88results about How to "Meet process requirements" patented technology

The invention discloses a smelting method for directly recycling 120-ton converter dry dedusting coarse particles to a converter. The method comprises the following steps: after slag splashing of steel on a converter is finished, shaking the converter to 90-120 degrees for slag spreading operation, and simultaneously reducing the air speed of a primary dust removal fan of the converter to be below 700 revolutions per minute; the converter is shaken to the temperature of 45-55 DEG C, 15-25 tons of waste steel is added, after the waste steel is added, the converter is shaken to the zero position, and 500-1000 kg of converter dry dedusting coarse particles are added; the wind speed of the dust removal fan is increased to gt; the rotation speed is 1400 r / min; shaking the converter to the tapping surface to-20 DEG C to-40 DEG C, and spreading out the dry dedusting coarse particles of the converter again; and the converter is shaken to 40-50 DEG C, 105-115 tons of molten iron is added, and after iron adding is completed, the converter is shaken to the zero position, and then blowing is started. The method effectively solves the technical problem of foam splashing in the earlier stage of converter smelting caused by direct recycling of the converter dry dedusting coarse particles, can meet the steel grade process requirements, can reduce cost, improve efficiency, save energy, reduce consumption and reduce waste emission, and has good popularization and application values.

The invention provides a semiconductor process chamber and semiconductor process equipment. The semiconductor process chamber comprises a chamber and a gas injector, an inner cavity is defined by the cavity wall of the cavity, the cavity wall is provided with a first channel, the first channel is provided with a first opening, the first channel is communicated with the inner cavity through the first opening, the surface of the first channel comprises a first surface, and the first surface faces the first opening; the gas injector comprises a connecting part, and the connecting part is connected with the cavity and located in the first channel; the gas injector is provided with a gas flow channel, the gas flow channel penetrates through the surface of the connecting part and forms a gas outlet, the gas flow channel is communicated with the first channel through the gas outlet, and the gas outlet is opposite to the first surface and is spaced from the first surface. The semiconductor process equipment comprises a gas source and the semiconductor process chamber, and the gas source is connected with one end, deviating from the chamber, of the gas injector. The pre-mixing channel is arranged on the cavity wall of the cavity, so that the process gas can be fully pre-mixed, and the material processing precision is improved.

The invention relates to the technical field of organic synthesis, in particular to a method and device for preparing 4-methyl-1-pentene, and the method comprises the following steps: (1) pretreating a raw material containing propylene and an inert substance, and carrying out heat exchange on the obtained refined raw material to obtain a heat-exchanged raw material; (2) carrying out dimerization reaction on the raw material subjected to heat exchange and a catalyst in the presence of inert gas, wherein the obtained reaction product is divided into a part of reaction product and a residual part of reaction product; (3) cooling the part of the reaction product as a heat exchange medium, and carrying out heat exchange with the refined raw material to obtain a heat-exchanged product; (4) separating a mixed material of the rest reaction product and the product after heat exchange to obtain a light component and a heavy component; and carrying out rectification on the heavy component to obtain the 4-methyl-1-pentene. According to the method, by controlling the reaction temperature rise, the stable reaction temperature and the uniform reaction process are ensured, and the raw material conversion rate and the product selectivity are further improved.

