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Method for preparing potassic-magnesian fertilizer

A technology of potassium magnesium fertilizer and potassium chloride, which is applied in the field of utilization of salt lake resources, can solve the problems of idle waste of resources, high production costs, and long time consumption, and achieve the effects of reducing economic costs, shortening production cycles, and saving fresh water resources

Active Publication Date: 2015-01-07
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The direct use of sun-dried salt field potash minerals to add water to produce lenbeinite has the following disadvantages: 1. It takes a long time to dry salt field potash minerals; 2. The utilization rate of resources is low, and the mother liquor produced The potassium content is high, so that the potassium in the potash minerals in the salt field is not fully utilized; 3. The by-product of the salt field, thenardite, is not used, resulting in idle waste of valuable resources; 4. The production cost is high, and a large amount of tail liquid produced during the production process, Failure to recycle in time, and requires a special tailing salt pond, which increases production costs

Method used

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  • Method for preparing potassic-magnesian fertilizer
  • Method for preparing potassic-magnesian fertilizer

Examples

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preparation example Construction

[0029] Such as figure 2 Shown, a kind of preparation method of potassium magnesium fertilizer, described method comprises the following steps:

[0030] 1) Mix potassium chloride, Glauber's salt and high-magnesium salt lake brine at a mass ratio of 1-2:1-2:5-15, stir and react at room temperature for 0.5-1.5 hours, and control the stirring rate at 350-400r / min, Fully react and convert raw materials to obtain slurry;

[0031] 2) Add the slurry obtained in step 1) into the flotation brine according to the mass ratio of 1:4 to 6, then add the flotation agent, and use two fine and one sweep flotation separation to obtain high-grade potassium magnesium fertilizer and mother liquor;

[0032] 3) The mother liquor is returned to the salt field after being evaporated and then used as high-magnesium salt lake brine to react with Glauber's salt and potassium chloride, or the mother liquor is directly used as flotation brine for flotation separation;

[0033] Wherein, the composition of...

Embodiment 1

[0035] Potassium chloride, Glauber's salt and high-magnesium salt lake brine (composed of: 1.5-2.1% K + , 6.5-8.5% of Mg 2+ , 18.0~22.0% Cl - , 4.0-5.2% SO 4 2- , 0.5~1.0% Na + , 66.0-69.5% H 2 O) fully mix according to the ratio of mass ratio 1:2:5, the stirring speed is controlled at 350r / min, and the stirring reaction at room temperature is 30min to obtain the slurry, and the slurry and flotation brine are mixed evenly according to the mass ratio of 1:4, using two Fine sweeping process, flotation separation, to obtain high-grade potassium magnesium fertilizer and mother liquor.

[0036] Among them, in potassium and magnesium fertilizers: K + : 17.5%, Mg 2+ : 5.56%. Potassium recovery rate is 90%.

Embodiment 2

[0038]Potassium chloride, Glauber's salt and high-magnesium salt lake brine (composed of: 1.5-2.1% K + , 6.5-8.5% of Mg 2+ , 18.0~22.0% Cl - , 4.0-5.2% SO 4 2- , 0.5~1.0% Na + , 66.0-69.5% H 2 O) fully mix according to the ratio of mass ratio 1:2:10, the stirring rate is controlled at 400r / min, and the stirring reaction at room temperature is 60min to obtain the slurry, and the slurry and the flotation brine (the mother liquor obtained in Example 1) are mixed according to the mass ratio of 1 :5 Mix evenly, adopt two-finishing and one-sweeping process, flotation separation, and obtain high-grade potassium and magnesium fertilizer and mother liquor.

[0039] Among them, in potassium and magnesium fertilizers: K + : 18.5%, Mg 2+ : 5.25%. Potassium recovery rate is 95%.

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Abstract

The invention discloses a method for preparing a potassic-magnesian fertilizer. The method comprises the following steps: (1) mixing potassium chloride, mirabilite and high-magnesium salt lake brine according to a mass ratio of (1-2):(1-2):(5-15), stirring and reacting at the room temperature for 0.5-1.5 hours, and controlling the stirring rate to be 350-400 revolutions per minute, so that the raw materials are fully reacted and converted to obtain slurry; (2) adding the slurry obtained in the step (1) into flotation brine according to a mass ratio of 1:(4-6), adding a flotation reagent, performing two-refining one-sweeping flotation separation, washing, thereby obtaining a high-grade potassic-magnesian fertilizer and a mother solution; and (3) returning the mother solution to a salt pan, evaporating the mother solution to serve as high-magnesium salt lake brine, reacting with the mirabilite and potassium chloride, or directly taking the mother solution as the flotation brine to be used for flotation separation. The method disclosed by the invention is low in energy consumption, low in cost, simple in process flow, short in production period and convenient for industrial production, and the produced potassic-magnesian fertilizer is high in grade.

Description

technical field [0001] The invention belongs to the utilization field of salt lake resources, in particular, the invention relates to a preparation method of potassium and magnesium fertilizer. Background technique [0002] Potassium-magnesium fertilizer is a high-quality mineral fertilizer, which not only contains the macronutrient potassium required by crops, but also contains two medium-nutrient elements, sulfur and magnesium. Through balanced fertilization, it makes up for the deficiency of medium and trace elements. It can effectively increase crop yield and improve crop quality. At present, there are good development opportunities and broad market prospects in China. The potassium and magnesium fertilizers sold in China are divided into three types: one is a fertilizer simply mixed with potassium sulfate or potassium chloride and magnesium sulfate; the other is a fertilizer made of sulfur magnesium Potassium magnesium sulfate fertilizer produced directly from potash o...

Claims

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Application Information

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IPC IPC(8): C05G1/00
CPCC05D1/00C05D5/00
Inventor 赵冬梅张志宏张永明董生发马艳芳付振海安东胡天琦
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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