BE384231A - - Google Patents

Description

       

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 x:,. 3 '. "; lIOïud, A LN'; AT THE CONCLITTRATION OF j, ÁTUR; ';; S .EII08PHATEEb.
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 l ': Ll1V'; ': Jt: 0n f, SC 1.',:. L3ti vs at the concentration of phosphate t, lens this memo, it is illustrated in its application bzz a rock known as of roohe léness (-e it state -the fine division or brought by grinding in this state> A rock of 02 butter often contains a Slavic percentage of bone phosphate, which is the desirable element in
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 a raw phosphate fertilizer, but it contains
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 eg91 ': 1J1C> llt usually, from 4 to 6 7 or more oxide of iron and aluminum, under forile of 8 - :, 18 or of opposite u-brgs whose effect is extremely harmful! 1.

   These compounds often cause the reversion of the jD08hDtS from the usable iorae to the insoluble form, which reduces the flow of the fertilizer. They determine eljaloJ..R1H vnA condition f, Y sicue of the super-phosphate produced,
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 has 1 help of the rock, the tendency of which is; to make it wet
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 <'1 of iterated d' 6 <JU and d l'Jpj). 'W'1tloU plus iiifioile as ferti-
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 reading.

   These unwanted substances, which contain iron

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 and aluminum, increase 1'3 consumption of Gid9, 0t and the same and, or products that have fO1'Ü, G1H in solution, act as a diluent to reduce the effective content. - ve in free phosphoric acid of the liquor which is later
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 It is commonly used for the addition of new amounts of phosphate rock in the manufacture of multiple superphosphate.



  These substances also form important compounds which are difficult to separate by filtration in the preparation of trisodium phosphate and disodium phosphate. In addition,
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 the gelatinous precipitate formed by these substances retains marked amounts of phosphoric acid, removing it from solution and reducing the yield of desirable compounds.

   
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 In accordance with the invention, the amount of iron and aluminum compounds present can be significantly reduced as the phosphate material is concentrated, so that the resulting material will be richer in bone lime phosphate. If these results are obtained, the phosphate maniera is treated with a sulphide, such as sodium sulphide or hydrogen sulphide gas, and the material treated with the
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 sulphide is concentrated for example 'by desohlarmaa or by foamy island to separate the unwanted minerals.
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 It has been found that a quaztity of 991 dm3 of hydrogen sulfide gas per ton of dry phosphate material gives satisfactory treatment.



   In certain cases, the best results have been obtained when the hydrogen sulphide is sent to a pulp containing an addition of metal salt capable of forming an insoluble sulphide, such as for example copper sulphate.



   The following examples illustrate various features of the invention as carried out under the conditions indicated.



  EXAMPLE I. of
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 Roohe / f6UeSaae containing phosphate is ama-

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 born by grinding to the state of pulp and the pulp is thickened in a Dorr bola thickener The flow of the thickener is sent to a Dorr bowl classifier, the overflow of which goes to waste. 'a pulp of which 50% is formed of water and the remainder of rock.



  Hydrogen sulfide is sent through this pulp by a long tube opening very deep into the pulp. After this treatment, the contents of the machine are sent to a dredge olassifier with the addition of water, giving, as a finished product, the discharge of the classifier sands. The results are shown in the table below in which the letters PCO denote bone lime phosphate, and Fe2O3 and A1203 denote respectively iron and aluminum oxides, the amounts being indicated in percent.
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<tb>



  PCO% <SEP> Fe2O3 <SEP> and <SEP> Al2O3%
<tb>
<tb>
<tb>, Food
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<tb>
<tb> Battery <SEP> thickeners
<tb>
<tb>
<tb> Dorr <SEP> - Flow <SEP> 74, SI <SEP> 4.78
<tb>
<tb>
<tb>
<tb>
<tb> Bowl <SEP> Dorr
<tb>
<tb>
<tb> discharge <SEP> rableurs <SEP> 76.80 <SEP> 3.60
<tb>
<tb>
<tb>
<tb>
<tb> Classifier <SEP> to <SEP> dredge
<tb>
<tb>
<tb> to <SEP> current <SEP> lower
<tb>
<tb>
<tb> discharge <SEP> rableurs <SEP> 8005 <SEP> 3.45
<tb>
 
The bone lime phosphate content is thus appreciably increased in the final discharge of the dredge oiler, while the proportion of iron oxide and aluminum is significantly reduced.



  EXEMPLN II
Another part of the flow from the same Dorr thickener is sent to the Dorr bowl classifier from which the overflow is discarded, and the discharge from the grinders is treated with hydrogen sulphide as previously described in a flotation device. Minerals Separation with agitation.



  Without removing the pulp from the machine, it is diluted by adding water and adding 136.2 grams of sodium oleate soap and 31.78 grams. of creosote oil, each time per ton of material introduced, an iron aluminum foam being

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 separate.
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  This foam contains a considerable proportion of the iron and aluminum of the initial whole. The pulp rut is deschlammed in a lower current dredge classifier, yielding C "llildc. concentrated product inal discharge of coxa:, nvnt 'b, i 2.> <phosphate of bone cnals and 3.25% of iron and aluminum oxides.



  EXAMPLE III.



   The flow of a Dorr thickener from an installation
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 Tenessee lation, resulting from the tr, i,:., nÛ of another p'ü'tie de rocha Tenessee is separated in a lower-current dredge cls8irict5ur, the excess of which is disposed of, and the discharge of rqblàurs is sent From the above-mentioned MD10r lys Separation machine under the pulp container containing <l1v 1 '.. <d) itiâ of its weight of water. The material is treated with hydrogen sulphide as described above: U0n. The treated pulp is then placed in a lower current dredger classifier, the overflow of which passes to the flaps.

   The target separator is processed into a pulp with an additional quantity of water in the Minorais Separation machine, stirred with 90% caustic soda granides. -, 272.4 ;; l '& ,, ... us of oleic acid and 1816 grams of fuel oil, each time per tonne of material introduced, and one separates a coucsntrd of LI 0 Lt ü- its .

   The results are shown in the table below
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 PCO% Fe20 and 2 3 '
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<tb> Food
<tb>
<tb> Battery <SEP> thickeners
<tb>
<tb> Dorr <SEP> - <SEP> flow <SEP> 71.54 <SEP> 5.80
<tb>
<tb>
<tb>
<tb> Unchorge <SEP> rableurs <SEP> from
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<tb> processing <SEP> at the first <SEP>
<tb>
<tb> classifier <SEP> to.

   <SEP> dredge <SEP> 74.47 <SEP> 4.85
<tb>
<tb>
<tb> Discharge <SEP> rableurs <SEP> from
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<tb> <SEP> processing at the second <SEP>
<tb>
 
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 Olasàificateux with dredger
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<tb> (after <SEP> processing <SEP> to <SEP> 1 '
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<tb> H2S) <SEP> 74.47 <SEP> 3.85
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 Flotation Conoenter 78/24 z 65

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It has been found that if the thick pulp is stored the night before after treatment with hydrogen sulphide, it does not provide equivalent results unless it has been well covered with water.



    EXAMPLE IV.



   A mixture of the coarse, or coarse-grained material known as classifier sand and the coarse or coarse-grained material known to be cone-choppable, separated in the water classification stages of a water treatment. Oonontrotion of crushed Phosphate rock from Tenessee is ground again in a mill until all the material passes through a 35 mesh sieve. The contents of the crusher are sent to an under-ventilated Minerals Separation testing machine, using as little water as possible. This pulp is stirred for one minute with further addition of 36.32 grams of hydrochloric acid and 204.3 grams of copper sulfate, each time per tonne of dry matter.