The invention discloses a Y-direction adjusting device for a rear supporting arm supporting leg of a chassis line lifting appliance. The Y-direction adjusting device is used for adjusting and positioning the Y-direction position of a supporting block of the rear supporting arm supporting leg of the lifting appliance. Comprising a mounting frame, a Y-direction feeding mechanism, a Y-direction pin adjusting mechanism base, a Y-direction pin adjusting mechanism, a first laser range finder, a second laser range finder and a PLC. The installation frame is fixed to the side of a lifting appliance pin adjusting station of a chassis lifting appliance conveying line. The Y-direction feeding mechanism is fixed on the mounting frame; the Y-direction pin adjusting mechanism base is connected to the Y-direction feeding mechanism and is driven by the Y-direction feeding mechanism to move in the Y direction. The Y-direction pin adjusting mechanism is fixed to the Y-direction pin adjusting mechanism base and used for being connected with the lifting appliance rear supporting arm supporting leg supporting block. The first laser range finder is arranged on the outer side of the mounting frame and used for detecting the position of a supporting block of a rear supporting arm supporting leg of the current lifting appliance. The second laser range finder is arranged on the mounting frame and used for detecting the current operation position of the Y-direction pin adjusting mechanism base. The PLC is in control connection with the Y-direction feeding mechanism, the Y-direction pin adjusting mechanism, the first laser range finder and the second laser range finder.

The utility model relates to full-automatic equipment for producing an FTTR antenna, which comprises a rack, a circulating reflux mechanism, and an automatic wire feeding and cutting mechanism, a first half-stripping mechanism, a first tin dipping and soldering aid mechanism and a wire harness turning mechanism which are arranged on the front side of the circulating reflux mechanism and are sequentially arranged along the wire harness processing direction, and the secondary length control mechanism, the second half-stripping mechanism, the second tinning weld-aid mechanism, the original point adjusting mechanism, the first middle stripping mechanism, the third tinning weld-aid mechanism, the second middle stripping mechanism and the material receiving mechanism are arranged on the rear side of the circulating backflow mechanism and are sequentially arranged in the wire harness processing direction. According to the utility model, the processes of stripping the outer skin at the two ends of the antenna, stripping the braid, stripping the insulation, applying the soldering flux, wetting the tin, half stripping the outer skin in the middle of the antenna, half stripping the braid, applying the soldering flux and wetting the tin are integrated in the equipment, so that the full automation of the whole antenna processing is realized, the process requirements are met, and the subsequent use requirements of products can also be met; the traditional manual and semi-automatic processing technology is changed, and the method can be widely applied to the field of antenna processing.

The embodiment of the present application discloses a method and device for optimizing the flatness of a dielectric layer. The method is used for an integrated circuit device. The surface of the integrated circuit device is divided into a dense area and an open area. There are device protrusions in the dense area, and there are no device protrusions in the open area. The method includes: performing a film forming process on the integrated circuit device to generate a dielectric layer and a first grinding layer; performing a flattening process on the first grinding layer to obtain a first grinding surface, and the treated first grinding surface is located between the dielectric layer and the first grinding layer; etching the first grinding surface based on the etching ratio of the dielectric layer and the first grinding layer to obtain a second grinding surface, and the second grinding surface is located in the dielectric layer, and the flatness of the grinding surface is greater than the flatness threshold. The technology provided by this solution can minimize the global drop of the dielectric layer, which not only meets the process requirements, but also greatly increases the subsequent process window.

The utility model discloses an anisotropic conductive film pasting machine, including ACF pasting machine body, the outer wall fixed connection of ACF pasting machine body has workstation, the top fixed connection of workstation has back type support spare, the top fixed connection of back type support spare has the guide plate, the top of guide plate is equipped with two T type long grooves, and the inner wall of two T type long grooves all are connected with T type block slidingly. The utility model discloses a plurality of connecting rod pressing mechanism of electric push rod drive, and the stable fixing of substrate is realized through the synchronous down pressure of four rubber sleeves, effectively prevents the displacement problem in the process of pasting, and significantly improves the pasting accuracy, and T type long groove and T type block sliding structure cooperation movable pasting board, realize the quick adjustment of substrate position, satisfy the technological demand of different pasting position, adopt the cooperation of sliding slot type L type board with adjustable nut, make two L type boards can be according to different size substrate flexible adjustment fixed position, and the equipment adaptability is improved greatly.

