67results about "Titanium tetrachloride" patented technology

The present invention relates to a porous composite feedstock for metal chloride preparation, comprising a metal oxide containing material,; and / or a first additive; and a binder; wherein the porous composite feedstock is in particulate form; wherein the water content of the porous composite feedstock is in the range of from 0.01 to 5 wt.% based on the weight of the porous composite feedstock; and wherein the porous composite feedstock has a poured bulk density in the range of from 0.2 g / cm3 and 2.0 g / cm3.

The invention discloses a method for preparing titanium tetrachloride through gas-based reduction carbonization and fused salt chlorination of melt separation titanium slag. The method comprises the steps that titanium slag obtained through hydrogen reduction and electric furnace melt separation of vanadium-titanium magnetite concentrate is ground to a certain particle size; the titanium slag obtained in the first step is placed in a tubular furnace, the temperature is increased to 1100-1300 DEG C, meanwhile, mixed gas of methane and hydrogen is introduced for a reaction, and a carbonized product is obtained; and mixing the carbonized product obtained in the second step with chlorine salt, and carrying out chlorination reaction at a certain temperature to produce crude titanium tetrachloride. According to the method, gas-based reduction and carbonization of the melt separation titanium slag are achieved, compared with a traditional high-temperature carbonization process, the reaction temperature is greatly reduced, the carbonization rate is remarkably increased, and a new thought is provided for comprehensive utilization of the melt separation titanium slag.

The invention belongs to the field of preparation of a titanium-based material titanium tetrachloride for an integrated circuit, and relates to a method for removing trace impurities of electronic-grade chemicals, in particular to a method for preparing ultrapure titanium tetrachloride through membrane filtration and adsorption, which comprises the following steps: S1, performing ultrasonic treatment on a microfiltration membrane in ultrapure water to obtain an ultrapure microfiltration membrane; s2, flatly placing the ultra-pure micro-filtration membrane in a drying oven for drying, and removing internal moisture; and S3, enabling the titanium tetrachloride stock solution to penetrate through the dried ultra-pure micro-filtration membrane under pressure driving, so as to prepare the ultra-pure titanium tetrachloride. The method can efficiently adsorb trace metal impurities in titanium tetrachloride, and the whole filtration and adsorption process has the advantages of being simple and convenient to operate, mild in condition, high in removal efficiency, environmentally friendly and the like.

The invention belongs to the field of separation, and particularly relates to a method for extracting and separating niobium and titanium from niobium concentrate. The method comprises the following steps: (1) crushing a niobium concentrate raw material, and then adding a carbonaceous reducing agent and a binder to prepare a spherical material; (2) heating the spherical material in an inert atmosphere for carbonization treatment to obtain pretreated powder; (3) heating and roasting the pretreated powder, and then continuously introducing chlorine until the reaction is finished; and (4) performing fractional condensation on a volatile gas-phase product in the roasting process to obtain NbCl5 and TiCl4, thereby completing the separation. The method is efficient in reaction, short in process, low in cost and free of secondary pollution, product purity exceeds 99%, traditional technical problems are solved, and industrialization is easy.

The present invention discloses a method and device for separating vanadium-containing mud, the method comprising: sending air heated to a predetermined temperature and mist-like vanadium-containing mud into a combustion device, wherein a combustion reaction and evaporation of liquid in the vanadium-containing mud occur in the combustion device to obtain a gas-solid mixture; and separating the gas-solid mixture to obtain separated gas and separated solid; wherein the combustion reaction comprises the reaction of carbon elements and vanadium elements in the vanadium-containing mud with oxygen in the air, respectively. The present invention can separate and recover titanium tetrachloride and vanadium-containing substances in the vanadium-containing mud, and can shorten the processing time of the separation operation to achieve rapid separation.

The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.

