JPS62136548A - Magnetic fireproof composition - Google Patents

Abstract

PURPOSE:To obtain a magnetic fireproof composition used for magnetic conveyance by coating aggregate of one or more among magnesia, chrome, alumina, silica, silicon carbide and graphite with powder of one or more among Fe, Ni, Co and an alloy thereof. CONSTITUTION:90-70pst.wt. of aggregate of one or more among magnesia, chrome, alumina, silica, silicon carbide and graphite are coated with 10-30pst. Fe, Ni, Co or alloy thereof and granulated to obtain a magnetic fireproof composition. When an outer core obtd. by connecting coils in series is set on an inner core in the magnetic fireproof composition, AC is supplied and voltage is raised, the magnetic fireproof composition moves.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic refractory composition (hereinafter simply referred to as a magnetic material) used for magnetically conveying powder over an extremely short distance.

PRIOR ART Methods of transporting powder using gas (generally air) have been widely adopted, but these methods tend to generate dust, are not sanitary, and are not suitable for short-distance transport. For example, there is a method of putting powder into a pressure tank and pumping it through piping using compressed air, pro-9, oxygen, or nitrogen gas, but all of these methods are suitable for conveying relatively long distances. There is. In addition, the above-mentioned conveyance method may be applied to spraying or thermal spraying. In this case, when powder is ejected from the edge of the nozzle or burner, dust is generated, which is difficult to completely prevent.

Furthermore, although there are already conveyance machines that move iron powder or iron pieces while mechanically moving magnets, there is currently no technology for magnetically conveying refractories.

Problems that the invention aims to solve Even when using gas to transport a small amount of powder over a very short distance, a blow tank, compressor, storage tank, piping, or dust collector is required, making the equipment too large and difficult to install. The area will be larger and the price will be higher. Furthermore, it has not been proposed to transport non-magnetic refractories by magnetic force.

Means for Solving the Problems The present invention has been made in order to eliminate the drawbacks of powder gas conveyance, and its object is to provide a magnetic material that can be conveyed by magnetic force. That is, the present invention includes 90 to 70 parts by weight of at least one aggregate of magnetism, chromium, alumina, silica, silicon carbide, and graphite, and 10 to 70 parts by weight of one or more of iron, nickel, and cobalt, or alloys thereof. To provide a magnetic refractory composition comprising 30 parts by weight. An outer core made of magnetic material coated with powder of one or more of these alloys or a coil connected in series is set on top of the inner core, and when the AC power is turned on, the material is placed into the hopper of a conveying device that generates magnetic force. , a magnetic refractory composition that can be transported by magnetic force.

In the present invention, 1f of iron, nickel, and cobalt that coats the surface of at least 11 aggregates of magnesia, chromium, alumina, silica, silicon carbide, and graphite [or more than 1f of these alloys or less than 10 parts by weight of these alloys are transported by magnetic force. The force becomes weak, and some of the particles become stagnant, and some of them become unable to be conveyed. On the other hand, as the amount of one or more of iron, nickel, and cobalt or their alloys is increased beyond 30 parts by weight, the conveying force increases, but the quality of the constructed body deteriorates. (The melting temperature decreases.) Example: Put fused alumina (30 to 50μ) and ferric oxide (red iron oxide, 20μ>) into a high-speed mixer at a weight ratio of 4:1. ) and Chotsuno mother (granulation blade) and increase the rotation, Azocheetah: 1100rp, Chotsuno'? - Set to 300 rpm, open the ball pulp in one tank of binder, drop it little by little and mix, bond and granulate (about 3 minutes). agitator
Due to the centrifugal force caused by the rotation of the powder, the powder rises in a spiral around the cone, and at the cone (20°), the mixture repeats an inversion motion and flows in a spiral along the central axis.
4' -ij , z4in/- (a solution of 3 parts of ethyl alcohol added to phorinyl pyrrolidone powder and mixed)
When the granulation is completed, stop the chotu-ya-, switch the anocheater to low-speed rotation (1 to 2 rpm), and discharge the granules. do. Then, put it in the dryer and dry it for 12 hours. The granules move when the inner core is set on top of the outer core, which has 24 coils connected in series, the AC power is turned on, and the voltage is increased by operating the slider. (Particle size after coating: near 0μ, refractory particle conveyance n: 51.3 fl/min) Effect of the invention +11 A small amount of powder can be conveyed even at extremely short distances without using large-scale equipment like gas conveyance. (2) Powder is transported by magnetic force, so no dust is generated.

(3) Since no gas is used for transportation, there is no risk of reactions such as oxidation.

Table 1 shows the quality of the magnetic refractory composition of the present invention and the conventional product.

Claims (1)

[Claims] magnesia, chromium, alumina, silica, silicon carbide,
A magnetic refractory composition comprising 90 to 70 parts by weight of at least one aggregate of graphite and 10 to 30 parts by weight of one or more of iron, nickel, cobalt, or an alloy thereof.