Method of extracting rare-earth metals from phosphogypsum. RU patent 2491362.

FIELD: chemistry.

SUBSTANCE: method includes leaching of rare-earth metals (REM) from phosphogypsum with 1-5% solution of sulphuric acid, REM sorption from leaching solution with cationite, REM desorption, precipitation of REM concentrate from desorbate, obtaining REM concentrate and mother liquor, which is used for REM desorption. Cationite after desorption is returned at sorption stage. Phosphor and fluorine are precipitated from mother liquor, phosphor -and fluorine-containing sediment are filtered and filtrate is used as return water in leaching. REM leaching and sorption are carried out simultaneously. Obtained pulp is filtered through mesh filter with separation of saturated REM cationite. After that, pulp is filtered with obtaining non-dissoluble residue and mother liquor of sorption. Before desorption cationite is treated with part of desorbate.

EFFECT: simplification of technology, reduction of duration of REM leaching and sorption, increased efficiency of sorption and desorption and concentrate quality.

12 cl, 1 dwg, 3 ex

The invention relates to the chemical industry, namely to the technologies of phosphogypsum processing.

An important potential source of raw rare metals - lanthanides and yttrium (hereinafter REE) is phosphogypsum waste processing sulphuric mineral fertilizers Khibiny Apatite concentrate. As is known from the sources mentioned below, phosphogypsum is presented in the form (PPG) and (FDG). REM in figs are mostly in the form of microcrystals of hydrated phosphates (REM), RO 4 ·mon 2, associated with the SrSO 4 (Celestine), i.e. not isomorphic with 2CaSO 4 ·H 2 o Relatively effective sulphuric-acid-leaching of REM of figs is possible only after at least 1-2 months of storage (aging). This is explained by the passage of a considerable part of REE phosphates in fluorides, characterized by a high solubility in sulfuric acid solutions with formation of complexes (REM)SO 4 F, as a result of hydrolysis reactions contained in , in particular sodium:

Na 2 SiF 6 +2H 2 O→SiO 2 +2NaF+4HF

and interaction received hydrofluoric acid with REE phosphates

(REM), RO 4 ·nH 2 O+3HF=(REM)F 3 +N 3 RO 4 +2 o mon

In unlike FPG the main part of the REM (of > 70%) in the FDG isomorphic with plaster SO 4 ·2H 2 O, replacing it together with Na + ions (K + ) ions Ca2+ , in particular:

2CaSO 4 +(REM) 3+ +Na + →(REM)Na(SO 4 ) 2 +2Ca 2+ .

Some part of REM, especially in the FDG, is, apparently, in the form of hydrated double sulfate Na(REM)(SO 4 ) 2 ·N 2 O. In contains as water-soluble phosphorus, in a form which is in the moisture of phosphoric acid and insoluble phosphorus in the form of unreacted sulfuric acid Apatite and phosphates, as well as anions MIT 4 2 - isomorphically in CaSO 4 sulfate anions.

Know how to extract the lanthanides from phosphogypsum by leaching of dissolved 0,5-1,0%of the time by solutions of sulfuric acid (see, Lebedev V.N., and others, Removing REE from phosphogypsum leaching methods. // Physical-chemical and technological problems of processing of raw materials of the Kola Peninsula. - St.Petersburg: Nauka, 1993. - P.56-60).

Significant disadvantages of this method are high W:T=(5-10):1 (ratio of the liquid and solid phases in the leaching) and correspondingly low (0,25-to 0.37 g/l) content of lanthanides in the productive solution at a relatively low ~32-43%extracting them from phosphogypsum. These technological parameters define a technical-economic inefficiency of the ways for practical use.

Know how to extract the REM of phosphogypsum (EN 2225892 C1, Lokshin .. and others, 20.03.2004), including sequential leaching REE of several servings of phosphogypsum working solution of 20-25%sulfuric acid at W:T=2-3 within 60 minutes, the separation of insoluble residue from a productive solution, the crystallization of concentrate of REM in the form of sulphate by bringing a productive solution to the state of the supersaturated rare earth rising in him concentration of sulphuric acid to >30% at a temperature of 20-80°C. Crystallization of sulphates REM spend preferably in the presence of the seed of them with W: T not more than 100 for 0.4-3 hours Removing the REM in concentrate is within 50-60%. Concentrate REM separate filtering from the uterine approximately 30%solution 804, one part of which is used for the decomposition of Apatite concentrate, and another after water dilution up to 20-25% H 2 SO 4 - in circulation for leaching REE of phosphogypsum.