A long-term operation method that effectively increases the amount of material fed into a molten salt chlorination furnace in the later stage of operation. With the operation of the molten salt chlorination system, the inner wall of the chlorine gas pipeline in front of the furnace of the chlorine gas system in front of the molten salt chlorination furnace is scarred, and the pressure in the buffer tank gradually increases. When the pressure in the buffer tank affects the stable operation of the molten salt chlorination system, the molten salt chlorination furnace performs a salt return operation; ensure that the molten salt in the molten salt chlorination furnace is completely solidified after returning to the chlorine pipe outside the molten salt chlorination furnace, clean or replace the chlorine gas pipeline in front of the furnace, and after completion, remove the blind plate and reinstall the chlorine gas pipeline in front of the furnace, and restart the furnace production. The advantages are: the process is simple, the chlorine gas pipeline in front of the furnace that is blocked in the later stage of the chlorination furnace operation can be cleared online, and the docking pressure between the chlorination furnace and the oxidation can be reduced, thereby achieving the purpose of increasing the amount of material fed into the chlorination furnace, effectively avoiding the situation where the amount of material fed is reduced due to the increase in docking pressure, greatly increasing the output of crude titanium tetrachloride and titanium dioxide in the chlorination furnace, and ensuring the long-term operation of the molten salt chlorination.

The invention provides a device and a method for continuously adding an organic vanadium removal agent. The adding device comprises a vanadium removal agent heating device, a vanadium removal agent conveying device and a metering device, the vanadium removal agent heating device comprises a vanadium removal agent heating tank, a funnel and a heating rod; the vanadium removal agent conveying device comprises a circulating pump, a plunger metering pump and a nitrogen pipe; the circulating pump is used for internally circulating the heated vanadium removal agent in the vanadium removal agent heating tank; the plunger metering pump is used for conveying the heated vanadium removal agent in the vanadium removal agent heating tank to the vanadium removal feeding tank; a pipeline between an outlet of the plunger metering pump and the vanadium removal feeding tank is connected to the nitrogen pipe through a three-way pipe, and three outlets of the three-way pipe are each provided with a ball valve used for controlling connection and disconnection; the metering device comprises a liquid level meter, a weighing sensor and a mass flow meter. The problem that in the organic matter vanadium removal process, accurate and stable control is difficult in the process that a high-viscosity vanadium removal agent is added into a distillation system is solved.

The invention provides a process for purifying and refining industrial grade titanium tetrachloride, which comprises the following steps of: removing main impurities such as silicon tetrachloride, vanadium oxychloride, aluminum chloride, ferric chloride and titanium oxychloride in a titanium tetrachloride crude product by adopting a rectification method and a chemical method, and condensing into a titanium tetrachloride liquid; carrying out degassing treatment on the titanium tetrachloride liquid; filtering the titanium tetrachloride liquid by using an ultrafiltration membrane; filtering the titanium tetrachloride liquid by using a nanofiltration membrane; and crystallizing the titanium tetrachloride liquid to obtain a finished product of which the purity reaches 99.99% and the total content of metal impurities is less than 5ppb. Main impurities in a titanium tetrachloride crude product are removed through a rectification method and a chemical method, then titanium tetrachloride liquid is filtered through an ultrafiltration membrane and a nanofiltration membrane, and metal impurities are efficiently removed through surface negative charges of the nanofiltration membrane, so that a titanium tetrachloride finished product with the purity reaching 99.99% and the total content of the metal impurities being smaller than 5 ppb is obtained. The process steps are simplified, and the titanium tetrachloride purification efficiency is improved.

A novel circulating fluidized bed chlorination furnace system is disclosed. The outlet of the petroleum coke feed tank is connected in parallel to the lower inlet of the chlorination furnace via a discharge pipe. The bottom of the chlorination furnace also has multiple chlorine inlets and slag discharge ports. The chlorine inlets are connected to chlorine pipes, and the slag discharge ports are connected to slag discharge pipes. The top of the chlorination furnace has an outlet, which is connected to the side inlet of a high-temperature cyclone separator via a feed pipe. The top of the high-temperature cyclone separator also has a liquid discharge port, which is connected to the top of a low-temperature cyclone separator via a liquid discharge pipe. The top of the low-temperature cyclone separator also has a liquid outlet. This invention features a compact structure, convenient installation, stable operation, and is safe and environmentally friendly. The entire reaction system is fluidized, preventing slag discharge pipe blockage. The combined use of the high-temperature and low-temperature cyclone separators ensures multiple cycles, repeated combustion, and reaction of the titanium tetrachloride mixture.