This utility model relates to an ammonia fuel regenerative combustion device, belonging to the field of energy conservation and emission reduction. It includes an ammonia fuel regenerative chamber and a combustion-supporting chamber, both connected to the furnace via connecting ports. The ammonia fuel regenerative chamber is equipped with a three-way reversing valve for introducing ammonia fuel and discharging flue gas. The ammonia fuel regenerative chamber contains an ammonia cracking regenerative body, a denitrification reducing agent injector, and a denitrification regenerative body. The porosity of both the ammonia cracking and denitrification regenerative bodies gradually decreases along the flue gas outflow (ammonia inflow) direction. The combustion-supporting chamber has a combustion-supporting gas inlet. The angle of the denitrification reducing agent injector is adjustable. An ammonia cracking catalyst is mounted on the ceramic skeleton of the ammonia cracking regenerative body. An SCR reduction catalyst is mounted on the ceramic skeleton of the denitrification regenerative body. This utility model can improve flame stability, increase ammonia cracking efficiency and denitrification efficiency, and reduce NO₂ levels in the combustion device. x Emissions will be reduced to achieve zero carbon emissions from the heating furnace.

An induction heating execution device for rollers comprises a rack arranged on one side of a set of rollers in the radial direction, a transverse sliding rail is arranged on the upper surface of the rack, the length direction of the rack and the length direction of the transverse sliding rail are parallel to the axial direction of the rollers, and transverse driving mechanisms are arranged on the two sides of the rack in the width direction respectively. Two parallel longitudinal driving mechanisms are arranged on the sliding rail in a sliding mode, the transverse driving mechanism and the longitudinal driving mechanisms both adopt a numerical control electric driving motor and lead screw transmission mode, synchronous control can be achieved through a servo controller, and transverse and longitudinal accurate movement of a heating terminal of the frequency conversion induction heating execution device is driven. An induction heating module is arranged on the upper surface of the longitudinal driving mechanism, when the induction heating terminal is close to the magnetic conductive working face, the heating effect can be generated by induction frequency conversion electromagnetic eddy current, and therefore the process requirement is met, the structure is simple, cost is low, modular installation is achieved, and reliability and working efficiency are high.

This invention provides a painting production line for automotive control arms, belonging to the field of automotive parts processing technology. It includes a frame, a circulating traction mechanism, a preheating furnace, a painting mechanism, and a baking furnace. The circulating traction mechanism includes two parallel traction chains, with several horizontal tie rods evenly spaced between them. The tie rods are rotatably connected to the chain link pins of the traction chains. The traction chains are pulled by several guide sprockets to form a preheating straight section adapted to the preheating furnace, a first vertical painting traction section, a horizontal painting traction section, a second vertical painting traction section, and a baking straight section adapted to the baking furnace. The preheating straight section, the horizontal painting traction section, and the baking straight section are all in a horizontal traction state. The first and second vertical painting traction sections are parallel and vertical. The tie rods are equipped with hangers for suspending workpieces. Workpieces are loaded before the preheating straight section and unloaded after the baking straight section. This invention has the advantages of low energy consumption and high efficiency.

The utility model discloses a continuous rolling spot breaking type paper bag machine which comprises an unwinding mechanism, a bottom edge gluing mechanism, a side edge gluing mechanism, a paper bag cylinder forming mechanism, a bottom glue heat sealing mechanism and a winding mechanism which are sequentially arranged, the bottom edge gluing mechanism comprises a bottom glue drying part, and a bottom edge gluing part is arranged in front of a side edge gluing part. A spot breaking mechanism is arranged in front of or behind the paper bag cylinder forming mechanism, and spot breaking lines which are transversely and equidistantly arranged on the roll material are formed by the spot breaking mechanism. Paper roll materials are subjected to unwinding, bottom edge gluing and drying, side edge gluing, paper tube forming, bottom glue heat sealing and winding, before or after the paper tube forming, the point breaking knife roller conducts point breaking on the materials, the process requirements are met, the production cost is reduced, subsequent paper bag separation is facilitated through point breaking lines, and the paper bag production efficiency is improved. And the rolling mechanism rolls the multiple paper bags, and storage is convenient.

