WO2001087793A1 - Process for making stabilized agglomerates from ash of rice husk or rice straw - Google Patents

Process for making stabilized agglomerates from ash of rice husk or rice straw

Info

Publication number
WO2001087793A1
WO2001087793A1 PCT/IT2001/000237 IT0100237W WO0187793A1 WO 2001087793 A1 WO2001087793 A1 WO 2001087793A1 IT 0100237 W IT0100237 W IT 0100237W WO 0187793 A1 WO0187793 A1 WO 0187793A1
Authority
WO
WIPO (PCT)
Prior art keywords
ash
rice husk
straw
rice
handling
Prior art date
Application number
PCT/IT2001/000237
Other languages
French (fr)
Inventor
Mario Frandino
Oreste Frandino
Original Assignee
Mario Frandino
Oreste Frandino
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mario Frandino, Oreste Frandino filed Critical Mario Frandino
Priority to AU2001264213A priority Critical patent/AU2001264213A1/en
Publication of WO2001087793A1 publication Critical patent/WO2001087793A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0089—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with other, not previously mentioned inorganic compounds as the main non-metallic constituent, e.g. sulfides, glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/10—Hot tops therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/002—Use of waste materials, e.g. slags
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/02—Pretreated ingredients
    • C03C1/026—Pelletisation or prereacting of powdered raw materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/10—Burned or pyrolised refuse
    • C04B18/101—Burned rice husks or other burned vegetable material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present invention refers to a process for the agglomeration and stabilization of the ash from rice husk and rice straw giving properties of easy manipulation, fluent storage and no dusty suspension, obtained with the process of the invention.
  • the ash from rice husk and rice straw has the following typical composition: SiO 2 92 - 97%
  • the ash from rice husk and rice straw can contain carbon depending on to the type and grade of combustion to which the husk and rice straw has been submitted.
  • ash from rice husk and rice straw due to its composition which is basically high porosity silica and to its high lightness and high insulating properties due to its high melting point, like in the glass manufacture, in the production of ceramic and refractory materials.
  • the ash from rice husk and rice straw is used also for making material in the building industry like cement and bricks resistant to high temperatures.
  • silica that is the almost exclusive component of the ash from rice husk and rice straw, has a very branched structure and this gives the product a poor fluidity causing an increase of problems in storaging and handling. Disclosure of the invention
  • the aim of the present invention is a process that gives the ash from rice husk and rice straw characteristics of stability, handling fluidity in manipulation and storage, and anti- dusting properties, granting that such a treatment will not negatively influence the characteristic of lightness, insulating power and high heat resistance, all that obtained without causing any increase of carbon content.
  • Second aim of the invention is a material basically formed by ash from rice husk and rice straw with spheroidal shape, with low tendency to form dust, good handling fluidity and low content of carbon usable in the iron and steel industry, in the glass production, in the ceramic and refractory materials and in the bricks production with high heat resistance.
  • the aims of the present invention are obtained with a several step treatment of the ash from rice husk and rice straw transforming the mass of the ash in a particulate substance used as it is in the above mentioned applications.
  • the treatment of the ash from rice husk and rice straw starts with the mixture of the ash from rice husk and rice straw with agglomerating agents (and/or other additives required by the user) in an aqueous dispersion followed by a grinding of the mixture.
  • the aqueous suspension of the mixture after grinding, that has the aim of destroying the silica structure, is then filtered.
  • the solid filtration residue is separated and sent to a dryer, preferably a hot air operation dryer.
  • the agglomerating agent mixed with the dispersion of the ash from rice husk and rice straw consists of a aqueous solution of a silicic acid salt, and particularly, sodium silicate that does not alter deeply the ions composition in the ash from rice husk and rice straw.
  • the grinding of the ash from rice husk and rice straw mixture is made at room temperature with a ball type mill that ensures a good grinding grade and destruction of the main part of the branched structures of the silica.
  • the filtration of the grinded mixture of the ash and agglomerating agents can be realized with filters like vibrated sieves. Very good results have been obtained drying the ash cake, obtained from the filtration zone, by using hot air dryers in which the hot air flow in countercurrent with respect to the humid material.
  • the hot air flow first aids the split of the water residue, then the action of the hot air combined with the rolling of the particles mixed with the agglomerating agent, gives the particles a spherical shape.
  • the size of the spheres depends on several factors. In particular this dimension depends on the agglomerated agent, on the temperature and on the drying time. In many cases, the spherical particles are treated, after drying, for a certain period in a fluidized bed unit, in order to obtain a conditioning of the particles.
  • Example 1 is provided in order to better illustrate the present invention embodiments, but they are not to be intended as limitative thereof.
  • Example 1
  • the product was submitted to grinding in a ball mill, drum type, for 1 hour and at the end of that period the suspension was homogeneous.
  • the suspension was then filtered throw a safety filter with vibrated sieve, so 2580 kg of cake were obtained and introduced into a dryer with atomization nozzles.
  • the product did not present any tendency to the formation of powder even when was submitted to a fall of 2 meters height.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Metallurgy (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Silicon Compounds (AREA)
  • Noodles (AREA)
  • Medicines Containing Plant Substances (AREA)