The invention belongs to the technical field of titanium tetrachloride production, and relates to a feeding device for improving the titanium yield of a titanium tetrachloride molten salt furnace and a use method of the feeding device. According to the feeding device and the feeding mode, the loss of materials in the fused salt chlorination process can be remarkably reduced, the materials can be uniformly distributed in fused salt by directly adding the materials below the liquid level of the fused salt, the chlorination reaction is more sufficient, fine particles taken away by titanium tetrachloride gas are reduced by 80%, the loss of the materials is greatly reduced, and the service life of the materials is prolonged. Leakage of titanium tetrachloride caused by abrasion of a pump outlet pipeline in a subsequent process is avoided; according to the feeding device, gas conveying is adopted, the chlorination reaction is an exothermic reaction, and normal-temperature nitrogen is adopted for conveying materials, so that the temperature of titanium tetrachloride escaping outwards from the high-temperature molten salt tank can be reduced; by accurately controlling the pressure and flow of material conveying, the yield of titanium products is further improved, the production cost is reduced, and the economical efficiency and safety of titanium tetrachloride production are enhanced.

The invention relates to the technical field of titanium chemical industry, and discloses a method for producing TiCl4 by low-temperature chlorination of low-valence titanium, which comprises the following steps: S1, adding a low-grade titanium-containing material and a carbonaceous reducing agent into a reduction furnace, and heating and smelting in the reduction furnace to obtain a low-valence titanium-containing material; s2, crushing the low-valence titanium-containing material; s3, adding the crushed low-valence titanium material into a low-temperature chlorination furnace for low-temperature preheating; and S4, heating to a reaction temperature, continuously introducing chlorination gas into the low-temperature chlorination furnace, and carrying out a low-temperature chlorination reaction to obtain TiCl4. According to the method, the low-grade titanium-containing material is reduced into the low-valence titanium-containing material, then the low-valence titanium-containing material is crushed, and finally the low-temperature chlorination reaction is performed to prepare TiCl4, so that the smelting power consumption of the reduction reaction is reduced, the problem of process economy is solved, and the TiCl4 is efficiently and selectively separated and extracted by performing the reaction in the low-temperature chlorination slag after crushing, and the extraction efficiency of titanium is improved.

A reactor has a double-wall inlet tube for supplying a gas that contains a chlorination agent and also providing a protective gas shrouding at the end of the inlet tube. The reactor includes a reactor vessel with a protective lining on the inside wall. The double-walled inlet tube extends into the reactor vessel through the protective lining. The double-walled chlorine inlet tube has an inner pipe, an outer pipe, and a peripheral space between the inner and outer pipes. The chlorination agent containing gas is injected into the reactor vessel through the inner pipe, and the protective gas is injected simultaneously into the reactor vessel through the outer pipe in the peripheral space between the inner pipe and the outer pipe to form a protective gas shroud around the end of the double-wall inlet tube. The protective gas may be recycled from other portions of the process to reuse various materials produced from carbochlorination process.

