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A method for producing nitrogen phosphorus potassium compound fertilizer with water-insoluble potassium-containing rock

A nitrogen-phosphorus-potassium compound fertilizer, water-insoluble technology, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems of insufficient comprehensive utilization of raw materials, low added value of products, and long time-consuming, so as to avoid excessive processing time. , saving time and energy consumption, increasing the effect of added value

Inactive Publication Date: 2010-01-27
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-temperature decomposition of water-insoluble potassium-containing rocks to produce potassium fertilizers. This method uses the catalysis of fluorine-containing substances to decompose insoluble potassium-containing rocks in concentrated sulfuric acid medium, and then uses evaporation to dryness to remove residual fluorine in the reaction process. The method is time-consuming and expensive. In addition, the low-temperature decomposition of water-insoluble potassium-containing rocks only produces ammonium potassium sulfate compound fertilizer, white carbon black, aluminum hydroxide and other by-products, and the comprehensive utilization of raw materials is not enough and the added value of products is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix potassium feldspar crushed to 100 mesh with 98% concentrated sulfuric acid and 20% fluosilicic acid in the ratio of 1:0.2:8 by weight in the pre-mixing tank, then flow into the reaction kettle by gravity, and heat under normal pressure React at 100°C for 4 hours, absorb the gas product in the reaction process with water, add ammonia water with a concentration of 20% to the solid-liquid mixed product obtained from the reaction to adjust the pH to 4, and send it to a plate and frame filter press to filter to obtain Solid 1 and filtrate 1. The suspension obtained after the water absorbs the gas product is centrifuged to obtain solid 7 and filtrate 7, and the filtrate 7 is recycled as a catalyst. The solid 7 is washed with water until the pH is 4, kept at 60°C, and statically precipitated for 2 hours, and then filtered with a filter press Separate and collect the precipitate by filtration, wash the precipitate twice with distilled water and then filter, mix the filter c...

Embodiment 2

[0020] Mix potassium feldspar crushed to 120 mesh with 98% concentrated sulfuric acid and 30% fluosilicic acid in the ratio of 1:0.1:7 by weight in the pre-mixing tank, then flow into the reaction kettle by gravity, and heat under normal pressure React at 120°C for 3 hours, absorb the gas product in the reaction process with water, add ammonia water with a concentration of 20% to the solid-liquid mixed product obtained from the reaction to adjust the pH to 4, and send it into a plate and frame filter press to filter to obtain Solid 1 and filtrate 1. The suspension obtained after the water absorbs the gas product is centrifuged to obtain solid 7 and filtrate 7, and the filtrate 7 is recycled as a catalyst. The solid 7 is washed with water until the pH is 4.5, kept at 70°C, and statically precipitated for 5 hours, and then filtered with a filter press Separate and collect the precipitate by filtration, wash the precipitate twice with distilled water and then filter, mix the filt...

Embodiment 3

[0022]Mix potassium feldspar crushed to 120 mesh with 98% concentrated sulfuric acid and 35% fluosilicic acid in a ratio of 1:1:5 by weight in the pre-mixing tank, then flow into the reaction kettle by gravity, and heat under normal pressure React at 150°C for 3 hours, absorb the gas product in the reaction process with water, add ammonia water with a concentration of 20% to the solid-liquid mixed product obtained from the reaction to adjust the pH to 4, and send it into a plate and frame filter press to filter to obtain Solid 1 and filtrate 1. The suspension obtained after the water absorbs the gaseous product is centrifuged to obtain solid 7 and filtrate 7. The filtrate 7 is recovered and recycled as a catalyst. The solid 7 is washed with water until the pH is 5, kept at 80°C, and statically precipitated for 8 hours, and then filtered with a filter press. Separate and collect the precipitate by filtration, wash the precipitate twice with distilled water and then filter, mix ...

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Abstract

The invention discloses a method for producing a nitrogen phosphorus potassium compound fertilizer with water-insoluble potassium-containing rock. In the method, phosphorus element is supplemented during the treatment process of the potassium-containing rock and the pH values of solution at different stages are seriously controlled to prepare the nitrogen phosphorus potassium compound fertilizer. The method avoids the disadvantages of a low-temperature wet method such as long decomposition time of the potassium-containing rock and high energy consumption, can simultaneously produce aluminium hydroxide, white carbon black, a ammonium potassium sulfate compound fertilizer and sodium metasilicate pentahydrate, and the method has high comprehensive utilization ratio of raw materials, no discharge of waster gas, waste water and waste residues.

Description

technical field [0001] The invention relates to a method for producing nitrogen, phosphorus and potassium compound fertilizers, in particular to a method for producing nitrogen, phosphorus and potassium compound fertilizers by using water-insoluble potassium-containing rocks. Background technique [0002] Potassium-containing rocks can be divided into soluble potassium-containing rocks and insoluble potassium-containing rocks according to their solubility. At present, the main object of development and utilization in the world is soluble potassium salt resources. The utilization of insoluble potassium salt resources is not mature enough. Insoluble potassium salts mainly include Alunite, potassium feldspar, nepheline and potassium-rich marl, etc. Low-temperature decomposition of water-insoluble potassium-containing rocks to produce potassium fertilizers. This method uses the catalysis of fluorine-containing substances to decompose insoluble potassium-containing rocks in conce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C01B33/12C01F11/22C01F11/46C01F7/02C01B33/32
Inventor 薛彦辉
Owner SHANDONG UNIV OF SCI & TECH
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