CN100383044C

CN100383044C - Method for producing carnallite in low sodium or potassium chloride by using brine of containing potassium

Info

Publication number: CN100383044C
Application number: CNB2005100892103A
Authority: CN
Inventors: 魏新俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-25
Filing date: 2005-07-25
Publication date: 2008-04-23
Anticipated expiration: 2025-07-25
Also published as: CN1872686A

Abstract

The present invention belongs to the technical field of salt chemical industry, particularly to a method for producing carnallite in low sodium or potassium chloride by using brine of containing potassium. The method is characterized in that the technological process comprises five working procedures: the preparation of potassium saturated liquid, bittern addition, potassium separation, sieving and sodium removal, the washing of carnallite, the cold decomposition of carnallite, filtration and drying. After the washing working procedure of the carnallite, a low-sodium carnallite product of solid can be obtained; after bittern addition, potassium separation, sieving and sodium removal, the cold decomposition of the carnallite is carried out with fresh water, and after the processing of two working procedures, such as filtration and drying, a potassium chloride product is obtained. The method removes the sodium chloride of fine particles in bittern addition ore slurry by a sieving method, and accordingly, a large amount of device investment can be saved; energy consumption loads of the device is reduced; production cost is greatly reduced; the two alternative products can obtain high profit; the product added value is greatly increased, and the method has obvious economic benefit.

Description

Produce the method for low-sodium carnalite or Repone K with containing potassium bittern

One, technical field

The present invention relates to a kind of utilization and contain the method that potassium bittern is produced low-sodium carnalite or Repone K, belong to the salt chemical engineering technical field.

Two, technical background

Low-sodium carnalite can be used as the raw materials for production of dehydration carnallitite, also can be used as the raw materials for production of Repone K.Its production method mainly contains two kinds, first inverse flotation method, with the salt pan carnallite is raw material, the method of employing reverse flotation is removed sodium-chlor wherein, the defective of this method is a water insoluble matter content height in the low-sodium carnalite that obtains, contain flotation reagent in the product, granularity is inhomogeneous, will have a negative impact to the derived product quality.It two is to utilize to convert halogen and take off the method that Repone K is produced in the cold decomposition of sodium, this method provides a kind of utilization to convert the method that halogen takes off sodium device production low-sodium carnalite and then produces Repone K, but this method has the production process complexity, facility investment is big, requires to contain in the low-sodium carnalite of managerial personnel's state of the art height, production the defective of higher magnesium chloride.

Three, summary of the invention

The objective of the invention is deficiency at prior art, by development test a kind of utilization contain potassium bittern and be raw material, adopt and convert halogen and analyse the potassium screening and remove the sodium method and produce low-sodium carnalite, and then produce the Repone K product.

Technical process provided by the invention is analysed the potassium screening except that sodium, carnallitite washing, the cold decomposition of carnallitite, five operations of filtration drying for the potassium saturated solution prepares, converts halogen.

1, potassium saturated solution preparation:

Contain potassium bittern and comprise potassium chloride-type brine and sulfate type potassium-containing halogen water, potassium chloride-type brine or sulfate type potassium-containing halogen water are respectively with K ⁺, Na ⁺, Mg ²⁺, Cl ^--H ₂O quaternary system metastable phase diagram and K ⁺, Na ⁺, Mg ²⁺, Cl ^-, SO ₄ ^2--H ₂The O penton is the metastable phase diagram theoretical direction, and evaporation concentration is to the saturated potassium saturated solution that promptly obtains of potassium mineral under normal temperature condition, and potassium mineral refers to carnallitite and sylvite.

2, convert halogen and analyse the potassium screening except that sodium

Magnesium chloride saturated liquid also claims old halogen, magnesium chloride saturated liquid is mixed with the potassium saturated solution, utilize magnesium chloride the salting out of Repone K to be separated out the mixture of carnallitite and halite mineral, utilize in carnallitite and the halite mineral intermixture carnallitite granularity greater than the feature of halite granularity, the method screening of employing mechanical grading is converted halogen and is analysed the potassium ore pulp, obtaining screen overflow is that low-sodium carnalite enters the carnallitite washing procedure, sieve is squeezed into the salt pan evaporation for the ore pulp that contains halite and carnallitite down and is obtained two sections carnallitites and old halogen, old halogen is as converting the raw material that halogen is analysed potassium, two sections carnallitites can be used as the raw material that method for floating is produced Repone K, return after also can being dissolved in water and produce the potassium saturated solution, this method both can be removed particulate sodium-chlor with material sieving technology, also can reach the purpose of solid-liquid separation, and convert the halogen ore pulp and do not need the dense screening operation that directly enters.

Control condition: under the normal temperature condition, convert halogen and analyse potassium material ratio and be controlled at and convert after the halogen mother liquor and form point and be positioned at K ⁺, Na ⁺, Mg ²⁺, Cl ^--H ₂O quaternary system metastable phase diagram or K ⁺, Na ⁺, Mg ²⁺, Cl, SO ₄ ^2--H ₂The O penton is that the carnallitite phase region of metastable phase diagram is tried one's best near till the bischofite saturated line, and generally with the potassium saturated solution: old halogen is 1: 1～4 ratio; Convert the ore pulp that halogen analyses behind the potassium and sieve with standard sieve, the principle that the standard sieve sieve diameter is selected be most of bird's eye gravel salt mineral by screen cloth, generally adopt 120 orders～40 purpose screen clothes.

