JP4088930B2 - Foamed glass manufacturing method and foamed glass - Google Patents

Description

In the present invention, arsenic (As) and other heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) do not elute into the environment. The present invention relates to a glass manufacturing method and foamed glass.

  Recently, foamed glass has been used as an artificial lightweight aggregate, an insulation material for buildings, a soundproofing material, and the like.

As a method for producing such foamed glass, there has been proposed a method for producing foamed glass by pulverizing waste glass discharged from a home, melting and foaming it.
However, when the elution test was performed on the foamed glass thus produced, it was found that arsenic (As) was eluted.

In addition, the present inventors also conducted a dissolution test on foamed glass with respect to heavy metals other than arsenic (As) (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.). As a result, it was found that these heavy metals were eluted.

If arsenic (As) or other heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) elute from the foam glass into the environment, it will contaminate the soil and water. There is a risk of connection.

The present invention has been made to solve the above-described problems, and includes arsenic (As) and other heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium. (Se) etc.) is intended to provide a foamed glass that is not eluted into the environment.

The method for producing foamed glass according to claim 1 is the following: ground glass, foamed glass, calcium hydroxide and / or calcium oxide on the surface of the porous pores of the foamed glass and in the vitreous part In order to prevent elution of heavy metals from the foamed glass produced by melting and foaming a mixture containing a quantity of slaked lime in anticipation of the amount of particles remaining at a temperature of 700 ° C. to 1100 ° C. The calcium hydroxide particles and / or the calcium oxide particles were dispersed on the surface of the porous pores of the foamed glass to be produced or in the vitreous portion .
The method for producing foamed glass according to claim 2 is the method for producing foamed glass according to claim 1, and after making the foamed glass, in the surface of the porous pores of the foamed glass, or in the vitreous part, The amount of slaked lime added in anticipation of the amount of calcium hydroxide and / or calcium oxide particles remaining is 0.5 wt% or more and 10 wt% or less with respect to the crushed glass.

  Here, the term “calcium hydroxide and / or calcium oxide” used in the present specification is used in the sense of including calcium hydroxide, calcium oxide, or both calcium hydroxide and calcium oxide.

  In addition, calcium hydroxide and / or calcium oxide dispersed in the produced foamed glass is derived from a part of the slaked lime added to the raw material.

The method of manufacturing foam glass according to claim 1 is necessary, SiC, CaCO _3, may be added a foaming agent, such as shells.

The method for producing foamed glass according to claim 3 is selected from the group of pulverized glass and calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, ferric sulfate and activated carbon. A mixture containing at least one component particle is melted and foamed at a temperature of 700 ° C. or higher and 1100 ° C. or lower, more preferably 850 ° C. or higher and 1000 ° C. or lower, and elution of heavy metals from the produced foamed glass is prevented. for, calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, and the particles of at least one component selected from the group of ferric and activated carbon sulfate, porous foam glass produced It was made to disperse | distribute in the surface of a quality pore part, or a vitreous part .

The method of manufacturing foam glass according to claim 2, if necessary, SiC, CaCO _3, may be added a foaming agent, such as shells.

The manufacturing method of the foamed glass of Claim 4 is a borosilicate glass and / or soda-lime glass of the glass of the manufacturing method of the foamed glass in any one of Claims 1-3.

The manufacturing method of the foamed glass of Claim 5 WHEREIN: Glass of the manufacturing method of the foamed glass in any one of Claims 1-4 is waste glass.

The foamed glass according to claim 6 is composed of calcium hydroxide particles for preventing elution of heavy metals from the produced foamed glass on the surface of the porous pores of the foamed glass or in the vitreous part. Calcium oxide particles are dispersed.

The foamed glass according to claim 7 is a calcium hydroxide or calcium oxide for preventing elution of heavy metals from the foamed glass produced on the surface of the porous pores of the foamed glass or in the vitreous part. Foam glass in which particles of at least one component selected from the group consisting of calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, ferric sulfate and activated carbon are dispersed.

