Method for pre-treating phosphorus rock by titanium dioxide waste acid

A titanium white waste acid and pretreatment technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the negative impact of wet-process phosphoric acid production, low magnesium removal rate, and phosphate rock removal rate cannot meet expectations Targets and other issues, to achieve the effect of repeated use of water resources, high magnesium removal rate, and reduced consumption of sulfuric acid

Active Publication Date: 2013-09-25
SICHUAN LOMON TITANIUM IND CO LTD
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Problems solved by technology

When the production scale of wet-process phosphoric acid is large and the amount of acidic wastewater is not enough to meet the pretreatment requirements of phosphate rock, the magnesium content in the treated phosphate rock is high, the magnesium removal rate is low, and the magnesium removal rate of phosphorus rock cannot reach Expected target, negative impact on wet process phosphoric acid production

Method used

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  • Method for pre-treating phosphorus rock by titanium dioxide waste acid
  • Method for pre-treating phosphorus rock by titanium dioxide waste acid
  • Method for pre-treating phosphorus rock by titanium dioxide waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1373.69Kg of acid waste water and 343.42Kg of titanium white waste acid (the mass percentage of sulfuric acid is 20%, the mass percentage of ferrous sulfate is 10%) is quickly mixed with 1000kg of phosphate rock with a solid content of 75% through a tube mixer (P 2 o 5 content of 28.73%, MgO content of 2.50%, mineral powder 100 mesh sieve remaining 10%) ore slurry, respectively input 5m through the pipeline 3 Pretreat the reaction tank, make the phosphate rock and titanium white waste acid react under stirring, the stirring intensity is 100rpm, the pH value of the reaction slurry is controlled at 2, the temperature is 41°C, and the residence time of the material in the pretreatment tank is 2h. The slurry out of the pretreatment tank is separated and washed through a filter press, and the P in the filter cake base is 2 o 5 The content is 29.28%, and the MgO content is 0.15%. The sulfuric acid content in the filtrate is 0.16%, the MgO content is 0.50%, and the P conte...

Embodiment 2

[0035] 2048.68 Kg of external drainage and 279.37Kg of titanium white waste acid (30% by mass of sulfuric acid, 14% by mass of ferrous sulfate) are quickly mixed with 1000kg of phosphate rock with a solid content of 75% by a tube mixer (P 2 o 5 content of 28.73%, MgO content of 2.50%, mineral powder 100 mesh sieve remaining 10%) ore slurry, respectively input 5m through the pipeline 3 Pretreat the reaction tank to make the phosphate rock and titanium white waste acid react under stirring, the stirring intensity is 100rpm, the pH value of the reaction slurry is controlled to 4, the temperature is 40°C, and the residence time of the material in the pretreatment tank is 1.8h. The slurry out of the pretreatment tank is separated and washed through a filter press, and the P in the filter cake base is 2 o 5 The content is 29.22%, and the MgO content is 0.45%. The sulfuric acid content in the filtrate is 0.06%, the MgO content is 0.50%, and the P content is 0.8ppm.

[0036] In t...

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Abstract

The invention discloses a method for pre-treating phosphorus rock by titanium dioxide waste acid, comprising the following steps of: (1) collecting titanium dioxide waste acid to a waste acid storage tank, and controlling concentration of sulfuric acid in the titanium dioxide waste acid to be 20-30%, and concentration of ferrous sulfate to be 10-14%; (2) mixing and diluting the dilution water and the titanium dioxide waste acid according to the mass ratio of (4-10):1, and controlling content of the sulfuric acid to be 1-8%; and (3) adding diluted titanium dioxide waste acid and ground phosphorus rock to a reaction tank to react so as to obtain reaction slurry, and separating solid and liquid of the reaction slurry to obtain a solid phase, i.e.,, pre-treated phosphorus rock. The method not only has high magnesium removing rate and low phosphorus loss rate, but also solves the problem that the fluctuation of the acid concentration influences a pre-treatment pH (Potential Of Hydrogen) value, is suitable for wet-process phosphoric acid production of different scales, has high production efficiency and low operation cost, and is economic and practical.

Description

technical field [0001] The invention discloses a method for pretreating phosphate rock of wet-process phosphoric acid by using titanium dioxide waste acid in the sulfuric acid process titanium dioxide production process, and relates to the integrated technology of waste acid treatment in titanium chemical industry and phosphate rock purification in phosphorus chemical industry. It belongs to the technical field of recycling and comprehensive utilization of by-product waste in titanium chemical industry and phosphorus chemical industry. Background technique [0002] Most of the production methods of titanium dioxide enterprises in my country are the sulfuric acid method, which is the acid hydrolysis reaction of ferrotitanium powder and concentrated sulfuric acid to generate intermediate titanyl sulfate, which needs to be hydrolyzed into metatitanic acid and sulfuric acid, and metatitanic acid is then Titanium dioxide products are obtained by washing, calcining, crushing and ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/222
CPCC01B25/222
Inventor 文军蔡平雄曾小林朱全芳李伟向书刚
Owner SICHUAN LOMON TITANIUM IND CO LTD
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