. Even if desiliconization treatment is carried out by adding solid oxygen source such as oxygen gas or iron ore sintered powder 20 to the hot metal in the blast furnace casting trough or the tilting trough after separation from The present invention can be carried out without any trouble along the method of adding the potassium raw material 5 after the silicidation. However, in this case,
It is necessary to directly grasp the weight and composition of the desiliconized slag 4 that has flowed into the hot metal holding container 1 to determine the addition amounts of the potassium raw material 5 and the component modifier 8.

Further, although the above description has explained the ladle-type hot metal holding container 1, the hot metal holding container 1 is not limited to the above-mentioned ladle type, and may be a torpedo car or before the desiliconization treatment. Even if the desulfurization treatment is performed in advance, the present invention can be carried out according to the above without any trouble. Further, the desiliconization treatment equipment and the soluble potassium production equipment may be separated, and a plurality of storage tanks or hoppers for storing the component adjusting agent 8 may be installed respectively. Needless to say, it is not limited to the above.

[0048]

【Example】

[Example 1] The present invention was carried out in the desiliconization treatment facility shown in FIG. The hot metal tapped from the blast furnace was transferred to a desiliconization treatment facility. Hot metal weight is 150 tons, hot metal composition is carbon; 4.6
8 wt%, silicon; 0.24 wt%, phosphorus; 0.103 wt
%, Sulfur; 0.042 wt%, and the hot metal temperature was 1395 ° C. In the hot metal holding container, the blast furnace slag (C
aO = 44 wt%, SiO ₂ = 35 wt%, MgO = 6
wt%, Al ₂ O ₃ = 13 wt%) remained, and the amount of residual slag was 400 kg by visual observation.

First, desiliconization treatment was performed. Desiliconization treatment is
Oxygen gas flow rate from top blowing oxygen lance is 800-900
It is continuously sprayed as Nm ³ / hr on the surface of the hot metal, and the iron ore sinter powder addition rate is continuously overlaid at 200-240 kg / min. Further, quick lime as a slag forming agent is 40-
It was continuously blown into the hot metal with an injection lance together with nitrogen gas at an addition rate of 50 kg / min, and the desiliconization treatment was completed in 5 minutes. The total amount of added oxygen gas is 74N
m ³ , the total amount of iron ore sintered powder was 1100 kg, the total amount of quick lime was 220 kg, and the hot metal temperature after desiliconization treatment was 1337 ° C.

The silicon concentration in the hot metal after desiliconization is 0.12 w
t%, SiO by desiliconization treatment ₂Desiliconization
From the silicon concentration in the hot metal before and after the treatment, it was estimated to be 385 kg.
It was Also, the amount of residual slag before desiliconization; 400 kg
The amount of quicklime added during the silicidation process: 220 kg and the generated S
iO₂Amount: 385 kg, basicity (CaO / SiO
₂, C / S) was estimated to be 0.75. This base
Due to the degree, it was not necessary to add a component adjusting agent. Charcoal raw material is charcoal
With potassium acid, K₂Set the O concentration target to 20 wt%
Calculating the amount of potassium carbonate added with the residue being 90%, it was 409
It was determined to be kg.

Next, a K-soluble potassium fertilizer was produced. First, nitrogen gas was blown into the hot metal from the injection lance for 2 minutes before the addition of potassium carbonate, and the hot metal and the desiliconized slag were stirred and melted. Next, the nitrogen gas blowing was stopped, and potassium carbonate preformed in a briquette of about 30 mm diameter was placed on top at an addition rate of 80 to 120 kg / min, and 409 kg was added by continuous addition for 5 minutes. After the addition of potassium carbonate, nitrogen gas was blown into the hot metal through the injection lance for 2 minutes to promote fusion of the desiliconized slag and potassium carbonate to obtain molten slag.

