Method of obtaining mixed coagulant from mineral raw material

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry. Mixed coagulant from mineral raw material is obtained by dissolution of boehmite-kaolinite bauxide in autoclave with hydrochloric acid with concentration 220 g/l with ratio S:L=1:6 for 1-3 hours in interval of temperatures 150-180°C.

EFFECT: invention makes it possible to increase coagulation ability of mixed coagulant - hydrooxichloride of aluminium and iron with concentration by Al2O3 2,32-6,87 and by Fe2O3 0,94-1,02 wt %, in water purification: by turbidity and colour.

2 dwg, 6 tbl

 

The invention relates to chemical industry and nonferrous metallurgy, can be applied upon receipt of the mixed coagulant on the basis of hydroochloride aluminum and iron which finds wide application in various industries, in particular for the treatment of drinking and industrial waters.

Known methods for the preparation of hydroochloride aluminum from various types of aluminum-containing raw materials: aluminum scrap, aluminum hydroxide, aluminum metal by reacting them with hydrochloric acid (Zapolsky A., Baran A. A. Coagulants and flocculants in the water treatment process. L.. Chemistry, 1987, pp. 89-96).

The main disadvantages of these methods are the low degree of extraction of aluminum in the solution, low coagulating properties of the product, a multistage process and the complexity of hardware design.

The closest to the proposed is a method of producing hydroxochloride aluminum from technical aluminum and hydrochloric acid (RU 2300499 claimed 27.12.2005) by the interaction of technical aluminum hydroxide with hydrochloric acid at atmospheric pressure.

The disadvantages of this method is the use as raw materials of technical aluminum hydroxide, expensive and scarce reagent compared with boehmite-kaolinite the bauxite and low koaguliruut�e ability.

The problem to be solved by the present invention is to provide a method for producing the mixed coagulant from mineral raw materials.

The technical result of the invention is the use as raw material boehmite-kaolinite bauxite and increase the clotting ability of the coagulant in the purification of water: turbidity and color.

The technical result is achieved in that in the method of producing the mixed coagulant from mineral raw materials according to the invention as a raw material is used boehmite-kaolinite bauxite, which is dissolved in an autoclave with hydrochloric acid with a concentration of 220 g/l at a ratio of T:W=1:6 for 1-3 hours in the temperature range 150-180°C to obtain a solution of hydroochloride aluminum and iron at a given concentration of Al2O32,32-6,87, Fe2O30,94-1,02 wt.%.

The amount of hydrochloric acid is taken as 125% of the stoichiometric required amount, the ratio of T:W in this case will be 1:6.

Increased the clotting ability is due to the use of boehmite-kaolinite bauxite, which in addition to aluminum compounds include iron compound when dissolved in the autoclave with hydrochloric acid these compounds also pass into the solution and improve the clotting ability of the product.

As mineral �raw materials was selected boehmite-kaolinite bauxite Ikenskoe field. The composition of the sample are presented in table 1.

Bauxite, crushed to a particle size of 0.1 mm, was dissolved in hydrochloric acid in a concentration of 220 g/l in the temperature range of 150-180°C. the Ratio of T:W was made 1:6 for all experiments. The process time was 1, 2 and 3 hours. Upon completion of the experience liquid phase was separated from nerastvorimogo residue by filtration. The resulting solutions, the solid residue (cake) and the washings were analyzed for the content of aluminum oxide and iron. These experiments are presented in table 2.

As can be seen from table 3, when the temperature increases from 150 to 180°C, the aluminum content (in terms of Al2O3) increases from 2,32 to 5.64%, and with increasing duration of dissolution from 1 to 3 hours content increases with 5,51 before 6,87%, the iron content (based on Fe2O3in all experiments is in the range of 0.94-1.02% and the temperature change and time dissolve a significant impact on the content of iron in the solution has not.

From these data it follows that the use of boehmite-kaolinite bauxite allows to obtain a solution concentration of 2.32-6,87% Al2O3and 0,94-1,02% Fe2O2that can be used as high-performance mixed coagulant.

Further conducted experiments to determine the effectiveness of coagulation. The main parameters were the flow of real�NTA (dose), turbidity, chromaticity. Doses of coagulants were expressed in mg/L.

As the experiment method used the Express method with short-term sedimentation. Turbidity was determined in the upper layer without filtering, color with filtration through a filter of "blue ribbon". Each experiment for each dose of coagulant was performed 3 times, and the result was taken as the average value.

In all the experiments, water is a surface water source - water river (Moscow, Moskvoretskaya water source). The tests were carried out at low temperatures, as the temperature increases, the processes of hydrolysis and coagulation go faster and the difference in results may be less clear. The data presented in table 3.

The test results of coagulants are presented in table 4 (standard coagulant. derived from technical aluminum hydroxide) and tables 5, 6 (mixed coagulant). Doses of coagulants were taken in the range of 3.0 to 15.0 g/l, so as to Moskvoretskaya water with specified indicators of optimal dosage found in this area.

According to the obtained results the dependences of the turbidity and color from the input dose of coagulant. The dependence of residual turbidity of water from the coagulant dose is presented in figure 1. The optimal dose of coagulant is 9.0 mg/l, which is being�tion residual reduction in turbidity compared with a standard coagulant. Figure 2 shows the dependence of the residual color of the treated water from the coagulant dosage. When using a coagulant dose of 9.0 mg/l there is a significant decrease in chroma of water compared to using the standard coagulant.

Thus, the proposed method significantly improves the clotting ability of the product by the main parameters for water treatment: colour and turbidity.

A method of producing the mixed coagulant from mineral raw materials, wherein the raw materials used boehmite-kaolinite bauxite, which is dissolved in an autoclave with hydrochloric acid with a concentration of 220 g/l at a ratio of T:W=1:6 for 1-3 hours in the temperature range 150-180°C to obtain a solution of hydroochloride aluminum and iron at a given concentration of Al2O32,32-6,87, Fe2O30,94-1,02 wt.%.



 

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