TW201414676A - Particulate composition containing nitrate salt, method for producing same, glass, and method for storing nitrate salt - Google Patents

Abstract

One purpose of the present invention is to provide a highly safe and easily handleable material which contains strontium nitrate or barium nitrate, said highly safe material containing strontium nitrate or barium nitrate being reduced in potential risk of the oxidizing power and the sensitivity to an impact. A particulate composition of the present invention contains a hydrophobic silica and strontium nitrate and/or barium nitrate. A method for producing a particulate composition of the present invention comprises a step for mixing a hydrophobic silica with strontium nitrate and/or barium nitrate.

Description

Granular composition containing nitrate, method for producing the same, glass, and method for preserving nitrate

The present invention relates to a particulate composition containing a nitrate, a method for producing the same, a glass formed of the particulate composition, and a method for preserving a nitrate.

Barium nitrate or barium nitrate can be used as a raw material for gunpowder or flame tube. Further, cerium nitrate can also be used as a gas generating agent for an airbag of an automobile (for example, Patent Document 1).

Lanthanum nitrate or lanthanum nitrate is a kind of chemistry that ignites combustibles and causes intense burning or explosion. It is a UN based on the UN Recommendations, "Recommendation on the TRANSPORT OF DANGEROUS GOODS-Manual of Tests and Criteria-Third revised edition". Substance in the burning test of the proposed CLASS 5-Division 5.1 (oxidizing solid) that meets the conditions of the dangerous substance. Such a hazard exposes the worker handling it to danger and has a safety problem. Further, when processing in a factory or the like, it is necessary to provide fireproof or explosion-proof equipment in order to ensure safety, and it is severely restricted in terms of handling and storage, and is also disadvantageous in terms of cost.

Further, cerium nitrate or cerium nitrate is not limited to gunpowder use, and is a material which is also expected to be a raw material of ceramics or glass. When used as a raw material for ceramics or glass, its oxidizing properties pose a threat to the safety of forming and handling. As such, as a raw material for ceramics or glass, it is required to be modified to exclude dangerous and safe materials.

Heretofore, as a method of modifying cerium nitrate or cerium nitrate, a method of preventing the solidification of particles by containing an appropriate amount of fine ceric acid has been disclosed (Patent Document 2). However, the usual effect of particulate niobic acid on reducing the risk of explosion or burning is not sufficient.

As a prior method for reducing the risk of explosion or burning, there is a method of adding an alkylbenzenesulfonic acid. As a surfactant, alkyl benzene sulfonic acid can be used as a synthetic lotion for household and business use (washing, kitchen), and alkyl benzene sulfonic acid can also be used as a dyeing auxiliary, pesticide emulsifier, refining Agent, dispersant or cosmetic. On the other hand, alkylbenzenesulfonic acid has a problem of foaming or biodegradability in rivers or sewage treatment plants which is lower than other conventional surfactants, and is not suitable as an additive when considering drainage treatment in industrial production.

Further, the risk can be reduced by coarsening the particles, but there is a problem that it is not suitable for industrially large-scale, continuous production, and it is difficult to uniformly mix them in various applications.

Patent Document 1: Japanese Patent Laid-Open No. Hei 11-228133

Patent Document 2: Japanese Laid-Open Patent Publication No. 2002-362921

One of the objects of the present invention is to provide a material which is safer, easier to handle, and contains cerium nitrate or cerium nitrate. Specifically, a material containing lanthanum nitrate or lanthanum nitrate which suppresses the potential risk of oxidizing power and is sensitive to impact and is highly safe is provided.

That is, the first aspect of the present invention relates to a particulate composition containing cerium nitrate and/or cerium nitrate and hydrophobic cerium oxide. The above hydrophobic cerium oxide preferably has a BET specific surface area of 50 to 400 m ² /g.

Preferably, the particulate composition is a CLASS 5-Division 5.1 (oxidizing solid) burning according to the UN recommendations "Recommendation on the TRANSPORT OF DANGEROUS GOODS-Manual of Tests and Criteria-Third revised edition". Those who do not meet the conditions of the dangerous substance in the test.

