Method for producing potassium nitrate by chilisaltpeter ore transformation process

A technology of sodium nitrate ore and potassium nitrate, which is applied in the field of producing potassium nitrate by using the conversion method of sodium nitrate ore, can solve the problems of large investment in the construction of beach-dried salt fields, large process water consumption, and low concentration of sodium nitrate, so as to save investment and simplify Process flow and high energy efficiency utilization

Inactive Publication Date: 2008-05-14
TURPAN BRANCH OF SINKIANG NITRATE MINERALS
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  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is suitable for low-grade sodium saltpeter mines, the water consumption of the process is relatively large, and the wind is greatly affected during spraying and leaching. The energy consumption is high when refining and producing sodium nitrate in the workshop

Method used

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  • Method for producing potassium nitrate by chilisaltpeter ore transformation process

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Embodiment 1

[0023] The method for producing sodium nitrate with sodium nitrate ore, its refinement processing step is

[0024] 1. Ore crushing: Sodium nitrate ore is crushed with a jaw crusher, and the particles with a particle size of ≤2cm are screened and loaded into the leaching tank.

[0025] 2. Five-stage countercurrent circulation leaching: the washing mother liquor enters five-stage countercurrent circulation leaching, the first stage is the fifth leaching of ore, the second stage is the fourth leaching of ore, and so on, the temperature of the leaching solution is graded As the concentration increases, the concentration of the washing liquid also increases step by step, and the leaching completion liquid is obtained. The leaching time of each level is 10h.

[0026] 3. Three-stage washing: use 0.5 times the weight of the ore to wash the ore after five-stage leaching step by step, and the washing sequence is the first stage, the second stage, and the third stage. Wherein the first...

Embodiment 2

[0040] The present embodiment has the same processing steps as Embodiment 1, and only differs in some process parameters, as follows:

[0041] 1. Ore crushing: crush the ore to particles with a particle size of ≤2cm, and put them into the leaching tank.

[0042] 2. Five-stage countercurrent circulation leaching: the washing mother liquor enters five-stage countercurrent circulation leaching, the first stage is the fifth leaching of ore, the second stage is the fourth leaching of ore, and so on, the leaching temperature is at room temperature ~ 50°C and increasing step by step, the concentration of the washing solution also increases step by step, and the leaching complete solution is obtained. The leaching time of each level is 8h.

[0043] 3. Three-stage washing: use 0.5 times the weight of the ore to carry out step-by-step washing, and the washing sequence is the first stage, the second stage, and the third stage. Wherein the first stage is the third washing of the ore, the ...

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Abstract

The invention provides a transformation method for preparing potassium nitrate via nitratite, which adopts the technology steps that the ore is crushed until the grinding diameter is below 2cm, and multilevel counterflow heat immersed making the content of NaNO3 equal and more than 450g / l; potassium chlorate is added for heat transformation; four-effect evaporation is applied for brine evaporation and saline miner degree after degree, making the content of KNO3 equal and more than 800g / l; finished product potassium nitrate is obtained through three level vacuum cold crystallization, centrifugal detach and then drying. The nitrate recovery yield of the invention is above 75%, the potassium recovery yield is above 85%. The invention has the advantages of simplifying the technological process, saving investment cost, having high power-efficiency utilization ratio, and being suitable for low grade soda-nitre mine coal mining.

Description

1. Technical field [0001] The invention relates to a production method of industrial potassium nitrate, in particular to a method for producing potassium nitrate by using a sodium nitrate ore conversion method. 2. Background technology [0002] Potassium nitrate, also known as potassium nitrate, is a white powder or rhombohedral crystal, with a cold and pungent taste, unpurified to yellow, good physical properties, neutral, melting point 334 ° C, decomposed at 400 ° C Oxygen, soluble in water, insoluble in absolute ethanol and ether. It has low hygroscopicity and is not easy to deliquesce and agglomerate in the air. It is a strong oxidant and can cause combustion and explosion when it comes in contact with combustibles and organic substances. Industrial potassium nitrate is mainly used in the manufacture of black gunpowder, fireworks, fuses, ceramic glazes, glass clarifiers, match products, fertilizers, reagents, glass, metallurgy, oxidants, food preservation, medicine, col...

Claims

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Application Information

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IPC IPC(8): C01D9/14
Inventor 茆晓宝戴斌联陈伟来贺其华王有才龚增德
Owner TURPAN BRANCH OF SINKIANG NITRATE MINERALS
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