The invention relates to the technical field of titanium tetrachloride preparation, in particular to a method for refining titanium tetrachloride, which is characterized in that an organic vanadium removal agent is added into a secondary distillation kettle, so that iron-containing high-boiling-point substances discharged from a primary distillation kettle can directly return to a chlorination furnace, and a slurry evaporation furnace is only used for distilling vanadium-containing high-boiling-point substances discharged from the secondary distillation kettle; therefore, the load of the slurry evaporation furnace is reduced; the grade of the vanadium slag evaporated by the slurry evaporation furnace can be improved, the take-out price of the vanadium slag is increased, and the income is increased; scaling of solid-phase objects on heating equipment can be reduced, the heating efficiency is improved, the service time of the heating equipment is prolonged, meanwhile, the opportunity that the solid-phase objects adhere to a conveying pipeline can be reduced, and the blocking risk is reduced; the chance that the vanadium removal agent, ferric chloride and other substances are sintered on a high-temperature electric heater is reduced, the use amount of the vanadium removal agent is reduced, the discharge amount of high-boiling-point slag is reduced, and meanwhile titanium tetrachloride with the ultralow carbon content is produced.

The present invention relates to a method for removing vanadium from crude titanium tetrachloride using a synergistic catalyst, belonging to the technical field of organic matter-based titanium tetrachloride purification. Organic matter and crude titanium tetrachloride are mixed and stirred at room temperature to obtain a mixed liquid; the synergistic catalyst is added to the mixed liquid, the temperature is raised to 100-130°C, and the mixture is stirred for 1-4 hours to fully react; the synergistic catalyst is composed of an oxide support, a metal chloride complexing agent, and an active metal; the temperature is further raised to 140-160°C, and the titanium tetrachloride is distilled to obtain refined titanium tetrachloride and an easily handled residue. By optimizing the selection of organic matter and adding the synergistic catalyst, the present invention can reduce the formation of agglomerated carbon-containing small molecules, lower the carbon content in the titanium sponge, and thus improve the rigidity and production quality of the titanium sponge.

The invention discloses an acidolysis method in an industrial production process of hydrochloric acid titanium dioxide of high-phosphorus titanium concentrate, which can ensure the industrial production of the hydrochloric acid titanium dioxide acidolysis process system, and can significantly improve the acidolysis rate of titanium concentrate and the concentration of titanium liquid compared with other titanium dioxide production methods. The whole acidolysis process does not produce low-concentration titanium liquid, reduces the amount of hydrochloric acid used, improves the efficiency of reducing iron powder and the stability of the acidolysis titanium liquid, has obvious dephosphorization effect, and is conducive to the preparation of high-quality pigment titanium dioxide.

The present invention relates to the technical field of chemical waste recycling, and in particular to a waste resource processing system and equipment. The waste resource processing system includes: a microwave low-temperature desorption furnace, suitable for heating the waste at a first temperature to obtain a first mixed gas and a first solid residue; a microwave cracking furnace, suitable for heating the first solid residue at a second temperature to obtain a second mixed gas and a second solid residue; a microwave gas-phase catalytic cracking furnace, suitable for heating the first mixed gas and / or the second mixed gas at a third temperature to obtain a third mixed gas; a secondary high-temperature gas-phase cracking furnace, suitable for heating the third mixed gas at a fourth temperature to obtain a fourth mixed gas; the fourth mixed gas is condensed and distilled twice to obtain a high-purity titanium tetrachloride solution. The waste resource processing system provided by the present invention can completely decompose organic matter to obtain high-purity titanium tetrachloride, thereby realizing resource processing of titanium tetrachloride.

The invention discloses a fluidized bed furnace device system suitable for chlorination of high-calcium-magnesium-titanium slag, comprising a fluidized bed furnace body, wherein the upper part of the fluidized bed furnace body is a reaction chamber, the middle part is an expansion chamber, and the lower part is a boiling chamber; a high-voltage pulse-assisted upper slag discharge system is arranged between the boiling chamber and the expansion chamber, and cooperates with an automatic slag discharger connected with a lower slag discharge port to realize effective and clean separation of impurity components such as calcium and magnesium in the fluidized bed, effectively prolong the stability time of the fluidized bed, and ensure sufficient reaction time between the material and chlorine; in addition, a gas distribution chamber is arranged at the lower part of the boiling chamber, and a wind cap sleeve with rectifying small holes is arranged in the gas distribution chamber, and the wind cap sleeve connects the gas distribution chamber and the boiling chamber; a double-flow channel spiral blade is arranged in the wind cap sleeve to realize high-intensity rotary cutting and stirring of the material bed, so that the material and chlorine are fully mixed and reacted; further, a plasma gun ignition device is also arranged in the fluidized bed furnace system to fully realize efficient and fully automatic clean production of titanium tetrachloride gas.

