CN1275857C

CN1275857C - Process for producing potassium sulfate by salt field method

Info

Publication number: CN1275857C
Application number: CN 200410069545
Authority: CN
Inventors: 魏新俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-03
Filing date: 2004-07-03
Publication date: 2006-09-20
Anticipated expiration: 2024-07-03
Also published as: CN1587049A

Abstract

The present invention relates to a method for producing potassium sulfate in a salt field, which belongs to the technical field of the chemical engineering in salt industry. The method is characterized in that the technological flow comprises the working procedures of producing potassium mixed salt solution by the evaporation of a salt field, producing low-sodium carnallite solution by brine mixing, producing soft potassium mixed salt solution by recrystallization, and obtaining potassium sulfate products by the evaporation of the salt field. The present invention has the technological conditions that brine is mixed in potassium saturated solution, aged bittern and soft potassium mother solution in the working procedure of producing low-sodium carnallite solution; the component point of the mother solution is adjusted to the common saturation point of carnallite, epsomite and sylvinite; water is removed by evaporation to enable the carnallite to be saturated; 0.3 to 3 times of aged bittern is added separate out low-sodium carnallite; in the working procedure of producing soft potassium mixed salt solution by recrystallization, potassium mixed salt solution, low-sodium carnallite solution and potassium sulfate mother solution are mixed to enable brine after mixing to reach the common saturation point line of schoenite and sylvinite. The method has the advantages of little equipment investment, easy operation, low energy consumption, low production cost, no flotation agent in products, etc.

Description

Saltpan method is produced the method for vitriolate of tartar

One, technical field: the invention belongs to the salt industry chemical technology field, relate in particular to the method that a kind of saltpan method is produced vitriolate of tartar.

Two, background technology: produce vitriolate of tartar with vitriolate type bittern, the external general salt pan Exposure to Sunlight partition method that adopts, elder generation's output potassium mixed salt, the potassium mixed salt is the mixture of vitriol or chloride type potassium-bearing mineral and epsom salt, halite, the back all abbreviates the potassium mixed salt as, again the potassium mixed salt is delivered to the workshop and make schoenite with flotation or the method that adds water decomposition, schoenite adds Repone K and water again and transforms and produce vitriolate of tartar.The deficiency of this method is that plant investment is big, and energy consumption is big in the production, and Repone K cost height has flotation reagent in the product.Also have the technology of finishing in the salt pan with aforesaid method, it is exactly the potassium mixed salt.Be dissolved in water, the evaporative crystallization soft potassium mixed salt, soft potassium mixed salt adds the technology of the complete molten production vitriolate of tartar of Repone K again, its deficiency need add Repone K, the production cost height.

Three, summary of the invention:

The objective of the invention is to study a kind of new method at existing method above shortcomings, this method can effectively overcome the deficiencies in the prior art, and it is little that it has facility investment, and production cost is low, advantage such as no flotation reagent in the product.

Technical scheme is: the feature that this saltpan method is produced the method for vitriolate of tartar is: (one), technical process be the salt pan evaporation produce the potassium mixed salt solution, convert halogen produce low-sodium carnalite solution, recrystallization produce soft potassium mixed salt solution, salt pan evaporate potassium product; (2), processing condition are that salt pan evaporation production potassium mixed salt solution operation is to dewater in salt Tanaka evaporation with vitriolate type bittern to separate out sodium salt or epsom salt, when treating that the potassium mixed salt is saturated, solid-liquid separation gets sodium salt or epsom salt solid and potassium saturated solution, the potassium saturated solution dewaters in the salt pan evaporation and separates out the potassium mixed salt, when treating that bischofite is saturated, solid-liquid separation gets the potassium mixed salt, the potassium mixed salt be dissolved in water the potassium mixed salt solution; Converting halogen production low-sodium carnalite solution operation is to convert halogen with potassium saturated solution, old halogen and soft potassium mother liquor, adjusting the mother liquor component selects to the full altogether point of carnallitite, epsom salt and sylvite place, evaporation dewaters and makes carnallitite saturated, the old halogen that is blended into 0.3～3 times is separated out low-sodium carnalite, discharge mother liquor and get the low-sodium carnalite solid, its mother liquor returns salt pan evaporation and produces in the potassium mixed salt operation and produce the potassium mixed salt, low-sodium carnalite be dissolved in water low-sodium carnalite solution; Recrystallization is produced soft potassium mixed salt solution operation potassium mixed salt solution, low-sodium carnalite solution and potassium sulfate mother liquid is mixed, make mixing back bittern component reach schoenite and sylvite saturated line place, evaporation removes the water crystallization soft potassium mixed salt, solid-liquid separation when treating that sodium-chlor is saturated, its mother liquor is soft potassium mother liquor, it returns and converts halogen and produce low-sodium carnalite solution, the solid soft potassium mixed salt be dissolved in water soft potassium mixed salt solution; The salt pan evaporate the potassium product operation with soft potassium mixed salt solution at salt Tanaka evaporative crystallization vitriolate of tartar, solid-liquid separation gets potassium product when treating that other salt is saturated, its mother liquor is a potassium sulfate mother liquid, it returns recrystallization and produces in the soft potassium mixed salt operation.Soft potassium mixed salt is the mixture of schoenite and sylvite.The potassium saturated solution is the saturated solution of various sylvite mineral, as saturated potassium chloride solution, and vitriolate of tartar saturated solution, carnallitite saturated solution ...Old halogen is being commonly called as of bischofite saturated solution.Converting halogen production low-sodium carnalite solution operation adjustment mother liquor component and select to the method for calculation at the full altogether point of carnallitite, epsom salt and sylvite place, is according to chemical ingredients in potassium saturated solution, old halogen, the soft potassium mother liquor, uses Na ⁺, K ⁺, Mg ²⁺/ Cl ^-, SO ₄ ^2--H ₂The O penton is a phasor, analytical calculation under the normal temperature.

