JP2005125145A - Manufacturing method of inorganic molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an inorganic molded product having high strength using a water soluble salt of a metal element showing acidity in an aqueous solution form as a raw material. <P>SOLUTION: This inorganic molded product is manufactured by molding a kneaded material, which contains the water-soluble salt of at least one metal element arbitrarily selected from Groups III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV and XV of the periodic table, of which the aqueous solution exhibits acidity, water, urea, a hardly soluble inorganic matter, an inorganic binder, an organic binder and a reinforcing material and drying the obtained molded object to bake the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a molded body made of an inorganic material. More specifically, catalysts used for the decomposition treatment of organic halogen compounds such as dioxins and nitrogen oxides in exhaust gas discharged from waste incinerators and industrial waste treatment facilities, and waste incinerators and industrial waste treatment facilities The present invention relates to a method for producing an inorganic molded body useful for a heat insulating material or the like used in the above.

  2. Description of the Related Art In recent years, compacts made of inorganic materials are used as catalysts and heat insulating materials in heat treatment furnaces, municipal waste incinerators, and industrial waste treatment facilities in various factories. These inorganic compacts have a granular shape, a plate shape, a honeycomb shape, or the like depending on the purpose of use.

  As a method for producing an inorganic molded body, for example, Patent Document 1 discloses that an ammonium salt of vanadium and tungsten is dissolved in a monoethanolamine aqueous solution, and this solution is combined with an aqueous solution of an ammonium salt of molybdenum, titania powder, and a molding aid. A method is disclosed in which a catalyst is obtained by kneading with an arm-type kneader and molding, drying and firing the kneaded material into a honeycomb structure with an extruder. In Patent Document 2, ammonium sulfate, barium sulfate, and metatitanic acid are added to a solution of vanadium compound having a valence less than pentavalent obtained by reducing ammonium metavanadate with oxalic acid to obtain a powdery mixture. A method for producing a catalyst in which clay (or bentonite powder or kaolin powder), glycerin, polysaccharides, and water are mixed to form a clay-like material, and the clay-like material is formed into a honeycomb shape by an extruder and then dried and calcined. Has been reported.

In Patent Document 1, a salt of a metal element whose aqueous solution is basic is used as a starting material for the active ingredient, and in Patent Document 2, a clay-like material that is a kneaded product is prepared after once preparing a dried powdery mixture. The catalyst is manufactured by molding, drying and firing.
JP 2000-42409 A Japanese Patent Publication No. 2-42536

  In the course of studying a method for producing a catalyst using a water-soluble salt of a metal element as a raw material for the active ingredient, the present inventors have used a water-soluble metal element such as vanadyl sulfate, whose aqueous solution is acidic, as a starting material for the active ingredient. It has been found that when a salt is used, it is difficult to obtain a high-strength molded article by the method described in the prior art. Therefore, an object of this invention is to provide the manufacturing method of the high intensity | strength inorganic molded object which uses the water-soluble salt of the metal element in which aqueous solution shows acidity as a raw material.

  As a result of intensive studies to solve the above problems, the present inventors have found that urea is mixed with a water-soluble salt of a metal element whose aqueous solution is acidic, a poorly soluble inorganic substance, an inorganic binder, an organic binder, and a reinforcing material. The inventors have found that the above problems can be solved by coexistence, and have reached the present invention.

  The present invention relates to Group 3, Group 4, Group 5, Group 6, Group 8, Group 8, Group 9, Group 10, Group 11, Group 10 of the Periodic Table where the aqueous solution is acidic. A kneaded material containing a water-soluble salt of one or more metal elements arbitrarily selected from Group 12, Group 13, Group 14, and Group 15, water, urea, a hardly soluble inorganic material, an inorganic binder, an organic binder, and a reinforcing material It is related with the manufacturing method of the inorganic molded object characterized by drying after baking and baking.

  The present invention also includes ferric sulfate, vanadyl sulfate, cupric sulfate, vanadium oxychloride, chromium chloride, cobalt chloride, nickel chloride, cupric chloride, zirconium oxychloride, vanadyl oxalate, zirconium oxynitrate, chromium nitrate. One or more water-soluble salts selected from the group consisting of manganese nitrate, ferric nitrate, cobalt nitrate and titanium sulfate, one or more sparingly soluble inorganic oxidations selected from water, urea, titanium dioxide and silica One or more sparingly soluble inorganic sulfates selected from barium sulfate and calcium sulfate, one or more inorganic binders selected from activated clay and kaolin, polyethylene glycol, polyethylene oxide, polyvinyl alcohol and methylcellulose, and these One or more organic binders selected from the group consisting of derivatives And loaders, after forming the kneaded product comprising a glass fiber, dried, a process for producing inorganic molded body and firing.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a high intensity | strength inorganic molded object can be provided.

