SU1414782A1 - Method of producing synthetic rutile from concentrated titanium-containing products of titanomagnetite processing - Google Patents

Abstract

This invention relates to a process for the processing of titanomagnetites and is aimed at increasing the yield of titanium into artificial rutile and simplifying its preparation. The method of obtaining artificial rutile from enriched titanium-containing products of the processing of titanomagnetites is carried out by reducing and separating iron, followed by treatment of the titanium-containing product with hydrochloric acid of 12-18% concentration at T: W 1: (8-10) and after washing with additional treatment of the solid product 3-5% solution of sodium hydroxide at T: W 1: (4-6). The degree of extraction of titanium in rutile is 98.5-99.0%. 2 tab.

Description

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The invention relates to a process for the processing of titanomagnetites and can be used in the production of technical titanium dioxide. The aim of the invention is to increase the yield of titanium in the target prod uct and simplify the process for producing artificial rutile. The essence of the method is as follows. Titanium-magnetite concentrates contain a significant amount of iron and a small amount of titanium and have mainly the composition: 5-15% TiO, 55-65% based on oxides 75-85% and 5-15% other impurities, in t, -h SiOj, CaO,, MgO, MnO).

i To obtain rutile, titanomagnetites are pre-enriched with TiO. At the same time, they are subjected to, for example, reducing firing I (metallization of iron) at 900–1000 ° C, followed by separation of iron, or by grinding and magnetic separation, with the release of a titanium-containing finely divided product, wt.% : TiO-j 35-50; Fe 5-15; SiOi 5-15; MgO Z-IZ; MnO 1-5; CaO 2-10; 5-15; , 0.5–5 and others, either by electrofusion at 1500–1600 ° С with the formation of titanium slag of approximately the described composition

The titanium-containing material enriched in this way is subjected to treatment with leaching with hydrochloric acid of 12–18% concentration at T: W 1: 8–10 (with a total twofold excess in stoichiometry), followed by treatment of the solid product after washing with 3-5% a solution of sodium hydroxide at T: W 1: 4-6.

At the same time, leaching of HC1 with a concentration of less than 12% is not effective enough to purify the product from impurities, and with an increase in concentration to 20%, the loss of titanium with acid solutions increases and the degree of extraction of TiO 2 decreases. The ratio T: L at given concentrations of acid depends on the composition of the material being processed. Moreover, W: T increases with a constant content of impurity components and decreases with decreasing content. The optimal conditions for alkalization are 2 hours and the temperature is 106-110 ° C.

The product from hydrochloric acid Bbmie is dried at 110-115 ° C for 3 hours. T: W 1: A with alkaline

with Q

d

five

the treatment corresponds to the stoichiometric amount of alkali to bind all the SiO in the form. An increase in the concentration of NaOH (T: W above 1: 6) does not lead to an improvement in coloring. The alkaline treatment process continues under these conditions for 20-30 minutes. The resulting titanium product was a hydrated titanium dioxide of x-ray amorphous structure. To be converted into rutile form, it is calcined at 800-900 C. In this case, TiOj H-jO first loses its hydrate water, then goes into an antase structure, and at 800 C it is taken. It dies a stable rutile form.

Example 1. 500 g finely ground to 250 mesh. titanium slag composition, wt.%: TiOj 42,7; FeO 10.3; SiOi 12.4; CaO 13.1; MgO 2.9; MnO 1.8, 14.5; 0.2, obtained from electrofusion of titanium-magnetite concentrate, is treated with 15% hydrochloric acid at (1.8-fold excess of acid by stoichiometry) at 106-110 ° C for 2 h constantly stirring. The resulting pulp is centrifuged, the hydrochloric acid solution is poured, and the solid phase is washed three times with acidified hot water (the TiO content in the enriched titanium concentrate is 83.3%). Then it is treated with a 5% NaOH solution (T: W 1: 6) at the boiling point for 30 minutes. The pulp is filtered, the solid Laza is washed three times with hot, weakly alkaline water, dried and calcined at 800-900 ° C. The result is 216.4 g of artificial rutile containing,%: TiO-i 97.2; SiOo 2.1; 0.4; other examples are si 0.3. The degree of extraction of titanium from slag is 98.5%, which is 8.2% higher than in the lime process.

Example 2. 500 g of titanium-containing product containing, in wt.%: TiOi 49.5; 5.7; SiO 4.1; CaO 4,5; HgO 12.3; MPO 1.5, 4.8; 4.3; 11.7, from the processing of Lankaran placer titanomagnetite concentrates with the slag-free method are treated with 15% hydrochloric acid at T: W 1: 8 (1.8-fold excess of stoichiometry).

Rni) at 106-110 ° C for 2 hours, constantly stirring. The resulting pulp is subjected to centrifugation, the hydrochloric acid solution is drained, the solid phase is washed three times with acidified water, and the TiO content. reaches 92.1%. Then solid base is treated with 3% NaOH solution at T: W 1: 6 and boiling point for 20). Aulpur pulp, the solid phase is washed three times with hot, weakly alkaline water, dried and calcined at HEO

. 249.5 g of artificial rutile are obtained, containing,%: TiOj 98.2; SiO 1,2; FejOg 0.3; other impurities of 0.3. The degree of extraction of titanium from the original titanium-containing product is 99.0%,

.B Tables 1 and 2 describe examples and results of the proposed method using the example of various enrichment products of titanomagnetites after alkali acid and alkaline treatment, respectively, g

Pr B-tt at 9 t. hm L, Compositions 1-11 POTM by restoring and separating by an elemental magnetic separation, i.c.; TiOf 49.5; Fe 5.7; SiO, 4.1; CaO 4,5; MgO 12.3} MnO 1.3; 4.8; 4.3; NajO 11.7, Compounds 12-14 te products that, as in, p contain,

Mac.Xt TiOt 35.4; I .S; SiOt 1 &5; CaO-b) MgO t1,3; MitO 1,2t AliOj 6,4j CiTtOj 2,8; 12.1. Composition 15 HNTK - by reducing and separating iron by fusible (solid fuel), n / a: TiO, FeO 10.3;

SlOj 12.4; C "0 13.1; 1 2.9} MnO 1.8; AliOj I4,5j V.tOj 0,2;

If

Table 1

5U1A7826

Results of despreading () are given in

Table 2.

product of hydrochloric acid leach. Composition of product,%; TiO-i 84.0; SiO 15, A Conditions for obtaining: 15% HC1, T: W 1:10, 2

The simplification of the proposed method is determined by the elimination of the need to carry out the complex and long stages of decomposition of the titanium-containing

neither (t

Table 2.

table 2

: product of sulfuric acid, water leaching, filtration, evaporation under vacuum and hydrolysis of sulphate solution, at approximately the same cost of reagents, the staging of processing is halved and the duration of operations is 2 times lower,

F o r mula inventions

The method of obtaining artificial rutile from enriched titanium-containing products of the processing of titanium-magnetites by reducing and separating iron, including the treatment of the initial titanium-containing product with hydrochloric acid, is separated.

 calcined from a solid product with acidified water, calcination, characterized in that, in order to improve the yield of titanium in the target product and simplify the process, the titanium-containing product is treated with hydrochloric acid of 12-18% concentration at T: F 1: 8-10, and the solid product immediately after washing is further treated with a 3-5% solution of sodium hydroxide at T: W 1: 4-6.

Claims (1)

Claim $ A method of obtaining artificial rutile from enriched nanotech-containing titanomagnetite processing products by reducing and separating iron θ, including treating the initial titanium-containing product with hydrochloric acid, washing the solid product separated from the liquid with acidified water, calcining, characterized in that, in order to increase the yield of titanium in the target product and simplifying the process, the titanium-containing product is treated with hydrochloric acid of 12-18X-th concentration at T: W 1: 8-10, and the solid 'product immediately after washing is additionally processed atyut 3-5X ny solution of sodium hydroxide at T: W = = 1: 4-6.