  In addition, if shellfish (waste) is used as the calcium carbonate source or gypsum (waste) is used as the calcium sulfate source, effective use (recycling) of waste glass, shell (waste) gypsum (waste) Can be planned.

  Moreover, if scrap iron (ferric oxide in scrap iron) is used as a ferric oxide source, waste glass and scrap iron (ferric oxide in scrap iron) can be effectively used (recycled).

In the manufacturing method of the foam glass of Claim 1 or Claim 2 , slaked lime (calcium hydroxide) is used.

  Although this slaked lime has a function as a foaming agent, in this method for producing foamed glass, a portion of the slaked lime contained in the mixture in the produced foamed glass is calcium hydroxide and / or oxidized. It is in a dispersed state as calcium.

  In the foamed glass produced by this method for producing foamed glass, calcium hydroxide and / or calcium oxide is in a dispersed state, so even if arsenic (As) is contained in the produced foamed glass. The action of calcium hydroxide and / or calcium oxide prevents arsenic (As) from elution from the foam glass into the environment.

  Further, in this foamed glass, since calcium hydroxide and / or calcium oxide is dispersed in the inside thereof, the effect is sustained as compared with the case where slaked lime is applied or adhered only on the surface. And the elution of arsenic (As) from the foamed glass into the environment is prevented.

The method for producing foamed glass according to claim 3 uses at least one component selected from the group consisting of calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, ferric sulfate and activated carbon. and, and, in the foamed glass produced by the production method of foam glass, and the surface of the pores of the porous foam glass, vitreous portion, hydroxide calcium-calcium oxide, calcium phosphate, calcium sulfate, carbonate Since particles of at least one component selected from the group of calcium, ferric oxide, ferric sulfate and activated carbon are dispersed, heavy metals (arsenic (As), cadmium (Cd), lead (Pb), 6-valent chromium ^{(Cr 6+),} also contain selenium (Se), etc.), the hydroxide calcium- Calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, and some particles of at least one component selected from the group of ferric and activated carbon sulfate, particles of a particle and / or calcium oxide in calcium hydroxide This prevents the elution of heavy metals (arsenic (As), cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.)) from the foamed glass into the environment.

Further, in this foamed glass, at least one component selected from the group consisting of calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, ferric sulfate and activated carbon is dispersed in the foamed glass. Therefore, a part of at least one component selected from the group consisting of calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, ferric sulfate and activated carbon is applied only to the surface. Or the effect that the effect lasts compared to the attached ones, and heavy metals from the foam glass to the environment (arsenic (As), cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ) Elution of selenium (Se) and the like).

Since the manufacturing method of the foam glass of Claim 4 uses the borosilicate glass and / or soda-lime glass which are put out as a waste material from a household as a raw material, effective utilization (recycling) of a borosilicate glass and / or soda-lime glass ) And excellent safety, it is possible to supply artificial lightweight aggregates, heat insulating materials for construction, soundproofing materials and other foamed glass to the market.

In the manufacturing method of the foam glass of Claim 5 , waste glass is used as raw material glass.

  In this foam glass manufacturing method, since foam glass is manufactured from waste glass, it is an artificial light weight excellent in effective use (recycling) and safety of waste glass discharged as household waste or industrial waste. It will be possible to supply aggregate, architectural insulation, soundproofing materials and other foam glass to the market.

The foamed glass according to claim 6 is in a state where calcium hydroxide particles and / or calcium oxide particles are dispersed in the surface of the porous pores of the foamed glass foamed glass or in the vitreous portion . .

  Accordingly, even if arsenic (As) is contained in the raw material of the foam glass, the elution of arsenic (As) from the foam glass into the environment is prevented by the action of the calcium hydroxide and / or calcium oxide. .