Then, the generated molten slag was once scraped from the hot metal holding container into a cast steel ladle (hereinafter referred to as "NOROPAN") using a slag scraper. Next, the molten slag was poured into an iron box having a bottom surface and a side surface constructed of a thick steel plate having a thickness of 15 to 20 mm provided in the building, cooled and solidified to obtain 1258 kg of massive slag. This massive slag was crushed to a size of 2 mm or less to obtain a potassium soluble fertilizer. Table 1 shows the components of this soluble potassium fertilizer and the yield of potassium carbonate.
Table 2 shows the analytical values of the water-soluble potassium and the water-soluble potassium. In Table 2, T. K ₂ O is the total potassium, C-K ₂ O is click-soluble potassium, W-K ₂ O is shown a water-soluble potassium. The Ku-soluble potassium is K ₂ O content dissolved in 2 wt% citric acid, and the Ku-soluble potassium contains water-soluble potassium. As shown in these tables, the K ₂ O content in the produced K-soluble potassium fertilizer was 20.4.
In wt%, 97% of them were soluble in Cu. The yield of potassium carbonate was 92%. In Table 2, T. Mg
O and C-MgO are also shown at the same time. T. MgO is for all hard soil,
C-MgO is a refractory solute and its definition is the same as that of potassium. In the present embodiment, the soluble magnesium content is 1.
It was 5 wt%. Magnesium is another name for MgO.

[0053]

[Table 1]

[0054]

[Table 2]

[Example 2] Similar to Example 1, the present invention was carried out in the desiliconization treatment facility shown in FIG. The hot metal tapped from the blast furnace was transferred to a desiliconization treatment facility. The weight of hot metal is 150
Ton, hot metal composition is carbon; 4.49 wt%, silicon;
23 wt%, phosphorus; 0.097 wt%, sulfur; 0.038
The wt% and the hot metal temperature were 1406 ° C. In the hot metal holding container, blast furnace slag (CaO = 42 wt%, S
iO ₂ = 33 wt%, MgO = 7 wt%, Al ₂ O ₃ =
15 wt%) remains, and the amount of residual slag is 48 by visual observation.
It was 0 kg.

First, desiliconization treatment was performed. Desiliconization treatment is
Oxygen gas flow rate from top blowing oxygen lance is 800-900
It is continuously sprayed as Nm ³ / hr onto the surface of the hot metal, and the iron ore sintered powder addition rate is continuously set at 200 to 240 kg / min, and nitrogen gas is continuously added into the hot metal by an injection lance. Blowing, and then firing dolomite powder as a component adjusting agent was blown into the hot metal with an injection lance together with nitrogen gas at an addition rate of 30 to 40 kg / min to complete the desiliconization treatment in 5 minutes. The total amount of added oxygen gas was 70 Nm ³ , and the total amount of iron ore sintered powder was 10.
50 kg, the total amount of calcined dolomite was 115 kg, and the hot metal temperature after desiliconization treatment was 1390 ° C. Incidentally, in 115 kg of calcined dolomite, the MgO content was 48 kg and the CaO content was 67 kg.

The silicon concentration in the hot metal after desiliconization is 0.12 w
t%, SiO by desiliconization treatment ₂Desiliconization
From the silicon concentration in the hot metal before and after the treatment, it was estimated to be 354 kg.
It was Also, the amount of residual slag before desiliconization; 480 kg,
SiO made₂Amount: 354kg, with added fired doloma
It is estimated that the basicity is 0.52 from 115 kg of salt
In order to adjust the basicity to 0.7, quicklime 9 is used as a component adjusting agent.
It was decided to add 4 kg. Also, as a raw material for potassium carbonate
BR> use, K₂Set the O concentration target to 20 wt%
The amount of potassium carbonate added was calculated to be 427 with the residue being 90%.
It was determined to be kg.