The method of calculation that recrystallization production soft potassium mixed salt solution operation makes mixing back bittern component reach schoenite and sylvite saturated line place still adopt Na ⁺, K ⁺, Mg ²⁺/ Cl ^-, SO ₄ ^2--H ₂The O penton is a phasor, and the chemical composition analytical calculation according to potassium mixed salt solution, low-sodium carnalite solution, potassium sulfate mother liquid under the normal temperature comes.

The present invention adopts four sections methods to produce vitriolate of tartar, and four sections established technologies are four parts, and it has easy to control, and is easy to operate, and facility investment is few, and energy consumption is low, and production cost is low, series of advantages such as no flotation reagent in the product.

Four, embodiment:

Embodiment: the vitriolate type bittern that adopts Qinghai Ga Sikulehu, adopt technical process of the present invention and processing condition, converting halogen production low-sodium carnalite solution operation adjustment mother liquor component selects to the full altogether point of carnallitite, epsom salt and sylvite place, the consumption method of calculation of potassium saturated solution, old halogen, soft potassium mother liquor are according to the chemical ingredients in potassium saturated solution, old halogen, the soft potassium mother liquor, use Na ⁺, K ⁺, Mg ²⁺/ Cl ^-, SO ₄ ^2--H ₂The O penton is a phasor, 25 ℃ of following analytical calculations, is blended into the old halogen of 1.5 times of carnallitite bittern amounts, separates out carnallitite and gets final product.Recrystallization is produced soft potassium mixed salt solution operation and is made that to mix consumption method of calculation that back bittern component reaches schoenite and sylvite saturated line place potassium mixed salt solution, low-sodium carnalite solution, potassium sulfate mother liquid be chemical composition according to potassium mixed salt solution, low-sodium carnalite solution, potassium sulfate mother liquid, uses Na ⁺, K ⁺, Mg ²⁺/ Cl ^-, SO ₄ ^2--H ₂The O penton is a phasor, 25 ℃ of following analytical calculations.Can produce qualified potassium product by above method.

Claims

1, a kind of saltpan method is produced the method for vitriolate of tartar, it is characterized in that: (one), technical process be the salt pan evaporation produce the potassium mixed salt solution, convert halogen produce low-sodium carnalite solution, recrystallization produce soft potassium mixed salt solution, salt pan evaporate potassium product; (2), processing condition are that salt pan evaporation production potassium mixed salt solution operation is to dewater in salt Tanaka evaporation with vitriolate type bittern to separate out sodium salt or epsom salt, when treating that the potassium mixed salt is saturated, solid-liquid separation gets sodium salt or epsom salt solid and potassium saturated solution, the potassium saturated solution dewaters in the salt pan evaporation and separates out the potassium mixed salt, when treating that bischofite is saturated, solid-liquid separation gets the potassium mixed salt, the potassium mixed salt be dissolved in water the potassium mixed salt solution; Converting halogen production low-sodium carnalite solution operation is to convert halogen with potassium saturated solution, old halogen and soft potassium mother liquor, adjusting the mother liquor component selects to the full altogether point of carnallitite, epsom salt and sylvite place, evaporation dewaters and makes carnallitite saturated, be blended into 0.3-3 old halogen doubly and separate out low-sodium carnalite, discharge mother liquor and get the low-sodium carnalite solid, low-sodium carnalite be dissolved in water low-sodium carnalite solution; Recrystallization is produced soft potassium mixed salt solution operation potassium mixed salt solution, low-sodium carnalite solution and potassium sulfate mother liquid is mixed, and make mixing back bittern component reach schoenite and sylvite saturated line place, evaporation removes the water crystallization soft potassium mixed salt, solid-liquid separation when treating that sodium-chlor is saturated, its mother liquor is soft potassium mother liquor, it returns and converts halogen and produce low-sodium carnalite solution operation, the solid soft potassium mixed salt be dissolved in water soft potassium mixed salt solution; The salt pan evaporate the potassium product operation with soft potassium mixed salt solution at salt Tanaka evaporative crystallization vitriolate of tartar, solid-liquid separation gets potassium product when treating that other salt is saturated, its mother liquor is a potassium sulfate mother liquid, it returns recrystallization and produces in the soft potassium mixed salt operation.