The particulate component preferably contains the above-mentioned cerium nitrate or cerium nitrate in an amount of 95.0 to 99.8 mass%.

The above particulate composition can be preferably used as a glass raw material.

Moreover, it is preferable that the particulate component contains 0.1 to 3.0% by mass of the above hydrophobic cerium oxide (wherein the total mass of the particulate component is 100% by mass).

A second aspect of the present invention relates to a method for producing a particulate composition comprising the steps of mixing cerium nitrate and/or cerium nitrate with hydrophobic cerium oxide.

A third aspect of the invention relates to a glass produced from the above particulate composition.

A fourth aspect of the present invention relates to a method for preserving cerium nitrate and/or cerium nitrate mixed with hydrophobic cerium oxide.

The present invention can suppress the flammability or explosiveness of the original cerium nitrate and/or cerium nitrate and reduce the risk by the action of specific cerium oxide. Thereby, the safety in use, storage, transportation, and the like can be improved. Moreover, since an explosion-proof apparatus or the like for ensuring safety is not required, it is also advantageous in terms of manufacturing equipment to contribute to cost reduction.

(cerium nitrate and barium nitrate)

The particulate composition of the present invention contains cerium nitrate and/or cerium nitrate. The cerium nitrate used in the present invention is not particularly limited, and a synthesizer or a commercially available one may be used. The method for synthesizing cerium nitrate is not particularly limited, and examples thereof include a method of neutralizing a reaction between cerium hydroxide and nitric acid, a method of converting cerium carbonate and nitric acid into a solution of cerium nitrate and carbonic acid, and chlorine. A method of adding sodium nitrate to a solution having a high concentration of hydrazine and reacting it.

The cerium nitrate used in the present invention is not particularly limited, and a synthesizer or a commercially available one may be used. The method for synthesizing cerium nitrate is not particularly limited, and examples thereof include a method of causing nitric acid to act on cerium carbonate or cerium sulfide.

(cerium oxide)

In general, cerium oxide has a stanol group (Si-O-H) on its solid surface, and thus has a high affinity with water. Such cerium oxide is called "hydrophilic cerium oxide". On the other hand, a surface which is hydrophobized by a decane treatment or a decane coupling treatment on the surface of the cerium oxide is referred to as "hydrophobic cerium oxide". "Hydrophobic cerium oxide" is used in the present invention.

There is no limitation on the primary cerium oxide before the hydrophobization treatment, and cerium oxide obtained by a known method can be used. For example, it is represented by fumed silica, wet cerium oxide, and the like.

Examples of the smoked cerium oxide include vapor phase cerium oxide obtained by burning a cerium compound or a metal cerium in an oxyhydrogen flame.

As the wet cerium oxide, it can be mentioned that it is precipitated in a solution by neutralizing sodium citrate Precipitation method of cerium oxide.

Further, a sol-gel method of cerium oxide or the like obtained by hydrolyzing an alkoxide of cerium in an aqueous organic solvent can also be used.

The hydrophobic cerium oxide is preferably obtained by treating the surface of the hydrophilic cerium oxide with a surface treating agent of dimethyl dichlorodecane, hexamethyldioxane, or xin. A decane coupling agent such as a decane such as a decane or a vinyl trimethoxy decane, a dimethyl polyoxy siloxane, a methyl hydrogen polyoxy siloxane or a fatty acid. However, the surface treatment agent is not limited to this.

The hydrophobic cerium oxide in the present invention preferably has a degree of hydrophobicity of 20% or more, more preferably 30% or more, still more preferably 50% or more. Further, the hydrophilic cerium oxide system has a degree of hydrophobization of approximately 0%. Here, the "hydrophobicity degree" means an organic solvent at the time point when all of the hydrophobic cerium oxide which is floated by dispersing the hydrophobic cerium oxide in water and dropping an organic solvent (for example, methanol) - The mass fraction (% by mass) of the organic solvent in the water mixed solution. The measurement can be carried out, for example, by adding 0.2 g of hydrophobic cerium oxide to 50 ml of ion-exchanged water while stirring with a magnetic stirrer while dropwise adding methanol from a burette. The floating hydrophobic cerium oxide is slowly precipitated, and the mass fraction (%) of methanol in the methanol-water mixed solution at the end of all precipitation is "hydrophobicity".

