CN109439918B - System for extracting titanium, iron, aluminum and magnesium components in high-titanium slag through fractional roasting - Google Patents

System for extracting titanium, iron, aluminum and magnesium components in high-titanium slag through fractional roasting Download PDF

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CN109439918B
CN109439918B CN201811349750.4A CN201811349750A CN109439918B CN 109439918 B CN109439918 B CN 109439918B CN 201811349750 A CN201811349750 A CN 201811349750A CN 109439918 B CN109439918 B CN 109439918B
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titanium
roasting
slag
iron
magnesium
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CN109439918A (en
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孙红娟
何思褀
彭同江
丁文金
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Southwest University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/06—Sulfating roasting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/08—Chloridising roasting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0038—Obtaining aluminium by other processes
    • C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/20—Obtaining alkaline earth metals or magnesium
    • C22B26/22—Obtaining magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/1218—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by dry processes
    • C22B34/1222—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by dry processes using a halogen containing agent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/002—Dry processes by treating with halogens, sulfur or compounds thereof; by carburising, by treating with hydrogen (hydriding)
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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Abstract

The invention provides a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by virtue of sectional roasting, which comprises a batching unit, a roasting unit, a water leaching unit, a fractional precipitation unit and a condensing unit, wherein the batching unit is used for mixing the high-titanium slag and an auxiliary agent to obtain a material to be roasted; the roasting unit is used for roasting the material to be roasted at low temperature and at high temperature; the water leaching unit is used for performing water leaching treatment on the roasting slag, and obtaining filter residue and first filtrate containing aluminum ions and magnesium ions after solid-liquid separation; the fractional precipitation unit is used for fractional precipitation of the first filtrate to complete extraction of aluminum components and magnesium components in the high titanium slag; and the condensing unit is used for carrying out temperature control desublimation treatment on the enriched gas containing the iron and titanium components to finish the extraction of the iron component and the titanium component in the high-titanium slag. The system can realize the sectional roasting of the high titanium slag to extract the components of titanium, iron, aluminum and magnesium in the high titanium slag, and has the advantages of simple system operation, short process, high efficiency and low cost.

Description

System for extracting titanium, iron, aluminum and magnesium components in high-titanium slag through fractional roasting
Technical Field
The invention belongs to the field of metallurgical chemical industry, and particularly relates to a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by virtue of sectional roasting.
Background
The annual steel yield of Panzhihua steel plant can reach 1000 ten thousand tons, and the amount of the produced high-titanium blast furnace slag can reach 360 ten thousand tons. At present, the accumulation amount of the high titanium blast furnace slag is 6000 million tons. The large accumulation of the high titanium blast furnace slag not only occupies the land, but also the leachate enters surface water and underground water to cause water pollution, and the leachate has certain toxicity and is diffused to the surrounding soil to cause the damage of farmland dealers, thereby forming 'red land'. The wind blows fine slag particles to cause dust raising, and causes pollution to the air in the local area and the lower tuyere area. Moreover, the high titanium blast furnace slag accumulated on two banks of the Jinshajiang river is easy to cause landslide under the washing of rainwater, so that the method is an uncontrollable potential safety hazard, and the accumulation of a large amount of high titanium blast furnace slag becomes a great pollution source for local environment and geology.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the purposes of the invention is to provide a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by sectional roasting, which has simple equipment and reliable process flow.
In order to achieve the aim, the invention provides a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by virtue of sectional roasting, which can comprise a batching unit, a roasting unit, a water leaching unit, a fractional precipitation unit and a condensation unit, wherein the batching unit is used for mixing the high-titanium slag and an auxiliary agent to obtain a material to be roasted, and the auxiliary agent is a mixture of chloride and sulfate; the roasting unit is used for roasting a material to be roasted at low temperature and high temperature, the low-temperature roasting comprises roasting the material to be roasted at the temperature of 100-400 ℃ to obtain a first material containing enriched gas of iron and titanium components and aluminum and magnesium components, and the high-temperature roasting comprises roasting the first material containing the aluminum and magnesium components at the temperature of 400-800 ℃ to obtain roasting slag; the water leaching unit is used for performing water leaching treatment on the roasting slag, and obtaining filter residue and first filtrate containing aluminum ions and magnesium ions after solid-liquid separation; the fractional precipitation unit is used for fractional precipitation of the first filtrate containing the aluminum ions and the magnesium ions to complete extraction of aluminum components and magnesium components in the high-titanium slag; and the condensing unit is used for carrying out temperature control desublimation treatment on the enriched gas containing the iron and titanium components to finish the extraction of the iron component and the titanium component in the high-titanium slag.
