Technology for preparing kainite with potassium-containing heptahydrate epsomite raw product

A technology of langbeinite and crude products, which is applied in the field of preparation technology of kabeinite, can solve the problems of inability to directly obtain potassium salt products and high energy consumption, and achieve low production cost, low energy consumption, and low dissolution temperature Effect

Active Publication Date: 2014-04-23
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is little research on the recovery and utilization of this part of potassium salt. In a small number of reports, the recrystallization method is generally used to purify magnesium sulfate he

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment includes the following steps:

[0020] (1) Mix the crude product of potassium-containing epsomium heptahydrate salt (which contains 4wt% of potassium ions) with the mother liquor of epsomium salt saturated with magnesium sulfate, which is equivalent to 1 times the quality of the crude product of potassium-containing epsomium heptahydrate salt. The ion concentration is 5 wt%, then add it into a hot melting tank and heat it to 70°C, keep it warm and dissolve for 0.5 hours to get hot brine;

[0021] The crude product of the potassium-containing Heptashui Xie Li salt is an intermediate product obtained by removing part of the sodium chloride from the Xie Li Salt Field Mine by means of flotation;

[0022] (2) Insulating and filtering the hot brine obtained in step (1), the filter residue is coarse kainite, the purity of kainite is 75%, and the yield of potassium ions is 70%;

[0023] (3) Adding the coarse kainite obtained in step (2) to water equivalent to 1...

Embodiment 2

[0026] This embodiment includes the following steps:

[0027] (1) Mix the crude potassium-containing heptahydrate salt (which contains 4wt% of potassium ions) with an old brine mother liquor saturated with magnesium sulfate that is equivalent to 1 times the quality of the potassium-containing heptahydrate salt crude product, and the mother liquor magnesium The ion concentration is 8 wt%, then add it into a hot melting tank and heat it to 70°C, keep it warm and dissolve for 2 hours to get hot brine;

[0028] The crude product of the potassium-containing Heptashui Xie Li salt is an intermediate product obtained by removing part of the sodium chloride from the Xie Li Salt Field Mine by means of flotation;

[0029] (2) Insulating and filtering the hot brine obtained in step (1), the filter residue is coarse kainite, the purity of kainite is 80%, and the yield of potassium ions is 75%;

[0030] (3) The coarse kainite obtained in step (2) is reslurried and washed by adding water eq...

Embodiment 3

[0033] This embodiment includes the following steps:

[0034] (1) Mix the crude potassium-containing heptahydrate salt (which contains 4wt% of potassium ions) with the old brine mother liquor saturated with magnesium sulfate that is equivalent to 3 times the quality of the potassium-containing heptahydrate salt crude product, and the mother liquor magnesium The ion concentration is 8wt%, then add it to a hot melting tank and heat it to 70°C, keep it warm and dissolve for 3 hours to get hot brine;

[0035] The crude product of the potassium-containing Heptashui Xie Li salt is an intermediate product obtained by removing part of the sodium chloride from the Xie Li Salt Field Mine by means of flotation;

[0036] (2) Insulating and filtering the hot brine obtained in step (1), the filter residue is coarse kainite, the purity of kainite is 90%, and the yield of potassium ions is 65%;

[0037] (3) The coarse kainite obtained in step (2) is reslurried and washed by adding water equi...

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Abstract

The invention relates to a technology for preparing kainite with a potassium-containing heptahydrate epsomite raw product. The technology comprises the following steps: (1) mixing brine according to the mass ratio of the potassium-containing heptahydrate epsomite raw product to magnesium sulfate saturated epsomite mother liquor or old brine being 1:(1-3), then adding in a heating fluid bowl for heating to 60-90 DEG C, preserving the heat for dissolution for 0.5-4 hours to obtain hot brine; (2) preserving the heat and filtering the hot brine obtained in the step (1), wherein the filter residue is crude kainite; (3) adding water with the amount of 1-4 times of the weight of the crude kainite equivalently to the crude kainite obtained in the step (2) and then washing with slurry to obtain high-quality kainite and potassium-containing repulping water; (4) returning the potassium-containing repulping water obtained in the step (3) to the step (1) to replace the epsomite mother liquor or old brine used in the step (1). According to the technology, the flow is simple, the solution temperature is low, the energy consumption is low, the production cost is low and economic benefits are good.

Description

technical field [0001] The invention relates to a preparation process of kainite, in particular to a process for preparing kainite from crude potassium-containing heptahydrate salt obtained by flotation. Background technique [0002] Potassium sulfate is a long-term shortage of chlorine-free potassium fertilizer in my country, and magnesia is an intermediate product for the preparation of potassium sulfate, and its chemical formula is KCl MgSO 4 2.75H 2 O. The langbeinite is processed into langbeinite, and then converted into potassium sulfate by adding potassium chloride through metathesis reaction; or adopting the process route disclosed in the patent application with application number 201080019037.9 to prepare potassium sulfate, ammonium sulfate, etc. by reacting with ammonia. [0003] At present, the main preparation process of kubeinite is that after the sulfuric acid salt lake brine is concentrated by sunlight to precipitate sodium chloride and epsom salt, the mothe...

Claims

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Application Information

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IPC IPC(8): C01D5/12C01D3/06
Inventor 谢超高文远曾召刚汤建良郑贤福
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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