31results about How to "Good slagging performance" patented technology

The invention relates to a method for shortening the time for smelting ferrovanadium, belonging to the technical field of vanadium metallurgy. this invention. In the method for smelting ferrovanadium of the present invention, vanadium trioxide, vanadium-containing dust and lime are mixed according to a certain ratio to prepare a mixture; water is added to prepare a wet material, which is formed into a wet aggregate; the wet aggregate is dried to obtain Cold-solidified flux-type vanadium-containing pellets; add the dried cold-solidified flux-type vanadium-containing pellets, vanadium flakes, aluminum particles, iron filings, and lime into a vanadium-iron furnace for electric smelting to obtain ferrovanadium alloys. The present invention can achieve the purpose of shortening the smelting time without changing the follow-up conventional stirring method, and the product quality is not affected, and the effect of dust in the on-site environment of the feeding process and the smelting process is reduced.

The invention relates to laser cladding powder for 1Cr15Ni4Mo3N steel and a preparation method for the laser cladding powder, wherein the laser cladding powder consists of the following components in percentage by weight: 0.09%-0.14% of C, 13.2%-15.2% of Cr, 4.1%-5.3% of Ni, 2.2%-2.7% of Mo, 0.47%-0.98% of Mn, 0.10%-0.93% of Si, 0.03%-0.08% of N, 0.02%-0.15% of B, 0.006%-0.048% of rare earth, 0.010%-0.016% of S, 0.014%-0.022% of P, and the balance iron. The laser cladding powder provided by the invention is specially used in a laser cladding process of 1Cr15Ni4Mo3N steel, so that toughness of a clad layer is improved, excellent bonding strength of a clad interface is guaranteed, wettability of cladding powder is improved, the clad layer is restrained from being cracked, and a crack propagation rate is reduced.

A method for directly producing high-grade zinc oxide from zinc materials containing high chlorine and fluorine, the steps are as follows: mixing and crushing zinc materials containing high chlorine and fluorine, furnace dust, and anthracite pulverized coal in a certain proportion, adding viscose Binder, mixed and rolled to form pellets; after the bottom carbon in the zinc-oxygen furnace is red hot, put the pellets that have been naturally air-dried for two days into the zinc-oxygen furnace, blow air, and release exhaust gas for 10 to 15 minutes. The air volume is controlled at 20%~30% of the total air volume; after closing the gate, increase the blast air volume entering the zinc-oxygen furnace, within half an hour, raise the furnace temperature of the zinc-oxygen furnace to above 1050°C, control the air volume, and make the aluminum pipe section furnace The gas temperature is 450-550°C, and the furnace gas temperature in the bag chamber section is 180-250°C; the smelting time is 1.5-2.5 hours. In the method of the invention, the method and scope of raw material selection are wider, the production cost is low, the metal recovery rate is high, and the obtained zinc oxide content reaches 98-99%.

The invention discloses a method for preparing chromium-containing iron powder by direct reduction of calcium-free chromium slag, which belongs to the technical field of comprehensive utilization of chromium slag. The method comprises the following steps of: firstly, material preparation, wherein the calcium-free chromium slag is mixed with a reducing agent and fluxing agents comprising alumina, and the four-element alkalinity m(MgO+CaO) / m(SiO2+Al2O3) of the mixed material is equal to 0.9 to 1.3; secondly, agglomeration, wherein the mixed material is pressed or pelletized to obtain agglomerates; thirdly, reduction roasting, wherein the agglomerates are roasted in reducing atmosphere at a reduction temperature of 1,250 to 1,350 DEG C for 30 to 240 minutes; fourthly, crushing and fine grinding, wherein the roasted agglomerates are crushed and ground to be fine; and fifthly, magnetic separation, wherein the finely ground powder is subjected to magnetic separation at magnetic induction intensity of 100 to 200 mT, thereby separating the chromium-containing iron powder. According to the method, the calcium-free chromium slag is completely detoxified and fully recycled, the grade sum of calcium and iron in the prepared chromium-containing iron powder is over 80 percent, the chromium recovery rate and the iron recovery rate are respectively over 78 percent, and the method is low in energy consumption and free from secondary pollution.