Process for preparing K fertilizer (K salt) from K-enriched rock and lime by hydrothermal method

A technology of potassium-rich rock and gypsum water, applied in the directions of potash fertilizers, chemical instruments and methods, inorganic fertilizers, etc., can solve problems such as no report on details, and achieve the effects of reduced production cost, low energy consumption, and convenient operation.

Inactive Publication Date: 2005-07-06
ZHONGKE JIANCHENG MINERAL TECH BEIJING
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Problems solved by technology

According to the report of Chinese Journal of Science on January 24, 1994, Professor Yan Yongjie of East China University of Science and Technology used the pressu

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  • Process for preparing K fertilizer (K salt) from K-enriched rock and lime by hydrothermal method
  • Process for preparing K fertilizer (K salt) from K-enriched rock and lime by hydrothermal method

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Embodiment Construction

[0037] raw material

[0038] Potassium-rich rock: collected from Nanshan, Miyun County, Beijing, its chemical composition (%):

[0039] SiO 2 TiO 2 al 2 o 3 (Fe 2 o 3 +FeO) MnO 2 CaO MgO K 2 O Na 2 OP 2 o 5 Loss on ignition Total

[0040] 63.09 0.71 15.69 4.41 0.02 0.15 0.37 12.79 0.22 0.04 1.93 99.42

[0041] X-ray powder crystal diffraction analysis indicates that the mineral composition of the potassium-rich rock is mainly potassium feldspar, and the others are quartz.

[0042] Lime: CaO content 97%, purchased from the market.

[0043] Gypsum: purchased from the market.

[0044] (1) Put 5.000g of potassium-rich rock coarse powder, 4.000g of lime coarse powder, and 1.000g of hemihydrate gypsum powder into an agate mortar, add about 10ml of water, and grind thoroughly so that the particle size of the material reaches below 200 mesh, and mix evenly , then transfer the material to a plastic container, and then add some water to make solid: liquid: = 1: 1...

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Abstract

A process for preparing potassium fertilizer (or salt) from the rock rich in potassium includes such steps as crushing the said rock, lime and gypsum, mixing them in ratio of 1:(0.8-1):(0.2-0.25), wet ball grinding to finer than 200 meshes, proportionally mixing it with water, hydrothermal reaction at 130-250 deg.C for 5-24 hr by introducing high-pressure steam to obtain KOH, and preparing potassium salt from the obtained KOH.

Description

technical field [0001] The invention relates to a method for preparing potassium fertilizer from potassium-rich rock-lime-gypsum hydrothermal method. Background technique [0002] Potassium-rich rock (insoluble potassium ore) refers to a special type of rock mainly composed of authigenic high-potassium silicate minerals. In this type of rock, the potassium-containing minerals are mainly potassium feldspar, illite, glauconite, mica minerals, etc., and the chemical composition is K 2 O content is relatively high, generally 8%-16%. my country has extremely rich potassium-rich rock resources, which are widely distributed. According to the estimates of experts from the geological and mining department, the national potassium-rich rock reserves are equivalent to K 2 O is about 5 billion tons or more. [0003] my country is a country that lacks soluble potassium salt resources. In order to solve the serious shortage of agricultural potassium fertilizers, we are jointly developi...

Claims

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Application Information

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IPC IPC(8): C01D1/04C01D5/00C01D7/07C05D1/04
Inventor 韩成
Owner ZHONGKE JIANCHENG MINERAL TECH BEIJING
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