JPH0310025A - Method for supplying raw material to briquetting machine - Google Patents

Abstract

PURPOSE:To stably obtain inexpensive briquettes by disintegrating the pseudo grains and pseudo lumps contained in raw materials under transportation and heating and holding these grains and lumps to the temp. possessed by the raw materials or above, thereby preventing the failure in the fixed rate supply of the raw materials due to the chute clogging and improving moldability. CONSTITUTION:The powder raw material mixture after moisture adjustment to be transported 3 is supplied to a briquetting machine 1 consisting of a pair of molding rolls having many molding calibers on the cylindrical peripheral surfaces. Namely, the supply of the raw material mixture is executed via a chute 2 disposed under the end of a conveyor 3 on the roll clearance of the machine 1. The pseudo lumps 11 and pseudo grains 12 sent onto the conveyor 3 are ground to the powder raw materials by a disintegrating machine 4 disposed in the end part of this conveyor. The ground raw materials are supplied to the chute 2. As a result, the pseudo grains and pseudo lumps are prevented from entering the briquetting machine; in addition, the stagnation of the wet raw materials on the inside wall surface of the chute and the molding rolls of the briquetting machine is obviated at the time of feeding these raw materials. The briquettes having the good moldability are, therefore, stably obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for supplying raw materials to a briquette machine, particularly when preparing viscous nickel oxide ore powder.
This is a proposal for a new method for improving the quality of molded briquettes by constantly and stably supplying raw material powder with constant properties to a briquette machine.

[Conventional technology]

When smelting nickel ore, especially pyro-smelting ferronickel from viscous nickel silicate ore such as garnilite, the raw ore is processed into a cake by dry, wet or semi-dry methods, and after the water content is adjusted. The briquettes are then fed to a briquette machine, where they are formed into pillow-shaped and almond-shaped briquettes (briquettes).

The above-mentioned briquette machine is typically of the type shown in FIG.
is a forming roll having a large number of forming holes (pillow type, almond type, etc.) on the circumferential surface of the body, and in this pair of forming rolls la and lb, the half-shaped forming holes meet in a facing state. The forming roll is rotatably arranged so as to form a predetermined molded body, and the la of this forming roll is
, lb is provided with a chute 3 at the upper end of the casing. Further, on this chute 3 is located the end of a conveyor 4 for supplying the mixed raw material powder for forming to the briquette machine, and the raw material powder is passed from the conveyor end 4 through the side surface of the chute 3. It will be supplied to the inter-roll clearance section.

[Problem to be solved by the invention]

Conventionally, when supplying raw material powder to the above-mentioned briquette machine, the mixed raw material powder for molding that has passed through a pug mill or a rondo mill is charged as is through a chute, so that the grains and large particles generated and grown during handling are Many pseudo-shaped lumps were put into chute 3, causing machine trouble. In addition, since wet raw materials suitable for molding are supplied, if they come into contact with the chute 3, they will stick (sticky).
This has the disadvantage that it gradually grows and obstructs the quantitative supply to the roll clearance.

An object of the present invention is to develop a raw material supply method that can overcome the drawbacks of the prior art.

[Means to solve the problem]

Prevents the contamination of pseudo-clumps, etc. that cause machine troubles,
In addition, as an effective method for overcoming the inhibition of quantitative supply due to chute clogging, the present invention provides a raw material supply method having the following features, namely, a pair of forming rolls having a large number of forming holes on the circumferential surface of the drum. In a method of supplying a moisture-adjusted powder mixed raw material conveyed by a conveyor to a briquette machine, this supply is carried out via a chute disposed below the conveyor end above the roll clearance of the briquette machine, A crusher is disposed at the end of the conveyor to crush pseudo grains and pseudo lumps contained in the conveyed raw material powder, and at the same time, at least the part of the chute in contact with the feed raw material powder is heated to a temperature higher than that of the raw material powder. We propose a method for supplying raw materials to a briquette machine that is characterized by heating and holding.

The above-mentioned idea of the present invention will be explained in more detail below.

[Regarding crushing of 414 lumps, etc.] When the present inventors observed the mixed raw materials charged, one of the molding machine troubles was that the mixed raw material powder coming out of the pug mill or rondo mill was damaged during mill mixing and handling. In the middle of the briquetting process, the briquetting granules are often stopped mainly due to the non-uniformity of the moisture content, and the granules often grow into granules, which are then charged directly into the briquetting machine. It turned out to be something.

