CN108394920A - A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite - Google Patents
A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite Download PDFInfo
- Publication number
- CN108394920A CN108394920A CN201710065330.2A CN201710065330A CN108394920A CN 108394920 A CN108394920 A CN 108394920A CN 201710065330 A CN201710065330 A CN 201710065330A CN 108394920 A CN108394920 A CN 108394920A
- Authority
- CN
- China
- Prior art keywords
- magnesium
- sulfite
- solution
- sodium
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/20—Magnesium hydroxide by precipitation from solutions of magnesium salts with ammonia
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a kind of techniques preparing magnesium hydroxide, sodium sulfite product as raw material using magnesium sulfite, saltcake and carbide slag；Detailed process is to make it dissolve magnesium sulfite acidification and release sulfur dioxide gas, acidifying solution is carried out after neutralizing oxidation removing insoluble residue, it is separately added into the magnesium sinkings agent such as transforming agent and ammonium hydroxide, sodium hydroxide in magnesium salt solution and generates magnesium hydrate precipitate, magnesium hydroxide products are obtained through being separated by solid-liquid separation；Filtrate is that deliquescent ammonium sulfate, sodium sulphate, ammonium chloride or calcium chloride return process system recycle, or continuously add milk of lime in ammonium sulfate and ammonium chloride solution and generate ammonia and gypsum, and ammonia is made to obtain recycling utilization.Sulfur dioxide gas, which is passed through to react in the suspension that saltcake is made into milk of lime, is converted into sodium sulfite and gypsum deposition, and sodium sulfite product is obtained through being separated by solid-liquid separation, and washed filter cake is gypsum by-product；The present invention utilizes solid waste preparing magnesium hydroxide and sodium sulfite product, and production cost is low, environment and remarkable in economical benefits.
Description
Technical field
The invention belongs to chemical technology field, it is related to a kind of with magnesium sulfite solid waste preparing magnesium hydroxide and sodium sulfite
Technique；More specifically it is that hydroxide is produced by metathesis reaction using Industrial Solid Wastes such as magnesium sulfite, carbide slag, sodium sulphate
The technique of magnesium, sodium sulfite and by-product gypsum.
Technical background
Magnesium processes desulfurization generates a large amount of magnesium sulfite Industrial Solid Waste, molecular formula MgSO3·6H2O is slightly soluble in water, has strong also
Originality is directly discharged into after environment to the very harmful of natural water and biology；Carbide produces polyvinyl chloride enterprise and salt chemical engineering
Enterprise generates a large amount of carbide slag and saltcake solid waste；Carbide slag is the Industrial Solid Waste of Production of PVC firms output, and composition is
Ca(OH)2In strong basicity, it is directly discharged into environment and will also result in pollution；Saltcake is also known as " anhydrous sodium sulphate ", and composition is sodium sulphate Na2SO4,
It is soluble easily in water, be discharged into after environment the salination that can cause soil；As the fast development of domestic chemical industry leads to up to ten million tons
Industrial Solid Waste can not handle, seriously overstock.Since these Industrial Solid Wastes take the mode of air storage, the cinder field of formation mostly
Often pile up like a mountain, not only land occupation, but also easily is caused to be lost in and pollution of ecological environment by erosion by wind and rain.
Magnesium hydroxide is a kind of inorganic fire-retarded filler for the organic polymer based composites that application prospect is good.Magnesium system is fire-retardant
Agent by it is heated when chemical breakdown absorb heat and release be discharged and play fire retardation, therefore have nontoxic, low cigarette and decomposition
The magnesia chemical property that generates afterwards is stablized, the advantages that not generating secondary pollution, and magnesium flame retardant is advantageously than aluminium hydroxide.
It is papermaking, coating, modeling since synthetic method magnesium hydroxide products have the characteristics that quality is pure, composition is stablized, impurity content is low
The inorganic filler that the industries such as material, rubber largely use, while being to produce pharmaceutical grade, food-grade, electron level, optical grade etc. to have again
High added value is special, fine and performance chemicals initial feed, the effect of can not be substituted.Chemically synthesized magnesium hydroxide
Activity is high, is the quality raw materials for substituting magnesia and being used for boiler flue gas desulfurization；It is the other magnesium based compound activity of production again
The primary raw material of magnesia, light magnesium carbonate, magnesium silicate and magnesium fluoride.
