I.　Background　Technology:　

Chinese　Tibet,　Qinghai,　Xinjiang,　Inner　Mongolia　and　Shanxi　have　ample　salt　lake　resources,　deposited　with　a　good　deal　of　bloedite.　However,　there　is　little　domestic　research　regarding　comprehensive　utilization　of　bloedite　for　the　time　being.　Some　units　proposed　the　process　of　purifying　sodium　sulfate　with　alkaline　process,　but　magnesium　hydroxide　is　hard　to　be　separated　during　the　process,　therefore,　industrialization　has　not　been　realized　yet.　Other　units　adopt　high　and　low　temperature　crystallization　process　to　achieve　magnesium　sulfate　heptahydrate,　but　energy　consumption　is　high　during　the　process,　magnesium　sulfate　additional　value　is　low,　so　it　is　very　difficult　for　investors　to　obtain　economic　benefits.　In　a　word,　in　the　aspect　of　comprehensive　utilization　of　bloedite,　China　is　still　in　the　starting　stage.

II.　This　Process　Features:　

Take　bloedite　or　sodium　sulfate　-bloedite　complex　ore　as　raw　material,　and　sodium　hydroxide　or　ammonia　as　precipitant,　precipitate　the　magnesium　in　it,　prepare　electronic　grade,　oil　grade　and　flame-retardant　grade　high-purity　magnesium　hydroxide;　use　special　separation　process　to　extract　the　sodium　sulfate　and　prepare　sodium　sulfate　product　in　conformity　with　industrial　standard.　Yield　level:　sodium　sulfate　97%;　magnesium　86%.　Environmental　protection:　no　three　wastes　discharge.

　

III.　Product　Quality:　

High-purity　extra　fine　flame-retardant　grade　magnesium　hydroxide:　

Item	Standard	Item	Standard
Mg　(OH)/%　　　　　　≥	98.2	Fe/%≤	0.002
CaO/%　　　　≤	0.2	Heavy　metal　ppm	30
Cl-/%　　　　　　　≤	5　-　10	Mn/%≤	0.003
SO42-/%　　　≤	0.1	Particle　diameter　μm　(primary　particle　diameter)	0.5　-　1

Electronic　grade　magnesium　hydroxide:　

Indicator	Content　(High-purity　Grade)	Content　(Ordinary　Grade)	Indicator	Content　(High-purity　Grade)	Content　(Ordinary　Grade)
Magnesium　hydroxide　content/%≥	99.8	98	Iron/%≤	0.05	0.05
Calcium　oxide/%≤	0.05	0.1	Heavy　metal/%≤	0.001	0.002
Insoluble　matter　in　acid/%≤	0.01	0.01	Potassium+sodium/%≤	0.001	0.03
Chloride/%≤	0.01	0.02	Boron　/%≤	0.001	0.002
Sulfate/%≤	0.01	0.01	Screenings　50μm/%≤	0.5	1.0

Sodium　sulfate　product　mass:　

Sodium　sulfate　content≥98%;　magnesium　sulfate　content　0.3-1.5%

IV.　Economic　Benefits:

1.　Composition　of　raw　ore:　sodium　sulfate　41%,　magnesium　sulfate　28%;　(according　to　the　ore　sample　provided　by　one　company　Inner　Mongolia)　

2.　Total　investment　for　processing　1,000kg　raw　ore:　1,254.5　Yuan;　

3.　Total　output　for　processing　1,000kg　raw　ore:　1,980　Yuan;　

4.　Net　profit　for　processing　1,000kg　raw　ore:　725　Yuan.

V.　Investment　Scale:　

It　is　up　to　the　actual　circumstance.　According　to　daily　treatment　of　100t　raw　ore,　equipment　investment　is　about　4　million　Yuan.

VI.　Way　of　Cooperation:　

Technical　transfer.　Taking　responsibility　for　process　flow　design,　supporting　equipment　of　standard　equipment,　non-standard　equipment　manufacture　design,　equipment is　plane　layout　design,　equipment　installation　design,　pipe　network　design,　equipment　installation　guidance,　equipment　commissioning,　production　commissioning,　training　for　production　engineers,　analysis　staff　and　technicians,　process　operation　specifications,　raw　material　and　product　analysis　method,　and　preparation　of　intermediate　control　analysis　method;　ensuring　output,　yield　and　quality　to　reach　the　standard;　and　undertaking　turn-key　projects.