Next, a black soluble potassium fertilizer was produced. First, before the addition of potassium carbonate, quick lime as a component adjusting agent was added to the mixture with nitrogen gas from an injection lance at 30 to 5%.
Blow into hot metal at 0 kg / min for 3 minutes 94 kg
Was completed. Then, the injection lance
The tip is pulled up to the position of the desiliconized slag, and powdered potassium carbonate is blown into the desiliconized slag at an addition rate of 70 to 90 kg / min together with nitrogen gas from this injection lance, and continuously added for 6 minutes. 427k in addition
The addition of g was completed. After the addition of potassium carbonate was completed, the injection lance was lowered into the hot metal and nitrogen gas was added into the hot metal.
It was blown for a minute to promote the fusion of desiliconized slag and potassium carbonate to obtain molten slag.

Then, the generated molten slag was scraped from the hot metal holding container into a Noropan with a slag scraper, and then cooled and solidified by an air crushing method to obtain 1255 kg of granular slag having a diameter of about 5 mm, and the slag was dissolved. It was potash fertilizer.
The components of this black soluble potassium fertilizer, the yield of potassium carbonate, and the analytical values of the black soluble potassium and the water soluble potassium are shown in Tables 1 and 2 above. As shown in these tables, K ₂ in the black soluble potassium fertilizer is shown. The O content was 21.5 wt%, 91% of which was soluble in Cu, and the yield of potassium carbonate was 93%. The soluble magnesia content was 5.2 wt%.

[Example 3] Similar to Example 1, the present invention was carried out in the desiliconization treatment facility shown in FIG. The hot metal tapped from the blast furnace was transferred to a desiliconization treatment facility. The weight of hot metal is 150
Ton, hot metal composition is carbon; 4.53 wt%, silicon;
24 wt%, phosphorus; 0.099 wt%, sulfur; 0.040
The wt% and the hot metal temperature were 1404 ° C. In the hot metal holding container, blast furnace slag (CaO = 42 wt%, S
iO ₂ = 33 wt%, MgO = 7 wt%, Al ₂ O ₃ =
15 wt%), and the amount of residual slag was 450 kg from the measurement of slag thickness.

The target of silicon concentration after desiliconization is 0.12 w
As t%, the total amount of oxygen gas added to the desiliconization treatment is 75N
m ³ , and the total amount of iron ore sintered powder was 1120 kg. The amount of SiO ₂ produced by desiliconization was set to 3 from the target value
Estimated to be 85 kg, residual slag amount before desiliconization treatment: 450
The basicity was estimated to be 0.35 from kg and the amount of SiO ₂ produced: 385 kg, and 195 kg of quick lime was added as a component adjusting agent to adjust the basicity to 0.7. Further, potassium carbonate was used as a potassium raw material, the target of K ₂ O concentration was set to 20 wt%, the yield was set to 90%, and the addition amount of potassium carbonate was calculated to be 420 kg.

Then, the oxygen gas flow rate from the top-blown oxygen lance was set to 850 to 950 Nm ³ / hr and continuously blown onto the surface of the hot metal, and the iron ore sintered powder addition rate was set to 200 to 25.
It is continuously added at 0 kg / min, nitrogen gas is used as a carrier gas, and quick lime as a component adjusting agent is blown into the hot metal at 60 to 70 kg / min by an injection lance, and potassium carbonate is added at 120 to 160 kg / min. It was added on top at a rate, and the potassium raw material and the component modifier were added during the desiliconization treatment. And after about 3 minutes from the start of treatment, quicklime 1
The addition of 95 kg and 420 kg of potassium carbonate was completed, and the desiliconization treatment and the production of the potassium soluble fertilizer were completed in 5 minutes. The hot metal temperature after the treatment was 1390 ° C.

Thereafter, the generated molten slag was scraped out from the hot metal holding container into a Noropan once by using a slag scraper, and then cooled and solidified by an air crushing method to obtain 1267 kg of granular slag having a diameter of about 5 mm to obtain a high solubility. It was potash fertilizer.
The components of this black soluble potassium fertilizer, the yield of potassium carbonate, and the analytical values of the black soluble potassium and the water soluble potassium are shown in Tables 1 and 2 above. As shown in these tables, K ₂ in the black soluble potassium fertilizer is shown. The O content was 20.8 wt%, of which 94% was soluble in Cu, and the yield of potassium carbonate was 92%. The soluble magnesium content was 1.8 wt%.

