Preparation method of potassium sulfate

A technology of potassium sulfate and soft potassium, which is applied in the field of preparing potassium sulfate by flotation process, can solve the problems of limited solvency, waste of Glauber’s salt ore, and large amount of circulating materials, so as to reduce the amount of material circulation, avoid the loss of potassium salt, and shorten the process The effect of the process

Inactive Publication Date: 2014-09-03
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

This method has the following disadvantages: (1), the thenardite ore used in this method needs to be dissolved and mechanically removed to prepare a relatively pure saturated solution before it can be used in the production process, which increases the thenardite refining process and increases the cost
Secondly, Glauberite ore dissolves at room temperature, and it is easy to agglomerate, which brings difficulties to the dissolution. The insoluble Glauberite ore will be discharged with other impurities during the process of mechanical impurity removal, resulting in waste of Glauber’s salt ore.
(2), carnallite ore is decomposed with potassium sulfate mother liquor, the decomposed slurry adopts the method of flotation to obtain crude potassium chloride, and then the crude potassium chloride is refined to obtain refined potassium chloride, which increases the potassium chloride refining process , increasing the cost
(3), in potassium chloride refining process, reduce the solubility of potassium chloride by introducing tensio-active agent, improve the yield of potassium chloride, this has brought environmental protection problem to the processing of potassium chloride refining mother liquor, has increased cost
The method has the following disadvantages: (1), the method mixes various materials such as mirabilite, carnallite, soft potassium magnesium vanadium mother liquor, and potassium sulfate mother liquor, and strictly controls the content of potassium, magnesium, sulfate radicals and water in the mixed materials. Ratio, high process condition control requirements, difficult production control, weak process adaptability
It is more difficult to carry out hot filtration operation for the slurry containing higher insolubles. In addition, during hot filtration, due to the drop in temperature, part of the potassium salt will be lost, reducing the potassium yield.
(3), the method adopts the method of heat dissolving, the potassium in the raw material, magnesium sulfate are dissolved into solution, because the dissolving ability of dissolving medium-circulation mother liquor is limited, causes production one ton of potassium sulfate, the circulation in process operation process The amount of material is large, and the production energy consumption is high

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  • Preparation method of potassium sulfate

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preparation example Construction

[0039] refer to figure 1 , the preparation method of the potassium sulfate provided in this specific embodiment comprises steps:

[0040] S101. Mix and transform Glauber's salt, carnallite ore and water according to a weight ratio of 1:(2-5):(1.5-3) to obtain a first slurry;

[0041] S102. Using a flotation process to select soft potassium mixed salt from the first slurry, the soft potassium mixed salt is a mixture of soft potassium magnesium vanadium and potassium chloride;

[0042] S103. Carnallite ore, potassium sulfate mother liquor and water are mixed and converted according to a weight ratio of 1: (2-5): (0.2-2), to obtain a second slurry;

[0043] S104, using a flotation process to select potash rock from the second slurry, and the potash rock is crude potassium chloride;

[0044] S105. Mix and transform the soft potash mixed salt, sylvitite and water according to a weight ratio of 1:(0.2-1):(1-2) to obtain a third slurry, and carry out the third slurry Solid-liquid ...

Embodiment 1

[0050] 1. Mix and transform Glauber's salt, carnallite ore and water at a weight ratio of 1:2:1.5 to obtain slurry I. Among them, in this step, the temperature of mixed transformation is 15°C, and the time of mixed transformation is 2.5h; the carnallite ore is chloride type Yantian carnallite ore, and its main components are: NaCl+KCl MgCl 2 ·6H 2 O.

[0051] 2. The soft potassium mixed salt is selected from the slurry I by flotation process, and the soft potassium mixed salt is a mixture of soft potassium magnesium vanadium and potassium chloride. Specifically, firstly, the slurry I is injected into the pulping tank, and the pulping mother liquor and the flotation agent are added for slurrying, so that the pulp concentration (the weight content of solids in the pulp) is 15%, and the contact time between the flotation agent and the pulp is 15%. It can reach more than 3 minutes; then the adjusted pulp goes through the flotation process of one coarse, one sweep and two fines i...

Embodiment 2

[0057] 1. Mix and transform Glauber's salt, carnallite ore and water in a weight ratio of 1:5:3 to obtain slurry I. Wherein, in this step, the temperature of mixed transformation is 35°C, and the time of mixed transformation is 0.5h; the carnallite ore adopts chloride type Yantian carnallite ore, and its main components are: NaCl+KCl·MgCl 2 ·6H 2 O.

[0058] 2. The soft potassium mixed salt is selected from the slurry I by flotation process, and the soft potassium mixed salt is a mixture of soft potassium magnesium vanadium and potassium chloride. Specifically, firstly inject the slurry I into the slurry tank, add the slurry mother liquor and the flotation agent to adjust the slurry, make the pulp concentration (the weight content of the solid in the slurry) be 40%, and make the contact time of the flotation agent and the slurry It reaches about 15 minutes; then the adjusted pulp goes through the flotation process of one coarse, one sweep and two fines in turn to obtain the ...

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Abstract

The invention discloses a preparation method of potassium sulfate. The method comprises the steps of S101, performing hybrid conversion on mirabilite, carnallite ore and water to obtain first slurry; S102, selecting soft potassium mixed salt from the first slurry by adopting a flotation process, wherein soft potassium mixed salt is a mixture of picromerite and potassium chloride; S103, performing hybrid conversion on carnallite ore, potassium sulfate mother liquor and water to obtain second slurry; S104, selecting sylvinite which is crude potassium chloride from the second slurry by using the flotation process; S105, performing hybrid conversion on soft potassium mixed salt, sylvinite and water to obtain third slurry, and performing solid-liquid separation on the third slurry to obtain a solid-phase potassium sulfate semi-finished product; S106, performing hybrid conversion on the potassium sulfate semi-finished product and water to obtain fourth slurry, and performing solid-liquid separation on the fourth slurry to obtain a potassium sulfate finished product. Compared with the prior art, the method disclosed by the invention can be used for shortening the technological process and increasing the adaptability of the technology to raw materials.

Description

technical field [0001] The invention relates to a method for preparing potassium sulfate, in particular to a method for preparing potassium sulfate by using mirabilite and carnallite as raw materials in combination with a flotation process. Background technique [0002] Potassium sulfate is a high-quality potassium fertilizer, and its application range and effect are far better than potassium chloride. Potassium sulfate can basically be applied to crops that can be applied with potassium chloride, but potassium chloride cannot be applied to some crops that can be applied with potassium sulfate, such as tobacco, fruit and other economic crops. Therefore, potassium sulfate has a wider application range and better effect than potassium chloride. Since the natural resources that can produce potassium sulfate are less than potassium chloride, the output of potassium sulfate is less than potassium chloride, the price is higher than potassium chloride, and the application amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
Inventor 李海民陈育刚杨海云孟瑞英
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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