Method for preparing agricultural potassium nitrate by using nitratine and potassium-rich mother liquid

A technology of potassium nitrate and sodium saltpeter, applied in directions such as the preparation of alkali metal nitrate, can solve problems such as restricting the production and development of potassium nitrate, supply restriction, etc., and achieve the effects of easy implementation and promotion, low product cost, and reasonable process design.

Active Publication Date: 2012-03-14
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

Domestic water-soluble potassium ore resources are extremely scarce, and potassium chloride, the main raw material for the production of potassium nitrate, is heavily dependent on imports. The other main ra...

Method used

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  • Method for preparing agricultural potassium nitrate by using nitratine and potassium-rich mother liquid
  • Method for preparing agricultural potassium nitrate by using nitratine and potassium-rich mother liquid
  • Method for preparing agricultural potassium nitrate by using nitratine and potassium-rich mother liquid

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Embodiment

[0027] Such as figure 1 As shown, it is required to grind the sodium nitrate powder to -200 mesh, concentrate to obtain a concentrated sodium nitrate solution (concentration is 200g / L, density is 1.24kg / L) after water extraction, and the concentration of potassium carbonate in the potassium-rich mother liquor is 650g / L, the density is 1.58kg / L. The above solution was made into a raw material solution according to the mass ratio of potassium carbonate and sodium nitrate of 0.7:1, and the density was 1.3kg / L. The raw material solution was heated and evaporated to boiling for 1 hour at a temperature of 105°C, and the precipitate was centrifuged to obtain filter cake I of sodium carbonate and mother liquor of potassium nitrate. Put the mother liquor of potassium nitrate into an ice-water bath to cool and crystallize, centrifugally filter the precipitate and dry at 120°C for 0.5 hour to obtain potassium nitrate products, which meet the requirements of the national standard for ag...

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Abstract

The invention discloses a method for preparing agricultural potassium nitrate by using nitratine and potassium-rich mother liquid. The method comprises the following steps: crushing and grinding potassium-rich rocks to prepare raw ore powder, sintering, water leaching, silicon removing, sodium removing to obtain the potassium-rich mother liquor which takes potassium carbonate as a main component, mixing with a sodium nitrate solution obtained by extracting and concentrating nitratine ore powder through water to obtain raw material liquid, high temperature evaporating and crystallizing, forming a potassium-rich solution and a sodium carbonate filter cake, filtering and separating, recrystallizing the sodium carbonate filter cake, filtering deposition and drying to obtain an industrial superior sodium carbonate product, recrystallizing filtrate to raw material liquid for circular utilization. The potassium nitrate crystal is precipitated by cooling and crystallizing the potassium-rich solution, and is centrifuged and dried to an agricultural superior potassium nitrate product. The residual solution is cooled and crystallized to the raw material liquid for circular utilization.

Description

technical field [0001] The invention relates to a method for preparing agricultural potassium nitrate by utilizing sodium saltpeter and water-insoluble potassium-rich rock. Background technique [0002] my country is a large agricultural country, and the demand for non-chlorine-based potassium fertilizer potassium nitrate is large. Domestic water-soluble potassium ore resources are extremely scarce, and potassium chloride, the main raw material for the production of potassium nitrate, is heavily dependent on imports. The other main raw material, ammonium nitrate, is listed as hazardous explosives under strict management, so its supply is strictly restricted, which severely restricts the production of nitric acid. Potassium production development. At the same time, my country's agricultural deep-level reform has begun, and the adjustment of agricultural product structure has put forward higher requirements for the quality and quantity of potassium nitrate products. The domes...

Claims

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Application Information

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IPC IPC(8): C01D9/02
Inventor 马鸿文刘梅堂刘艳红
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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