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Counterflow circulation washing extraction method by using nitratine

A technology of countercurrent circulation and extraction method, applied in alkali metal nitrate purification, alkali metal sulfite/sulfate purification, alkali metal halide purification, etc., can solve the problem of large water consumption, low leaching brine concentration and low leaching rate and other problems to achieve the effect of reducing waste, short cycle and high leaching rate

Inactive Publication Date: 2013-02-06
冯耀礼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the operation process of this method, there are mainly problems such as large water consumption, low concentration of leaching brine, strict requirements on the soil structure of the lower layer of sodium nitrate mine, and low leaching rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention is a kind of countercurrent circulation washing extraction method utilizing sodium saltpeter, comprising the following steps:

[0027] (1) Sodium saltpeter ore with a block size of <400mm is piled into a heap leaching tank for soaking. The heap leaching tank is built in the ore mining area, and local materials are used. The specification length×width is 45m×45m, and the height is 1.5m. And the inside of the heap leaching tank is equipped with waterproof HDPE to prevent seepage. And keep stirring to make the ore soak evenly. With the continuous soaking and stirring, the ore grade in the ore pile will continue to decline, and the soaking period is ≥ 120 hours; depending on the dissolution of the ore, the specific soaking time is determined;

[0028] (2) When the average content of NaNO3 in the ore leaching slag is less than or equal to 0.6%, stop soaking and stirring, remove the soaking solution, wash and filter with clean water, discharge the leachi...

Embodiment 2

[0032] A kind of countercurrent circulation washing extraction method utilizing sodium saltpeter, comprises the following steps:

[0033] (1) Spray and wet the sodium saltpeter ore with a block size of <400mm in situ, the ratio of water to ore is 1:3, and the wetting time is ≥12 hours;

[0034] (2) Pulverize the wet ore, and the wet ore enters the water mill for pulverization. Then the grinded material is separated into the washing separator, and the slag is washed and filtered and discharged to the waste residue yard, and the filtrate and the separated solution are recycled into the washing separator;

[0035] (3) Along with washing, the brine concentration improves constantly, and when the brine concentration NaNO3 content ≥ 18%, it is pumped into the evaporation pool for evaporation, concentrated and separated out sodium chloride crystals, sodium sulfate crystals;

[0036] (4) As the evaporation proceeds, the brine concentration increases continuously. When the brine conce...

Embodiment 3

[0038] The present embodiment differs from embodiment 2 in that the ore wetted in step (2) enters the crusher for pulverization, and other features are the same as those in embodiment 2, so no further details are given.

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PUM

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Abstract

The invention relates to a counterflow circulation washing extraction method by using nitratine, comprising the following steps: (1) stacking nitratine ores with the lumpiness of smaller than 400mm in a dump leaching pool for soaking, and continuously stirring, wherein the soaking period is larger than or equal to 120h; (2) when the average content of NaNO3 in the soaking slag of ores is smaller than or equal to 0.6%, stopping soaking and stirring, discharging soaking solution, discharging the soaking slag in a spoil area after clear water is filtered and washed, then stacking the ores again and carrying out the next round of washing and stirring by using the soaking solution; (3) when the content of NaNO3 in leach liquor is larger than or equal to 12%, pumping in an evaporation pond for evaporation, and concentrating to precipitate sodium chloride crystal and sodium sulfate crystal; and (4) when the concentration of bittern is continuously improved till the content of NaNO3 is larger than or equal to 20%, concentrating the bittern into a half-finished product which is a mixed crystal of sodium nitrate, sodium sulfate, sodium chloride and darapskite. The method is high in leaching rate, low in cost, short in cycle and high in yield, and is capable of efficiently utilizing resources and reducing the waste of resources.

Description

technical field [0001] The invention relates to an extraction method, in particular to a method for extracting sodium chloride crystals, sodium nitrate crystals and sodium sulfate crystals by using sodium saltpetre countercurrent circulation washing. Background technique [0002] Sodium nitrate ore can be processed to produce natural high-quality sodium nitrate and potassium nitrate. This product is in short supply in my country and the world. Regardless of added value and function, it is better than potassium sulfate and potassium chloride. It is a scarce high-quality green potassium fertilizer. It is a binary green fertilizer that is in short supply in the world. At present, the leaching methods for sodium saltpeter ore at home and abroad mainly include heap leaching, percolation leaching, screw conveying dynamic leaching, surface spray leaching, etc., each of which has advantages and disadvantages. [0003] The heap leaching method is to stack the sodium nitrate ore crush...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D5/16C01D9/16
Inventor 冯耀礼
Owner 冯耀礼
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