CN1724374A

CN1724374A - Process for producing soft potassium magnesium vanadium

Info

Publication number: CN1724374A
Application number: CN 200510085831
Authority: CN
Inventors: 杨建元; 夏康明; 吴强
Original assignee: Qinghai CITIC Guoan Technology Co Ltd
Current assignee: Qinghai CITIC Guoan Lithium Industry Development Co Ltd
Priority date: 2005-07-17
Filing date: 2005-07-17
Publication date: 2006-01-25
Anticipated expiration: 2025-07-17
Also published as: CN1288084C

Abstract

A process for preparing soft KMgV from the mixed K salt generated by sunning the sulfate-type bittern includes such steps as breaking, sieving, stage-one converting, mechanical separation of sodium chloride, stage-two converting, and drying. Its advantages are high output rate and high purity of product.

Description

The production method of schoenite

One, technical field:

What the present invention relates to is that the potassium mixed salt that a kind of vitriolate type bittern solarization is made is the Technology of raw material production schoenite, belongs to the salt chemical engineering technical field.

Two, background technology:

The chemical formula of schoenite is: MgSO ₄K ₂SO ₄6H ₂O is a kind of fertilizer that nutrients such as necessary potassium, magnesium, sulphur can be provided for plant growth, becomes potash magnesium sulphate fertilizer.Its raw material potassium mixed salt system gets from vitriolate type bittern evaporation Exposure to Sunlight, is the mixture of mineral such as a kind of sylvite, carnallitite, kainite, epsom salt, halite.The production technique of comparative maturity is divided four classes in the world at present: (1) flotation process: magnesium sulfate salt type bittern shines the potassium ores of making and forms slurry through ore grinding after taking off sodium, conversion, flotation, dehydration obtain schoenite.This method shortcoming is that flotation reagent is arranged in the product, and the pattern of product is a powdery.(2) saltpan method: this method be by salt field process with the potassium mixed salt be dissolved in water, evaporative crystallization, separating and dehydrating obtain potash magnesium sulphate fertilizer.This method shortcoming is that water consumption is big, foreign matter content is high.(3) water-soluble method: this method is that bittern evaporation is obtained potassium magnesium mixed salt, and water is handled potassium magnesium mixed salt at twice, and the fs, its amount of water was 15～30% of a potassium magnesium mixed salt weight when adding water treatment, and temperature is-2 ℃～30 ℃; When subordinate phase adds water treatment, be performed until potassium magnesium mixed salt and dissolve fully, separate water-insoluble, and when temperature-2 ℃～2 ℃, go out schoenite by the gained solution crystallization.This method weak point is twice water treatment, and the single transformation efficiency of potassium is lower, be 27%～43%, and operating process is more loaded down with trivial details.(4) machinery takes off sodium, two sections conversion methods: Chinese invention patent ZL03157856.x provides a kind of production technique of potash magnesium sulphate fertilizer, belong to an applicant together with the present invention, the halite mineral granularity is obviously greater than the feature of the newly-generated sylvite mineral granularity of one section conversion procedure in this technology utilization potassium ores stone, mechanical means separates sodium-chlor, utilizes two sections to transform the production schoenite.

Three, summary of the invention

The objective of the invention is on existing patent " a kind of production technique of potash magnesium sulphate fertilizer; Chinese invention patent ZL03157856.x " basis, to improve the novel process of finishing, belong to the methods that a kind of potassium mixed salt that utilizes vitriolate type bittern to shine system is produced schoenite for raw material by mechanical separation sodium-chlor, two sections conversions, with the difference of existing patent is that one section conversion separates ore pulp behind the sodium-chlor and need not filter and directly enter two sections conversions, reduced facility investment, reduced production cost, can realize by following approach.

