CN1887817A

CN1887817A - Process of preparing magnesium potassium fertilizer directly from bittern

Info

Publication number: CN1887817A
Application number: CN 200610041071
Authority: CN
Inventors: 张守祥; 郑宁; 朱晓东; 牛中英; 纪律; 李灿先; 张大义
Original assignee: Bluestar Lehigh Engineering Institute
Current assignee: Bluestar Lehigh Engineering Institute
Priority date: 2006-07-21
Filing date: 2006-07-21
Publication date: 2007-01-03
Anticipated expiration: 2026-07-21
Also published as: CN100384786C

Abstract

The process of preparing magnesium potassium fertilizer directly with bittern includes the following steps: mixing potassium saturated bittern, old bittern, mirabilite and mixed potassium salt while continuous stirring for full reaction in reactor, discharging slurry containing kainite crystal from the reactor and eliminating mother liquid to obtain solid kainite; adding solid kainite and fresh water as well as circulating mother liquid to the crystallizing area of crystallizing reactor through stirring for producing crystallizing reaction, discharging the slurry containing magnesium potassium fertilizer crystal and eliminating mother liquid to obtain crude solid magnesium potassium fertilizer; and laundering the crude solid magnesium potassium fertilizer to obtain magnesium potassium fertilizer product with picromeride content over 95 %.

Description

A kind of method that directly prepares potassic-magnesian fertilizer from bittern

Technical field

The present invention relates to a kind of method for preparing potassic-magnesian fertilizer, particularly directly produce the method for potassic-magnesian fertilizer from bittern.

Background technology

In the prior art, the method for preparing potassic-magnesian fertilizer mainly be by contain potassium, magniferous solid ore deposit processes, and is exactly that bittern teds into the ore deposit in the salt pan in addition, the mechanical harvesting post-treatment forms.Also not in the workshop directly by the method for bittern processing and preparing potassic-magnesian fertilizer.

Summary of the invention

Technical problem to be solved by this invention is at the prior art deficiency, propose a kind of new, can directly produce in the workshop directly prepare the method for potassic-magnesian fertilizer from bittern.

Technical problem to be solved by this invention is to realize by following technical scheme.The present invention a kind ofly directly prepares the method for potassic-magnesian fertilizer from bittern, is characterized in that its step is as follows,

(1) at the uniform velocity adds the potassium saturated bittern to reactor, at the uniform velocity add old halogen, saltcake and potassium mixed salt simultaneously, and carry out the complete mixing flow continuously stirring, fully react, the kainite crystalline slip that contains of reactor below is emitted from the lower part outlet of reactor, sloughs mother liquor, obtains the kainite solid;

(2) kainite solid and fresh water are at the uniform velocity added to the crystallization reactor crystallizing field, at the uniform velocity add circulating mother liquor more simultaneously to the crystallization reactor crystallizing field, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter and other impurity, upwards overflow crystallization reactor from the periphery of crystallizing field, the greater particle size potassic-magnesian fertilizer crystalline slip that contains of crystallization reactor crystallizing field below is emitted from the lower part outlet of reactor, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-describedly a kind ofly directly prepare the method for potassic-magnesian fertilizer, be characterized in that its step is as follows from bittern,

(1) presses the volumometer of reactor (1), with every cubic metre of volume per hour 0.05-2 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor (1), press 0.05-0.8 times (volume ratio) of potassium saturated bittern add-on simultaneously, at the uniform velocity add old halogen to reactor (1), press 0.01-0.5 times of (weightmeasurement ratio of potassium saturated bittern add-on, ton/cubic meter), at the uniform velocity add saltcake to reactor (1), press 0.05-0.6 times of (weightmeasurement ratio of potassium saturated bittern add-on, ton/cubic meter), at the uniform velocity add the potassium mixed salt to reactor (1), and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor (1) below is emitted from the lower part outlet of reactor (1), slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water by weight 1: ratio (0.1-0.8), at the uniform velocity add to crystallization reactor (4) crystallizing field (5), the 1-10 that presses simultaneously kainite weight more doubly at the uniform velocity adds circulating mother liquor to crystallization reactor (4) crystallizing field (5), carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter (2) and other impurity, upwards overflow crystallization reactor (4) from the periphery (3) of crystallizing field (5), the slip that contains greater particle size potassic-magnesian fertilizer crystal (6) of crystallization reactor (4) crystallizing field (5) below is emitted from the lower part outlet (7) of crystallization reactor (4), slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

