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Potassium sulphate preparing method through thermal melting, refrigeration and double decomposition crystallization method

A potassium sulfate and metathesis technology, applied in the field of salt chemical industry, can solve the problems of rich chemicals, low recovery rate of potassium sulfate, poor quality, etc., and achieve the effect of improving comprehensive utilization of energy, good effect and reducing production cost.

Inactive Publication Date: 2015-06-10
MANGYA XINGYUAN POTASH FERTILIZER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is aimed at the deficiencies in the prior art, and provides a method to solve the problem that a large amount of magnesium sulfate ore and low-grade potassium mixed salt ore produced by the existing magnesium sulfate subtype salt lake brine cannot be fully utilized, and at the same time provide The method of preparing potassium sulfate by hot melting, freezing and double decomposition crystallization to solve the problems of low recovery rate, poor quality and rich medicament of the flotation product potassium sulfate

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  • Potassium sulphate preparing method through thermal melting, refrigeration and double decomposition crystallization method
  • Potassium sulphate preparing method through thermal melting, refrigeration and double decomposition crystallization method

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Embodiment 1

[0024] The invention uses magnesium sulfate subtype brine as raw material, and the magnesium sulfate or potassium mixed salt ore containing sulfate radical obtained by evaporation and drying in salt fields is harvested and transported to a hot melting workshop. Take a section of mother liquor (temperature 15°C) discharged from the potassium sulfate production workshop and exchange heat through a heat exchanger, so that the temperature of a section of brine reaches (80°C). Mix high-temperature brine (80°C-110°C) with magnesium sulfate or potassium containing sulfate The salt is added into the heat-dissolving tank according to a certain ratio (1:0.5), and the heat-melting reaction time (20 min) is melted. After the liquid is melted, the feed liquid enters the heat preservation settler to settle, and the separated solid is tailing salt, which is discharged to the tailing salt dam, and the liquid is pumped into the The flash tank is cooled by negative pressure, the vacuum degree is...

Embodiment 2

[0026] The invention uses magnesium sulfate subtype brine as raw material, and the magnesium sulfate or potassium mixed salt ore containing sulfate radical obtained by evaporation and drying in salt fields is harvested and transported to a hot melting workshop. Take a section of mother liquor (temperature 25°C) discharged from the potassium sulfate production workshop and pass it through a heat exchanger to exchange heat so that the temperature of a section of brine reaches (95°C). The high-temperature brine (95°C) is mixed with magnesium sulfate or potassium sulfate. The ratio (1:0.9) is added to the hot-melt tank for hot-melt reaction time (40min). After hot-melting, the feed liquid enters the heat preservation settler to settle, and the solid is separated into tail salt, which is discharged to the tail salt dam, and the liquid is pumped into the flash tank for further processing. The vacuum degree of negative pressure cooling is (0.6 Mpa), and the temperature is controlled a...

Embodiment 3

[0028] The invention uses magnesium sulfate subtype brine as raw material, and the magnesium sulfate or potassium mixed salt ore containing sulfate radical obtained by evaporation and drying in salt fields is harvested and transported to a hot melting workshop. Take a section of mother liquor (temperature 35°C) discharged from the potassium sulfate production workshop and exchange heat through a heat exchanger, so that the temperature of a section of brine reaches (110°C) and mix high-temperature brine (110°C) with magnesium sulfate or potassium sulfate The ratio (1:2) is added to the hot-melt tank for hot-melt reaction time (60min). After hot-melt, the feed liquid enters the heat preservation settler to settle, and the solid is separated into tail salt, which is discharged to the tail salt dam, and the liquid is pumped into the flash tank for further processing. The vacuum degree of negative pressure cooling is (0.8 Mpa), the temperature is controlled at (65°C), and the feed l...

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Abstract

The invention relates to the technical field of salt chemical engineering, in particular to a potassium sulphate preparing method through thermal melting, refrigeration and a double decomposition crystallization method. The potassium sulphate preparing method includes the following steps of 1 raw material preparation, 2 thermal melting, 3 cold separation crystallization and 4 potassium sulphate preparation through a two-stage two-step method, wherein magnesium sulfate heptahydrate or kainite reacts with potassium chloride through a traditional two-stage two-step method to prepare a potassium sulphate product. The potassium sulphate preparing method has the advantages that the problem that subtype magnesium sulfate salt lake brine is low in one-time production rate of raw materials in a traditional process is solved, the problems that in a flotation technology, the one-time yield is low, a product contains a poison potion, and the product granularity is thin are solved, a potassium sulphate product does not contain medicament and is in a particle shape, and the value of the potassium sulphate product is enhanced. The method is mainly used for the process for preparing potassium sulphate through the subtype magnesium sulfate salt lake bittern or through coastal acrid bittern or the like, good in effect and capable of generating larger economical benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of salt chemical industry, in particular to a method for preparing potassium sulfate by hot melting, freezing and double decomposition crystallization. Background technique [0002] The traditional production methods for producing potassium sulfate can be divided into two categories, one is to use natural potassium-containing minerals to produce; the other is the conversion method, using potassium chloride as a raw material to produce potassium sulfate. The conversion method is divided into thermal method and wet method. However, the most typical thermal method is the Mannheim furnace method. The core device of the Mannheim furnace method is the reaction furnace, and the performance of the reaction furnace becomes the key to the process technology. Advantages of Mannheim furnace method: The performance of the reaction furnace determines the high purity, high conversion rate, production capacity and ease of o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/06
Inventor 陈高琪聂景新韩任健程学业郑宁李银林
Owner MANGYA XINGYUAN POTASH FERTILIZER
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