Method for preparing ammonium magnesium sulfate hexahydrate from giobertite

A magnesium ammonium sulfate and magnesite technology, applied in the direction of magnesium sulfate, ammonium sulfate, sulfate preparations, etc., can solve the problems of high production cost, complicated cost and so on

Inactive Publication Date: 2009-08-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since magnesite contains a variety of high-content metal impurities such as calcium and iron, the subsequent purification and refining treatment is complicated and costly
[0003] The synthetic method of ammonium magnesium sulfate us

Method used

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  • Method for preparing ammonium magnesium sulfate hexahydrate from giobertite
  • Method for preparing ammonium magnesium sulfate hexahydrate from giobertite

Examples

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Embodiment 1

[0045] see figure 1 , put the magnesite into the roasting furnace 1, roast at 750°C for 2 hours, place it in the pulverizer 2 for fine grinding and pass through a 100-mesh sieve for later use. Add 1L of water into the 2L reaction kettle 3 with condensation and reflux, heat it to 100°C, add 220g of roasted magnesite powder into the reaction kettle, stir well, then gradually add 730g of ammonium sulfate and stir for 60min; Absorb with water. Lower the temperature of the slurry in the reaction kettle to 70° C., adjust its pH value to 8.2 with ammonia water in the sedimentation tank 4, stir for 30 minutes, and filter through the first filter 5 to obtain a filtrate. Transfer the filtrate to the crystallizer 6, add 1200 g of 50% ammonium sulfate solution and stir thoroughly, at 60°C, crystallize for 60 minutes and filter through the second filter 7, put the filter cake in the drier 8, and bake at 60°C Dry for 2 hours to obtain ammonium magnesium sulfate hexahydrate crystals (see ...

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Abstract

The invention discloses a method for preparing ammonium magnesium sulfate hexahydrate from magnesite, which comprises the following steps: A) performing activated roasting on the magnesite; B) preparing a magnesium sulfate solution by leaching roasted powder of the magnesite by ammonium sulfate, and removing iron ions by regulating the pH value; and C) mixing and crystallizing the magnesium sulfate solution prepared in the step B and an ammonium sulfate solution, and filtering and drying the obtained product to obtain ammonium magnesium sulfate hexahydrate crystals. A washing liquid and a filtrate during the production can be circularly used. The method is characterized in that the method utilizes the ammonium sulfate to ensure that magnesium is quickly dissolved out from the roasted magnesite and calcium is not dissolved out, realizes the separation of the calcium and the magnesium, improves the overall production efficiency, and reduces the production cost for ammonium magnesium sulfate.

Description

technical field [0001] The invention relates to a process for producing ammonium magnesium sulfate hexahydrate, in particular to a process for preparing ammonium magnesium sulfate hexahydrate by leaching roasted magnesite with ammonium sulfate, and belongs to the technical field of inorganic chemical industry. Background technique [0002] The preparation of magnesite chemical raw materials from magnesite is generally made by first turning the magnesium in magnesite into soluble magnesium salt through acid, and then purified and refined. However, since magnesite contains a variety of high-content metal impurities such as calcium and iron, the subsequent purification and refining treatment is complicated and costly. [0003] The synthetic method of ammonium magnesium sulfate usually adopts magnesium sulfate and ammonium sulfate as raw material to prepare ammonium magnesium sulfate hexahydrate, as Jayakumar, V.S. (Physica Status Solidi (A) Applied Research, 1988, 109 (2): 635-...

Claims

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Application Information

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IPC IPC(8): C01F5/40C01C1/24C01B17/96
Inventor 卢旭晨王体壮闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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