(1) presses the volumometer of reactor, with every cubic metre of volume per hour 0.1-1 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor, press 0.1-0.4 times (volume ratio) of potassium saturated bittern add-on simultaneously, at the uniform velocity add old halogen to reactor, press 0.06-0.1 times of (weightmeasurement ratio of potassium saturated bittern add-on, ton/cubic meter), at the uniform velocity add saltcake to reactor, press 0.2-0.3 times of (weightmeasurement ratio of potassium saturated bittern add-on, ton/cubic meter), at the uniform velocity add the potassium mixed salt to reactor, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor below is emitted from the lower part outlet of reactor, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water by weight 1: ratio (0.3-0.4), at the uniform velocity add to the crystallization reactor crystallizing field, the 3-6 that presses simultaneously kainite weight more doubly at the uniform velocity adds circulating mother liquor to the crystallization reactor crystallizing field, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter and other impurity, upwards overflow crystallization reactor from the periphery of crystallizing field, the greater particle size potassic-magnesian fertilizer crystalline slip that contains of crystallization reactor crystallizing field below is emitted from the lower part outlet of crystallization reactor, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The present invention utilizes potassium saturated bittern, old halogen and saltcake and potassium mixed salt to carry out hybrid reaction, generate kainite, kainite and water carry out crystallization reaction and generate potassic-magnesian fertilizer in reactor, in reactor, add simultaneously circulating mother liquor, the degree of supersaturation of controlling reactor crystallizing field, reach the granularity purpose of control potassic-magnesian fertilizer, moreover regulate the lift velocity of overflow mother liquor, take away impurity such as less crystallization sodium-chlor with assurance.Guarantee the potassic-magnesian fertilizer quality.Potassium mixed salt of the present invention is the sylvite mixture that contains carnallitite, halite and a small amount of epsom salt, its composition is based on carnallitite, the present invention can utilize the discharge mother liquor to convert halogen and generate the potassium mixed salt as raw material, in the initial production process, can replace the potassium mixed salt with carnallitite, behind the continuous production, then use the discharge mother liquor to convert halogen and generate the potassium mixed salt, its cost is low, and is easy to use, also can use the potassium mixed salt that obtains in other technology to make raw material certainly.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-describedly a kind ofly directly prepare the method for potassic-magnesian fertilizer, be characterized in from bittern, with the sulfate type potassium-containing halogen water gathered by the beach, salt pan shine, spontaneous evaporation dewater saturated to potassium mineral, the potassium saturated bittern.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described a kind of method that directly prepares potassic-magnesian fertilizer from bittern, be characterized in, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with old halogen by weight 1: ratio (1-3), at the uniform velocity add to the crystallization reactor crystallizing field, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter and other impurity, upwards overflow crystallization reactor from the periphery of crystallizing field, the greater particle size potassium mixed salt crystalline slip that contains of crystallization reactor crystallizing field below is emitted from the lower part outlet of crystallization reactor, slough mother liquor, obtain potassium mixed salt solid.Like this, can utilize the discharge mother liquor to convert halogen and generate the potassium mixed salt, both can reduce the wasting of resources, also can reduce production costs, realize benign cycle.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-describedly a kind ofly directly prepare the method for potassic-magnesian fertilizer, be characterized in, separate mother liquor behind the potassium mixed salt and return the beach, salt pan and shine from bittern, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is not less than 8.0% old halogen, it is returned in the step (1) or in the potassium mixed salt production system use.Like this, both can reduce the wasting of resources, also can reduce production costs, realize benign cycle.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described a kind of method that directly prepares potassic-magnesian fertilizer from bittern, be characterized in, when the solid-liquid weight ratio that contains greater particle size potassium mixed salt crystalline slip of crystallization reactor crystallizing field below reaches 12%-35%, again its lower part outlet from crystallization reactor is emitted.Like this, can make reaction mass in the crystallization reactor crystallizing field, have the more rational residence time and reaction density.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-described a kind of method that directly prepares potassic-magnesian fertilizer from bittern, be characterized in, in step (2), when the solid-liquid weight ratio that contains greater particle size potassic-magnesian fertilizer crystalline slip of crystallization reactor crystallizing field below reaches 15%-30%, again its lower part outlet from crystallization reactor is emitted.Like this, can make reaction mass in the crystallization reactor crystallizing field, have the more rational residence time and reaction density.

