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Method of preparing high purity magnesiun sand using salt lake bischofite as raw material

A high-purity magnesia and magnesia technology, applied in the direction of magnesia, can solve the problems of poor filtration and washing performance, difficulty in ammonium chloride recovery, high free ammonia concentration, and achieve low boron content, low production cost, and equipment capacity. high effect

Inactive Publication Date: 2006-04-19
青海西部镁业有限公司
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Problems solved by technology

but Mg(OH) 2 Settling, filtration and washing performance are still relatively poor, the moisture content of the filter cake is still above 30%, and the raw seawater or brine before the reaction still needs to be pretreated to remove boron
Both brine and ammonia water need to be diluted, the by-product ammonium chloride is difficult to recover, the volume of materials is large, the equipment capacity is low, and the production cost is high
The concentration of free ammonia in the reaction system is high, which is easy to cause environmental pollution

Method used

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  • Method of preparing high purity magnesiun sand using salt lake bischofite as raw material

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Embodiment Construction

[0029] ① Prepare high-concentration brine

[0030] Add 900Kg of bischofite and 400Kg of deionized water into the dissolution tank, stir and dissolve at room temperature, and filter with a filter press or vacuum filtration equipment to obtain MgCl 2 1000L of brine with a concentration of about 450g / L;

[0031] ② Preparation of reaction bottom liquid

[0032] In a magnesium sink tank with a volume of 2000L, first add 500L of deionized water, and then add 40Kg of magnesium hydroxide as a seed crystal to form a reaction bottom liquid;

[0033] ③ Magnesium precipitation reaction

[0034] Add 1500L of ammonium chloride mother liquor and 380Kg of lime into a 3000L ammonia distilling tank, heat it with steam, and pass the ammonia produced by the reaction into the magnesium sinking tank; at the same time, slowly add the prepared 1000L brine to the tank under stirring. The magnesium precipitation reaction is carried out in the magnesium precipitation tank, and the temperature is cont...

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Abstract

A process for preparing high-purity magnesium sand from the bischofite of salt lake includes such steps as preparing high-concentration saline from bischofite, depositing magnesium by ammonia method including adding crystal seeds, controlled reacting, depositing particles of magnesium hydroxide, filtering, washing, drying and two-step calcining to obtain target product containing MgO (more than 99.95%).

Description

Technical field: [0001] The invention relates to the field of metallurgy, in particular to a method for preparing high-purity magnesia by using salt lake bischofite as a raw material, adopting an ammonia method for magnesia precipitation and two-step calcination. Background technique: [0002] The salt lake bischofolite referred to in the present invention refers to a kind of solid magnesium chloride crystalline hydrate (MgCl) which is discharged from the salt lake intercrystalline brine after producing potash fertilizer (KCl), through natural evaporation, concentration and crystallization. 2 ·6H 2 O), and high-purity magnesia is an important refractory material indispensable to the iron and steel industry. In foreign countries, almost all high-purity magnesia is prepared from seawater or brine, through lime milk precipitation and high-temperature calcination. In China, only Liaoning Province can produce high-purity magnesia at present, and it uses magnesite as raw materia...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/22C01F5/02
Inventor 徐徽李新海陈白珍石西昌刘荣义马雅琳邓新荣
Owner 青海西部镁业有限公司