  The water-soluble salt of a metal element in which the aqueous solution used in the present invention is acidic has a pH of the salt aqueous solution of less than 7 and a solubility of more than 0.5 g with respect to 100 g of water at 25 ° C. Is defined.

  Examples of the metal element constituting the water-soluble salt of the metal element in which the aqueous solution used in the present invention is acidic include Group 3, Group 4, Group 5, Group 6, Group 7 and Group 8 of the Periodic Table. There is no particular limitation as long as it is a metal element belonging to Group 10, Group 9, Group 10, Group 11, Group 12, Group 13, Group 14, Group 15. Among these groups, metal elements of Group 4, Group 5, Group 6, Group 7, Group 8, Group 9, Group 10, Group 11 of the Periodic Table are preferable, and among these, zirconium One or more metal elements selected from the group consisting of titanium, vanadium, chromium, manganese, iron, cobalt, nickel and copper are more preferred.

  The water-soluble salt of the above metal element in which the aqueous solution used in the present invention is acidic is not limited as long as it satisfies the above definition. Examples of such salts include formate, acetate, maleate, citrate, sulfate, oxysulfate, chloride, oxychloride, oxalate, oxyoxalate, nitrate, and oxynitrate. Can be mentioned. Among these, one or more water-soluble salts selected from the group consisting of sulfate, oxysulfate, chloride, oxychloride, oxalate, oxyoxalate, nitrate, and oxynitrate are preferable.

  Examples of the water-soluble salt used in the present invention include ferric sulfate, vanadyl sulfate, cupric sulfate, vanadium oxychloride, chromium chloride, cobalt chloride, nickel chloride, cupric chloride, zirconium oxychloride, and oxalic acid. Examples thereof include vanadyl, zirconium oxynitrate, chromium nitrate, manganese nitrate, ferric nitrate, cobalt nitrate, and titanium sulfate. These may be used alone or in combination of two or more.

  Examples of the water-soluble salt of the metal element in which the aqueous solution used in the present invention is acidic include, for example, Group 3, Group 4, Group 5, Group 6, Group 7, Group 8, Group 8 of the Periodic Table. Sulfate, oxysulfate, chloride, oxy of one or more metal elements arbitrarily selected from Group 9, Group 10, Group 11, Group 12, Group 13, Group 14, Group 15 One salt selected from the group consisting of chloride, oxalate, oxyoxalate, nitrate and oxynitrate can be used alone or in combination of two or more. Moreover, the 3rd group, the 4th group, the 5th group, the 6th group, the 7th group, the 8th group, the 9th group, the 10th group, the 11th group, the 12th group, the 13th group of the periodic table, Consists of sulfate, oxysulfate, chloride, oxychloride, oxalate, oxyoxalate, nitrate and oxynitrate of two or more metal elements arbitrarily selected from Group 14 and Group 15. Two or more of the same type of salt selected from the group (different metal elements) or different types of salts may be used in combination.

  Among the water-soluble salts of the above metal elements, the aqueous solution of which is acidic, one or more water-soluble salts selected from the group consisting of zirconium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, and copper are inorganic. It is preferable because high strength can be imparted to the molded body. Among these, a water-soluble salt of vanadium is more preferable, and vanadyl sulfate is particularly preferable because it gives higher strength to the inorganic molded body.

  The sparingly soluble inorganic substance in the present invention is not particularly limited as long as the inorganic substance has a solubility in 100 g of water at 25 ° C. of 0.5 g or less. Examples of the hardly soluble inorganic substance include a hardly soluble inorganic oxide and a hardly soluble inorganic sulfate. Examples of the hardly soluble inorganic oxide include oxides of one or more metal elements selected from the group consisting of silicon, titanium, zirconium, niobium, molybdenum, tungsten and chromium, which are usually used as carriers. The hardly soluble inorganic oxides can be used alone or in combination of two or more. Examples of the hardly soluble inorganic sulfate include sulfates of one or more metal elements selected from the group consisting of magnesium, calcium, strontium, and barium. The hardly soluble inorganic sulfates can be used alone or in combination of two or more. A combination of a hardly soluble inorganic oxide and a hardly soluble inorganic sulfate can also be used. For example, the combination of the oxide of titanium and the oxide of silicon, the combination of the oxide of titanium, and barium sulfate is mentioned. Among the hardly soluble inorganic materials, one or more selected from the group consisting of titanium dioxide, silica, barium sulfate and calcium sulfate can be suitably used, and among these, a combination of oxide and sulfate is preferable, A combination of titanium dioxide and barium sulfate is preferred.

