Technique for producing sodium nitrate by chilisaltpeter adverse current circulation leaching

A countercurrent circulation, sodium nitrate technology, applied in the preparation of alkali metal nitrates and other directions, can solve the problems of large water consumption, high energy consumption of sodium nitrate, low concentration of sodium nitrate, etc., and achieves low production cost, short technological process, and simple operation. Effect

Active Publication Date: 2008-04-30
TURPAN BRANCH OF SINKIANG NITRATE MINERALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water consumption of this process is still relatively large, and the wind is greatly affected during spraying and leaching, the concentration of sodium nitrate in the leaching solution is low, the investment in the construction of beach-dried salt fields is relatively large, and the energy consumption for producing sodium nitrate from salt field semi-finished products is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Adopting the countercurrent circulation leaching process, specifically including the following steps:

[0011] (1) Crush the sodium saltpetre ore with a sodium nitrate content of 6% with a jaw crusher to particles with a particle size of ≤5cm;

[0012] (2) Pack the crushed ore into a countercurrent leaching column with a height-to-diameter ratio of 5, until the ore is flush with the top of the leaching column, and heat the prepared leaching brine containing 355g / L of sodium nitrate to 45 After ℃, the leaching brine is injected from the high tank through the bottom into the countercurrent leaching column until the liquid level floods the surface of the ore. The leaching brine stays in the column for 10 hours; then the leaching brine containing 355g / L sodium nitrate After the same heating to 45°C, inject the countercurrent leaching column from the upper tank through the bottom, and flow the leaching concentrate that stayed for 10 hours from the upper overflow tank ...

Embodiment 2

[0016] Example 2: Adopting the countercurrent circulating leaching process, specifically including the following steps:

[0017] (1) Crush the sodium saltpetre ore with a sodium nitrate content of 6% with a jaw crusher to particles with a particle size of ≤5cm;

[0018] (2) Pack the crushed ore into a countercurrent leaching column with a height-to-diameter ratio of 3 until the ore is flush with the top of the leaching column, and heat the prepared leaching brine containing 365g / L of sodium nitrate to 65 After ℃, the leaching brine is injected from the high tank through the bottom into the countercurrent leaching column until the liquid level submerges the surface of the ore. The leaching brine stays in the column for 8 hours; then the leaching brine containing 365g / L sodium nitrate After the same heating to 65°C, inject the countercurrent leaching column from the upper tank through the bottom, and flow the leaching concentrate that stayed for 8 hours from the upper overflow tank ...

Embodiment 3

[0021] Example 3: The preferred implementation is: (1) Ore crushing: crushing sodium saltpeter ore into particles with a particle size of ≤ 5cm; (2) Countercurrent cyclic leaching: The crushed ore is loaded into a countercurrent leaching column, and then leached. The column height to diameter ratio should be in the range of 1 to 5, preferably 3 to 4. After the adjusted low-temperature separation mother liquor is heated to 45°C to 60°C, its energy is supplied from the bottom of the countercurrent leaching column by a high tank or pump, and then From the overflow tank on the upper part of the countercurrent leaching column, after 3-4 stage countercurrent leaching, the content of sodium nitrate in the leaching solution will rise from 300~380g / L to 390~500g / L. The leaching at this time The liquid is the finished leaching solution; (3) Low-temperature separation, washing, and drying: After the finished leaching solution is cooled by heat exchange with the low-temperature separation mot...

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Abstract

The invention relates to a process for producing sodium nitrate by using nitratine reverse-flow circulation extraction, which comprises steps as follows: (1) breaking ores into the grains smaller not larger than 5cm, (2) reverse-flow circulation leaching: after 2-6 stages of reverse-flow circulation immerge, the sodium nitrate content of extraction solution is increased from 300-380g/l to 390-500g/l, (3) separating, washing and drying at low temperature that exchanges heat between the extraction solution and low-temperature separation mother liquid, to reduce temperature, mixing and reducing temperature to -10-20DEG C, and keeping temperature for 100-140min, separating solid and liquid, filtering and washing via a saturated sodium nitrate, according to the mass ratio between product and sodium nitrate solution as 6/1-5/1, then drying to obtain sodium nitrate product, and feeding the separated mother liquid into the step (2), to process next circulation. The invention can save water more than 40%, and save energy more than 25%, while the single-process collecting rate is more than 25% and the total collecting rate of sodium nitrate in ore is more than 95.0%. The product obtained by low-temperature separation contains sodium nitrate more than 92%, and the washed product contains sodium nitrate more than 98%. The invention can use low-grade nitratine mine to produce sodium nitrate.

Description

1. Technical Field: [0001] The invention relates to a process for producing sodium nitrate, in particular to a process for producing sodium nitrate from sodium saltpeter. 2. Background technology: [0002] Sodium nitrate is colorless, transparent or light yellow rhombus crystals, which can be used as chemical analysis reagents, oxidants, chemical fertilizers, fireworks, nitric acid, dye synthesis, etc. It is mainly used in the manufacture of potassium nitrate, explosives, picric acid and other nitrates. It is also widely used in the glass industry, enamel industry, dye industry, pharmaceutical industry and agriculture. It is an important inorganic chemical raw material. [0003] In the known technology, the process of directly using sodium saltpeter to produce sodium nitrate is based on the saltpeter ore with high sodium nitrate content, and the content is even more than 60%. In this case, the ore can be directly leached with water, and then the brine Sodium nitrate product can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/02
Inventor 汤建良唐必武贺其华黄银广刘利鹏茆晓宝郝建委顾建
Owner TURPAN BRANCH OF SINKIANG NITRATE MINERALS
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