41results about How to "Improve steelmaking efficiency" patented technology

The invention discloses a method for smelting ultra-low carbon steel. The method comprises a desulfurization procedure, a converter blowing procedure, an RH vacuum treatment procedure and a continuous casting procedure. After converter blowing, the temperature of tapping is 1680 DEG C-1700 DEG C, then ferroaluminum is added into liquid steel so that the liquid steel is subjected to preliminary deoxygenation; then the temperature is measured, oxygen activity is determined, and the liquid steel is fed with an aluminium wire according to a determined oxygen activity result, so that the oxygen activity is fine-tuned, and it is ensured that the oxygen activity is at 550 ppm-650 ppm; and the liquid steel meeting conditions enters the RH vacuum treatment procedure directly. A high target temperature of the converter tapping, with the partial ferroaluminum deoxygenation conducted after the converter tapping, enables the liquid steel to be kept at a high temperature level, and the temperature level meets the requirement for the temperature when the liquid steel enters the RH vacuum treatment procedure, so that an existing electric heating procedure is omitted; and the liquid steel can enter the RH vacuum treatment procedure directly, so that energy consumption in the steel making process is reduced greatly, and steel making efficiency is enhanced effectively after the heating procedure is omitted.

The invention belongs to the technical field of steel smelting furnaces, and particularly relates to a vacuum steel smelting furnace. A shell, a bottom plate, a feeding box, a first motor, a lead screw, a movable block, a connecting rod, a limiting plate, a fixing plate, a movable plate, a first connecting block, a second connecting block, a fixing frame, a second motor, a belt, a belt wheel, a transmission shaft, a vacuum cavity, an inner furnace, an outer furnace, a seal furnace crown, a vacuum pump, a connecting pipe, a first air cylinder valve, a storage tank, an air blower, a communication pipe, a second air cylinder valve, an air pipe, a feeding pipe, an oxygen inlet pipe, a feeding hopper, a discharging pipe, a stirring cavity, a third motor, a stirring shaft, a casing pipe, a conical barrel, screen holes, a grinding barrel, a stirring bar, a mixing hopper, a material outlet pipe and grinding teeth are included. Through matched communication of the storage tank, the first air cylinder valve, the second air cylinder valve, the connecting pipe and the communication pipe, vacuum pumping is only conducted on the vacuum cavity through the vacuum pump and the air blower, accordingly, rapid vacuum pumping of the vacuum cavity is achieved, the steel smelting efficiency is improved, and heat losses are reduced.

The invention discloses a high-efficiency and energy-saving converter. The high-efficiency and energy-saving converter comprises a converter body. A converter body port lantern ring is fixedly installed on the upper surface of the converter body. An oxygen pipe fixing base is fixedly installed on the inner side of the converter body port lantern ring. An oxygen injection pipe is arranged on the inner side of the oxygen pipe fixing base. A backflow prevention device is fixedly installed on the outer surface of the upper end of the oxygen injection pipe. An oxygen input pipe is fixedly installedon the outer surface of one side of the backflow prevention device. A converter body inner chamber is arranged inside the converter body. A rotary threaded block is arranged on the inner wall of theconverter body. A molten iron pouring nozzle is fixedly installed on the outer surface of one side of the converter body. A molten iron pouring outlet is formed in the inner side of the molten iron pouring nozzle. A pull rod connecting rod is fixed to the outer surface of the other side of the converter body. With the high-efficiency and energy-saving converter, energy consumption is reduced, theefficiency of steel making is improved, the converter body is prevented from shaking, and the converter body is more convenient to use.

A flame gunning technique is a technique method for spraying and mending a lining of a steel refining furnace. The spraying method comprises the steps: heating fire-resistant powder in a material tank to 700-1500 DEG C at the material tank body rotation speed of 0-20 turns / min; connecting the discharge port of the material tank, O2, argon and C2H2 with the tail of a spray gun, and opening the O2, C2H2 and a discharging valve; and sintering the fire-resistant powder into a smelting state by utilizing a focused flame belt of 2500 DEG C, and then spraying. The mending method is basically identical to the operation of the spraying method and specially comprises the steps of: before opening the discharging valve, melting slag on the surface of a part corroded by molten steel by utilizing the focused high temperature of 2500 DEG C and then sintering a cross-shaped groove; and then opening the discharging valve for mending. The fire-resistant powder for flame gunning does not contain water, thus improving the density of a coating and anti-corrosion anti-scouring performance of the coating on molten steel, reducing the thickness of the lining and the motor power of a converter and further achieving the purpose of reducing the cost of each tonnage steels. The flame gunning technique solves the problems that the lining of the steel refining furnace is thick, the motor power of the converter is large and the steel refining furnace needs stopping for mending.

