208results about How to "Improve furnace life" patented technology

The invention provides a steelmaking and slagging method. The method comprises the following steps of: adding semisteel from which vanadium is extracted into a steel refining furnace; blowing oxygen into the steel refining furnace and blowing; in two minutes after the blowing is started, adding 9 to 11kg of lime, 9 to 11kg of high-magnesium lime, 3 to 8kg of fluxing agent, and 11 to 14kg of acid composite slag into the steel refining furnace based on one ton of semisteel from which vanadium is extracted; and in 9 minutes after the first slag is formed and blowing is started, adding 9 to 11kg of lime and 9 to 11kg of high-magnesium lime into the steel refining furnace based on one ton of semisteel from which vanadium is extracted, and continuously blowing to obtain molten steel and final slag. The fluxing agent is refined steel slag. Slagging is performed by the method, the slag can be formed quickly, the consumption of an iron and steel material is reduced, smelting time is shortened and steelmaking cost is saved.

The invention disclose a production process for melting blister copper in a bath by side-blowing of oxygen enrichment and special apparatuses thereof, the process comprises the steps of melting concentrate of copper, diluting the slug and air refining copper matte, which is to say, adding the material comprising copper, quartz, limestone and fine coal into the furnace of bath and blowing the high pressure oxygen enrichment air into the furnace, the formed copper matte, slug are ceaselessly flowed into a diluting electric furnace, manufacturing acid after recycling waste heat by smoke gas at high temperature; overheating the slug through an electrode and separating the slug from copper matte to obtain the diluted slug and copper matte which is fed into the continuously-air-refining furnace through a chute slipway; reacting the copper matte with arenaceous quartz under the effect of compressed air to obtain the blister copper, performing mineral dressing to the air-refined slug, manufacturing the acid with SO<2>; the invention has less process investment, high heat utilization rate, low energy consumption, good effect of environmental protection, compact apparatus structure, small occupied area, great processing ability, light sticking in air flue, simple operations, diverse measures in adjusting the condition of furnace which is easy to control, high level of mechanization and low labor intensity.

The invention relates to the technical field of heating furnaces of heat treatment equipment applied in the steel rolling industry, in particular to a high-efficiency intelligentized heating furnace control method. The method adopts a PLC (programmable logic controller) system for field control and an upper computer operating system communicating and connected with the PLC system to form an intelligent control system, and moreover, the intelligent control system is utilized to efficiently, scientifically and intelligently control a heat furnace. The method is characterized in that the intelligent control system controls and sets the heating furnace in the following six aspects: (1) furnace temperature control; (2) internal pressure control; (3) air-fuel ratio control; (4) safety protection system control; (5) adoption of an human-machine interface (HMI) on the intelligent control system; (6) history data recording. The method can reasonably control heating temperature, furnace temperature and furnace pressure at each stage in real time, increases the heating utilization rate, has an outstanding effect in saving energy and reducing consumption, increases the production efficiency, reduces the production cost, and prolongs the furnace service life.

The invention discloses a converter lining thickness online testing method and a device thereof. The testing method comprises the following steps: (1) establishing a converter value module by finite element software to perform a steady-state calculation on converter lining temperature and thickness so as to determine distribution of temperature in a converter lining, setting measuring points in a converter body, and obtaining a converter lining temperature-thickness reference table; (2) according to the determined measuring points in step 1, burying thermocouple temperature measuring devices in a lining permanent layer of the converter and the bottom of the converter body; (3) according to data acquired in step 2, combining the converter lining temperature-thickness reference table obtained in step 1 to backward calculate the converter lining thickness; and (4) determining whether to perform repair treatment on the converter lining or not according to the lining thickness obtained in step 3. The device adopted by the invention comprises the converter body (1), and the thermocouple temperature measuring device is arranged in the lining permanent layer (2) of the converter body (1). The method and the device have simple working procedures and high measuring accuracy, and can effectively improve the campaign length of the converter.

The invention discloses a stainless steel wire rod used on a standard part as well as a manufacturing method, the stainless steel wire rod comprises the compositions, in weight percent: C: 0.03 to 0.08, Si<=0.55, Mn: 13.50 to 15.50, P<0.045, S <0.020, Cr: 12.50 to 14.00, Ni: 0.80 to 1.45, Cu: 1.75 to 3.50, balance Fe and unavoidable impurities. The manufacturing method includes the following steps of: 1. adopting an electric furnace plus an AOD secondary refining process for smelting, and continuous casting to form billet, 2. rolling, with a soaking temperature of between 1220DEG C and 1250DEG C, an initial rolling temperature >=1180DEG C, and a finishing temperature of between 950DEG C and 1050DEG C; 3. solid solution heat treatment, with a solid solution temperature of 1050DEG C+-10DEG C, the heat preservation time of 40 minutes, and the heating time of 30 to 60 minutes, and water cooling after exiting the furnace; and 4. acid washing. The wire rod and the manufacturing method reduce the nickel and chromium content and effectively save the nickel resource, and have greatly reduced costs of steel per ton compared with 304HC, and have excellent cold working performance.

