SU108917A1 - A method of processing nepheline concentrate on alumina and caustic alkali - Google Patents

Description

A distinctive feature of the proposed method is the treatment of nepheline concentrate with a solution of an intact autoclave at a temperature not lower than 230 ° in the presence of lime, in order to obtain aluminate solutions.

According to the proposed method, autoclave decomposition of nepheline is carried out by pulping solution 1 1 in the presence of calcium oxide, resulting in the formation of solid aqueous matrix calcium silicate, and by releasing alumina from the solution, it will form an aluminate solution according to the scheme:

(Na.KjzOAlaOapSiOa --- pCaO + nepheline

4- xNaOH + уНзО, К) А1, + (х - т) NaOH + alumina solution

(y-K) Noo + + mNa2O pSaO pSiO. Kn.O

t hard sediment

Excerptal in laboratory instruments. Manuals and stats.

An almost complete transition of alumina to a solution (at a level of 92-95 o) requires the following relevant conditions for the leaching process:

1.Prod.tzhite.chnost vttce.tachi1 ai11YA about 10 minutes.

2. The pressure is 25-40 atm. which corresponds to TeNuie) aType 230-- 250

3.Molar oTiiouieHHe

Ha / 9.

AUO: i

4..1 of this type

Cao

SiOo

5. The conference center Ilochn 300-450 g 1.1.

Oxide ka.tstsi. introduced in the process izhelachivan 11 pepelline, contributes once; 1o1P11 () nef.tpn ;. Practically acceptable obstetting of alumina-rich solutions, bonding silica.

The precipitate of aqueous sodium silicate, silicate obtained after crystallization of nepheline, drank crystalline structures) separates the fritration of the organic substance by the coronary; otstaplUIHHC .VI. By reprocessing the precipitate is lime with MIJ.TOKO. contains in the sediment she.chochek passes 15 solution, replaces with oxide ki;) chi according to the scheme: mNa.O pSaO pSiO, Ki bO sediment and after 1st P, s1 celachine 15 + CaO + H, () p (2Ca (2 SK2. -.O) land; Ia t - 2niNaO l + H,. () T.tochi ()) When you go through it, and) Noah processing for 1 hour and give 10-12 agm, which is ) 120-200, practically I; CH or alobum is transferred solution. On the basis of irovedeynyi experimental work of autoclave refining and fine treatment, followed by treatment of the resulting sediment limestone, as well as the extraction of oxide of aluminum from spent aluminumate solutions, it can be proposed to proceed. processing nepheline. The nepheline concentrate mixed with potassium oxide is heated in autoclaves with recycled Ileloch solution (with a small amount of alumina), obtained after separation crystallized into the solid Ileum aluminate. The precipitate of aqueous sodium-calcium silicate is separated from the aluminate solution by filtration or sedimentation, washed and re-treated with lime milk to extract alkalis. After reprocessing, the sludge, which is obtained mainly from the aqueous dicalcium 1, silicic acid, is separated from the scum, washed and serves as a raw material for extracting the cement. Aluminate solution, obtained by leaching nepheline in an autoclave, as well as luxMi washings before coititration - 500 g / .1 Na /) and applied by a pair of solid, alkali aluminate of composition (Na, K) 2O А12Оз -2.5H2O. Crystallized carbon dioxide from the mother liquor with a caustic molar HVOC3 paiiHbiM 25-40 molar caustic ratio, which is then directed to the melting point of the process, dissolves to the washing water, and the resulting alkali liquor is discharged into the cistern of the process, dissolves into the washing water, and the resulting alkali liquor is discharged into the molten water of the process, dissolves into the washing water, and the resulting alkali liquor is discharged into the cistern. oTHOHJcimeM 1,4--1,6 irerabotyvaetch-s, similar to the Bayer method, in the processing of bokento, i.e., is taken into account with the release of chyumium oxide in the solid phase, which is then otech, washed, and calcined). The uterine solution is the separation of alumina hydrate with caustic. A ratio of 3.5–4.0 also comes from the evaporation and crystallization of the cymipata I1, herpes. After crystallization of aluminate E with a concentration of 640 g / -} NaOH and 18-22 g / l HOCO, the HacTii uterine P1, 18-22 g / l, is removed from the process as a commercial alkaline solution, and the remainder with 15% crystallized aluminum)) (in the form of aluminate pulp ) enters the process of crista. 1 of the aluminate pacTisors, and the results of nepheline cleavage, and serves as seed for the intensification of this process. The hydrothermal waters of the washing of the production hydrate are directed to the dissolution of alkali aluminate. The scheme outlined above is completely closed and consists only of hydrochemical operations (with the exception of alumina calcination). As a result of this treatment, three products can be obtained: ground oil, concentrated healing solution, which can be used in the city and the earth industry, and cement slurry. Extraction of chain jomonepes - alumina and H1, woods - can be provided in quality 90%.