Technical problem to be solved by this invention can also further realize by following technical scheme.Above-describedly a kind ofly directly prepare the method for potassic-magnesian fertilizer, be characterized in described potassium saturated bittern potassium ion K from bittern ⁺Percentage composition be not less than 1.2%, magnesium ion Mg ²⁺Percentage composition be 5.0-7.0%, sulfate ion SO ₄ ^2-Percentage composition be 4.5-7.0%.Like this, can make to guarantee that further sufficient reacting carries out, improve the quality of product potassic-magnesian fertilizer.

Compared with prior art, advantage of the present invention is as follows:

1, the present invention can be implemented in the workshop directly by bittern processing and preparing potassium magnesium;

2, can produce the potassic-magnesian fertilizer product of schoenite content more than 95% with technology of the present invention;

3, used old halogen of raw material and the potassium mixed salt of the present invention can make from reaction mother liquor, both saved resource, also reduces cost simultaneously, realizes benign cycle.

Description of drawings

Fig. 1 is a process flow sheet of the present invention.

Fig. 2 is the structural representation of reactor of the present invention.

Fig. 3 is the structural representation of crystallization reactor of the present invention.

Embodiment

With reference to the accompanying drawings, further describe concrete technology of the present invention

Embodiment 1.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) at the uniform velocity adds the potassium saturated bittern to reactor 1, at the uniform velocity add simultaneously old halogen, saltcake and potassium mixed salt, and carry out the complete mixing flow continuously stirring, fully react, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) kainite solid and fresh water are at the uniform velocity added to crystallization reactor 4 crystallizing fields 5, at the uniform velocity add circulating mother liquor more simultaneously to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 2.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.05 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.05 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.01 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.05 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.1, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,1 times that presses simultaneously kainite weight more at the uniform velocity adds circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 2 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.8 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.5 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.6 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.8, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,10 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 4.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 1.5 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.6 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.05 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.1 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.2, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,2 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 5.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 1.2 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.5 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.3 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.4 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.6, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,8 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 6.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.03 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.03 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.005 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.02 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.05, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,0.5 times that presses simultaneously kainite weight more at the uniform velocity adds circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 7.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 2.2 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 1.0 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.8 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.8 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 1, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,12 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 8.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.1 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.1 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.06 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.2 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.3, at the uniform velocity add to crystallization reactor 4 crystallizing

fields

5,3 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 9.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 1 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.4 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.1 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.3 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.4, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,6 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 10.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.5 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.25 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.08 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.25 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.35, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,4.5 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Embodiment 11.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.3 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.3 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.07 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.22 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.32, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,4 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 15%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The potassium saturated bittern of present embodiment makes by the following method: it is saturated to potassium mineral that the sulfate type potassium-containing halogen water of gathering is dewatered by the solarization of beach, salt pan, spontaneous evaporation, gets the potassium saturated bittern; Described potassium saturated bittern potassium ion K ⁺Percentage composition be 1.2%, magnesium ion Mg ²⁺Percentage composition be 5.0%, sulfate ion SO ₄ ^2-Percentage composition be 4.5%;

Embodiment 12.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.8 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.35 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.09 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.28 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.38, at the uniform velocity add to crystallization reactor 4

crystallizing fields

5,5 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 22%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The potassium saturated bittern of present embodiment makes by the following method: it is saturated to potassium mineral that the sulfate type potassium-containing halogen water of gathering is dewatered by the solarization of beach, salt pan, spontaneous evaporation, gets the potassium saturated bittern; Described potassium saturated bittern potassium ion K ⁺Percentage composition be 1.4%, magnesium ion Mg ²⁺Percentage composition be 7.0%, sulfate ion SO ₄ ^2-Percentage composition be 7.0%;

Embodiment 13.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.7 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.15 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.07 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.26 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.36, at the uniform velocity add to crystallization reactor 4

crystallizing fields

5,5 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 28%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The potassium saturated bittern of present embodiment makes by the following method: it is saturated to potassium mineral that the sulfate type potassium-containing halogen water of gathering is dewatered by the solarization of beach, salt pan, spontaneous evaporation, gets the potassium saturated bittern; Described potassium saturated bittern potassium ion K ⁺Percentage composition be 1.6%, magnesium ion Mg ₂₊Percentage composition be 6.0%, sulfate ion SO ₄ ^2-Percentage composition be 6.0%;

