37results about How to "Shorten the smelting process" patented technology

A zinc leaching slag treatment method comprises the following steps: 1) The dried zinc leaching slag is evenly mixed with coke powder, and then the mixture is added to a volatilization kiln through a feeding scraper-trough conveyer at the tail of the kiln; 2) under the high-temperature condition of the volatilization kiln, the mixture generates kiln slag and smoke, valuable metals in the zinc leaching slag are deoxidize, as a result, lead and zinc steam is generated and gathered in the smoke, and gold, silver and copper enters to the kiln slag; 3) the kiln slag is delivered to a smelting furnace, furnace burden is added from the top of the smelting furnace, oxygen-enriched air is blown through an oxygen lance, the furnace hearth is stirred, the smelting temperature of the smelting furnace and the ratio of oxygen quantity to kiln slag dry measure are controlled, and slagging smelting is completed; 4) after the slagging smelting carried out in step 3), the valuable metals gold, silver and copper in the kiln slag are gathered in matte, the generated lead steam is gathered in smoke, and the kiln slag is cooled gradually. According to the zinc leaching slag treatment method, the technological process is short, the energy consumption is low, the cost is low, and the valuable metal recovery rate is high.

A method for dephosphorizing and preserving vanadium in vanadium-phosphorus molten iron, mainly comprising the following steps: (1) draining vanadium-containing and phosphorus-containing molten iron produced in a blast furnace or non-blast furnace into an induction furnace; Phosphorus slag and CO injection 2 , top blowing, bottom blowing, side blowing or top-bottom re-blowing can be used; (3) When the phosphorus content in the vanadium-phosphorous iron water drops below 0.03%, the blowing is stopped and the slag is separated from the molten iron. After the molten iron containing vanadium and phosphorus is treated by the method of the invention, when the phosphorus content is reduced to the requirement of vanadium steel, the loss rate of vanadium in the molten iron is less than 10%, achieving the effect of dephosphorization and vanadium preservation. In the present invention, by injecting CO 2 Realized the selective oxidation of molten iron containing vanadium and phosphorus and CO 2 The utilization of resources reduces the smelting process of vanadium steel.

The invention provides a one-step commercial molybdenum oxide leaching method. The method comprises an operation of adding an oxidizing agent, an alkaline leaching agent and a phosphoric acid compoundinto ore pulp with commercial molybdenum oxides in steps under constant pressure so as to realize efficient leaching of commercial molybdenum oxides, wherein the oxidizing agent is sodium hypochlorite or bleaching powder, alkaline is sodium hydroxide or ammonium hydroxide, and the phosphoric acid compound is phosphoric acid, sodium phosphate or ammonium phosphate. According to the one-step alkaline leaching method, the oxidizing agent, the alkaline leaching agent and the phosphoric acid compound are added in steps, so that the original low-price molybdenum which is difficult to leached by alkaline is oxidized into high-price molybdenum which is easy to leach, and adverse effects, on commercial molybdenum oxide leaching, of transition metal impurities are counteracted at the same time, thereby realizing one-step efficient leaching of the molybdenum. Compared with the prior art, the method has the advantages that the smelting procedure is greatly shortened, the processing cost is reduced and the once leaching rate of the molybdenum is above 98%.

The invention provides a method for smelting high-grade pipe line steel with a RH single-link process. During a converter tapping process, high aluminum content in molten steel is controlled, such that desulfurization and impurity control in subsequent refining process can be benefited. During an RH vacuum refining stage, a desulfurization agent is added, and S content in the molten steel is controlled no higher than 0.0020%; oxygen blowing is carried out upon the molten steel, and a reaction is carried out between oxygen and aluminum in the molten steel, such that aluminum content in the molten steel is controlled at 0.03-0.05%. Also, heat loss during the desulfurization process is supplemented, and the impurity is converted into mainly clustered Al2O3 impurity which is easy to remove; and calcium treatment and soft blowing are carried out, such that the impurities in molten steel is mainly CaS impurities of small particles with deformation coefficient close to 1. According to the method provided by the invention, X80 pipeline steel quality requirement can be achieved, production process flow is short, and cost can be substantially reduced.