In one exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by means of segmented roasting according to the present invention, the roasting unit may comprise a roasting kiln externally connected with a first gas collecting device for collecting enriched gas containing iron and titanium components and auxiliary agent gas for sublimation and/or decomposition.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by means of staged roasting according to the present invention, the condensing unit may include a condenser, one end of the condenser is connected to the first gas collecting device, the other end of the condenser is connected to a second gas collecting device, the sublimed and/or decomposed auxiliary agent gas and the iron-containing component gas in the iron-containing and/or titanium component enriched gas can be recrystallized at different positions in the wall of the condenser tube to achieve extraction of iron components and recovery of the sublimed and/or decomposed auxiliary agent gas, and the second gas collecting device can collect the titanium-containing component gas in the iron-containing and titanium component enriched gas which cannot be recrystallized in the wall of the condenser tube.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by staged roasting, the condenser can be one or more of a spray condenser, a filling condenser, a water spray plate condenser and a sieve plate condenser.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by staged roasting, the system may further include a recovery unit, and the recovery unit is configured to recover and reuse filter residues obtained by the water leaching unit to prepare portland cement.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high-titanium slag by staged roasting, the high-titanium slag can be water-quenched high-titanium blast furnace slag, and the components of the water-quenched high-titanium blast furnace slag comprise, by mass percent, Fe2O32 to 8 percent of TiO210-25% of Al2O3The content is 8-15%, and the content of MgO is 5-12%.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high-titanium slag by staged roasting, the high-titanium slag can be tailings obtained by high-temperature carbonization and low-temperature chlorination of titanium-containing blast furnace slag obtained by blast furnace smelting of vanadium titano-magnetite.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by staged roasting, the mass ratio of the high titanium slag to the auxiliary agent can be 0.1-10: 1.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by staged roasting of the invention, the staged precipitation may include: adding a first precipitator into the first filtrate, adjusting the pH to 4.0-6.0 at 25-70 ℃, stirring and filtering to obtain aluminum hydroxide powder and a second filtrate rich in magnesium, wherein the first precipitator is one or a combination of aluminum hydroxide and ammonia water; adding a second precipitator into the second filtrate rich in the magnesium component, adjusting the pH value to 9.0-12.0 at 25-70 ℃, stirring and filtering to obtain magnesium hydroxide powder, wherein the second precipitator is one or a combination of magnesium hydroxide and ammonia water.
In an exemplary embodiment of the system for extracting titanium, iron, aluminum and magnesium components from high-titanium slag by means of staged roasting, the water leaching treatment may include performing water leaching treatment on the roasted slag by using a water leaching solution in a stirring process, wherein a volume-to-mass ratio of the water leaching solution to the roasted slag is 0.5-100: 1, and the water leaching treatment temperature is 20-100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the system can realize the sectional roasting of the high titanium slag to extract the components of titanium, iron, aluminum and magnesium in the high titanium slag, and has the advantages of simple system operation, short process, high efficiency and low cost;
(2) the system disclosed by the invention is environment-friendly for extracting components of the high-titanium slag, and avoids resource waste caused by using a large amount of sulfuric acid and adverse effects on the environment caused by sulfuric acid mist formation compared with the traditional acidolysis method for extracting valuable components;
(3) the system of the invention is used for treating TiO in high titanium slag2、Fe2O3、Al2O3The extraction rate of MgO can reach 50% -98%, and the prepared products meet or are higher than the national (industrial) standard;
(4) the system provided by the invention can be used for extracting components from the high titanium slag, so that the residual tailings can meet the requirements of portland cement, can be directly used in building material production, does not generate residues with large environmental pollution, and is green and environment-friendly.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a schematic diagram of a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by means of sectional roasting according to an exemplary embodiment of the invention.
