JP2002263698A - Method of changing fine grain waste to valuable resource - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of changing fine grain wastes, such as sludge or incineration ash or slag, to regenerated crushed stones, filling, etc., which are not used for reclamation of a management type final disposition plant but are circulatable as valuable resources. SOLUTION: A solidifying agent C and necessary water are fed from a hopper of a vacuum soil kneading machine to the fine grain wastes AB and while the mixture is deaerated, the mixture is agitated and extruded. After continuous moldings H are cured, the moldings are crushed by a crusher and are classified. The classified molding are sold as the regenerated crushed stones.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing valuables from fine-grained waste, and more particularly to a method for producing valuables which are inexpensive, safe and frequently used.

[0002]

2. Description of the Related Art Fine-grained waste such as sludge, incinerated ash, or slag is landfilled as industrial waste at a controlled disposal site, or is illegally dumped due to a rise in processing costs, and is distributed as an expensive machine or product for turning into valuable resources. Various methods have been proposed, which are very difficult, such as securing a sales channel to make them available, but they are still trial and error, and the absolute method has not been established.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such a situation, and is an efficient and frequently used valuable waste such as sludge or incinerated ash or slag. It proposes a method of making things.

[0004]

According to the first aspect of the present invention, a fine waste such as sludge or incinerated ash or slag is leached with cement and a hardening agent mainly composed of an inorganic metal element or a heavy metal after solidification. The present invention relates to a method for producing a continuous molded product while mixing and kneading together with a special solidifying agent to be not allowed and necessary moisture, degassing the mixture by vacuum suction, crushing and classifying after curing, and producing recycled crushed stone or embankment material.

According to a second aspect of the present invention, in the first aspect, a reclaimed crushed stone or an embankment is manufactured from fine-grained waste by combining wastes without using a special solidifying agent and using only cement as a solidifying agent. Pertaining to the method of doing so.

[0006]

The valuable material according to the present invention has a market established as a civil engineering construction material and can be used for reclaimed crushed stone and the like which is frequently used. Depending on the application, it can be used for embankment at the site, and a recycling system for discharging industrial waste from the site to the site is completed.

[0007]

According to the present invention, the object to be solidified, which is composed of fine-grained waste contained in the above-mentioned waste powder or waste aqueous solution, is hardened together with cement and a hardening material mainly composed of an inorganic metal element together with necessary moisture. It is mixed and kneaded. By using a hardening agent mainly composed of an inorganic metal element, the inorganic metal element is ion-bonded to the surface of the organic substance contained in the solidification target, and the hydration reaction of cement can be performed even for fine-grained waste containing organic substances. It can be easily solidified without hindrance.

An embodiment of the present invention will be described. The sludge, slag, cement, reclaimed sand and water of the solidification target are adjusted from the hopper of the vacuum kneader so that the total water content becomes about 20%,
The cement amount is shown as a result of setting the water cement ratio to 120% and changing the ratio of the solidification target. The mixture is extruded as a circular continuous molded product while being degassed by a vacuum kneader. This is put into a crusher after curing,
Classify and sell as recycled crushed stone and embankment material. Next, the result of measuring the compressive strength of the product obtained by the above-mentioned production method is shown. The test results of the various formulations proved that the strength of the ready-mixed concrete for civil engineering exceeded 180 kg / cm 2 and was sufficient to be used as recycled crushed stone and embankment material. Furthermore, when a harmful heavy metal or the like is contained in the solidified object, a chelant is added by adding a chelating agent corresponding to the component of the heavy metal contained in the object, thereby causing a chemical change to the heavy metal to be harmless. If a product that can be converted is already available on the market, harmful fine waste such as incinerated ash can be converted into a valuable resource.

According to the present invention, it has become possible to reliably and efficiently recycle fine-grained waste such as sludge, which has been difficult to reuse, as a better product.

[Brief description of the drawings]

Fig. 1 Vacuum kneader AB (various fine waste) C (solidifying agent) D (hopper) E
(Vacuum kneading machine) F (Deaerator) G (Base) H (Continuous molded product)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B09B 3/00 304A

Claims (2)

[Claims] 1. Mixing and kneading fine-grained waste such as sludge or incinerated ash or slag with a cement and a hardening agent mainly composed of an inorganic metal element or a special solidifying agent which does not elute heavy metals after solidification, and necessary water; A method of producing a continuous molded product while degassing the mixture by vacuum suction, crushing and classifying after curing, and producing recycled crushed stone or embankment material. 2. A method according to claim 1, wherein in the case of sludge and slag, a recycled crushed stone or embankment material is produced only with cement without using a hardening agent.