DE1508021A1 - Process and device for dephosphorization of iron ores - Google Patents

Description

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Poraco y Proyeotos S.A.

Process and device for dephosphorization of iron ores

The invention relates to a method for dephosphorization of iron ores.

It is well known that, among other classifications, the iron deposits can be divided into two large groups, viz the deposits with ores containing phosphorus and those with ores not containing phosphorus. Ores containing phosphorus have been in the iron and steel industry since the Thomas Process used · There is no doubt that the Phosphorus-containing ores have major sales difficulties on the ore market have bid and also; now still bid when they non-phosphorus ores

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This situation is more pronounced in certain countries than in others, the ironworks of which the male centers are already equipped for the treatment of ores containing phosphorus. These circumstances have led the notifying party to investigate the dephosphorization of the iron ores of the mines owned by it in the San Jose Mine Concession, Spain, the entirety of which can be regarded as belonging to the group of phosphorus ores and an amount between 0.3 and has a phosphorus content of $ 0.7.

It should be noted that the applicant for

their invention exclusively used ores from such deposits during the experiments and their effectiveness has established, so that it can be assumed that the invention is useful in an occurrence with a different stratification can be applied to ores coming from other mines.

The process has formed the subject of laboratory tests which have been going on for several years various samples have been carried out, and has been further trained in a sample facility. It sure is industrial Application of the method according to the invention is possible at the current stage of the investigations, although still further improvements can be made.

(Technical basics

In attempting to enable industrial ° rapid use of the process, the concept of economic

^ possibility taking into account the current situation

cx>. ·

\ Attempts directed. The tasks that have occurred can be divided into four

c £> chapters are divided into:

^ω downsizing of the ore

Attack by acidic solutions

Regeneration of draining fluids. Work process

Crushing the ore.

There was no interest, the ore one

Subject to pre-shredding, which is neither economical would have been possible up to a recent point in time at which a development in the processing of ores was involved low content, which involves concentration with subsequent agglomeration, sintering or transfer into small particles so that they could be used in the iron and steel industry as ores with high content in the form of pellets or fine particles can be used.

As is well known, the concentration requires the first step, the size reduction down to dimensions between 50 and 400 microns · The crushing to the specified Incidentally, dimensions are a form of ore processing that is generalized.

To the ore of a dephosphorization treatment

dimensions between 100 and 300 microns are used. The most suitable grain size is determined by the Parameters of the ore and determined by economic circumstances, and the dimension of 100 microns is always suitable in all cases for the method according to the invention *

Attack by acidic solutions

It is well known that for more than a century, phosphorus has been extracted from the phosphorus-containing or ores containing phosphate attacked with sulfuric acid especially the ore, the phosphorus-containing component of which is apatite or calcium phosphate. They tried

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Iron ores also contain apatite as an element containing phosphorus. . ·

From the experiments of the applicant it can be concluded that the dilute solutions of strong mineral acids and certain weak mineral acids, even if they are not the insoluble phosphate-containing component of the Dissolve apatite-forming calcium triphosphate molecule, decompose it with the production of calcium monophosphate, whereby the solubility guarantee ^ will. The following can be used for this reaction rough formula must be given!

Oa ₃ (PO ₄ J ₂ + H 2 SO _{4 2} - 2 SO ₄ + Oa Oa (H ₃ PO _{4) g}

Likewise, the attack can be with any other Acid, which can break down the calcium triphosphate molecule.

As for the iron ore, an attempt has been made to define the most favorable conditions, which of the three depend on the following parameters: time, concentration and grain size,

Above was a grain size in the order of magnitude

of 100 microns, but it can vary between 50 and 3.00 microns depending on the composition of the ore and the economics of the process. The concentration can also vary from one ore to another between limits, which can be set at around $ 0.05 and 1 #. Extremely favorable results were achieved with solutions of 0.5 ο when using sulfuric acid of 66 ° Be *.

The time parameter can range between a minimum of 10 hours and a maximum of 25 hours in puncture The grain size and the concentration of the solution vary. These time limits are sufficient for the use of acidic solutions

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Exercise of the procedure in the manner described below.

Regeneration of the drained liquids

If the iron ore containing phosphorus is treated under the above conditions with regard to grain size, the concentration of the solution and the duration, complete dephosphorization is obtained. The consumption of acid and water and the handling were as far as increase the cost price that any possible industrial use for economic reasons would be impossible if you do not that could for the treatment loading regenerate j used solutions because these solutions, the result of the low Lösliehkeitskoeffizienten Quickly saturate calcium derivatives and the well-known great passivity of very dilute solutions

As a result, the dephosphorization solutions cannot be reused and must be replaced or regenerated will.

