Technique for producing sodium nitrate by chilisaltpeter adverse current circulation leaching

A technology of countercurrent circulation and sodium nitrate, which is applied to the preparation of alkali metal nitrate, etc., can solve the problems of high energy consumption, large water consumption, and low concentration of sodium nitrate, etc., and achieve short process flow, low production cost and simple operation Effect

Active Publication Date: 2010-03-24
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] Embodiment 1: take countercurrent circulation leaching process, specifically comprise the following steps:

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

[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 into the countercurrent leaching column from the high level tank through the bottom until the liquid level submerges the ore surface, and the leaching brine stays in the column for 10 hours; then the leaching brine containing 355g / L sodium nitrate Also after heating to 45°C, inject the countercurrent leaching column from the high level tank through the bottom, and flow the concentrated leaching solution that has stayed for 10 hours from the upper overflo...

Embodiment 2

[0016] Embodiment 2: take countercurrent circulation leaching process, specifically comprise the following steps:

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

[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 into the countercurrent leaching column from the high level tank through the bottom until the liquid level submerges the surface of the ore, and the leaching brine stays in the column for 8 hours; then the leaching brine containing 365g / L sodium nitrate Also after heating to 65°C, inject the countercurrent leaching column from the high level tank through the bottom, and flow the concentrated leaching solution that has stayed for 8 hours from the upper ov...

Embodiment 3

[0021] Embodiment 3: The preferred embodiment is: (1) ore crushing: Sodium nitrate ore is crushed into particles with a particle size of less than or equal to 5cm; (2) countercurrent circulation leaching: the broken ore is packed into a countercurrent leaching column, and The height-to-diameter ratio of the column 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, the energy provided by the head tank or pump enters from the bottom of the countercurrent leaching column, and then It flows out from the upper overflow tank of the countercurrent leaching column, and after 3-4 stages of countercurrent cyclic leaching, the content of sodium nitrate in the leaching solution will rise from 300 to 380g / L to 390 to 500g / L. (3) Low-temperature separation, washing, and drying: After the leaching completion liquid is cooled by heat exchange with the low-temperature separation mother liquid, the temperatu...

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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 notlarger 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 bylow-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 production process of sodium nitrate, in particular to a process for producing sodium nitrate with sodium nitrate. 2. Background technology: [0002] Sodium nitrate is a colorless transparent or light yellow rhombic crystal, which can be used as chemical analysis reagent, oxidant, chemical fertilizer, 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 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 nitrate to process and produce sodium nitrate is based on the saltpeter ore containing relatively high sodium nitrate, and the content is even more than 60%. In this case, water can be directly added to the ore for leaching. The sodium nitrate pro...

Claims

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Application Information

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Patent Type & Authority Patents(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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