Process for extracting KCl coarse grains by carrying out flotation on solid sylvinite primary ores

Abstract

The invention discloses a process for extracting KCl coarse grains by carrying out flotation on solid sylvinite primary ores, comprising the following steps; (1) crushing the solid sylvinite primary ores; (2) carrying out coarse grinding on the crushed sylvinite; (3) feeding the sylvinite material subject to coarse grinding into a flotation machine for primary rougher flotation and secondary refined flotation; and (4) filtering and drying concentrates obtained by the secondary refined flotation, thus obtaining the high-quality KCl bulky grain product. The product is purely white and transparent; the average grain size is 1mm-2mm; and the KCl grade is not less than 90% (by weight), thus exceeding the common industrial and agricultural high-class KCl product standards of class-II and class-III and reaching the special industrial KCl standard of national standard GB6549-1996I.

Description

Technical field [0001] The invention relates to a process for preparing KCl potassium fertilizer using potash resources, in particular to a process for extracting coarse-grained KCl potassium fertilizer by flotation of solid potash salt primary ore. Background technique [0002] At present, most of the production of KCl in my country is through salt lake beach sun-dried brine to make carnallite, which is then made by decomposition and flotation. However, the potassium mixed salt crystal grain size obtained by the salt lake beach itself is relatively fine, and It has gone through the decomposition process of carnallite, which is equivalent to the dissolution and recrystallization of the particles, so the KCl particles obtained are very fine and basically powdery. However, in the agricultural potash fertilizer market, the more coarse-grained potash fertilizer has a better sales effect. The reason is that the powdered potash fertilizer is easily blown away by the wind during the fert...

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Problems solved by technology

In foreign countries, there are three processes for producing coarse-grained potassium fertilizer: one is the roller extrusion process that uses the powdered potassium fertilizer produced in salt lakes as raw material for secondary processing, that is, the granulator in the potash fertilizer production equipment is used for granulation, so that the powder The disadvantage of this process is that the produced potash fertilizer product particles are not firm, the particle size is small, the production process is long, the energy consumption is high, and the cost is high; the second is the dissolution and crystallization process, that is, the potassium salt is dissolved The method of recrystallization makes the potassium fertilizer particles grow up. The disadvantages of this method are large investment in equipment, high energy consumption, and poor economic benefits; the third is to use underground high-quality solid potassium halite for crushing or coarse flotation to produce coarse particles Potassium fertilizer, coarse-grained flotation uses octadecylamine and petroleum by-products as auxiliary collectors for flotation. Before flotation KCl, formaldehyde and urea need to be added to suppress the slime. The advantages of this method are low production cost and large potassium fertilizer particles, but The disadvantage is that formaldehyde urea contains formaldehyde, which pollutes the environment more

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