Method for treating rutile titanium dioxide waste water

A technology for rutile titanium dioxide and waste water, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of no economic benefit, large energy consumption, and affecting absorption effect, etc. , achieve significant economic and environmental benefits, and improve recycling efficiency

Active Publication Date: 2014-10-22
SICHUAN LOMON TITANIUM IND CO LTD
9 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] For waste sulfuric acid with a concentration of 20%-30%, it can be concentrated and recycled, and for low-concentration acidic wastewater, which contains a large amount of iron ions, most sulfuric acid titanium dioxide processes cannot be used
If it is concentrated, it will consume a lot of energy and has no economic benefits
Chinese patent CN1220970 uses the acid wastewater to react with magnesium oxide to produce magnesium sulfate, which solves envi...
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Abstract

The invention discloses a method for treating rutile titanium dioxide waste water. The method comprises the following three steps of: (1) mixing acid waste water and alkaline waste water, stirring, then naturally depositing to obtain a supernatant and bottom deposits, and controlling mixing temperature to 50-60 DEG C, wherein the pH value of a solution is 7-8 after mixing; (2) adding polyacrylamide to the supernatant obtained in the step (1) according to the concentration ratio of 5-10ppm, stirring, and depositing; (3) carrying out aeration, filter pressing and drying on the lower deposits obtained in the step (1) to obtain iron oxide black, wherein filter liquor obtained through the filter pressing can be directly discharged. The method disclosed by the invention can be used for recovering insoluble titanium from the rutile titanium dioxide waste water as much as possible and reducing the discharge amount of the rutile titanium dioxide waste water, thereby recycling the water resources and further creating great economic benefit and environmental protection benefit to enterprises.

Application Domain

Ferroso-ferric oxidesMultistage water/sewage treatment

Technology Topic

Environmental chemistryPolyacrylamide +6

Examples

  • Experimental program(3)

Example Embodiment

[0023] Example 1:
[0024] 10m 3 Transfer acidic wastewater into the mixing tank, turn on the stirring, and slowly add 6m 3 -7m 3 For alkaline wastewater, control the mixing temperature at 50-60℃, stop stirring after 10-15min, the pH of the mixed liquid is between 7-8, after 60min of natural settlement, the supernatant liquid is transferred to the thickener, and the polypropylene with a concentration of 200ppm The amide was added to it at a concentration ratio of 5ppm, mixed and stirred for 30 minutes, settled for 60 minutes, and the lower layer precipitate (mainly containing TiO 2 155kg), the precipitate is returned to the alkali solution storage tank in the preparation process of calcined seed crystals to continue pressure filtration. The upper neutral water contains sulfate ions and sodium ions, which are adsorbed by activated carbon to remove ions and used for titanium dioxide production.
[0025] The lower sediment mixed with acidic wastewater and alkaline wastewater is transferred to the aeration tank and fed with compressed air. Fe(OH) is obtained after aeration for 50 minutes 2 And Fe(OH) 3 After the mixture is filtered by a membrane filter press, the filtrate is returned to the aeration tank, and the filter cake is dried and dehydrated in a hot air oven at 120°C, and then pulverized by a ball mill to obtain 48Kg of iron oxide black product.

Example Embodiment

[0026] Example 2:
[0027] Will be 20m 3 Transfer acidic wastewater into the mixing tank, turn on the stirring, and slowly add 11m 3 -14m 3 For alkaline wastewater, control the mixing temperature at 50-60℃, stop stirring after 10-15min, the pH of the mixed liquid is between 7-8, after 60min of natural settlement, the supernatant liquid is transferred to the thickener, and the polypropylene with a concentration of 200ppm The amide was added to it at a concentration ratio of 10 ppm, mixed and stirred for 30 minutes, settled for 60 minutes, and the lower layer precipitate (mainly containing TiO 2 286kg), the precipitate is returned to the alkali solution storage tank in the preparation process of calcined seed crystals to continue pressure filtration. The upper neutral water contains sulfate ions and sodium ions, which are adsorbed and removed by activated carbon and used for titanium dioxide production.
[0028] The lower sediment mixed with acidic wastewater and alkaline wastewater is transferred to the aeration tank and fed with compressed air. Fe(OH) is obtained after aeration for 50 minutes 2 And Fe(OH) 3 After the mixture is filtered by a membrane filter press, the filtrate is returned to the aeration tank, the filter cake is dried and dehydrated in a hot air oven at 120°C, and then pulverized by a ball mill to obtain 85Kg of iron oxide black product.

Example Embodiment

[0029] Example 3:
[0030] 25m 3 Transfer acidic wastewater into the mixing tank, turn on the stirring, and slowly add 15m 3 -17m 3 For alkaline wastewater, control the mixing temperature at 50-60℃, stop stirring after 10-15min, the pH of the mixed liquid is between 7-8, after 60min of natural settlement, the supernatant liquid is transferred to the thickener, and the polypropylene with a concentration of 200ppm The amide was added to it at a concentration ratio of 8ppm, mixed and stirred for 30 minutes, and settled for 60 minutes to obtain the lower layer precipitation (mainly containing TiO 2 341kg), the precipitate is returned to the alkali solution storage tank in the preparation process of calcined seed crystals to continue pressure filtration. The upper neutral water contains sulfate ions and sodium ions, which are adsorbed and removed by activated carbon for use in titanium dioxide production.
[0031] The lower sediment mixed with acidic wastewater and alkaline wastewater is transferred to the aeration tank and fed with compressed air. Fe(OH) is obtained after aeration for 50 minutes 2 And Fe(OH) 3 After the mixture is filtered by a membrane filter press, the filtrate returns to the aeration tank, the filter cake is dried and dehydrated in a hot air oven at 120°C, and then pulverized by a ball mill to obtain 105Kg of iron oxide black product.
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Description & Claims & Application Information

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