Process for preparing potassium magnesium sulfate fertilizer with two-stage conversion and floatation method

A technology of potassium and magnesium sulfate fertilizer and flotation method, which is applied in the field of salt chemical industry, which can solve the problems of high potassium content, high energy consumption, and low operation recovery rate, so as to reduce the loss of potassium element, shorten the process flow, and improve the recovery rate Effect

Active Publication Date: 2008-12-10
青海中信国安锂业发展有限公司
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  • Abstract
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Problems solved by technology

The first method is suitable for use in mines of langbeinite ore. Most of the sulfate-type potassium-containing brines in China are difficult to produce langbeinite ore and cannot be used; the second method uses mechanical desodination technology to produce potassium magnesium sulfate fertilizer. Since the first-stage conversion of this method is completed under heating, it has the disadvantage of high energy consumption; the third method has the advantage of

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  • Process for preparing potassium magnesium sulfate fertilizer with two-stage conversion and floatation method
  • Process for preparing potassium magnesium sulfate fertilizer with two-stage conversion and floatation method

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Embodiment 1

[0008] Embodiment 1 A kind of technique of two-stage conversion, flotation method producing potassium magnesium sulfate fertilizer, get 6000 grams of potassium magnesium mixed salt ore, crush to 1mm particle diameter, put into stirring reactor, press potassium magnesium mixed salt ore: two Transfer mother liquor = 1:0.4 ratio ingredients, stir and react at room temperature for 30 minutes, complete one-stage transformation, filter the first-stage transformation slurry to obtain 5300 grams of first-transfer filter cake and 4750 grams of first-transfer mother liquor, and return to salt field to evaporate the first-stage mother liquor to obtain Potassium-magnesium mixed salt ore is mixed according to the ratio of filter cake: water = 1:0.5, stirred and reacted at room temperature for 30 minutes, and the second-stage conversion is completed. The potassium-magnesium mixed salt ore: floating The ratio of agent selection=1t:150g is added to the flotation agent. The flotation agent is s...

Embodiment 2

[0009] Embodiment 2 A kind of technology of two-stage conversion, flotation method producing potassium magnesium sulfate fertilizer, get 6000 grams of potassium magnesium mixed salt ore, crush to 20mm particle diameter, put in stirring reactor, press potassium magnesium mixed salt ore: two Transfer to mother liquor = 1:1 ratio of ingredients, stir and react at room temperature for 120 minutes, complete one-stage transformation, filter the first-stage transformation slurry to obtain 5100 grams of first-transfer filter cake and 6800 grams of first-transfer mother liquor, and return to salt field to evaporate the first-stage mother liquor to obtain Potassium-magnesium mixed salt ore is mixed according to the ratio of filter cake: water = 1:0.2, stirred and reacted at room temperature for 60 minutes, and the second-stage conversion is completed. The potassium-magnesium mixed salt ore: floating The ratio of agent selection=1t:400g is added to the flotation agent. The flotation agent...

Embodiment 3

[0010] Embodiment 3 A kind of technology of two-stage conversion, flotation method to produce potassium magnesium sulfate fertilizer, get 6000 grams of potassium magnesium mixed salt ore, crush to 10mm particle diameter, put into stirring reactor, press potassium magnesium mixed salt ore: two Transfer mother liquor=1:0.8 ratio ingredients, stir and react at normal temperature for 90 minutes, complete one-stage conversion, filter the first-stage transformation slurry to obtain 5200 grams of first-transfer filter cake and 5,500 grams of first-transfer mother liquor, and return to salt field to evaporate the first-stage mother liquor to obtain Potassium-magnesium mixed salt ore, batching according to the ratio of filter cake: water = 1:0.35, stirred and reacted at room temperature for 45 minutes, and completed the second-stage conversion, and mixed potassium-magnesium salt raw ore: floating The ratio of agent selection=1t:200g is added to the flotation agent, the flotation agent i...

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Abstract

The invention relates to a process for producing a potash magnesium sulphate fertilizer through secondary conversion and flotation method, comprising the following steps of: raw ore crushing, primary conversion, filtration, secondary conversion, mixture making, floatation, filtration, drying and packaging. The process adopts secondary conversion to make potassium-bearing mineral in potash-magnesia mixed salt completely convert into schoenite at a normal temperature, which avoids potassium element from losing in ore tailing because of incomplete conversion; secondary mother liquor is recycled so as to reduce the loss of the potassium element in discharged tail washings, thereby greatly improving recovery rate of the potassium element; and the process has the advantages of short process flow, energy conservation and simple operation, etc.

Description

1. Technical field [0001] The invention belongs to the field of salt chemical industry, and in particular relates to a process for producing potassium magnesium sulfate fertilizer by two-stage conversion and flotation. 2. Technical background [0002] Potassium magnesium sulfate fertilizer, the mineralogy name is langbeinite, molecular formula: K 2 SO 4 MgSO 4 6H 2 O, because it contains potassium, magnesium, and sulfur, which are essential elements for crop growth, can significantly increase crop yield, enhance crop cold resistance, drought resistance, and insect resistance, and is known as the "golden partner" of crop fertilization. Since it contains three nutrients of potassium, magnesium and sulfur, it can be used as a fertilizer and applied to economic crops, such as tobacco, vegetables, fruit trees, tea, etc. The countries producing potassium and magnesium sulfate fertilizer at home and abroad mainly include the United States, Russia and China. There are three prod...

Claims

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Application Information

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IPC IPC(8): C05D1/02C05D5/00
Inventor 李宏灿谈霞芦光圣马建玲赖学明魏廷祥顾忠苏郑红英
Owner 青海中信国安锂业发展有限公司
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