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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  • Application Information

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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 solar evaporation process, that is, the ore is crushed, leached, the brine is sent to the salt pan for solar evaporation, and the coarse salt obtained after separation is sent to the finishing workshop to produce sodium nitrate. The advantages of this process route are Make full use of solar energy, and is conducive to the development and utilization of low-grade ore, but consumes a lot of water
At present, the more advanced technology is to leach and cold-precipitate NaNO from the treated saltpeter ore. 3 The initial product, and because the leaching and washing processes generally require a large amount of water consumption, and there is still a large impact on the environment after the complex treatment evolution is performed, the discharge of production wastewater will still cause a large impact on the environment. question

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

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Embodiment 1

[0007] Example 1: After washing the slag, the lotion is used for leaching the pretreated ore, and the leaching solution is returned to the next level of leaching after being cooled and crystallized. The solid precipitate after cold crystallization is centrifuged to obtain the primary product, which is washed with lotion to improve the purity, and the washed liquid is used for leaching.

[0008] After the saltpeter ore is crushed to a certain particle size (below 2cm in particle size), the solid ore and fine ore are loaded into the leaching and washing tower together, and the NaNO-containing 3 The 350g / l leaching solution is leached in a leaching scrubber at 50°C in multi-stage countercurrent leaching to obtain NaNO-containing 3 The 470g / l leaching 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 products. The single-pass yield of cold analysis is 25-32%, and the product...

Embodiment 2

[0010] Embodiment 2: Containing NaNO from mining 3 20.754 tons of sodium saltpeter with about 6% is transported by truck to the mine crushing site and crushed-screened-crushed to a particle size of ≤20mm by a truck, and 0.042 tons of ore dust is lost. The final crushed ore 20.712 tons is transported to the mobile bucket elevator, and the crushed ore is added to the top of the leaching tank through the elevator, and then leached with the leaching solution. Each tank is leached 5 times and washed three times. The first washing solution is used as the fifth leaching solution in the next tank, and the last washing is washed with clean water. Take fresh water 3.512m 3 , washing slag, slag washing liquid 3.65m 3 , used as a leaching solution, 19.474 tons of slag was discharged after washing, 9.073 tons of the leaching completed liquid was subjected to cold crystallization, and 6.831 tons of the liquid after cold analysis was brought back for the next level of leaching, and the sol...

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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...

Claims

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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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