JPH0583294B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for granulating colored aggregate. (Prior art and problems to be solved by the invention) When granulating small pellets having an average particle size of 4 mmφ or less using clay, feldspar fine powder, silica fine powder, fly ash, etc. as raw materials, the granulation evaluation index is the average particle size. , particle size range and strength. In addition, low moisture granulation is advantageous for strength. The appropriate moisture value depends on the type of raw material, particle size, and type of granulator, but usually falls within a very narrow moisture range. When attempting to granulate a raw material containing extremely fine particles such as clay into pellets with a narrow particle size range, and to obtain a small particle size with an average particle size of 4 mmφ or less, conventional technology requires a high appropriate moisture value. For,
For example, when using a pan or drum type pelletizer, it is very difficult to produce pellets strong enough to withstand handling. Therefore, when producing pellets with an average particle size of 4 mmφ or less, the raw material mixture is passed through an extrusion molding machine, the molded product is dried to some extent, and then passed through a high-speed rotary sieving machine with a narrow appropriate moisture range. They had no choice but to resort to methods such as hanging them. However, in this case, there were disadvantages in that a drying step was required and production efficiency was low due to the characteristics of the extrusion molding machine, resulting in high costs. (Means for Solving the Problems) As a result of intensive research, the present inventors have found that high-speed rotary kneading machines with blades, which have conventionally been mainly used as mixers, such as the Eiritzch mixer (manufactured by Eiritzg AG, West Germany), the Lödeige mixer ( By using a mixing, kneading, and pre-granulating machine such as a granulator (manufactured by West German Lödeige), the moisture content during granulation can be significantly lowered to 10 to 18%, which is within the appropriate moisture range of a high-speed rotating granulator. It has been confirmed that the problems of the conventional technology described above can be solved by making it possible to match the grains, thereby eliminating the need for an intermediate drying process, and making it possible to granulate and size particles at a very low cost. Ta. That is, the gist of the present invention is to prepare a mixture of one or more of clay, fine feldspar powder, fine silica stone, and fly ash with a pigment at a moisture content of 10 to 18%.
%, the mixture is pre-granulated using a high-speed rotary kneader with blades, and the obtained pre-granulated product is then sized using a high-speed rotary sizing machine.The average particle size is 4 mmφ. The following is a method for granulating colored aggregate. The above-described high-speed rotary kneader with blades is characterized by a wider range of appropriate moisture content than other granulators. Therefore, by combining the mixing, kneading and preliminary granulation process using this high-speed rotating kneader with blades, and the sizing process using a high-speed rotating granulator, such as Marumerizer (manufactured by Fuji Paudal Co., Ltd.), it is possible to Even if the appropriate moisture content of the high-speed rotation sizing machine changes due to changes in particle size, it can be fully accommodated, and it is possible to granulate small pellets in a narrow particle size range, for example, small pellets of 4 mmφ or less, without drying, at low cost and with high efficiency. becomes. Hereinafter, the present invention will be explained based on examples. (Examples) Table 1 shows examples of the present invention together with comparative examples. The comparative example uses a process consisting of a molding process using a conventional clay extrusion machine → drying process → sizing process using a high-speed rotation sizing machine.The moisture content during extrusion molding must be about 25%, and then Due to drying, the manufacturing cost is 80KwH per unit of electricity.
The dry fuel consumption rate is 75×10 ³ kcal/T, which is high cost. In Examples 1 and 2 of the present invention, the raw materials were pre-mixed, kneaded and pre-granulated using a high-speed rotary kneader with blades, and then subjected to a sizing process using a high-speed rotary sieve. The moisture content of the raw material mixture
Since we were able to significantly reduce the moisture content to 18% and 15.3%, we were able to match the appropriate moisture range of the high-speed rotary sieving machine, eliminating the need for an intermediate drying process, and reducing the power consumption by 40KwH/T. It has become possible to perform granulation and sizing at low cost with a dry fuel consumption of 0. Therefore, after preliminary granulation, it was possible to granulate compacted high-strength small pellets as shown in Table 1 at a low cost by passing the pellets through a high-speed rotary granulating machine in the next step.

[Table] (Effects of the Invention) According to the present invention, a raw material containing extremely fine particles such as clay is granulated into pellets with a narrow particle size range, and the pellets have a small particle size with an average particle size of 4 mmφ or less. When trying to obtain pellets, it is possible to granulate and size small pellets in a narrow particle size range at low cost and with high efficiency without a drying process, so it is of great industrial benefit.

Claims (1)

[Scope of Claims] 1. A mixture of one or more of clay, feldspar fine powder, silica fine powder, and fly ash and a pigment is hydrated.
10 to 18%, the mixture is pre-granulated using a high-speed rotating kneader with blades, and the obtained pre-granulated product is then sized using a high-speed rotating sizing machine. A method for granulating colored aggregate with an average particle size of 4 mmφ or less. 2. The method for granulating colored aggregate according to claim 1, characterized in that an Eirich mixer or a Lodeige mixer is used as the high-speed rotary kneading machine with blades, and a spherical granulator is used as the high-speed rotary granulator.