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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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Example Embodiment

[0029] Such as figure 2 As shown, a method for preparing potassium magnesium fertilizer, the method includes the following steps:

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

[0031] 2) The slurry obtained in step 1) is added to the flotation brine at a mass ratio of 1:4-6, and then the flotation agent is added, and high-grade potassium-magnesium fertilizer and mother liquor are obtained by flotation separation with two fines and one sweep;

[0032] 3) The mother liquor is returned to the salt field and 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 the high-magnesium salt lake brine is...

Example Embodiment

[0034] Example one

[0035] Combine potassium chloride, Glauber's salt and high-magnesium salt lake brine (composition: 1.5~2.1% K + , 6.5~8.5% Mg 2+ , 18.0~22.0% Cl - , 4.0~5.2% SO 4 2- , 0.5~1.0% Na + , 66.0~69.5% of H 2 O) Mix thoroughly according to the mass ratio of 1:2:5, the stirring rate is controlled at 350r / min, and the reaction is stirred at room temperature for 30 minutes to obtain a slurry. The slurry and the flotation brine are mixed evenly according to the mass ratio of 1:4. Sweep the process finely, flotation and 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%. The potassium recovery rate is 90%.

Example Embodiment

[0037] Example two

[0038] Combine potassium chloride, Glauber's salt and high-magnesium salt lake brine (composition: 1.5~2.1% K + , 6.5~8.5% Mg 2+ , 18.0~22.0% Cl - , 4.0~5.2% SO 4 2- , 0.5~1.0% Na + , 66.0~69.5% of H 2 O) Mix thoroughly according to the mass ratio of 1:2:10, the stirring rate is controlled at 400r / min, and the reaction is stirred at room temperature for 60 minutes to obtain a slurry. The slurry and the flotation brine (the mother liquor obtained in Example 1) are in accordance with the mass ratio of 1. :5 Mix uniformly, adopt two fine and one sweep procedures, flotation and separation, to obtain high-grade potassium magnesium fertilizer and mother liquor.

[0039] Among them, in potassium and magnesium fertilizers: K + : 18.5%, Mg 2+ : 5.25%. The 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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