The production method technical process of this schoenite is one section conversion of crushing and screening, potassium mixed salt of potassium ores, the mechanical separation of sodium-chlor, two sections conversions of material, the drying of schoenite; Its processing condition are: the crushing and screening of potassium ores, vitriolate type bittern shine fragmentation, the screening of the potassium ores of system and sieve with 2～10 purpose standard sieves, enter one section conversion reaction; One section conversion of potassium mixed salt adds two sections conversion fluids of potassium 0.2～0.3 times of fresh water of mixed salt quality or 0.3～0.45 times, reacts under 35～55 ℃ temperature condition 1～2.5 hour; The mechanical separation of sodium-chlor: one section conversion reaction material is poor according to the granularity of sodium-chlor and other valuable mineral, utilize most of sodium-chlor in the mechanical process separation of material, mechanical process can adopt the method for hydraulic classification or screening, one section transforms slip and be incubated 50～70 mesh standard sieves under 35 ℃-55 ℃ temperature condition, screen overflow is that sodium-chlor discards, and screen underflow directly enters two sections conversions for containing sylvite ore material slurry; Two sections conversions of material: the fresh water that adds 0.3～0.8 times of potassium ores quality through the slip behind the separation sodium-chlor carries out two sections conversions at normal temperatures, transformation time is 0.6～1.5 hour, get two sections conversion fluids behind two sections conversion slurry filtrations and return one section conversion, filter cake enters dry workshop section; The drying of schoenite: wet schoenite utilizes modes such as pneumatic drier, revolving drum drying machine, vibrated fluidized bed to carry out drying under the condition of 50～70 ℃ of temperature of charge.

Present method combines the advantage and the material characteristic of prior art, particularly in one section conversion reaction according to the difference of reaction mass in granularity, solved with simple mechanical separation means and to have taken off this great difficult problem of sodium, improved the potassium yield from another point of view, one section transforms slip and does not need solid-liquid separation directly to enter two sections conversions.Make product granularity obtain increasing by two sections conversions, be more conducive to crop absorption, improved the useful component utilization ratio, and do not contained farm crop objectionable impuritiess such as flotation agent, sodium salt in the product.

Four, embodiment

Embodiment one: the potassium mixed salt that shines system with vitriolate type bittern is broken for thinner particle with mechanical means, sieve with the standard sieve about 2 orders, screen overflow returns again broken, screen underflow enters one section conversion, one section transforms adding potassium 0.20 times of fresh water of mixed salt quality or adds two sections conversion fluids of 0.3 times, reacted 1 hour down at 35 ℃, the mechanical separation of sodium-chlor is incubated down at 35 ℃ and sieves with the standard sieve about 50 orders, screen underflow enters two sections conversions, two sections transform the fresh water normal temperature that adds 0.3 times of potassium mixed salt quality and transform 0.6 hour down, filter filter cake, the temperature of charge of the drying process of schoenite is 50 ℃, removes excessive moisture with the pneumatic drier drying and promptly gets product.

Embodiment two: the raw material crushing that still adopts embodiment one is a fine particle, sieve with the standard sieve about 10 orders, screen overflow returns broken again, screen underflow enters one section conversion, one section two sections conversion fluid that transform to add potassium 0.30 times of fresh water of mixed salt quality or 0.45 times, reacted 2.5 hours down at 55 ℃, the mechanical separation of sodium-chlor is incubated down at 55 ℃ and sieves with the standard sieve about 70 orders, two sections transform the fresh water normal temperature that adds 0.8 times of potassium mixed salt quality and transform 1.5 hours down, the temperature of charge of the drying process of schoenite is 70 ℃, promptly gets product with flash dryer.

Claims

1, a kind of production method of schoenite, the technological process that it is characterized in that it are one section conversion of crushing and screening, potassium mixed salt of potassium ores, the mechanical separation of sodium-chlor, two sections conversions of material, the drying of schoenite; Its processing condition are that the crushing and screening of potassium ores sieves with 2～10 purpose standard sieves, one section conversion procedure of potassium mixed salt adds two sections conversion fluids of potassium 0.20～0.30 times of fresh water of mixed salt quality or 0.30～0.45 times, under 35～55 ℃ temperature condition, reacted 1～2.5 hour, the mechanical separation of sodium-chlor is with the method for hydraulic classification or screening, the temperature of slip is 35 ℃～55 ℃, two sections fresh water that transform 0.3～0.8 times of slip adding potassium ores quality of material carry out two sections conversions at normal temperatures, transformation time is 0.6～1.5 hour, and the temperature of charge of the drying process of schoenite is 50～70 ℃.