As the hydrophobic cerium oxide in the present invention, a commercially available product which satisfies the above conditions can be used. Examples of the hydrophobic cerium oxide include AEROSIL (R) (manufactured by Evonik Industries, Inc., for example, AEROSIL (R) R972, R974, R104, R106, R202, R805, R812, R812S, R816, R7200, R8200, and R9200. ), CAB-O-SIL (R) (manufactured by Cabot Corporation, such as CAB-O-SIL(R) TG-C413, TG-3180, TG-7120, TG -818F, TG-820F, TG-C390, TG-C122, TG-C190, TG-C243, TS-382, TS-530, TS-610, TS-630 and TS-720), REOLOSIL(R) Manufactured by Yamato Co., Ltd., such as REOLOSIL(R)DM-10, DM-20, DM-30, MT-10 and MT-20), WACKER(R) (Wacker Asahikasei Silicone Co., Ltd., WACKER(R) HDK -H15, HDK-H18, HDK-H20 and HDK-H30), Nipsil(R) (manufactured by TOSOH SILICA Co., Ltd., Nipsil(R)SS-10, SS-30S, SS-30P, SS-50 and SS- 50F) and so on.

The hydrophobic cerium oxide preferably has a BET specific surface area of 50 to 400 m ² /g, more preferably 75 to 300 m ² /g. The BET specific surface area means a value measured by a nitrogen adsorption BET 1 point method. The order of measurement is based on the provisions of JIS Z 8830.

(Particle composition)

The particulate composition of the present invention contains cerium nitrate and/or cerium nitrate and hydrophobic cerium oxide.

The particulate component of the present invention is not particularly limited, and a particulate component can be obtained by separately adding a required amount of cerium nitrate and/or cerium nitrate and mixing with hydrophobic cerium oxide. Moreover, the order of addition of each component is not specifically limited. The means for mixing is not particularly limited, and a known rotary solid mixer can be appropriately selected. Examples of the rotary solid mixer include a ribbon type, a uniaxial rotor type, a V type, a conical spiral type (Nauta) type, a double cone type, and a cylindrical type.

Further, it is preferable that cerium nitrate and/or cerium nitrate are uniformly mixed with the hydrophobic cerium oxide, and it is preferred that the cerium nitrate particles and/or the cerium nitrate particles are not easily broken. If the cerium nitrate particles and/or the cerium nitrate particles are broken, the solidification of the particulate composition may occur, and the safety may not be expected to be improved by the hydrophobic cerium oxide.

The amount of cerium nitrate or cerium nitrate in the particulate composition is not particularly limited, but is preferably 95 to 99.8% by mass, and more preferably 97 to 99.5% by mass.

The amount of the hydrophobic cerium oxide in the particulate composition is not particularly limited, but is preferably 0.1 to 3.0% by mass, more preferably 0.3 to 2.0% by mass, still more preferably 0.4 to 1.8% by mass. The total amount of cerium nitrate, cerium nitrate and hydrophobic cerium oxide is not more than 100% by mass. When the amount of the hydrophobic cerium oxide exceeds 3.0% by mass, it may not be uniformly mixed with cerium nitrate or cerium nitrate, and as a result, problems such as separation, adhesion to a container, and generation of dust may occur. Further, when the components are not uniformly mixed, there is a problem in that the glass composition is affected when the glass is produced using the particulate composition. Further, when the amount of the hydrophobic cerium oxide is too small, there is a case where it is not expected to improve the safety by the hydrophobic cerium oxide.

The particulate composition of the present invention is preferably a CLASS 5-Division 5.1 (oxidizing solid) recommended by the United Nations according to the UN Recommendation "Recommendation on the TRANSPORT OF DANGEROUS GOODS-Manual of Tests and Criteria-Third revised edition". Those who do not meet the dangerous conditions in the burning test. Here, "The United Nations recommended CLASS 5-Division 5.1 (oxidative solids) combustion test" (combustion test (i)) is as follows.