3, carnallitite washing

Because it is high mother liquid of magnesium that screening removes the mother liquor of carrying secretly in the carnallitite that obtains after the sodium solid-liquid separation, make in the carnallitite content of magnesium chloride higher, can be used as the high quality raw material of producing refined potassium chloride, but because magnesium/potassium ratio wherein surpasses low-sodium carnalite product volume standard, can not be as low-sodium carnalite direct distribution, adopt the washing of potassium saturated solution can reduce Mg content in the carnallitite, reach the quality standard of low-sodium carnalite.

Washing process and wash conditions: under the normal temperature condition, with carnallitite: the volume ratio of potassium saturated solution is 1: 0.3～3.5, and solid-liquid separation after 5～30 minutes agitator treating time obtains the solid low-sodium carnalite, washing lotion is returned system potassium saturated solution, and the low-sodium carnalite drying dewaters and obtains the low-sodium carnalite product.

Washing process can also be taked to finish with the mode of potassium saturated solution drip washing in screening plant.

If low-sodium carnalite when producing the raw material of Repone K, can not carry out the carnallitite washing, directly enter the cold decomposition process of carnallitite.

4, the cold decomposition of carnallitite

Under normal temperature condition, analyse the fresh water that the potassium screening removes adding calculated amount in the sodium operation gained low-sodium carnalite to converting halogen, under normal temperature, agitation condition, make magnesium chloride and small amount of sodium chloride in the carnallitite enter liquid phase, output contains the sylvite ore pulp.

Control condition: amount of water is that the dissolving of all magnesium chlorides enters liquid phase and is best amount of water in the low-sodium carnalite.

5, filtration drying

Ore pulp obtains solid sylvite filter cake through solid-liquid separation, and the filter cake drying dewaters and promptly obtains the refined potassium chloride product, and mother liquor returns system potassium saturated solution.

The present invention adopts method for sieving to remove and converts particulate sodium-chlor in the halogen ore pulp, equipment has been finished and has been converted halogen in the prior art and take off the task that sodium device, thickener and filter plant are finished, can save great deal of investment, reduce the device power load, reduce production costs significantly, available two kinds of products scheme all can gain high profits, and increase considerably added value of product, have improved the business economic benefit.

Four, embodiment:

Embodiment one: contain potassium bittern and select potassium chloride-type brine for use, use K ⁺, Na ⁺, Mg ²⁺, Cl ^--H ₂O quaternary system metastable phase diagram is made theoretical direction, evaporation concentration is saturated to the carnallitite mineral under normal temperature condition, its solution is the potassium saturated solution, converting halogen analyses potassium screening and remove sodium operation potassium saturated solution: old halogen volume ratio is 1: 1, converting the ore pulp that halogen analyses behind the potassium sieves with 120 purpose standard sieves, the carnallitite washing procedure at normal temperatures, carnallitite: potassium saturated solution volume ratio is 1: 0.3, washing time is that solid-liquid separation gets the low-sodium carnalite product after 5 minutes.

Embodiment two: contain potassium bittern and select sulfate type potassium-containing halogen water for use, use K ⁺, Na ⁺, Mg ²⁺, Cl ^-, SO ₄ ^2--H ₂The O penton is that metastable phase diagram is made theoretical direction, it is saturated that constant-temperature evaporation is concentrated to the sylvite mineral, solution is the potassium saturated solution, converting halogen analyses potassium screening and remove sodium operation potassium saturated solution: old halogen volume ratio is 1: 4, converting the ore pulp that halogen analyses behind the potassium sieves with 40 purpose standard sieves, the carnallitite washing procedure at normal temperatures, carnallitite: potassium saturated solution volume ratio is 1: 3.5, washing time is that solid-liquid separation gets the low-sodium carnalite product after 30 minutes.

Embodiment three: get embodiment two and convert halogen and analyse potassium screening to remove the carnallitite that the sodium operation produces be raw material, just can obtain the Repone K product with the cold decomposition of carnallitite, filtration drying again, the amount of water of the cold decomposition process of carnallitite is that all magnesium chloride dissolvings enter liquid phase in the low-sodium carnalite.

Claims

1. produce the method for low-sodium carnalite or Repone K with containing potassium bittern for one kind, the technical process that it is characterized in that it is that the full liquid that closes of potassium prepares, convert halogen and analyse the potassium screening except that sodium, the carnallitite washing, processing condition be potassium full close contain in the liquid preparation section potassium bittern under normal temperature condition evaporation concentration to potassium mineral full close the full liquid that closes of potassium, converting halogen analyses potassium screening and remove potassium saturated solution in the sodium operation: old halogen volume ratio is 1: 1～4, convert halogen and analyse ore pulp behind the potassium with 120 orders～40 purpose standard sieves screening, the carnallitite washing procedure at normal temperatures, carnallitite: potassium is full, and to close the liquid volume ratio be 1: 0.3～3.5, washing time is a solid-liquid separation after 5～30 minutes, solid is the low-sodium carnalite product, analyse and increase the cold decomposition of carnallitite again after potassium screening removes the sodium operation converting halogen, it is under normal temperature condition, analyse the fresh water that the potassium screening removes adding calculated amount in the sodium operation gained low-sodium carnalite to converting halogen, at normal temperature, make under the agitation condition that magnesium chloride and small amount of sodium chloride enter liquid phase in the carnallitite, output contains the sylvite ore pulp, more after filtration, dry two procedures promptly gets the Repone K product.