60 results about "Pyrometallurgy" patented technology

The invention relates to the technical field of heavy non-ferrous metal pyrometallurgy and process equipment, and discloses a large heavy non-ferrous metal bath smelting furnace heat flow accurate matching method and system, and the method comprises the steps: generating key state parameters, and completing the evaluation of the real-time heat state in the furnace; cooling water flow, heat source distribution and the like are used as control variables, comprehensive optimization of heat flow uniformity, structural safety and operation energy efficiency is used as a target for solving, and an optimal control instruction set is output; the optimal control instruction set is decomposed and issued to different execution layers, so that the heat dissipation intensity of each partition is adjusted; heat production-heat dissipation balance in the furnace is reconstructed, and matching of peak clipping and valley filling of heat flow distribution is achieved; after the new control action is executed, sensor data are collected. The system comprises a pump station, a variable frequency pump, a heat exchanger, a smelting furnace, a heat flow control unit, a temperature sensor, a flowmeter, a regulating valve and a control center. The smelting strength and the heat efficiency are improved on the premise of guaranteeing the service life of the furnace lining and the structural safety.

The invention relates to a device and method for detecting the liquid level height of melt in a copper pyrometallurgy slag ladle, and belongs to the technical field of metallurgy, the device comprises a plurality of infrared cameras in one-to-one correspondence with tank bodies, and further comprises an infrared control box and an upper computer, and the upper computer is externally connected with a dust removal system; the infrared cameras are arranged above the tank bodies and used for collecting infrared images of the tank bodies, all the infrared cameras are electrically connected with the infrared control box, the infrared control box is electrically connected with the upper computer, and the upper computer is electrically connected with a plurality of sound-light alarm devices which are in one-to-one correspondence with the tank bodies and used for alarming the liquid level heights in the tank bodies. The front end of the tank body is provided with an anti-shielding detection device used for detecting whether a transport vehicle passes by or not, and when the anti-shielding detection device detects that the transport vehicle passes by, the upper computer controls the dust removal system to be started. According to the invention, cinder ladle discharge monitoring can be realized, the safety risk of equipment and personnel is reduced, and the cinder ladle alternation efficiency is improved.

The invention is in the field of pyrometallurgy and describes a process for the recovery of lithium by fuming. The process comprises smelting Li-ion batteries or their waste in a furnace with slag formers, resulting in a molten bath with distinct alloy and slag phases, and flue dust. Notably, at least 30% of the lithium is transferred to the flue dust under the chosen conditions without adding alkali or earth alkali halides. Li can then be recovered from the flue dust, valuable metals, such as Co and / or Ni, can be recovered from the alloy, and the remaining slag can be used in new smelting or Li- fuming operations.

The utility model discloses a discharging device for molten slag of a nickel pyrometallurgy furnace, belongs to the field of pyrometallurgy furnace equipment, and solves the problems that a discharging chute of an existing nickel pyrometallurgy furnace occupies a large position, and different discharging chutes need to be arranged on different molten slag layers. The device comprises a discharge shell, two discharge channels are arranged in the discharge shell and penetrate through the two ends of the discharge shell, a surrounding cooling tank is further arranged in the discharge shell, and the water inlet end and the water outlet end of the cooling tank are connected with cooling pipes. The molten slag discharging device is simple in structure and stable in installation, discharging of the molten slag of different molten slag layers is achieved on the same device, water can be introduced for continuous cooling in the discharging process, the device can be continuously used, the molten slag can be cooled, workers are prevented from being scalded, and operability of discharging of the molten slag of the nickel pyrometallurgy furnace is improved.

