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An analytical method for detecting free water content in crystalline potassium and magnesium fertilizers

An analysis method and technology for potassium and magnesium fertilizers, which are applied in the direction of removing a certain component and weighing, etc., can solve the problems of complicated operation, inaccurate and inapplicable analysis results of the vacuum oven method, and achieve accurate analysis results, simple operation, Analyze low-cost effects

Inactive Publication Date: 2016-04-06
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides an analysis method of free water content in crystalline potassium and magnesium fertilizers, aiming to solve the problem that the existing Karl Fischer method is complex in operation and unsuitable for free water determination of salts containing crystal water, and vacuum oven method analysis Technical issues with inaccurate results

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  • An analytical method for detecting free water content in crystalline potassium and magnesium fertilizers

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Effect test

Embodiment 1

[0018] In a pre-dried and constant-weight weighing bottle, weigh 1.9935g of potassium-magnesium fertilizer crystals; place the weighed potassium-magnesium fertilizer crystals at a temperature of 35°C and a vacuum of 7.0×10 4 Constant weight in a Pa vacuum drying oven for 6 hours; take out the dried potassium magnesium fertilizer crystals and put them into a desiccator to cool to room temperature; The crystal weight is 1.9935g. Under this analysis condition, there is no significant change in the crystal weight of the potassium magnesium fertilizer. According to the calculation formula, the free water content in the potassium magnesium fertilizer crystal is: 0.0000%.

Embodiment 2

[0020] In a pre-dried and constant-weight weighing bottle, weigh 2.0105g of potassium-magnesium fertilizer crystals; place the weighed potassium-magnesium fertilizer crystals at a temperature of 35°C and a vacuum of 7.0×10 4 Constant weight in a vacuum drying oven of Pa for 6 hours; take out the dried potassium magnesium fertilizer crystals and put them in a desiccator to cool to room temperature; carry out constant weight of the cooled potassium magnesium fertilizer crystals, and the constant weight The weight of the final potassium and magnesium fertilizer is 1.9496g. According to the calculation according to the formula ω (%)=(m-m1)×100 / m, the percentage of free water is: (2.0105-1.9496)×100 / m=3.0291 %.

Embodiment 3

[0022] In a pre-dried and constant-weight weighing bottle, weigh 1.9396g of potassium-magnesium fertilizer crystals; place the weighed potassium-magnesium fertilizer crystals at a temperature of 35°C and a vacuum of 8.0×10 4 Constant weight in Pa vacuum drying oven for 5 hours; take out the dried potassium magnesium fertilizer crystals and put them into a desiccator to cool to room temperature; The weight is 1.9396g, and the weight of the potassium-magnesium fertilizer crystal has no significant change under the analysis conditions, that is, the percentage of free water in the potassium-magnesium fertilizer crystal is 0.0000%.

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Abstract

The invention relates to the technical field of compound fertilizer detection, and in particular relates to an analysis method for detecting the content of free water in a crystallized potassium-magnesium fertilizer. The method comprises the steps that potassium-magnesium fertilizer crystals are weighed in a pre-dried and constant-weight weighing bottle; the weighed potassium-magnesium fertilizer crystals are placed in a vacuum drying oven till constant weight is achieved, then taken out and placed in a drier for cooling; the cooled potassium-magnesium fertilizer crystals are dried till the constant weight is achieved; and the content of the free water in the potassium-magnesium fertilizer is calculated. According to the method, analysis is performed with the low-temperature vacuum drying oven, so that the content of the free water in the crystallized potassium-magnesium fertilizer can be analyzed under the condition that the potassium-magnesium fertilizer crystals are not damaged; the analysis cost is low; the operation is simple; and an analysis result is precise due to the fact that no interference of outside moisture exists in the whole process.

Description

technical field [0001] The invention relates to the technical field of detection of compound fertilizers, in particular to an analysis method for detecting free water content in crystalline potassium-magnesium fertilizers. Background technique [0002] Crystalline Potassium Magnesium Fertilizer is a chlorine-free fertilizer containing Potassium Magnesium Sulfate with the chemical molecule K 2 SO 4 · MgSO 4 ·6H 2 O. During the production, storage and transportation of this fertilizer, its active ingredients, appearance and physical properties will be affected by changes in the free water content. Since the natural drying is used in the production process, the abnormal moisture content in the product will seriously affect the use effect of the product, so the analysis of the free water content in it is an important indicator of production control and product quality. [0003] The methods used for the analysis of free water in compound fertilizers mainly include Karl Fisch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
Inventor 张志宏付振海马艳芳董生发何茂雄严志硕胡兆军
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI