SU582238A1 - Method of obtaining non-sticking potash fertilizer with extended service life - Google Patents

Description

no less than 3 minutes, in the drum room - not less than 15 minutes, the temperature of the fertilizer at the exit of the KS furnace is 120-140 ° C, on the drum furnace - 80-110 ° C. Dried salt is fed to the finished goods warehouse or loaded directly into railway wagons for shipment to the consumer.

Example 2. 40% aqueous solution of MFS (20% solution of copper sulphate) is mixed with resin KS-11, the weight ratio of dry matter 0.1: S, and in the amount of 3-9 liters per topne pre-dried and having its temperature is 120-140 ° C. Potassium chloride is fed to the fertilizer just before it is fed to a roller press. Pressing pressure of at least 200 kgf / cm. The granulated product system elevators and conveyors served on the crushing and screening. The selected fraction of 4 + 1 mm is fed to the warehouse or to the country and used as a ready-made granulated potash fertilizer with an extended period of action.

Example 3. A 20% solution of copper sulphate is mixed with a 50% aqueous solution of KS-11 urea-formaldehyde resin in a ratio of 1: 1 (weight ratio by dry weight 0.2: 1.0) and in the amount of 20-40 l per ton of powdered pre-dried KC1 is fed into the fertilizer, mixed in paddle or screw mixers. The resulting mixture is pressed on hydraulic presses at a pressure of 50 kgf / cm. The resulting briquettes are dried, crushed and classified into classes 4 and 1 mm. The selected fraction of 4 + 1 mm is used as slow-pounded granulated potash fertilizer mainly for peat-bog soils.

Experimental verification of the proposed method showed that preliminary displacement of urea-formaldehyde resins with sulphate or chloride salts of Cu, Zn, Mp, Fe, Mg before introducing the resins into the potassium fertilizer significantly reduces the drying time of fertilizers, which is necessary for complete curing of the resins, and also improves the properties hardened resin shells. Due to this, the rate of dissolution of fertilizers is further reduced, which reduces their leaching from the soil.

In tab. Figure 1 presents data on the effect of drying potassium chloride coated with urea formaldehyde resin (a known method) and a mixture of MFS with MgCb and CuSO (proposed method) on the amount of dissolved fertilizer for 30 minutes in a constant volume of water at 140 ° C.

The proposed method, along with a decrease in the dissolution rate of potash fertilizers, makes it possible to give them good flowability and completely eliminate their caking during transport and storage. The combined use of MPS thermal and acid curing allows them to be quickly converted into an insoluble compound and completely eliminate their adhesive properties.

Table 1

In tab. Table 2 presents data on the effect of 20 MPS additives with a hardener on the caking behavior of granulated potash fertilizers, which is estimated as follows.

table 2

A portion of potassium chloride was treated with a solution of MFS containing sulphate or chloride salts of Cu, Zn, Mn and other elements and dried at 120 ° C for

15 minutes. The dried salt was moistened to 2% moisture and pressed at a pressure of 500 kgf / cm for 5 minutes. The obtained fertilizer granules were dried at 105-110 ° C to a constant weight, cooled.

and determine their compressive strength.

The resulting potassium fertilizers have low hygroscopicity. Therefore, they maintain good flowability even at high humidity.

Claims (2)

1. A method of obtaining non-sticky potash fertilizers with an extended period of action by mixing powdered fertilizers with a urea-formaldehyde resin and their subsequent granulation and drying, I distinguish p; and in order to reduce caking, solubility and drying time of fertilizers, to improve their agrochemical properties, the urea-formaldehyde resin is pre-mixed with a saturated solution of an acidic metal salt. 2 The method according to claim 1, characterized in that the acidic metal salt uses sulfuric acid and chloride salts of copper, manganese cins, iron, and magnesium. 3. The method according to claim 1, except for the fact that the weight ratio of acid salt and urea-formaldehyde resin (by dry substance) is 0.1-1.0: 1.0, 5 Sources information taken into account in the examination 1. US Patent No. 3186826, cl. 71-6,1965. 2. US patent No. 3477842, cl. 71-26, 1969.