Therefore, in the present invention, a roll crusher was installed at the end of the conveyor before entering the chute, and an attempt was made to crush and powder the agglomerates. As a result, the input raw materials returned to their original powder form and machine troubles were drastically reduced.

(2) Regarding heating of the chute Wet raw material powder with a moisture content of 10 to 20% is inherently prone to adhesion during handling, and this phenomenon is particularly noticeable even in the chute where the raw material falling through the conveyor always comes into contact. That is, the raw material grains to be supplied tend to adhere (settle) to the chute, and moreover, they tend to grow gradually. Therefore, it goes without saying that the chute is likely to become clogged, and is particularly a factor that hinders the stable supply of raw materials in a quantitative manner.

The inventors of the present invention conducted extensive research on this matter and found that there are facts as shown in Table 1.

As can be seen from Table 1, the adhesion of wet powder is strongly influenced by the temperature of various objects with which it comes into contact, and adhesion is significant when the temperature is lower than that of the powder.

Based on this, we conducted an experiment on the chute and found that the area in contact with the wet raw material powder was kept at a higher temperature than the raw material powder (35°C in winter to 43°C in summer). I found out that everything is true.

Therefore, in the present invention, by indirectly or directly heating at least the part of the chute with which the raw material powder comes into contact with various types of heaters or hot air, it was possible to completely eliminate the sticking problem.

〔Example〕

FIG. 1 is a route map of a typical briquette machine used in carrying out the method of the present invention, in which reference numeral 1 is the main body of the briquette machine, 2 is a briquette hopper used to supply raw materials to the machine, and 3 is the hopper. A briquette conveyor with a conveying end (conveyor end) facing upward; 4 is a crusher having a large number of crushing teeth on the circumferential surface of the briquette at the conveyor end of the briquette conveyor, located directly above the conveyor drum; This shows that.

The crusher 4 improves the formability of briquettes by crushing the pseudo lumps 11 sent on the briquette conveyor 3 into a powdered raw material.
The conveyor drum 3a and the conveyor drum 3a are used to compress and crush the particles.

In addition, Fig. 2 (al) and (b) show that 4 to 12 long heaters 5, round heaters 6 (375 W to 1.2 )
It shows that it seems to be stuck. As a result, the hopper 2 was always maintained at a temperature of 30° C. or higher. In addition,
7 in the figure is an inspection window.

〔Example〕

When we used this kind of equipment to feed clay ore raw material with a moisture content of 17%, we found that the machine troubles that were common in the past disappeared completely.

In other words, before the heaters were installed, raw materials would settle on the briquette ramper and gate plate, causing poor material flow and resulting in frequent briquette/briquette forming defects (especially in winter), which required cleaning once every 3 to 4 hours. However, there were almost no more.

On the other hand, the installation of such a heater has eliminated the buildup around the briquette machine, but when the raw materials that have settled in the hopper, belt conchute, etc. that are present before reaching that point fall, they become lumps and become stuck around the briquette machine. However, when these pseudo-clumps were crushed in the crusher 4 just before they fell into the briqueft hosopar, they were crushed 50 times a month.71 The number of operations stopped and cleaning due to solid lumps was drastically reduced to less than 1,710 times.

〔Effect of the invention〕

As explained above, according to the present invention, pseudo grains.

Pseudo lumps do not enter the briquette machine, and wet raw materials no longer have to settle on the inner wall of the hopper or the forming rolls of the briquette machine, ensuring stable quantitative supply, which improves formability. Cheap briquettes can be stably produced.

[Brief explanation of the drawings] Figure 1 is a route map of the briquette machine, Figure 2 (al,
fb) is a route map showing the installation positions of heaters in the briquette hopper. l... Briquette machine body, 2... Briquette machine 3... Briquette conveyor, 4... Crushing machine, 5, 6... Heater 11...
Pseudo lump, I2...pseudo grain.

Claims (1)

[Claims] 1. When supplying a moisture-adjusted powder mixed raw material conveyed by a conveyor to a briquette machine consisting of a pair of forming rolls having a large number of forming holes on the circumferential surface of the body, this supply In this method, a crusher is installed at the end of the conveyor to remove pseudo grains and pseudo lumps contained in the conveyed raw material powder. A method for supplying raw materials to a briquette machine, which comprises crushing and maintaining at least a portion of the chute in contact with the raw material powder at a temperature higher than that of the raw material powder.