Detailed Description
Hereinafter, a system for extracting titanium, iron, aluminum and magnesium components from high titanium slag by means of sectional roasting according to the invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
FIG. 1 shows a schematic diagram of a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by means of sectional roasting according to an exemplary embodiment of the invention.
The invention provides a system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by sectional roasting, and in one exemplary embodiment of the system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag by sectional roasting of the invention, as shown in fig. 1, the system can comprise a batching unit, a roasting unit, a water leaching unit, a fractional precipitation unit and a condensation unit, wherein,
the batching unit is used for mixing and batching the high titanium slag and the auxiliary agent to obtain a material to be roasted. The roasting unit is used for roasting materials to be roasted in a segmented mode so that titanium, iron, aluminum and magnesium components in the high-titanium slag exist in different states, and separation and extraction in the later period are facilitated. The water leaching unit is used for performing water leaching treatment on the roasting slag obtained by the roasting unit to obtain filter residue and first filtrate containing aluminum ions and magnesium ions. The fractional precipitation unit is used for fractional precipitation of the first filtrate containing the aluminum ions and the magnesium ions to complete extraction of the aluminum components and the magnesium components in the high-titanium slag. The condensing unit is used for carrying out temperature control desublimation treatment on the enriched gas containing the iron and titanium components so as to extract the iron component and the titanium component in the high-titanium slag.
In this embodiment, the roasting unit comprises a roasting kiln of an improved type for roasting the material to be roasted at a low temperature and a high temperature. The improved roasting kiln is a roasting kiln which is externally connected with a first gas collecting device. The first gas collection device may be used to collect gas generated during the firing process. The gas may include an iron and titanium-containing component enriched gas, and a sublimed and/or decomposed auxiliary gas. The enriched gas containing the iron and titanium components is obtained by reacting an auxiliary agent with the iron component and the titanium component in the high-titanium slag.
In this example, the staged firing was first performed by low-temperature firing. During the roasting process, part of the auxiliary agent is decomposed and/or sublimated due to the roasting temperature, and is in a gaseous state to be mixed with the iron and titanium component enriched gas. The other part of the auxiliary agent reacts with the high titanium slag to obtain enriched gas containing iron and titanium components and a first material containing aluminum and magnesium components. The first material containing the aluminum and magnesium components does not contain iron and titanium components. The first material containing the aluminum and magnesium components can form roasting slag after high-temperature roasting.
The heating rate of the low-temperature roasting can be 1-10 ℃/min, and the low-temperature roasting temperature can be 100-400 ℃. Preferably, the heating rate can be 3 ℃/min to 8 ℃/min, and the low-temperature roasting temperature can be 180 ℃ to 340 ℃. The holding time for the low-temperature baking may be determined according to the actual baking amount or phenomenon, and for example, the holding time may be 0.1 to 5 hours, but the holding time in the present invention is not limited thereto. After the low-temperature roasting is completed, the first material containing the aluminum and magnesium components needs to be subjected to high-temperature roasting treatment. The heating rate of the high-temperature roasting can be 1-10 ℃/min, and the high-temperature roasting temperature can be 400-800 ℃. Preferably, the heating rate can be 3 ℃/min to 7.8 ℃/min, and the high-temperature roasting temperature can be 420 ℃ to 750 ℃. The holding time for the high-temperature baking may be determined according to the actual baking amount or phenomenon, and for example, the holding time may be 0.1 to 5 hours, but the holding time for the high-temperature baking of the present invention is not limited thereto.
In the above, the advantage of setting the above roasting process is that the Fe and Ti components in the slag react with the chloride salt assistant to the highest extent in the temperature range of low-temperature roasting. In the temperature range of high-temperature roasting, the Al and Mg components in the slag have the highest reaction degree with the sulfate auxiliary agent. The difference of the reaction activity can realize the sequential extraction of Fe, Ti, Al and Mg in different temperature ranges. For the heating rate of roasting, the heating rate is too slow, the reaction time is long, the energy consumption is too high, the heating rate is too fast, the reaction is insufficient, and the extraction of Fe, Ti, Al and Mg is not facilitated.
