41results about How to "Efficient dephosphorization" patented technology

The invention relates to the field of smelting, in particular to a converter less-slag smelting method. During smelting, double slag and remaining slag operation are combined, the technological process comprises the steps of slag splashing for protection of a converter, converter slag solidification, converter slag solidification confirmation, scrap steel adding, iron adding, converter smelting slagging, dephosphorization slag putting in the early stage, gun lowering for blowing and decarburization again, steel tapping and slag remaining; the thermodynamic condition that the early-stage temperature is low and is beneficial to the dephosphorization reaction is utilized, the upper converter final slag is used in the initial stage of lower converter blowing, dephosphorization is carried out,before the temperature rises to be adverse to dephosphorization, part of the converter slag is poured out, then slag charge is added for slagging, second-stage blowing is carried out, dephosphorization is further carried out; and a low-lance-position and large-oxygen-supply converter efficient dephosphorization technology is adopted, and sufficient deslagging is carried out after dephosphorizationis finished. According to the converter less-slag smelting method, through the application of the double slag-remaining slag and remaining slag processes, an obvious effect is obtained, the ash consumption of the converter is greatly reduced, and the slag amount is reduced.

The invention discloses a method for smelting medium-high alloy low-phosphorous steel through an electric furnace with a high molten iron proportion. Through strictly control over oxygen blowing, power transmission and feeding processes during smelting of the electric furnace, the purposes of efficient smelting, energy saving and consumption reducing are achieved. The method includes the detailed steps that the proportion of molten iron entering the furnace is controlled to be 60-80%, steel scraps are added into the furnace at a time through a basket, the molten iron enters from a door of the furnace through a molten iron adding trolley during power transmission, the flow of a multifunctional bundling oxygen lance is reasonably adjusted, power supply time is dynamically controlled, lime is supplemented into the furnace in batches in combination with an automatic feeding system, and therefore molten steel rapidly meets the requirements for components and temperature needed by a steel grade. Compared with a common electric furnace technology, the time consumed for adding the molten iron is shortened, and the smelting efficiency of the electric furnace is improved; the power supply time of the electric furnace is quite short, and therefore the energy consumption of steel smelting is lowered; during smelting of the electric furnace, efficient dephosphorizing and decarbonizing are achieved.

The invention relates to a dephosphorization method for molten iron in a converter by blowing dust removal ash and belongs to the technical field of steelmaking. According to the dephosphorization process for dephosphorizing molten iron in the converter by blowing lime powder and dust removal ash through a dephosphorization oxygen lance, the device used in the dephosphorization process comprises an oxygen supply system and a powder blowing system; during the method, the oxygen supply system and the powder blowing system are adopted, the lime powder and dust removal ash are blown into a molten tank through the top-blowing dephosphorization oxygen lance, since the dust removal ash contains relatively high content of iron oxides, the content of ferric oxide in slag can be rapidly increased so as to promote the dissolution of lime and rapidly form slag having relatively high dephosphorization capability, the dephosphorization reaction is accelerated and meanwhile, the efficient utilization of the dust removal ash is achieved, the environmental secondary pollution due to the wastes is avoided and the dephosphorization method has relatively high economic and social benefits.

The invention discloses a preparation method and application of a eutrophic lake sediment phosphorous adsorbent. The preparation method comprises the following steps: 1) immersing clay minerals into ahydrochloric acid solution and heating and stirring in a water bath; controlling the temperature in a certain range and washing until the solution is neutral; 2) immersing into a sodium carbonate solution; heating and stirring in the water bath; controlling the temperature in a certain range and washing with distilled water until the solution is neutral; drying for a certain time in a certain drying range; 3) roasting in a muffle furnace for a certain time under the condition that the temperature is 350 to 450 DEG C; cooling to room temperature to obtain the eutrophic lake sediment phosphorous adsorbent. The invention also provides application of the adsorbent in lake endogenous phosphorous controlled ecological rehabilitation engineering. The adsorbent disclosed by the invention is low in cost, environmentally friendly and good in adsorbent effect, and contains various macro-elements and microelements which are beneficial to the growth and development of organisms; the adsorbent is good for field planting and propagation of water plants and stabilization of a water environment; efficient phosphorous removal of eutrophic lake sediment can be realized, and the endogenous phosphorous pollution problem of a eutrophic lake is effectively controlled.