   Hydrogen sulfide is then passed through the pulp through the air inlet of the testing machine until the pulp is black. This condition required less than 991 dm3 of hydrogen sulfide ( HS) per ton, 45.4 grams of snvon powder and 227 grams of crude pine tar oil are then added, each time per ton of dry looms; the pulp is diluted and agitated to produce a preliminary or reject foam relatively rich in iron and aluminum and insolubles which is separated as long as any solid material is entrained.

   The remaining pulp is deprived of water, pulped with fresh water and stirred again in the same machine with the addition of 227 grams of caustic soda, 272.4 grams of oleic acid and 2043 grams of fuel oil, each time per ton of dry feed, to give a foamy phosphate concentrate and residue. The concentrate thus obtained is returned to the machine and stirred again to give a finished concentrate and an average product.

   The results are shown in the table below.

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 weight 10 PO 0 F'3p <L a t In ,, :, olubL; 3 '1 "A12 {)" o IV Power supply 100 71.09 4.66 9i 29
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<tb> Concentrate <SEP> -), <SEP> o
<tb> sparkling <SEP> 18.01 <SEP> 50.34 <SEP> 9.1 <SEP> 21.20
<tb>
<tb> First <SEP> residues <SEP> 81.99 <SEP> 75.17 <SEP> 4, <SEP> 1 <SEP> 8.47
<tb>
<tb> Concentrate <SEP> of
<tb> material <SEP> 58.13 <SEP> 78.78 <SEP> 3, - <SEP> 5 / eu
<tb>
 
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 .Product 8 93 74.66 4.35 z
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<tb> medium
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 Residues Il, 43 65.34 5.77 21.46
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 We will note from the preceding table lUt 1 ....: J:.: Itiè :: 'J;' vJctov finely, where residue contains a JUbst:

  A greater amount of iron compounds is aluminum than the phosphate concentrate. It therefore appears that the treatment with
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 hydrogen sulfide in the presence of copper salixoee not only results in a greater buoyancy of an appreciable part of the iron and aluminum, relative to the phosphate material, but also renders another appreciable quantity of compounds of iron and aluminum less potent than the desired phosphate material. In this way iron and aluminum compounds of two types or kinds were separated, one type or kind in a foam and another type or kind in the final residue.



  EXAMPLE V.



   Other part of the same material is subject
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 in substantially the same treatment and gave a slightly richer foam and reduced recovery, with some slight alteration in the conditions of the finished concentrate, including
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 as much 79.87% roo, equal to 43771 /, of the raw material.



  Further tests on different batches of phosphate material gave :; d, s parallel results. Sodium oleate solution has been found to give substantially the same results as soap powder. In dou-

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 By reducing the amount of copper sulphate, better results are obtained in the processing of lower quality materials.



    CLAIMS.


    

Claims (1)

1.- The process of concentrating a material containing phosphate, which consists in stirring a pulp of the material so as to mix it with a sulphide (for example sulphu- RESUME re of hydrogen) and to separate the compounds containing iron or aluminum of the mass of the material containing the phosphate, 2.- The process of concentrating a material containing phosphate, which. contains iron or aluminum compounds, which process consists in first sulphurizing said compounds by treating the material with a soluble sulphide (eg hydrogen sulphide) and then separating said compounds sulphides. 3. A method of concentrating a phosphate-containing material as claimed in claim 1 or claim 2, wherein the separation of compounds containing iron or aluminum from the material con-. holding phosphor is carried out by subjecting the material to concentration by foamy flotation, so as to recover in the foam compounds containing iron or aluminum. 4. A method of concentrating a material containing phosphate as claimed in claim 3, wherein the material contains phosphate remaining after separation of the compounds containing iron or aluminum. , is subjected to an additional operation of concentration (for example ooncentration by flotation) so as to increase the proportion contained therein of matter containing phosphate. 5.- A process of concentration of a material containing <Desc / Clms Page number 8> phosphate, as claimed in any one of the preceding claims, in which the pulp is stirred, before sulphurization, with a clean metal salt (eg copper sulphide) to give a sulphide insoluble when sulphurization is performed.