Embodiment 14.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.05 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.05 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.05 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.15 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.2, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,2 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 18%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The potassium saturated bittern of present embodiment makes by the following method: it is saturated to potassium mineral that the sulfate type potassium-containing halogen water of gathering is dewatered by the solarization of beach, salt pan, spontaneous evaporation, gets the potassium saturated bittern; Described potassium saturated bittern potassium ion K ⁺Percentage composition be 1.0%, magnesium ion Mg ²⁺Percentage composition be 4.5%, sulfate ion SO ₄ ^2-Percentage composition be 4.0%;

Embodiment 15.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 1.2 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.50 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.15 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.35 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.45, at the uniform velocity add to crystallization reactor 4

crystallizing fields

5,7 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 25%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The potassium saturated bittern of present embodiment makes by dissolving, wherein, and potassium ion K ⁺Percentage composition be 0.8%, magnesium ion Mg ²⁺Percentage composition be 8.0%, sulfate ion SO ₄ ^2-Percentage composition be 8.0%;

Embodiment 16.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 1.8 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.70 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.2 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.5 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.7, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,2 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 20%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

The potassium saturated bittern of present embodiment makes by dissolving, wherein, and potassium ion K ⁺Percentage composition be 0.8%, magnesium ion Mg ²⁺Percentage composition be 3.0%, sulfate ion SO ₄ ^2-Percentage composition be 2.0%;

Embodiment 17.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 1.6 cubical feed rates at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.7 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.3 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.4 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.5, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,8 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 30%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Potassium ion K in the potassium saturated bittern of present embodiment ⁺Percentage composition be 0.1%, magnesium ion Mg ²⁺Percentage composition be 9.0%, sulfate ion SO ₄ ^2-Percentage composition be 8.5%;

Embodiment 18.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.6 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.2 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.08 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.1 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.7, at the uniform velocity add to crystallization reactor 4

crystallizing fields

5,5 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 40%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Potassium ion K in the potassium saturated bittern of present embodiment ⁺Percentage composition be 0.2%, magnesium ion Mg ²⁺Percentage composition be 2.5%, sulfate ion SO ₄ ^2-Percentage composition be 1.5%;

Embodiment 19.With reference to Fig. 1, Fig. 2, Fig. 3.A kind ofly directly prepare the method for potassic-magnesian fertilizer from bittern, its step is as follows,

(1) presses the volumometer of reactor 1, with every cubic metre of volume per hour 0.8 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor 1, press potassium saturated bittern add-on simultaneously 0.3 times, at the uniform velocity add old halogen to reactor 1, press potassium saturated bittern add-on 0.2 times, at the uniform velocity add saltcake to reactor 1, press potassium saturated bittern add-on 0.25 times, at the uniform velocity add the potassium mixed salt to reactor 1, and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water ratio by weight 1: 0.25, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5,9 times that press simultaneously kainite weight more at the uniform velocity add circulating mother liquor to crystallization reactor 4 crystallizing fields 5, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 10%, again the slip that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

Potassium ion K in the potassium saturated bittern of present embodiment ⁺Percentage composition be 0.4%, magnesium ion Mg ²⁺Percentage composition be 5.8%, sulfate ion SO ₄ ^2-Percentage composition be 6.8%;

Embodiment 20.See Fig. 1, Fig. 2, Fig. 3 in embodiment 1, converts the mother liquor that contains the less crystal 2 of part particle diameter and other impurity that overflows crystallization reactor 4 that stew in soy sauce potassium mixed salt produced, and shines through the beach, salt pan, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 8.6% old halogen, returns in the step (1) and uses.

Embodiment 21.See Fig. 1, Fig. 2, Fig. 3 in embodiment 2, converts the mother liquor that contains the less crystal 2 of part particle diameter and other impurity that overflows crystallization reactor 4 that stew in soy sauce potassium mixed salt produced, and shines through the beach, salt pan, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 9.0% old halogen, returns in the step (1) and uses.

Embodiment 22.In embodiment 1, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 1, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid.

Embodiment 23.In embodiment 2, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 3, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid.

Embodiment 24.In embodiment 3, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 2, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid.

Embodiment 25.In embodiment 4, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 2, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 12%, again the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid; Return the beach, salt pan and shine separating mother liquor behind the potassium mixed salt, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 8.0% old halogen, it is returned in the step (1) use in the production system;

Embodiment 26.In embodiment 4, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 1, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 35%, again the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid; Return the beach, salt pan and shine separating mother liquor behind the potassium mixed salt, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 8.2% old halogen, it is returned in the potassium mixed salt production system use.

