Porous landscape pebble and method of manufacturing the same
AssigneesOhonokaihatsu Co., Ltd., Ehimeken
InventorsTeruo Ohono, Masahiko Kan
Life of this patent
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Abstract
Fly ash containing unburned carbon of at least 10 wt % is pelletized using water as a binder without substantial addition of an inorganic binder, into unsintered particles each having an average diameter of 2 mm to 30 mm. The unsintered particles pelletized are sintered at a temperature which allows the landscape pebble to have a compression strength of at least 50 N and a water absorption rate of at least 40 wt %.
Claims14
A method for manufacturing a porous landscape pebble, the method comprising:
- a pelletizing process of pelletizing fly ash containing unburned carbon of at least 10 wt % using water as a binder without substantially adding an inorganic binder and of forming the pelletized fly ash into unsintered particles having an average diameter of 2 mm to 30 mm;
- and
- a firing process of sintering the unsintered particles obtained in the pelletizing process at a temperature at which the landscape pebble has a compression strength of at least 50 N and a water absorption rate of at least 40 wt %.
A method for manufacturing a porous landscape pebble, the method comprising:
- a pelletizing process of adding a binder to fly ash containing unburned carbon and pelletizing the fly ash into core particles;
- a coating process of coating surfaces of the core particles obtained in the pelletizing process with an inorganic powder containing fly ash having a less content of unburned carbon and a more content of iron oxide than the fly ash constituting the core particles or an inorganic powder including a fine powder of a rock to thus form surface layer on the core particles and of obtaining unsintered particles having an average diameter of a range 2 mm to 30 mm;
- and
- a firing process of firing the unsintered particles obtained in the coating process to sinter the core particles and their surface layers, making both the core particles and their surface layers porous, and of sintering the surface layers so as to have a strength stronger than the core particles while making the core particles porous.
A porous landscape pebble in which fly ash containing unburned carbon of at least 10 wt % and containing substantially on inorganic binder is pelletized into particles each having an average diameter of 2 mm to 30 mm using water as a binder, and the pelletized particles are sintered at a temperature at which the landscape pebble has a compression strength of at least 50 N and a water absorption rate of at least 40 wt %.
A porous landscape pebble in which surfaces of core particles pelletized by adding a binder to fly ash containing unburned carbon are coated with either fly ash having a less content of unburned carbon than the fly ash constituting the core particles or an inorganic powder including a fine powder of a rock to thus form surface layers and to have an entire average diameter of 2 mm to 30 mm, both the core particles and their surface layers are made porous, the core particles are made more porous than the surface layers, and the surface layers are sintered to have a strength stronger than the core particles.
Dependencies are inferred from the claim text.