Method for removing iron from titanium dioxide concentrated acid solution

A technology for concentrating acid and titanium dioxide, which is applied in the direction of iron sulfate, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of unfavorable production of high-quality ammonium phosphate products, failure to increase the water solubility of ammonium phosphate, and failure to reduce iron content, etc. Achieve the effects of small investment, low production cost, and reduced iron content

Active Publication Date: 2014-11-05
XIANGYANG LOMON TITANIUM IND CO LTD +1
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Problems solved by technology

Adding an oxidant only oxidizes ferrous iron into ferric iron, which improves the hue of ammonium phosphate, fails to reduce the content of iron, and cannot increase the water solubility of ammonium phosphate, which is not conducive to the production of high-quality ammonium phosphate products
Therefore, the use of titanium dioxide concentrated acid in the production of wet-process phosphoric acid is subject to certain restrictions

Method used

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  • Method for removing iron from titanium dioxide concentrated acid solution
  • Method for removing iron from titanium dioxide concentrated acid solution

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Put 1000kg of concentrated titanium dioxide acid (54% by mass of sulfuric acid, 0.48% by mass of ferrous iron, and a temperature of 55°C) and 5.6kg of industrial hydrogen peroxide (27.5% by mass of hydrogen peroxide) through the pipeline Enter 1m 3 Add 3kg of ferric sulfate as a seed crystal in the reaction tank, oxidize and crystallize under stirring conditions, the stirring speed is 100rpm, and the crystallization time is 3h. After the crystallized slurry is filtered by a filter press, the filtrate is sent to wet-process phosphoric acid use.

[0022] In the present embodiment, the concentrated acid iron content is reduced to 0.15%, and the iron removal rate is 69%.

Embodiment 2

[0024] Pass 1000kg of concentrated titanium dioxide acid (48% by mass of sulfuric acid, 0.55% by mass of ferrous iron, and 55°C) and 6.5kg of industrial hydrogen peroxide (27.5% by mass of hydrogen peroxide) through the pipeline Enter 1m 3 Add 3kg of ferric sulfate as a seed crystal in the reaction tank, oxidize and crystallize under stirring conditions, the stirring speed is 100rpm, and the crystallization time is 2.5h. After the crystallized slurry is filtered by a filter press, the filtrate is sent to the wet process phosphoric acid used.

[0025] In the present embodiment, the concentrated acid iron content is reduced to 0.19%, and the iron removal rate is 65%.

Embodiment 3

[0027] Put 1000kg of concentrated titanium dioxide acid (54% by mass of sulfuric acid, 0.48% by mass of ferrous iron, and a temperature of 55°C) and 5.6kg of industrial hydrogen peroxide (27.5% by mass of hydrogen peroxide) through the pipeline Enter 1m 3 Add 5kg of ferric sulfate as a seed crystal in the reaction tank, oxidize and crystallize under stirring conditions, the stirring speed is 100rpm, and the crystallization time is 3h. For 0.5h, the supernatant is sent to wet-process phosphoric acid for use, the lower layer of thick slurry is filtered with a small filter press, and the filtrate is sent to wet-process phosphoric acid.

[0028] In this implementation case, the content of concentrated acid iron is reduced to 0.14%, and the iron removal rate is 70%.

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Abstract

A disclosed method for removing iron from a titanium dioxide concentrated acid solution comprises the following steps: (1) collecting the titanium dioxide concentrated sulfuric acid solution with the mass percentage of 45%-55% into a reaction tank; (2) adding an oxidant and a crystal seed into the reaction tank and performing oxidation, crystallization and curing; and (3) performing solid-liquid separation on the slurry obtained in the step (2), and using the separated liquid phase for wet-process phosphoric acid production. The method has the iron-removing rate of 65% or more, helps to effectively reduce the iron content of the titanium dioxide concentrated acid solution and improve the product quality of a phosphate salt, further optimizes sulfur-phosphor-titanium industrial chain and greatly reduces the production cost of phosphorus chemical industry and titanium chemical industry, and is substantial in economic benefit. The method has no waste and byproduct discharge in the whole process, is extremely small in investment, extremely low in production cost and simple in operation, has important meaning on resource recycling and green production, and has wide popularization application prospect.

Description

technical field [0001] The invention relates to a method for recycling concentrated titanium dioxide acid, in particular to a method for purifying and removing iron from titanium dioxide concentrated acid. Background technique [0002] The production methods of titanium dioxide mainly include chloride method and sulfuric acid method. The sulfuric acid method is to use sulfuric acid to carry out acid hydrolysis treatment on titanium concentrate or acid-soluble titanium slag, and the obtained titanyl sulfate solution is hydrolyzed to obtain metatitanic acid precipitation; Both anatase and rutile products can be produced. The sulfuric acid method has the advantages of low production cost and mature technology, and is a method commonly used in the existing titanium dioxide production methods. However, every 1 ton of titanium dioxide produced by the sulfuric acid method needs to consume more than 4 tons of sulfuric acid, and at the same time produce 6~8 tons of waste acid w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C01B25/18
Inventor 陈玲陈葵周晓葵孙润发朱家文文军
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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