  Moreover, in this foam glass, since the slaked lime is dispersed in the inside, the effect is sustained only on the surface as compared with the case where the slaked lime is applied or adhered, and from the foam glass to the environment. Elution of arsenic (As).

The foamed glass according to claim 7 includes calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, and sulfuric acid in the surface of the porous pores of the foamed glass and in the vitreous portion . Particles of at least one component selected from the group of ferric iron and activated carbon and calcium hydroxide particles and / or calcium oxide particles are dispersed.

Therefore, even if heavy metals (arsenic (As), cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) are contained in the raw material of the foam glass, hydroxylation is performed. At least one component selected from the group consisting of calcium, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, ferric sulfate and activated carbon, and from the foam glass by the action of calcium hydroxide and / or calcium oxide Elution of heavy metals (arsenic (As), cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) into the environment is prevented.

  Hereinafter, the manufacturing method of foam glass and foam glass concerning the present invention are explained, referring to drawings.

(About foamed glass that prevents elution of arsenic (As))
FIG. 1 is a schematic view schematically showing a foam glass according to the present invention.

  The foam glass 1 has a porous hole 2. Moreover, it has the particle | grains 3 ... of calcium hydroxide and / or calcium oxide in the surface of the hole part 2, or in a vitreous part.

  Next, the manufacturing method of this foam glass 1 is demonstrated.

  FIG. 2 is a process diagram schematically illustrating the manufacturing process of the foam glass 1.

  When manufacturing the foam glass 1, for example, waste glass (for example, borosilicate glass and / or soda lime glass) is used as a raw material (see step S1).

  Next, the raw glass (waste glass) is roughly crushed (see step S2) and then pulverized (see step S3).

  Next, the particle size is selected, for example, those having a particle size of 500 μm or less are sent to the next process, and those having a particle size exceeding 500 μm are sent to the fine pulverization process (see step S3).

  Next, slaked lime is added to the glass powder obtained as described above.

  Here, slaked lime has a function as a foaming agent. In the present invention, calcium hydroxide and / or calcium oxide particles derived from a part of slaked lime remain in the foamed glass even after the foamed glass is formed. Add slaked lime to the glass powder in anticipation of the correct amount.

  Here, the amount of slaked lime added is preferably in the range of 0.5 wt% to 10 wt%. If the amount of slaked lime added is less than 0.5% by weight, the ability to prevent elution of arsenic (As) from the foamed glass into the environment will be insufficient. On the other hand, even if an amount exceeding 10% by weight of slaked lime is added, improvement in the ability to prevent arsenic (As) from elution from the foamed glass into the environment is not observed.

  Moreover, based on experiment, the addition amount of slaked lime is sufficient even in the range of 0.5 wt% or more and 5 wt% or less. Moreover, based on the experiment, even when an amount exceeding 5% by weight of slaked lime was added, improvement in the ability to prevent arsenic (As) from evaporating into the environment was not observed (for the above, (See FIG. 3).

Further, if necessary, as a blowing agent, for example, SiC, CaCO _3, may be added a foaming agent, such as shells.

  Moreover, it is preferable that the slaked lime to add exists in the range of 0.5 micrometer or more and 50 micrometers or less.

  Next, glass powder and slaked lime are mixed until uniform.

  When a foaming agent is further added to the glass powder and slaked lime as necessary, they are mixed until uniform (see step S4 for the above).

  Next, foamed glass is manufactured by foaming the mixture prepared in the above process with reference to firing (see step S5).

  At this time, the firing temperature is a temperature in the range of 700 ° C. or higher and 1100 ° C. or lower (more preferably, a temperature in the range of 850 ° C. or higher and 1000 ° C. or lower). In the state where the calcium particles are present, the baking process is finished, and the product is cooled (see step S6), and the product (foamed glass in which calcium hydroxide and / or calcium oxide particles are dispersed). Is removed from the furnace.

  FIG. 3 is a graph showing the correlation between the arsenic (As) elution amount of foamed glass and the added amount of slaked lime.

