SU1611908A1 - Method of producing titanium-calcium pigment - Google Patents

Abstract

This invention relates to chemical technology, in particular to the preparation of inorganic pigments. The purpose of the invention is to increase the whiteness and dispersibility of the pigment while reducing the duration of the process. The goal is achieved by the fact that the titanium sulfate salt is mixed to active calcium oxide, taken in a 1.5-3.5% excess of its stoichiometric amount relative to SO ₃ - acidic in the titanium salt. The resulting product is calcined and the calcination of the calcined product is carried out with the addition of sodium silicate in an amount of 0.05-0.25% SIO ₂ and aluminum sulfate in an amount of 0.3-0.8 AL ₂ O ₃ in relation to the weight of the product.

Description

The invention relates to chemical technology, in particular to the preparation of inorganic pigments used in the manufacture of paints, paper, plastics.

The purpose of the invention is to increase the purity and dispersibility of the pigment with the reduction of the survival rate of the process.

Example 1. 1 kg of titanium sulfate salt (titanylammonium sulfate) is mixed with 155 g of active calcium oxide (3.5% excess from stoichiometric amount to SOj-acidic in titanium salt) and 1 g of mineralizer - potash. The mixture is calcined at 650-700 ° C for. 2, 5 h. The calcined product is subjected to wet grinding with the addition of sodium silicate in an amount of 0.05%., And

then (after 20-30 minutes) aluminum sulfate in the amount of 0.8% A1 „0z relative to the weight of the product. The total grinding time is 2 hours. Suspension is filtered, the precipitate is dried at 150-180 0. The resulting titanium-calcium pigment (TKP) (TU content 34.0%) has the following small p-technical properties (whiteness - (B), ability - (P), ukrshistosti - (y), oil absorption - (M), dispersibility - (D));

B, used

P, used

Y, g / m

M, g / 100 g of pigment

D, micron

96.0

450

69.5

26.0

50

eo

Example 2. 1 kg of titanium sulfate salt (titanyl sulfate dihydrate) is mixed with 183.4 g of active

316

calcium oxide (excess stoichiometric amount to SOg- | acid in salt) and 7.3 g of mineralizer - 1g. The mixture is calcined at 650- | 700 C for 3.0 hours. The calcined product is subjected to wet grinding with the addition of sodium silicate in a quantity of 0.15% SiO, and then (after 120-30 minutes) aluminum sulphate in - quality 0.53% in relation to the weight of the product. The total grinding time is 2 hours. The suspension is filtered, the precipitate is dried at 150-180 ° C. The obtained TCP (T content 10.234, 2%) has the following low-technical properties:

B, cond., Unit 95.8

P, used . 470 W,

N, g / 100 g of pigment 26.8. D, μm45

Example 3, 1 kg of titanium sulphate (anhydrous titanyl sulphate) is mixed with 354.2 g of active calcium oxide (1.5% excess from a stoichiometric amount to 50% acid in salt), 6 g of mineralizer are added - potash. The mixture is calcined at 650-700 ° C for 3.5. The calcined product is subjected to wet grinding with the addition of sodium silicate in an amount of 0.25% SiO, and then (after 20–30 minutes) aluminum sulphate in the amount of 0.3% relative to the weight of the product. The total grinding time is 2 hours. The suspension is filtered, the precipitate is dried at 150-180 ° C. The obtained T1SH (TiOg content 31.5%) has the following metal-technical properties;

B, used, P, used U, G / m

M, g / 100 g pigment microns

95.0

600

60.1

40

40

D,

example 4 (by a known method). 1 kg of titanium sulfate salt - titanium sulfate, la and ammonium, is mixed with 150 g of lime and 2 g (1% of TiO) of the mineralizer - potash. The mixture is calcined at 650-700 ° C. “The calcined product is crushed. As a result, a pigment composition containing 35.4% of titanium dioxide is obtained, having the following characteristics:

Q

0

five

thirty

35

B, used

P, used

M, g / 100 g of pigment

Y, g / m

D, micron

93.4

440

26.3

70

78

Examples suggest. that when implementing the proposed method in comparison with the known one, an increase in whiteness is achieved (by 2-3 standard units), a decrease in the dispersibility index by 20-35 µm without deterioration of other pigment properties of TCP. In addition, the calcination time of the mixture is halved.

When CaO is added to the reaction mixture in an excess of 1.5%, the calcination time increases, whiteness and dispersibility decrease, an excess of CaO 3.5% practically does not affect the calcination time and the whiteness of the SCT, but leads to a decrease in bleaching capacity and opacity.

The additive, when grinding the calcined product of sodium silicate in the amount of CO, 05% SiO and aluminum sulphate: -053% 3 leads to a decrease in whiteness and dispersibility of T1Sh. The consumption of sodium silicate and aluminum sulphate in the amount of 0.25% SiO,, 8% has practically no effect on the whiteness and dispersibility of the TCH, but reduces its whitening ability and hiding power.

Claims (1)

Formula from. bratis 0 five 45 0 A method for producing a titanium-calcium pigment, which includes mixing the sulfate titanium salt with active calcium oxide, adding potash to the mixture, calcining the mixture and grinding the calcined product, in order to increase the brightness and dispersibility of the pigment while reducing the duration of the process Calcium is taken in 1. ,, ,, 5% excess. The stoke is stoichiometric in relation to SOJ acid in the titanium salt, and grinding of the calcined product is carried out with the addition of sodium silicate and in an amount of 0.05-0.2 5% SiOg. and aluminum sulfate. in the amount of O, .3-0.8% .A i OOg. in relation to the mass of the product i-.