(combustion test (i))

The so-called combustion test (i) refers to the test for classifying the potential hazard of the oxidizing power of the test sample. In the order of the operation, the test sample was made into a powdery form and mixed with cellulose in a weight ratio of 1:1 and 4:1, and the total of the two was 30 g, and the mixture was formed into a conical shape. The ignition device held between the stack and the heat shield is applied for a maximum of 3 minutes until it is clearly known that it is completely ignited or not at all. Confirm whether each test mixed sample is burned and burned In the case, compare the average burning time of each test mixed sample with the burning time of the following standard mixed sample, the standard mixed sample is such that the standard substance (potassium bromate) and cellulose are in a weight ratio of 3:2, 2:3, 3 :7 is mixed.

(risk assessment)

The average burning time of each test mixed sample is classified as "container grade 1" below the burning time of the standard mixed sample of 3:2 by weight ratio of potassium bromate to cellulose, and will exceed the standard of mixing ratio of 3:2. The burning time of the mixed sample and the burning time of the standard mixed sample with a mixing weight ratio of 2:3 are classified as "container level 2", which will exceed the burning time of the standard mixed sample of the mixing weight ratio of 2:3 and The burning time of the standard mixed sample of the mixing weight ratio of 3:7 is classified as "container level 3". The burning time of the standard mixed sample exceeding 3:7 by the weight ratio of potassium bromate to cellulose does not meet the conditions of CLASS 5-Division 5.1 (oxidizing solid).

Further, the particulate composition of the present invention has a low risk in the case of evaluation in the combustion test (ii) and the ball drop sensitivity test. The "combustion test (ii) and the ball drop sensitivity test" refer to tests conducted in the following order.

(combustion test (ii))

The so-called combustion test (ii) refers to the test for classifying the potential hazard of the oxidizing power of the test sample. As a work order, first, the test sample is made into a powdery form and the wood powder is mixed at a mass ratio of 1:1 and 4:1, and the total of the two is 30 g, thereby forming a conical pile. . The nichrome wire heated to 1000 ° C was brought into contact with the base of the stack to confirm whether the test mixed sample was burned, and in the case of combustion, the burning time was measured.

The burning time of the shorter of the burning time of each mixed sample measured in this manner is mixed with the standard sample [the standard substance (potassium perchlorate or potassium bromate) and wood flour The mass ratio is compared to the burning time of 1:1. The burning time of the test mixed sample is set to "Class 1" for the burning time of the standard mixed sample of potassium bromate, and the burning time of the standard mixed sample exceeding potassium bromate is the burning time of the standard mixed sample of potassium perchlorate. The following is set to "Level 2", and the burning time of the standard mixed sample exceeding potassium perchlorate is set to "Level 3".

(falling ball strike sensitivity test)

The so-called falling ball type sensitivity test refers to a test that classifies the sensitivity of the test sample to impact. As a working sequence, first, for the mixture of the standard substance (potassium chlorate or potassium nitrate) and red phosphorus, the steel ball is dropped from a certain height, and the drop height is raised and lowered according to the explosion or non-explosion to obtain a 50% explosion point (to 50 The probability of % is the height of the explosion). For the mixture of the test sample and the red phosphorus, the same test was carried out 10 or 40 times from the respective 50% explosion point to drop the steel ball and the explosion was not evaluated. In the specification of the present application, the case where potassium chlorate is used as a standard substance is referred to as "potassium chlorate method", and the case where potassium nitrate is used as a standard substance is referred to as "potassium nitrate method".

The test of dropping the steel ball from the 50% explosion point by the potassium chlorate method for 10 times, and setting the "explosion" for all 10 times as "level 1". When there are two cases of "explosion" and "no explosion" in 10 tests, 30 tests will be carried out, and the "explosion" will be set to "level 1" for a total of 40 tests in 40 tests. The "explosion" is less than 20 times and is set to "level 2". In the case where all of the first 10 tests were "no explosion", the test using the potassium nitrate method was carried out and evaluated.

In the 10 tests in which the steel ball was dropped from the 50% explosion point by the potassium nitrate method, the case of "explosion" was set to "level 2", and the case of "no explosion" was set to "grade". 3". When there are two cases of "explosion" and "no explosion" in 10 tests, 30 tests will be carried out, and the "explosion" will be set to "level 2" for a total of 40 tests in 40 tests. The case where the "explosion" has not reached 20 times is set to "level 3".