In this embodiment, the high titanium slag may be water-quenched high titanium blast furnace slag, for example, preferably, water-quenched high titanium blast furnace slag which is solid waste generated in a blast furnace smelting process of vanadium titano-magnetite. Wherein the water-quenched high-titanium blast furnace slag may include, in mass percent, Fe2O32 to 8 percent of TiO210-25% of Al2O3The content is 8-15%, and the content of MgO is 5-12%. Preferably, the water-quenched high-titanium blast furnace slag may include, in terms of mass percent, Fe2O32 to 8 percent of TiO210-25% of Al2O3The content is 8-15%, and the content of MgO is 5-12%. When the water-quenched high-titanium blast furnace slag is used as a raw material, the water-quenched high-titanium blast furnace slag needs to be dried and crushed before the auxiliary agent is mixed because the humidity of the raw material is high. The purpose of the crushing is to mix more evenly with the aid. For example, the drying temperature may be 60 to 90 ℃, and preferably, the drying temperature may be 67 to 84 ℃. The drying time can be confirmed according to the actual drying effect on site, and for example, the drying time can be 6 to 12 hours. Of course, the drying time of the present invention is not limited thereto. The method of the invention is suitable for any high-titanium slag containing titanium, iron, aluminum and magnesium components.
In this embodiment, the high titanium slag may be tailings obtained by high temperature carbonization-low temperature chlorination of titanium-containing blast furnace slag obtained by blast furnace smelting of vanadium titano-magnetite. The tailings are used as raw materials, and if the tailings are just discharged from a furnace, the tailings discharged after low-temperature chlorination have high temperature, so that the tailings do not need to be dried. If the tailings are placed for a period of time, because the tailings containing titanium are very easy to absorb water, the tailings after being placed need to be dried, and likewise, the drying temperature can be 60-90 ℃, and preferably, the drying temperature can be 67-84 ℃.
In this embodiment, the auxiliary agent may be a mixed auxiliary agent composed of a chloride salt and a sulfate salt. The chloride salt may be ammonium chloride (NH)4Cl), sodium chloride (NaCl), calcium chloride (CaCl)2) And aluminum chloride (AlCl)3) One or a combination of two or more of them. The sulfate may be ammonium sulfate ((NH)4)2SO4) Ammonium hydrogen sulfate (NH)4HSO4) And sulfuric acid (H)2SO4) Wherein H is2SO4The mass fraction of (b) may be 20% to 98%. In the case of a mixed adjuvant consisting of chloride and sulfate, the chloride acts mainly in the low-temperature roasting stage, generating iron chloride and titanium chloride. The sulfate acts mainly in the high temperature roasting stage to produce aluminum sulfate and magnesium sulfate. The mass ratio of chloride to sulfate in the mixed auxiliary agent is not strictly required, and the titanium, iron, aluminum and magnesium components in the raw materials can be ensured to have enough reaction of chloride and sulfate. In the present invention, salts other than the above-mentioned salts can be selected as the chloride salt and the sulfate salt. For example, the chloride salt may be potassium chloride or the like, and the sulfate salt may be potassium sulfate or the like. However, the addition of different auxiliaries can affect the composition of the filter residue produced in the process of the invention, which is disadvantageous for the preparation of portland cement from filter residues, and the inclusion of other elements can destroy the properties of portland cement. Thus, preferably, the chloride salt of the present invention may be ammonium chloride (NH)4Cl), sodium chloride (NaCl), calcium chloride (CaCl)2) And aluminum chloride (AlCl)3) One or a combination of two or more of them. The sulfate may beAmmonium sulfate ((NH)4)2SO4) Ammonium hydrogen sulfate (NH)4HSO4) And sulfuric acid (H)2SO4) Wherein H is2SO4The mass fraction of (b) may be 20% to 98%. In the invention, the chloride in the auxiliary mainly acts on the low-temperature roasting stage, and the sulfate auxiliary mainly acts on the high-temperature roasting stage. For titanium and iron components contained in the high titanium slag, corresponding titanium tetrachloride and ferric trichloride are generated. Therefore, the enriched gas of the iron and titanium components can be a mixed gas of titanium tetrachloride and ferric trichloride.