The invention discloses a production system of alkali sedge slices, and relates to the technical field of alkali sedge slice production; in order to reduce the number of loading and unloading times; the system comprises a holding tank, a cleaning device and a crushing device, a mounting frame is installed between the cleaning device and the crushing device, a switching motor is fixed to an outer wall of one side of the mounting frame, and a rotating main shaft is connected to the output end of the switching motor; the ingredients of the alkali sedge slices include 80 to 100 parts of main materials and 25 to 45 parts of auxiliary materials by weight; wherein the main material is alkali sedge tender shoots, and the auxiliary material is a mixture of one or more of winged alkali sedge leaves and alkali sedge seeds. The present invention arranges a holding tank, an impeller and a tool mechanism, first places the material to be processed in the holding tank, and can adjust the position of the holding tank based on the work of the switching motor, thereby realizing the conversion of the holding tank on the cleaning work position and the crushing work position, and the whole process does not need to repeatedly load and unload materials, thereby improving convenience and practicality.

The utility model relates to the technical field of sewage treatment, and discloses an activated carbon adding device. Comprising a feeder shell and further comprises a discharging port formed in the bottom of the feeder shell, a discharging pipe is arranged at the bottom of the discharging port, a pneumatic flange type eccentric semi-ball valve is arranged at the bottom of the discharging pipe, and a discharging pipe is arranged at the bottom of the pneumatic flange type eccentric semi-ball valve; particle impurities in powdered activated carbon are filtered through the filter screen, the filter screen can be pulled out by pulling the pull plate, the filter screen can be detached and replaced, the handle is rotated to drive the rotating rod to rotate, the filter screen is knocked by the connecting rod, and the filter screen is separated from the filter screen. Activated carbon adhered to the filter screen is knocked and removed, material waste is reduced, material backflow can be prevented through the pneumatic flange type eccentric semi-ball valve, and material retention can be avoided.

This invention provides a design method for a four-way valve-controlled AGC cylinder for planar shape control in medium-thick plate rolling mills, relating to the fields of hydraulic control and mechanical design technology. The method first calculates the piston diameter of the AGC cylinder based on the maximum rolling force of the mill and the maximum design working pressure of the AGC cylinder. The calculated piston diameter is then rounded upwards to determine the piston diameter D. Next, based on the relationship between the steady-state retraction speed of the AGC cylinder and the piston rod diameter, and the piston diameter D, the piston rod diameter is calculated. A lower limit for the piston rod diameter is calculated based on the strength requirements of the piston rod during rolling. Finally, the final piston rod diameter d is determined by the larger of the calculated piston rod diameter and the lower limit. The AGC cylinder designed based on this invention is beneficial for meeting the process requirements of hot rolling planar shape control and improving production line efficiency.

The utility model relates to the technical field of grinding equipment, and discloses a manual grinder which comprises a grinder body, a pneumatic motor is fixedly installed in the right end of the grinder body, a rotating shaft is fixedly installed at the output end of the pneumatic motor, a bearing is fixedly installed in the right end of the grinder body, and the outer wall of the rotating shaft is rotationally connected into the bearing in a sleeved mode. And a dismounting mechanism is arranged at the right end of the machine body and comprises a mounting base, and the middle of the left side of the mounting base is fixedly mounted at the right end of the rotating shaft. Through the arrangement of the grip and the anti-slip leather sheath, the grinder is convenient to manually control, is small in size, low in cost, simple and convenient to operate, high in portability and suitable for small working environments, can grind the surface of an electrode under the condition that large or expensive equipment is not needed, and is convenient to meet some specific process requirements; and in addition, the grinding head is convenient to disassemble and assemble, and the convenience of replacing the grinding head is improved.