Sodium sulfite is the important source material for industries such as papermaking, chemical fibre, weaving, printing and dyeing, chemical industry.Paper industry is used for paper
Slurry removing lignin and delignified pulp toner；Chemical fibre industry is used for the stabilizer of chemical fibre；Textile industry is used as staple fibre
Stabilizer；Printing and dyeing industry is used for the boiling-off of various cotton fabrics, can prevent cotton fiber selective oxidation as deoxidier and bleaching agent
And fibre strength is influenced, and improve the whiteness of boiling-off object；Chemical industry is used as reducing agent and sulfonating agent, can prevent in reaction process
The oxidation of semi-finished product；Electronics industry is for manufacturing photo resistance；Water treatment industry is used for the processing of electroplating wastewater, drinking water；Such as
Anhydrous sodium sulfite is used as Lauxite and synthesizes the catalyst of addition elementary reaction, photosensitive industry as developer, is used as glue
Film developing etc.；Chemical use can protect oxysensible material not oxidized mainly as reducing agent, therefore be widely used as chemical work
Anti-aging agent, antioxidant, decolorising agent and neutralizer of industry etc..
The treatment technology of known existing magnesium sulfite solid waste is to force to blast in the low magnesium sulfite suspension of solubility
Air oxidation makes magnesium sulfite be oxidized to the magnesium sulfate for being dissolved in water, is then filtered to Adlerika and removes insoluble impurity,
Refined sulfuric acid magnesium filtrate send multiple-effect evaporation unit to evaporate, and is sold as fertiliser containing magnesium after concentrating out epsom salt crystallization.The technique
Advantage, which is magnesium processes desulfurizer, can directly produce sulfuric acid magnesium products；Defect is that magnesium sulfite oxidation needs to consume a large amount of compression
Air, when Adlerika condensing crystallizing, need to consume a large amount of thermal energy or power energy consumption, and most important problem is that magnesium sulfate is made
For agricultural fertiliser containing magnesium market cognition degree is low, price is low, therefore magnesium processes desulfurization enterprise is caused seldom to use magnesium sulfite direct oxidation
The process route of preparing magnesium sulfate.
Another prior art is anti-in magnesium processes desulfuration absorbing tower internal control hydrogen manufacturing magnesium oxide suspension and the sulphur dioxide in flue gas
Inhibit magnesium sulfite oxidation during magnesium sulfite should be generated, magnesium sulfite oxidation is not made to generate magnesium sulfate.Then by sulfurous
Sour magnesium precipitate object is separated by filtration, dries, roasts, and final high temperature is pyrolyzed into magnesia and high-concentration sulfur dioxide gas, is roasted
The magnesia arrived returns to desulphurization system recycling, is used for manufacturing sulfuric acid after sulfur dioxide flue gas cleaning dehydration.With traditional sulphur
Sulphur Sulphuric acid method compares with element sulfur raw material import is saved, and reduces the advantage of gas washing in SA production cost；But there are magnesium sulfite (6 water
Crystal) MgO activity produced of roasting high energy consumption, roasting method is small, the defects such as low that are back to desulfuration efficiency, and two when roasting
Sulfur oxide furnace gas leads to the problem of secondary pollution and is difficult to overcome.
In addition, production magnesium hydroxide mainly uses following several techniques both at home and abroad：
(1) magnesium hydroxide is made in brine-lime method；Its chemical equation is：
MgCl2+Ca(OH)2→CaCl2+Mg(OH)2↓
(2) magnesium hydroxide is made in brine-Ammonia Process；Its chemical equation is：
MgCl2+2NH3·H2O→Mg(OH)2↓+2NH4Cl
(3) calcined dolomite in powder Ammonia Process prepares magnesium hydroxide；
The production technology of above-mentioned magnesium hydroxide and other magnesium based compounds all needs a large amount of primary mineral resources of consumption and more
Kind industrial chemicals, therefore cause its production cost expensive and generate new solid waste and the generation of the ecological environment in mining area can not be repaiied
Multiple destruction.
Known sodium sulfite produciton technique absorbs SO using lye2Sodium sulfite is produced, production process need to consume largely
Caustic soda or soda ash, it is higher so as to cause production cost.
Above-mentioned existing magnesium sulfite fixed-end forces technology and the production technology of magnesium hydroxide and sodium sulfite product are by original
Expect the restriction for the factors such as of high cost, less economical, process conditions are harsh, hence it is evident that there are product energy consumption height, pollutions greatly, economic benefit
The defects of poor.
