CN1042823C

CN1042823C - Method for preparation of lemery salt

Info

Publication number: CN1042823C
Application number: CN94110997A
Authority: CN
Inventors: 李气新; 苏必忠
Original assignee: CHANGSHA CHEMICAL MINING DESIGN INST MINISTRY OF CHEMICAL INDUSTRY
Current assignee: CHANGSHA CHEMICAL MINING DESIGN INST MINISTRY OF CHEMICAL INDUSTRY
Priority date: 1994-05-17
Filing date: 1994-05-17
Publication date: 1999-04-07
Anticipated expiration: 2014-05-17
Also published as: CN1093679A

Abstract

The present invention relates to a method for preparing potassium sulfate by the reaction of potassium chloride and sulphuric acid, which comprises potassium bisulfate prepared by the reaction of potassium chloride and sulphuric acid is added into an ammonification pot which contains potassium sulfate as a washing liquid; then, potassium chloride and a proper quantity of clear water are added; subsequently, ammonia, ammonium bicarbonate or ammonium carbonate is added, and the reactants are separated by a filtering machine after ammonification reaction; and finally, the reactants are washed by adding clear water to obtain the potassium sulfate. The method has the advantages of simple technology, low cost, and investment saving by more than 70%; the recovery rate of potassium contained in the raw materials can reach more than 82%, the content of K2O contained in product is not less than 50%, and the content of chlorine ions is not more than 1.5%. The method is suitable for newly established enterprises, and old long-term enterprises can also obtain efficiency in multiples by slightly modifying the prior art.

Description

Method for preparation of lemery salt

The invention belongs to the method for producing vitriolate of tartar with Repone K and effect of sulfuric acid.

At present, it is a lot of to transform the method for producing vitriolate of tartar with Repone K, mainly contains Mannheim proeess: saltcake, ammonium sulfate, soft potassium magnesium vanadium or potassium mixed salt transform the Repone K method; Gypsum transforms Repone K method and solvent extraction sulfuric acid conversion ammonification potassium method.In aforesaid method, Mannheim proeess is because of relating to the special-purpose stove of high temperature and design, material and anticorrosion problem, and investment is high, and difficulty is big; The solvent extration technical process is long, and the equipment complexity is higher to environmental requirement; Transform the Repone K method with saltcake, schoenite or kainite, the raw material sources difficulty, cost is higher; Transform the Repone K method with ammonium sulfate, the rate of recovery of potassium has only 65%.

Purpose of the present invention, it is simple to provide a kind of production technique and equipment, the raw material abundance, the potassium rate of recovery is higher relatively, produces the method for vitriolate of tartar at a lower temperature.

Invention is achieved in that in filling the ammonification jar of vitriolate of tartar washings, add the sal enixum that makes with Repone K and effect of sulfuric acid, add Repone K and proper amount of clear water again, add ammonia or bicarbonate of ammonia or volatile salt then and carry out aminating reaction, behind the reaction terminating, change material over to filter and separate, and add the clear water washing, promptly obtain the solid phase potassium product.Washings is all returned the ammonification jar, and mother liquor gets the byproduct ammonium chloride after evaporation.The mol ratio that adds Repone K and sal enixum in the aminating reaction is 1: 1, and the mol ratio that adds ammonia or bicarbonate of ammonia and sal enixum is 1: 1, and the mol ratio that adds volatile salt and sal enixum is 1: 2.

Describe the present invention in detail below in conjunction with embodiment.

Repone K and sulfuric acid is stand-by by the sal enixum that liquid phase reaction makes in reactor.

In the ammonification jar that fills 86 milliliters of clear water and vitriolate of tartar washings, add the sal enixum that 136 grams make with Repone K and effect of sulfuric acid, add 74.5 gram Repone K, add 68 milliliters of 25% ammoniacal liquor then, constantly stirred 15～30 minutes, fully after, material is gone to filter separates, and add the clear water washing, get 151 gram potassium products after the drying.Washings all returns the ammonification jar, and mother liquor gets the byproduct ammonium chloride after evaporation.

Technology of the present invention is simple, and equipment capacity is big, and raw material supply abundance, production cost are low, saves investment more than 70%, and the rate of recovery of potassium reaches more than 82% in the raw material, K in the potassium product ₂O content 〉=50%, chloride ion content≤1.5%.The present invention is applicable to newly-built enterprise, and the existing technology of long-established enterprise is transformed slightly, will obtain benefit at double equally.

Claims

1. produce the method for vitriolate of tartar with Repone K and effect of sulfuric acid, be in the ammonification jar, to add the sal enixum that makes with Repone K and effect of sulfuric acid, add proper amount of clear water and ammonia again and carry out aminating reaction, behind the reaction terminating, changing material over to filter separates, and add clear water washing, promptly obtain potassium product, it is characterized in that: in the aminating reaction, can add ammonia, also can be to add bicarbonate of ammonia or volatile salt, and the mol ratio that adds ammonia or bicarbonate of ammonia and sal enixum is 1: 1, the mol ratio that adds volatile salt and sal enixum is 1: 2, the Repone K of adding and sal enixum equimolar amount before adding ammonia or bicarbonate of ammonia or volatile salt, and the vitriolate of tartar washings all returns the ammonification jar.