The invention provides a metallurgical furnace for multi-stage smelting and dilution of copper-nickel sulfide ore, and belongs to the technical field of non-ferrous metal pyrometallurgy equipment. The device is provided with a first-stage space smelting area, a second-stage molten pool smelting area, a third-stage molten pool reduction smelting area and a fourth-stage depletion smelting area which are communicated in sequence; a feeding nozzle and a spray gun are arranged at the top of the first-stage space smelting area to realize material pre-oxidation and impurity volatilization, and a side-blowing spray gun is arranged in the second-stage molten pool smelting area to finish deep smelting and slag-matte separation; a third-stage molten pool reduction smelting area is provided with a spray gun to create a reducing atmosphere, and impurities such as lead and zinc are selectively reduced and volatilized to be removed; a controllable polarity electrode and a sulfuration reducing agent feeding hole are arranged at the top of the fourth-stage depletion smelting area, so that electromagnetic stirring, chemical reduction sulfuration and the like are realized. Through multi-zone collaborative design and functional coupling, the problems that in the existing copper-nickel sulfide ore pyrogenic process, the smelting strength is improved, the adaptability to raw materials is poor, the slag dilution efficiency is low, and impurity valuable metal elements are difficult to enrich are solved.

The utility model relates to a sulfur dioxide flue gas acid liquor recovery device, which belongs to the technical field of non-ferrous metallurgy pyrometallurgy equipment, and comprises a flue gas pipeline, a half-month liquor collection box is fixedly arranged at the bottom of the flue gas pipeline, a liquor collection baffle is fixedly arranged on the inner bottom wall of the flue gas pipeline, a liquor discharge pipe is fixedly arranged at the bottom of the half-month liquor collection box, and the liquor discharge pipe is fixedly arranged on the bottom of the half-month liquor collection box. A wire mesh demister is fixedly installed on one side of the liquid collecting baffle, and a resistance reducing through hole is formed in one side of the wire mesh demister. According to the sulfur dioxide flue gas acid liquor recovery device, the liquid collection baffle is arranged in the flue gas pipeline, the half-month liquid collection box is arranged at the mounting opening in the bottom of the flue gas pipeline, the wire mesh demister is arranged on one side of the liquid collection baffle, flue gas is subjected to gas-liquid separation through the wire mesh demister, and after acid liquor in the flue gas is condensed on the liquid collection baffle, the acid liquor in the flue gas is recycled. And the flue gas freely falls into the half-month liquid collecting box and is discharged through the liquid discharging pipe, so that the acid liquid content in the flue gas is reduced.

The invention belongs to the technical field of batteries, and discloses a recovery method and application of a positive electrode material. The recycling method of the positive electrode material comprises the following steps that a waste lithium battery positive plate is pretreated, the positive electrode material is obtained, the positive electrode material comprises a positive electrode active material, conductive carbon and a binding agent, and the binding agent is an organic carbon material; and mixing the positive electrode material with a lithium salt, and calcining in a carbon dioxide atmosphere to remove the conductive carbon and the organic carbon material and supplement lithium to the positive electrode active material to obtain the positive electrode material. The method provided by the invention can effectively remove the binder and the conductive carbon, and retains good electrochemical performance of the positive electrode active material. Meanwhile, in the calcining process of the lithium salt, in-situ lithium supplementation can be carried out on the positive electrode active material, so that the electrochemical performance of the recycled positive electrode material is improved. Compared with hydrometallurgy, pyrometallurgy and other methods, the method has the advantages of being good in economical efficiency, low in energy consumption and environmentally friendly.

The invention discloses a dressing and smelting combined method for efficiently recovering tungsten and molybdenum elements from alkaline leaching and autoclaving tungsten slag. The method comprises the following steps: carrying out centrifugal reselection pretreatment on the alkaline leaching and autoclaving tungsten slag; centrifugal gravity concentration concentrate is low-grade tungsten concentrate and can be used as a raw material to be returned to an alkaline leaching and autoclaving process, and gravity concentration tailings and an additive are sufficiently mixed and then roasted; and after the roasted product is ground and screened, water leaching treatment is adopted, and a solution containing tungsten and molybdenum and leaching residues capable of being subjected to building material treatment are obtained. According to the method, the problems that when the tungsten slag is treated through a single wet process, the concentration of acid and alkali liquid is high, waste water treatment and recovery are difficult, and the process is tedious are solved, the low-grade tungsten concentrate is obtained through centrifugal separation by adopting the method of combining gravity separation and pyrometallurgy, and efficient enrichment and separation of tungsten and molybdenum can be achieved by adding a proper additive into gravity separation tailings to conduct roasting and water leaching. The method is low in comprehensive cost and high in extraction efficiency, and has a good industrial application prospect.

