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Process for preparing magnesium sulfate heptahydrate

A magnesium sulfate heptahydrate, process technology, applied in the direction of magnesium sulfate, etc., to achieve the effect of good product quality, no environmental pollution, and short process flow

Inactive Publication Date: 2014-02-26
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

[0004] The technical problem to be solved by the present invention is to provide a preparation of waste salt containing magnesium sulfate heptahydrate by using sulfuric acid type salt lakes with short process flow, good product quality and no environmental pollution for utilizing the waste salt containing magnesium sulfate heptahydrate produced in the process of producing potash fertilizer The process of magnesium sulfate heptahydrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This embodiment includes the following steps:

[0015] (1) Crushing and grinding: will contain MgSO 4 ·7H 2 O mass fraction is that the tailings of 43.2% potash and magnesium fertilizer workshop are broken, then carry out ore grinding, and the ore particle size after the ore grinding is-2mm mass content is 70%;

[0016] (2) Melting: Add the crushed ore obtained in step (1) and the saturated brine and fresh water from the diarrhoea salt field into the hot melting tank according to the ratio of ore: brine: fresh water mass ratio = 1: 0.1: 2.1. Heating to 75°C under stirring, filtering, the filter residue is discharged to the potassium mixed salt field, and the filtrate is sent to the crystallization process;

[0017] (3) Crystallization: Send the hot filtrate obtained in step (2) to the crystallizer, add fresh water at 80°C according to the ratio of fresh water: filtrate mass ratio = 0.03:1, stir in the crystallizer for 18 hours, and then cool down to 20°C , get slurry...

Embodiment 2

[0022] This embodiment includes the following steps:

[0023] (1) Crushing and grinding: will contain MgSO 4 ·7H 2 O mass fraction is 82.7% the tailings beneficiation concentrate of potassium magnesium fertilizer workshop is crushed, then carries out ore grinding, after ore grinding, ore grain size is that the mass content of-2mm is 65%;

[0024] (2) Melting: Add the crushed ore obtained in step (1) and the saturated brine and fresh water from the diarrhoea salt field into the hot melting tank according to the ratio of ore: brine: fresh water mass ratio = 1: 0.1: 1.3. Heating to 75°C under stirring, filtering, the filter residue is discharged to the potassium mixed salt field, and the filtrate is sent to the crystallization process;

[0025] (3) Crystallization: Send the hot filtrate obtained in step (2) to the crystallizer, add fresh water at 80°C according to the ratio of fresh water: filtrate mass ratio = 0.01:1, stir in the crystallizer for 24 hours, and then cool down t...

Embodiment 3

[0030] This embodiment includes the following steps:

[0031] (1) Crushing and grinding: will contain MgSO 4 ·7H 2 O mass fraction is that the tailings of 34.7% potash and magnesium fertilizer workshop are broken, then carry out ore grinding, the ore grain size after the ore grinding is that the mass content of-2mm is 80%;

[0032] (2) Hot melt: Add the crushed ore obtained in step (1) and the saturated brine and fresh water from the diarrhoea salt field into the hot melting tank according to the ratio of ore: brine: fresh water mass ratio = 1: 0.2: 1.8. Heating to 78°C under stirring, filtering, the filter residue is discharged to the potassium mixed salt field, and the filtrate is sent to the crystallization process;

[0033] (3) Crystallization: Send the hot filtrate obtained in step (2) to the crystallizer, add fresh water at 78°C according to the ratio of fresh water: filtrate mass ratio = 0.01:1, stir in the crystallizer for 24 hours, and then cool down to 22°C , get ...

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Abstract

The invention discloses a process for preparing magnesium sulfate heptahydrate, which comprises the following steps of: (1) crushing and grinding; (2) hot melting; (3) crystallizing; (4) centrifugally separating; and (5) washing and drying a filter cake. According to the process for preparing magnesium sulfate heptahydrate, the product yield is 70 percent, the mass fraction of the magnesium sulfate heptahydrate is 98 percent, and the first-class requirement of magnesium sulfate heptahydrate of international industry is reached. Compared with the traditional magnesium sulfate heptahydrate, the process has a short flow, product quality is good, and the process has no environmental pollution.

Description

technical field [0001] The invention relates to a process for preparing magnesium sulfate heptahydrate, in particular to a process for preparing magnesium sulfate heptahydrate by using waste salt produced in the production process of magnesium sulfate subtype salt lake potash fertilizer. Background technique [0002] Magnesium Sulfate Heptahydrate (also known as Epsom Salt, MgSO 4 ·7H 2 O) is an important inorganic chemical product, which is widely used in agriculture, medicine, microbial industry, light industry, chemical industry, printing and dyeing industry, pharmaceutical industry, electroplating smelting and other fields. At present, there are two main types of manufacturing processes for magnesium sulfate heptahydrate. One type is to utilize sulfuric acid to react with magnesium-containing minerals. This type of method is generally to add sulfuric acid to soak in magnesium-containing solid minerals, and then crystallize the solution to obtain magnesium sulfate produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40
Inventor 谢超孙成高季荣李昱昀高文远汤建良
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN