A acidolysis method and the final state of the reaction product of a titanium iron solution of mineral acids are sulfuric acid concentration in the liquid phase method according to participate in the reaction, three kinds of two-phase method and solid phase method.
1. The liquid phase method uses 55%-65% sulfuric acid, the acid hydrolysis reaction is carried out in the liquid phase, the reaction temperature is 130 ° C-140 ° C, and the reaction time is 12-16 h. In order to prevent early hydrolysis, the acid ratio (F) is controlled. 3-3.2, directly obtain a titanium sulfate solution.
2. The two-phase method uses 65%-80% sulfuric acid, the reaction temperature is 150-200 ° C, the reaction time is 6-8 h, the F value is controlled at 1.8-2. 2, and the mixture is heated until precipitation occurs, and the obtained product is paste. After the water is leached, a suspension solution is formed, and the reaction rate is 85% to 90%.
3. Solid phase method Using 80% or more of sulfuric acid, the reaction is rapid and rapid, and it is completed in 5-30min. The maximum temperature of the reaction is 250 °C. Since the boiling point of sulfuric acid is 338 °C, it can adapt to this requirement. The highest acid hydrolysis rate is 97%. The obtained product is a solid phase, and then the solution is immersed in a solution to obtain a F value of 1. 6-2.
Second, the advantages of solid phase acid hydrolysis
The liquid phase method and the two-phase method have a long reaction time, consume more sulfuric acid, and have a low decomposition rate of ilmenite. Compared with these two methods, the solid phase method has the following advantages:
1 consumes the least amount of sulfuric acid;
2 The reaction is the fastest, which can reduce the heating time, shorten the production cycle, improve equipment utilization and output, and save fuel;
3 the highest acid hydrolysis rate;
4 The solution F value is relatively low, which is beneficial to the post-hydrolysis;
5 equipment strength, high production capacity.
It is precisely because of the advantages of solid phase acid hydrolysis that industrial production generally uses a solid phase method.
Third, the chemical reaction of acid hydrolysis
The chemical composition of ilmenite is ferrous titanate (FeTi0 3 ), which is a weak acid weak base salt, which can react with strong acid and can be carried out more completely. The reaction of sulfuric acid to decompose ferrite is generally considered to be carried out according to the following reaction formula:
[next]
The ratio between the titanium sulfate and the titanyl sulfate formed after the acid hydrolysis is determined by the acid hydrolysis conditions. From the reaction formula (1) and the reaction formula (2), it is necessary to obtain 2 mol of sulfuric acid per 1 mol of titanium sulfate. And each generation of 1 mol of titanium oxysulfate requires only 1 mol of sulfuric acid. It can be seen that the more excess sulfuric acid is, the more favorable the reaction proceeds and the formation of titanium sulfate.
Fourth, the effective product acid in an acid leaching solution obtained titanium sulfate solution, sulfuric acid is present mainly in three forms: â‘ combined with titanium sulfate; â‘¡ with other metal (mainly iron) bound sulphate; â‘¢ unbound, Excess free acid. Since the acid and free acid bound to titanium cannot be separately measured, the sum of the two can only be determined, so the sum of the two is called an effective acid.
Effective Acid = Acid Combined with Iron + Free Acid The same titanium solution, if concentrated or diluted, its concentration changes, but its properties remain unchanged.
5. Acid ratio and its influencing factors, the ratio of the acid ratio will affect the ratio of the effective acid to the total titanium content in the titanium solution. The acid ratio is also called the acidity coefficient, which is usually expressed by F:
From the formula, three factors, such as free acid, titanium-bound acid and total TiO 2 content, affect the F value. But the F value is just an acid ratio. In many cases, it does not explain some essential problems. For example, after the titanium liquid is concentrated or diluted, its total TiO 2 concentration and effective acid concentration change, but its properties and F value remain unchanged. When the ratio of titanyl sulfate to titanium sulfate in the solution changes, the free acid also It will change with it, but its F value will not change; the determination of effective acid is not easy to be obvious because of the end point, so the F value can only be used as a production reference, and its value should be analyzed in combination with the process.
The F value can not only show the composition of titanium in the titanium liquid, but also evaluate the effect and quality of the acid, and also affect the hydrolysis rate, the hydrolysis rate and the structure of the hydrolysate metatitanic acid.
6. Titanium solution obtained by solid phase acid hydrolysis can be expressed by titanyl sulfate
[next]
Among them, there are both titanium sulfate and titanium sulfate. It is considered that, if all of the titanium sulfate, the F value should be 2.45, plus a certain amount of free acid in the molten iron, then the F value should be greater than 2.45. However, the F value of the titanium liquid obtained by solid phase leaching is generally only 1.6-2.0, and its F value is far from 2.45, and it does not exceed 2.45. Therefore, the content of titanium sulfate in the molten iron is not much, and iron When the F value of the liquid is < 2.45, the content is mainly based on titanyl sulfate. The F value of the solid phase titanium solution is only 1.6-2.0, and it can be expressed by titanyl sulfate. At 200 ° C or higher of the acid hydrolysis reaction, both the reactant water and the water produced by the reaction have evaporated, and the conditions for the formation of Ti(S0 4 ) 2 are obtained, but the acid-mine ratio is (1. 45-1. 55):1. It is not enough to change titanium into Ti(S0 4 ) 2 , so there is also TiOS0 4 in the solid phase. Ti (S0 4 ) 2 is only present in the solid phase, and once it is immersed in water, it is hydrolyzed to form TISO 4 4 , so the titanium in the titanium solution exists in the form of TISO 4 .
7. Calculation of combined acid and free acid with titanium
5%之间之间之间。 The solid phase method of the solution of the titanium solution, the F value is generally between 1.6-2. 0, the FOA value is between 30. 45% -63. 07%. When the F value differs by 0.1, the FOA value differs by 8.15%, which is expressed by the FOA value and is easier to control.
The chassis is easy to be damaged and broken, expecially for the brake shoes and brake pad. In addtional, the hydraulic pumps and power steering pump, ball joint and tie rod end. The other trackes and crawler belt all could be supplied. We integrate lots of resource for the parts used on Caterpillar machines. And over thousands of Chinese great factory cooperate with us. Our team will offer you a good solution to solve your problems. And our work time is Monday to Friday at 9:00 till 17:30, on Saturday 9:00 to 12:00. Customers can also leave messages or emails to us while we are offline.
Chassis Parts For Caterpillar,Caterpillar Chassis Parts,Caterpillar undercarriage Suspension Parts,Caterpillar Front Axle Parts
Hangzhou Holdwell Mechanical&Electrical Co.,LTD , https://www.holdwellparts.com