  In FIG. 3, each of a to i indicates the produced foam glass. In FIG. 3, the production conditions of the produced foam glass corresponding to each of a to i (of the type and use of the foaming agent). Presence or absence, firing temperature).

  When the elution amount of arsenic (As) is 0.01 mg / liter as a reference value, it varies depending on the glass raw material used. However, if the addition amount of slaked lime is 0.5% by weight or more, it is eluted from the foam glass. It has become clear that arsenic (As) can be reduced below the reference value.

  In this foamed glass 1, calcium hydroxide and / or calcium oxide particles 3 are in a dispersed state. Therefore, even if arsenic (As) is contained in the produced foamed glass, this Arsenic (As) elution from the foam glass 1 into the environment is prevented by the action of calcium hydroxide and / or calcium oxide.

  Moreover, in this foamed glass 1, since the particle | grains 3 ... of calcium hydroxide and / or calcium oxide are also disperse | distributed also in the inside, to what the slaked lime has apply | coated or adhered only on the surface. The effect that the effect lasts in comparison and the elution of arsenic (As) from the foamed glass into the environment can be prevented even when pulverized.

  Moreover, since the manufacturing method of the foam glass shown in this example uses waste glass (borosilicate glass and / or soda lime glass) discharged from a home as a raw material, waste glass (borosilicate glass and / or soda lime glass) ) Can be supplied to the market for artificial lightweight aggregates, heat insulating materials for construction, soundproofing materials and other foamed glass that are excellent in effective use (recycling) and safety.

(About foamed glass that prevents elution of heavy metals)
SiC is used as a foaming agent, and calcium hydroxide (Ca (OH) ₂ ), calcium phosphate (CaPO ₄ ), calcium sulfate (CaSO ₄ ), calcium carbonate (CaCO ₃ ), ferric oxide (Fe ₂ ) as additives. Except for using O ₃ ), ferric sulfate (Fe ₂ (SO ₄ ) ₃ ), or activated carbon, the additive (in some cases, the additive and its oxidation may be used in the same manner as the foamed glass manufacturing method shown in FIG. Various foamed glass in which the product or oxide of the additive was dispersed in the foamed glass was prepared.

  The foaming agent (SiC) was 0.5%.

  Moreover, it is preferable to make the addition amount of an additive into the range of 0.5 weight% or more and 10 weight% or less. This is because when the amount added is less than 0.5% by weight, the ability to prevent elution of heavy metals from the foamed glass into the environment becomes insufficient. On the other hand, even if the additive is added in an amount exceeding 10% by weight, the ability to prevent elution of heavy metals from the foamed glass into the environment cannot be seen.

In addition to using SiC as a foaming agent, a foaming agent such as CaCO _{3 or} a shell may be added.

  First, glass powder, a foaming agent, and various additives are mixed until uniform.

  Next, foamed glass is manufactured by baking and foaming the mixture prepared in the above process.

  At this time, the firing temperature is set to a temperature in the range of 700 ° C. to 1100 ° C. (more preferably, a temperature in the range of 850 ° C. to 1000 ° C.), and additive particles are present in the produced foamed glass. In this state, the firing step is completed, the product is cooled, and the product (foamed glass in which the additive particles are dispersed) is taken out of the furnace.

Next, the obtained foamed glass was subjected to the Environmental Agency Notification No. 46 dissolution test (soil environmental standards).
Since cadmium is hardly contained in the glass from the beginning, it is difficult to elute even if it is contained. Thus, the dissolution test results are as shown in FIG. (The same applies to the results of the cadmium (Cd) dissolution test).
FIG. 4 shows cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), foam glass using calcium hydroxide (Ca (OH) ₂ ) as additives. It is a graph which shows the correlation with the elution amount of arsenic (As) and selenium (Se), and the addition amount of calcium hydroxide (Ca (OH) ₂ ).