The invention discloses a protective guard for a steel-making furnace. The protective guard comprises a protective guard body, a movable protective guard body, a lifting adjusting device and a conveying device; the protective guard for the steel-making furnace is fixedly installed around the steel-making furnace; the protective guard body is directly and fixedly installed on the ground as a fixed protective guard; and the lifting adjusting device and the conveying device serve as a steel-making material conveying structure and are fixedly installed in the protective guard body. Workers can go in and out through a door of the protective guard, and a ventilation window and a ventilation net are used for guaranteeing air circulation inside and outside the protective guard and lowering the temperature. The building problem of the protective guard is flexibly solved through the movable protective guard body, if a wall for building the protective guard exists on site, the movable protective guard body does not need to be installed, and if no wall is available, the structure needs to be used for building the protective guard. A lining plate and a clamping plate are pushed through an air cylinder on the lifting adjusting device to conduct height adjustment, and therefore materials are driven to ascend and descend. A motor on the conveying device drives a conveying belt and mobilizes rollers to integrally convey raw materials or formed steel.

An oxygen blowing metal hose long in service life comprises a corrugated pipe, and a first joint and a second joint are arranged at the two ends of the corrugated pipe; the outer side of the corrugated pipe is wrapped with a metal net body, and the corrugated pipe is of a five-segment type structure formed by sequentially connecting a first pressure-resisting segment, a first transition segment, a high-flexibility segment, a second transition segment and a second pressure-resisting segment; the first pressure-resisting segment and the second pressure-resisting segment on the two sides of the corrugated pipe are in omega shapes; and the high-flexibility segment located in the middle portion of the corrugated pipe is in a deep-U-shaped wave shape, and the first transition segment and the second transition segment are in U-shaped wave shapes. According to the characteristics that the two sides of the corrugated pipe are bad in working condition and large in bearing pressure, the pressure-resisting segments in the omega shapes are arranged on the two sides of the corrugated pipe; according to the characteristic that due to insufficient flexibility, the dynamic bending portion of the middle segment of the corrugated pipe is prone to being damaged, the middle segment of the corrugated pipe is designed to be the high-flexibility segment in the deep-U-shaped wave shape; and through the improvement, the service life of the oxygen blowing metal hose is greatly prolonged, the maintenance and replacement time is greatly shortened, and improvement of steel smelting efficiency is facilitated.

The invention discloses a method for making foaming slag for electric arc furnace steelmaking using waste plastic and waste rubber, wherein the steps are as follows: The waste plastic and the waste rubber are to be crushed. When the temperature of the slag reaches 1600-1650oC and the limestone is completely dissolved, the pulverized waste plastic and waste rubber and metallurgical grade coke are injected into the slag. At this time, there is a large amount of FeO in the slag layer, and then FeO is reduced by waste plastics and waste rubber and C in metallurgical grade coke to produce Fe and CO gas, and CO gas is trapped by slag to form foam slag. In order to produce a large amount of foaming slag, oxygen-enriched operation is carried out for feeding oxygen. When the O2 content in the slag exceeds the CO equilibrium curve, excessive CO gas is generated. After the CO gas is captured by the slag, a large amount of foam slag is formed. By mixing the waste plastics, waste rubber and metallurgical grade coke, the foaming slag is characterized by improvement of the electric arc furnace steelmaking efficiency, cost reduction of electric arc furnace steel and less environmental pollution.

A production of ferrovanadium concerned with calcium vanadate is carried out by smelting calcium vanadate, Al and ferrous powder at weight ratio of 100: (23-28): (23-27). The said calcium vanadate is selected from m-calcium vanadate, p-calcium vanadate or o-calcium vanadate, one of them at least, with V content of 24-43%. It has high recovery rate and no wastewater pollution.

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises semisteel; lance position of the oxygen lance moves within 1.5-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.95-2.05m, blowing lance position is 1.5-2.2m and catch carbon lance position is 1.7-1.75m; wherein, the auxiliary materials comprise compound slag, lime and high-magnesium lime; in every ton of semisteel, 17-20kg of the compound slag is used, 30-34.5kg of lime is used, 30-34.5kg of high-magnesium lime is used, a total of 43-53 cubic meters of oxygen is blown into the furnace; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when theoxygen blowing content is 0.8-2%; with the method of the invention adopted, steelmaking time can be reduced and slag splashing and drying can be effectively avoided in the process of steelmaking.