The application discloses a kind of carbon thermal method high-efficiency clean production rare earth ferrosilicon alloy processes for direct current electric arc furnace, belong to rare earth pyrometallurgy field.For the problem that existing carbon thermal method process is not enough for the characteristics of direct current electric arc furnace equipment adaptation, the application proposes some systematic innovations as follows: first, rare earth concentrate physical beneficiation pre-enrichment combined with three-stage temperature control roasting;Second, "coke+charcoal+lanthanum carbon" ternary compound carbon and intelligent carbon balance control;Third, iron additive collaborative reduction to improve the conductivity of molten pool and alloy fluidity;Fourth, "coarse-medium-fine" grading and layered distribution to match the direction of direct current electric field;Five, slag and dust ash full-component resource recovery.The process of the application can reduce the comprehensive power consumption to 7500-8000 kWh / t, the rare earth yield is more than 96%, the single furnace daily output is increased by 12-18%, the dust emission concentration is less than or equal to 10 mg / m3, the solid waste comprehensive utilization rate is greater than or equal to 90%, and the high efficiency and cleanness of carbon thermal method production of rare earth ferrosilicon alloy for direct current electric arc furnace are realized.

The invention discloses a method for accurately regulating and controlling oxygen vacancy concentration in a lithium-rich layered oxide positive electrode material and application of the method. According to the method, a controllable oxygen partial pressure environment is established by utilizing a CO / CO2 mixed gas pair on the basis of a pyrometallurgy principle, and the proportion of Mn < 4 + > / Mn < 3 + > in the material and the corresponding oxygen vacancy concentration are accurately regulated and controlled through a thermodynamic equilibrium process. According to the method, the oxygen vacancy concentration can be continuously and accurately controlled in an extremely wide oxygen partial pressure range (10 <-0.7 > to 10 <-10 > atm), and foreign impurities are not introduced. Along with the increase of oxygen vacancy concentration, lattice expansion and superstructure enhancement of the material occur, so that the activity and reversibility of the anion oxidation-reduction reaction are remarkably optimized. Experiments show that the lithium-rich positive electrode material treated by the method under the optimized condition shows higher specific capacity and improved cycle stability.

The invention discloses a metal collaborative recovery and cascade purification method, which comprises the following steps: classifying and pretreating metals, collecting metal-containing materials from wastes, carrying out preliminary classification according to metal types, treating bulk materials into proper particle sizes through physical methods of crushing, screening and grinding, and carrying out chemical leaching and dissolving. The method comprises the following steps: carrying out chemical leaching on metal by using an acid, alkali and saline solution, dissolving target metal and forming a metal ion solution, adding a precipitator into the metal ion solution to separate out the target metal in the form of precipitate, separating the precipitate from clear liquid by virtue of a filtering and centrifuging method, and collecting metal precipitate; according to the method, the whole-process recovery and purification of the metal from waste to a high-purity product are realized through a cascade process of classification pretreatment, chemical leaching, precipitation separation, washing and drying and extraction refining, and compared with traditional pyrogenic process smelting, a high-temperature environment is not needed, and the energy consumption and the treatment cost are remarkably reduced.

The utility model discloses a kind of ore group preheating equipment for pyrometallurgy zinc, including drying device, preheating device, drying device is set in the left side of preheating device, drying device, preheating device is respectively connected with production workshop control cabinet electric telecommunication.The function of the utility model is to shovel after the dry ore group from conveyor belt device, ensure the normal operation of device;It can make ore group rotate constantly while being preheated gas purging, make ore group heat evenly, prevent ore group cracking, ensure the preheating effect of ore group heat;Prevent condensation water accumulation, fall back on ore group and lead to return moisture, simultaneously, condensation water is quickly discharged, which can also prevent condensation water vaporization absorb heat in preheated gas, so as to ensure preheating effect.