As is apparent from the results of FIG. 4, the foamed glass produced by mixing 0.5 wt% to 10 wt% of calcium hydroxide (Ca (OH) ₂ ) in waste glass is arsenic (As). Almost no elution was observed.

Further, in the foamed glass produced by mixing calcium hydroxide (Ca (OH) ₂ ) in an amount of 0.5 wt% or more and 2 wt% or less in the waste glass, almost no elution of lead (Pb) was observed.

As is clear from FIG. 4, calcium hydroxide (Ca (OH) ₂ ) added to the waste glass is particularly effective in preventing arsenic (As) elution from the foamed glass.

FIG. 5 shows cadmium (Cd), total chromium (T—Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As), and foamed glass using calcium phosphate (CaPO ₄ ) as additives. and the amount of elution of selenium (Se), which is a graph showing the correlation between the amount of calcium phosphate (CaPO _4).

As is apparent from the results of FIG. 5, the foamed glass produced by mixing calcium phosphate (CaPO ₄ ) in an amount of 0.5 wt% or more and 10 wt% or less in the waste glass shows almost no elution of lead (Pb). There wasn't.

Further, it was found that the lead (Pb) elution preventing effect appears in a generally positive relationship to increase the amount of calcium phosphate (CaPO ₄ ) added in the range of 0.5 wt% to 10 wt%.

In addition, in the foamed glass prepared by mixing calcium phosphate (CaPO ₄ ) in an amount of 0.5 wt% to 10 wt% in the waste glass, almost no elution of hexavalent chromium (Cr ⁶⁺ ) was observed.

In addition, in the foamed glass produced by mixing 0.5 wt% or more and 10 wt% or less of calcium phosphate (CaPO ₄ ) in the waste glass, almost no selenium (Se) was eluted.

Further, as is apparent from FIG. 5, calcium phosphate (CaPO ₄ ) added to waste glass particularly prevents elution of lead (Pb), hexavalent chromium (Cr ⁶⁺ ) and selenium (Se) from the foam glass. It is effective to do.

Further, as is apparent from FIG. 5, the calcium phosphate (CaPO ₄ ) added to the waste glass is generally positive when the calcium phosphate (CaPO ₄ ) is added in the range of 0.5 wt% to 10 wt%. Therefore, elution of arsenic (As) can be suppressed.

FIG. 6 shows cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As) in foamed glass using calcium sulfate (CaSO ₄ ) as additives. , the elution amount of selenium (Se), which is a graph showing the correlation between the amount of calcium sulfate (CaSO _4).

When calcium sulfate (CaSO ₄ ) is used as an additive, calcium sulfate (CaSO ₄ ) and / or calcium oxide (CaO) is dispersed in the produced foamed glass.

As is apparent from the results of FIG. 6, the foamed glass prepared by mixing calcium sulfate (CaSO ₄ ) in the amount of 0.5 wt% to 10 wt% in the waste glass shows almost no elution of lead (Pb). I couldn't. Further, it was found that the lead (Pb) elution preventing effect appears in a generally positive relationship to increase the addition amount of calcium sulfate (CaSO ₄ ) in the range of 0.5 to 10 parts by weight. .

In addition, in the foamed glass prepared by mixing calcium sulfate (CaSO ₄ ) in an amount of 0.5 wt% to 10 wt% in the waste glass, almost no elution of hexavalent chromium (Cr ⁶⁺ ) was observed.

Moreover, the foamed glass produced by mixing calcium sulfate (CaSO ₄ ) in an amount of 0.5 wt% or more and 10 wt% or less in waste glass has an elution concentration (mg / liter) of selenium (Se) of 0.01 ( mg / liter) or less.

Further, as is apparent from FIG. 6, calcium sulfate (CaSO ₄ ) added to the waste glass is particularly effective in elution of lead (Pb), hexavalent chromium (Cr ⁶⁺ ), and selenium (Se) from the foamed glass. It is effective to prevent.

