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Method for pre-treating phosphorus rock by mixture of titanium dioxide waste acid and fluorine-containing waste water

A titanium dioxide waste acid and pretreatment technology, applied in chemical instruments and methods, phosphorus compounds, phosphoric acid, etc., can solve the problems of low phosphorus loss rate, high production efficiency, low operating cost, etc., and achieve low phosphorus loss and magnesium content. The effect of reducing and high demagnesization rate

Active Publication Date: 2014-07-09
SICHUAN LOMON TITANIUM IND CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to address the deficiencies in the prior art, to provide a method for pretreatment of phosphate rock by using the waste titanium dioxide acid produced in the sulfuric acid process titanium dioxide production process and the fluorine-containing waste water in the wet process phosphoric acid. The treatment method solves the post-treatment problem of titanium dioxide waste acid and fluorine-containing wastewater under the condition of high magnesium removal rate and low phosphorus loss rate, reduces the treatment cost of titanium dioxide waste acid and fluorine-containing wastewater, and also solves the problem of The impact of acid concentration fluctuations on the pretreatment PH value of acid wastewater in the process of pretreatment of phosphate rock, it is suitable for different scales of wet phosphoric acid production, high production efficiency, low operating costs, economical and practical

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  • Method for pre-treating phosphorus rock by mixture of titanium dioxide waste acid and fluorine-containing waste water
  • Method for pre-treating phosphorus rock by mixture of titanium dioxide waste acid and fluorine-containing waste water
  • Method for pre-treating phosphorus rock by mixture of titanium dioxide waste acid and fluorine-containing waste water

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Embodiment 1

[0032] 899.59Kg of fluorine-containing waste water (fluorine content 3.3g / l) and 249.89Kg of titanium dioxide waste acid (20% sulfuric acid concentration, 10% ferrous sulfate content) are quickly mixed with 1000kg of solid content 65% through a tubular mixer Phosphate rock (P 2 O 5 The content is 28.54%, the MgO content is 2.63%, and the ore powder 100-mesh sieve remains 11%.) The slurry is fed into 5m through the pipeline. 3 The pretreatment reaction tank makes the phosphate rock react with the waste acid of titanium dioxide under stirring, the stirring intensity is 100rpm, the pH value of the reaction slurry is controlled to be 2.5, the temperature is 44℃, and the residence time of the materials in the pretreatment tank is 2h. The slurry out of the pretreatment tank is separated and washed by the filter press to filter P in the biscuit base 2 O 5 The content is 29.08%, and the MgO content is 0.15%. The pH value of the filtrate is 3.0, the MgO content is 0.47%, the P content is...

Embodiment 2

[0035] 2024.39Kg of fluorine-containing wastewater (4.2g / l fluorine content) and 303.66Kg of waste titanium dioxide acid (30% sulfuric acid concentration and 14% ferrous sulfate content) are quickly mixed with 1000kg of solid content 65% through a tubular mixer Phosphate rock (P 2 O 5 The content is 28.54%, the MgO content is 2.63%, and the ore powder 100-mesh sieve remains 11%.) The slurry is fed into 5m through the pipeline. 3 The pretreatment reaction tank makes the phosphate rock react with the waste acid of titanium dioxide under stirring, the stirring intensity is 100rpm, the pH value of the reaction slurry is controlled to be 3.0, the temperature is 42°C, and the residence time of the materials in the pretreatment tank is 2h. The slurry out of the pretreatment tank is separated and washed by the filter press to filter P in the biscuit base 2 O 5 The content is 28.76%, and the MgO content is 0.47%. The pH value of the filtrate was 3.5, the MgO content was 0.45%, the P cont...

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Abstract

Provided is a method for pre-treating phosphorus rock by a mixture of titanium dioxide waste acid and fluorine-containing waste water. The method comprises a step of enabling an acid solution and phosphorus rock pulp having solid content being more than 75% to react in an reaction tank to obtain reaction slurry and a step of performing solid-liquid separation on the reaction slurry. The acid solution is prepared through the following steps: (1) collecting titanium dioxide waste acid, obtained in sulfate-based titanium dioxide production, to a waste acid storage tank, controlling content of sulfuric acid in the titanium dioxide waste acid to be 20-30%, and content of ferrous sulfate to be 10-14%; (2) mixing the fluorine-containing waste water and the titanium dioxide waste acid according to the mass ratio of (4-10):1 to obtain an acid solution. By means of the method, post-treatment cost of the titanium dioxide waste acid and the fluorine-containing waste water is reduced on the conditions of high magnesium removing rate and low phosphorus loss rate; meanwhile, the problem that a pre-treatment pH value is influenced by the fluctuation of the acid concentration of the acid waste water in a process of pre-treating the phosphorus rock is solved; and the method is suitable for wet-process phosphoric acid production.

Description

Technical field [0001] The invention discloses a method for pretreating the phosphate rock of wet-process phosphoric acid by using waste acid of titanium dioxide in the production process of titanium dioxide by sulfuric acid method and the by-product fluorine-containing wastewater from wet-process phosphoric acid production, and relates to waste acid treatment of titanium chemical industry , Wet-process phosphoric acid's fluorine-containing wastewater treatment and the integrated technology of phosphate ore purification in the phosphorus chemical industry belong to the technical field of secondary waste recycling comprehensive utilization of the titanium chemical industry and the phosphorus chemical industry. Background technique [0002] Most of the production methods of titanium dioxide enterprises in my country are sulfuric acid method, which is the acid hydrolysis reaction of titanium concentrate and concentrated sulfuric acid to produce intermediate titanyl sulfate, which is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/22C01G49/14
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