In the embodiment, the mass ratio of the high titanium slag to the mixed auxiliary agent of chloride and sulfate can be 1: 0.1-10. Preferably, the mass ratio may be 1:1 to 8.
In this embodiment, the particle size of the material to be roasted may be 80% or more of the particles satisfying 30 μm to 200 μm. Preferably, 80% or more of the particles satisfy 50 μm to 160 μm. The particle size is set to facilitate the uniform mixing of the raw materials and the auxiliary agent, thereby being beneficial to the full implementation of the roasting reaction.
In this example, since the boiling points of chlorides formed by the respective elements are different, the iron component and the titanium component become gases after the low-temperature roasting, while the aluminum component and the magnesium component remain in the first material, and the aluminum component and the magnesium component are converted into soluble sulfates after the high-temperature roasting of the first material. Therefore, the aluminum component and the magnesium component in the high titanium slag are enriched in the roasted slag. And the components such as calcium, silicon and the like contained in the high titanium slag are also enriched in the roasting slag due to the high boiling point. Therefore, the calcine slag contains calcium, silicon, magnesium and aluminum components.
In this example, the water leaching of the calcine slag was carried out with continuous stirring. Preferably, the water immersion liquid can be one or more of industrial water, tap water or distilled water. Of course, the aqueous immersion fluid used in the present invention is not limited thereto. The volume-mass ratio (the proportion unit can be mL/g) of the water extract to the roasting slag can be 0.5-100: 1. Preferably, the volume-to-mass ratio can be 6-80: 1. The temperature of the water immersion may be 20 ℃ to 100 ℃, preferably, 25 ℃ to 100 ℃. The time for water leaching can be determined according to the actual amount of the roasting slag, and for example, the time for water leaching can be 0.1h to 5.0 h. The advantages of setting the volume-mass ratio and the water immersion temperature are that the water immersion of the roasting slag can be ensured to be complete, the reasonable utilization of resources can be ensured, and the waste is avoided.
In this embodiment, the distributed precipitation may include two stages. The first stage may include adding a first precipitant to the first filtrate, adjusting the pH to 4.0-6.0 at 25-70 deg.C, stirring, and filtering to obtain aluminum hydroxide powder (Al (OH)3) And a second filtrate rich in the magnesium component to complete the extraction of the aluminum component. Preferably, the precipitation can be carried out under the condition that the pH is adjusted to 4.3-5.4 at the temperature of 28-62 ℃. The first precipitator can be one or two of aluminum hydroxide and ammonia water. The mixing and stirring time can be 1 min-120 min, and the stirring time can be determined according to empirical values or on site. The filtration in the first stage precipitation can adopt one or the combination of more than two of natural sedimentation, suction filtration or filter pressing.
In the second stage, a second precipitator can be added into the second filtrate rich in the magnesium component, the pH is adjusted to 9.0-12.0 at the temperature of 25-70 ℃, and the mixture is stirred and filtered to obtain magnesium hydroxide powder (Mg (OH)2) And a third filtrate, completing the extraction of the magnesium component. Preferably, the pH is adjusted to 9.4 to 11.3 at 28 ℃ to 63 ℃. The second precipitator may be one or a combination of magnesium hydroxide and ammonia water. The mixing and stirring time can be 1 min-120 min, and the stirring time can be determined according to empirical values or on site. The filtration in the second stage of precipitation can adopt one or more of natural sedimentation, suction filtration or filter pressing.
In this example, the third filtrate contains a sulfate adjuvant due to the presence of the sulfate adjuvant. And the sulfate auxiliary agent can be recovered after the third filtrate is recrystallized and is used in the roasting stage, so that the recovery and the reutilization of the auxiliary agent are realized.
