I.　Process　Introduction

Applicable　raw　material　of　this　process　is　magnesium　chloride,　magnesium　sulfate　(boron　magnesium　fertilizer),　brine,　and　mother　liquid　of　boric　acid　produced　with　boron　and　magnesium　mineral　as　raw　material　and　single-step　method.　The　process　is　to　dissolve,　purify　and　precipitate　the　above　raw　material,　take　liquid　supernatant　to　react　with　precipitant,　generate　basic　magnesium　carbonate　or　magnesium　hydroxide　precipitation,　then　produce　basic　magnesium　carbonate　or　magnesium　hydroxide　wet　cake　through　rinsing,　dehydrating.　According　to　different　product　varieties,　under　different　temperature　conditions,　produce　different　varieties　of　high-purity　magnesium　oxide　products　through　heat　treatment.　Mother　liquid　generated　from　the　process　reacts　with　hydroxide　or　oxide　of　alkaline-earth　metal,　volatilize　ammonia,　react　with　carbon　dioxide　from　magnesium　oxide　calcination　procedure　through　absorption,　and　produce　ammonium　carbonate　solution.

II.　Technical　Advancement

Magnesium　conversion　rate　is　above　85%,　and　product is　main　content　is　within　98.6%-99.4%.　Product　quality　is　in　conformity　with　the　requirements　of　medical　(food),　electronics,　electrician,　metallurgy,　aerospace,　high　molecular　and　other　fields.

III.　Market　Prospect

Magnesium　oxide　is　important　inorganic　chemical　product,　which　is　widely　applied　in　rubber,　medicine,　food,　electronic,　refractory　material,　metallurgy,　national　defence,　aerospace,　chemical　industry,　environmental　protection　and　other　fields,　playing　a　very　important　role　in　the　construction　of　national　economy.　In　recent　years,　domestic　and　foreign　market　has　growing　demand　for　magnesium　oxide,　appearing　the　situation　of　demand　exceeding　supply.　The　market　prospect　is　very　broad.

IV.　Technical　Sources

Autonomous　research　and　development,　and　industrialization　has　been　realized　in　Shandong,　Qinghai　and　other　places.

V.　Product　Quality

Table　1:　

Indicator　Name	Standard	Indicator　Name	Standard
MgO/%	98.5	Sulfate/%　　　　　　≤	0.1
CaO/%　　　　　　　≤	0.25	Fe/%　　　　　　　　　　≤	0.0005
Insoluble　matter　in　acid/%　　　≤	0.05	Heavy　metal　(Pb)　ppm≤	20
Cl-/%　　　　　　　　≤	0.08	Bulk　density　g/ml	0.25　-0.6

Table　2:　

Indicator　Name	Standard	Indicator　Name	Standard
MgO/%	99.5	Sulfate/%　　　　　　≤	0.1
CaO/%　　　　　　≤	0.15	Fe/%　　　　　　　　　　≤	0.005
Insoluble　matter　in　acid/%　　≤	0.05	Heavy　metal　(Pb)　ppm≤	10
Cl-/%　　　　　　　≤	0.08	Bulk　density　g/ml	0.35

VI.　Investment　Scale

According　to　annual　production　of　high-purity　magnesium　oxide　1000t,　equipment　investment　is　3.5　million　Yuan.

VII.　Environmental　Protection　

Traditional　magnesium　carbonate　synthesis　process.　Production　process　will　generate　a　good　deal　of　ammonia-containing　waste　water,　causing　environmental　pollution,　which　has　become　the　burden　of　production　enterprises.　Shandong　Qingzhou　Hongji　Chemical　Industry　Co.,　Ltd.　was　forced　to　stop　production　in　2006　because　mother　liquid　discharge　caused　environmental　pollution.　In　order　to　solve　this　problem,　this　process　is　supported　with　comprehensive　utilization　technology　and　device　of　magnesium　carbonate　mother　liquid.　The　mother　liquid　and　washing　water　generated　during　production　is　used　in　recovery　of　ammonia　(ammonia　water)　for　cycle　use,　thoroughly　eliminating　environmental　pollution　caused　by　mother　liquid　and　washing　water　discharge.　

In　addition,　calcine　basic　magnesium　carbonate　into　magnesium　oxide,　a　good　deal　of　carbon　dioxide　gas　discharge　during　the　process,　this　is　not　allowed　in　the　current　environmental　protection　policy.　In　order　to　solve　this　problem,　this　process　also　developed　the　matched　carbon　dioxide　recovery　process,　and　made　carbon　dioxide　react　with　the　recovered　ammonia　water,　transformed　into　ammonium　carbonate　solution,　and　recycle　in　precipitation　reaction　of　basic　magnesium　carbonate.

VIII.　Economic　Benefits

Product　production　cost　is　about　6,500　Yuan/T,　factory　price　is　12,000-30,000　Yuan/T,　having　high　additional　value,　extremely　big　profit　space　and　significant　economic　benefits.

IX.　Form　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.