The regeneration takes place by passing through the saturated solution through a cation exchanger with a hydrogen cycle. The technique of such regeneration is known per se and does not need to be explained in more detail here.

By using one or more exchangers as the case may be used, the exhausted solutions can be returned under conditions which allow the treatment with the same effectiveness as at the beginning, achieving the required savings in acid and water.

The polystyrene-based resins used in the exchangers must correspond to the composition of the

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used natural, water and the composition of the used solution to be chosen «

The consumption of acid, which forms the essential part of the economic balance, consists only in the inevitable losses during the regeneration of the resins.

The regeneration of the solutions by ion exchange with resins based on polystyrene can be represented by the following concentrated formula, in which R is the organic radical of the exchanger: Oa SO ₄ + 2 HS a Oa R ₂ + ■ SO ₄ H ₂

With regard to the conversion of the calcium tri

. apatite's phosphate in calcium monophosphate and calcium sulfate The resins act on the solutions in such a way that they release the calcium from the sulphate and produce sulfuric acid, and that they do too release the calcium of the monophosphate and generate phosphoric acid. This latter does not interfere with the process, since it disappears during washing, which the ore during its later Concentration is subjected, assuming that the monophosphate is not in the exhausted solutions as a result of a corresponding precipitation is retained in an ion exchanger or in the presence of lime in order to be produced later to be used by phosphates or phosphate derivatives.

^ The regeneration of the cationic resins leads to

co as stated earlier, to an inevitable loss, which ο can be reduced considerably in the pits in which

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^ the water of the tunnels, which have flowed through -P ₀ with sulphate-laden zones, have a strong acidity.

The invention is hereinafter referred to

explained on the drawing by way of example, the only part of which

"education schematize]! a system for the practice of the invention Procedure shows.

The system shown contains an ore bunker A, a conveyor belt for loading 0, a treatment tank B, an outlet valve G, a storage container H for the treatment solution, an ion exchanger R, a container I ..._ for_.the _ .. reÄenjBrierte__LösuELgj a motor pump unit F, a Büekführleitung P, a line E for collecting the solutions at the exit of the treatment, a line ΪΓ for the supply of the active Solutions to the treatment tank B, a device J for pumping natural water to the tank B, a tank D for the active regenerated solutions, and a pipe K / to dispense the water to facilitate the downward movement of the ore

X denotes the level of the ore and Z that

Level of solution.

The effectiveness and economy

are simultaneously assured by the indicated treatment process, which has been tested using the known screening systems, moving or solid pulp systems, and other systems commonly used for gold leaching by cyanation and other treatments of ores.
cp The system according to the invention differs from the

usual earlier practice and can rise as, -des Yer-

driving.

ο The one coming from the shredding device

^ Ore is stored in bunker A, from which it is carried through the conveyor belt O is fed to the cylindrical container B,

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the lower portion of which is frustoconical.

The active solutions come from the upper one. Container B in the to the lower section of the treatment container ere B leading line H. These solutions form a continuous ascending plus, which the ore grains without Risk of clogging. The correspondingly set Pressure is added to the capillary effects to determine homogeneous diffusion in the ore mass.

The solution slowly runs through tube E. over and emerges from the container B without any noticeable entrainment occurring due to the high density of the ore.

There is no loss of even the finest particles

a filter made of fiberglass, asbestos or any other product can be used in the flow circuit, which is not attacked by the acids.

The ones with calcium monophosphate and calcium sulfate

loaded solution exiting container B will be at the end of the pipe E is collected in the container H, which is connected to the ion exchanger R for the regeneration of the solutions, whereupon the solutions get into container I. The motor-pump unit F removes the solutions from the container I to them through the line P back into the output container D, from which the described circulation begins again .

The losses of water and acid are those

which from the evaporation, from the leaks and from the ores carried out by the ores emerging from the treatment tank ! come from moisture.

The lower frustoconical part of the handle 90S808 / 0923

Lungsbehälters B can easily by means of the valve G using the device J are emptied, which promotes the natural water with the required pressure in the Eohr K, whose The task is to regulate the escape of the ore in such a way that no constipation can occur.

The device described allows, when in use a corresponding pipeline network to put the number of treatment tanks in operation, which are used for dephosphorization of the desired volume is required.

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Claims (1)

Claim Process for the phosphorization of iron ores, characterized in that the ore is crushed into particles of about 50 to 500 microns, that these particles with acids, especially strong mineral acids in very dilute solutions (0.05 # to 2 ⁰ Pi in devices for straining with immobile or mobile pulps, especially in an ascending direction, are treated, and that finally the treatment solutions are regenerated by cation exchange 90 9 88 870 92