The purpose of the present invention is pass through double decomposition conversion process using several solid wastes such as magnesium sulfite, carbide slag, sodium sulphate
Preparing magnesium hydroxide and sodium sulfite product and by-product gypsum, the industry for converting the Industrial Solid Waste of low value to high added value are produced
Product have the economy and environmental benefit of " energy-saving, emission reduction synergy, turn waste into wealth ".Implement the achievable magnesium sulfite of the present invention
Resource recycling etc. several solid wastes utilizes, and makes that it is converted into the high value added products such as magnesium hydroxide, sodium sulfite and output is steady
The neutral gypsum by-product of state, and not will produce new pollutant in entire solid waste governance process.
Invention content
A kind of magnesium sulfite system low the purpose of the present invention is to provide production cost and that intermediate product can be made to recycle
Take the technology of magnesium hydroxide and sodium sulfite and by-product gypsum.The present invention is greatly lowered using solid waste as raw materials for production
The production cost of magnesium hydroxide and sodium sulfite, while several Industrial Solid Wastes such as can digest carbide slag and saltcake, make it obtain
It to resource recycling, reduces environmental pollution, for environmental protection and develops a circular economy a kind of new technology is provided.
The present invention is realized by following chemical reaction process and step.
Key reaction equation of the present invention is as follows：
MgSO3·6H2O+H2SO4→MgSO4+SO2↑ (1)
MgSO3·6H2O+HCl→MgCl2+SO2↑ (2)
MgSO4+NH3·H2O→Mg(OH)2↓+(NH4)2SO4 (3)
MgSO4+CaCl2→MgCl2+CaSO4·2H2O↓ (4)
MgCl2+NH3·H2O→Mg(OH)2↓+NH4Cl2 (5)
NH4Cl2+Ca(OH)2→NH4OH↑+CaCl2 (6)
Ca(OH)2+(NH4)2SO4→CaSO4·2H2O↓+2NH3↑+2H2O (7)
Ca(OH)2+Na2SO4+SO2→Na2SO3+NaHSO3+CaSO4·2H2O↓ (8)
NaHSO3+Na2CO3+Ca2++OH-→Na2SO3+CaCO3↓+H2O (9)
Magnesium sulfite solid waste double decomposition conversion preparing magnesium hydroxide and sodium sulfite according to embodiments of the present invention and by-product stone
The technique of cream includes：Magnesium sulfite is crushed, stirs and modulates into the magnesium sulfite suspension of concentration 20~60% in the reactor,
The strong acid for being slowly added to concentration 10~100% is acidified, and controls the addition of acid solution and magnesium sulfite slow mechanism dissolved is made to release SO2
Gas (send and produces sodium sulfite process), and it is all molten to magnesium sulfite to be stirred to react 1.0~6.0h for 40~90 DEG C of controlling reaction temperature
Stop acid adding after solution；Acidifying solution is heated to boiling and catches up with net SO2, continue to be stirred to react 1.0~2.0h；Then it is added in acidifying solution
Milk of lime Ca (OH)2PH=6~9 are neutralized to, and oxidizing removing of iron and manganese is added, filtering removal insoluble matter and calcium sulfate are residual
Alkaline magnesium sinking agent NH is added in slag in refined magnesium sulfate clear liquid3·H2O、NaOH、Ca(OH)2；In order to produce the hydrogen of high-quality
Magnesia, the separation of reinforced Ca-Mg ion, calcium chloride can also be added in magnesium sulfate makes it be converted into magnesium chloride, then again into
It is 20~60 DEG C that the molar ratio of row magnesium sinking, magnesium sinking agent and magnesium sulfate or magnesium chloride, which is 0.6~3.0: 1.0, is stirred to react temperature, so
Magnesium hydrate precipitate filtration washing is dried to obtain magnesium hydroxide products by 1.5~3.0h of ageing afterwards；Filter liquor is to be dissolved in water
Sulfate or villaumite recycle after adjusting concentration.
It is deployed into suspension with the carbide slag of the sodium sulphate of concentration 10~25% and concentration 10~40%；Sodium sulphate and stone
The molar ratio of grey breast is 1: 1.1~1.2, and above-mentioned magnesium sulfite is acidified the SO that dissolving is released2Conductance enters sulfur dioxide and absorbs instead
It answers and produces sodium sulfite in device, SO2Absorption be taken in closed container multi-stage countercurrent adsorb or under the conditions of action of forced stirring into
Capable, reaction temperature is 30~55 DEG C, and the reaction time is 2.0~6.0h, when measuring 4.0~6.5 pH of conversion fluid, SO2
Gas, which is switched in another stage reactor, carries out continuous absorption, is absorbing SO2A small amount of carbonic acid is added in the conversion fluid that gas has been saturated
Gypsum and insoluble residue are removed, the Asia of pH ≈ 8.0~9.5, a concentration of 15~30% is obtained with deliming, filtration washing in sodium solution
Metabisulfite solution；Then fraction of vulcanized sodium precipitation is added and removes heavy metal ion, is filtered to remove the sulfurous that will be refined after impurity
Acid sodium solution send evaporation and concentration.
