Method for producing food-grade potassium chloride through multistage flash evaporation, cooling and continuous crystallization

A potassium chloride, food-grade technology, applied in the field of inorganic salt evaporation and crystallization, can solve the problems that the product quality is difficult to meet the requirements of food-grade potassium chloride production, the one-time yield of potassium chloride products is low, and the impurities of potassium chloride are high. , to achieve the effects of stable and controllable product quality, improved product quality, and low energy consumption

Active Publication Date: 2014-02-19
ZHEJIANG DAYANG BIOTECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The potassium chloride prepared by the method described in the invention patent has high impurities, and this process is a typical dissolution cooling crystallization process, and there is no evaporation process in the crystallization process,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0064] Embodiment 1-1, a kind of method for the continuous crystallization production food-grade potassium chloride of multi-stage flash evaporating cooling, carries out following steps successively:

[0065] 1) Put 6170 kg of potassium chloride with a content of 96.5% into 11m 3 Make a potassium chloride supersaturated solution in tap water, heat it to 110°C (pass steam into the jacket under stirring), and dissolve the potassium chloride crystals to obtain a potassium chloride saturated solution Ⅰ, and the obtained potassium chloride saturated solution Ⅰ Contains 5950kg of potassium chloride;

[0066] 2), go to the above step 1) to obtain all saturated potassium chloride solution I (about 14.4m 3 ) into 48 kg of potassium hydroxide to adjust the pH value of potassium chloride saturated solution I to 12, then add 6.2 kg of calcium oxide and stir to dissolve, then add 11 kg of ammonium chloride and 30 kg of potassium dihydrogen phosphate respectively, and stir After 30 minute...

Embodiment 1-2

[0074] Embodiment 1-2, a kind of method for the continuous crystallization production food-grade potassium chloride of multi-stage flash evaporation, carries out following steps successively:

[0075] 1) Put 3,280 kg of potassium chloride with a content of 96.5% into a preheated (temperature of 50-52°C) 10m 3 Potassium chloride mother liquor Ⅰ and 1.5m 3 Make a potassium chloride supersaturated solution in tap water, heat it to 110°C (pass steam into the jacket under stirring), and dissolve the potassium chloride crystals to obtain a potassium chloride saturated solution Ⅰ, and the obtained potassium chloride saturated solution Ⅰ Contains 6050kg of potassium chloride;

[0076] 2) Add potassium hydroxide to all the saturated potassium chloride solution I obtained in the above step 1) until the pH value of the saturated potassium chloride solution I reaches 12, then add 3.3 kg of calcium oxide and stir to dissolve, then add 6 kilograms of ammonium chloride and 16 kilograms of ...

Embodiment 2

[0081] Embodiment 2: a kind of method for the continuous crystallization production food-grade potassium chloride of multi-stage flash evaporation, carries out following steps successively:

[0082] 1) Put 3120 kg of potassium chloride with a content of 96.5% into the 10.5m 3 Potassium chloride mother liquor Ⅰ and 1m 3 Make a potassium chloride supersaturated solution in tap water, heat it to 110°C (pass steam into the jacket under stirring), and dissolve the potassium chloride crystals to obtain a potassium chloride saturated solution Ⅰ, and the obtained potassium chloride saturated solution Ⅰ Contains 6030kg of potassium chloride;

[0083] 2) Add potassium hydroxide to the above-mentioned saturated potassium chloride solution I until the pH value of the saturated potassium chloride solution I reaches 12, then add 3.1 kg of calcium oxide and stir to dissolve, then add 6 kg of chloride Ammonium and 16 kilograms of potassium dihydrogen phosphate, after stirring for 30 minutes...

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Abstract

The invention discloses a method for producing food-grade potassium chloride through multistage flash evaporation, cooling and continuous crystallization. The method comprises the following steps: 1) putting potassium chloride into a solution, heating to 100-110 DEG C to form a potassium chloride saturated solution I, 2) sequentially adding alkali and a purifier into the potassium chloride saturated solution I for heat preservation sedimentation, 3) filtering supernate obtained in Step 2), neutralizing with hydrochloric acid to be neutral, 4) pumping a potassium chloride saturated solution II to a single-effect flash evaporation crystallizer for flash evaporation, cooling and concentration, 5) conveying potassium chloride slurry I to a double-effect flash evaporation crystallizer for flash evaporation, cooling and the concentration with a forced circulation pump, 6) conveying potassium chloride slurry II to a triple-effect flash evaporation crystallizer for flash evaporation, cooling and concentration with another forced circulation pump, 7) separating potassium chloride slurry III with a centrifuge to form a potassium chloride wet product and a potassium chloride mother solution I, and 8) drying and packaging the potassium chloride wet product to form food-grade potassium chloride.

Description

technical field [0001] The technology of the invention belongs to the field of evaporation and crystallization of inorganic salts, and relates to a production process for refining potassium chloride, in particular to a process for producing food-grade potassium chloride by multi-stage flash evaporation cooling and continuous crystallization. Background technique [0002] Potassium chloride is a colorless elongated rhomboid or cubic crystal or small white crystalline particles, mainly used in the inorganic industry, and is the basic raw material for the manufacture of various potassium salts such as potassium hydroxide, potassium sulfate, potassium nitrate, potassium chlorate, and potassium red alum ; The dye industry is used to produce G salt and reactive dyes; it is an important potassium fertilizer in agriculture; it is also used for muzzle or muzzle anti-inflammatory, steel heat treatment, electroplating and photographic industries. The taste of potassium chloride is simi...

Claims

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Application Information

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IPC IPC(8): C01D3/14
Inventor 王国平徐旭辉关卫军汪贤玉涂永福钱雪明孔庆颐
Owner ZHEJIANG DAYANG BIOTECH GROUP
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