The invention relates to the technical field of heavy nonferrous metal pyrometallurgy and process equipment, and discloses a method and device for regulating and controlling thermal stress of a furnace body of a nonferrous metal bath smelting furnace, and the method comprises the steps that a furnace shell is divided into a feeding end area, a middle high heat load area, a copper or lead discharging end area, a nickel discharging end area and other areas in the furnace length direction; dividing areas along the furnace width direction according to the axis of the top-blowing spray gun or the position of the side-blowing tuyere; establishing a radial one-dimensional or two-dimensional heat conduction equivalent model of the furnace lining, the buffer layer, the cooling wall and the furnace shell, and calculating temperature distribution at a key interface between the furnace shell and the furnace lining; establishing a calculation model of the equivalent thermal stress of each area of the furnace shell, and evaluating the equivalent thermal stress value and the safety margin of each control area; and establishing a multivariable feedback-feedforward control or model prediction control strategy, and dynamically matching the thermal load and the cooling capacity of each sub-region. According to the invention, real-time calculation and monitoring of equivalent thermal stress of key parts of the furnace shell and the furnace lining and dynamic reduction and preventive control of thermal stress of the furnace body are realized.

For treating petrochemical catalysts for the selective extraction of molybdenum therefrom, a plant and a process are proposed for extracting the molybdenum by charging a batch of catalysts to a rotary kiln of which the refractory is heated or preheated to a high temperature, and setting the kiln in rotation so that the catalyst charge undergoes constant renewal of the surface in contact with the superheated refractory. The catalyst charge is brought to temperatures of the order of 1300° C. (1250 to 1350° C.), which allow around 95% of the molybdenum present to sublime.

The invention relates to a method for full utilization of steel slag, in particular to a method for resource recycling of steel slag through acid leaching pyrogenic pretreatment of a wet grinding device. The technological process comprises the following steps that firstly, converter steelmaking final slag is subjected to molten-state oxidation slow cooling treatment, so that mineral phase composition is improved, and a loose and porous steel slag structure is obtained; then, the pretreated steel slag is crushed through a jaw crusher until the particle size ranges from 0.5 mm to 2 mm, the crushed steel slag is conveyed to a special leaching device, and a stirring-ball milling system is started to strengthen the mass transfer process; under the cooperation of mechanical grinding and acid leaching chemical effects, elements such as calcium, phosphorus, silicon and magnesium are selectively dissolved out and enter a leaching solution, and iron and manganese elements are enriched in residues as much as possible. Through process integration and device innovation, efficient recovery of phosphorus and effective retention of iron (the iron retention rate gt; 99%) are realized. The efficient separation of phosphorus and iron is realized under the condition of room temperature, and a reliable way is provided for large-scale resource absorption and full-quantization high-value utilization of the steel slag.

The invention relates to a method of pyrometallurgical smelting of BOF or EAF steelmaking slag according to claim 1. The invention also relates to a granulated slag thus obtained and the use thereof in the production of cement.

The utility model relates to the technical field of metallurgical furnace equipment, in particular to a discharge port device for a pyrometallurgical furnace, which is characterized in that a water jacket is embedded in a blast furnace body, the water jacket is tightly fixed by a wedge block and a limiting ring cushion block, a discharge port is filled with a graphite hole brick and a graphite bushing, the discharge port is reduced, and the discharge port is sealed by injecting water into the water jacket. The temperature of the blast furnace solution discharged from the blast furnace can be reduced, potential safety hazards are reduced, and stable operation of the whole equipment is guaranteed.

The present application belongs to copper pyrometallurgy technical field, specifically discloses a kind of dynamic optimization method of double-side blowing copper smelting slag type based on molten pool working condition real-time monitoring and model driving.The method includes: real-time acquisition molten pool temperature, flue gas oxygen content, slag Fe3O4 Content and viscosity and other multiple key working condition parameters;Parameter is input into the preset control model, the expert rule based on metallurgical thermodynamics and production data is embedded in the model, and the dynamic adjustment amount of SiO2, CaO, MgO three kinds of slag forming agent is calculated accordingly;According to the adjustment amount, the proportion of slag forming agent is adjusted in real time;Periodic acquisition of slag sample analysis, compare measured value with model expected value, and feedback correction model parameters, realize closed-loop optimization.The present application can dynamically adjust slag type according to molten pool real-time working condition, reduce the fluctuation of slag fluidity by more than 40%, stabilize the copper content of slag below 1.5%, and improve the direct recovery rate of copper to more than 97.5%, significantly improve the process stability and metal recovery rate.

