Method for pre-treating phosphorite by using acidic waste water in the production process of titanium pigment

A technology for acidic wastewater and production process, applied in phosphoric acid, phosphorus oxyacid and other directions, can solve the problems of no economic benefit, large energy consumption, reduced magnesium removal rate, etc., to reduce the cost of wastewater treatment, reduce sulfuric acid consumption, high economic sexual effect

Active Publication Date: 2010-06-30
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For acidic wastewater, due to the low concentration of sulfuric acid in acidic wastewater (concentration 3% to 5%, 4% on average) and more impurities, most of the production processes that require sulfuric acid cannot be directly used, and if sulfuric acid is recovered by concentration, it will be Consumes a lot of energy and has no economic benefit
Chinese patent CN1220970 discloses a process route for producing magnesium sulfate by reacting the acidic waste water with magnesium oxide, etc., which not only solves the environmental protection problem, but also realizes economic benefits. However, the production of magnesium sulfate is a small industry and cannot balance the production of titanium dioxide at al

Method used

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  • Method for pre-treating phosphorite by using acidic waste water in the production process of titanium pigment
  • Method for pre-treating phosphorite by using acidic waste water in the production process of titanium pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1000 kg of phosphate rock with a solid content of 75% (P 2 o 5 content of 26%, magnesium content of 2.4%, mineral powder 100 mesh sieve remaining 15%) ore pulp and acidic wastewater (sulfuric acid concentration of 3%, temperature of 45 ° C, titanium content of 0.15%, iron content of 0.26%) 3000 liters Input 10 cubic meters of pretreatment reaction tank through the pipeline, make the phosphate rock and acid wastewater react under stirring, the stirring speed is 100rpm, the initial pH value of the reaction mixture is controlled to be 2, the initial reaction temperature is 40°C, and after 2 hours of reaction The final pH was 2.8 and the temperature was 37°C. The reaction slurry out of the reaction tank is separated from solid and liquid by pressure filtration, and the P in the filter cake base 2 o 5 The content is 27.1%, the magnesium content is 0.65%, the titanium content is 0.09%, and the iron content is 0.07%. The sulfuric acid content in the filtrate is 0.4%, the m...

Embodiment 2

[0031] The ore pulp and the acid waste water in the embodiment 1 are input into the continuous reaction tank of 10 cubic meters through the pipeline with 10 liters / minute and 30 liters / minute feeding rate respectively, keep the liquid level in the reaction tank stable with the output of 40 liters / minute , the stirring speed is 100rpm, the pH value of the feed port of the reaction tank is stable in the range of 2-2.2, the temperature is at 41°C, the pH value of the discharge port of the reaction tank is stable in the range of 2.7-3.0, and the temperature is maintained at 36-37°C. Filter cake base P after discharge pressure filtration 2 o 5 The content is 27.5%, the magnesium content is 0.58%, the titanium content is 0.09%, and the iron content is 0.08%. The acid content in the filtrate was 0.39%, the magnesium content was 0.43%, the titanium content was 0.14%, the iron content was 0.23%, and the phosphorus content was 75ppm.

[0032] In this embodiment, the magnesium removal ...

Embodiment 3

[0034] The water content of the filter cake after press filtration in Example 1 is 20%, and after washing with 150 liters of circulating water, the filter cake base P 2 o 5 The content is 27.2%, the magnesium content is 0.42%, the titanium content is 0.08%, and the iron content is 0.03%. The magnesium content in the washing liquid is 0.21%, the titanium content is 0.1%, the iron content is 0.22%, and the phosphorus content is 12ppm.

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Abstract

The invention discloses a method for pre-treating phosphorite of wet process phosphoric acid by using acidic waste water in the production process of titanium pigment, which comprises the following steps: (1), collecting the acidic waste water into an acidic waste water storage groove, controlling the acid degree to be 2 to 5 percent and the total iron concentration to be 0.3 to 0.5 percent; (2), adding the acidic waste water and the milled phosphorite in a solid-to-liquid ratio of 2-5:1 into a reaction groove for reaction; and (3), performing solid-liquid separation on the slurry which is obtained in the step (2) to obtain a solid phase, namely the required phosphorite. The content of magnesium in the phosphorite which is treated by the method is reduced by over 70 percent, the loss ratio of the phosphorus is controlled to be within 1 percent; when the phosphorite which is treated by the process is used for producing the phosphoric acid by a wet method, the consumption of the sulfuric acid for mine per ton is reduced by about 10 percent; and the acidic waste water pretreats phosphorite and then is delivered to a sewage station for treatment, the consumption of lime or other alkaline substance is reduced by 60 percent compared with the mode of directly delivering the waste water to the sewage station, so the economical efficiency of the process is high.

Description

technical field [0001] The invention discloses a method for pretreating phosphate rock of wet-process phosphoric acid by using acid waste water in the production process of sulfuric acid titanium dioxide, relates to the integrated technology of waste water treatment in titanium chemical industry and phosphate rock purification in phosphorus chemical industry, and belongs to titanium chemical industry The technical field of comprehensive utilization of waste by-cycle in the phosphorus chemical industry. Background technique [0002] Most of the titanium dioxide enterprises in my country use the sulfuric acid method as the production method. In the sulfuric acid method titanium dioxide production process, the intermediate titanyl sulfate needs to be hydrolyzed into metatitanic acid and sulfuric acid. Every ton of titanium dioxide produced will produce 5-6 tons of 20 %-30% concentration of waste sulfuric acid, and in the subsequent metatitanic acid washing process, about 16-25 t...

Claims

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Application Information

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IPC IPC(8): C01B25/22
Inventor 周晓葵李曹文军李伟何刚曾志伟
Owner SICHUAN LOMON TITANIUM IND CO LTD
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