(risk assessment)

The risk of the test specimen is determined based on the results of the combustion test (ii) and the ball drop sensitivity test. Class 1 is classified as "Grade 1 oxidizing solid" in the Burning Test (ii) and Falling Ball Sensitivity Test, and will be Grade 2 in the Burning Test (ii) and the Falling Ball Sensitivity Test. It is classified as "level 2 oxidizing solid", and one of the burning test (ii) or the falling ball type sensitivity test is "level 2" and the other is "level 3". "Sexual solids" will be classified as "non-hazardous" in the "combustion test" (ii) and the ball-type strike sensitivity test.

The classification of the above-mentioned risk assessment means that the greater the number of "levels", the lower the risk of being a dangerous substance, and the condition of meeting the conditions of non-hazardous materials means that even in manufacturing, handling, storage and general There is no safety issue with the same treatment of chemicals.

(glass)

The present invention also relates to a glass containing the above particulate composition as a raw material. In the production of glass, the selection of the raw material to be prepared is very important, and in the case of using cerium nitrate and/or cerium nitrate, the solubility of the raw material is good, and it is also excellent in terms of clarification. The method for producing the glass of the present invention is not particularly limited, and a known method (for example, a melting method) can be used. That is, the glass of the present invention contains glass of cerium, alumina, boric acid, and cerium nitrate and/or cerium nitrate of the present invention, and other essential components, in a specific composition represented by an oxide standard. The raw material is filled in a crucible composed of quartz or platinum. Thereafter, using an electric furnace and gas The melting furnace such as a furnace is heated and melted. After the melting, the glass is homogenized by clarification and stirring as necessary, and then the molten glass is poured into a forming mold and quenched, thereby being formed, and then quenched in a quenching furnace.

Various base plates, structural members, and transmissive optical materials can be obtained by cutting, grinding, and grinding the glass taken out from the cold furnace as needed.

(preservation method)

The invention also relates to a method of preserving cerium nitrate and/or cerium nitrate.

Barium nitrate or barium nitrate has the effect of oxidizing combustibles causing intense combustion or explosion.

When the cerium nitrate or cerium nitrate is stored, by mixing the hydrophobic cerium oxide, the risk of the above-mentioned intense combustion or explosion can be reduced, and it can be treated as a highly safe cerium nitrate and/or cerium nitrate.

The cerium nitrate or cerium nitrate preserved by the preservation method of the present invention can be preferably used as a glass raw material.

Example

Hereinafter, the present invention will be described in further detail based on the examples, and the present invention is not limited to the examples. In the following examples and comparative examples, "%" means "% by mass" unless otherwise specified.

(combustion test)

The combustion test is carried out in accordance with the method of the above-mentioned United Nations recommendations, the combustion test of the test manual (i) or the method of the combustion test (ii).

(falling ball strike sensitivity test)

The falling ball type sensitivity test was carried out according to the above-described falling ball type sensitivity test method.

(Evaluation of particles containing cerium nitrate)

(Example 1)

AEROSIL R972 (surface-treated hydrophobic cerium oxide, hydrophobization degree 35%, specific surface area 110 m ^{2 ) was} added in an amount of 0.5% by mass of the total mass of the particles as the amount of hydrophobic cerium oxide added to 500 kg of cerium nitrate. /g, manufactured by Evonik Industries, Inc., 2.51 kg, which was mixed by a belt type blender to prepare a particulate composition 1. The obtained particulate component 1 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 1.

(Example 2)

The particulate composition 2 was produced in the same manner as in Example 1 except that the amount of addition of AEROSIL R972 was changed to 0.75% by mass of the total mass of the particles. The obtained particulate component 2 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 1.

(Example 3)

The particulate composition 3 was produced in the same manner as in Example 1 except that the amount of addition of AEROSIL R972 was changed to 1.0% by mass of the total mass of the particles. The obtained particulate component 3 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 1.