Embodiment 27.In embodiment 5, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 2, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 25%, again the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid; Return the beach, salt pan and shine separating mother liquor behind the potassium mixed salt, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 8.4% old halogen, it is returned in the step (1) He in the potassium mixed salt production system use.

Embodiment 28.In embodiment 6, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 1.5, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 20%, again the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid; Return the beach, salt pan and shine separating mother liquor behind the potassium mixed salt, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 7.8% old halogen, it is returned in the step (1) He in the potassium mixed salt production system use.

Embodiment 29.In embodiment 7, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 2.5, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 15%, again the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid; Return the beach, salt pan and shine separating mother liquor behind the potassium mixed salt, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 7.5% old halogen, it is returned in the step (1) He in the potassium mixed salt production system use.

Embodiment 30.In embodiment 8, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with the ratio of old halogen by weight 1: 2.8, at the uniform velocity add to crystallization reactor 4 crystallizing fields 5, and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches 18%, again the slip that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows is emitted from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid; Return the beach, salt pan and shine separating mother liquor behind the potassium mixed salt, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is 9.0% old halogen, it is returned in the step (1) He in the potassium mixed salt production system use.

Embodiment 31.See Fig. 1, Fig. 2, Fig. 3, present embodiment utilizes bittern directly to produce in the method for potassic-magnesian fertilizer, the volume of reactor 1 is 1 cubic metre, at the uniform velocity add the potassium saturated bittern with 1 cubical feed rate per hour to reactor 1, per hour press 0.4 cubical feed rate simultaneously and at the uniform velocity add old halogen to reactor 1, simultaneously at the uniform velocity add saltcake with the feed rate of 60KG per hour again to reactor 1, simultaneously at the uniform velocity add the potassium mixed salt with the feed rate of 200KG per hour again, carry out the complete mixing flow continuously stirring, react to reactor 1, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid

It is in the 1 cubical crystallization reactor 4 that the kainite solid at the uniform velocity joins crystallization reactor 4 crystallizing fields 5 volumes with the feed rate of 350KG per hour, simultaneously again with the feed rate of 105KG per hour, at the uniform velocity add fresh water to crystallization reactor 4 crystallizing fields 5, the amount of circulating mother liquor is 2100KG per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 30% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain the potassic-magnesian fertilizer solid, the potassic-magnesian fertilizer solid is through washing and starching, and obtains schoenite content and be 95.0% potassic-magnesian fertilizer product.

Obtain the mother liquor that kainite produces and obtain mother liquor that potassic-magnesian fertilizer produces after clarification, the volume that at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 2 cubical feed rates per hour is in the 3 cubical crystallization reactors 4, old halogen at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 4 cubical feed rates per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 35% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid, this potassium mixed salt is as the raw material of kainite preparation section.

The described potassium saturated bittern of present embodiment potassium ion K ⁺Percentage composition be 2.4%, magnesium ion Mg ²⁺Percentage composition be 5.0%, sulfate ion SO ₄ ^2-Percentage composition be 7.0%.

Embodiment 32.See Fig. 1, Fig. 2, Fig. 3, present embodiment utilizes bittern directly to produce in the method for potassic-magnesian fertilizer, the volume of reactor 1 is 1 cubic metre, at the uniform velocity add the potassium saturated bittern with 0.5 cubical feed rate per hour to reactor 1, per hour press 0.05 cubical feed rate simultaneously and at the uniform velocity add old halogen to reactor 1, simultaneously at the uniform velocity add saltcake with the feed rate of 50KG per hour again to reactor 1, simultaneously at the uniform velocity add the potassium mixed salt that back segment was produced with the feed rate of 150KG per hour again to reactor 1, carry out the complete mixing flow continuously stirring, react, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid

It is in the 1 cubical crystallization reactor 4 that the kainite solid at the uniform velocity joins crystallization reactor 4 crystallizing fields 5 volumes with the feed rate of 200KG per hour, simultaneously again with the feed rate of 80KG per hour, at the uniform velocity add fresh water to crystallization reactor 4 crystallizing fields 5, the amount of circulating mother liquor is 800KG per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 15% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain the potassic-magnesian fertilizer solid, the potassic-magnesian fertilizer solid is through washing and starching, and obtains schoenite content and be 98.0% potassic-magnesian fertilizer product.