Disadvantages of the method consists in the considerable number of technological operations leaching of REM, their increased duration. Know how to extract the REM of phosphogypsum (EN 2167105 C1, Lokshin .. and others, 20.05.2001), including their portion sulphuric-acid-leaching, Department of breeding solution from the solid phase and its repeated use for leaching new portions of phosphogypsum, water leaching of insoluble residue, using the washing solution leaching. The leaching of REM from the first portion of phosphogypsum produce 2-6%solution of sulfuric acid at W:T=2-3. Leaching of each subsequent portions of phosphogypsum concentration of sulphuric acid in solution increase the ratio. Solution leaching use at least three times, and the maximum concentration of a sulfuric acid in solution is 24%. Prior to leaching phosphogypsum is crushed to a particle size of particles 100 microns. This method allows to achieve 4-5 stages batch leaching average 32,65-38,68%of extraction of rare earth from phosphogypsum.

Disadvantages of the method are the multistage process of leaching of REM, the need for a sufficiently precise control and maintenance of) the required ratios, as well as relatively low removing the REM of phosphogypsum in the solution.

There is a method of extraction of rare earth elements of phosphogypsum (EN 2293781 C1, Lokshin .. and others, 20.02.2007), according to which phosphogypsum process solution of sulfuric acid with concentration from 22 to 30 wt.% when W:T=1,8-2,2 within 20-30 minutes with extraction of rare earth elements and sodium solution to prevent such duration of the process of spontaneous crystallization of rare earth elements from the leach solution to separate it from the insoluble residue. After the separation of insoluble residue in the solution increases the degree of supersaturation it for rare earth elements by ensuring the concentration of sodium in the range 0.4-1.2 g/l, using, mainly, sulfate or sodium carbonate.

Disadvantages of this method are the absence of a rational technical solutions for the exclusion of a significant loss of rare earth elements contained in the wet insoluble residue and preparation for disposal and accumulation of pollutants in products of the technological process.

A method of refining phosphogypsum - partially washed , consisting mostly of 2CaSO 4 ·H 2 O (see, Lokshin .., V.T. Kalinnikov Physico-chemical assessment and development of appropriate technologies for extraction of lanthanides from . // Creating the foundations of modern strategy of nature management in the Euro-Asian region. Apatity: KSC RAS, 2005, .250-269). Leaching of REM spend 26%-s ' solution of sulphuric acid in G:T=1,8-2,2 during 20-25 minutes the Resulting slurry, no more than 5 min filtered on a productive solution containing sulphates REM and insoluble residue.

From a productive solution crystallized double-earth metals and sulfates, sodium for 2 hours at ensuring the concentration of sodium in the range 0.4-1.2 g/l, with the help of Na 2 SO 4 (or Na 2 CO 3 ), or lanthanides, for example, cerium sulfate. The resulting crystals double sulfate NaLn(SO 4 ) 2 ·N 2 O as concentrate aff REM, separated by filtration of acid stock solution, & GE 98,3% of the volume of which is sent to the turnover on the stage of sulfuric acid leaching of REM, and 1.7% of the production of wet-process phosphoric acid (EPA).

Insoluble residue is washed with water filter and after neutralization limestone output in the blade, and the wash solution containing rare-earth metals, directed to the production of EPA. Further processing of concentrate double-earth metals and sulfates, sodium realized by means of their conversion into REE carbonates using soda, which regenerate.

The disadvantages of this method are the conclusion of the process in the production of wet-process phosphoric not less than 10% of leached REM with a wash water insoluble residue phosphogypsum and from 1.7% a productive solution that leads to a decrease in the degree of extraction of splitting of the earth metals in concentrate, and also the direction of insoluble residue not for recycling, and the blade.

There is a method of processing of waste, containing phosphorus and lanthanides (EN 2337879 C1, Lokshin .. and others, 10.11.2008). The method includes the leaching of phosphorus and rare metals and sulfuric acid solution (in particular, 22-30%-s ' solution of H 2 SO 4 during 20-25 minutes) with a satiated by productive leach solution and insoluble residue. Selection concentrate lanthanides from the leach solution is carried out by crystallization double sulfate lanthanides and sodium upon standing sulphate solution for at least 2 hours Control of the received stock solution crystallization spend with the value of the works of the content of phosphorus in the solution and gypsum sludge moisture. Cleaning the mother liquor from phosphorus is carried out by introducing titanium compounds (monohydrate titanylsulphate TiOSO 4 ·N 2 On dry or 60%solution in 34%sulfuric acid).