  The inorganic binder in the present invention is not particularly limited as long as the kneaded material containing the binder exhibits plasticity and shape retention. Examples of the inorganic binder include clay minerals containing smectite swellable clay such as activated clay, bentonite and montmorillonite as main components, or kaolin. Among these, one or more selected from activated clay and kaolin can be suitably used.

  The reinforcing material in the present invention is not particularly limited as long as it can increase the strength of the molded body after firing. For example, a glass fiber, a carbon fiber, a silicon carbide fiber, a whisker, or the like that is acicular or fibrous and that can be oriented in the molded body during molding to improve the molded body strength is preferable. Among these, glass fiber is preferable in terms of ease of handling such as ease of mixing.

  The organic binder in the present invention is not particularly limited as long as it imparts viscosity to a kneaded material containing the organic binder. As the organic binder, for example, a nonionic one that dissolves or swells in water is preferable. As the organic binder, for example, at least one selected from polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, polyethylene oxide, polyacrylamide, polyvinyl pyrrolidone, and derivatives thereof can be suitably used. Among these, those selected from the group consisting of polyvinyl alcohol, polyethylene glycol, polyethylene oxide, methyl cellulose, and derivatives thereof are preferable because of the large effect of improving the strength of the molded product.

  Urea in the present invention is not particularly limited as long as it does not contain 500 ppm or more of an alkali or alkaline earth element as an impurity. Urea satisfying such conditions can be easily obtained as a commercial product.

  Water in the present invention is not particularly limited as long as it does not contain 500 ppm or more of an alkali or alkaline earth element as an impurity. Examples of water that satisfies such conditions include ion exchange water and distilled water.

  In the present invention, the mixing ratio of each component excluding water in the kneaded product is 0.5 to 90% by mass, preferably 1 to 50% by mass, more preferably 1 to 50% by mass, of the above water-soluble salt of the metal element in which the aqueous solution is acidic. Is in the range of 2-20% by weight, urea is in the range of 0.01-20% by weight, preferably in the range of 0.1-15% by weight, more preferably in the range of 0.5-8% by weight, and the sparingly soluble inorganic substance is in the range of 1-95% by weight. %, Preferably 20 to 90% by weight, more preferably 35 to 85% by weight, organic binder 0.01 to 20% by weight, preferably 0.1 to 15% by weight, more preferably 0.3 to 8%. In the range of mass%, the inorganic binder is 0.01 to 60 mass%, preferably 0.1 to 30 mass%, more preferably 0.3 to 20 mass%, the reinforcing material is 0.01 to 30 mass%, Preferably 0.1 to 20% by mass, Mashiku can be selected from each of the range of 0.3 to 10 mass%. The water content in the kneaded product can be selected from the range of 5 to 50% by mass, preferably 8 to 40% by mass, and more preferably 12 to 35% by mass.

  In the present invention, the method for preparing the kneaded material comprising the above components is not particularly limited. As a method of preparing the kneaded product, for example, a mixture of a reinforcing agent dispersed in an aqueous solution of the above-mentioned water-soluble salt and a mixed powder of a sparingly soluble inorganic material and an inorganic binder are put into a mixer, and then an aqueous urea solution and an organic binder are added. A method of kneading with a kneader after sequentially adding and mixing is mentioned. The kneading by the kneader may be performed until the components in the mixture are uniformly dispersed, and a kneading time of 5 to 60 minutes is usually sufficient depending on the performance of the kneader. After molding the kneaded product obtained in this way, an inorganic molded body is obtained by drying and firing. As a molding method of the kneaded product, molding can be performed while maintaining the temperature in the molding machine at room temperature to 50 ° C.

  As a drying method after forming the kneaded product, it can be performed at a temperature of 60 to 120 ° C. From the viewpoint of preventing cracks such as cracks, it is desirable to perform drying while adjusting the humidity. As a baking method of the molded product after drying, it can be performed at a temperature of 350 to 600 ° C. When raising the temperature, it is desirable to gradually raise the temperature to a predetermined temperature over about 1 to 5 days from the viewpoint of preventing cracking due to combustion heat due to combustion of the organic binder.

