SU1294770A2 - Method for extracting potassium chloride from sylvinites - Google Patents

Abstract

The invention relates to methods for producing potassium chloride used in agriculture and reduces fuel and energy costs. The original sylvinite salt and a small fraction of potassium chloride are dissolved in the mother liquor. The sylvinite salt precipitate is separated, the sylvinite salt and the fine fraction of potassium chloride are introduced, the suspension is heated and cooled to separate the light fraction of potassium chloride, which is returned to the head of the process. A large fraction of potassium chloride is washed, filtered and dried. 20 kg of sylvinite salt and 20 kg of potassium chloride small fraction are dissolved in the mother liquor, 13.4 kg of sylvinite salt are separated, 80 kg of sylvinite salt are introduced, the suspension is heated to 70 ° C and cooled at 750 mmHg. up to 25 ° C. 16 kg of potassium chloride fine fraction (0-0.5 mm) is recovered and is fed as a suspension into the head of the process. The coarse fraction is washed, filtered and dried. A & 6.6 kg of potassium chloride is obtained with a basic substance content of 95.8% and a crystal size of 0.5-2.0 mm. Energy costs 10.6 kWh; fuel consumption 0.01 tons; caking coefficient 0.37. 1 tab. i (Lew so 4. N

Description

The invention relates to chemical technology of inorganic substances, specifically to the technology of potassium chloride used in agriculture as a fertilizer, and is an improvement of the method according to the authors. St. No. 1000397.

The purpose of the invention is to reduce fuel and energy costs,

The method is carried out, a solution of the initial sylvinite salt and a small fraction of potassium chloride (0-0.5 mm) in a hot stock solution. The undissolved salt is separated and the initial sylvinite salt or a small fraction of potassium chloride is introduced. The suspension is allowed to cool. After cooling, the solid phase of the suspension is classified with the release of a fine fraction of potassium scoride, the fine fraction is returned to the head of the process, and the large fraction is supplied for washing and drying.

Example 1. The initial sylvinite salt contains 83% KCl and 17% NaCl. The average crystal size is 0.4 mm

In a hot mother liquor, 20 kg of salt and 20 kg of the small fraction KCl (0.0-0.5 mm) are dissolved. 13.4 kg of undissolved residue is separated by settling and filtration. The saturated liquor is mixed with 80 kg of the original salt, the suspension is heated to 70 ° C and

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cooled at 750 mm Hg. up to 25 C with the introduction of 35.2 kg of water. From the cooled suspension, the classification separates 16 kg of crystals with a size of 0–0.5 mm and in the form of a suspension is fed to the beginning of the process, and the pulp with large crystals is filtered, washed and dried. Formed during the drying process

Small crystals with a size of 0-05 mm in the amount of 4.0 kg are captured and fed for dissolution.

86.6 kg of potassium chloride are obtained with a basic substance content of 95.8% and a crystal size of 0.5-2.0 mm.

Technical and economic indicators of the process are shown in the table.

As follows from the table, the method allows reducing fuel and energy costs during drying and filtration of the product.

o form u l inventions

The method of extraction of potassium chloride from sylvinites by auth.St. W 1000397, characterized in that, in order to reduce energy consumption, crystals less than 0.5 mm in size are separated from the suspension after cooling and from dry potassium chloride and are returned to the stage of dissolution of the starting salt.

Claims (1)

Claim The method of extraction of potassium chloride from sylvinites according to ed. No. 1000397, characterized in that, in order to reduce energy consumption, crystals less than 0.5 mm in size are isolated from the suspension after cooling and from dry potassium chloride and returned to the stage of dissolution of the initial salt. Example Decrease Chris Size Koeffi- Energy Consumption quantity tall, you- cient expenses, fuel, t salt on shared from tracking kWh dissolution suspensions and vaymos- due to dry chloro tee yes crystals potassium reed, with size 0-g0.5 mm,% mm Lime- tny - - 0.5 11.1 0.011 1 50,0 0-0.3 0.37 10.6 0.010 3 75.0 0-0.4 0.32 10,2 0.009 2 100.0 0-0.5 0.24 10.0 0.008 4 0 0-0.5 0.23 10.1 0.008 ВНИИПИ Order 553/24 Circulation 456 Subscription Custom polygr. ave, city of Uzhhorod, st. Design, *