JPH09299907A - Easy burning method for difficult to burn - Google Patents

Abstract

(57) Abstract: A polyvalent metal or a polyvalent metal ion (Ca, Mg, Al, Zn, Fe, etc.) is added to a substance that is difficult to fire or a substance that can be fired but cannot be fired efficiently. Add the substance containing and bake. [Effects] Substances that were difficult to bake are candy-shaped,
It can be incinerated in powder form without tar formation,
Alternatively, a substance that must be fired at high temperature / long time can be efficiently fired by firing at low temperature / short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily and / or efficiently burning a substance that is difficult to burn, and is very useful for treating wastes and treating foods.

[0002]

2. Description of the Related Art A conventional burning method uses a gas or petroleum-based fuel and burns it in the atmosphere in a batch system or a continuous system. Since it is difficult to burn adsorbent substances and adhesive substances that are difficult to burn as they are, it is necessary to burn a large amount of flammable substances and gradually add difficult-to-burn substances into them. It is often discarded without doing.

[0003]

[Problems to be Solved by the Invention] When an adsorbent substance, an adhesive substance or the like which is difficult to be fired is tried to be fired by a conventional batch method or a continuous method, it becomes a candy-like or tar-like state, so that it is ashed (powdered). It was difficult to do. In addition, substances such as activated sludge that are burned but have a high water content require a large amount of energy and time to be completely burned, so it is unavoidable that they must be discarded while containing a large amount of carbide. However, the location of waste, the amount of waste, etc. have become problems, and solutions are strongly required to prevent pollution. In view of the state of the art as described above, the present invention is capable of easily firing and pulverizing various difficult-to-fire materials, or although firing itself is possible, a large amount of energy or special energy is required for firing. Regarding waste that requires facilities, etc., the purpose is to efficiently incinerate it.

[0004]

Means for Solving the Problems The present invention has been made in order to achieve the above-mentioned object, and as a result of extensive studies from various directions, it was found that a substance to be fired contains a polyvalent metal or a substance containing a polyvalent metal ion. By firing in addition, it is possible to fire ash for difficult-to-fire substances without causing candy-like or tar-like properties, and for calcinable substances, fire even if the firing temperature is lowered. It was discovered that the firing time can be shortened, that is, the firing time can be shortened, in other words, the firing can be performed at a low temperature and in a short time, that is, extremely efficiently. Hereinafter, the present invention will be described in detail.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION To carry out the present invention, 5 to 1000 parts of a polyvalent metal or a substance containing a polyvalent metal ion may be added to 100 parts of an object to be fired, and the mixture may be fired at 500 to 1500 ° C.

As the polyvalent metal, calcium, magnesium, aluminum, zinc, iron, copper, cobalt, manganese, nickel and other metals having a valence of 2 or more can be used. In the present invention, these polyvalent metal ion-containing substances are also used. In addition to these (per) oxides and hydroxides, salts with inorganic acids such as hydrochloric acid and sulfuric acid, salts with organic acids such as phosphoric acid, acetic acid, lactic acid and citric acid can also be used. Is. For example, (per) calcium oxide, calcium chloride, calcium carbonate, calcium phosphate, calcium hydroxide, magnesium and the like can be used.

Naturally-derived substances can also be used, for example, natural calcium materials (containing calcium carbonate, calcium phosphate, etc.) obtained from shells, egg shells, bones, corals, pearls, etc., seawater concentrates. A natural magnesium material such as, a calcined calcium obtained by calcining a natural calcium material or a natural magnesium material, or calcined magnesium can be used. The above-mentioned polyvalent metal or polyvalent metal ion-containing substance, or a naturally derived substance can be used alone or in combination of two or more kinds within the same group or between different groups.

[0008] The objects to be burned are difficult to burn, and
Firing is possible, but any firing material that requires high temperature and / or long time for firing can be used. Difficult-to-baked substances include substances with high hygroscopicity or high water content such as whey minerals and dairy product by-products, as well as seafood, livestock,
It includes viscous industrial wastes such as poultry offal and other wastes, but also all non-sinterable substances discarded from the food industry and other industries.

The calcinable materials include okara,
It is possible to burn starch-producing meal, sake-making meal, food-producing by-products such as activated sludge or the like, and industrial waste without firing itself, but it is possible to use extremely high temperatures and / or Alternatively, all materials that require long firing times are included.

In this way, various burning objects can be efficiently burned and ashed or powdered.
Waste treatment can be carried out extremely efficiently and advantageously without causing secondary pollution. In addition, for example, the calcined powder of whey mineral and other edible waste can be discarded without causing pollution, and can be reused as food, fertilizer, etc., and the effect of the present invention is simply waste. It is not limited to processing.

