Processing method of potassium production wastes

FIELD: metallurgy.

SUBSTANCE: processing method of potassium production wastes involves stage hydrocyclonage of wastes in the form of slurry pulp with separation of preliminary concentrate and pulp of tail ends. Then, dehydration, preliminary drying, granulation and drying of preliminary concentrate is performed so that concentrate is obtained. With that, hydrocyclonage is performed in four stages on 10, 7, 5 and 5-degree hydrocyclones with pulp temperature of 4050C, under pressure of 35 atm at the ratio of unloading-to-drain head pieces, which is equal to (1.141.17):1. Granulate is dried at 150200C. After drying is completed, granulate is annealed at the temperature of 650950C so that roasted product is obtained. After preliminary concentrate is separated, pulp of tail ends is clarified, and thickened part is returned to the processing process to the first stage of hydrocyclonage.

EFFECT: maximum waste utilisation; final waste utilisation product can be used as complex fertiliser of prolonged action, which is ensured with peculiar features of its composition and the state gained during waste processing.

4 tbl

 

The invention relates to methods of processing (recycling) of the clay-salt waste (sludge) manufacturers K-Mg ore and rock salt by the methods of enrichment, with the further processing of bulk concentrate of ways pyrometallurgical processing.

A method of obtaining collective concentrate for extraction of precious metals in patent No. 2284221 (publ. 27.09.2006), including the three-stage gidrotsiklonirovaniya sludge with the release of the concentrate, and the gidrotsiklonirovaniya come sludge with respect to solid and liquid phases T:W=1:3, gidrotsiklonirovaniya is carried out sequentially in 10-, 7 - and 5-degree hydrocyclones, and collective concentrate of clay-salt waste manufacturers potassium-magnesium ore and rock salt, (for extraction of precious metals), is a mixture of sedimentary and floatated materials, which are insoluble in water balance (N.O.) sludge. Unloading of the hydrocyclones of the first and second stage will unite in the concentrate.

The drain of the second stage gidrotsiklonirovaniya in the form of a solution of salt and floatated part of the CONCENTRATION sludge is directed to the third stage gidrotsiklonirovaniya. Here through the drain nozzle is allocated floatated fraction with natural and man-made organic and subsequent Association with concentrates (what athroscopy) hydrocyclones first and second stage gidrotsiklonirovaniya and the formation of collective concentrate. Through the sand nozzle, at the third stage, comes the salt solution, which is the tails enrichment process, and recycle sludge gallerycheck and flotation plants with a high content of natural and anthropogenic organics.

The disadvantage of this method is that recycling is subjected to only a part of the waste generated in obtaining collective concentrate enrichment.

The method for extracting precious metals from mineral raw materials containing chlorides of alkali and alkaline earth metals in patent No. 2291907 (publ. 20.01.2007), including gloriouse roasting, leaching the calcine and sorption of noble metals, and gloriouse firing expose mineral raw materials containing 713% of the amount of chlorides of alkali and alkaline earth metals and spend it at t 600700C, the leaching of calcine are diluted solution of Aqua Regia, and sorption of noble metals from the resulting pulp. Moreover, when the content in the treated mineral raw materials chlorides more than 13% are shaded excess chlorides, thickening of the pulp and the direction of the condensed product after drying gloriouse firing.

The closest present invention to the technical nature of patent No. 2385772 "Method of production of bulk concentrate for extraction of precious metals" (publ. 10.4.2010), including the three-stage gidrotsiklonirovaniya sludge, with a ratio of diameters nasdaw unloading < discharge and release of the concentrate, which is a mixture of sedimentary and floatated material T:W=1:1, dewatering, drying, granulation, and concentrate absoluut to the salt content of 205%, granularit to the size of the granules with a diameter of 8 or 15 mm, dried to a moisture content of 0.5%.

The disadvantage of this method of waste disposal is a small part of the waste when producing collective concentrate enrichment and its further processing pyro - and hydrometallurgical methods for the recovery of precious metals.