FIG. 7 shows cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As) in foamed glass using calcium carbonate (CaCO ₃ ) as additives. is a graph showing the elution amount of selenium (Se), the correlation between the addition amount of calcium carbonate (CaCO _3).

When calcium carbonate (CaCO ₃ ) is used as an additive, calcium carbonate (CaCO ₃ ) and / or calcium oxide (CaO) is dispersed in the produced foamed glass.

If, for example, a shell (waste) is used as the calcium carbonate (CaCO ₃ ) source, the waste glass and shell (waste) can be effectively used.

As is clear from the results of FIG. 7, the foamed glass produced by mixing 1% by weight or more and 10% by weight or less of calcium carbonate (CaCO ₃ ) in the waste glass shows almost no elution of lead (Pb). It was.

In addition, the foamed glass produced by mixing 1% by weight or more and 6% by weight or less of calcium carbonate (CaCO ₃ ) in the waste glass has an elution amount (mg / liter) of hexavalent chromium (Cr ⁶⁺ ) of 0. It was found that the concentration could be reduced to 01 mg / liter or less.

Moreover, the foamed glass produced by mixing 0.5 wt% or more and 10 wt% or less of calcium carbonate (CaCO ₃ ) into the waste glass has an elution amount (mg / liter) of selenium (Se) of 0.01 mg. It was found that it can be reduced to 1 / liter or less.

Further, as is apparent from FIG. 7, calcium carbonate (CaCO ₃ ) added to the waste glass is particularly effective in elution of lead (Pb), hexavalent chromium (Cr ⁶⁺ ), and selenium (Se) from the foamed glass. It is effective to prevent.

FIG. 8 shows cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ) in foamed glass using ferric oxide (Fe ₂ O ₃ ) as additives. arsenic (as), and elution amount of selenium (Se), which is a graph showing the correlation between the added amount of ferric oxide _(Fe 2 _{O 3).}

If, for example, scrap iron (ferric oxide in scrap iron) is used as the ferric oxide (Fe ₂ O ₃ ) source, waste glass and scrap iron can be effectively used.

As is clear from the results of FIG. 8, the foamed glass produced by mixing ferric oxide (Fe ₂ O ₃ ) in an amount of 0.5 wt% to 10 wt% in the waste glass is made of lead (Pb). Almost no elution was observed.

Moreover, the foamed glass produced by mixing ferric oxide (Fe ₂ O ₃ ) in the waste glass by 0.5 wt% or more and 10 wt% or less may be effective in preventing arsenic (As) elution. understood.

Moreover, the foamed glass produced by mixing ferric oxide (Fe ₂ O ₃ ) in an amount of 0.5% by weight or more and 10% by weight or less in waste glass is effective in preventing the elution of all chromium (T-Cr). It turns out that there is.

Moreover, almost no elution of hexavalent chromium (Cr ⁶⁺ ) is observed in the foamed glass prepared by mixing ferric oxide (Fe ₂ O ₃ ) in an amount of 0.5 wt% to 10 wt% in the waste glass. There wasn't.

Moreover, the foamed glass produced by mixing ferric oxide (Fe ₂ O ₃ ) in the waste glass with 0.5 wt% or more and 10 wt% or less has an elution amount (mg / liter) of selenium (Se). And 0.01 mg / liter or less.

Further, as is apparent from FIG. 8, ferric oxide (Fe ₂ O ₃ ) added to the waste glass is, in particular, lead (Pb), arsenic (As), total chromium (T—Cr) from the foamed glass. ), Hexavalent chromium (Cr ⁶⁺ ), and selenium (Se).

FIG. 9 shows cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr) in foamed glass using ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) as additives. ⁶⁺ ), arsenic (As), and selenium (Se), and a graph showing the correlation between the amount of ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) added.

As is clear from the results of FIG. 9, the foamed glass produced by mixing ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) in the waste glass with 1.5 wt% or more and 10 wt% or less is composed of lead ( Almost no elution of Pb) was observed.