  For example, when the inorganic molded body is formed into a honeycomb shape or a three-dimensional network shape, it can be manufactured as follows, for example. First, a mixture of a reinforcing material dispersed in an aqueous solution of a water-soluble salt and a mixed powder of a poorly soluble inorganic substance and an inorganic binder are put into a mixer, and then an aqueous urea solution and an aqueous organic binder solution are added sequentially, and 5 to 60 minutes. The resulting mixture is kneaded with a kneader such as a kneader for about 5 to 60 minutes under reduced pressure. The obtained cake-like substance is put into a plunger-type or screw-type extruder and molded, and the temperature is raised from room temperature to around 90 ° C. over 1 to 30 days to prevent cracks and the like and dried. At that time, it is preferable to perform humidity control drying in which the humidity in the dryer is reduced from 100% to 0%. Firing is performed by raising the temperature from room temperature to a predetermined temperature over 1 to 10 days. A high-strength molded body can be obtained by such treatment.

By molding the kneaded product, a molded body having a desired shape and size can be obtained. Examples of such a molded body include a pellet-shaped molded body having a diameter of 1 to 50 mm and a length of 5 to 60 mm, a spherical molded body having a diameter of 1 to 50 mm, and a cell number of 1 square inch (2.54). A plate-shaped, honeycomb-shaped or three-dimensional network-shaped molded body having 5 to 400 per × 2.54 cm ² ) can be mentioned.

  The reason why a high-strength inorganic molded article can be obtained by coexisting with urea has not been clarified, but the action of urea prevents a decrease in binding due to salting out of an organic binder due to a water-soluble salt, or When the organic binder and urea have a crosslinked structure, the water-soluble salt, the hardly soluble inorganic salt, the bondability between the inorganic binder and the reinforcing material is improved, and the strength of the inorganic molded body is improved by the action such as Presumed.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
[Examples 1 to 24]
(Inorganic product A)
50 kg of water and 15 kg of ferric sulfate were added to the mixer to prepare a solution, and 10 kg of glass fiber was dispersed to obtain a mixed solution A. 100 kg of titanium dioxide, 40 kg of barium sulfate, 24 kg of activated clay, 5 kg of polyethylene oxide (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox E-240) were sequentially added thereto. To this was added 10 kg of urea. The obtained clay-like material was transferred to a kneader and kneaded for 20 minutes, and then this was kneaded for 20 minutes using an extruder, and the number of cells per side inch (2.54 × 2.54 cm ² ) was 167 mm wide, 167 mm high, 600 mm deep. Were formed into 35 honeycomb formed bodies. This was heated from room temperature to 85 ° C. over 14 days and dried, and further heated from room temperature to 430 ° C. over 3 days and fired to obtain a molded product A.
(Inorganic molding B)
After mixing 50 kg of water and 15 kg of vanadyl sulfate in the mixer to make a solution, 2.5 kg of polyvinyl alcohol water-absorbent resin (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name: Aqua Reserve GP) and 10 kg of glass fiber are dispersed and mixed. A. 100 kg of titanium dioxide, 40 kg of barium sulfate, 24 kg of activated clay, 5 kg of polyethylene oxide (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox E-240) were sequentially added thereto. To this was added 10 kg of urea. The obtained clay-like material was transferred to a kneader and kneaded for 20 minutes, and then this was kneaded for 20 minutes using an extruder, and the number of cells per side inch (2.54 × 2.54 cm ² ) was 167 mm wide, 167 mm high, 600 mm deep. Were formed into 35 honeycomb formed bodies. This was heated from room temperature to 85 ° C. over 14 days and dried, and further heated from room temperature to 430 ° C. over 3 days and fired to obtain a molded product A.
(Inorganic moldings C to O)
The inorganic compacts C to O were prepared in the same manner as the preparation of the inorganic compact A except that the ferric sulfate used for the preparation of the inorganic compact A was changed to the inorganic salt (water-soluble salt) shown in Table 1. Obtained.