Disadvantages of this method are significant (not less than 10%) losses of rare earth metals, wet (20%) precipitation of gypsum (insoluble residue), expansion of the nomenclature of reagents used - titanium compounds, and their regeneration will require the cost of chemical reagents and additional equipment, complicate the process. In addition, the relatively high content of titanium in directed on stage leaching of uterine solution crystallization (0,67 g/l in terms of TiO 2 ) leads to unproductive consumption of titanium.

Know how to extract the REM of phosphogypsum (EN 2416654 C1, NV and others, 20.04.2011), including washing phosphorus from water carried in a closed cycle with its subsequent disposal by the passing of leaching solution through a layer of carbonate waste (chalk) and return (turnover) of the depletion phosphorus water in the washing cycle of phosphogypsum. From washed phosphogypsum lead leaching of rare-earth metals solutions of sulfuric acid at concentrations from 3 to 250 g/l in mode heap leaching. From the leach solution absorb rare earth metals cation exchanger, was stripped them with a solution of ammonium nitrate to produce commodity regenerate () and return reverse cycle leaching depleted in the rare earth metals sulfate mother solution sorption.

Disadvantages of this method are very low rate of water filtration at wash phosphogypsum from phosphorus leaching solutions through a layer of phosphogypsum equal 0,00036 cm/s (30 cm per day). It causes the () the duration of the specified processes, high (≥ 10) the ratio W:T, loss of rare earth metals from the waters washing phosphogypsum from phosphorus, which account for about 3% ( N.V., etc.. Recycling of solid waste phosphogypsum. // New approaches in chemical technology and practice of processes of sorption and extraction. Conference materials: Saint-Petersburg, 2011, P.80-83). These shortcomings significantly reduce the technical and economic indicators.

The closest to method is a method of processing of phosphogypsum in relation to the FDG and figs (see article Lokshin .., V.T. Kalinnikov, O.A. Extraction of rare earth elements of industrial products and industrial waste Khibiny Apatite concentrate. Tsvet. 2012. №3. P.75-80 - prototype). Way leaching REM by filtering 1-5%solutions of sulfuric acid through a layer of phosphogypsum with production of leach solution and insoluble residue («purified phosphogypsum»). Insoluble residue neutralize (in particular, by SASO 3 ) and in the form of plaster sent for recycling.

From the leach solution, which contains, except REM and a number of impurities (including phosphorus, fluorine, sodium) remove the REM by sorption on in the N + - or NH 4 + forms.

With saturated cation produce desorption REM solutions of ammonium sulphate with obtaining with a concentration of REM, reaching 5 g/l in terms of aff (REM) 2 Of 3 . From precipitated by NH 4 OH or ammonium carbonate concentrates in the form respectively (REM)(HE) 3 or (REM) 2 (3 ) 3 . The content of oxides of REM in dried concentrate exceeds 40%. Resulting in the deposition of REM concentrates solution of ammonium sulfate can be reused for desorption of REM.

Accumulating in sulfuric mother solution sorption REM phosphorus and fluorine is removed from the process by means of their deposition in the form of low-soluble compounds. After filtering received rainfall is recycled, and the aqueous phase (filtrate) - the turnover on the stage leaching of REM.

Prototype method has several disadvantages:

1. Significant () the duration of the leaching process, REM, due to a very low speed of filtration (seepage) sulfate solutions through a layer of phosphogypsum. So, the speed of filtering solution through a layer of phosphogypsum thickness of 1.5 m was just 1.25 m to 1 m per day (rational duration of the leaching process not specified). However, it should be noted that according to the above-mentioned Art. N.V. with co-authors, the linear speed of filtration sulfuric acid solution (pH=1,0-1,1) through the layer of phosphogypsum was only 0,00036 cm/s or > 0.3 m/day. Thus, as it follows from table 3 of article leaching of REM filtering mode sulphate solution through a layer of phosphogypsum, removing the REM is about 30% with regard to G:T=3. Leaching the same about 40% REE required already a significant ratio W:T, equal ~5,5.

