Continuous acidolysis method for preparing titanium white with sulfuric acid process

A technology of sulfuric acid method and titanium dioxide, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve problems such as air pollution, and achieve the effect of improving quality, uniform and fine particles, and fast dissolution

Inactive Publication Date: 2012-06-20
GUANGDONG HUI YUN TITANIUM IND CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a continuous acidolysis method for producing titanium dioxide by sulfuric acid method, so as to solve the problem of air pollution caused by acidolysis reaction of titanium dioxide produced by sulfuric acid method in China, and to accurately and stably control the main reaction of acidolysis state, improve the acid hydrolysis rate and the stability of titanyl sulfate solution, eliminate the safety hazards caused by acid hydrolysis reaction, and provide a safe and reliable working environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Turn on the tail gas treatment system, and after the tail gas treatment system operates normally, mix 4.62t of concentrated sulfuric acid with a mass percentage of 98% and 3.3t of titanium ore powder in a high-efficiency mixer at a temperature lower than 35°C to obtain a mixed acid ore liquid, then 5m 3 / h flow into the reactor. Based on the maximum temperature of 140°C in the reactor, adjust the adding speed of the reaction starting water, and the speed is 0.5-2m 3 Change within / h to get solid phase with finer particles. The solid phase is added into the dissolving tank together with the dissolved water for dissolution, and the F value of the titanyl sulfate solution is ensured to be 1.75-1.85 and the stability is greater than 500ml by adjusting the flow rate of the dissolved water to obtain the titanyl sulfate solution. The titanium oxytitanium sulfate solution is conventionally hydrolyzed to obtain metatitanic acid, and then the metatitanic acid is washed and calc...

Embodiment 2

[0018] Turn on the tail gas treatment system, and after the tail gas treatment system operates normally, mix 4.62t of concentrated sulfuric acid with a mass percentage of 98% and 3.3t of titanium ore powder in a high-efficiency mixer at a temperature lower than 35°C to obtain an acid ore mixture , and at 5m 3 / h flow into the reactor. Adjust the adding speed of the reaction starting water based on the maximum temperature of 150°C in the reactor, and the adding speed of the starting water is generally 0.5-2m 3 Change within / h to get solid phase with finer particles. Add the solid phase and dissolved water (used acid) into the dissolution tank for dissolution, and ensure that the F value of the titanyl sulfate solution is 1.75 to 1.85 and the stability > 500ml by adjusting the flow rate of the dissolved water to obtain sulfuric acid Titanium liquid. The titanium oxytitanium sulfate solution is conventionally hydrolyzed to obtain metatitanic acid, and then the metatitanic aci...

Embodiment 3

[0021] Turn on the tail gas treatment system, and after the tail gas treatment system operates normally, mix 4.62t of concentrated sulfuric acid with a mass percentage of 98% and 3.3t of titanium ore powder in a high-efficiency mixer at a temperature lower than 35°C to obtain a mixed acid ore liquid, then 5m 3 / h flow into the reactor. Adjust the adding speed of the reaction starting water based on the maximum temperature of 160°C in the reactor, and the adding speed of the starting water is generally 0.5-2m 3 Change within / h to get solid phase with finer particles. Add the solid phase and dissolved water (used acid) into the dissolution tank for dissolution, and ensure that the F value of the titanyl sulfate solution is 1.75 to 1.85 and the stability > 500ml by adjusting the flow rate of the dissolved water to obtain sulfuric acid Titanium liquid. The titanium oxytitanium sulfate solution is conventionally hydrolyzed to obtain metatitanic acid, and then the metatitanic ac...

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PUM

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Abstract

The invention discloses a continuous acidolysis method for preparing titanium white with a sulfuric acid process. The method comprises the following steps of: starting a tail gas treating system, and uniformly mixing concentrated sulfuric acid with titanium ore powder in the mass ratio of (1.3-1.7):1 between pure sulfuric acid in the concentrated sulfuric acid and the titanium ore powder at the mixing temperature of lower than 35 DEG C to obtain an acid ore mixed solution; injecting the acid ore mixed solution and reaction starting water into a reaction container, controlling the injection speed of the acid ore mixed solution at 3-6 m<3>/h, and adjusting the injection speed of the reaction starting water at the temperature of 140-170 DEG C in a reactor to obtain a particulate solid phase substance; and adding the particulate solid phase substance and water or waste acid into a dissolving tank for dissolving, and ensuring that the F value of a titanium oxysulfate titanium solution is 1.75-1.85 and the titanium solution stability is over 500ml by adjusting the flow of dissolved water to obtain a titanium oxysulfate titanium solution. By controlling the mixture ratio of the concentrated sulfuric acid and the titanium ore powder in an acidolysis main reaction and the state and the temperature of the main reaction, a reaction process is very stable, the acidolysis quality is enhanced, solid-phase substance particles obtained after acidolysis are uniform and fine, and dissolving is quicker and more complete, so that the yield and output of acidolysis are increased.

Description

Technical field: [0001] The invention relates to the preparation of titanium white by the sulfuric acid method, in particular to a continuous acid hydrolysis method for the preparation of titanium white by the sulfuric acid method. Background technique: [0002] According to the concentration of sulfuric acid involved in the reaction and the state of the final reaction product, acidolysis is divided into three types: liquid-phase method, solid-phase method and two-phase method. At present, the solid-phase method is commonly used in China. The sulfuric acid with a concentration greater than 80% and titanium ore powder react rapidly and violently in the acidolysis pot to form a solid-phase substance, and then add water to obtain the titanyl sulfate solution. intermittently. However, the main reaction of the solid-phase method is too violent, and a large amount of SO is released instantaneously. 3 , SO 2 The gas may even leak out of the pot, which is difficult to control, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 何明川赵平
Owner GUANGDONG HUI YUN TITANIUM IND CORP LTD
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