A device and method for efficient clean utilization of fluor carbon cerium ore double chlorination method, relate to the field of rare earth comprehensive utilization and recovery, the device is composed of a first continuous packing bed, pipeline device; second continuous packing bed; third continuous packing bed; first screw propelling type condenser; second screw propelling type condenser. Rare earth concentrate is chlorinated with aluminum chloride, carbon monoxide and chlorine gas generated in the first and second continuous packing beds in the third continuous packing bed. Chlorinated rare earth, aluminum fluoride and alkaline earth metal chlorides generated by chlorination reaction remain in the chlorination slag in solid form, and titanium tetrachloride, silicon tetrachloride and iron chloride leave the chlorination furnace in gaseous form. The gaseous chlorination products are condensed and recovered by the screw propelling type condenser. The solid phase products are separated by water immersion to obtain single rare earth chloride. The present application realizes the comprehensive utilization of rare earth elements and associated elements such as titanium, fluorine, silicon and iron in fluor carbon cerium ore, and no acid and alkali waste liquid and wastewater are generated in the reaction process, which has good environmental benefits.

A metal chloride generator is provided. The metal chloride generator is a metal chloride centrifugal reactor that can be operated under conditions sufficient to cause metal particles and chlorine in the generator to be brought into contact with one another and react using centrifugal force to form metal chloride. A process for manufacturing titanium dioxide that utilizes the metal chloride generator is also provided.

The present invention discloses a method for producing titanium tetrachloride by large-scale molten salt chlorination, 1) a mixture of high titanium slag, sodium chloride and petroleum coke is delivered to a chlorination furnace through a spiral feeder; 2) chlorine is delivered to the bottom of the molten salt in the chlorination furnace through a chlorine spray gun; 3) the chlorination furnace is sprayed with leaching mud for temperature control; 4) the gas pipe of the chlorination furnace is connected to a gas-solid separation device at 14 to 16 m; 5) the direct condensation stage is to spray the dust-collected furnace gas with the crude titanium tetrachloride slurry sprayed by the leaching device; 6) the indirect condensation stage is to condense the furnace gas that has completed direct condensation through a condensation device; 7) refined titanium tetrachloride is obtained; the present invention increases the molten salt chlorination capacity by expanding the chlorination furnace, improves the process control conditions, and reduces its control difficulty. A method for controlling production and improving the chlorination rate is proposed for large-scale chlorination furnaces to meet the needs of the production of later-stage products and avoid the shortcomings of molten salt chlorination.

The invention relates to the field of comprehensive smelting of titanium metal and vanadium metal, in particular to a device and a method for extracting and converting vanadium oxytrichloride from crude titanium tetrachloride. The method comprises the following steps: adding organic matter naphthenic oil in a refining process of crude titanium tetrachloride, and reducing VOCl3 in crude titanium into VOCl2 to enter refined slurry; the method comprises the following steps: firstly recovering TiCl4 in the refined vanadium-containing slurry, and then introducing chlorine gas for heating, so that VOCl2 is converted into VOCl3 gas again; condensing the VOCl3 gas to obtain a VOCl3 liquid; and finally, evaporating the VOCl3, and condensing and recovering the gas VOCl3 to obtain pure liquid VOCl3. The method is continuous in production operation, high in production efficiency, large in capacity, safe, economical and environmentally friendly, two products are creatively produced in a joint mode, the products are diversified through rigorous reaction steps, and a production line does not need to be independently developed.