2. The need to use large earth's surface for sites filtration (, heap) leaching of REM, given the very low specific filtering ability of phosphogypsum, and therefore are small in height of its layer. There is a complexity of phosphogypsum stacking on the site leaching, especially stored in dumps, as well as neutralization of insoluble residue (gypsum), in particular, limestone before disposing of it.

3. Adsorbed cation exchange resin together with REM calcium, iron, aluminium and other cations impurities, turning when desorption in , reduce the quality of the concentrate of REM. Desorption of REM solutions containing only salt mineral acids, prevents the extent necessary to remove from the phase of cation exchanger was formed in it precipitation of phosphate-earth metals and impurities, which reduces desorption of REM and cation exchanger cleaning from impurities.

The invention is directed to eliminate these drawbacks and increasing the efficiency of extraction of rare earth from phosphogypsum.

Method for processing of phosphogypsum includes leaching REE of raw materials 1-5%solution of sulfuric acid to obtain the leach solution, containing rare-earth metals, phosphorus and fluorine, calcium, aluminum, iron and other impurities, sorption REM from the leach solution cation exchange resin followed by a busy REM cation from the mother liquor adsorption, desorption REE of cation exchanger a solution of a known method with obtaining , deposition of concentrate of REM, the division obtained pulp filtration at concentrate REM and the mother solution, which is used for desorption of REM, return after cation exchanger desorption REM stage of adsorption, precipitation of phosphorus, fluorine and other impurities from the mother liquor sorption REM, filtering formed the pulp with the receipt of phosphorus and fluoro sediment and leachate, which is used as cooling water.

The method can be characterized by the fact that the leaching of REM of phosphogypsum and sorption of leach solution is conducted at s:l=1:(2-3), and the fact that the leaching of REM of phosphogypsum and sorption of leach solution is conducted at a concentration of sulphuric acid leaching solution equal to 2-3%.

The method can be characterized, in addition, the fact that the leaching of REM of phosphogypsum and sorption of leach solution are within minutes 60-300

The method can be characterized by the fact that the leaching of REM of phosphogypsum and sorption of leach solution is conducted at movement of the pulp and cation in the cascade of apparatus fitted with mesh filter for the Department of cation from pulp when the specified number of cation in the apparatus, and also the fact that the leaching of REM of phosphogypsum and sorption of leach solution lead when loading cation exchanger in the amount of 0.5-5.0% of the volume of pulp in the machine.

The method can be characterised by the fact that as a vehicle for use reactor type «», as cation use gel structures brand KU-2-8h or its analogues, preferably in H + or NH 4 + forms. For processing a busy REE cation using a 0.3-0.5 volume . As the salt of sulfuric acid ammonium sulfate is used.

The method can be characterized by the fact that, in the deposition of concentrate of REM of the use of substances, selected from the group consisting of ammonia, ammonia water, carbonic acid ammonium salt or alkali metals or their compounds.

The method can be characterised by the fact that the deposition of phosphorus and fluorine the mother liquor sorption REM are the main compound of calcium at pH value is equal to or higher (5.5 and preferably air stirring, and besides, the fact that as the primary connection calcium use limestone or quicklime or slaked lime, or their mixture.

The technical result of the way is to simplify technologies of phosphogypsum processing, reduction in the duration of leaching and adsorption of REM, improving the efficiency of cation-exchange processes of sorption and desorption, and concentrate grade aff REM ensuring rational degree of extraction of rare earth from phosphogypsum.

In the drawing a diagram of technological process of processing on method.

The method is as follows.

Cross-pit spreader phosphogypsum mixed with 1-5% solution of sulfuric acid. In the resulting slurry type cation and implement formed by mixing of the mixture for several hours at room temperature. When this occurs simultaneous leaching of REM in leaching solution (aqueous phase pulp) and cation-exchange sorption from him REM. It is advisable to use reactor type «». Together with REM in leaching solution (the aqueous phase of the pulp passes a number of accompanying impurities (R, F, Al, Fe, and others), of which phosphorus and fluorine are when disposing of insoluble residue (gypsum).

At the end joint of sulfuric acid leaching and cation-exchange sorption cation is separated from the uterine pulp to mesh filter, then filtered pulp to obtain the insoluble residue (gypsum) and the mother liquor sorption.

Wet insoluble residue is treated the major interconnection calcium, preferably limestone, for its subsequent disposal in a known way. Mother solution sorption clear of phosphorus, fluorine and other related impurities (Al, Fe, and others) by processing a major interconnection calcium to pH sankhobe 5,8 with their transfer into the residue at a level of cleaning within 75-90%.

