JPS6054799A - Treating agent of water-containing material - Google Patents

Abstract

PURPOSE:To obtain a solidifying agent for sludge, etc. by mixing fly ash, lime, and aluminum salts in a specified ratio. CONSTITUTION:50-250kg a treating agent consisting of 50-80% fly ash, 15- 40% lime, and 5-10% aluminum salt such as aluminum sulfate is added to 1m<3> of a water-contg. material such as silt, sludge, soft ground, etc. The solid material having high strength and without a fear of returning again to mud can be obtained in this way.

Description

[Detailed description of the invention] The present invention relates to a treatment agent for hydrated materials.

Recently, the treatment of water-containing materials such as sludge and sludge discharged as industrial waste has become a major problem.

For the purpose of solidifying these wastes, cement-sodium silicate-based treatment agents or treatment agents with added lime, etc. have been proposed, but both require a large amount of treatment agent and are difficult to process and solidify. It cannot be said that the product is sufficient in terms of strength and water resistance.

On the other hand, with the rise in oil prices, coal-fired power generation is being reconsidered, but the combustion of coal naturally produces coal ash, or fly ash, and its disposal is an issue that will need to be considered in the future. . Since fly ash itself does not have hydraulic properties, it is currently used with the addition of about 10-30% cement (K) as an admixture. As a result of repeated research on the properties of fly ash, the inventor found that it is difficult to solidify even when water is added to a mixture of fly ash and lime, but when a small amount of aluminum sulfate is added, a reaction occurs quickly and solidifies. Based on this discovery, the present invention was established.

The present invention is a treatment agent for hydrated materials comprising fly ash, lime and aluminum salt.

Lime is used in the form of quicklime or slaked lime.

As the aluminum salt, for example, aluminum sulfate and aluminum chloride are used, and these may be used in the form of an aqueous solution if desired.

The preferred ratio of each component in the treatment agent is fly ash 5
0-80%, lime 15-40%, aluminum salt 5-1
It is 0%.

Examples of water-containing substances targeted by the treatment agent of the present invention include sludge or sludge discharged from industries and living environments or deposited in rivers, lakes, and marshes, soft ground, and the surface layer of the ground.

The sludge or sludge may contain a large amount of organic matter, such as valve sludge or leather sludge, or may contain oil, such as oil sludge deposited at the bottom of an oil tank.
It may also be one containing heavy metals, such as plating sludge. The treatment agent of the present invention can also be used to solidify particulate waste such as incineration ash and dust by adding moisture if necessary. The treatment agent of the present invention generally has a concentration of about 50% per m3 of water-containing material.
Approximately 250 kg is used, but a larger or smaller amount may be used depending on the water content, density, components, etc. of the hydrated material.

As shown in Tables 1 and 2, when the treatment agent of the present invention is used, a solidified product with much higher strength than that of cement or lime can be obtained, and there is no risk of re-silting.

Table 1 Treatment target Sandy sludge (water content 51.5%) Number of days elapsed after treatment 7 days * Composition Nibli ash 70% Quicklime 20% Aluminum sulfate 10% Table 2 Treatment target Clay (water content 76.5%) , Shirushi clay upper part 9
1.5%) Number of days elapsed after treatment 71] *Composition: Fly ash 70% Quicklime 20% Aluminum sulfate 10% Furthermore, the strength of the solidified product obtained using the treatment agent of the present invention is only superior at the initial stage. But as the days pass, it rises twice. Table 3 shows comparative examples with cement.

Table 3 Treatment target: Seafloor sludge (water content 233.0%, density 1.
185! /cn? , organic content 90.0%) Addition amount of treatment agent 100 kQ/m3 *Composition: Friar Nsch 60% Quicklime 30% Aluminum sulfate 10% The treatment agent of the present invention has an excellent effect of fixing heavy metal ions, so for example It can also be mixed with plating sludge and used to prevent heavy metals from escaping. Additionally, it is less alkaline than lime or cement, which helps prevent secondary pollution.

The present invention will be further explained below with reference to Reference Examples and Examples. In these examples, parts are by weight.

Reference example: Friar 7 for 100 parts of pond sludge with a water content of 200.
9120 parts of Fryer Nsch 20 Is and 20 parts of quicklime were mixed and left to stand for one day, but it did not harden at all.

Example 1 When 10 parts of a mixture of 0 parts of Waraiafu 93F 20 parts of quicklime and 10 parts of aluminum sulfate was mixed into the upper sludge, a gelation phenomenon was observed after about 10 minutes, and the viscosity increased and solidified with the passage of time.

After - days, the unconfined compressive strength of the solidified product is 0.5 kqf/
(, reached i.

Example 2 Oil mud (moisture 15%,
60 parts of fly ash, 25 parts of quicklime and 1 part of aluminum sulfate per 100 parts (including oil and sand)
20 parts of 5 parts of the compound were mixed. The mixture became powdery and could be easily removed.

Claims (1)

[Claims] 1. A treatment agent for hydrated substances consisting of coal ash, lime and aluminum salt. 2. The treatment agent according to claim 1, comprising 50-80% coal ash, 15-40% lime and 5-10% aluminum salt. 3. The processing agent according to claim 1 or 2, wherein the aluminum salt is aluminum sulfate.