A method of obtaining a pigment of titanium dioxide from titanium containing waste

 

(57) Abstract:

The invention relates to a method for producing pigmentary titanium dioxide from titanium containing waste, which can be used in the manufacture of paints and as a component to create white. The invention consists in the interaction of such materials with concentrated hydrochloric acid density 1,145-is 1.175 g/cm3when the ratio of T: W 2: 7 in the calculation of the titanium to form a solution, which is diluted with double amount of water, and then treated with half the amount of ammonium hydroxide solution with mass fraction of 25%, then heated to boiling, defend, produce three decanting sludge, the sludge is dried at 60 to 90oC. This method allows you to get the product from waste. table 4.

The invention relates to inorganic chemistry and metallurgy of titanium, in particular a process for the production of titanium dioxide from titanium containing waste (titanium chips, scraps, etc.,) for the subsequent production of titanium pigment for paint and varnish industries.

A method of obtaining titanium dioxide (white E. F., Raskin I... Chemistry and technology of pigments. L.: Chemistry, 1974, S. 148-152), to the C, chlorination in the environment of molten chlorides (pages 148-149), cleaned from impurities (Al, V, Si) (page 150), obtaining TiCl4the hydrolysis of aqueous solutions (page 151). Vapor-phase hydrolysis proceeds manual (page 152); to reduce heating of the aqueous solution of TiCl4apply diluted HCl, which eliminates premature hydrolysis (page 151). During annealing of the hydrolysis product with the addition of mineralizers receive TiO2where 90% of the particles less than 1 micron. However, this TiO2has low resistance (page 152).

The closest technical level and the achieved result is a method of obtaining titanium dioxide from ilmenite ore (the Method of obtaining titanium dioxide from ilmenite ore. Application 2405271, Germany/Sergey A. Berkovich , Oakvili, Outario (Kanada). N 2405271; Publ. 8.02.79, MCI CO G 23/06 (Inventions in the USSR and abroad. Inorganic chemistry. 1979, No. 6, V. 49, S. 14)).

The feedstock is treated with concentrated hydrochloric acid. Requires precise dosing of the quantity of hydrochloric acid for the actions of its iron (III), iron (II) and titanium.

This method has a low technical level, due to the necessity of transfer of iron (III) iron (II) using a reducing agent. Receiving the acessa, which generally leads to a reduction in the efficiency of the applied method.

The disadvantages discussed above of technological processes of production of titanium dioxide determine the relevance of the solution is the development of a more perfect way to retrieve it.

The technical result of the proposed method is to obtain pigment titanium dioxide in the process of interaction of such waste with hydrochloric acid, further diluting the resulting solution double the volume of water to accelerate the hydrolysis of TiCl4and further processing the resulting precipitate is half the volume of ammonium hydroxide solution with mass fraction of 25% for the best precipitation of titanium hydroxide, subsequent boiling of the solution to create more titanium hydroxide, decanting after sedimentation, filtration and drying at 60 to 90oC. This method allows you to create a new technology of production of titanium dioxide.

The inventive method of obtaining titanium dioxide does not require complex hardware design, the use of any reducing agents for iron and provides a relatively high yield.

Specified technical resurrected ammonium allows you to allocate a greater amount of titanium ions in the precipitate.

Creating a new method of obtaining titanium dioxide on the basis of such wastes, when these actions, allows to obtain titanium dioxide rutile modification, with a particle size of 25-30 microns.

With respect to T:W - 1:2 hydrochloric acid and 1:0.5 for solution of ammonium hydroxide at the boiling yield is 80-90%.

The essence of the invention lies in the fact that such waste chips or scraps from processing of titanium and its alloys (W-00 W-20) with a titanium content of not less than 85% (T) is treated with concentrated hydrochloric acid (G) density 1,145-is 1.175 g/cm3. The resulting solution was diluted with double the volume of water to accelerate the hydrolysis titanoboa acids, then the residue is treated with half the amount of ammonium hydroxide solution with mass fraction of 25% for the best precipitation of titanium hydroxide, to produce boiling of the solution for the formation of titanium dioxide, decantation after settling, filtration. The precipitate is dried at a temperature of 60-90oC.

The invention relates to the chemistry and technology of pigments based on titanium dioxide and can be used for a wide production paint promyshlennosti waste.

The effectiveness of the proposed method and the proposed technological regime to achieve this goal is illustrated by the following examples.

Example 1. Take such waste (crushed chips titanium alloy VT-I-O, the chemical composition of which is given in the table. 1), and add hydrochloric acid in the ratio 2:7 in the calculation contained in the sample titanium.

Produce stirring. The obtained dark blue solution was diluted with double the volume of water to enhance the hydrolysis of the formed titanium salts (see table. 2).

The residue is treated with half the amount of ammonium hydroxide solution with mass fraction of 25% for the best precipitation of titanium hydroxide (see tab. 3).

The solution was heated to boiling, boil for 20 minutes to destroy fragile titanium hydroxide. Make 3 meals a day decanting after settling. A precipitate of titanium dioxide white. Filtered, then dried at 60 to 90oC. the result is titanium dioxide rutile modification with a particle size of 25-75 microns.

Specific data according to the obtained results are shown in table. 2, 3.

The smaller the ratio of T:W 2:5 in the experiments on the dissolution Titania the number of T:W 2:10 also does not allow to obtain the optimal size of the particles, also reduced the yield of 50-70%.

The ratio of T: W 2:7 allows to obtain the optimal size of the particles (25:30 μm) and higher yield (50-90%).

The use of smaller amounts of water does not allow you to bring the hydrolysis of titanium containing salt to produce the desired amount of titanium dioxide, increase the size of the particles (40-70 μm) and low yield (30-70%). More water dilutes the solution, without impacting on the reduction of particle size (30-60 µm) and increased yield (40-70%).

We offer you the best option with a ratio of T:W 2:7 and if a double dilution water allows to obtain smaller particles (25-30 microns) and greater yield.

An important role in obtaining pigment plays and the use of ammonium hydroxide solution (PL. 3).

Greater volumetric ratio of solution : ammonium hydroxide solution gives larger sediment particles (40-60 μm) and low yield (60-80%).

Small volumetric ratio of these components gives smaller particles (30-70 microns) and greater variation in percentage of yield.

Sludge treatment half rotovoi products (70-90%).

Example 2. In example 1 to produce the processing of such waste alloy W-20 (chemical composition shown in table. 4) hydrochloric acid.

After two-fold dilution with water the resulting solution make processing the obtained precipitate with ammonium hydroxide solution as in example 1. The solution was heated to boiling, boil for 20 minutes Then produce decantation after settling, filtration and drying at 60 to 90oC. the result is titanium dioxide rutile modification with a particle size of 25-75 microns.

The proposed method of obtaining titanium dioxide as a component included in paint products, such waste was first carried out by the authors, has a scientific novelty and is, according to the authors, the basis for issuance of a certificate of invention.

For the claimed invention in the form as it is characterized in the claims, confirmed the possibility of its implementation using the above-described manufacturing methods, conditions and modes of its implementation.

The method of producing titanium dioxide from titanium containing wastes as proposed in the present invention, it provides an implementation of C is umyshlenna applicability.

A method of obtaining a pigment titanium dioxide rutile modification by interaction of such materials with concentrated hydrochloric acid density 1,145 - is 1.175 g/cm3when the ratio of T : W 2 : 7 in the calculation of the titanium to form a solution, wherein the titanium containing solution is diluted with double amount of water, and then treated with half the amount of ammonium hydroxide solution with mass fraction of 25%, heated to boiling, defend, produce three decanting the precipitate and drying at 60 - 90oC.

 

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