Dechlorination and decarbonization method for titanium extraction tailings through multi-phase reaction cooperation

A technology for extracting titanium tailings and multiphase reaction, applied in chemical instruments and methods, chlorine/hydrogen chloride, preparation with chloride, etc., can solve problems such as high cost of high-temperature calcination, low dechlorination efficiency, and activity of destructed slag. Achieve the effects of improving dechlorination efficiency, reducing the impact of glass phase and activity, and reducing reaction time

Inactive Publication Date: 2019-08-16
CHONGQING UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crude dechlorination process based on low-temperature water washing produces a large amount of chlorine-containing wastewater, which is not only inefficient but also difficult to handle; the deep dechlorination technology based on high-temperature calcination greatly destroys the glass in the tailings of titanium extraction while dechlorinating Phase, poor activity, and generally high cost of high temperature calcination
CN106350623A discloses a high-temperature calcination treatment method. In order to maintain the hydration activity of the titanium extraction tailings for reuse, the process of hot-melt heat preservation-water quenching is added, and the process is more complicated. The similar CN106399604A discloses high-temperature calcination treatment In general, the process of hot-melt heat preservation-water quenching is canceled, and the calcination temperature is adjusted. Correspondingly, the effect of dechlorination and decarburization efficiency and the guarantee of hydration activity should be reduced.
CN108315512A discloses a method of dechlorination and decarburization by compressing air and hot titanium tailings in a fluidized fluidized furnace to form a semi-suspended state in the furnace, and decomposing chlorides by burning residual carbon and raising the temperature. The temperature is raised above the decomposition temperature of chlorides, and there is antagonism between the heat released by burning carbon and the heat absorbed by the decomposition of chlorides, and there are problems such as low dechlorination efficiency and high temperature destruction of slag activity.

Method used

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  • Dechlorination and decarbonization method for titanium extraction tailings through multi-phase reaction cooperation

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Experimental program
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Effect test

Embodiment 1

[0033] The low-temperature boiling chlorination titanium extraction tailings with a discharge temperature of 450°C, below 160 mesh, are discharged from the slag outlet and directly added to the fluidized bed reactor, and air is supplied as fluidized gas and carbon is burned. In the fluidized bed reactor, the titanium extraction tailings are fluidized and reacted to burn carbon to heat up, and the CO produced 2 The gas is precipitated from the tailings, and the carbon is burned with oxygen for 15 minutes, and the surface temperature of the titanium extraction tailings is controlled to be 510°C; the air supply is kept and the temperature is 15m 3 / h into, spray into 155 ℃ water vapor (according to the standard condition 0.4m 3 / h) React with calcium and magnesium chloride on the hot tailings surface interface, dissolve and evaporate to dechlorinate, and precipitate from the tailings in the form of HCl gas. The temperature during the treatment process is controlled at 505-555 ° C,...

Embodiment 2

[0035] The low-temperature boiling chlorination titanium extraction tailings with a discharge temperature of 540°C, below 200 mesh, are discharged from the slag outlet and directly added to the fluidized bed reactor, and the air used as the fluidizing gas is fed and carbon is burned to supply Oxygen burning carbon treatment for 10 minutes, control the surface temperature of titanium extraction tailings to 590 ° C, keep air supply and 15m under standard conditions 3 / h into, spray into 175 ℃ water vapor (according to the standard condition 0.43m 3 / h), the temperature of the treatment process was controlled at 555-595°C, and the treatment was maintained for 10 minutes; the specific treatment results are shown in Table 1.

Embodiment 3

[0037] Low-temperature boiling chloride titanium extraction tailings with a discharge temperature of 510°C, below 300 mesh, are discharged from the slag outlet and directly added to the fluidized bed reactor. The surface temperature of the hot titanium extraction tailings is 505-510°C , higher than 500°C, you can choose to directly operate step 2), and the access is 10m under standard conditions 3 / h of air, while spraying water vapor at 195°C (0.3m under standard conditions 3 / h), the temperature during the treatment process was controlled at 505-555°C, and the treatment was maintained for 10 minutes; the specific treatment results are shown in Table 1.

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Abstract

The invention relates to a dechlorination and decarbonization method for titanium extraction tailings through cooperation of a multiphase reaction. The method comprises the following steps: (1) feeding titanium extraction tailings are into a fluidized bed reactor and feeding oxygen-containing gas into the fluidized bed reactor to be subjected to oxygen supply and carbon burning treatment, whereinthe oxygen-containing gas serves as fluidization gas at the same time, and the surface temperature of the titanium extraction tailings in the oxygen supply and carbon burning treatment process is controlled to range from 500 DEG C to 600 DEG C; and (2) maintaining feeding oxygen-containing gas, feeding low-temperature water vapor at the temperature of 150-200 DEG C into the fluidized bed reactor to generate corrosion evaporation on the surface of the titanium extraction tailings to achieve the dechlorination purpose, wherein the surface temperature of the titanium extraction tailings in the oxygen supply carbon burning and corrosion evaporation treatment process is controlled to range from 500 DEG C to 600 DEG C. The waste heat of the titanium extraction tailings is fully utilized, air isintroduced for fluidized reaction carbon burning, heating and decarburization, water vapor is added for corrosion evaporation dechlorination, and a fluidization treatment mode of tailing-air-water vapor multiphase flowing and multiphase interface reaction effect matching is established. The method can improve the dechlorination efficiency, enhance the activity of interfacial water and shorten thetreatment time.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and recovery in metallurgy, and in particular relates to a method for dechlorination and decarburization of titanium extraction tailings with synergistic multiphase reactions. Background technique [0002] Most of the titanium resources are symbiotic rock ore with complex composition, TiO 2 Low content of calcium and magnesium impurities, high content of calcium and magnesium impurities, it is difficult to meet the requirements of the production process of titanium dioxide chloride, and the process of "low temperature boiling chlorination to extract titanium" with a boiling chlorination temperature lower than the melting point of calcium and magnesium chloride has become impossible or cannot be fully removed. The outlet for the utilization of titanium resources with calcium and magnesium impurities. However, a problem that cannot be ignored is that a large amount of titanium extract...

Claims

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Application Information

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IPC IPC(8): C01F11/16C01B7/03B01J8/24B01J8/18
CPCB01J8/1809B01J8/1836B01J8/24B01J2208/00504C01B7/035C01F11/16Y02P20/129
Inventor 温良英赵岩陈杨鑫杨帆杨欢蒋汶桓曹娇鲁峰韩旭石胜云
Owner CHONGQING UNIV
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