Abstract

Process for manufacturing rice husk and straw ash having insulating properties anti-dusting and handling fluidity characteristics; this treatment without affecting any lightness, and without causing any increasing of carbon content comprising the following steps: f) mixing of the ash from rice husk and rice straw with agglomerating agents to make an aqueous dispersion; g) grinding of the mixture to destroy the silica structure. h) filtration of the aqueous suspension to obtain a nozzle atomizable filtrate; i) separation of the solid residue coming from the filtration and sending the same to a hot air dryer; j) recovery of the dried particles of ash from rice husk and rice straw.

Description

Title
"PROCESS FOR MAKING STABILIZED AGGLOMERATES FROM ASH OF RICE
HUSK OR RICE STRAW"
Technical Field The present invention refers to a process for the agglomeration and stabilization of the ash from rice husk and rice straw giving properties of easy manipulation, fluent storage and no dusty suspension, obtained with the process of the invention.
Background art
It is known that the production of husk and rice straw, therefore of ash from rice husk and rice straw is on continuos increase as a result of the increase of the population of the countries where rice is nutritional base as Japan, India and China.
Besides the characteristic of the husk and rice straw and, particularly the ones of the ash from rice husk and rice straw, allow to use them in different technical application.
In fact the ash from rice husk and rice straw has the following typical composition: SiO2 92 - 97%
Al2O3 0.75 - 3%
Fe2O3 0.17 - 2%
CaO 0.36 - 3%
MgO 0.32 - 1.5% Furthermore the ash from rice husk and rice straw can contain carbon depending on to the type and grade of combustion to which the husk and rice straw has been submitted.
Several applications have been proposed for the ash from rice husk and rice straw, due to its composition which is basically high porosity silica and to its high lightness and high insulating properties due to its high melting point, like in the glass manufacture, in the production of ceramic and refractory materials. The ash from rice husk and rice straw is used also for making material in the building industry like cement and bricks resistant to high temperatures.
Nevertheless the ash from rice husk and rice straw, due to his lightness and dust generating property, i.e. the propensity to spread as a dust, is a material that present difficulty in treatment, handling, manipulation and storage. The characteristics of the product can indeed cause serious environmental problems that reduce the above mentioned utilizations.
Furthermore the silica, that is the almost exclusive component of the ash from rice husk and rice straw, has a very branched structure and this gives the product a poor fluidity causing an increase of problems in storaging and handling. Disclosure of the invention
The aim of the present invention is a process that gives the ash from rice husk and rice straw characteristics of stability, handling fluidity in manipulation and storage, and anti- dusting properties, granting that such a treatment will not negatively influence the characteristic of lightness, insulating power and high heat resistance, all that obtained without causing any increase of carbon content.
Second aim of the invention is a material basically formed by ash from rice husk and rice straw with spheroidal shape, with low tendency to form dust, good handling fluidity and low content of carbon usable in the iron and steel industry, in the glass production, in the ceramic and refractory materials and in the bricks production with high heat resistance.
The aims of the present invention are obtained with a several step treatment of the ash from rice husk and rice straw transforming the mass of the ash in a particulate substance used as it is in the above mentioned applications. The treatment of the ash from rice husk and rice straw starts with the mixture of the ash from rice husk and rice straw with agglomerating agents (and/or other additives required by the user) in an aqueous dispersion followed by a grinding of the mixture.
The aqueous suspension of the mixture after grinding, that has the aim of destroying the silica structure, is then filtered. The solid filtration residue is separated and sent to a dryer, preferably a hot air operation dryer.
The action of the hot air and of the agglomerating agent promote the formation of dried material little spheres, that is then cooled and submitted to the conventional conditioning and packaging treatments for the delivery. According to a preferred embodiment of the present invention, the agglomerating agent mixed with the dispersion of the ash from rice husk and rice straw consists of a aqueous solution of a silicic acid salt, and particularly, sodium silicate that does not alter deeply the ions composition in the ash from rice husk and rice straw.
According to another embodiment of the invention, the grinding of the ash from rice husk and rice straw mixture is made at room temperature with a ball type mill that ensures a good grinding grade and destruction of the main part of the branched structures of the silica.
According to a third embodiment of the invention, the filtration of the grinded mixture of the ash and agglomerating agents can be realized with filters like vibrated sieves. Very good results have been obtained drying the ash cake, obtained from the filtration zone, by using hot air dryers in which the hot air flow in countercurrent with respect to the humid material.
In fact, the use of hot air in a dryer with atomization nozzles, in presence of the agglomerating agent, aids the formation of the spherical particles of the ash mixture. In fact the hot air flow, first aids the split of the water residue, then the action of the hot air combined with the rolling of the particles mixed with the agglomerating agent, gives the particles a spherical shape.
The size of the spheres depends on several factors. In particular this dimension depends on the agglomerated agent, on the temperature and on the drying time. In many cases, the spherical particles are treated, after drying, for a certain period in a fluidized bed unit, in order to obtain a conditioning of the particles.
Best mode to carry out the invention
The following examples are provided in order to better illustrate the present invention embodiments, but they are not to be intended as limitative thereof. Example 1
200 kg of ash from rice husk were mixed with 200 kg of aqueous solutions of sodium silicate and 1200 kg of water. The mixture was done by direct blending of the components in the mill itself.
The product was submitted to grinding in a ball mill, drum type, for 1 hour and at the end of that period the suspension was homogeneous.
The suspension was then filtered throw a safety filter with vibrated sieve, so 2580 kg of cake were obtained and introduced into a dryer with atomization nozzles.
There were obtained 1260 kg of dried spheroidal material containing 95% of silica.
The product did not present any tendency to the formation of powder even when was submitted to a fall of 2 meters height.
Same results were obtained using potassium silicate and silica gel as agglomerating agents.