In addition, the foamed glass produced by mixing ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) in the waste glass by 0.5 wt% or more and 10 wt% or less is effective in preventing elution of arsenic (As). It turns out that there is.

In addition, the foamed glass produced by mixing ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) in an amount of 0.5 wt% or more and 10 wt% or less in waste glass prevents total chromium (T-Cr) from eluting. It was found to be effective.

In addition, the foamed glass produced by mixing ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) in an amount of 0.5 wt% or more and 10 wt% or less in the waste glass ^exhibits elution of hexavalent chromium (Cr ⁶⁺ ). It was hardly seen.

Further, as is apparent from FIG. 9, ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) added to the waste glass is particularly composed of lead (Pb), arsenic (As), total chromium ( T-Cr) and hexavalent chromium (Cr ⁶⁺ ) are effective in preventing elution.

FIG. 10 shows cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As), and selenium (Se) in foamed glass using activated carbon as additives. It is a graph which shows the correlation with the elution amount of and the addition amount of activated carbon.

  As is clear from the results of FIG. 10, the foamed glass produced by mixing activated carbon with 0.5 wt% or more and 10 wt% or less in the waste glass showed almost no elution of lead (Pb).

  Further, it was found that the lead (Pb) elution preventing effect appears in a generally positive relationship to increase the addition amount of activated carbon in the range of 0.5 wt% to 10 wt%.

In addition, the foamed glass produced by mixing 0.5% by weight or more and 10% by weight or less of activated carbon into waste glass has an elution amount (mg / liter) of hexavalent chromium (Cr ⁶⁺ ) of 0.05 mg / liter. It turns out that we can:

  In addition, the foamed glass produced by mixing 0.5% by weight or more and 10% by weight or less of activated carbon with waste glass makes the elution amount (mg / liter) of selenium (Se) 0.01 mg / liter or less. It turns out that you can.

As is clear from FIG. 10, the activated carbon added to the waste glass is particularly effective in preventing elution of lead (Pb), selenium (Se), and hexavalent chromium (Cr ⁶⁺ ) from the foam glass. There is.

As is clear from the results of FIGS. 4 to 10, the above-described foamed glass suppresses elution of heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.). In the foamed glass to be produced, heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), Even if selenium (Se) is included, heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) are prevented from being eluted.

In addition, in these foamed glass, based on the Environmental Agency Notification No. 46 dissolution test (soil environmental standards), cadmium (Cd) 0.01 mg / liter or less, lead (Pb) 0.01 mg / liter or less, Hexavalent chromium (Cr ⁶⁺ ) is 0.05 mg / liter or less and selenium (Se) is 0.01 mg / liter or less. On the other hand, as is clear from the results of FIGS. Elution of categoricals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) is prevented or prevented.

Further, in these foamed glass, since the additive and / or oxide particles thereof are dispersed in the inside thereof, compared to the case where the additive is applied or adhered only to the surface. Even if it is used after pulverization, heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) from foamed glass to the environment Elution is prevented.

  Moreover, since the manufacturing method of the foam glass shown in this example uses waste glass (borosilicate glass and / or soda lime glass) discharged from a home as a raw material, waste glass (borosilicate glass and / or soda lime glass) ) Can be supplied to the market for artificial lightweight aggregates, heat insulating materials for construction, soundproofing materials and other foamed glass that are excellent in effective use (recycling) and safety.

Foam without leaching into the environment of arsenic (As) and other heavy metals (cadmium (Cd), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), selenium (Se), etc.) It is possible to provide artificial light weight aggregate made of glass, heat insulating material for construction, soundproofing material, etc. to the market.