The invention relates to an aluminum silicon carbide carbon brick for a torpedo tank and a preparation method thereof. The aluminum silicon carbide carbon brick comprises the raw materials by weight percent: 10-30% of special grade alumina, 15-35% of sub-white fused alumina being 1-3mm, 5-15% of silicon carbide, 2-10% of andalusite, 5-15% of crystalline flake graphite, 5-15% of 325-mesh sub-white fused alumina, 1-10% of nitride, 2-3% of metal aluminum powder and 3-5% of phenolic resin. The aluminum silicon carbide carbon brick is prepared by mixing the raw materials in the proportion, molding and drying. According to the invention, a corundum mullite phase is formed in the process of using the finished product and combined with nitride by adjusting the composition of the raw materials and adding nitride, so that the corrosion resistance, the scouring resistance and the high-temperature volume stability of the brick can be improved; compared with the common Al2O3-SiC-C (ASC) brick, the aluminum silicon carbide carbon brick improves the furnace age by about 15%.

A method for producing high carbon steel through double-slag high drawing carbon tapping belongs to the technical field of smelting high carbon steel through a converter. The method comprises processing steps as follows: molten iron and steel scraps are loaded in the converter according to a certain molten iron ratio; in a first stage of converter steelmaking, the converting is performed at the oxygen supplying intensity of 2.8 Nm<3>/min/t, active lime and ore fluxing mediums are added in the converter, and a larger bottom blown flow rate is adopted to stir; the converting is performed at a standard lance height in the prior period for the converting of the converter, and then the lance height rises gradually; part of furnace slag is dumped through a rocking furnace; in the second stage for the converting of the converter, the converting is performed at the oxygen supplying intensity of 3.3 Nm<3>/min/t, and active lime and the ore fluxing mediums are added in the converter; the lance height rule that the converting is performed at a higher lance height in the later period and the lance height descends stage by stage is adopted; a small quantity of ores and fluorites are added frequently within 80 to 90 percent of total converting oxygen consumption; after the converting of the converter is finished, deslagging is performed through the rocking furnace of the converter, and temperature measurement and sampling are carried out; and converter tapping is carried out. The method has the advantage of overcoming the shortages of serious rephosphoration caused during the tapping process, low production efficiency, and so on.

The invention discloses a manufacturing method of stainless steel mother liquor foam slag through electric furnace dephosphorized molten iron, which comprises the following steps: 1)adding solid material with waste stainless steel, ferrochromium and silicon into electric furnace through material basket; energising to smelt; setting the quantity of siliconat at 8.5-12kg/t; 2)adding dephosphorized molten iron when the power consumption is 15-22 Mwh; controlling C content of mother liquor at 1.50-4.00%; 3)forming basic smelting pond in the furnace when the power consumption is 160-200Kwh/t; starting to blow carbon powder with content at 2-4kg/t; jetting oxygen with quantity at 2500Nm3/h-3500Nm3/h.

The invention belongs to the technical field of ferrous metallurgy, in particular relates to a process for smelting a vanadium-containing molten iron converter, and solves the technical problem of improving the service life of the vanadium-containing molten iron converter. The process comprises two times of slag making, namely in the first time of slag making, reducing the vanadium content of blown molten iron to below 0.03 percent and discharging formed primary slag, and adding slag making materials in the converter for the second time for smelting. Slag with high vanadium content and phosphor content formed in the first time of slag making is removed possibly, and converter slag which has high melting point and low oxidability and is suitable for slag splashing is formed in the second times of slag making, so that the service life of the vanadium-containing molten iron converter is obviously improved. The method not only can effectively ensure smooth operation of the converter steel making process, but also can produce converter slags more suitable for slag splashing to greatly improve the service life of the converter.

The invention discloses a silicon nitride-silicon carbide composite brick, comprising, by weight, 43 to 80% of silicon carbide sand, 5 to 19% of industrial silicon, 3 to 15% of micro silica powder, 10 to 20% of silicon nitride, 0.5 to 3.5% of a transforming agent, 0.5 to 4% of a toughening agent, 0.5 to 3% of a binder and 0.1 to 1% of an additive. Meanwhile, the invention further discloses a preparation method for a ceramic refractory material, i.e., the silicon nitride-silicon carbide composite brick. The ceramic refractory material provided by the invention has the advantages of novelty, creativity, advancement, practicality, wear resistance, anti-stripping performance, strong acid and alkaline resistance and substantial effects on matching of a monolithic lining and prolongation of an integral furnace age. The preparation method provided by the invention is simple, uses nitrogen and other nitrides in the air as sintering protection gas in the process of preparation, discharges oxygen in the air, thereby increasing a local oxygen-containing rate, and is beneficial and harmless to the natural environment and suitable for energetic popularization.