The invention solves the problems in the prior art, and provides a gas chromatography detection method for related substances of 2, 5-dimethoxytetrahydrofuran, which is simple and convenient to operate, good in specificity, linearity and precision, high in sensitivity and good in durability, can be used for quality control of a compound (Va), namely 2, 5-dimethoxytetrahydrofuran, and meets process requirements.

A forming method of a semiconductor structure comprises the steps that a substrate comprises a first region and a second region; modifying the second core material layer in the second region to form a third core material layer having an etching selection ratio with the second core material layer; forming a first core material layer; patterning the first core material layer to form a first core layer; forming a first side wall; patterning the second core material layer and the third core material layer in the second region to form a second core layer and a third core layer; forming a second side wall; forming a third protection layer; patterning the third core layer by taking the third protective layer as a mask; the second side walls and the third core layer are used as masks to pattern the target material layer, first target structures and second target structures are formed, and the pitch of the adjacent first target structures is smaller than or equal to the pitch of the adjacent second target structures. The SAQP process and the SALELE process are formed at the same time, and the design freedom degree in the patterning process is improved.

The invention relates to the technical field of machining, and provides a flexible machining system and a shell machining method.The flexible machining system comprises a first numerical control vertical lathe, a second numerical control vertical lathe, a first horizontal machining center, a first pound press and a first laser marking machine; the first horizontal machining center is provided with a face milling cutter, an inner hole milling cutter, a side face groove milling cutter and a facing head. A horizontal machining center clamp is arranged on the first horizontal machining center. The device is complete in type so as to meet various process requirements, the machining efficiency and the product precision are improved, and the machining difficulty of the inner cavity inclined hole is reduced.

The invention relates to a method for continuously preparing 1, 2-propylene glycol and 1, 3-propylene glycol and application of the method, and belongs to the field of preparation of propylene glycol. In a hydroformylation reaction unit, vinyl acetate, synthesis gas and a first catalyst are subjected to a contact reaction; cooling a part of the hydroformylation reaction product, returning to the hydroformylation reaction to control the reaction temperature, and carrying out pressure reduction on the other part of the reaction product to separate out crude acetoxypropionaldehyde; the crude acetoxypropionaldehyde and hydrogen are subjected to a contact reaction on a second catalyst, water is used as a solvent, the reaction product continues to be subjected to a contact reaction with a third catalyst solution, and 1, 2-propylene glycol, 1, 3-propylene glycol and acetic acid are obtained after separation treatment. The method is safer in raw materials, simple in process, easy to operate, diversified in product composition and high in market adaptability.

The utility model provides an extension device which comprises a reflecting plate and a plug, the reflecting plate is provided with a first surface facing a bell jar, the first surface of the reflecting plate is provided with a plurality of lamp tubes, the reflecting plate is provided with heat dissipation through holes, and the plug is inserted into the heat dissipation through holes. The heat dissipation through holes are formed in the two sides of the vertical projection of at least one lamp tube on the reflecting plate, and plugs can be inserted into the heat dissipation through holes to block the heat dissipation through holes so as to adjust the heat dissipation capacity of the reflecting plate. By adjusting the distribution of the plugs in the heat dissipation through holes, the reflecting plate can ensure that the temperature of the graphite base and the wafer below the bell jar meets the process requirement, and meanwhile, the temperature of the surface of the bell jar is effectively reduced, so that a coating on the inner wall of the bell jar is reduced, and the product quality is further improved.

The invention discloses a patterning method, a semiconductor structure and a memory. The patterning scheme comprises the following steps: after a mandrel structure is formed in a mask layer on one side of a layer to be etched, a part of the mandrel structure is removed to form a first trench with a smaller length and a second trench with a larger length, and a first mask pattern and a second mask pattern are formed by the first trench and the second trench, therefore, the first patterned structure and the second patterned structure which are different in length are formed. According to the patterning method, the applicability of the patterning method can be improved, and the process difficulty and cost of a fine composition process for forming patterns of different sizes are reduced, so that the patterning method provided by the invention can meet more process requirements.

