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Technique for preparing agricultural potassium sulfate by utilizing kaliophilite powder

A technology for potassium nepheline powder and potassium sulfate, which is applied in the field of preparing agricultural potassium sulfate, can solve the problems of complex conditions in the reaction process and high cost of raw materials, and achieves the effects of mild reaction conditions, simple process and low production cost.

Active Publication Date: 2013-04-10
SHAANXI DAQIN POTASSIUM CO LTD
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Problems solved by technology

At present, the methods of producing potassium sulfate in my country mainly include: Mannheim method, Glauber's salt method, gypsum method, association method and ammonium sulfate method, etc. The main disadvantages are that potassium chloride is used as raw material, and the raw material cost is high, and the reaction process The conditions are complicated

Method used

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  • Technique for preparing agricultural potassium sulfate by utilizing kaliophilite powder
  • Technique for preparing agricultural potassium sulfate by utilizing kaliophilite powder

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Experimental program
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Embodiment

[0013] Table 1 The chemical composition analysis results of kalephine powder w B %

[0014]

[0015] The chemical composition analysis results of the kalite powder are shown in Table 1. Take by weighing 500g of kalephine powder, 2500g of distilled water, 400g of sulfuric acid with a mass concentration of 30%, mix uniformly, place in an acid-dissolving reactor together, adjust the reaction temperature of the reactor to be 60°C, and the stirring speed is 200r / min, After reacting for 3h, it was separated by filtration. It is determined that the dissolution rate of potassium oxide in the kacryptite powder raw material is 95.5wt%, and the dissolution rate of aluminum oxide is 0.06wt%. The potassium sulfate filtrate obtained by filtering is placed in a crystallizer, evaporated and crystallized under the condition of 115° C., and an agricultural potassium sulfate product is obtained. The three repeated test samples were compared with the indicators in the National Standard for ...

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Abstract

The invention discloses a technique for preparing agricultural potassium sulfate by taking kaliophilite powder as a raw material, and the technique comprises the following steps: evenly mixing the kaliophilite powder, distilled water and sulfuric acid; controlling the reaction conditions; controlling the dissolution rate of potassium oxide in kaliophilite to reach more than 95wt% and the dissolution rate of aluminum oxide to be less than 0.5wt%; filtering and separating after the reaction, wherein the filtrate is a potassium sulfate solution; and finally, carrying out evaporation and crystallization, thus obtaining the agricultural potassium sulfate product, wherein the filter cake is a silicon-aluminum compound which can be used for preparing products such as aluminum oxide, white carbonblack and the like. The technique is simple, mild in reaction condition and low in production cost.

Description

technical field [0001] The invention relates to a new process for preparing agricultural potassium sulfate by using kalephine powder as raw material. Background technique [0002] Potassium sulfate is a common chlorine-free crop fertilizer in the world. It can provide potassium and sulfur nutrients to crops at the same time, which can not only increase crop yield, but also improve its quality. It can be used in sulfur-deficient soil to improve the disease resistance of crops. At present, the methods of producing potassium sulfate in my country mainly include: Mannheim method, Glauber's salt method, gypsum method, association method and ammonium sulfate method, etc. The main disadvantages are that potassium chloride is used as raw material, and the raw material cost is high, and the reaction process conditions are complex. The present invention uses potassium nepheline powder as a raw material (obtained by hydrothermal treatment using potassium feldspar powder as a raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/00C01B33/26C05D1/02C01F7/02C01B33/12C01B39/00
Inventor 苏双青蔡比亚马鸿文罗征刘梅堂
Owner SHAANXI DAQIN POTASSIUM CO LTD
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