Claims

1) Process for manufacturing rice husk and straw ash having insulating properties anti- dusting and handling fluidity characteristics; this treatment without affecting any lightness, and without causing any increasing of carbon content characterized in that it comprises the following steps: a) Mixing of the ash from rice husk and rice straw with agglomerating agents to make a aqueous dispersion; b) Grinding of the mixture to destroy the silica structure. c) Filtration of the aqueous suspension to obtain a nozzle atomizable filtrate; d) Separation of the solid residue coming from the filtration and sending the same to a hot air dryer; e) Recovery of the dried particles of ash from rice husk and rice straw
2) Process for manufacturing rice husk and straw ash having insulating properties anti- dusting and handling fluidity according to claims 1, characterized in that the agglomerating agent used in the step a) is an aqueous solution of sodium silicate.
3) Process for manufacturing rice husk and straw ash having insulating properties anti- dusting and handling fluidity according to claims from 1 to 2, characterized in that mixture grinding foreseen in step b) is carried out with ball mill.
4) Process for manufacturing rice husk and straw ash having insulating properties anti- dusting and handling fluidity according to 1 or more previous claims, characterized in that filtration of the suspension coming from step b) is made with a filter with vibrated sieves.
5) Process for manufacturing rice husk and straw ash having insulating properties anti- dusting and handling fluidity according to 1 or more previous claims, characterized by the fact that the dryer used in step d) is a hot air dryer, with atomization nozzles. Agglomerate of ash fi-om rice husk and rice straw usable in iron and steel industry, in the glass industry, in the production of ceramic and refractory materials with spheres shape with diameter between 150 aid 3000 micron containing at least 90%> of silica, with specific gravity between 0,35 and 0,65 Kg/It having a dusty grade nearly null.
PCT/IT2001/000237 2000-05-17 2001-05-15 Process for making stabilized agglomerates from ash of rice husk or rice straw WO2001087793A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001264213A AU2001264213A1 (en) 2000-05-17 2001-05-15 Process for making stabilized agglomerates from ash of rice husk or rice straw

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2000A001090 2000-05-17
IT2000MI001090 IT1318522B1 (en) 2000-05-17 2000-05-17 PROCEDURE FOR THE PREPARATION OF AGGLOMERATES STABILIZED BY CENEREDI LOLLA AND RICE STRAW.

