Disclosed herein is a method for deoxidizing an Al—Nb—Ti alloy, which includes melting and holding an Al—Nb—Ti alloy containing from 50 to 75 mass % of Al, from 5 to 30 mass % of Nb, and 80 mass % or less in total of Al and Nb by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa to 2.67×10.sup.5 Pa at a temperature of 1,900 K or more, thereby decreasing an oxygen content thereof. The Al—Nb—Ti alloy is prepared using an alloy material formed of an aluminum material, a niobium material and a titanium material and containing oxygen in a total amount of 0.5 mass % or more.

A method for obtaining metals of the 8th to 14th groups, in particular raw copper, comprises the following steps: i) providing and melting down a mixed feed comprising electronic waste in a smelting reactor, so that a first melt with a first metallic phase and a first slag phase is formed; ii) separating out the first slag phase from the smelting reactor; iii) refining the remaining first metallic phase by means of an oxygen-containing gas, possibly with the addition of copper-containing residual materials, so that a second, copper-enriched slag phase is formed; iv) possibly separating off the second slag phase and repeating the step; v) separating off the refined first metallic phase from the smelting reactor; and vi) adding a further mixed feed comprising electronic waste to the remaining second, copper-enriched slag phase and repeating process steps i) to vi).

A method for obtaining metals of the 8th to 14th groups, in particular raw copper, comprises the following steps: i) providing and melting down a mixed feed comprising electronic waste in a smelting reactor, so that a first melt with a first metallic phase and a first slag phase is formed; ii) separating out the first slag phase from the smelting reactor; iii) refining the remaining first metallic phase by means of an oxygen-containing gas, possibly with the addition of copper-containing residual materials, so that a second, copper-enriched slag phase is formed; iv) possibly separating off the second slag phase and repeating the step; v) separating off the refined first metallic phase from the smelting reactor; and vi) adding a further mixed feed comprising electronic waste to the remaining second, copper-enriched slag phase and repeating process steps i) to vi).

Provided is a mold flux used for casing a cast slab, the mold flux including, bases on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al.sub.2O.sub.3), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K.sub.2O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B.sub.2O.sub.3), 3-5 wt % of lithium oxide (Li.sub.2O), and inevitable impurities. Thus, according to the mold flux, a change in components due to silicon oxide (SiO.sub.2) and calcium oxide (CaO) may be suppressed or prevented compared to those in the conventional art.

The present invention relates to functionalized hollow glass microspheres for recovering fine hydrophobic particles, and to their preparation method. The invention also relates to a system for carrying out the method for preparing the functionalized microspheres, to a method for selectively recovering fine material and, lastly, to the use of the microspheres in the separation of, inter alia, minerals, micro drops of organic materials, plastics, and pollutants.

Provided is steel for a wind power gear with improved purity and reliability. The chemical components thereof comprise, in percentages by mass: 0.15-0.19% of C, ≤0.4% of Si, 0.5-0.7% of Mn, ≤0.012% of P, ≤0.006% of S, 1.5-1.8% of Cr, 0.28-0.35% of Mo, 1.4-1.7% of Ni, and 0.02-0.04% of Al, with the balance being Fe and inevitable impurities. A smelting method therefor comprises adding raw materials to a converter for primary melting, transferring same to a refining furnace for refining, carrying out continuous casting after vacuum degassing, and transferring same to a gas protection furnace for electroslag remelting. According to the present invention, a pure electroslag master batch is obtained by continuous casting, and the purity of the material is further improved by means of an electroslag remelting procedure; and the prepared steel material is used in a wind power gear, such that the flaw detection pass rate is significantly increased, large-particle inclusions in the steel material are significantly reduced, and the inclusions are fine and dispersed.

A solid metal flux comprised of compacted granules including (a) alkali chloride salt, (b) alkaline earth chloride salt and (c) at least one nitrate, carbonate, or sulfate salt and/or a fluoride containing salt.

Provided is a mold flux used for casing a cast slab, the mold flux including, bases on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al.sub.2O.sub.3), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K.sub.2O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B.sub.2O.sub.3), 3-5 wt % of lithium oxide (Li.sub.2O), and inevitable impurities. Thus, according to the mold flux, a change in components due to silicon oxide (SiO.sub.2) and calcium oxide (CaO) may be suppressed or prevented compared to those in the conventional art.

Provided is a mold flux used for casing a cast slab, the mold flux including, bases on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al.sub.2O.sub.3), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K.sub.2O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B.sub.2O.sub.3), 3-5 wt % of lithium oxide (Li.sub.2O), and inevitable impurities. Thus, according to the mold flux, a change in components due to silicon oxide (SiO.sub.2) and calcium oxide (CaO) may be suppressed or prevented compared to those in the conventional art.

A method for purifying a powder including grains and contaminants, includes preparing a suspension including the metal powder and a solvent; then while applying mechanical energy to the suspension; dispersing the grains and the contaminants in the solvent; removing the contaminants and the solvent, and drying the grains under a controlled atmosphere.