The invention discloses a furnace top water jacket of a side-blown furnace and a using method of the furnace top water jacket, belongs to the field of thermometallurgy equipment, and solves the problem that an existing molten steel jacket is prone to local water leakage under flue gas corrosion. The device comprises a first water jacket and an arch-shaped connecting plate which are matched with an arch-shaped covering area of the side-blown furnace, second water jackets which are in arch-shaped symmetry are detachably connected to the two sides of the first water jacket, third water jackets are detachably connected to the second water jackets on the two sides, and the arch-shaped connecting plate is connected with the side portions of the first water jacket, the second water jackets and the third water jackets. And a plurality of snake-shaped water tanks are arranged in the first water jacket, the second water jacket and the third water jacket. The using method comprises the steps that the first water jacket, the second water jacket and the third water jacket are sequentially connected, installed on the furnace top of the side-blown furnace and installed through the hanging chain, and finally water is fed into the S-shaped water tank for use. The water jacket is simple in structure and high in practicability, the whole water jacket covers the side-blown converter through the arch structure, low corrosion of the water jacket is achieved, the whole water jacket has high practicability, and the popularization and application prospects are wide.

The utility model discloses a zinc pyrometallurgy smelting device. The pyrometallurgy zinc smelting device comprises a furnace body, the furnace body is provided with an oxidation smelting cavity and a reduction smelting cavity, and the bottoms of the oxidation smelting cavity and the reduction smelting cavity are communicated; the zinc pyrometallurgy smelting device further comprises a first smoke outlet, a first metal discharging opening, a first nozzle, a second smoke outlet, a second metal discharging opening and a slag discharging opening which are formed in the furnace body. The first smoke outlet, the first metal discharging opening and the first nozzle all communicate with the oxidation smelting cavity. The first spray gun is connected with the first nozzle so as to spray oxygen into the oxidation smelting cavity; and the second smoke outlet, the second metal discharging opening and the slag discharging opening all communicate with the reduction smelting cavity, and after zinc concentrate is smelted in the oxidation smelting cavity and subjected to oxidation desulfurization treatment, slag generated by smelting in the oxidation smelting cavity flows into the reduction smelting cavity to be subjected to reduction treatment. According to the embodiment of the utility model, mineral aggregate can be directly fed into the furnace, the material preparation process is simplified, and the metal recovery rate is improved.

This invention discloses a method for producing rare earth ferrosilicon alloys using a DC submerged arc furnace carbothermal process, belonging to the field of rare earth pyrometallurgy. Addressing the problems of furnace bottom nodules and short smelting cycles in AC submerged arc furnaces, this invention utilizes the characteristics of a DC submerged arc furnace—current flowing through the molten pool without skin effect, possessing directional electromigration driving force, and stable arc—and proposes the following innovations: First, it utilizes the Joule heating effect of the DC electric field to maintain the furnace bottom temperature above the decomposition temperature of rare earth carbides; second, it utilizes RE... 3+ The invention reduces furnace bottom deposition through electromigration; and thirdly, it removes furnace nodules online through polarization reversal operation. The invention also establishes a synergistic regulation relationship between carbon deficit and silicon replenishment. This invention can extend the smelting cycle to over 1440 hours, achieve a rare earth yield of over 95%, and reduce overall power consumption to below 8000 kWh / t, realizing continuous and stable operation of rare earth ferrosilicon alloy production via the carbothermal method.

This invention relates to the field of non-ferrous metal pyrometallurgy technology, and discloses a copper smelting method with synergistic control of a high-oxygen-enriched multi-component slag. The aim is to solve the problems of poor slag fluidity, large copper loss, and severe furnace lining erosion caused by over-oxidation of the molten pool in high-oxygen-enriched smelting. This method constructs a five-component slag system of FeO–SiO2–CaO–MgO–Al2O3, controlling the slag composition within a specific range: iron-silicon ratio 1.8–2.2, CaO 2.5%–4%, MgO 1%–2%, Al2O3 3%–5%, and SiO2 20%–25%. Simultaneously, synergistically matched process parameters are employed: oxygen enrichment rate 70%–85%, smelting temperature 1340–1360℃, and air supply intensity per unit area not less than 2100 Nm. 3 / (m 2 (h). Through a dynamic control mechanism, the physicochemical properties of the molten slag are monitored online and process variables are adjusted accordingly to control the slag viscosity to less than 0.3 Pa·s, the Fe3O4 content to 3%–5%, and the copper content to less than 1.5%. This invention achieves the technical effects of high slag-gold separation efficiency, low copper loss, and extended furnace lining life.

