38results about How to "Conducive to smelting" patented technology

The invention relates to a method for extraction of potassium and sodium from iron ore and synchronous preparation of ironmaking burden. The method includes: adding a reducing agent into an iron-containing raw material with high potassium and sodium content to prepare carbon-containing pellets of certain granularity, and subjecting an iron-containing raw material with low potassium and sodium content to mixing granulation so as to obtain a mixture; mixing the carbon-containing pellets with the mixture according to certain mass ratio, conducting material distribution and ignition, then circulating a low oxygen gas with a small CO content to perform sintering roasting, thus obtaining the ironmaking burden with certain reducibility and low potassium and sodium content, and gathering potassium and sodium in sintered precipitator dust; subjecting the precipitator dust rich in potassium and sodium to agglomeration and direct reduction to obtain a reduction product and volatile fume; further gathering compounds of potassium and sodium in the volatile fume, and carrying out sulfuric acid agitation leaching, filtering, impurity removing and evaporative crystallization, thus obtaining a potassium salt and a sodium salt. By means of the method provided in the invention, the high quality ironmaking burden can be prepared, the potassium and sodium content of the ironmaking burden can be reduced, the blast furnace alkali load can be alleviated, and extraction of potassium, sodium and other useful resources can be realized simultaneously.

The invention relates to a calcium oxide material for clean steel smelting and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: mixing 35-40 wt% of limestone particle, 30-35 wt% of limestone fine powder, 8-22 wt% of magnesium aluminum sol and 5-20 wt% of mixture, stirring uniformly, and painting or casting to form, thereby obtaining the calcium oxide material for clean steel smelting. The mixture is formed by mixing alumina micropowder, magnesite fine powder and calcium lignosulphonate in a mass ratio of 10:(3-5):(0.7-1.5); the particle size of the limestone particle is 7-0.1mm, the particle size of the limestone fine powder is 0.05-100 mu m, and the CaCO3 content of the limestone particle and limestone fine powder is greater than or equal to 92 wt%; and the mole ratio of magnesium to aluminum in the magnesium aluminum sol is 1:(0.4-2.2). The calcium oxide material has the advantages of low impurity content, proper strength and almost no influence on total oxygen content of molten steel, can adsorb oxide inclusions in the steel, and is suitable for preparing the working line of a tundish for clean steel smelting.

The invention provides a method for automatic temperature measurement and sampling of a steelmaking converter door, which includes a running mechanism that moves on the ground track in front of the converter door, a suspended furnace front fire door and a temperature measuring and sampling robot that are jointly installed on the running mechanism. Among them, when the temperature measuring and sampling robot is in the standby position, its steel slag splash protection plate and the suspended furnace front fire door form a complete slag splash and high temperature radiation protection baffle; the robot collects real-time image information of the furnace mouth to provide information for operators to maintain the converter , the robot collects the position information of molten steel and slag blocks, and can independently decide and control the extension distance and insertion position of the temperature measurement sampling probe. The invention uses a robot to replace manual temperature measurement and sampling, which can prevent operators from being scalded by steel slag spray and significantly improve the success rate of operations, and is an advanced technology with wide application prospects.

The invention provides a process layout and operation flow of a temperature measuring and sampling robot for steelmaking production and refining treatment, including: a robot running track parallel to the ladle car track, a robot body, a temperature measuring and sampling gun, and a probe storage rack are arranged on the main operating platform , paper tube scraper and steel sample stripping device, the robot moves on the traveling track, and can reach multiple stations, and complete steel temperature measurement, molten steel sampling, paper tube probe insertion, and paper tube scraping at different stations probes etc. The present invention uses industrial robots to replace manual temperature measurement and sampling, avoiding operators being scalded by steel slag spray, and at the same time, using robots to automatically measure temperature and sampling, by controlling the consistency of the depth and position of the measuring point under the liquid steel surface, the accuracy of the detection data is maintained. Stability and consistency are an advanced technology to ensure the quality of steel products.

A method for preparing spherical granular iron for steelmaking, comprising the following steps: crushing and magnetically separating converter waste slag to screen out granular iron with a particle size of less than 15 mm; cleaning the surface of the granular iron; then air-drying or oven-drying; 75% to 90%, and the mass of the binder accounts for 10% to 25% for batching; put the small iron and binder into the mixer for mixing, and make a material ball of 45 to 65mm after mixing. Low-temperature baking; after the low-temperature baking, the temperature of the material ball drops to 35-45°C, and the material ball is pressed into spherical granular iron with a diameter of 40-60mm. The present invention bonds small grains of iron together, enlarges the size of small grains of iron, facilitates the coating of anti-high temperature oxidation materials on the surface of the grains of iron, and prevents the oxidation of small grains of iron in a high temperature environment of steelmaking, resulting in high loss of grain iron , and can be coerced by light and thin scrap steel in the recycling and processing process, so that small iron particles can be effectively recycled.

Provided are acid-corrosion-resistant high-strength low-nickel duplex stainless steel and a manufacturing method thereof. The duplex stainless steel comprises the chemical components by the weight percentage: 0.01-0.06% of C, 0.20-0.50% of Si, 3.0-3.8% of Mn, 21.0-22.0% of Cr, 1.0-1.5% of Ni, 0.15-0.20% of N, 0.40-0.60% of Mo, 2.0-3.0% of Cu, less than or equal to 0.05% of Co, less than or equal to 0.01% of Sn, less than or equal to 0.01% of Pb, less than or equal to 0.5% of the total amount of W, B, Nb, Ti, Co, Al and V, and the balance Fe and inevitable impurities, wherein the ratio of Cu% to Mo% is 5 to 1. The duplex stainless steel has pitting corrosion resistance equivalent to that of S32101 and has acid corrosion resistance superior to that of the S32101, the corrosion resistance in boric acid and other acidic conditions is further improved, the risk of corrosion occurrence is reduced, and the yield strength is increased by 20% or more than that of the conventional S32101; the alloy cost is equivalent to that of the S32101; and ordinary raw materials can be used for smelting products satisfying nuclear power material standards.