The pouring system for continuous rheological extrusion of liquid nonferrous metals includes a melting furnace, a holding furnace, a flow channel docking device, a flow channel device, a continuous rheological extruder, a cooling device, a guide frame and a storage device. The melting furnace and the holding furnace are electromagnetic induction furnaces. The bottom of the crucible is provided with a bottom channel, and the bottom channel is opened and closed by a plunger valve. The bottom channel of the crucible is connected to the flow channel device with a heat preservation function through a flow channel docking device. The melting furnace and the holding furnace, as well as the holding furnace and the continuous rheological extruder, are connected through the flow channel device. The cooling device, the guide frame and the storage device are sequentially arranged after the continuous rheological extruder. The beneficial effect is that the problems of unstable pouring temperature and pouring speed in the continuous rheological extrusion production process are solved, and it has the advantages of being able to refine grains, reduce casting defects, shorten the process, and be energy-efficient; strong adaptability, unlimited product length, good quality; small investment, and low production cost.

The utility model discloses a bolt type fixing support, which relates to the technical field of building construction, and comprises a connecting main body, a fixing main body and a bolt, the connecting main body is fixed with the fixing main body, the fixing main body is provided with a first socket, a second socket and a bayonet, the bayonet is arranged between the first socket and the second socket, and the bolt is fixed on the connecting main body. The bolt is sequentially inserted into the first socket and the second socket, and a fixed area is formed between the bolt and the bayonet. The bolt type fixing support is convenient, fast and reliable in fixing mode, simple in structure, easy to disassemble and assemble and capable of meeting process requirements.

The utility model relates to the technical field of die bonders, in particular to a die bonding mechanism, which comprises an adjusting assembly, a ZR motor fixed on the adjusting assembly, a die bonding arm fixed at the position of the output end of the ZR motor, an adsorption assembly rotatably mounted on the die bonding arm, and a fixing assembly fixed at the position of the output end of the ZR motor, the output end of the ZR motor drives the adsorption assembly to rotate on the die bonding arm, and the ZR motor can drive the vertical movement of the die bonding arm and the rotation of the adsorption assembly at the same time, thereby simplifying the overall structure of the die bonding mechanism, reducing the mechanical inertia, and more accurately controlling the vertical position of the die bonding arm and the rotation angle of the adsorption assembly. Therefore, the positioning of the wafer in the adsorption, transfer and placement process is more accurate, the die bonding quality and the product yield are improved, the position of the adsorption assembly connected with the adjusting assembly can be finely adjusted by the adjusting assembly, different die bonding process requirements and working scenes are adapted, and the die bonding mechanism has higher universality and flexibility.

This invention belongs to the technical field of thin film drying equipment, and relates to a thin film drying device and method. The thin film drying device includes a substrate conveying assembly and an air-knife film drying assembly. The substrate conveying assembly conveys the substrate, and the air-knife film drying assembly dries the wet film on the substrate surface. The air-knife film drying assembly includes an inlet / outlet section, a control section, an air outlet section, an air velocity sensing system, and an air velocity control system. The control section has a control duct and multiple control components. Each control component includes an air valve and a drive component. The air valve is disposed within the control duct, and the drive component controls the rotation of the air valve to adjust the airflow angle and air velocity at the inlet / outlet. The air velocity sensing system and the air velocity control system are interconnected to monitor the air velocity at the air outlet. The air velocity control system controls the control components based on the monitoring signal from the air velocity sensing system to adjust the rotation angle of the air valve within the control duct. This invention reduces the impact of airflow on wet film formation, reduces film formation defects, and improves film quality.

