JPS58190864A - Coloring mixture using red mud and synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to colored mixtures using red mud.

More specifically, a binder (hereinafter referred to as a colored binder) obtained by kneading water-containing red mud and a synthetic resin emulsion using a kneader or the like is created, and this is used as a binder for paint or paving slurry, or as a binder for paint or pavement slurry. This relates to a mixture (hereinafter referred to as a colored mixture) obtained by mixing with a coloring material.

Red mud is a brownish residue produced in large quantities in the aluminum industry when bauxite is treated with alkali to extract alumina.

By the way, in addition to iron oxide, quartz, etc., which are alkaline insoluble solutions present in bauxite, red mud also contains silicic acid components from the alkaline solution dissolved into the solution during alumina extraction, which are fused with the alumina and sodium components in the solution. It contains fine precipitates of sodium aluminum silicate as the main component.

Traditionally, red mud has been landfilled on land and disposed of during the winter months at the venue, but this has led to the difficulty of securing landfill space, environmental issues, and
Due to the cost of disposal, it is now becoming extremely difficult to dispose of them.

For these reasons, we can think of effective ways to use red mud.
Raw materials such as red bricks, tiles, ceramic pipes, roof tiles, ironwork, and cement are used, but it is hard to say that they are used in a sophisticated manner.

In addition, as a method of using it as a paving material, there is a method of drying and pulverizing it and using it as stone powder (Japanese Patent Application Laid-Open No. 51-5320), and a method of using it as a feller for cars (Japanese Patent Application Laid-Open No. 1982-52).
-82924 Publication) Method of mixing red mud into asphalt and using it as a colored paving material
28), but they have drawbacks such as deterioration in strength, decrease in peel resistance, and consumption of a large amount of thermal energy.

The gist of the present invention is to produce a colored binder by kneading water-containing red mud and a synthetic resin, and to produce a colored mixture obtained by mixing the colored binder and aggregate.

The water content of the red mud used in the present invention ranges from about 5 to 60% by weight.

The synthetic resin used in the present invention is one or two of polyvinyl acetate, polyvinyl acetate/ethylene, polyacryl acetate, polyvinyl acetate/DAAM, polyolefin latex, polyvinyl chloride, polyvinyl acetate, epoxy resin ester, etc. Synthetic resin emulsions prepared by appropriately mixing more than one species, further synthetic polymer elastomers, asphalt emulsions, tar emulsions, tar-modified asphalt emulsions, cutback asphalt emulsions,
Rubber latex, process oil, anthracene oil, etc. can also be added to the synthetic resin emulsion for use.

The evaporation residue of the synthetic resin emulsion used in the present invention is preferably 30 to 80% by weight, and the concentration may be either high or low.

Aggregates referred to in the present invention include coarse aggregates, aggregates, and fellers, and the blending ratio of these aggregates is determined depending on the purpose and use. Standards for the type and particle size combination of aggregates are described in, for example, the "Asphalt Paving Guidelines", "Cement Paving Concrete Guidelines", and "Simple Paving Guidelines" published by the Japan Road Association.

The colored binder by Honha Tsumai shows a clear reddish-brown or brick color with a Marcel symbol of 2 or higher, and the paving mixture used in combination with aggregate shows a similar color tone, but when aggregates of the same color are used, The effect is remarkable. For example, mixing with artificial lightweight aggregate, ceramic aggregate, and colored silica sand is recommended.

A method for producing the colored binder of the present invention will be explained.

First, red mud is put into a mixing bowl and kneaded in the air, then a predetermined amount of synthetic resin is added and kneaded until the fine particles of red mud are uniformly dispersed in the synthetic resin, creating a stable slurry that does not cause sedimentation or separation. A colored binder is obtained. This colored binder is used as a paint.

The kneading machine used here needs to have good performance, and Eirich type kneading machines, soil kneading machines, kneading machines used in paints and ceramics, kneaders, etc. are suitable, but Eirich type kneading machines are the most effective. .

A concrete mixer, pug mill mixer, etc. are used to produce the colored mixture obtained by mixing with aggregate.

It was confirmed that the colored binder colored mixture prepared in the above manner has good color development, strength, flexibility, durability, etc., and can be applied without heating using the same method as before.

Example 1 20 kg of red mud (water content 25% by weight) was put into an Eirich-type kneading chamber and kneaded for about 4 minutes, and then about 30 kg of polyacrylic acetate emulsion was added and kneaded for about 3 minutes to obtain the colored binder of the present invention. Approximately 50 kg was produced.

Example 2 Approximately 20 cm of the colored binder of Example 1 was applied in two layers to approximately 100 cm of asphalt pavement surface, and color development Marcel symbol 2 or higher, Deva abrasion test 500 g, 200 times (H-22) 1
A colored pavement surface was obtained which exhibited a brick color of less than mg.

Example 3 About 30 g of the colored binder of Example 1 and about 60 kg of brick-colored artificial lightweight aggregate were mixed to obtain about 90 kg of the colored mixture of the present invention.

Example 4 About 30 kg of red mud (water content 20% by weight) was dry kneaded for about 4 minutes in an Eirich type kneader, and then about 10 kg of polyvinyl acetate and about 5 kg of cutback asphalt emulsion were added and kneaded for about 3 minutes. A colored binder of the present invention was obtained. Further, 70 kg of aggregate having a particle size composition of floating leit, such as fine gap asphalt, and this colored binder were mixed in a concrete mixer to obtain about 115 kg of a colored mixture.

Example 5 40 kg of the colored mixture of Example 4 was put in a sealed plastic bag and stored at room temperature for about 2 months, but there was no change in the normality of the colored mixture.
As a result of a bending test performed on a rectangular rod-shaped specimen measuring 3 x 25 mm, a bending strength of about 25 kg cm2) was obtained.

patent applicant Shoichi Mayama

Claims (1)

[Claims] A red mud-containing mixture that can be applied at room temperature and is characterized in that a colored binder is created by mixing water-containing red mud and synthetic resin, and a colored mixture is created by mixing the colored binder and aggregate.