The invention provides a method for blowing a micro-fine particle grade titanium-rich material in a fluidizing chlorination furnace, which comprises the following steps: step S1, drying and screening the micro-fine particle grade titanium-rich material to obtain titanium-rich material fine powder; s2, conveying the titanium-rich material fine powder to a chlorine pipeline of a boiling chlorination furnace; s3, the titanium-rich material fine powder is fully mixed with chlorine while being conveyed in a chlorine pipeline; and S4, a mixture of the titanium-rich material fine powder and chlorine is blown into a boiling chlorination furnace reaction zone. According to the method for blowing the micro-fine particle-grade titanium-rich material by the fluidizing chlorination furnace, the problem of resource waste caused by the fact that the micro-fine particle-grade titanium-rich material cannot be directly used for production of the fluidizing chlorination furnace is solved, efficient utilization of the micro-fine particle-grade titanium-rich material is realized through the blowing technology, the production cost is reduced, the energy consumption is reduced, and the yield and the quality of titanium tetrachloride are improved.

The invention discloses a method for pre-judging abnormal quality of a titanium tetrachloride distillation system, which comprises the following steps: arranging a trial observation hole on a reflux pipeline of the titanium tetrachloride distillation system, and pre-judging the quality of distillation reflux according to the change of the trial color on the basis that the initial color of the trial color is colorless and transparent. And the work of the distillation system is regulated and controlled according to different colors presented by the trial mirror. According to the method, the trial mirror observation hole is formed in the reflux pipeline of the titanium tetrachloride distillation system, and whether the quality of distillate reflux is abnormal or not is pre-judged according to the color presented by the trial mirror; according to the method, the distillation system does not need to be sampled and detected, and whether the reaction quality in the distillation system is controlled or not can be quickly and accurately judged only by observing the color of the distillate on line in real time through the trial mirror, so that the detection time can be effectively saved, enough regulation and control time can be provided for workers when the quality of the distillation system is abnormal, and the detection efficiency is improved. And unqualified distillates can be prevented from entering the distillation system in time.

The application provides a titanium tetrachloride mother liquor treatment method and system. The method comprises the following steps: introducing the titanium tetrachloride mother liquor, TiO2 solid and HCl gas into a gas-solid-liquid three-phase reactor, and reacting TiO2 and HCl with TiCl4 and alkoxy titanium chloride in the mother liquor to generate titanium oxychloride; after separation, titanium oxychloride solid and gas-liquid phase materials are obtained; the titanium oxychloride solid is heated and decomposed to generate TiCl4 gas and TiO2 solid, and TiCl4 liquid is obtained after condensation of the TiCl4 gas. The system comprises a gas-solid-liquid three-phase reactor, a separation device, a thermal decomposition reactor and a condenser, etc. The method and system realize low-cost and efficient recovery of the titanium tetrachloride mother liquor.

The application provides a method for preparing titanium tetrachloride by using a fluidized bed, wherein the powder fluidization area and the cooling area are alternately arranged in the fluidized bed, the whole is in a rectangular structure, the powder material is added from one side of the fluidized bed, and is sequentially overflowed through several fluidization areas and cooling areas and then discharged from the outlet; the fluidization gas enters the fluidized bed through the distribution plate at the bottom of the fluidization area, and reacts with the added powder particles at a certain temperature to prepare titanium tetrachloride; and the cooling medium is sent from the bottom of the fluidized bed and discharged from the top outlet after heat exchange. The method uses the slag containing titanium carbide, titanium nitride or titanium carbonitride as the raw material, and reacts with chlorine gas, so that the reaction efficiency is high; the fluidized bed adopts the cross design of the fluidization area and the cooling area, so that the heat released by the chlorination reaction is discharged from the fluidized bed through the cooling medium in time, and the local heat release of the reaction is avoided, and the sintering of the material or even the dead furnace condition is avoided.

