JPH0244349B2 - NOROKARAKAISHUSHITA SENTETSURYUNOBOSEIBOJINZAI - Google Patents

Description

[Detailed description of the invention]

The present invention is a rust-preventing and dust-preventing agent for pig iron prepared from slag. A small amount of pig iron still remains in the slag recovered from the blast furnace, and this is being recovered and reused. This pig iron is collected by a magnet after pulverizing the slag, but it is easily rusted and has a large amount of slag pulverized powder attached to it, which tends to create dust during transportation, so a combination of these is desired. However, rust prevention of pig iron recovered from slag must be very inexpensive, and economically available rust preventive agents currently have little effect. For example, so-called rust preventive dissolved in mineral oil.
Even if an oil film is formed on the surface of pig iron with anti-corrosion oil, rust will develop in a short period of time and there will be little effect. On the other hand, resin emulsions and aqueous surfactant solutions that have been conventionally used to suppress dust generation cause severe rusting and are hardly of practical use. For the reasons mentioned above, no material has hitherto been found that effectively achieves rust prevention and dust prevention for slag-recovered pig iron. The present invention simultaneously achieves rust prevention and dust prevention of pig iron recovered from this slag. That is, the present invention relates to a rust and dust preventive agent for pig iron recovered from slag containing higher fatty acids and/or natural oils and fats. The higher fatty acids used in the present invention are saturated or unsaturated fatty acids having 12 or more carbon atoms, such as lauric acid, palmitic acid, stearic acid, coconut oil fatty acid, bran oil fatty acid, lard fatty acid, beef tallow fatty acid, tall oil fatty acid, These include abietic acid, resin acid, oleic acid, erucic acid, etc., and natural oils include soybean oil, bran oil, whale oil, beef tallow, and tung oil.
Particularly preferred are higher fatty acids, and those that are solid at room temperature, particularly tall oil fatty acids, bran oil fatty acids, lard fatty acids, beef tallow fatty acids, and coconut oil fatty acids, are particularly suitable in terms of cost and effectiveness. Originally, higher fatty acids and natural oils and fats are not necessarily excellent as rust preventive agents, but rather they are used only for the purpose of blocking iron from air by creating an oil film. In particular, higher fatty acids alone are hardly expected to have any rust-preventing effect. The reason why this is effective in preventing rust on slag-recovered pig iron is thought to be because the slag-pulverized powder adhering to the surface of the pig iron reacts or forms adducts with fatty acids or natural fats and oils, but the details are not clear. Similar to natural oils and fats, mineral oils and paraffin waxes that form oil films do not achieve satisfactory effects, and typical rust inhibitors such as petroleum sulfonates, petrolatum oxide, sorbitan fatty acid esters, etc. Even if it is used after being dissolved, a satisfactory effect cannot be obtained. In the present invention, higher fatty acids and natural oils and fats may be used in combination, or in combination with other conventionally known rust preventives and mineral oils. It is sufficient to use higher fatty acids and/or natural oils in an amount of 0.1 to 10% by weight, particularly 0.2 to 0.7% by weight, based on the recovered pig iron. The rust and dust preventive agent of the present invention may be applied uniformly to the surface of recovered pig iron particles in a mixer (for example, a concrete mixer). The slag recovered pig iron treated with the rust preventive and dust preventive agent of the present invention is 1
It will not rust even if left for months, and dust during transportation is significantly reduced. The present invention will be explained below with reference to Examples. In the examples, parts or % are expressed by weight unless otherwise specified. Example Pig iron grains A or B recovered after crushing slag
1000 parts (purity and particle size are shown in Table 1) were placed in a concrete mixer, a predetermined amount of the rust and dust preventive agent shown in Table 1 was added, and the mixture was sufficiently mixed until it was uniformly adhered to the surface of the pig iron particles. The degree of dust generation immediately after and one month after the treatment, and the occurrence of rust after one day and one month were evaluated. The results are shown in Table-2. Dust generation rate: 5 kg of pig iron particles were dropped from a height of 0.5 m under the condition of a wind speed of 5 m, and the amount of dust was measured by the filter paper absorption method at 1 m downwind. Rust level: 50 kg of pig iron particles were placed on a cone indoors and the level of rust was observed. The evaluation is as follows. 0: No rust at all 1: Slight rust 2: Considerable rust 3: Severe rust

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Claims (1)

[Claims] 1. A rust-preventing and dust-preventing agent for pig iron particles recovered from slag containing higher fatty acids and/or natural oils and fats. 2. The rust and dust preventive agent according to item 1, wherein the higher fatty acid is a solid fatty acid.