A forming method of a semiconductor structure comprises the steps that a substrate comprises a first region and a second region; patterning the first core material layer to form a first core layer; forming a first side wall; patterning the second core material layer to form a second core layer; performing modification treatment on the second core layer exposed in the second region to form a third core layer having an etching selection ratio with the remaining second core layer; forming a second side wall covering the side walls of the second core layer and the third core layer; the second side walls and the third core layer are used as masks to pattern the target material layer, first target structures and second target structures are formed, and the pitch of the adjacent first target structures is smaller than or equal to the pitch of the adjacent second target structures. According to the invention, the SAQP process and the SALELE process are formed at the same time, the degree of freedom of design in the patterning process is improved, and a part of redundant first target structures in the first region adopting the SAQP process can be removed under the condition that a photomask and process steps are not increased.

The invention relates to the technical field of ferrous metallurgy, in particular to a low-carbon zero-carbon ironmaking device and method.The low-carbon zero-carbon ironmaking device comprises a fluidized bed system and a smelting reduction furnace system, and the fluidized bed system comprises a fluidized bed feeding pipe, a fluidized bed discharging pipe, a fluidized bed air inlet and a fluidized bed air outlet; the fluidized bed system is a multi-stage fluidized bed or a multi-layer fluidized bed, when the fluidized bed system is the multi-stage fluidized bed, at least one stage of fluidized bed is a bubbling fluidized bed, and when the fluidized bed system is the multi-layer fluidized bed, at least one fluidized bed layer is a bubbling bed layer; the smelting reduction furnace system comprises at least one smelting reduction furnace; and the fluidized bed discharge pipe is connected with a solid material spray gun of the smelting reduction furnace. According to the device and the method, the carbon reducing agent and the hydrogen reducing agent can be simultaneously applied in any proportion, and the process requirements of the transition stage of carbon smelting and hydrogen smelting are met.

The utility model relates to the technical field of semiconductor processing equipment, concretely relates to a grid device and ion source equipment. The grid device includes conducting assembly, screen grid, acceleration grid, deceleration grid and grid mounting plate, screen grid, acceleration grid and deceleration grid are sequentially laminated and mutually spaced insulation settings, and all are installed in the open end of external ion source shell through grid mounting plate, screen grid, acceleration grid and deceleration grid all are insulated with grid mounting plate setting, and deceleration grid is close to grid mounting plate setting and is electrically connected with external current detection module through conducting assembly to output the current for detecting. The application is through the insulation setting of screen grid, acceleration grid, deceleration grid with grid mounting plate, and adds conducting assembly, and deceleration grid can be electrically connected with external current detection module through conducting assembly, and the current of deceleration grid is detected, so that the performance of ion source is more accurately evaluated, and the increasingly higher process requirement and stability requirement are satisfied.

The invention discloses a method for smelting low-carbon, low-silicon and high-sulfur molten iron in a converter at low cost. According to the method, 109-111t of low-carbon, low-silicon and high-sulfur molten iron is added into a 120t converter, 14-16t of dry high-carbon, high-silicon and low-sulfur pig iron is added, after smelting ignition is normal, the lance position is lowered to 1100-1300mm, the oxygen supply flow is controlled to be 400-450Nm < 3 > / min, after smelting is carried out for 240S, the lance position is raised to 1300-1500mm, the oxygen supply flow is controlled to be 400-410Nm < 3 > / min, and the lance position and the flow can be finely adjusted according to the slagging condition; the lance position is gradually reduced to 800-900 mm when the smelting is close to the end point, the oxygen supply flow is controlled according to 430-450 Nm < 3 > / min, and the end point pressure time is gt; 30S, 30S; the final temperature is controlled to be 1630-1650 DEG C, the final C content is controlled to be 0.03-0.07%, the final P content is less than or equal to 0.025%, and the final S content is less than or equal to 0.030%; by the adoption of the method, the process requirement for smelting the steel grade with S smaller than or equal to 0.035% through the low-carbon low-silicon high-sulfur molten iron can be met, cost is reduced, energy consumption is reduced, stable production is facilitated, safety risks are eliminated, and good application and popularization value is achieved.