SU1331828A1 - Method of processing sphene concentrate - Google Patents

Abstract

The invention relates to the technology of processing titanium-containing raw materials for titanium pigments and allows to improve the low-technical properties of the pigment and simplify the process of processing of sphene concentrate for titanium pigment. A method of processing sphene concentrate includes I decomposing it with a solution of sulfuric acid containing 950-11 (70 g / l H-jSO, at 130-155 C for 1-4 h, separating the solid residue, holding the liquid phase to a residual concentration in it TiOj 0 , 5-3 g / l, followed by separating the solid part from the suspension and dissolving it in water, thermo hydrolysis of the obtained titanium solution in the presence of embryos in the boiling mode, and subsequent operations of the conventional process of processing titanium hydroxide sludge into pigment. properties: whitening ability of 1680-1800 conventional units, whiteness of 97.3- 97.6 conventional units, covering power of 32- 38 g / m. Decreases by 2.5-3 times the processing time and the number of stages. 3 z. p, f-ly. (L

Description

950 g / l NdZots, 130s and withstand

The invention relates to titanium-containing hydrometallurgy of raw materials during processing of titanium pigments and can be used in the paint industry, in the manufacture of paper and plastics.

The aim of the invention is to improve the low-tech-nical properties of titanium oxide pigment and simplify the processing of sphene concentrate.

Example 1, Take 1 kg of sphenic concentrate, mix it with 3.5 liters of sulfuric acid containing the mixture is heated to

4 h. Then the solid residue is separated from the liquid phase, the latter is maintained at the same temperature to a residual concentration of TiO 3 g / l in it. The suspension is filtered (the filtrate volume is 3.0 l, C c up to 885 g / l), the titanium precipitate is dissolved in water at 60 ° C for A h. The resulting solution containing, g / l: TiO 280; , five; 450, subjected to thermohydrolysis.

Thermohydrolysis is carried out in the presence of anatase embryos in the amount of 0.5% relative to TiO, j in the initial solution in the hippen mode. Duration of boiling for 5 hours with dilution of hydrolysis pulp after 2.5 hours with water (20% of the original volume). The precipitate of titanium hydroxide is separated from the liquid phase and washed with water at a Т: Ж 1: 4. The washed precipitate is subjected to salt treatment, for which the precipitate is melted in water to a concentration of TiO- in the pulp of 300 g / l, added with respect to TiO,%: rutile for embryo 1.5 (TiO), zinc sulfate 1.0 (calculated on the ZnO) potash 0.3 (per K20), stirred for 0.5 h and filtered. The solid residue is calcined at 850 s until the content of rutile in the calcined product is 96%. The product has pigmentary properties: a bleaching ability of 1680 used units white 97.5 used units, coverage of 38 g / m.

Example 2. Take 1 kg of sphenic concentrate and mix it with 2.5 liters of sulfuric acid containing 1100 g / l HjSO, mix the mixture to heat and hold in this mode for 1 hour. Then the solid residue is separated from the liquid phase, the last one being same temperature to residual

AT

0

total content in it TiOj 0.5 g / l. The suspension is filtered (filtrate volume 2.0 l, 1055 g / l), the titanium precipitate is dissolved in water for 1 hour. The resultant is thus obtained. the solution is subjected to thermohydrolysis analogously to example 1 with obtaining a pigment titanium of rutile modification with the following properties: a disintegrating ability of 1800 used units, a whiteness of 97.6 used units, an opacity of 35 g / m.

Example 3. Take 1 kg of sphene concentrate and mix it with 3 l of sulfuric acid containing 1055 g / l (2 l of recycled acid in example 2 and 1 l of additional sulfuric acid with a concentration of 1055 g / l HjSO). The mixture is heated to 145 ° C and held for 2.5 hours. The solid residue is separated, and the liquid phase is maintained at the same temperature to a residual TiO 5 content of 1.5 g / l. The suspension is filtered (the filtrate volume is 2.5 l), the titanium precipitate is dissolved in water at 75 ° C for 2 hours. The resulting solution is subjected to thermohydrolysis as in example 1 to produce rutile titanium dioxide pigment with the following properties: 1885 crushing capacity. unit, whiteness 97.3 sr., opacity

32. 5 I

The invention allows to obtain high quality titanium dioxide pigment, while the duration of the process is reduced by a factor of 2.5-3.

0 and decreases the number of stages of technological redistribution. Extraction of pigment up to 92% and taking into account the use of non-concen trated TiOj in circulation as a residue after

5, when preparing a calcium silicate filler, is at least 95%.

Claims (4)

Invention Formula 0 one . Sphenic processing method concentrate, including its decomposition with a solution of sulfuric acid by heating, holding the reaction product g, separating the solid part, dissolving it in water and thermo hydrolising the obtained titanium-containing solution, followed by processing into titanium oxide pigment, about tl and 0 313318284 for the purpose of 2. The method according to claim 1, about tl and h and improving the small-technical properties of u and with the fact that the decomposition is up to pigment and simplification of the process, the separation of the solid residue; the concentrate is carried out; the solution is dissolved for 1–4 hours of rum of sulfuric acid containing 950 3. The method according to p. 1, about t l and h and 1100 g / l HjSO at 130-155 ° C, section I and with the fact that the hard part The solid residue from the obtained cusp is dissolved in water at 60-90 ° C in tepencia and 1-4 hours are subjected to incubation. the obtained liquid phase to residual u 4. The method according to claim 1, wherein the content of TiO is 0.5–3 g / l, followed by the fact that sulfuric acid After separation from the suspension of the solid part of the suspension of the solid part from the suspension, the filtrate is used to dissolve the decomposition of the concentrate.