Fe2++Na2S→FeS↓+2Na+, Mn2++Na2S→MnS↓+2Na+
Also there is following additional technical feature according to present invention process：
It is of the present invention in order to realize the high magnesium hydroxide of output added value, sodium sulfite product and gypsum by-product；It removes
Utilize three kinds of solid waste (MgSO3/Ca(OH)2/Na2SO4) except, Ca (OH) can also be substituted with quick lime2；The oxidant
For H2O2、O2、Na2O2、Na2S2O8、(NH4)2S2O8Deng；
Intermediate transforming agent CaCl is added for the magnesium hydroxide of high-purity in the present invention in Adlerika2, by sulphur
Sour magnesium is converted into magnesium chloride, converts sulfate radical to insoluble gypsum deposition, with the separation of reinforced Ca-Mg ion；
The magnesium sinking agent refers to NH3·H2O、NaOH、Ca(OH)2, wherein NH3·H2The regeneration of O is in (NH4)2SO4、
NH4Milk of lime Ca (OH) is added in Cl solution2And obtain ammonia and reuse, so that sulfate radical is converted into insoluble gypsum pair
Product, calcium ion and chlorion generate CaCl2Solution is recycled as intermediate transforming agent.
Compared with prior art, present invention has the advantage that：
According to the Industrial Solid Wastes such as magnesium sulfite of the present invention, carbide slag, sodium sulphate by metathesis reaction preparing magnesium hydroxide,
The technique of sodium sulfite and by-product gypsum, conversion reaction carry out under low temperature, without being carried out to magnesium sulfite
High-temperature roasting；Even if autoxidation has occurred for a part of magnesium sulfite, the conversion of the technique preparing magnesium hydroxide is not interfered with still
Rate and the rate of recovery；Entire reaction process is to close, carried out in the equipment of low pressure, and safety coefficient is high, controllability is strong, three wastes
Discharge；Large-scale production can be realized after slightly improving conventional chemical industry equipment；The high product of two kinds of market added values of output
With a kind of by-produced gypsum, gypsum can be used as building materials, and environmental sound will not cause environment air storage secondary dirt
Dye.
According to the Industrial Solid Wastes such as magnesium sulfite of the present invention, carbide slag, sodium sulphate by double decomposition convert preparing magnesium hydroxide,
It is raw material that the technique of sodium sulfite and by-product gypsum, which is using solid waste, and entire process costs are relatively low and process is simple；It illustrates
The new process that solid wastes recycling recycles.
Technique according to preparing magnesium hydroxide of the present invention, sodium sulfite and by-product gypsum is to make full use of Industrial Solid Waste
Under the conditions of carry out, low energy consumption technical process, the magnesium ion that is efficiently utilized in magnesium sulfite and inferior sulfate radical and intermediate conversion
Agent can whole regenerations, enhance the value-rising of product；At least three kinds of above Industrial Solid Wastes can be handled simultaneously, favorably
In reducing environmental pollution, realize circular economy.
The technology of the present invention feature and advantage will be illustrated partly in the following description, and beneficial effects of the present invention can pass through
Following specific examples is accomplished.
Description of the drawings
The specific descriptions of the present invention in conjunction with the following drawings become more clearly understood from it is with the obvious advantage；Wherein：
Attached drawing 1 is magnesium sulfite preparing magnesium hydroxide, sodium sulfite and by-product gypsum work according to a first embodiment of the present invention
The flow chart of skill；
Attached drawing 2 is magnesium sulfite preparing magnesium hydroxide, sodium sulfite and by-product gypsum work according to a second embodiment of the present invention
The flow chart of skill；
Attached drawing 3 is magnesium sulfite preparing magnesium hydroxide, sodium sulfite and by-product gypsum work according to a third embodiment of the present invention
The flow chart of skill；
Attached drawing 4 is magnesium sulfite preparing magnesium hydroxide, sodium sulfite and by-product gypsum work according to a fourth embodiment of the present invention
The flow chart of skill；
Attached drawing 5 is magnesium sulfite preparing magnesium hydroxide, sodium sulfite and by-product gypsum work according to a fifth embodiment of the present invention
The flow chart of skill；
Specific embodiment
Embodiment of the present invention provides in the following figures, and the embodiment described with reference to the accompanying drawings is exemplary, and is only used
It is of the invention in explaining, and be not considered as limiting the invention.
