Process for producing sodium nitrate from soda niter in size-fraction leaching manner

A production process and technology of sodium nitrate, applied in the preparation of alkali metal nitrates and other directions, can solve the problems of low system recovery rate, low brine concentration, large energy consumption for leaching, etc., achieve high leaching yield, reduce water consumption, The effect of reducing energy consumption and investment

Inactive Publication Date: 2012-09-26
CHANGSHA DESIGN & RES INST OF CHEM IND MIN +1
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problems of large water consumption, low brine concentration and low system recovery rate in the heap leaching process, and also to overcome the large energy consumption and large water consumption of sodium saltpeter simple dynamic leaching, which cannot be directly produced Insufficiency of high-concentration brine provides a production process for leaching sodium nitrate in sodium saltpeter in granular grades with low water consumption, high leaching efficiency, high yield, high brine concentration, and low cost

Method used

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  • Process for producing sodium nitrate from soda niter in size-fraction leaching manner
  • Process for producing sodium nitrate from soda niter in size-fraction leaching manner

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Embodiment 1

[0026] This embodiment includes the following steps:

[0027] (1) Ore crushing and screening: the sodium saltpeter ore containing sodium nitrate grade of 4.70% is crushed by a two-stage crushing process, and then sieved to obtain granular ore of 3mm to 40mm and fine ore of 3mm or less;

[0028] The two-stage crushing process is firstly crushed by coarse crushing equipment, and then medium and fine crushing equipment is used for treatment, the coarse crushing equipment is selected as a flange crusher, and the medium and fine crushing equipment is selected as a cone crusher;

[0029] (2) Granular ore leaching: After crushing the 3mm to 40mm ore granules obtained in step (1), the distributing machine for ore granules from 3mm to 40mm is loaded into the leaching tank, and then washed and leached with clean water or processing plant miscellaneous water. The leaching temperature is increased step by step, from room temperature washing to 50℃ leaching; the leaching time of each stage is 9 h...

Embodiment 2

[0040] The difference between this embodiment and Example 1 is: in step (2), the solid-liquid mass ratio of granular ore leaching is controlled to be 1:0.27, and in step (3), fine ore leaching is used 8% of the raw material quality of fine ore is washed with clean water, and the waste residue is NaNO 3 The mass content is 0.85%, efflux; others are the same as in Example 1.

[0041] Compared with the traditional process, this embodiment saves water up to 35% and increases the yield of sodium nitrate by 6%; the concentration of brine in the finished leaching solution reaches 339.2 g / l.

Embodiment 3

[0043] The difference between this embodiment and embodiment 1 is that in step (1), the grade of sodium saltpeter is 7.96%, and in step (2), the mass ratio of solid-liquid leaching of granular ore is controlled to be 1:0.3 , In step (3), in the leaching of fine ore, 8% of the raw material quality of fine ore is used for washing, and the waste residue is NaNO 3 The mass content is 0.87%, efflux; others are the same as in Example 1.

[0044] Compared with the traditional process, this embodiment saves water up to 33% and increases the yield of sodium nitrate by 7%; the concentration of brine in the leaching solution reaches 332.4g / l.

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Abstract

The invention relates to a process for producing sodium nitrate from soda niter in a size-fraction leaching manner. The process comprises the following steps of: (1) crushing and sieving ores; (2) leaching grain ores; (3) leaching ore fines; and (4) carrying out solid-liquid separation on sludge discharged by a spiral classifier of the step (3) by utilizing a plate-and-frame filter press, returning the obtained brine of 110-140g / L to an grain ore leaching pool for carrying out grain ore leaching to further concentrate; and producing mud cake and externally discharging the mud cake. The process for producing the sodium nitrate from the soda niter in the size-fraction leaching manner, disclosed by the invention, has the advantages of low water consumption, high leaching efficiency, high yield, high brine concentration and low cost, and is especially suitable for being applied to seriously hydropenic areas, such as Xinjiang.

Description

Technical field [0001] The invention relates to a production process of sodium nitrate, in particular to a production process of leaching sodium nitrate from sodium saltpeter at a granular level. Background technique [0002] Sodium saltpetre mineral resources are mineral raw materials for the production of sodium nitrate and potassium nitrate. Sodium nitrate and potassium nitrate are basic inorganic chemical products and agricultural fertilizers, which are widely used in various industrial fields and agricultural production fields. Due to the limitation of the provenance of nitrate minerals and mineralization conditions, large-scale nitrate deposits in the world are extremely rare. At present, the world's industrially significant sodium saltpeter resources mainly exist in the Atakama desert in Chile and the Kumtag nitrate deposit in Xinjiang, China. [0003] At present, the leaching process of sodium saltpeter ore in Chile is mainly leaching in leaching tanks, and also using accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/02
Inventor 戴斌联程先明杨灿辉周作琪王有才茆晓宝顾建王新梅张建民
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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