The present invention discloses one kind of alumina-silicon carbide-carbon brick for torpedo tank and the torpedo tank lining structure therewith. The alumina-silicon carbide-carbon brick is produced with the materials including bauxite 10-60 wt%, electromelting corundum 10-50 wt%, silicon carbide 3-20 wt%, graphite 2- 20 wt%, chrome 0.5-5 wt%, metal aluminum 0.2-3 wt%, metal silicon 0.2-3 wt%, binding agent 3-5 wt% and andalusite 3-10 wt%. The brick is suitable for use in torpedo tank, and has high iron slag erosion resistance, high antioxidant capacity and high heat shock stability.

The invention discloses a process for producing an anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining. In the process, the composition of molten steel is controlled by converter smelting and RH-LF-RH refining process, so as to produce a low-carbon low-sulfur anti-acid (hydrogen-induced cracking HIC and stress corrosion cracking SCC resistant) pipeline steel. The specific flow is as follows: pre-desulphuzation of molten steel - converter smelting-primary RH vacuum refining - LF refining desulphuzation - secondary RH vacuum refining - continuous casting. By the secondary RH vacuum refining process, the decarburization burden of the converter and the oxidability of the molten steel can be reduced, and the adverse effect caused by recarburization in the LF refining process can be eliminated; furthermore, the use of a strong deoxidizer is reduced, the production is stabilized, and the composition of the molten steel is ensured to be controlled within a production target stably to meet the control requirements of the anti-acid pipeline steel on the low-carbon low-sulfur and high-purity composition. The carbon content of the finished steel produced by the process of the invention can be stably controlled to be 0.03% to 0.04%, and the sulfur content is stably controlled to be less than or equal to 0.0010%.

The invention discloses a method for smelting high-manganese stainless steel through AOD. The method comprises a preparatory process, a decarburization process, a prereduction process and a reduction process, wherein in the prereduction process, a ferrosilicon alloy serves as a deoxidizing agent and an alloying agent for deoxidization, manganese is added in a concentrated manner for manganese alloying, manganese is added in a batched manner in the manganese alloying process, heating is conducted while manganese is added, and meanwhile various technological parameters are reasonably controlled. According to the method for smelting the high-manganese stainless steel through AOD, for AOD smelting on the high-manganese stainless steel with the manganese content larger than 15%, the manganese alloying technology is improved, furnace temperature, an oxygen blowing parameter and the using dosage and time of the deoxidizing agent and the alloying agent are reasonably controlled, oxidization or burning loss of manganese are greatly reduced, and not only is the recycling rate of manganese increased, but also the loss, caused by high temperature, of an AOD furnace lining is reduced. The invention further discloses an AOD furnace. Installing of a bottom air blowing tube can be convenient to achieve, pouring of the AOD furnace is uniform and adjustable, slag flowing is uniform and capable of saving labor, the workload is reduced, the slag flowing speed is increased, the slag flowing quality is improved, and the manganese alloying process is accelerated.

The present invention relates to fiberglass loose-fill insulation that is insensitive to the content of boron in the composition of the glass. It has been discovered that the level of boron in the glass used for the manufacture of loose-fill glass wool can be substantially reduced without degrading thermal performance. The lowered amount of boron provides for a lower cost batch composition and increased furnace life. The glass composition of the present invention includes a substantially reduced content of boron and preferably an increased amount of sodium dioxide. The primary phase of these glass compositions is typically devitrite (Na₂Ca₃Si₆O₁₆). The glass of the present invention provides a glass fiber blowing wool that does not require an increase in pack density to compensate for the reduced boron content while achieving the similar thermal conductivity. The glass of the present invention is also suitable for use in acoustic insulation.

The invention relates to a glass tank for melting high-boron low-alkali or alkali-free glass and manufacturing a TFT-LED glass substrate. The glass tank comprises a heating system matched with the glass tank and is characterized in that: the internal structure of the glass tank comprises a pre-melting tank with a feed inlet, a cross flame melting tank connected with the pre-melting tank, a cross flame clarification tank communicated with the cross flame melting tank through a lower passage of a flow-limiting diaphragm wall, and a cross flame work pool communicated with the cross flame clarification tank through a pipeline; and a forming passage for delivering molten glass is formed on the cross flame work pool. The glass tank reasonably utilizes energy; and the generated molten glass has the advantages of quick temperature rise, uniformity and high defoaming efficiency.