Method for dynamically dissolving and preparing nitratine ore leaching solution

Abstract

The invention provides a method for dynamically dissolving and preparing a nitratine ore leaching solution. The method comprises the following steps of: firstly introducing water in a reaction device, then feeding; adopting dynamic dissolution and leaching, the diameter of the fed ore particles being within 2cm, when the feeding starts, a coulter device in the reaction device beginning to run, a running speed being 1r / min, the feeding amount being 6kg / min, a total water solid mass ratio of the water inflow being kept within 1:3 to 1:4, lifting produced brine by using a self-priming pump, entering into a condensed brine barrel; extracting residues after leaching liquid, spirally exhausting from bottom of the reaction bottom, a coulter cutting when rotating, the coulter bringing the materials in a spiral outlet, the cutting amount being 6mm / min, lifting the condensed brine by using the self-priming pump, leaving diluted brine, and leaching tailings. The leaching tailings are charged simply and directly, the leaching yield is high, and the period is short. It is easy to exhaust the residues. The production water is recycled and is saved. The resource use ratio is improved. The method for dynamically dissolving and preparing the nitratine ore leaching solution realizes no-emission of the production waste water, especially suitable for 4-5% low grade ore fines or serious water-deficient area. The principle is simple and is easy to implement.

Description

technical field [0001] The invention relates to a compound method of CO1D alkali metal in the international patent classification, especially a method for preparing by dynamic dissolution of sodium nitrate ore leaching liquid. Background technique [0002] In the known technology, the salt in sodium nitrate ore is mainly NaNO 3 , NaCl and Na 2 SO 4 etc., are easily soluble in water, and the solubility of these salts in water changes with temperature, among them, NaNO 3 The solubility of Na increases significantly with the increase of temperature. 2 SO 4 The solubility is maximum at 32.38°C, at <32.38°C, it increases with the increase of temperature, after >32.38°C, Na 2 SO 4 The solubility decreases with the increase of temperature; at the same time, the solubility of NaCl does not change much with the increase of temperature. [0003] Sodium nitrate NaNO 3 As a bulk raw material, it is widely used in many fields of industry and agriculture. [0004] At presen...

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Problems solved by technology

[0011] Among the disclosed technologies including the aforementioned, they can be basically divided into two commonly used processes, but there are deficiencies, especially the low extraction efficiency of the leaching solution. The sodium nitrate product is obtained by spreading and concentrating in salt fields, and then sent to the evaporation workshop for finishing processing to obtain sodium nitrate products. This process can make full use of natural solar energy resources, but the disadvantages are low resource recovery rate and high water consumption, so it is not suitable for use in water-deficient and windy areas; another process Sodium nitrate ore is crushed and screened to produce lump ore, then leached in multi-stage variable temperature pools to prepare brine, and the brine is evaporated and granulated to produce sodium nitrate products, or leached to produce 450g / l high-concentration brine, which is directly subjected to cold crystallization and separation to produce nitric acid Sodium, although the water is recycled, the water consumption is low, but the energy consumption is high, and the cold precipitated product needs to be refined

However, the better process improvement technology that is badly needed has not yet been disclosed.

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