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Method for preparing mineral potassic fertilizer from potassium-enriched rock

A technology of potassium-rich rock and mineral potassium fertilizer, applied in the directions of potassium fertilizer, application, inorganic fertilizer, etc., can solve the problems of low content of active components in reaction products, harsh requirements for equipment corrosion resistance, and high reaction temperature, and achieves easy implementation and promotion, effective K2O content High and low process energy consumption

Active Publication Date: 2012-01-11
王月明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] To sum up, the existing technologies for utilizing water-insoluble potassium ore resources have certain defects: the acid method has the lowest reaction temperature, but has strict requirements on the corrosion resistance of equipment; the sintering method is easy to implement engineering, but the reaction temperature is high and energy consumption is high. High; the conditions of the hydrothermal method are relatively mild, but the content of active ingredients in the reaction product is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Test material: potassium-rich rock PF-1, the chemical composition analysis result shows that the K in the ore 2 O content is 13.26%; X-ray powder diffraction analysis results show that the main phase of the ore is potash feldspar, and the accessory mineral is muscovite.

[0028] (2) Test process: The raw ore of potassium-rich rock (PF-1) is coarsely crushed, medium crushed, and finely crushed, and then ground into mineral powder with a particle size of ≤120μm for use. Weigh 107.8g sodium hydroxide (purity 96%) and 117.7g potassium hydroxide (purity 82%) and dissolve them in 800mL distilled water to prepare circulating lye for use. Weigh 400.0g of potassium-rich rock (PF-1) ore powder, add it to the prepared circulating lye, stir and mix evenly to make raw ore slurry. Put the raw ore slurry in a hydrothermal reactor and react at a constant temperature at 200°C for 4h. After the reaction, the slurry was filtered after cooling and decompression. The obtained filter cake ...

Embodiment 2

[0031] (1) Test material: potassium-rich rock PF-2, the chemical composition analysis result shows that the K in the ore 2 O content is 10.57%; X-ray powder diffraction analysis results show that the main phase of the ore is potassium feldspar, and the accessory mineral is quartz.

[0032] (2) Test process: The raw ore of potassium-rich rock (PF-2) is coarsely crushed, medium crushed, and finely crushed, and then ground into mineral powder with a particle size of ≤120μm for use. Weigh 31.8g sodium hydroxide (purity 96%) and 121.6g potassium hydroxide (purity 82%) and dissolve in 800mL distilled water to prepare circulating lye for use. Weigh 142.0g of potassium-rich rock (PF-2) mineral powder, add it to the prepared circulating lye, stir and mix evenly to make raw ore slurry. Put the raw ore slurry in a hydrothermal reactor and react at a constant temperature at 220°C for 2h. After the reaction, the slurry was filtered after cooling and decompression, and the filter cake obtaine...

Embodiment 3

[0035] (1) Test material: potassium-rich rock PF-3, the chemical composition analysis result shows that K in the ore 2 O content is 15.58%; X-ray powder diffraction analysis results show that the main phase of the ore is potash feldspar, and the accessory mineral is neopymium.

[0036] (2) Test process: The raw ore of potassium-rich rock (PF-3) is coarsely crushed, medium crushed, and finely crushed, and then ground into mineral powder with a particle size of ≤120μm for use. Weigh 76.2g sodium hydroxide (purity 96%) and 124.9g potassium hydroxide (purity 82%) and dissolve them in 800mL distilled water to prepare circulating lye for use. Weigh 283.0g of potassium-rich rock (PF-3) mineral powder, add it to the prepared circulating lye, stir and mix evenly to make raw ore slurry. Put the raw ore slurry in a hydrothermal reactor and react at a constant temperature at 280°C for 5 hours. After the reaction, the slurry was filtered after cooling and decompression. The obtained filter c...

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Abstract

The invention relates to a production method of an inorganic mineral fertilizer, and aims at providing a method for preparing a mineral potassic fertilizer from a potassium-enriched rock, which has a simple technical process and can obtain products having a high active K2O content. The method comprises the following steps: preparing KOH and NaOH into a circulated alkaline solution, uniformly mixing raw ore powder of the potassium-enriched rock with the circulated alkaline solution, preparing into a raw ore pulp by stirring, and placing the raw ore pulp in a hydrothermal reactor to be subject to an isothermal reaction at 180-320 DEG C for 0.5-8h; obtaining a feed pulp after the hydrothermal reaction, filtering to obtain a filtrate and a filter cake, and washing and drying the filter cake to obtain the final product, the mineral potassic fertilizer. The active K2O content of the mineral potassic fertilizer prepared by the method is 10-30%. Besides, the method has the advantages of wide material source, simple technical process and easy control on technical parameters.

Description

Technical field [0001] The invention relates to a method for producing inorganic mineral fertilizers, in particular to a method for preparing mineral potassium fertilizers from potassium-rich rocks. Background technique [0002] my country is a big agricultural country. The annual consumption of potash fertilizer exceeds 5 million tons (converted to pure K 2 O). Due to the lack of water-soluble potash resources in my country, the dependence on potash fertilizer imports has been above 50% over the years. The large-scale mineral deposits of water-soluble potash resources that have been identified in China are concentrated in Qinghai, Xinjiang, Tibet, Yunnan, Shandong, Gansu and other provinces, while the market demand for potash fertilizer is scattered in Northeast, North, East, Central, South, and Southwest China There is a huge imbalance between the existing potash fertilizer production and consumption in areas where agriculture is mainly cultivated. my country is rich in water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/04
Inventor 王月明
Owner 王月明