DD149614A1 - TECHNOLOGY TO IMPROVE THE QUALITY OF BOTH FLOTATIVE CHLORINE CHLORIDE EFFECT - Google Patents

Abstract

The invention relates to an extension of the flotation technology for the treatment of sylvin-containing potash. The aim of the invention is the modification of the technology in the flotation process to increase the final concentrate quality. The object of the invention was achieved by staggered power input into the basic flotation, by an increased power input into the cleaning flotation and above all by intensive agitation of the preconcentrate and / or intermediate concentrate. Application: For the potash crude salt processing.

Description

The treatment of potash salts is carried out either by the flotation technology or by the hot-dissolving crystallization technology. In part, both technologies are also used in combination. The flotation technology is mainly used for the preparation of sylvinites and sometimes also for hard salts with appropriate digestion ratios. It consists essentially of the following successive process steps comminution, flotation, dewatering and drying. The actual separation of the tfertstoffes (Sylvin) and the departures (halite, kieserite, insoluble u.a.) takes place in the flotation. The flotation process is generally subdivided into a basic flotation and into 2 or 3 purifying flotations of the preconcentrate which, in the basic flotation, are characterized by the use of ammonium salts as alkali metal salts

Collector for Sylvin is produced · The preconcentrate, ie the flotation foam passes directly from the Grundflotation in the 1st Eeinigungsflotation and from there also directly into the 2nd and 3 · Eeinigungsflotation · From the preconcentrate thereby the worthless components such as halite, kieserite, etc. are removed and a final concentrate prepared. In order to meet the international requirements for a salable product, this must have a Kp ⁰ content of at least 6o % , which is usually difficult with strongly intergrown potash salts and can not even be achieved by a three-stage e eution flotation The low selectivity is mainly due to a predominantly unselective flocculation of the fine KCl and NaGl particles, but an unselective amine adsorption on the finest halite and the flotation of the halite due to this can not be based on the current state of knowledge be completely excluded.

Internationally and partly also nationally, in order to win salable products (^ 60 % KpO), two procedures are used:

- Separation of the fine grain by mechanical Entsohlämmung before flotation (especially if the Kalirohsalz contains much insoluble) and recovery by a dissolution and crystallization process.

- Cleaning of the final concentrate by dissolving the halite with water or with KCl-containing or -saturated solutions ζ solvent water) ·

These two approaches have various disadvantages, such as increased water requirements and / or energy requirements. Furthermore, there are higher demands on equipment and / or on the performance of existing drainage systems.

d) Object of the invention

The aim of the present invention is to change the technology in the flotation process in order to increase the final concentrate quality achieved according to the previous procedure and to reduce or completely avoid the abovementioned disadvantages.

e) Presentation of the essence of the invention

Eies according to the invention by the following technological measures:

a) staggered power input in the basic flotation with the aim of increasing the pre-concentrate quality.

b) Increased power input in the cleaning flotation.

c) Introduction of intensive agitation (high power input) of the preconcentrate (flotation foam of the basic flotation) in thick suspension and, if necessary, the intermediate concentrates.

Wesenseigen is all three measures to improve the final concentrate quality, which can also be used in combination, that the turbulent stresses of the flakes and also the particle-bubble aggregates (agitation) by the increased power input compared to the actual state or by introducing an intense agitation in thick suspension the preconcentrate and the intermediate concentrates), which leads to a higher selectivity of the sorting process by removing the worthless constituents by destroying and / or transforming the flakes or particle-bubble aggregates therefrom.

All three measures mentioned above and also their combination with one another lead to an increase in the final concentrate quality with the same total material yield, with the highest selectivity being due to intensive agitation.

Increases are possible · Except for measure b), measures a) and c) and combinations a) and c) as well as a), b) and c) (under certain conditions, entry of performance in the cleaning floatation are not too high) Basic flotation by the Zwischenrückstandsinassen. The measure c) and the combination of a) and c) and a), b) and c) (under certain conditions - input in the cleaning flotation - 4oo % (based on 1 s criterion) even have the advantage that the Zwischenrückstandsmengen the The combination of a) and c) provides the greatest advantages both in terms of increase in selectivity and the relief of the basic floatation. With a suitable choice of the technological parameters, it is also possible to save a cleaning stage compared to the actual state, for example by very intense agitation or by a combination of a) and c).

The following exemplary embodiments are intended to demonstrate the effectiveness of the individual technological measures and their combinations. The experiments were carried out in laboratory flotation cells (4 and 8 1) of the Bergakademie Freiberg type with a sylvinitic crude salt (feed content about 15 % K ₂ O). The crude salt has an upper particle size of about 1 mm (= dg, -). The proportion less than 125 .um is about 1o - 15%. The basic flotation was followed by a two-stage cleaning. The flotation was carried out in a saline solution saturated with the constituents of the crude salt. For the flotation of sylvin, a reagent regime consisting of an alkylammonium chloride (CLg - СЦо) as a collector, kerosene as an additive and octandiol as a foamer was selected.

