Process for recycling NaNO3 multilevel leaching liquid prepared by saltier ore

A technology of leaching liquid and nitrate ore, which is applied in the direction of alkali metal nitrate, alkali metal compound, inorganic chemistry, etc., can solve the problems of water consumption, low product quality, high production cost, etc., to reduce investment, reduce construction area, The effect of less water consumption

Active Publication Date: 2008-11-19
TURPAN BRANCH OF SINKIANG NITRATE MINERALS +1
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Problems solved by technology

There are two kinds of production process routes: one is that after the ore is leached, the brine is heated and evaporated, and after filtering and separating sodium chloride and sodium sulfate, it is cooled and crystallized to produce sodium nitrate. The disadvantage of this process is high energy consumption, The production cost is high and the product quality is low; the other is the sola

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  • Process for recycling NaNO3 multilevel leaching liquid prepared by saltier ore

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Example Embodiment

[0007] Example 1: The washing liquid after washing the slag is used for leaching the pretreated ore, and the liquid after the leaching liquid undergoes cold precipitation crystallization is returned to the next stage of leaching. The solid precipitate after the cold precipitation crystallization is centrifuged to obtain the primary product and the washing liquid is washed to increase the purity, and the liquid after washing is used for leaching.

[0008] After the saltpeter ore is crushed to a certain particle size (below 2cm in diameter), the solid ore and fine ore are packed into the leaching washing tower together, with NaNO 3 The 350g / l leaching solution is subjected to multi-stage countercurrent leaching at 50℃ in the leaching washing tower to obtain NaNO 3 The 470g / l leaching completed liquid is sent to the low-temperature separation section for cooling to 5°C for salt precipitation, separation, washing, and drying to produce sodium nitrate product. The single pass yield of ...

Example Embodiment

[0010] Example 2: NaNO mined from mines 3 Approximately 20.754 tons of 6% sodium saltpeter, transported by truck to the mine crusher, crushed, sieved, and crushed to a particle size of ≤20mm, and lost 0.042 tons of ore dust, and then handled by a trolley After 20.712 tons of crushed ore is transported to the mobile bucket elevator, the crushed ore is added to the top of the leaching tank by the elevator, and then leached with the leaching solution. Each tank is leached 5 times and washed three times, each tank The first washing liquid is used as the fifth leaching liquid in the next tank, and the last washing is washed with water. With fresh water 3.512m 3 , Washing slag, slag washing liquid 3.65m 3 , Used as leaching liquid. After washing, 19.474 tons of slag are discharged outside. 9.073 tons of leaching completed liquid are subjected to cold precipitation crystallization. After cold precipitation, 6.831 tons of liquid are led back to the next stage of leaching. The solid precip...

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Abstract

The invention relates to a method for recycling multistage leaching solution and washing solution in NaNO3 extraction process by leaching of pretreated sodium nitrate ores. The pretreated sodium nitrate ores are leached, and then the leaching solution is reused in a next stage of leaching process after cold crystallization. Because the leaching solution and other working fluids are recycled, the waste discharge amount is less, even that the product washing solution from the last stage can be normally discharged to a salt field, evaporated, concentrated and recycled. The inventive method takes full use of the washing solution and the cold separation solution; and has the advantages of reduced water consumption, reduced amount of wastewater discharge, reduced amount of tail washings to be discharged to the salt field, reduced construction area of the salt field, reduced investment, reduced production cost, simple process, and easy operation.

Description

1. Technical field [0001] The invention relates to a method for leaching NaNO from pretreated sodium nitrate ore 3 In the composition process, the leaching solution and washing solution recycling technology, especially the preparation of NaNO from sodium nitrate ore 3 Multi-stage leachate recycling process. 2. Technical Background [0002] The development and utilization technology of saltpeter minerals is being paid attention to. The salts in saltpeter minerals are mainly NaNO 3 , NaCl and Na 2 SO 4 etc., are all soluble in water, and their respective solubility in water changes with temperature, such as sodium nitrate NaNO 3 It is widely used as a bulk industrial and agricultural raw material. Sodium nitrate is used as a fertilizer in agriculture, especially for husk crops and root crops, such as sugar beets and radishes. At the same time, it is also a raw material for the manufacture of potassium nitrate, explosives, picric acid, dyes, etc.; it is also used as a def...

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Application Information

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IPC IPC(8): C01D9/00
Inventor 刘利鹏茆晓宝郝建委顾建
Owner TURPAN BRANCH OF SINKIANG NITRATE MINERALS
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