Obtain the mother liquor that kainite produces and obtain mother liquor that potassic-magnesian fertilizer produces after clarification, the volume that at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 1 cubical feed rate per hour is in the 2 cubical crystallization reactors 4, old halogen at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 3 cubical feed rates per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 20% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid, this potassium mixed salt is as the raw material of kainite preparation section.

The described potassium saturated bittern of present embodiment potassium ion K ⁺Percentage composition be 1.2%, magnesium ion Mg ²⁺Percentage composition be 7.0%, sulfate ion SO ₄ ^2-Percentage composition be 4.5%.

Embodiment 33.See Fig. 1, Fig. 2, Fig. 3, present embodiment utilizes bittern directly to produce in the method for potassic-magnesian fertilizer, the volume of reactor 1 is 0.2 cubic metre, at the uniform velocity add the potassium saturated bittern with 0.02 cubical feed rate per hour to reactor 1, per hour press 0.008 cubical feed rate simultaneously and at the uniform velocity add old halogen to reactor 1, simultaneously at the uniform velocity add saltcake with the feed rate of 2.0KG per hour again to reactor 1, simultaneously at the uniform velocity add the potassium mixed salt that back segment was produced with the feed rate of 6KG per hour again to reactor 1, carry out the complete mixing flow continuously stirring, react, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet of reactor 1, slough mother liquor, obtain the kainite solid

It is in the 0.2 cubical crystallization reactor 4 that the kainite solid at the uniform velocity joins crystallization reactor 4 crystallizing fields 5 volumes with the feed rate of 8KG per hour, simultaneously again with the feed rate of 2.8KG per hour, at the uniform velocity add fresh water to crystallization reactor 4 crystallizing fields 5, the amount of circulating mother liquor is 28KG per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 20% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain the potassic-magnesian fertilizer solid, the potassic-magnesian fertilizer solid is through washing and starching, and obtains schoenite content and be 96.0% potassic-magnesian fertilizer product.

Obtain the mother liquor that kainite produces and obtain mother liquor that potassic-magnesian fertilizer produces after clarification, the volume that at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 0.06 cubical feed rate per hour is in the 0.6 cubical crystallization reactor 4, old halogen at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 0.06 cubical feed rate per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 12% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid, this potassium mixed salt is as the raw material of kainite preparation section.

The described potassium saturated bittern of present embodiment potassium ion K ⁺Percentage composition be 2.0%, magnesium ion Mg ²⁺Percentage composition be 5.0%, sulfate ion SO ₄ ^2-Percentage composition be 5.5%.

Embodiment 34.See Fig. 1, Fig. 2, Fig. 3, present embodiment utilizes bittern directly to produce in the method for potassic-magnesian fertilizer, the volume of reactor 1 is 1 cubic metre, at the uniform velocity add the potassium saturated bittern with 1 cubical feed rate per hour to reactor 1, simultaneously at the uniform velocity add old halogen to reactor 1 with 0.2 cubical feed rate per hour, simultaneously at the uniform velocity add saltcake with the feed rate of 100KG per hour again to reactor 1, simultaneously at the uniform velocity add the potassium mixed salt that back segment was produced with the feed rate of 300KG per hour again to reactor 1, carry out the complete mixing flow continuously stirring, react, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet 7 of reactor 1, slough mother liquor, obtain the kainite solid

It is in the 1 cubical crystallization reactor 4 that the kainite solid at the uniform velocity joins crystallization reactor 4 crystallizing fields 5 volumes with the feed rate of 400KG per hour, simultaneously again with the feed rate of 120KG per hour, at the uniform velocity add fresh water to crystallization reactor 4 crystallizing fields 5, the amount of circulating mother liquor is 1200KG per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 20% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain the potassic-magnesian fertilizer solid, the potassic-magnesian fertilizer solid is through washing and starching, and obtains schoenite content and be 95.5% potassic-magnesian fertilizer product.

Obtain the mother liquor that kainite produces and obtain mother liquor that potassic-magnesian fertilizer produces after clarification, the volume that at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 2 cubical feed rates per hour is in the 3 cubical crystallization reactors, old halogen at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 4 cubical feed rates per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 25% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid, this potassium mixed salt is as the raw material of kainite preparation section.