(Inorganic molding P)
50 kg of water and 15 kg of vanadyl sulfate were added to the mixer to prepare a solution, and 10 kg of glass fiber was dispersed to prepare a mixed solution A. Titanium dioxide 100 kg, barium sulfate 40 kg, activated clay 24 kg, methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: Metroles SM4000) 2.5 kg, polyethylene oxide (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox) E-240) 5 kg was sequentially charged. To this was added 10 kg of urea. The obtained clay-like material was transferred to a kneader and kneaded for 20 minutes, and then this was kneaded for 20 minutes using an extruder, and the number of cells per side inch (2.54 × 2.54 cm ² ) was 167 mm wide, 167 mm high, 600 mm deep. Were formed into 35 honeycomb formed bodies. This was heated from room temperature to 85 ° C. over 14 days and dried, then further heated from room temperature to 430 ° C. over 3 days and fired to obtain a molded product P.
(Inorganic molding Q)
An inorganic molded product Q was obtained by the same method as the method for preparing the inorganic molded product P, except that the polyethylene oxide used for the preparation of the inorganic molded product P was not used.
(Inorganic molding R)
50 kg of water and 15 kg of vanadyl sulfate were added to the mixer to prepare a solution, and 10 kg of glass fiber was dispersed to prepare a mixed solution A. This includes 100 kg of titanium dioxide, 40 kg of barium sulfate, 24 kg of activated clay, 2.5 kg of polyethylene oxide water-absorbing resin (manufactured by Sumitomo Seika Co., Ltd .: trade name Aqua Coke), polyethylene oxide (manufactured by Meisei Chemical Industry Co., Ltd.) Name: Alcox E-240) 5 kg was sequentially charged. To this was added 5 kg of urea. The obtained clay-like material was transferred to a kneader and kneaded for 20 minutes, and then this was kneaded for 20 minutes using an extruder, and the number of cells per side inch (2.54 × 2.54 cm ² ) was 167 mm wide, 167 mm high, 600 mm deep. Were formed into 35 honeycomb formed bodies. This was heated from room temperature to 85 ° C. over 14 days and dried, and further heated from room temperature to 430 ° C. over 3 days and fired to obtain a molded product R.
(Inorganic molding S)
An inorganic molded body T was obtained in the same manner as the method for preparing the inorganic molded body R except that 5 kg of urea used for the preparation of the inorganic molded body R was changed to 10 kg.
(Inorganic molding T)
An inorganic compact T was obtained in the same manner as the method for preparing the inorganic compact S except that the activated clay used for the preparation of the inorganic compact S was changed to kaolin.
(Inorganic molding U)
An inorganic molded body U was obtained in the same manner as the method for preparing the inorganic molded body S except that the barium sulfate used for the preparation of the inorganic molded body S was changed to calcium sulfate.
(Inorganic molding V)
50 kg of water and 15 kg of titanium sulfate were added to the mixer to prepare a solution, and 10 kg of glass fiber was dispersed to prepare a mixed solution A. 100 kg of silica (manufactured by Nippon Aerosil Co., Ltd., trade name: Aerosil-300), 40 kg of calcium sulfate, 24 kg of activated clay, 5 kg of polyethylene oxide (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox E-240) Sequentially charged. To this was added 10 kg of urea. The obtained clay-like material was transferred to a kneader and kneaded for 20 minutes, and then this was kneaded for 20 minutes using an extruder, and the number of cells per side inch (2.54 × 2.54 cm ² ) was 167 mm wide, 167 mm high, 600 mm deep. Were formed into 35 honeycomb formed bodies. This was heated from room temperature to 85 ° C. over 14 days and dried, and further heated from room temperature to 430 ° C. over 3 days and fired to obtain a molded body V.
(Inorganic molding W)
An inorganic compact W was obtained in the same manner as the method for preparing the inorganic compact V except that the titanium sulfate used for the preparation of the inorganic compact V was changed to vanadyl sulfate.
(Inorganic molding X)
After kneading by the same method as the method for preparing the inorganic molded body R, this was molded into a pellet-shaped (cylindrical) molded body having a length of 10 mm and a diameter of 3.2 mm using an extruder. This was heated from room temperature to 85 ° C. over 1 day and dried, and further heated from room temperature to 430 ° C. over 1 day and fired to obtain a molded product X.