Processing of the mother liquor sorption of lead in air stirring, for the specified pH oxygen to oxidize the main amount of ferrous iron in the trivalent and highlight it in sediment. From the resulting pulp allocate sediment filtering for proper disposal in a known way. Purified mother liquor is used as cooling water.

Saturated rare-earth metals cation before desorption from him REM process the part of to REM cationite with simultaneous desorption (preemptive) adsorbed impurities (CA, Al, and others). This enables subsequent desorption increase in concentration of REM and reduce the concentration of impurities therein, which leads to improvement of the quality of the concentrate of REM. Desorption of REM with cationite exercise method known solution (containing a salt mineral acid), preferably at a temperature of 50-60°N

Mother solution after cation exchanger is used at the stage of joint sulfuric acid leaching and adsorption of REM and/or to prepare Stripping solution.

The achievement of the technical justified the examples below.

Removing the REM in cation of phosphogypsum is about 59%. Together with REM in leaching solution (the aqueous phase of the pulp passes a number of accompanying impurities (R, F, Al, Fe, and others), of which phosphorus and fluorine are when disposing of insoluble residue (gypsum).

At the end joint of sulfuric acid leaching and cation-exchange sorption REM is separated from the pulp to mesh filter cation, rich REM to approximately 74 g/kg (33 g/l), then filtered pulp to obtain the insoluble residue (gypsum) and the mother liquor sorption concentration of REM 9 mg/L.

Insoluble residue, having humidity approximately 23 percent and contains 0,34% p 2 0 5, 0,12% F process limestone to pH sankhobe 5.5 for its subsequent disposal in a known way.

Mother solution sorption clear of phosphorus, fluorine and other related impurities (Al, Fe, and others), by processing it with lime to pH sankhobe 5,8 with their transfer into the residue at a level of cleaning within 75-90%.

Processing of the mother liquor sorption of lead in air stirring. This allows the specified pH oxygen to oxidize the main amount of ferrous iron in the trivalent and highlight it in sediment. From the resulting pulp allocate sediment filtering for proper disposal in a known way, and the cleaned mother solution for use as recycled water for making pulp of phosphogypsum and/or source sulphate solution.

Saturated rare-earth metals cation before desorption from him REM process the part of , component 0,3 its volume containing 11.4 g/l aff REM to cation-earth metals with simultaneous desorption (preemptive) adsorbed impurities (CA, Al, and others). This enables subsequent desorption REM increase in concentration of REM and reduce the concentration of impurities therein, which leads to improvement of the quality of the concentrate of REM.

Mother solution after cation exchanger is used for sulphuric acid leaching and/or preparation of Stripping solution.

Of cation exchanger, REM to approximately 103 g/kg, was stripped them by processing cation exchanger, preferably at a temperature of ~50-60°With solution in the amount of 60 cm 3 , containing about 200 g/l ammonium sulfate, which add sulfuric acid until the concentration of 30 g/l The volume ratio of cation: solution is 1:4, which provides concentration of REM in about 11 g/l (subject to the partial transition of REM in in the form of dispersions double sulphates).

cation-earth metals and their desorption of conduct (in columns) in ascending mode filtering respectively and Stripping solution through a compacted layer of cation.

Part - 0,3 its volume (18 cm 3 ) - should be directed to the stage REM cation of the remaining volume of 0,7 (42 cm 3 ) precipitated concentrate REM using, in particular, ammonia. The content of the splitting of the earth metals in concentrate is after washing and drying of about 62%.

Example 2. The process is conducted in accordance with the terms of example 1.

The difference is that the ratio of the s:l=1: 2, the concentration of sulfuric acid in solution is about 5%, and the duration of the joint leaching and adsorption REM by mixing the sulphuric pulp phosphogypsum with 15 cm (about 7 g) cation is 60 minutes

At the end of the process of joint leaching and adsorption REM receive cation, and mother liquor from pulp to the content of the splitting of the REM respectively 73,4 g/kg 0.012 g/L. In the insoluble residue contains 0,35% P 2 O 5 and 0.10% F. Removing the splitting of the REM of phosphogypsum equal 58,4%.

The rare earth content in equal to approximately 102 g/L. the Content of REM in is 11.4 g/l and in concentrate of 60.3%.

