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US 2013/0092057 A1Published application
Treatment Method and Treatment Apparatus for Converting Chlorine-Containing Waste into Raw Material for Cement
AssigneeSumitomo Osaka Cement Co., Ltd.
InventorsMasayoshi Konishi, Taisuke Araki, Takako Morikawa
Life of this patent
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Abstract
In the treatment method for converting chlorine-containing waste into raw material for cement, fly ash and desalinated dust are treated, harmful substances such as selenium or heavy metals are removed from the chlorine-containing waste which is the fly ash or desalinated dust by a polymer flocculant or a chelating agent, or by a reducing agent, a polymer flocculant, and electrolytic treatment, and solid components that are generated during the treatment is used as the raw material for cement.
Claims19
A treatment method for converting chlorine-containing waste into a raw material for cement comprising:
- fluidizing the waste (D) by adding water to chlorine-containing fly-ash waste (D) and conducting solid-liquid separation by filtering (2, 22) slurry (S1) in which the chlorine is dissolved (1), using obtained solid cake C2 as the raw material for cement, precipitating (11) heavy metals by adjusting pH of filtrate F2 to 9 to 10 and adding a reducing agent, adding a polymer flocculant (12) to slurry S11 containing the heavy metal precipitates, settling flock by agglomerating the heavy metals, conducting solid-liquid separation (15) by filtering the flock, using obtained solid cake C15 as the raw material for cement, circulating filtrate F15 in the precipitation (11) treatment of the heavy metals, adding (13) a chelating agent to supernatant F12 after separating the settled flock, conducting solid-liquid separation by filtering (14) slurry S13 in which a chelate of the heavy metals is formed, circulating obtained solid components M14 in the polymer flocculant treatment (12), and discharging filtrate F14;
- fluidizing the waste by adding water to the chlorine-containing desalinated dust waste (D), conducting solid-liquid separation by filtering (22) slurry S21 in which the chlorine is dissolved (21), using obtained solid cake C22 as the raw material for cement, precipitating and settling (24) selenium by adjusting pH of filtrate F22 to 5 to 6 and adding (23) iron powder or ferrous chloride, conducting solid-liquid separation (27) by filtering the precipitates, using obtained solid cake C27 as the raw material for cement, precipitating (25) heavy metals by adjusting pH of supernatant F24 after separating the settled selenium to 9 to 10 and adding a reducing agent, adding a polymer flocculant (26) to slurry S25 containing the heavy metal precipitates, settling flock by agglomerating the heavy metals, conducting solid-liquid separation (27) by filtering the flock, using the obtained solid cake C27 as the raw material for cement, circulating filtrate F27 in the precipitating (25) treatment of the heavy metals, precipitating metallic oxide by applying direct current to supernatant F26 after separating the flock and electrolyzing (28), conducting solid-liquid separation by filtering (29) slurry S28 containing the metallic oxide, circulating solid components M29 in the polymer flocculant treatment, and discharging filtrate F29;
- and
- conducting the treatment similar to the chlorine containing desalinated dust treatment to the filtrate F2 along with the supernatant F24 after separating the selenium.
1 more element
A treatment apparatus for converting chlorine-containing waste into a raw material for cement comprising:
- a dissolving vessel (1) in which water is added to chlorine-containing fly-ash waste (D), the waste is fluidized, and the chlorine is dissolved, a filtering device (2) in which a solid cake C2 that is obtained by filtering slurry S1 from the dissolving vessel (1) and conducting solid-liquid separation is used as the raw material for cement, a reaction vessel (11) in which pH of filtrate F2 from the filtering device (2) is adjusted to 9 to 10, a reducing agent is added, and heavy metals are precipitated, a flocculate vessel (12) in which a polymer flocculant is added to slurry S11 containing the heavy metal precipitates from the reaction vessel (11), the heavy metals are agglomerated and flock is settled, a filtering device (15) in which the flock is filtered, a solid cake C15 that is obtained by conducted solid-liquid separation is used as the raw material for cement, and filtrate F15 is circulated in the reaction vessel (11), a chelating vessel (13) in which a chelate of the heavy metals is formed by adding a chelating agent to supernatant F12 from the flocculate vessel (12), and a filtering device (14) in which slurry S13 from the chelating vessel (13) is filtered, solid-liquid separation is conducted, solid components M14 are circulated in the flocculate vessel (12), and filtrate 14 is discharged;
- a dissolving vessel (21) in which water is added to chlorine-containing desalinated dust waste (D), the waste is fluidized, and the chlorine is dissolved, a filtering device (22) in which a solid cake C22 that is obtained by filtering slurry S21 from the dissolving vessel (21) and conducting solid-liquid separation is used as the raw material for cement, a reaction vessel (23) in which pH of filtrate F22 from the filtering device (22) is adjusted to 5 to 6, iron powder or ferrous chloride is added (23), and selenium is precipitated, a settling vessel (24) in which selenium is settled from slurry 23 containing the selenium that is precipitated from the reaction vessel (23), a filtering device (27) in which a solid cake C27 that is obtained by filtering the precipitates and conducting the solid-liquid separation is used as the raw material for cement, a reaction vessel (25) in which pH of supernatant F24 from the settling vessel (24) is adjusted to 9 to 10, a reducing agent is added, and heavy metals are precipitated, a flocculate vessel (26) in which a polymer flocculant is added to slurry S25 containing the heavy metal precipitates from the reaction vessel (25), the heavy metals are agglomerated and flock is settled, a filtering device (27) in which a solid cake C27 that is obtained by filtering the flock and conducting the solid-liquid separation is used as the raw material for cement and filtrate F27 is circulated in the reaction vessel (25), an electrolysis vessel (28) in which electrolysis is conducted by applying direct current to supernatant F26 from the flocculate vessel (26) and metallic oxide is precipitated, a filtering device (29) in which slurry S28 containing the metallic oxide from the electrolysis vessel (28) is filtered, solid-liquid separation is conducted, solid components M29 are circulated in the flocculate vessel (26), and filtrate F29 is discharged,
- wherein the filtrate F2 is introduced to the filtering device 22 and is subjected to a treatment similar to the chlorine containing desalinated dust treatment.
Dependencies are inferred from the claim text.