In this embodiment, the extraction method of the present invention can achieve extraction rates of 50% to 98% for titanium dioxide, iron sesquioxide, aluminum oxide and magnesium oxide in the high titanium slag.
In this embodiment, the condensing unit includes a condenser. One end of the condenser is connected with the first gas collecting device, and the other end of the condenser is connected with the second gas collecting device. The sublimed and/or decomposed auxiliary agent gas and the iron-containing component gas in the enriched gas containing iron and titanium components can be recrystallized at different positions in the wall of the condenser tube to realize the extraction of the iron component and the recovery of the sublimed and/or decomposed auxiliary agent gas. The second gas collecting device is capable of collecting the titanium-containing component gas in the iron-and titanium-containing component enriched gas that has not been recrystallized in the condenser tube wall. The separation of the iron component and the titanium component is carried out by temperature-controlled desublimation, i.e. temperature-controlled condensation. The desublimation is a phenomenon that a substance is directly changed from a gas state to a solid state by jumping over a liquid state, condensation is a process that the temperature of a hot object is reduced and phase change occurs, and the condensation is an operation mode for realizing desublimation in the invention. In the condensation process, the condenser can be used for condensing the enriched gas of the iron and titanium components. Because the iron and titanium component enriched gas is mixed with the sublimation and/or decomposition gas of the auxiliary agent, the auxiliary agent gas and the iron component (ferric chloride) gas which are sublimated and/or decomposed in the condensation process are recrystallized at different positions of the wall of the condenser tube, the recrystallized iron component can be scraped out, the iron-containing fixation (ferric chloride solid) is obtained, and the extraction of the iron component is completed. The recrystallized aid can be recycled for use in the calcination stage. After recrystallization, the sulphate and chloride salts are obtained and then reused in the roasting stage of the invention. Since the solidifying points of the titanium component gas and the iron component gas are different, the titanium component gas is not solidified in the condenser. It is necessary to collect the titanium component gas after the condenser and collect the titanium component gas (titanium tetrachloride gas) with a liquid absorbent to obtain a hydrous titanium oxide solution (TiO gas)2·nH2O), the extraction of the titanium component is completed. The liquid absorbing liquid can be one or more of industrial water, tap water or distilled water.
In this embodiment, the condenser is one or more of a spray condenser, a fill condenser, a shower plate condenser, and a sieve plate condenser.
In this embodiment, the system further comprises a recovery unit, and the recovery unit is used for recovering and reusing the filter residue obtained by the water leaching unit to prepare the portland cement. The roasting slag contains calcium, silicon, magnesium, aluminum and other components. During completion of the water leaching, magnesium and aluminum components enter the first filtrate, while calcium and silicon enter the filter residue. Because of the presence of the sulfate in the adjuvant, and the sulfate mainly acts on high-temperature roasting, the calcium and silicon components are mainly in the form of calcium sulfate and amorphous silicon dioxide. The filter residue is rich in silicon and calcium components, so that the requirement of the portland cement is met, and the filter residue can be directly applied to the portland cement.