(Example 4)

In addition to changing the type of hydrophobic cerium oxide to Nipsil SS-30P (surface-treated hydrophobic cerium oxide, hydrophobization degree 60%, specific surface area 125 m ² /g, manufactured by TOSOH SILICA Co., Ltd.) In the same manner as in Example 1, the particulate composition 4 was produced. The obtained particulate component 4 was subjected to a burning test. The results are shown in Table 1.

(Example 5)

In addition to changing the type of hydrophobic cerium oxide to Nipsil SS-50F (surface-treated hydrophobic cerium oxide, hydrophobization degree 60%, specific surface area 82 m ² /g, manufactured by TOSOH SILICA Co., Ltd.) In the same manner as in Example 1, the particulate composition 5 was produced. The obtained particulate component 5 was subjected to a burning test. The results are shown in Table 1.

(Example 6)

The particulate composition 6 was produced in the same manner as in Example 1 except that the type of the hydrophobic cerium oxide was changed to Nipsil SS-30P and the amount of the cerium was changed to 1.0% by mass of the total mass of the particles. The obtained particulate component 6 was subjected to a burning test. The results are shown in Table 1.

(Example 7)

The particulate composition 7 was produced in the same manner as in Example 1 except that the type of the hydrophobic cerium oxide was changed to Nipsil SS-50F and the amount of the cerium was changed to 1.0% by mass of the total mass of the particles. The obtained particulate component 7 was subjected to a first-class combustion test of a dangerous substance. The results are shown in Table 1.

(Comparative Example 1)

Comparative particulate component 1 was produced in the same manner as in Example 1 except that cerium oxide was not used. The obtained comparative particulate component 1 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 2.

(Comparative Example 2)

Comparative particles were prepared in the same manner as in Example 1 except that the type of cerium oxide was changed to AEROSIL 200 (hydrophilic cerium oxide, degree of hydrophobicity: 0%, specific surface area: 200 m ² /g, manufactured by Evonik Industries, Inc.). Composition 2. The obtained comparative particulate component 2 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 2.

(Comparative Example 3)

The same procedure as in Example 1 was carried out except that the type of cerium oxide was changed to Nipsil LP (hydrophilic cerium oxide, degree of hydrophobicity: 0%, specific surface area: 210 m ² /g, manufactured by TOSOH SILICA Co., Ltd.). The particulate composition 3 was compared. The obtained comparative particulate composition 3 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 2.

(Comparative Example 4)

The comparative particulate component 4 was produced in the same manner as in Example 1 except that the type of cerium oxide was changed to Nipsil LP and the amount of the cerium oxide was changed to 3.0% by mass of the total mass of the particles. The obtained comparative particulate component 4 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 2.

(Comparative Example 5)

The type of cerium oxide was changed to MK Silica FINES (high-purity cerium oxide glass material, hydrophobization degree 0%, average particle diameter 40 μm, manufactured by KCM Co., Ltd.), and the amount thereof was changed to 30% of the total mass of the particles. A comparative particulate component 5 was produced in the same manner as in Example 1 except for the mass %. The obtained comparative particulate component 5 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 2.

(Comparative Example 6)

The type of cerium oxide was changed to MK Silica 20/250 (high-purity cerium oxide glass material, hydrophobization degree 0%, average particle diameter 120 μm, manufactured by KCM Co., Ltd.), and the amount of addition was changed to the total mass of the particles. A comparative particulate component 6 was produced in the same manner as in Example 1 except that the amount was 30% by mass. The obtained comparative particulate composition 6 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 2.

From the results of Table 1, it is understood that the particulate compositions of the present invention containing cerium nitrate and hydrophobic cerium oxide (Examples 1 to 7) have low potential risks of oxidizing power in the combustion test. Furthermore, it is known from the falling ball type sensitivity test that the sensitivity to impact is also low. On the other hand, according to the results of Table 2, it was found that the particle composition containing no hydrophobic cerium oxide (Comparative Examples 1 to 6) could not see the effect of eliminating the danger. As described above, according to the above results, the particulate component of the present invention is excellent in terms of elimination of risk and safety.

(Evaluation of particles containing cerium nitrate)

(Example 8)

AEROSIL R972 3.78 kg was added in an amount of 0.75 mass% of the total mass of the particles as the amount of hydrophobic cerium oxide added to 500 kg of cerium nitrate, and mixed by a belt type blender to prepare a particulate composition. 8. The resulting particulate composition 8 was subjected to a falling ball type sensitivity test. The results are shown in Table 3.