The invention discloses a method for smelting a high-grade scrap copper by an anode furnace. The method for smelting the high-grade scrap copper by the anode furnace employs a rotary anode furnace facility for smelting. The rotary anode furnace comprises a furnace body, a feed port arranged in the middle portion at the front end of the furnace body, a combustor arranged on an end wall of the furnace body, ventilating bricks arranged at the lower end of the furnace body, and an oxide reduction pipe as well as a casting port arranged at the rear end of the furnace body; the furnace body is able to rotate in 360 degrees. The smelting method comprises the steps as follows: A, a feeding and melting stage; B, an oxidization slagging stage; C, a slag discharging stage; D, a reduction stage; and E, a casting stage. The invention solves the problem that, in the existing treatment technologies of the high-grade scrap copper, the raw materials are poor in adaptation, great in environmental contamination, low in automation degree, and the like.

The invention relates to an air brick with a high blowing through rate and a manufacturing method thereof. The air brick is composed of the following components: coarse corundum with granularity greater than 0.5mm and smaller than or equal to 1 mm and mass fraction of 35-50%; fine corundum with granularity greater than 0 and smaller than or equal to 0.5 mm and mass fraction of 25-40%; alumina fine powder with granularity greater than 0.020 mm and smaller than or equal to 0.044 mm and mass fraction of 8-15%; alumina micro powder with granularity greater than 0 and smaller than or equal to 0.020 mm and mass fraction of 5-10%. The manufacturing method comprises the procedures of mixed milling, material kneading and press forming, and further comprises the procedures of roasting, high temperature sintering, flow detecting, steel shell packaging and the like. According to the air brick provided by the invention, the particle size distribution and the machine pressing pressure are controlled, and uniformly distributed and mutually communicated micropores are formed in a brick body after high temperature sintering so as to achieve the permeability of an air brick body material.

The invention relates to a steelmaking device and a steelmaking method. The steelmaking device comprises a reducing gas processing device and a smelting device, wherein the smelting device comprises a prereduction area, a soft melting area and a fusion area which are sequentially communicated, the fusion area is provided with an electrode and a flux spray gun, the reducing gas processing device is provided with an air inlet pipe and an exhaust pipe, the air inlet pipe is communicated with the soft melting area, and the exhaust pipe is communicated with the prereduction area. According to the steelmaking method, reducing gas is used for prereducing pellets or sintering ore materials, arc heat generated by the electrode is used for heating and melting the prereduced metallized pellets, high temperature flue gas generated in the process is used for deeply preheating and reducing the metallized pellets, and the flux sprayed by the spray gun is used for refining the molten steel. The steelmaking processes are reduced, middle steps of transporting materials are saved, the investment and production cost are lowered, the resource and energy consumption is lowered, emission of harmful gases is reduced, and the steelmaking device and the steelmaking method have very high economic value, environment protection property and social benefits.

The invention relates to a smelting and casting method for titanium-contained metal. The method comprises the following steps that ingredient calculation is calculated, and specifically, ingredient calculation is carried out according to the component content requirement of an alloy and the component content in all raw materials; an alloy bag is made, specifically, according to an ingredient calculation result, a required intermediate alloy and required elementary substances are weighed, and the alloy bag is made; electrode pressing is conducted, specifically, a main raw material is used for being wrapped around the alloy bag and is pressed into an electrode, and the end, close to the electrode, of the alloy bag can be exposed; induction smelting is carried out, specifically, the pressed electrode is baked in a furnace, and is inductively smelted into a titanium-containing metal liquid according to the matched vacuum and / or argon filling condition and an induction power loading curve;and casting is conducted, specifically, the superheat degree of the smelted titanium-contained metal liquid is improved, and the metal liquid is cast to form the titanium-contained metal. According tothe smelting and casting method for the titanium-contained metal, the smelting process flow of the titanium-contained metal can be shortened, an alloy ingot with high uniformity and high mechanical property can be obtained through single smelting, and the direct casting can be conducted through single smelting.

The invention relates to a comprehensive recovery device and process for various nonferrous metal materials. According to the comprehensive recovery device for the various nonferrous metal materials, a reduction furnace, a fuming furnace and a converter which are used for working procedures of recovering lead, zinc and copper are connected into a whole through thermal insulation external crucibles. The process has the characteristics of feeding at a time and continuous output of lead bullion, raw copper and zinc oxide. The comprehensive recovery device and process have the beneficial effects that raw materials are input at a time, all valuable metalsare extracted and purified, the working procedure of smelting is omitted, the production cycle is shortened, and the smelting process is simplified; heat energy in the smelting process is fully used, heat energy is greatly saved, and energy consumption is reduced; and the cost is saved for enterprises, the economic benefits are increased for the enterprises, the production cost is lowered for the enterprises, and the one-time fixed asset investment is reduced for the enterprises.