It is a schematic diagram which shows schematically the foam glass which concerns on this invention. It is process drawing which illustrates schematically the manufacturing process of the foam glass shown in FIG. It is a graph which shows the correlation with the arsenic (As) elution amount of the foam glass which concerns on this invention, and the addition amount of slaked lime. Foamed glass cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As) using calcium hydroxide (Ca (OH) ₂ ) as additives It is a graph which shows the correlation with the elution amount of selenium (Se), and the addition amount of calcium hydroxide (Ca (OH) ₂ ). Foamed glass cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As), selenium (Se) using calcium phosphate (CaPO ₄ ) as additives and elution is a graph showing the correlation between the amount of calcium phosphate (CaPO _4). As additives, cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As), selenium (Se) in foamed glass using calcium sulfate (CaSO ₄ ) ) And the addition amount of calcium sulfate (CaSO ₄ ). Foamed glass cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As), selenium (Se) using calcium carbonate (CaCO ₃ ) as additives ) And the added amount of calcium carbonate (CaCO ₃ ). Foamed glass cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As) using ferric oxide (Fe ₂ O ₃ ) as additives is a graph showing the elution amount of selenium (Se), the correlation between the added amount of ferric oxide _(Fe 2 _{O 3).} As additives, cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic in foamed glass using ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) (as), and elution amount of selenium (Se), which is a graph showing the correlation between the amount of ferric sulfate _{(Fe 2 (SO 4) 3} ). As additives, elution amounts of cadmium (Cd), total chromium (T-Cr), lead (Pb), hexavalent chromium (Cr ⁶⁺ ), arsenic (As), and selenium (Se) in foamed glass using activated carbon It is a graph which shows the correlation with the addition amount of activated carbon.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foamed glass 2 Hole 3 Calcium hydroxide and / or calcium oxide particles

Claims (7)

An amount that allows for the amount of calcium hydroxide particles and / or calcium oxide particles to remain on the surface of the porous pores of the foamed glass and in the vitreous portion after the glass is crushed and foamed glass of a mixture containing slaked lime is melted and foamed at temperatures below 1100 ° C. 700 ° C. or higher, and, for preventing the elution of heavy metals from the foam glass to be produced, the particles and / or calcium oxide in calcium hydroxide A method for producing foamed glass, wherein the particles are dispersed in the surface of the porous pores of the produced foamed glass or in the vitreous part . The amount of slaked lime added in anticipation of the amount of calcium hydroxide and / or calcium oxide particles remaining in the surface of the porous pores of the foam glass and in the vitreous portion after the foam glass is formed. The method for producing foamed glass according to claim 1, wherein the amount of the crushed glass is 0.5 wt% or more and 10 wt% or less. After pulverized glass and foamed glass, calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, sulfuric acid on the surface of the porous pores of the foamed glass and in the vitreous part An amount of calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, sulfuric acid fermented in such an amount that particles of at least one component selected from the group of ferric iron and activated carbon remain. To melt and foam a mixture containing particles of at least one component selected from the group of ferric iron and activated carbon at a temperature of 700 ° C. to 1100 ° C. and prevent elution of heavy metals from the foamed glass produced of calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, ferric oxide, sulfate At least one component of the particles, and the surface of the pores of the porous foam glass produced was so dispersed glassy portion, the method of manufacturing a sparkling glass selected from the group of ferric and activated carbon. The manufacturing method of the foamed glass in any one of Claims 1-3 whose said glass is borosilicate glass and / or soda-lime glass. The manufacturing method of the foam glass in any one of Claims 1-4 whose said glass is waste glass. A state where calcium hydroxide particles and / or calcium oxide particles are dispersed in the surface of the porous pores of the foam glass or in the vitreous portion to prevent elution of heavy metals from the produced foam glass. Foamed glass. Calcium hydroxide, calcium oxide, calcium phosphate, calcium sulfate, calcium carbonate, oxidation to prevent elution of heavy metals from the foam glass produced on the surface of the porous pores of the foam glass and in the vitreous part Foamed glass in which particles of at least one component selected from the group of ferric, ferric sulfate and activated carbon are dispersed.

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