(Example 9)

The particulate composition 9 was produced in the same manner as in Example 8 except that the amount of addition of AEROSIL R972 was changed to 1.0% by mass of the total mass of the particles. The obtained particulate component 9 was subjected to a burning test. The results are shown in Table 3.

(Embodiment 10)

The particulate composition 10 was produced in the same manner as in Example 8 except that the amount of addition of AEROSIL R972 was changed to 1.5% by mass of the total mass of the particles. The obtained particulate component 10 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 3.

(Comparative Example 7)

A comparative particle group was prepared in the same manner as in Example 8 except that cerium oxide was not used. Adult 7. The obtained comparative particulate component 7 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 3.

(Comparative Example 8)

A comparative particulate component 8 was produced in the same manner as in Example 8 except that the type of cerium oxide was changed to AEROSIL 200 and the amount of the cerium oxide was changed to 30% by mass of the total mass of the particles. The obtained particulate component 8 was subjected to a burning test and a falling ball type sensitivity test. The results of the risk assessment are shown in Table 3.

Lanthanum nitrate is generally used in the combustion test of the CLASS 5-Division 5.1 (oxidative solids) recommended by the United Nations to meet the conditions of a hazardous substance classified as "container grade 2". According to the results of Table 3, the particulate composition of the present invention containing cerium nitrate and hydrophobic cerium oxide (Examples 8 to 10) inhibits the potential risk of oxidizing power and sensitivity to impact, and can reduce the risk. Excellent in terms of improved safety. The particle composition containing no hydrophobic cerium oxide (Comparative Examples 7 and 8) did not show the effect of reducing the risk.

A glass containing a particulate component containing cerium nitrate and/or cerium nitrate and hydrophobic cerium oxide and having a reduced risk as a raw material is produced without any safety even if it is produced by a manufacturing process using a general chemical as a raw material. problem. Further, a glass containing a particulate composition containing cerium nitrate and/or cerium nitrate and hydrophobic cerium oxide as a raw material can be obtained in a quality comparable to glass containing cerium nitrate and/or cerium nitrate as a raw material. The glass of difference.

(Example of glass production)

The prepared raw materials of Table 4 (the composition values are parts by weight) were thoroughly mixed, added to a platinum crucible, and covered with a platinum lid. Put the crucible into an electric furnace and heat it to about 1500~1680 °C, melt, stir, homogenize, clarify, and then flow into the mold to solidify the glass, and then move to an electric furnace that is heated to the vicinity of the cold point of the glass. In the middle, Xu is cooled to room temperature, whereby a glass composition can be produced.

Claims (9)

A particulate composition comprising cerium nitrate and/or cerium nitrate and hydrophobic cerium oxide. For example, the particulate composition of Patent Application No. 1 is based on the United Nations Recommendation CLASS 5-Division 5.1 (Recommendation on the TRANSPORT OF DANGEROUS GOODS-Manual of Tests and Criteria-Third revised edition) according to the UN Recommendation. The flammable solid) does not meet the conditions of the dangerous substance in the burning test. The particulate composition according to claim 1 or 2, which contains the cerium nitrate or cerium nitrate in an amount of 95.0 to 99.8 mass%. The particulate composition according to any one of claims 1 to 3, wherein the particulate composition can be used as a glass raw material. The particulate composition according to any one of claims 1 to 4, wherein the hydrophobic cerium oxide is contained in an amount of 0.1 to 3.0% by mass (wherein the total mass of the particulate composition is 100% by mass). The particulate composition according to any one of claims 1 to 5, wherein the hydrophobic cerium oxide has a BET specific surface area of 50 to 400 m ² /g. A method for producing a particulate composition according to any one of claims 1 to 6, which comprises the step of mixing cerium nitrate and/or cerium nitrate with hydrophobic cerium oxide. A glass produced by the particulate composition of any one of claims 1 to 6. A method for preserving cerium nitrate and/or cerium nitrate mixed with hydrophobic cerium oxide.