Example 3. The process is conducted in accordance with the terms of example 1.

The difference is that concentration of a sulfuric acid in solution is approximately 1%, and for cation REM use 0,4 volume .

At the end of the process of joint leaching and adsorption REM receive cation and mother liquor from pulp to the content of the splitting of the REM respectively: AC 71.5 kg and 0.008 g/L. In the insoluble residue contains ~0,41% P 2 O 5 and 0.14% F.

Removing the splitting of the REM of phosphogypsum in concentrate is about 57%. The rare earth content in is about 116 g/kg

The content of the splitting of the REM in 13.1 g/l and in concentrate ~64%.

From the above examples, a patentable method ensures the achievement of a technical result and allows:

- To increase the extraction of rare earth from phosphogypsum by implementation of the leaching process from the pulp through more effective (intensive) its agitation in contrast to the long percolation (filtration) solution through layer (heap) phosphogypsum, which is characterized by the channeling of the solution and sulphates REM.

- Simplify the process of retrieving REE of phosphogypsum due to joint carrying out of leaching and adsorption of REM. This also improves the workability of the output from the process of insoluble residue with filter compared with removing it after percolation (heap leaching).

- In addition, the joint leaching and sorption REE can accelerate the process of transition REE of phosphogypsum in the solution due to their sorption and shift, thus, the equilibrium of the reaction towards the formation of compounds of rare-earth metals, contained in .

- By cation REM (oust) the appropriate number of impurities and thus improve not only the rare earth content in the product , but also improve the quality of the concentrate splitting of the REM.

1. Method for processing of phosphogypsum, including rare earth metals leaching (REE) of phosphogypsum from 1-5%solution of sulfuric acid to obtain a solution leaching, sorption REM from the leach solution cation exchange resin followed by a busy REM cation from the mother liquor adsorption, desorption REE of cation exchanger solution with obtaining , deposition of production of REM concentrate, separation of the obtained pulp filtering with obtaining concentrate of REM and the mother liquor, which is used for desorption of REM, return after cation exchanger desorption REM stage of adsorption, precipitation of phosphorus and fluorine from the mother liquor sorption of REM, filtering formed the pulp obtaining of phosphorus and fluoro sediment and leachate, which is used as recycled water PA stage leaching, characterized in that the leaching of REM of phosphogypsum and sorption of leach solution are jointly by mixing cationite with pulp, formed by the mixing of phosphogypsum with a solution of sulfuric acid, after which the slurry is filtered through a strainer with the Department of saturated REM cation exchanger, then filtered pulp to obtain the insoluble residue and the mother liquor sorption, and before desorption rich REM REM cation process part .

2. The method according to claim 1, characterized in that the leaching of REM of phosphogypsum and sorption of leach solution is conducted at s:l=1:(2-3).

3. The method according to claim 1, characterized in that the leaching of REM and sorption of leach solution is conducted at a concentration of sulphuric acid leaching solution equal to 1-3%.

4. The method according to claim 1, characterized in that the leaching of REM of phosphogypsum and sorption of leach solution are within minutes 60-300

5. The method according to claim 1, characterized in that the leaching of REM of phosphogypsum and sorption of leach solution is conducted at movement pulp and cation in the cascade of apparatus fitted with mesh filter for the Department of cation from pulp when the specified number of cation in the machine.

6. The method according to claim 5, wherein the leaching of REM of phosphogypsum and sorption of leach solution lead when loading cation exchanger in the amount of 0.5-5.0% of the volume of pulp in the machine.

7. Method according to claim 5 or 6, characterized in that in an apparatus used reactor type «».

8. The method according to claim 1, characterized in that in the capacity of cation exchanger use gel structures brand KU-2-8h or its analogues, preferably in H + or NH 4 + forms.

9. The method according to claim 1, characterized in that for treatment of saturated REE cation using a 0.3-0.5 volume .

10. The method according to claim 1, characterized in that in the deposition of concentrate of REM of the use of substances, selected from the group consisting of ammonia, ammonia water, carbonic acid ammonium salt or alkali metals or their compounds.

11. The method according to claim 1, characterized in that the deposition of phosphorus and fluorine from the mother liquor sorption REM lead compound of calcium at pH value equal to or greater than 5,5, and preferably with the air stirring.

12. The method according to claim 11, wherein in the capacity of calcium use limestone or quicklime or slaked lime, or their mixture.