[Example 4] Similar to Example 1, the present invention was carried out in the desiliconizing treatment facility shown in FIG. The hot metal tapped from the blast furnace was transferred to a desiliconization treatment facility. The weight of hot metal is 150
Ton, hot metal composition is carbon; 4.52 wt%, silicon;
22 wt%, phosphorus; 0.096 wt%, sulfur; 0.037
The wt% and the hot metal temperature were 1392 ° C. In the hot metal holding container, blast furnace slag (CaO = 44 wt%, S
iO ₂ = 35 wt%, MgO = 6 wt%, Al ₂ O ₃ =
12 wt%) and the amount of residual slag is 42 by visual observation.
It was 0 kg.

First, desiliconization treatment was performed. Desiliconization treatment is
Oxygen gas flow rate from top blowing oxygen lance is 800-900
It is continuously sprayed as Nm ³ / hr onto the surface of the hot metal, and the iron ore sintered powder addition rate is continuously set at 200 to 240 kg / min, and nitrogen gas is continuously added into the hot metal by an injection lance. Blowing was completed for 5 minutes to complete the desiliconization treatment. The total amount of oxygen gas added was 70 Nm ³ , the total amount of iron ore sintered powder was 1100 kg, and the hot metal temperature after desiliconization was 1
It was 352 ° C.

The silicon concentration in the hot metal after desiliconization is 0.10 w
t%, SiO by desiliconization treatment ₂Desiliconization
From the silicon concentration in the hot metal before and after the treatment, it was estimated to be 385 kg.
It was In addition, the amount of residual slag before desiliconization; 420 kg,
SiO made₂From the amount of 385 kg, the basicity of 0.3
Estimated to be 5, and to adjust the basicity to 0.7
Then, 190 kg of quick lime was added. Also, Cali
Using potassium carbonate as a raw material, K₂20w target of O concentration
Calculate the amount of potassium carbonate added as t% and yield as 90%
It was taken out and determined to be 405 kg.

Next, a black soluble potassium fertilizer was produced. First, before the addition of potassium carbonate, quick lime as a component adjusting agent was added to 60 to 7 together with nitrogen gas from the injection lance.
Blowing into hot metal at 0 kg / min for 190 minutes in 3 minutes
g addition is complete. Then, the injection lance was pulled up from the hot metal, and powdery potassium carbonate was added directly onto the desiliconization slag along with nitrogen gas at a rate of 70 to 90 kg / min by spraying onto the desiliconization slag, and continuously added for 6 minutes. The addition of 405 kg was completed. After the addition of potassium carbonate was completed, the injection lance was lowered into the hot metal, and nitrogen gas was blown into the hot metal for 2 minutes to promote the fusion of the desiliconized slag and the potassium carbonate to obtain a molten slag.

Thereafter, the generated molten slag was scraped out from the hot metal holding container into a Noropan once by using a slag scraper, and then cooled and solidified by an air crushing method to obtain 1190 kg of granular slag having a diameter of about 5 mm to obtain a high solubility. It was potash fertilizer.
The components of this black soluble potassium fertilizer, the yield of potassium carbonate, and the analytical values of the black soluble potassium and the water soluble potassium are shown in Tables 1 and 2 above. As shown in these tables, K ₂ in the black soluble potassium fertilizer is shown. The O content was 21.8 wt%, 92% of which was soluble in Cu, and the yield of potassium carbonate was 94%. The soluble magnesium content was 1.7 wt%.

[0069]

EFFECTS OF THE INVENTION In the present invention, a potassium raw material is added to a desiliconized slag containing SiO ₂ as a main component to produce a fusible potassium fertilizer. Therefore, the amount of heat for heating the desiliconized slag is unnecessary and the potassium raw material is used. The hot metal supplies the amount of heat required for melting, decomposing, and fusing, and it has extremely high thermo-economic efficiency. Furthermore, since it does not require heating time for desiliconization slag, it can be manufactured in a short time, resulting in a large manufacturing cost. Can be reduced to And since it is possible to effectively utilize the desiliconized slag that was difficult to make into a profitable material, it is possible to produce the fusible potash fertilizer with the existing steelmaking equipment without installing new production equipment, so that the industrial effect is great. is there.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a hot metal desiliconization treatment facility according to the present invention.