The invention solves the problem to provide a method of waste processing enterprises, processing K-Mg ore and rock salt with maximum utilization.

The technical result is the creation of a method of waste processing enterprises, processing K-Mg ore and rock salt with maximum utilization.

This technical result is achieved by a method for processing waste potash production, includes gidrotsiklonirovaniya sludge emitting concentrate dewatering, drying, granulation, and, gidrotsiklonirovaniya is carried out in 4 stages, with the temperature of the slurry 4050C, pressure 35 ATM., when soo is wearing nozzles discharge: discharge to 1.141,17, drying of the granules occurs at 1150200C. Calcination of the pellets is carried out at 1650950C.

Distinctive features of the proposed method is that the gidrotsiklonirovaniya is carried out in 4 stages, with the temperature of the slurry 4050C, under a pressure of 3-5 bar., and the ratio of nozzle discharge: discharge is (1,141,17):1, drying the granules occurs at t 150200C, calcination of the pellets is carried out at 1650950C.

The proposed method of processing ensures maximum utilization of waste potash production, which is ensured by changing process parameters enrichment method gidrotsiklonirovaniya (ratio nozzles discharge: discharge, pressure feed pulp to the gidrotsiklonirovaniya), the change in temperature when hydrocycloning, filtering preconcentrate and inclusion in the recycling process glorieuses firing, which in the prototype no.

These changes of parameters yield a useful product (cinder) 80-95%. Pulp mill tailings, settles and is condensed portion is returned to the head of process at the first stage gidrotsiklonirovaniya to extract in bulk concentrate (sludge and potassium chlorides.

The final product of the recycling process - the candle is composed of properties, giving it a quality of complex fertilizer of prolonged action. This SL is blowing components: 1) nutrients (K, Sa); 2) trace elements (Fe, B, Cu, Zn, Mn), the content of which reaches 0,10,3%; 3) trace elements in lower concentrations (Co, Mo, Se) 0,001-0,0001%; 4) reclaiming components (anhydrite, dolomite).

The method is as follows. Sludge resultatives water to T:W of 1:2 to 1:2,5. Next, the pulp goes on gidrotsiklonirovaniya. The gidrotsiklonirovaniya cooked pulp is carried out in 4 stages on 10-, 7-, 5-, and 5-degree hydrocyclones. At the first stage gidrotsiklonirovaniya, pulp is fed at a temperature of 4050C, pressure 35 ATM. Table 1 shows the results gidrotsiklonirovaniya to obtain preconcentrate. The authors found that the optimal ratio nozzles discharge: discharge at all hydrocyclones is the following: (1,141,17):1. This ensures the output preconcentrate 8090% of the original pulp. The ratio of the chlorides of potassium and sodium in the recycling process changes. The ratio of the chlorides of potassium and sodium in the original sludge can range from 1:0.9 to 1:0.6mm. When hydrocycloning the ratio of the chlorides of potassium and sodium can vary depending on the temperature regime, keeping a larger share of chloride of potassium. In the feedstock, this value is KCl:NaCl=1:0,7 (table 2). Preconcentrate after gidrotsiklonirovaniya, with a water content of 30-40% is filtered in filter presses, and the temperature of the slurry 4050C. The resulting product is characterized by a moisture content of 18-25%. The product is then granulated and dried. In the granular concentrate enrichment) the ratio of chlorides of potassium and sodium is 1:0,31:0,4 (table 3).

In other words, the main purpose of the processes gidrotsiklonirovaniya and filtration is the removal of sludge sodium chloride and excess moisture with conversion of the material in the viscous mass is suitable for granulating and drying in a rotary kiln at t 150200C. the Granulation of the obtained product and the drying is completed the process of obtaining a concentrate enrichment, in the form of granules ready for further processing.