The utility model discloses a multifunctional composite smelting furnace for pyrometallurgy, which integrates the functions of a traditional electric furnace and a side-blown furnace, can perform electric furnace smelting and side-blown furnace smelting in one furnace, and is characterized in that a conductive cross arm and a graphite electrode clamping device are arranged above the composite smelting furnace; a side blowing spray gun is arranged on the side portion of the furnace body, the furnace cover rotates through the rotary hydraulic cylinder and is rotated out of the furnace body, and the furnace body tilts through the tilting hydraulic oil cylinder to empty melt in the furnace. The composite smelting furnace is high in smelting efficiency, safe, reliable, easy to operate and suitable for smelting and enrichment of various raw materials containing nickel, copper, cobalt, rare and precious metals and the like.

The invention belongs to the technical field of thermometallurgy, and particularly relates to a process for preparing ferro-nickel alloy by smelting laterite-nickel ore through an RKEF process. The process comprises the following steps: (1) preparing laterite-nickel ore powder, semi-coke powder and quicklime powder; (2) uniformly mixing the laterite-nickel ore powder and the quicklime powder to obtain mixed powder A; (3) uniformly mixing the mixed powder A with the semi-coke powder obtained in the step (1) to obtain mixed powder B; (4) adding a compound additive into the mixed powder B to obtain mixed powder C; (5) roasting the mixed powder C obtained in the step (4); and (6) cooling the roasted product along with the furnace, crushing and magnetically separating to obtain a main product ferro-nickel alloy and a by-product slag. The smelting temperature of the electric furnace is reduced by reducing the viscosity and the melting temperature of the slag, so that the electric energy consumption is reduced, the energy consumption is reduced, the production cost is reduced, and the nickel reduction rate is increased.

The utility model discloses an automatic monitoring device for kiln body expansion of a metallurgical furnace, belongs to the field of pyrometallurgical furnace equipment, and solves the problems that manual measurement is needed in the production of the existing metallurgical furnace, furnace body expansion data cannot be captured in real time, and metallurgical production is influenced. The device comprises a slide rheostat, the slide rheostat is fixed in a shell and is provided with a slide plectrum, one side of the slide plectrum is provided with a connecting rod, the connecting rod abuts against a metallurgical furnace shell, the other side of the slide plectrum is provided with a reset rod, the reset rod is connected with a spring, and the other end of the spring is connected to the inner wall of the shell through a spring seat. And two wiring ports on the slide rheostat are respectively connected with positive and negative electrodes of a power supply. According to the utility model, the expansion displacement signal is effectively converted into the electric signal in direct proportion to the expansion displacement signal, so that the online monitoring of the expansion of the furnace body is realized, and the positive effect on the daily use and maintenance of the metallurgical furnace is achieved.

This invention relates to the field of pyrometallurgical technology, and in particular to a method for the resource-based treatment of iron and steel slag. The invention involves blowing oxygen-containing gas into molten iron and steel slag to oxidize free iron, obtaining oxidized molten iron and steel slag; mixing the oxidized molten iron and steel slag with silica-containing powder to undergo a silicification reaction, obtaining silicified molten iron and steel slag; and shaping the silicified molten iron and steel slag to obtain building materials. The method provided by this invention achieves complete resource utilization of iron and steel slag, eliminating the need for water quenching of the molten iron and steel slag, saving water resources, reducing liquid, gas, and solid pollution sources, and, more importantly, recovering and utilizing thermal energy, thus reducing carbon emissions and protecting the environment. Furthermore, the resulting product can be directly used as a building material, reducing the amount of natural stone and gravel required.