The invention discloses a biopharmaceutical wastewater treatment device adopting ultrasonic inactivation, which includes a sump pool, a regulating pool, a biological contact oxidation pool and a filter. In the sump pool, an S-shaped waste water channel is arranged through a partition, and in the pool The upstream of the waste water channel in the pool is provided with an inlet for collecting waste water and a grille is installed, an overflow outlet is set in the downstream of the waste water channel in the sump and is connected to a regulating pool through a pipeline, and the layout of intervals in the waste water channel is arranged in the sump There are plate ultrasonic generators. The biopharmaceutical wastewater treatment device using ultrasonic inactivation of the present invention can effectively kill microorganisms in the wastewater by utilizing the mechanical effect, thermal effect and cavitation effect generated by ultrasonic waves in the water body, and degrade organic substances such as halogenated hydrocarbons and aromatic hydrocarbons in the water. And effectively inactivate the virus in the wastewater.

The invention discloses a method for producing calcium ferrite from iron oxide. The method utilizes an iron electrode to realize electric smelting, utilizes the iron electrode to produce calcium ferrite, prevents an additional component from entering into calcium ferrite, improves calcium ferrite purity and realizes better calcium ferrite actual use effects. In steel-making, through use of the calcium ferrite obtained by the method, a slagging rate is fast, dephosphorization efficiency is high, a lime use amount is reduced, fluorine-free steel-making is realized and environmental pollution is reduced.

The invention discloses a method for producing calcium ferrite from iron ore. The method utilizes an iron electrode to realize electric smelting, utilizes the iron electrode to produce calcium ferrite, prevents an additional component from entering into calcium ferrite, improves calcium ferrite purity and realizes better calcium ferrite actual use effects. In steel-making, through use of the calcium ferrite obtained by the method, a slagging rate is fast, dephosphorization efficiency is high, a lime use amount is reduced, fluorine-free steel-making is realized and environmental pollution is reduced.

The invention relates to a high-efficiency dephosphorization accelerator suitable for converter steelmaking and its preparation method. The innovation point is that the converter steelmaking dedusting ash is used as the base material, and its high iron oxide components and active calcium oxide components are effectively used. Recycling and recycling of waste resources in steel mills, while introducing active BaO materials, the barium phosphate formed by BaO has stronger thermodynamic stability than calcium phosphate, forming a high oxidizing, high An alkaline dephosphorization accelerator with a low melting point can realize the purpose of supplementing FeO in the converter steelmaking process and forming a stable dephosphorization product, so as to enhance the dephosphorization efficiency and finally achieve high-efficiency dephosphorization. This method can save more than 30% of the cost and dephosphorization The efficiency is about 5‑10% higher than that of traditional dephosphorization agents. At the same time, the product of the present invention effectively protects the environment, saves energy, realizes the high-efficiency utilization of resources in "turning waste into treasure" of solid waste in steelworks, obtains better economic and social benefits, and is suitable for popularization and use.

The embodiment of the invention provides a method for reducing the smelting cost of Q460C-2 low-alloy steel. The method comprises the steps that final slag obtained after slag splashing treatment in a furnace is completely left in the furnace for smelting of the furnace, and 30-35 tons of waste steel and 170-180 tons of molten iron are added into the furnace for smelting, wherein the target of the final slag is that the alkalinity is 3.0-3.5, the TFe content is 18-25%, and the MgO content is 7-9%. Through the two aspects of early-stage dephosphorization and later-stage dephosphorization, the purpose of efficient dephosphorization is achieved through early-stage low temperature and large slag amount and later-stage high oxidability, high alkalinity and large slag amount, and a guarantee is provided for further replacing metal manganese with silicon-manganese alloy and further reducing the smelting cost.