"- 5 -

The following symbols are used in the exemplary embodiments:

GF - basic flotation

RF - Cleaning Flotation

u - stirrer speed

O _n - Concentrate content

V - flotation cell volume

c_ - collector quantity

f - solids content

Я ·,., * ~ Total output

- Apply intermediate ⁽³ residual mass

Qt - specific air volume

Wl j tu *

P / P power entry in % (relative to the

1 second criterion) t - time

R ¹ - total output after the purification step (relative to the task)

Indices: A - agitation; F - flotation

The following shows the chronological order of the flotation:

- Base flotation: 0 ... 2. min Suspension of the solid and setting of the 1st power input

2nd min 1 · collector addition

2 · ... 3 · min Collector action 3 · ... lo.min Air supply and flotation (until foam is solids-free)

applies only Mo. min 2nd collector addition and

for the adjustment of the 2.

graduated J performance entry performance

10.5 mm acting on entry I

Mo, 5 min air supply and flotation

until foam solids-free - Reinigungsflctation:

1 · Agitation (t _A , n ^, f _A - depending on the experimental conditions) 2 · Air supply and flotation until foam is solids-free

The concentrate contents in the exemplary embodiments are given without solution (also called alkali-free).

f) Embodiment 1

Influence of a staggered performance input in the basic flotation on the final concentrate quality of a two-stage cleaning flotation

Experimental conditions: GF: V = 8 1 f = 5oo g / l Q _L = o, 45 m ^^ ¹ RF: V = 4 1 φ: 25o Q _L = o, 2 m ³ - 35o g / l

t _A = 1 min; п _д = n _p ; f _A cx 3oo g / l

Grundflotation ^c s2 g / t ^с с , 5 1. Cleaning Flotation 2. Cleaning flotation JZ- / JL C j% JtT / -ν / X Ί * S ST с. S OL er / + · 421/0 g / u / 0 Зо Зо 48 р »І / ρ" »p P'VP'g c _c R « _cg + 1oo 6o 1oo боо бо 1oo боо 63ο 65o 57.5 8o, 5 65o 58.3 83.5

(see also embodiment 4) + possible actual state, i. without action according to the invention «

Embodiment 2

Influence of the contribution of power in the eeinigungsflotation

Test conditions:

GF: V = 8 1 RF: V =

= 1oo % C ^ = o, 45 m ³ m ~ \ in ~ ¹

c _s = 9o g / tf = 5oo g / l

= o, 2

min

min '' ¹

35o g / l

Grundflo- 1. Reinigungsflotation tation

2. Cleaning Flotation

cg

cg

cg

48.5 92.9 1oo 55.6 83.6

+ 48.2 92.6 4oo 56.4 75.8 46.8 92.2 7oo 56.9 63.5

1oo 57.3 81.2 44 o 58.3 73.3 84 o 59, o 59.2

+ see embodiment 1

Embodiment 3

Influence of the agitation (speed and time) of the pre- and intermediate concentrate

Test conditions:

GF: as embodiment 2 RF: P "'/ P'" ^ 4oo % Q _L = o, 1 m

_L V = 4 1; f _F = 25o - 35o g / l

agitation * A ^f A Reason- ^R cg 1. Cleaning R'cg 2. Cleaning R'cg parameter min g / 1 flotation % flotation % flotation % ⁿ A 1 З00 с c 92.6 ^c c 75.8 ^c c 73.3 min " ¹ 8th 600 % 92.4 % 81.3 % 78.5 + 1120 8th 600 48.2 92.9 56.4 82.5 58.3 80.1 I8oo 2o 600 48.3 92.9 57.3 8o, 4 59.9 77.3 2ooo 2o 600 48.3 92.1 58.4 85.1 60.5 81.9 15oo 47.6 57.1 59.8 I800 47.4 58.4 61.0

+ without measure according to the invention

Embodiment 4

Influence of the combination of the technological measures shown in the embodiments 1 to 3

Test conditions: GF: V = 8 1%. - ° »5 mm -

f = 5oo g / l "

RP: V as 4 1 Q ₁ = o, 1 χα? Ш "^ fjr = 250 - 350 g / l

(Agitation of pre- and intermediate concentrate) For results see following table

Grundflotation ^c s1 g / t P "'/ Ρ'" στ / О g / t ^c c 2 agitation ⁿ A min * A -ІШІП ^f A g / l 1. Cleaning flotation ^c c ^R % ^CS 2 · Cleaning flotation 58 3 > 1o 17 π ZjXI pH '/ ρ "' TS 9o - - 48 ,1 ^to P 1 300 ρ! "/ p // i S VT / 0 56.4 75.8 pll / pin S 59 , 6 73.3 1o , 9 1oo 60 1oo 30 46 3 92.6 I800 8th 600 400 56.9 81.2 440 60 2 78.8 7 ,8th 1oo 60 400 30 51 , 5 93.3 I800 8th 600 400 58.3 82.9 44o 60 2 79.5 ⁹ 3 4oo 9o - - 92.3 I800 8th 600 400 57.6 82.5 44o 78.2 1oo 93.8 78О 85o

+ without measure according to the invention '

Claims (3)

1 · Technology for improving the final concentrate quality in flotative potassium chloride extraction from sylvin-containing potassium salts, characterized in that either by a staggered power input in the base floatation (positive influence on preconcentrate quality) or by increased power input in the cleaning floatation during flotation, or by intensive agitation of the preconcentrate and / or also the intermediate concentrates before the respective cleaning flotation, wherein the variant intensive agitation of the pre- and / or intermediate concentrate is to be given priority, the selectivity of the flotation process is improved. 2. A technology according to claim 1, characterized in that the said technological measures can also be used in combination in one another. 3 * technology according to claim 1, characterized in that the intensive agitation is achieved both by increasing the power input and the agitation time as well as by apparatus parameters or by combining these possibilities.