The present invention provides a method and apparatus for producing manganese from a manganese ore without using any carbon or a carbon-containing reductant. The manganese ore may be a primary ore comprising rhodochrosite and / or a secondary ore in which manganese is present as at least one of the mineral and mineraloid forms of manganese oxide and manganese oxyhydroxide, for example. The method (500a) comprises comminuting (501) the manganese ore into fines and converting a manganiferous mineral in the ore into a trivalent manganese oxide using at least one of a reductant-free pyrometallurgical technique (502) and an inorganic hydrometallurgical technique (503). The trivalent manganese oxide is then added (505) to an amount of liquid sodium in excess of the stoichiometric amount thereof required for a redox reaction between the liquid sodium and the trivalent manganese oxide, to produce a solid phase comprising both elemental manganese and other insoluble products at least comprising sodium oxide. This redox reaction is conducted in an inert atmosphere and its temperature is controlled to remain below about 600 °Celsius to inhibit the production of ternary oxides like α- NaMnO2. The method then comprises separating (506) at least some of the solid phase from the liquid sodium, and separating (507) the elemental manganese from the other insoluble products, which may be done, for example, based on their different densities. The phase separation (506) and the separation (507) of the elemental manganese from the other insoluble products may be carried out in any order. Thus manganese can be extracted from its ores without producing any greenhouse gases, and sodium oxide, or sodium hydroxide derived from hydrating this sodium oxide, can be produced as a co-product. If this sodium oxide and / or hydroxide, which has a high affinity for carbon dioxide, is then used to mineralize captured carbon dioxide, the invention can have a negative carbon footprint overall. The corresponding apparatus comprises a comminution device (such as a rock crusher or grinder), a subassembly for converting the manganiferous mineral in the ore into a trivalent manganese oxide, a gas-tight reaction vessel for reacting the trivalent manganese oxide with the liquid sodium, a solid-liquid sodium phase separator for removing excess liquid sodium, and a solid-species separator for separating the elemental manganese from the other insoluble products.

The invention provides a soil remediation method based on landfill of tailings from laterite nickel ore smelting, including first, carrying out reinforcement treatment in the area of soil to be landed, to lay a base layer at the bottom of the area of soil to be filled; Secondly, the landfill layer is set on the base layer, which includes hydrometallurgical nickel ore tailings, pyrometallurgical nickel ore tailings, and humus; Next, a drainage layer is set on the landfill layer, which is connected with the drainage ditch around the soil area to be buried; Then, a green soil layer is laid on the drainage layer, the green soil is conducive to vegetation growth; Finally, green plants are planted on the green soil layer to complete the soil remediation. The invention firstly improves the soil remediation efficiency by doping the humus and reduces the heavy metal activity in the hydrometallurgy and pyrometallurgy tailings, after that, green plants are planted on the green soil layer to reduce the harm of soil pollution caused by the direct landfill of laterite nickel ore smelting slag.

The present disclosure relates to a method and a smelting unit (1) for the pyrometallurgical smelting of metal-containing raw materials, waste materials and / or secondary waste materials (M) in the presence of an oxidizing, reducing and / or inert gas (G).

The invention relates to the technical field of pyrometallurgy, and provides a conveying system for a pyrometallurgy flue nodulation eliminating agent, the conveying system comprises a spiral conveyor, a gas conveying pipe, a spray gun and a mixing tank, the input end of the spiral conveyor is provided with a sealing tank for storing the eliminating agent, one end of the gas conveying pipe is communicated with a power gas source, the power gas source is oxygen, and the other end of the gas conveying pipe is communicated with the mixing tank; the output end of the spiral conveyor and the other end of the gas conveying pipe are respectively communicated with the input end of the mixing tank in a one-way manner; and the output end of the mixing tank is connected with a spray gun for extending into the furnace body to spray the elimination agent through a pipeline. Oxygen is used as a power source, a nodule conveying system and a secondary combustion air system are integrated, and a sealing tank, a spiral conveyor, a mixing tank and a spray gun are used for cooperatively conveying an eliminating agent, so that nitrogen introduction is avoided, the smoke amount is reduced, the secondary combustion oxygen concentration is increased, the impurity oxidation and nodule eliminating effect is enhanced, the equipment energy consumption cost is saved, the production continuity is guaranteed, and the working environment is improved.