[Explanation of symbols]

1 Hot metal holding container 2 hot metal 3 dolly 4 Desiliconization slag 5 Potassium raw material 6 Top-blown oxygen lance 7 injection lance 8 component regulator

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C21C 5/36 C21C 5/36 7/04 7/04 B (72) Inventor Norio Isoo 1-2-1, Marunouchi, Chiyoda-ku, Tokyo (56) Reference JP 61-281807 (JP, A) JP 61-17483 (JP, A) JP 60-127286 (JP, A) JP 60-82606 (JP, A) JP 59-227717 (JP, A) JP 58-153722 (JP, A) JP 56-96012 (JP, A) JP 56-81616 (JP, A) JP-A-56-47511 (JP, A) JP-A-56-35713 (JP, A) JP-A-55-51785 (JP, A) JP-A-52-38366 (JP, A) JP-B-35-8627 ( JP, B1) Japanese Patent Publication Sho 31-6868 (JP, B1) Patent 2451872 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB Name) C05B 1/00-C05G 5/00 C21C 1/00-7/10

Claims (10)

(57) [Claims] 1. A process of placing a potassium raw material on top of a hot metal holding vessel containing desiliconized hot metal and desiliconized slag produced during the desiliconizing of the hot metal , and adding the hot metal to the hot metal holding container. A method for producing a fusible potash fertilizer, comprising: a step of blowing a stirring gas into the mixture to stir to fuse the desiliconized slag and a potassium raw material; and a step of cooling and solidifying the fused slag. 2. A pottery raw material is placed on top of a hot metal holding vessel containing desiliconized hot metal and desiliconized slag produced during the desiliconization of the hot metal, and the components are adjusted.
A step of adding an agent, a step of blowing a stirring gas into the hot metal and stirring, and a step of fusing the desiliconization slag, the potassium raw material and the component adjusting agent, and a step of cooling and solidifying the slag produced by the fusing. A method for producing a water-soluble potassium fertilizer. 3. The desiliconization slag and potassium raw material produced by the desiliconization treatment by adding a potassium raw material during the desiliconization treatment of the hot metal using the stirring gas in the hot metal holding container A method for producing a fusible potassium fertilizer, which comprises a step of stirring and fusing the slag and a step of cooling and solidifying the slag produced by the fusing. 4. A desiliconized slag and a potassium raw material and components produced by the desiliconization treatment by adding a potassium raw material and a component modifier during the desiliconization treatment of the hot metal using a stirring gas in a hot metal holding container. A method for producing a potassium soluble fertilizer, comprising: a step of agitating the adjusting agent with the agitating gas for fusion; and a step of cooling and solidifying the slag produced by the fusion. 5. The method for producing a potassium soluble fertilizer according to claim 2, wherein the component modifier is a substance containing a compound of Mg. 6. The composition according to claim 2, wherein the component modifier is added by blowing it into the hot metal by a carrier gas.
And the method for producing the black soluble potassium fertilizer according to claim 5. 7. The method for producing a fusible potash fertilizer according to claim 3, wherein the potash raw material is placed on top and added. 8. The method for producing a fusible potash fertilizer according to claim 1, wherein the potash raw material is briquette. 9. claims, characterized in that the addition by blowing potassium raw material into molten iron by a carrier gas 3 or claim 4
The method for producing the black soluble fertilizer as described in. 10. The production of the fusible potash fertilizer according to claim 3 or 4 , wherein the potassium raw material is added to the desiliconized slag by blowing it into the desiliconized slag by a carrier gas or by blasting it onto the desiliconized slag. Method.