The described potassium saturated bittern of present embodiment potassium ion K ⁺Percentage composition be 2.0%, magnesium ion Mg ²⁺Percentage composition be 6.1%, sulfate ion SO ₄ ^2-Percentage composition be 6.0%.

Embodiment 35.See Fig. 1, Fig. 2, Fig. 3, present embodiment utilizes bittern directly to produce in the method for potassic-magnesian fertilizer, the volume of reactor 1 is 1 cubic metre, at the uniform velocity add the potassium saturated bittern with 1 cubical feed rate per hour to reactor 1, per hour press 0.4 cubical feed rate simultaneously and at the uniform velocity add old halogen to reactor 1, simultaneously at the uniform velocity add saltcake with the feed rate of 100KG per hour again to reactor 1, simultaneously at the uniform velocity add the potassium mixed salt that back segment was produced with the feed rate of 200KG per hour again to reactor 1, carry out the complete mixing flow continuously stirring, react, the kainite crystalline slip that contains of reactor 1 below is emitted from the lower part outlet 7 of reactor 1, slough mother liquor, obtain the kainite solid

It is in the 1 cubical crystallization reactor 4 that the kainite solid at the uniform velocity joins crystallization reactor 4 crystallizing fields 5 volumes with the feed rate of 380KG per hour, simultaneously again with the feed rate of 152KG per hour, at the uniform velocity add fresh water to crystallization reactor 4 crystallizing fields 5, the amount of circulating mother liquor is 2280KG per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassic-magnesian fertilizer crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 30% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain the potassic-magnesian fertilizer solid, the potassic-magnesian fertilizer solid is through washing and starching, and obtains schoenite content and be 96.5% potassic-magnesian fertilizer product.

Obtain the mother liquor that kainite produces and obtain mother liquor that potassic-magnesian fertilizer produces after clarification, the volume that at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 2 cubical feed rates per hour is in the 3 cubical crystallization reactors 4, old halogen at the uniform velocity adds crystallization reactor 4 crystallizing fields 5 with 3 cubical feed rates per hour, carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal 2 of part particle diameter and other impurity, upwards overflow crystallization reactor 4 from the periphery 3 of crystallizing field 5, the pulp density weight ratio that contains greater particle size potassium mixed salt crystal 6 of crystallization reactor 4 crystallizing fields 5 belows reaches at 25% o'clock, emit from the lower part outlet 7 of crystallization reactor 4, slough mother liquor, obtain potassium mixed salt solid, this potassium mixed salt is as the raw material of kainite preparation section.

Claims

1, a kind ofly directly prepare the method for potassic-magnesian fertilizer, it is characterized in that its step is as follows from bittern,

(1) at the uniform velocity adds the potassium saturated bittern to reactor (1), at the uniform velocity add simultaneously old halogen, saltcake and potassium mixed salt, and carry out the complete mixing flow continuously stirring, fully react, the kainite crystalline slip that contains of reactor (1) below is emitted from the lower part outlet of reactor (1), slough mother liquor, obtain the kainite solid;

(2) kainite solid and fresh water are at the uniform velocity added to crystallization reactor (4) crystallizing field (5), at the uniform velocity add circulating mother liquor more simultaneously to crystallization reactor (4) crystallizing field (5), carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter (2) and other impurity, upwards overflow crystallization reactor (4) from the periphery (3) of crystallizing field (5), the slip that contains greater particle size potassic-magnesian fertilizer crystal (6) of crystallization reactor (4) crystallizing field (5) below is emitted from the lower part outlet (7) of crystallization reactor (4), slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

2, according to claim 1ly a kind ofly directly prepare the method for potassic-magnesian fertilizer, it is characterized in that its step is as follows from bittern,

(1) presses the volumometer of reactor (1), with every cubic metre of volume per hour 0.05-2 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor (1), the 0.05-0.8 that presses potassium saturated bittern add-on simultaneously doubly, at the uniform velocity add old halogen to reactor (1), the 0.01-0.5 that presses potassium saturated bittern add-on doubly, at the uniform velocity add saltcake to reactor (1), the 0.05-0.6 that presses potassium saturated bittern add-on doubly, at the uniform velocity add the potassium mixed salt to reactor (1), and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor (1) below is emitted from the lower part outlet of reactor (1), slough mother liquor, obtain the kainite solid;

3, according to claim 1ly a kind ofly directly prepare the method for potassic-magnesian fertilizer, it is characterized in that its step is as follows from bittern,