[Comparative Examples 1-4]
(Inorganic molding 1)
An inorganic molded body 1 was obtained by the same method as the method for preparing the inorganic molded body A, except that urea used for the preparation of the inorganic molded body A was not added.
(Inorganic molding 2)
An inorganic molded body 2 was obtained by the same method as the method for preparing the inorganic molded body B except that urea used for the preparation of the inorganic molded body B was not added.
(Inorganic molding 3)
An inorganic molded body 3 was obtained by the same method as the method for preparing the inorganic molded body B except that the polyvinyl alcohol-based water absorbent resin and polyethylene oxide used for the preparation of the inorganic molded body B were not added.
(Inorganic molding 4)
An inorganic molded body 4 was obtained in the same manner as the method for preparing the inorganic molded body X except that urea used for the preparation of the inorganic molded body X was not added.

Using these inorganic compacts, tests were conducted under the following conditions. The results are shown in Tables 2 and 3.
1) Crushing strength test The crushing strength test was performed using a Kiyama hardness tester under conditions of a test speed of 10 mm / min and a temperature of 23 ° C.
About the said molded object AW, 1-3, it cuts out to 14 mm x 14 mm x 14 mm, and produces the sample for a measurement, A load is applied to the cell side surface of this measurement sample perpendicularly | vertically (in the rectangular opening surface direction of a cell). (Table 2).
Moreover, about the molded objects X and 4, it measured by applying a load to the side part (diameter direction of a circular cross section) of a cylindrical pellet (Table 3).
2) Appearance inspection With respect to the molded body catalysts A to W, the number of cracks in the honeycomb outer skin was visually measured.

  INDUSTRIAL APPLICATION This invention is useful for manufacturing a high intensity | strength inorganic molded object using the water-soluble salt of the metal element in which aqueous solution shows acidity. Moreover, the inorganic molded object obtained by the manufacturing method of this invention is useful as materials, such as a catalyst or a heat insulation raw material by which high intensity | strength is calculated | required.

Claims (9)

  Groups 3, 4, 5, 6, 7, 8, 9, 9, 10, 11, 12, and 12 of the periodic table in which the aqueous solution is acidic After forming a kneaded product containing a water-soluble salt of one or more metal elements arbitrarily selected from Group 13, Group 14, and Group 15, water, urea, a hardly soluble inorganic material, an inorganic binder, an organic binder, and a reinforcing material , Drying and firing, a method for producing an inorganic molded article.   The inorganic molded article according to claim 1, wherein the water-soluble salt is a water-soluble salt of one or more metal elements selected from the group consisting of zirconium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, and copper. Manufacturing method.   The method for producing an inorganic molded article according to claim 1, wherein the water-soluble salt is a water-soluble salt of vanadium.   The water-soluble salt is at least one water-soluble salt selected from the group consisting of sulfate, oxysulfate, chloride, oxychloride, oxalate, oxyoxalate, nitrate, and oxynitrate. The manufacturing method of the inorganic molded object as described in 1, 2 or 3.   The method for producing an inorganic molded article according to claim 1, wherein the water-soluble salt is vanadyl sulfate.   2. The one or more kinds selected from the group consisting of oxides of titanium, silicon, molybdenum, chromium, niobium, zirconium and tungsten and sulfates of magnesium, calcium, strontium and barium. 6. The method for producing an inorganic molded article according to any one of 5 above.   In the kneaded product, the organic binder is selected from the group consisting of polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, polyethylene oxide, polyacrylamide, polyvinyl pyrrolidone, and derivatives thereof. The inorganic substance according to any one of claims 1 to 6, wherein the inorganic substance contains at least one species, and the content of the organic binder in the kneaded product is 0.01 to 20% by mass of the total component excluding water. Manufacturing method of a molded object.   Ferric sulfate, vanadyl sulfate, cupric sulfate, vanadium oxychloride, chromium chloride, cobalt chloride, nickel chloride, cupric chloride, zirconium oxychloride, vanadyl oxalate, zirconium oxynitrate, chromium nitrate, manganese nitrate, nitric acid One or more water-soluble salts selected from the group consisting of ferric iron, cobalt nitrate and titanium sulfate, water, urea, one or more sparingly soluble inorganic oxides selected from titanium dioxide and silica, and barium sulfate And one or more sparingly soluble inorganic sulfates selected from calcium sulfate, one or more inorganic binders selected from activated clay and kaolin, polyethylene glycol, polyethylene oxide, polyvinyl alcohol, methylcellulose, and derivatives thereof. One or more selected organic binders and glass After molding the kneaded product containing the fibers, dried, the manufacturing method of the inorganic molded body and firing.   The method for producing an inorganic compact according to any one of claims 1 to 8, wherein the content of urea in the kneaded product is 0.01 to 20% by mass of the total components excluding water.