Examples of the present invention will be described below.

[0012]

[Example 1: Firing of whey mineral (1)] When 10 g of whey mineral was placed in a crucible and fired at 1300 ° C for 5 hours in an electric furnace, a white candy-like substance stuck to the bottom of the crucible. Take 10 g of whey minerals in three crucibles, and use shell-derived CaO, Ca (OH) ₂ , and CaCO _{3 for each.}
1 g each were mixed and fired at 1300 ° C. in an electric furnace to obtain 1.75 g, 1.62 g and 1.72 g of unsolidified white powder, respectively.

[0013]

[Example 2: Firing of whey mineral (2)] When 100 g of whey mineral was placed on a ceramic plate and incinerated at 860 ° C for 1 hour in an open type incinerator, a sample solidified and could not be collected. On the other hand, 1 g of shell powder was evenly mixed with 100 g of whey mineral and baked in the same manner.
A solid incineration product of 3.0 could be collected.

[0014]

[Example 3: Sintering of scallop liver] 100 g of scallop liver discarded from a seafood processing plant was collected in a crucible and baked at 600 ° C for 2 hours in an electric furnace, and it became a paste and adhered to the crucible. , Could not be pulverized. On the other hand, 10 g of the scallop shell baked powder was added to 100 g of the scallop shell liver, mixed uniformly, and baked in the same manner to obtain 12 g of a powdery baked product.

[0015]

[Example 4: Firing of activated sludge] 100 g of excess sludge generated during industrial wastewater treatment was put in a crucible and heated to 500 ° C and 70 ° C.
When each was fired at 0 ° C. for 3 hours, 2.2 g of a fired product was obtained at 700 ° C., but ashing could not be done at 500 ° C. On the other hand, after uniformly mixing 10 g of calcium peroxide (CaO ₂ ) with 100 g of sludge,
When baked in an electric furnace at 500 ° C. for 3 hours, 13.2 g of a baked product was obtained.

[0016]

[Example 5: Okara baking] 200 g of tofu okara was sampled in a crucible and baked in an electric furnace at 700 ° C and 1000 ° C for 2 hours. About 1000g of baked product was obtained by baking at 1000 ° C. However, it could not be completely incinerated by firing at 700 ° C. On the other hand, when 200 g of okara was placed in a crucible, 50 g of shell powder was added, and the mixture was uniformly mixed and calcined at 700 ° C. for 2 hours. As a result, 16.7 g of an incinerated calcined product was obtained. Similarly, when 50 g of Ca (CaO) for burning shells was added to 200 g of okara, the mixture was uniformly mixed and fired at 700 ° C., it was possible to ash in 1.5 hours.

[0017]

EFFECTS OF THE INVENTION According to the present invention, a substance which has been difficult to be fired in the past can be easily fired without becoming a candy-like or tar-like substance and can be ashed into a powder form, or even a substance which is difficult to be fired. Even if the firing temperature is lowered, the firing can be efficiently performed and / or the firing time can be shortened.

Therefore, the present invention is extremely excellent as a waste treatment method, and is not only highly evaluated as a pollution control technique, but the obtained fired product can also be used for foods, feed fertilizers and the like. Outstanding.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatake Karai 1-26-11 Midori, Sumida-ku, Tokyo Meiji Dairy Co., Ltd. Tokyo branch office (72) Inventor Masakazu Seki 2-22-6 Ohashi, Meguro-ku, Tokyo In Healthcare Tech Co., Ltd. (72) Inventor Hiroyuki Otsuka 15-22 Ichibancho, Mishima City, Shizuoka Prefecture

Claims (6)

[Claims] 1. A method of firing an object to be fired, which comprises adding a polyvalent metal or a substance containing a polyvalent metal ion to the object to be fired. 2. A polyvalent metal or a substance containing a polyvalent metal ion is added in an amount of 5 to 1000 parts with respect to 100 parts of an object to be fired,
Firing at 500 to 1500 ° C., A method of firing an object to be fired. 3. The polyvalent metal is Ca, Mg, Al, Zn, F.
e, Cu, Co, Mn, and Ni, wherein the polyvalent metal ion-containing substance is (poly) of the above polyvalent metal.
The method according to claim 1 or 2, wherein the method is an oxide, a hydroxide or a salt, or a naturally derived substance. 4. A method of easily firing a material to be fired when the object to be fired is a difficult material, and a low temperature and / or
Or it is a method of baking in a short time, The method of any one of Claims 1-3 characterized by the above-mentioned. 5. The method according to claim 4, wherein the substance that is difficult to burn is an adsorptive substance or an adhesive industrial waste, and the burnable substance is an industrial waste. 6. A fired product obtained by the method according to any one of claims 1 to 5.