The invention discloses a pretreatment method for sub-millimeter rutile powder granulation, which comprises the following steps: (1) uniformly mixing sub-millimeter rutile powder and a binder to obtain a mixed raw material; (2) pretreating the mixed raw material by adopting one or a combination of more of high-pressure roller milling, wet milling and strong mixing, so that the raw material and the binder fully act and are tightly combined to obtain a pretreated raw material; (3) putting the pretreated raw materials into a granulator, and granulating; and (4) drying and curing the pelletized product to obtain the product. The invention provides a pretreatment method for sub-millimeter rutile powder granulation, which is suitable for all granulation processes at present. The submillimeter rutile powder is subjected to high-pressure roller grinding, wet grinding and strong mixing pretreatment, so that the use amount of a binder is reduced, and the granulation effect is improved. And the granulated product is uniform in particle size distribution and good in strength, and can be applied to a fluidizing chlorination furnace. The granulation method is high in qualified rate, and the granulation process is simple in procedure and environment-friendly.

The invention discloses a boiling chlorination furnace top chlorine introducing pipeline and blockage control device and method. The control device comprises a furnace body top, a four-way joint, a quenching pipe, a cyclone separator, a chlorine introducing device and a nitrogen introducing device, wherein the four-way joint, the quenching pipe and the cyclone separator are sequentially connected with the furnace body top; the chlorine introducing device is connected with the furnace body top and the four-way joint; the system further comprises a furnace top pressure transmitter connected with the top of the furnace body and a quenching pressure transmitter connected with the quenching pipe. The control method mainly comprises the following steps: starting a chlorine introduction regulating valve to introduce chlorine into a furnace top and a four-way joint thereof, introducing nitrogen into a chlorine introduction pipeline to purge and take away residual deposits accumulated in the chlorine introduction pipeline in order to enable the pipeline to be smooth, so that a quenching pipe is in a smooth state, and continuous and stable operation of chlorination production is realized. The device has the beneficial effects that the device is scientific in design, easy to implement and convenient to popularize and apply, the overhaul period of the quenching pipe can be greatly prolonged, the effective utilization rate of raw materials is remarkably increased, and therefore the output of titanium tetrachloride is increased.

The invention relates to the technical field of chemical engineering, and discloses a denitration slag recycling method which comprises the following steps: 1) fully mixing a waste denitration slag catalyst with high-concentration strong alkali, leaching, and carrying out solid-liquid separation; (2) refining the leachate; (3) washing and roasting the leaching residues by using H2SO4; (4) mixing the denitration slag and the titanium slag according to the proportion, and conveying the mixture to a middle stock bin to be fully and uniformly mixed after matching; 5) conveying petroleum coke and sodium chloride to an intermediate bin; 6) a material consumption proportioning scheme; 7) chlorination reaction; and (8) waste fused salt and dust collection slag are recycled. Vanadium in the denitration catalyst is recycled and utilized in the early stage, the content of vanadium oxytrichloride generated by chlorination is low, the use amount of vanadium removal oil can be reduced in the refining process, the content of C in titanium tetrachloride can be reduced, then the content of C in titanium sponge is controlled, and the quality of the titanium sponge is improved; the production cost is reduced, the pollution to the environment is reduced, and the requirement of the green development concept is met.

The invention belongs to the technical field of chemical chlorination equipment, and particularly relates to equipment for preparing artificial rutile from titanium slag, which comprises a chlorination furnace and a chlorine spray gun mounted on the chlorination furnace, the device comprises a chlorine spray gun and a switching valve, the chlorine spray gun is arranged in the chlorine spray gun, the chlorine spray gun is internally provided with a backflow dredging mechanism, and the backflow dredging mechanism dredges the chlorine spray gun by controlling backflow of molten salt. On the other hand, due to the fact that the two states of the ventilation cavity and the backflow cavity of the cavity are alternately switched, molten salt backflow cleaning can be periodically conducted in the long-time using process of the cavity, and then an attached salt layer is removed; and long-term operation of titanium slag chlorination operation is maintained.