(1) presses the volumometer of reactor (1), with every cubic metre of volume per hour 0.1-1 cubical feed rate at the uniform velocity add the potassium saturated bittern to reactor (1), the 0.1-0.4 that presses potassium saturated bittern add-on simultaneously doubly, at the uniform velocity add old halogen to reactor (1), the 0.06-0.1 that presses potassium saturated bittern add-on doubly, at the uniform velocity add saltcake to reactor (1), the 0.2-0.3 that presses potassium saturated bittern add-on doubly, at the uniform velocity add the potassium mixed salt to reactor (1), and carry out the complete mixing flow continuously stirring, and fully reacting, the kainite crystalline slip that contains of reactor (1) below is emitted from the lower part outlet of reactor (1), slough mother liquor, obtain the kainite solid;

(2) with kainite solid and fresh water by weight 1: ratio (0.3-0.4), at the uniform velocity add to crystallization reactor (4) crystallizing field (5), the 3-6 that presses simultaneously kainite weight more doubly at the uniform velocity adds circulating mother liquor to crystallization reactor (4) crystallizing field (5), carry out the complete mixing flow continuously stirring, carry out crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter (2) and other impurity, upwards overflow crystallization reactor (4) from the periphery (3) of crystallizing field (5), the slip that contains greater particle size potassic-magnesian fertilizer crystal (6) of crystallization reactor (4) crystallizing field (5) below is emitted from the lower part outlet (7) of crystallization reactor (4), slough mother liquor, obtain thick potassic-magnesian fertilizer solid, thick potassic-magnesian fertilizer solid obtains the potassic-magnesian fertilizer product through washing and starching.

4, describedly a kind ofly directly prepare the method for potassic-magnesian fertilizer according to claim 1 or 2 or 3, it is characterized in that from bittern, with the sulfate type potassium-containing halogen water gathered by the beach, salt pan shine, spontaneous evaporation dewater saturated to potassium mineral, the potassium saturated bittern.

5, according to claim 1 or 2 or 3 described a kind of methods that directly prepare potassic-magnesian fertilizer from bittern, it is characterized in that, the potassium mixed salt that is added in the step (1) makes by the following method: will obtain the mother liquor that kainite produces and obtain mother liquor that thick potassic-magnesian fertilizer produces after clarification, with old halogen by weight 1: ratio (1-3), at the uniform velocity add to crystallization reactor (4) crystallizing field (5), and carry out the complete mixing flow continuously stirring, convert the halogen crystallization reaction, allow the mother liquor that contains the less crystal of part particle diameter (2) and other impurity, upwards overflow crystallization reactor (4) from the periphery (3) of crystallizing field (5), the slip that contains greater particle size potassium mixed salt crystal (6) of crystallization reactor (4) crystallizing field (5) below is emitted from the lower part outlet (7) of crystallization reactor (4), slough mother liquor, obtain potassium mixed salt solid.

6, according to claim 5ly a kind ofly directly prepare the method for potassic-magnesian fertilizer, it is characterized in that, separate mother liquor behind the potassium mixed salt and return the beach, salt pan and shine from bittern, separate out the solid ore deposit after, obtain magnesium ion Mg ²⁺Percentage composition is not less than 8.0% old halogen, it is returned in the step (1) or in the potassium mixed salt production system use.

7, a kind of method that directly prepares potassic-magnesian fertilizer from bittern according to claim 5, it is characterized in that, when the solid-liquid weight ratio of the slip that contains greater particle size potassium mixed salt crystal (6) below crystallization reactor (4) crystallizing field (5) reaches 12%-35%, again its lower part outlet from crystallization reactor (4) (7) is emitted.

8, according to claim 1 or the 2 or 3 described methods that prepare potassic-magnesian fertilizer, it is characterized in that, in step (2), when the solid-liquid weight ratio of the slip that contains greater particle size potassic-magnesian fertilizer crystal (6) below crystallization reactor (4) crystallizing field (5) reaches 15%-30%, again its lower part outlet from crystallization reactor (4) (7) is emitted.

9, describedly a kind ofly directly prepare the method for potassic-magnesian fertilizer according to claim 1 or 2 or 3, it is characterized in that described potassium saturated bittern potassium ion K from bittern ⁺Percentage composition be not less than 1.2%, magnesium ion Mg ²⁺Percentage composition be 5.0-7.0%, sulfate ion SO ₄ ^2-Percentage composition be 4.5-7.0%.