In conclusion, the system can realize the sectional roasting of the high-titanium slag to extract the components of titanium, iron, aluminum and magnesium in the high-titanium slag, and has the advantages of simple system operation, short process, high efficiency and low process cost; compared with the traditional acidolysis method for extracting valuable components, the method has the advantages that the method is environment-friendly, and avoids resource waste caused by using a large amount of sulfuric acid and adverse effects on the environment caused by sulfuric acid mist formation; for TiO in high titanium slag2、Fe2O3、Al2O3The extraction rate of MgO can reach 50% -98%, and the prepared products meet or are higher than the national (industrial) standard; the tailings left after the components of the high titanium slag are extracted meet the requirements of portland cement, can be directly used in building material production, does not generate residues with large environmental pollution, and is green and environment-friendly.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. A system for extracting titanium, iron, aluminum and magnesium components in high-titanium slag by sectional roasting is characterized by comprising a batching unit, a roasting unit, a water leaching unit, a fractional precipitation unit and a condensing unit, wherein,
the batching unit is used for mixing the high titanium slag and an auxiliary agent to obtain a material to be roasted, wherein the auxiliary agent is a mixture of chloride and sulfate;
the roasting unit is used for sequentially roasting materials to be roasted at low temperature and high temperature, the low-temperature roasting comprises roasting the materials to be roasted at the temperature of 100-400 ℃ to obtain enriched gas containing iron and titanium components and first materials containing aluminum and magnesium components, and the high-temperature roasting comprises roasting the first materials containing aluminum and magnesium components at the temperature of 400-800 ℃ to obtain roasting slag;
the water leaching unit is used for performing water leaching treatment on the roasting slag, and obtaining filter residue and first filtrate containing aluminum ions and magnesium ions after solid-liquid separation;
the fractional precipitation unit is used for fractional precipitation of the first filtrate containing the aluminum ions and the magnesium ions to complete extraction of aluminum components and magnesium components in the high-titanium slag;
the condensing unit is used for carrying out temperature control desublimation treatment on the enriched gas containing the iron and titanium components to finish the extraction of the iron component and the titanium component in the high-titanium slag, wherein,
the roasting unit comprises a roasting kiln externally connected with a first gas collecting device, and the first gas collecting device is used for collecting enriched gas containing iron and titanium components and sublimed and/or decomposed auxiliary agent gas;
the condensing unit includes the condenser, the one end of condenser with first gas collecting device is connected, and the other end is connected with second gas collecting device, the auxiliary agent gas of sublimation and/or decomposition and the iron content component gas in iron content, the titanium component enrichment gas in can be at the different positions recrystallization in the condenser pipe wall to realize the extraction of iron component and the recovery of sublimation and/or decomposed auxiliary agent gas, second gas collecting device can collect the titanium component gas in the iron content, the titanium component enrichment gas that can not recrystallize in the condenser pipe wall.
2. The system for extracting the components of titanium, iron, aluminum and magnesium from the high-titanium slag through sectional roasting according to claim 1, wherein the condenser is one or more of a spray condenser, a filling condenser, a water spray plate condenser and a sieve plate condenser.
3. The system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag through sectional roasting according to claim 1, further comprising a recovery unit, wherein the recovery unit is used for recovering and reusing filter residues obtained by the water leaching unit to prepare portland cement.
4. The system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag through sectional roasting according to claim 1, wherein the high-titanium slag is water-quenched high-titanium blast furnace slag, and the components of the water-quenched high-titanium blast furnace slag comprise, by mass percent, Fe2O32 to 8 percent of TiO210-25% of Al2O3The content is 8-15%, and the content of MgO is 5-12%.
5. The system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag through segmented roasting according to claim 1, wherein the high-titanium slag is tailings obtained by high-temperature carbonization and low-temperature chlorination of titanium-containing blast furnace slag obtained by blast furnace smelting of vanadium titano-magnetite.
6. The system for extracting titanium, iron, aluminum and magnesium components from high-titanium slag through segmented roasting according to claim 1, wherein the mass ratio of the high-titanium slag to the auxiliary agent is 0.1-10: 1.
7. The system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag through subsection roasting according to claim 1, wherein the fractional precipitation comprises:
adding a first precipitator into the first filtrate, adjusting the pH to 4.0-6.0 at 25-70 ℃, stirring and filtering to obtain aluminum hydroxide powder and a second filtrate rich in magnesium, wherein the first precipitator is one or a combination of aluminum hydroxide and ammonia water;
adding a second precipitator into the second filtrate rich in the magnesium component, adjusting the pH value to 9.0-12.0 at 25-70 ℃, stirring and filtering to obtain magnesium hydroxide powder, wherein the second precipitator is one or a combination of magnesium hydroxide and ammonia water.
8. The system for extracting components of titanium, iron, aluminum and magnesium from high-titanium slag through sectional roasting according to claim 1, wherein the water leaching treatment comprises the step of performing water leaching treatment on the roasted slag through a water leaching solution in a stirring process, the volume-mass ratio of the water leaching solution to the roasted slag is 0.5-100: 1, and the temperature of the water leaching treatment is 20-100 ℃.
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