Publications (1)

Publication Number Publication Date
WO2001087793A1 true WO2001087793A1 (en) 2001-11-22

Family

ID=11445066

Family Applications (1)

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PCT/IT2001/000237 WO2001087793A1 (en) 2000-05-17 2001-05-15 Process for making stabilized agglomerates from ash of rice husk or rice straw

Country Status (3)

Country Link
AU (1) AU2001264213A1 (en)
IT (1) IT1318522B1 (en)
WO (1) WO2001087793A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1369532A3 (en) * 2002-06-05 2004-04-14 Minebea Co., Ltd. Air purifying sound insulating wall and its applications
WO2004085334A1 (en) * 2003-03-26 2004-10-07 Jajanya Datta Panda A composition for the manufacture of silica insulating refractory brick
US6887288B2 (en) 2002-06-05 2005-05-03 Minebea Co., Ltd. Superfinishing grindstone
EP1602425A1 (en) * 2004-05-29 2005-12-07 Stefanie Heller Granulated powder for continuous casting of metals and his manufacturing method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271679B (en) * 1965-01-09 1968-07-04 Refratechnik Albert G M B H Process for the production of porous granules
US4144050A (en) * 1969-02-05 1979-03-13 Hoechst Aktiengesellschaft Micro granules for pesticides and process for their manufacture
JPS5983974A (en) * 1982-10-29 1984-05-15 松下電工株式会社 Inorganic hardened body
US5073281A (en) * 1989-05-08 1991-12-17 Paules John R Pelletized rice hull ash and bentonite clay insulation
JPH04326937A (en) * 1991-04-26 1992-11-16 Kunnetsupu Sekkai Kogyo Kk Granulation of baked rice hulls
DE4208068A1 (en) * 1992-03-13 1993-09-16 Solvay Barium Strontium Gmbh Calcium, barium or strontium carbonate granulation - with binder addn. and without contact by refractory material
DE19731653A1 (en) * 1997-07-23 1999-01-28 Council Scient Ind Res Production of spheres or pellets from rice shell ash

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271679B (en) * 1965-01-09 1968-07-04 Refratechnik Albert G M B H Process for the production of porous granules
US4144050A (en) * 1969-02-05 1979-03-13 Hoechst Aktiengesellschaft Micro granules for pesticides and process for their manufacture
JPS5983974A (en) * 1982-10-29 1984-05-15 松下電工株式会社 Inorganic hardened body
US5073281A (en) * 1989-05-08 1991-12-17 Paules John R Pelletized rice hull ash and bentonite clay insulation
JPH04326937A (en) * 1991-04-26 1992-11-16 Kunnetsupu Sekkai Kogyo Kk Granulation of baked rice hulls
DE4208068A1 (en) * 1992-03-13 1993-09-16 Solvay Barium Strontium Gmbh Calcium, barium or strontium carbonate granulation - with binder addn. and without contact by refractory material
DE19731653A1 (en) * 1997-07-23 1999-01-28 Council Scient Ind Res Production of spheres or pellets from rice shell ash

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198425, Derwent World Patents Index; AN 1984-156246, XP002177631 *
DATABASE WPI Week 199252, Derwent World Patents Index; AN 1992-429831, XP002177630 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1369532A3 (en) * 2002-06-05 2004-04-14 Minebea Co., Ltd. Air purifying sound insulating wall and its applications
US6887288B2 (en) 2002-06-05 2005-05-03 Minebea Co., Ltd. Superfinishing grindstone
WO2004085334A1 (en) * 2003-03-26 2004-10-07 Jajanya Datta Panda A composition for the manufacture of silica insulating refractory brick
EP1602425A1 (en) * 2004-05-29 2005-12-07 Stefanie Heller Granulated powder for continuous casting of metals and his manufacturing method

Also Published As

Publication number Publication date
AU2001264213A1 (en) 2001-11-26
ITMI20001090A0 (en) 2000-05-17
ITMI20001090A1 (en) 2001-11-19
IT1318522B1 (en) 2003-08-27

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