The technical essence of the removal of part of the NaCl in the tails when hydrocycloning and in the filtrate, and the subsequent filtering preconcentrate in filter presses, based on the difference in temperature coefficients of solubility of the chlorides of potassium and sodium in their joint presence, i.e. in the system KCl-NaCl-H2O". When the temperature rises from 2025C to 90100C all the chlorides of K and Na are dissolved. Upon cooling of this hot solution of 4050C it becomes supersaturated relative to the potassium chloride, which will crystallize, and the sodium chloride will remain in the solution (http://www.okade.ru/agrohimiva/855-proizvodstvo-kalivnyh-udobreniv-i-ih-svoystva-chast-l.html).

Therefore, after heating the slurry, followed by the cooling, applying for the gidrotsiklonirovaniya and then filtering, potassium chloride crystallizes and remains, respectively, in the unloading of hydrocyclones and cake after filtration, a solution of sodium chloride, respectively, goes to tails gidrotsiklonirovaniya and in the filtrate.

Next concentrate enrichment (granulate) is subjected to high temperature firing in calcining furnaces were at t 650950C, to obtain a calcine, and solid-phase transformation of the minerals constituting the granules thus obtained product (cinder) has all the properties of complex fertilizer of prolonged action.

The technical result of firing is to transform under the action of high temperature mineral composition the CONCENTRATION of the sludge. This firing is fundamentally different from gidrotsiklonirovaniya and filtering, where there is just the separation of minerals in processing products with the removal of parts of sodium chloride in the tails. If the granular concentrate enrichment) is the whole range of minerals, the CONCENTRATION of sludge in the calcine appear newly formed minerals (pyroxene, melilite, leucite) and almost disappears sodium chloride and potassium chloride remains, in this case the residual ratio of the chlorides of potassium and sodium may be 1:0,1 (table 4). In tables 2, 3 and 4 shows the mineral composition of dehydrated sludge granulate obtained from it God is CA.

The main property of candle - strong communication (adsorption) instant (sylvite) and sparingly soluble (anhydrite, gypsum) components, as well as distributed with the mineral matrix. In turn, this strong bond of useful components with the mineral matrix provides a lower solubility of these components when making candle into the soil as fertilizer.

In other words, obtained as indicated above, the calcine is a complex fertilizer of prolonged action.

Fertilizers can be used for acid sod-podzolic soils of the Perm region and the North of Russia for grain, silage crops and perennial grasses. Fertilizer can be added to the soil once a crop rotation (48 years). They can be used in three qualities: 1) as an ameliorant to neutralize soil acidity and improve agro-physical properties; 2) as potassium and calcium fertilizers prolonged action; 3) as the micro-fertilizer containing additives chalcophile elements (Cu, Zn), the content of which reaches 0,10 3%. In addition to the basic elements distributed (Cu, Zn)fertilizer is present over a wide range of trace elements, used in fertilizers, it is Fe, In, Mn, and MIC the items, Mo, Se with lower concentrations (0,0010,0001%).

In addition, fertilizers can be used for perennial shrub crops.

Technical efficiency of the proposed method of waste processing potash production is that when using the maximum possible waste of potash production.

1. Method for processing waste potash production, including staging, gidrotsiklonirovaniya waste in the form of a pulp slurry with a selection of preconcentrate and tailings slurry, dewatering, drying and granulation of preconcentrate and subsequent drying of the granulate to obtain a concentrate, wherein the gidrotsiklonirovaniya carried out in four stages 10, 7, 5 and 5-degree hydrocyclones with the temperature of the slurry 4050C, pressure 35 ATM with a ratio of nasdaw discharge : discharge average (1,141,17):1, drying of the granules is carried out at a temperature of 150200C, and after drying the granules are fired at a temperature of 650 to 950C.

2. The method according to claim 1, characterized in that after separation of preconcentrate slurry tailings defend and condensed part returns to the processing at the first stage gidrotsiklonirovaniya.



 

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