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A method for recovering hydrochloric acid by using steam to neutrally hydrolyze titanium tetrachloride dust collection slag

A technology for titanium tetrachloride and recovery of hydrochloric acid, which is applied in the direction of chloride preparation, chemical instruments and methods, chlorine/hydrogen chloride, etc., can solve problems such as equipment corrosion, high processing cost, and complicated process flow, and achieve low cost and total cost. The effect of reduced emissions and simple anti-corrosion measures for equipment

Active Publication Date: 2018-12-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to solve the problems in the existing technology of titanium tetrachloride dust collection and slag recycling technology that the process flow is complicated, the huge hydrochloric acid solution corrodes the equipment seriously, and the processing cost is high, the present invention provides a method for neutrally hydrolyzing titanium tetrachloride by steam A method for recovering hydrochloric acid from dust slag, the method has short process flow, energy saving and environmental protection, easy operation, low cost, high processing efficiency, and high comprehensive utilization rate of materials

Method used

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  • A method for recovering hydrochloric acid by using steam to neutrally hydrolyze titanium tetrachloride dust collection slag
  • A method for recovering hydrochloric acid by using steam to neutrally hydrolyze titanium tetrachloride dust collection slag

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Embodiment 1

[0055] Embodiment 1: a kind of method utilizing steam neutral hydrolysis titanium tetrachloride dust collecting slag to reclaim hydrochloric acid, concrete steps comprise:

[0056] Such as figure 1 As shown, the rotary kiln is provided with a recombustion chamber 5 at the kiln head end, and the tail gas and water vapor of the boiling chlorination furnace are fully mixed and heated in the reburning chamber 5, and combustible gases such as CO in the tail gas of the boiling chlorination furnace are Combustion is achieved in the recombustion chamber 5; a gas condenser 1 is arranged at the kiln end of the rotary kiln to cool the HCl gas and recover hydrochloric acid.

[0057] The characteristics of the rotary kiln for steam neutral hydrolysis of titanium tetrachloride dust collection slag: the first is that the titanium tetrachloride dust collection slag forms countercurrent contact with the hydrolysis gas phase, that is, the titanium tetrachloride dust collection slag is added to ...

Embodiment 2

[0062] Embodiment 2: a kind of method that utilizes steam neutral hydrolysis titanium tetrachloride dust collecting slag to reclaim hydrochloric acid, concrete steps comprise:

[0063] The titanium tetrachloride dust slag from the dust collector is crushed to a particle size of not more than 0.109mm, and the mass percentage of the titanium tetrachloride dust slag is TiO 2 6.50%, C 24.01%, Cl – 32.40%, Fe 13.42%, Mn 3.86%, Al3.04%, SiO 2 9.02%, (CaO+MgO) 6.76%, the titanium tetrachloride dust slag after the crushing is added in the rotary kiln body 3 with the flow rate of 100kg / h per cubic meter at a constant speed from the solid phase inlet 2 at the rear of the rotary kiln; Water vapor at 200 m 3 The flow rate of / h is introduced into the recombustion chamber 5 at the kiln head end through the water vapor inlet 6, and the volume fraction of the tail gas of the boiling chlorination furnace (the composition of the tail gas of the boiling chlorination furnace is: CO 2 42....

Embodiment 3

[0067] Embodiment 3: a kind of method utilizing steam neutral hydrolysis titanium tetrachloride dust collecting slag to reclaim hydrochloric acid, concrete steps comprise:

[0068] Grind the titanium tetrachloride dust collection slag from the dust collector until the particle size is not greater than 0.096mm, and the mass percentage of the titanium tetrachloride dust collection residue is TiO 2 6.50%, C 41.34%, Cl – 30.14%, Fe 6.42%, Mn 2.22%, Al 2.44%, SiO 2 4.02%, (CaO+MgO) 5.71%, the titanium tetrachloride dust slag after the crushing is added in the rotary kiln body 3 with the flow rate of 120kg / h per cubic meter at a constant speed from the solid phase inlet 2 at the rear of the rotary kiln; Water vapor at 300 m 3 The flow rate of / h is introduced into the recombustion chamber 5 of kiln head end by water vapor inlet 6, will boil off chlorination furnace tail gas (the volume fraction of the composition of boiling chlorination furnace tail gas is: CO 2 44.00%, CO 4...

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Abstract

The invention discloses a method for recycling hydrochloric acid through vapor neutral hydrolysis of titanium tetrachloride dust collection residues, and belongs to the fields of waste residue comprehensive utilization and non-ferrous metal metallurgy. The dust collection residues are added to a rotary kiln at a constant speed, mixed gas of boling chloridizing furnace tail gas and water vapor are continuously introduced into the rotary kiln, the soil phase and the gas phase in the rotary kiln are in countercurrent contact, acid chlorides and neutral chlorides in the titanium tetrachloride dust collection residues are hydrolyzed in the vapor to generate HCl, and gas forms hydrochloric acid through a gas condenser. Iron of a hydrolyzed solid product is recycled through low intensity magnetic separation and petroleum coke is recycled through select flotation. According to the method, more than 80% of chlorine in the titanium tetrachloride dust collection residues is converted into hydrochloric acid, and more than 90% of the iron and more than 80% of the petroleum coke can be recycled. The anti-corrosion measurement of a device is simple and cost is low.

Description

technical field [0001] The invention relates to a method for recovering hydrochloric acid by using steam to neutrally hydrolyze titanium tetrachloride dust-collecting slag, in particular to recovering hydrochloric acid, petroleum coke and unreacted titanium raw materials from titanium tetrachloride dust-collecting slag, belonging to the field of comprehensive utilization of waste residue and non-ferrous metal production. technical background [0002] Chlorination method to produce crude titanium tetrachloride is mainly through high titanium slag, petroleum coke, sodium chloride solid material mixed according to a certain proportion and sent to the middle of the chlorination furnace, liquid chlorine is sent from the bottom of the chlorination furnace after gasification, solid The mixture and gaseous chlorine react chemically inside the chlorination furnace to generate gaseous crude titanium tetrachloride. A certain amount of solid dust particles follow the crude titanium tet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/03C01G49/08B03D1/00
CPCB03D1/00C01B7/035C01G49/08
Inventor 朱云李宁魏佩杰陈顺智
Owner KUNMING UNIV OF SCI & TECH