Continuous acidolysis method for preparing titanium white with sulfuric acid process

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...

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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