SU929670A1 - Process for producing pigment titanium dioxide of anatase of rutile modification - Google Patents

Description

(5) METHOD FOR OBTAINING TITANIUM PIGMENT DIOXIDE ANATASTIC OR RUTHLY

I

The invention relates to the production of titanium dioxide pigment rutile and anatase modification by sulphate technology, and can be used as a white pigment in the paint industry.

A method of producing titanium dioxide pigment according to a sulfuric acid scheme involves the decomposition of the titanium-containing raw material sulfuric acid leaching of the melt formed in this process, thermo hydrolysis of the titanium sulfate solution obtained by leaching, forming a precipitate of titanium dioxide, 2Dm, and the volume of the sample, which is used in the leaching of titanium sulphate titanium dioxide, using the sulfuric acid solution of titanium dioxide. slurry, washing the sludge with a gas turbine drum, treating it with an ammonium-containing compound, then neutralizing the suspension DGT with sulfuric acid and washing, and Zotem salt treatment of hydration and drying.

Titanium dioxide in suspension with potassium hydroxide and phosphoric acid, followed by filtration of the suspension and calcining the separated paste 1.

This method is rather multistage and allows to obtain pigment only in rutile form.

There is also known a method of obtaining

To pigmentary titania dioxide of anatase or rutile odification using sulfuric acid technology, which includes salt processing of hydrated titanium dioxide suspension with sulfide potassium and phosphoric acid or zinc sulfate in the presence of about 2% rutile nuclei, subsequent filtration of the suspension and calcination of the separated paste;

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Claims (2)

