Method for converting titanium dioxide red gypsum into white gypsum and enriching titanium and iron

A white gypsum and red gypsum technology, applied in chemical instruments and methods, titanium and titanyl sulfate, ferric sulfate, etc., can solve the problems of inability to use building materials product development, low wastewater treatment efficiency, etc., and achieve considerable economic benefits, The effect of stable treatment effect and low equipment investment

Active Publication Date: 2018-07-10
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The scheme adopts three-stage neutralization treatment, and the TiOSO that can be prepared 4 In acid solution, the F value is as high as 8-10, so the recovery rate of titanium is limited to 80%; the output of white gypsum and red gypsum, due to the existence of red gypsum, the white gypsum can only be mixed with red gypsum and dried

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  • Method for converting titanium dioxide red gypsum into white gypsum and enriching titanium and iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for converting titanium white red gypsum into white gypsum and enriching titanium and iron, comprising the following steps:

[0027] (1) Preparation of white gypsum: While blowing air, turn on the mechanical agitation, pump the titanium dioxide wastewater into the reaction tank, add calcium carbonate stone slurry at the same time, adjust to pH=1.52, stop stirring, and pass the solid-liquid mixture through the diaphragm filter press Separation, that is, white gypsum and a filtrate, titanium dioxide wastewater index: H 2 SO 4 =70.32g / l, TiOSO 4 =2.32g / l, FeSO 4 =40.05g / l; One-stage filtrate indicator: H 2 SO 4 = 18.06g / l, TiOSO 4 =2.14g / l, FeSO 4 = 36.64g / l; white gypsum index: moisture = 24.80%, SO 3 =43.92%, pH=6.52.

[0028] (2) Preparation of red gypsum: After a section of filtrate is pumped into the reaction tank, while blowing air, turn on the mechanical agitation, first add calcium carbonate stone powder slurry, adjust to pH=4.7, then add milk of l...

Embodiment 2

[0032] A method for converting titanium white red gypsum into white gypsum and enriching titanium and iron, comprising the following steps:

[0033] (1) Preparation of white gypsum: While blowing air, turn on the mechanical agitation, pump the titanium dioxide wastewater into the reaction tank, add calcium carbonate stone slurry at the same time, adjust to pH=1.55, stop stirring, and pass the solid-liquid mixture through the diaphragm filter press. Separate to obtain white gypsum and a section of filtrate. Titanium dioxide wastewater index: H 2 SO 4 = 69.12g / l, TiOSO 4 =2.95g / l, FeSO 4 =39.10g / l; One-stage filtrate indicator: H 2 SO 4 = 17.78g / l, TiOSO 4 =2.81g / l, FeSO 4 =36.13g / l; white gypsum index: moisture = 25.40%, SO 3 =43.73%, pH=6.46.

[0034] (2) Preparation of red gypsum: After a section of filtrate is pumped into the reaction tank, while blowing air, start the mechanical agitation, first add calcium carbonate stone powder slurry, adjust to pH=4.8, then add ...

Embodiment 3

[0038] A method for converting titanium white red gypsum into white gypsum and enriching titanium and iron, comprising the following steps:

[0039] (1) Preparation of white gypsum: While blowing air, turn on the mechanical agitation, pump the titanium dioxide wastewater into the reaction tank, add calcium carbonate stone slurry at the same time, adjust to pH=1.57, stop stirring, and pass the solid-liquid mixture through the diaphragm filter press. Separate to obtain white gypsum and a section of filtrate. Titanium dioxide wastewater index: H 2 SO 4 = 64.37g / l; TiOSO 4 = 2.63g / l; FeSO 4 =35.29g / l; One-stage filtrate indicator: H 2 SO 4 = 16.63 g / l, TiOSO 4 =2.52g / l, FeSO 4 = 33.18g / l; white gypsum index: moisture = 25.34%, SO 3 =44.28%, pH=6.43.

[0040] (2) Preparation of red gypsum: After a section of filtrate is pumped into the reaction tank, while blowing air, start the mechanical agitation, first add calcium carbonate stone powder slurry, adjust to pH=4.6, then a...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for converting titanium dioxide red gypsum into white gypsum and enriching titanium and iron.The method comprises the following steps: preparing white gypsum, preparing the red gypsum, converting the red gypsum into acid white gypsum, and converting the acid white gypsum into the white gypsum; through control of a process and an end point of the reaction, the produced white gypsum can be directly used for a cement factory, and can be deeply processed into building material gypsum with higher added value; through dissolution of the red gypsum by a waste concentrated acid, the red gypsum is converted into the acid white gypsum, and a TiOSO4 and FeSO4 acidic solution with a high concentration is obtained, wherein the recovery utilization rate is 95% or more; and the acid white gypsum is diluted by using titanium dioxide wastewater, and after primary neutralization is performed, thewhite gypsum is obtained. The method provided by the invention has a simple technological process, a stable treatment effect, less equipment investment, no secondary pollution, low treatment costs, considerable economic benefits and broad market prospects.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for converting titanium white red gypsum into white gypsum and enriching titanium and iron. Background technique [0002] At present, most domestic titanium dioxide factories adopt the sulfuric acid method for production, and the main pollution factor of the titanium dioxide wastewater produced is H 2 SO 4 、TiOSO 4 , FeSO 4 . The wastewater treatment of most titanium dioxide factories is to prepare titanium gypsum and external drainage. Since the external drainage must meet the GB8978-1996 standard, it is necessary to treat FeSO 4 Pollution factor, only milk of lime can be used to reduce FeSO 4 Neutralization reaction produces Fe(OH) 2 and CaSO 4 2H 2 Mixed gypsum of O, due to Fe(OH) 2 Easily oxidized to red Fe(OH) in air 3 , so it is called red gypsum. Red gypsum not only moisture = 40-45% is too high, SO 3 = 27-29% is seriously low,...

Claims

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Application Information

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IPC IPC(8): C04B11/26C01G23/00C01G49/14C02F9/04
CPCC01G23/008C01G49/14C02F1/001C02F1/5236C02F1/66C02F9/00C04B11/262
Inventor 伍佳
Owner CNMC GUANGXI PGMA
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