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

A technology of high-purity magnesia and schlorite, applied in the direction of magnesia, etc., can solve the problems of poor filtration and washing performance, difficult recovery of ammonium chloride, and large amount of material running, and achieve good filtration and washing performance, which is beneficial to removal and Separation, the effect of high equipment productivity

A technology of high-purity magnesia and schlorite, applied in the direction of magnesia, etc., can solve the problems of poor filtration and washing performance, difficult recovery of ammonium chloride, and large amount of material running, and achieve good filtration and washing performance, which is beneficial to removal and Separation, the effect of high equipment productivity

CN1618998AInactive Publication Date: 2005-05-25青海西部镁业有限公司
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  • Method of preparing high purity magnesiun sand using salt lake bischofite as raw material

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Embodiment Construction

[0043] ① Prepare high-concentration brine

[0044] 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;

[0045] ② Preparation of reaction bottom liquid

[0046] 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;

[0047] ③ Magnesium precipitation reaction

[0048] Add 1500L of ammonium chloride mother liquor and 380Kg of lime into a 3000L ammonia distillation tank, heat with steam, and pass the ammonia produced by the reaction into the Shenmei tank. At the same time, slowly add the prepared 1000L brine into the Shenmei tank to carry out the magnesium precipitation reaction under stirring, and control the temperature at 70-80°C.

[0049] ④ Sedimentation, fi...

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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

Patent Timeline
25 May 2005
Publication
CN1618998A
IPC
C01F5/02; C22B26/22
Inventors
徐徽; 李新海