Upon receipt of the anatase product, the salt treatment of GDT by this method is carried out with potassium sulfate and phosphoric acid, and the rutile product - with potassium sulfate and zinc sulfate. The known method, however, requires a significant amount of expensive potassium sulfate in the amount of the order of 0, ii5-0.5H with the consumption of phosphoric acid in the amount of 0.72% and zinc sulfate-0, to TiOQ in suspension. The aim of the invention is to reduce the consumption of potassium compounds during the salt treatment in the method of obtaining titanium dioxide enatase enatiazyl or rutile modification with an increase in pigment yield. titanium sulfate potassium sulfate and phosphoric acid to obtain anatase pigment or potassium sulfate and zinc sulfate in When rutiliruyuschih presence of nuclei to obtain a rutile pigment blowing .After filtering the slurry and calcining the separated paste on soleobrabotku in both cases by the additional titanilammoniysulfat administered in an amount of 2-3% of the IE, to the titanium dioxide in the slurry. The proposed method makes it possible to reduce the consumption of potassium compound in comparison with the known one more than twofold or to completely eliminate their use depending on the dosage of titanyl ammonium sulfate. Thus, with the consumption of the latter 2.5%, the consumption of potassium compounds is reduced to 0.11% of KQJS when anatase and rutile are obtained, and the consumption of titanyl ammonium sulfate makes it possible to completely exclude the introduction of potassium compounds to the salt treatment. In addition, the proposed method allows to increase the pigment yield, since titanium introduced with titanyl ammonium sulfate almost completely remains in the paste of hydrated titanium dioxide due to hydrolysis of this salt and the formation of insoluble titanium compounds with phosphoric acid and potassium sulfate. Moreover, the introduction of titanylammonium sulfate in an amount of less than 2% TiO (92 4 to TiOfj in suspension does not allow to reduce the consumption of potassium salt, and more than 3% leads to a decrease in the yield of pigment due to the estimated increase in dissolved titanium content in the filtrate. not inferior to the product obtained in a known manner. EXAMPLE 1. To 100 ml of a GDT suspension with a content of 250 g / l T10 add up to 0.05 g of potassium sulphate to 0.504 (0,), 0.33 ml phosphoric acid HjPO (0.72% and 2.9 g of titanylammonium sulfate with a content of 21.6% Log of 10.5% NH (2, S% TiOij). The suspension is stirred for IS min, filtered on a Büchner funnel, and the separated paste is calcined for 2 h RI. 25.9 g of anatase modified pigment with the following indices are obtained: disintegration capacity of 1180 sr whiteness 95.9 conventional units and pH 6, AO. PRI mme R 2. To OO ml of a GDT suspension containing 250 g / l TiO (2 add 0.33 ml (0.72%) g of titanyl ammonium sulfate with 2-6% T} 0, and 10.5% NHt Orj .. Next, the suspension is treated as in Example 1. 26.0 g of anatase-modified pigment are obtained with the following indicators: disintegration capacity of 1170 sr. unit, whiteness 55.9 used units pH 6.35. PRI MER 3- Suspension Tio (treated as in example 1, but with the addition of 0.05 g (0.11% KijO) 0.37 g ZnSO (0.73% ZnO) and 2.9 g titanylammonium sulfate with a content of 21.6% (1 and 10.5 MN (2.5% TlOfj). 26.1 g of rutile pigment with the following indicators are obtained: the bleaching capacity is 1590 used units, the whiteness is 95.1 used units pH 6.8, rutile content of 5b%. Example. Similar to Example 3, but with the addition of 0.125 g (0.28% Kfip) and 0.33 ml of 55% (0.72%) and 2.31 g of titanyl ammonium sulfate into the suspension. containing 21.6% TiOo and 10.5% NH (2% TiOr). As a result, 25.8 anatase-modified pigments with the following indices are obtained: times bleaching ability of 1180 conventional units, whiteness of 95.8 conventional units, pH 6.50. 5 Trifty: 100 GDT suspensions of the indicated concentration are treated with O, -37 g ZnS04 (0.75 ZnO), 3 , g titanylammonium sulfate (21.6. and 10.5 NH) in an amount of 3% by TiOn and 10 ml of embryos with a content of 50 g / l TiOn (2). A pigment in the amount of 26.2 g of rutile modification is obtained with the indicators: whitening capacity of 1580 conventional units, whiteness of 95.2 conditional pH 6.8, content of rutile 95. EXAMPLE 6. 100 ml of suspension and a DGT of the specified concentration is processed by adding KnS04 (0.11) , 0.33 ml of 55% Naro. (0.72) and 2.9 g of titanylammonium sulfate with a content of 21.6 TU and 10.5 MNF (2.5 TU,). As a result, 25.9 g of anatase-modified pigment with the following indicators are obtained: the disintegrating power is 1180 conventional units, the whiteness is 95.9 standard. hell., pH 6, cho. For comparison, the following examples are described by a known method. Example 7. To 100 ml of a GDT suspension with a content of 250 g / l are added 0.21 g of KoS04 (0.5 K ,, 0}, 0.37rZnS04 (0.75 ZnO) and 10 ml of sprays with a content of 50 g / l TiOn (2), stirred for 15 minutes, filtered on a Buchner funnel, and calcined for 2 hours at 850 ° C. The pigment obtained in an amount of 25.6 g of rutile modification has the following characteristics: disintegrating power 1580 standard units, whiteness 95.0 sr. unit-, pH 6.8, rutile content 95. Example 8. To 100 ml of a suspension of GDT with a content of 250 g / l TiOr add 0.25 g of K, jS04. (0.5 CLO) .. , and 0.33 ml of PEOPLE (0.72 706 and further, the suspension is treated as in example 7. 25.3 g of pigment are obtained and anatase form with indicators: the bleaching capacity of 1160 conventional whiteness 95.6 conventional units, pH 6.60. The proposed method of producing pigmentary titanium dioxide allows, while maintaining product quality by more than 2 times, to reduce or eliminate completely the consumption of potassium compounds and to increase the yield of titanium by 1.7-2.8% due to the use of titanylammonium sulfate, which is a waste product of rare metals. CLAIMS A method for preparing pigmentary titanium dioxide of the anatase or rutile modification of the sulfuric acid technology comprising soleobrabotku suspension of hydrated titanium dioxide sulfate, potassium and phosphoric acid or potassium and zinc sulfate sulfate in the presence rutiliruyuschih nuclei, subsequent filtering of the slurry and calcining the separated paste otlichayuschiyg that , in order to reduce the consumption of potassium compounds with an increase in pigment yield, titanylaminon is additionally added to the salt treatment Hisupat in the amount of 2-3 titanium dioxide in suspension. Sources of information taken into account in examination. US Patent N ° 3518050, l. 23-202, published. 1970. 2. Belenky EF, Riskin I.8. them and technology pigments. L. Chemie, 197, p. 138-139.