Fig. 1 gives magnesium sulfite preparing magnesium hydroxide, sodium sulfite and the flow chart of by-product gypsum technique, specific implementation
Such as shown in Fig. 1：First, magnesium sulfite is crushed, the magnesium sulfite that concentration 25% is stirred and modulated into stirred reactor is outstanding
Turbid, the sulfuric acid for being slowly added to 60% concentration are acidified, and control reaction condition makes magnesium sulfite slow mechanism dissolved release SO2It (send
Produce sodium sulfite process), 70~80 DEG C of controlling reaction temperature stops adding after being stirred to react 3.0h to magnesium sulfite all dissolving
Acid；Conversion fluid is heated to boiling and catches up with net SO2, continue to be stirred to react 1.0h；Then it is added in acidifying solution in levigate milk of lime
With to pH=6~8, and the heavy metal ion such as hydrogen peroxide oxidation removing of iron and manganese are added, filtering removal insoluble matter and calcium sulfate residue,
Alkaline magnesium sinking agent NH is added in refined magnesium sulfate clear liquid3·H2The molar ratio of O, ammonia addition and magnesium sulfate is 0.91~2.0:
1.0, continue to be stirred to react 0.5~1.0h, 2.0~2.5h is then aged at 30~50 DEG C, by magnesium hydrate precipitate filtration washing,
It is dried to obtain magnesium hydroxide products, product purity >=96.8%, yield >=93.0%；Filtrate is ammonium sulfate soluble easily in water, is added
Entering equimolar milk of lime makes ammonia be regenerated.The regenerative process of ammonia is carried out at the same time with next batch magnesium sinking process, it is
By above-mentioned ammonium sulfate in ammonia distiller, at the uniform velocity it is added and ammonium sulfate equimolar concentration 35% under 70~92 DEG C of stirring conditions
Milk of lime, ammonia still process reacts 2.0-2.5h, and the sediment of generation obtains the high gypsum by-product of purity after filtration washing；Ammonia
With in negative pressure importing ammonia alkali magnesium sinking reactor, the reaction was continued and generates magnesium hydrate precipitate and ammonium sulfate with magnesium sulfate, and ammonia is made
It is recycled for magnesium sinking agent.
It is deployed into suspension with the carbide slag of the sodium sulphate of concentration 20% and concentration 30%；Mole of sodium sulphate and lime
Than being 1: 1.1~1.2, above-mentioned magnesium sulfite is acidified the SO that dissolving is released2Conductance enters to be produced in sulfur dioxide absorbing reaction device
Sodium sulfite；SO2Absorption in closed container under agitation in carrying out, and reaction temperature is 35 DEG C, when being stirred to react
Between be 3.0~4.5h, when measuring 5.5~6.0 pH of conversion fluid, SO2Gas be switched in another grade of absorbing reaction device into
Row continuous absorption, in SO2It absorbs in the interior a small amount of sodium carbonate liquor of addition of reactor of saturation and deliming, filtration washing removes gypsum
And insoluble residue, obtain pH8.5~9.0, a concentration of 20~25% sodium sulfite solution；Then a little vulcanized sodium precipitation is added
Heavy metal ion is removed, send refined sodium sulfite solution to evaporations and concentration, sodium sulfite conversion overall recovery after filtering and impurity removing
For 95%, product purity >=96.0%.
Fig. 2 gives magnesium sulfite preparing magnesium hydroxide, sodium sulfite and the flow chart of by-product gypsum technique, specific implementation
Such as shown in Fig. 2：First, magnesium sulfite is crushed, the magnesium sulfite that concentration 20% is stirred and modulated into stirred reactor is outstanding
Turbid, the sulfuric acid for being slowly added to concentration 100% are acidified, and control reaction condition makes magnesium sulfite slow mechanism dissolved release SO2It (send
Produce sodium sulfite process), 60 DEG C of controlling reaction temperature stops acid adding after being stirred to react 2.5h to magnesium sulfite all dissolving；
Conversion fluid is heated to boiling and catches up with net SO2, continue to be stirred to react 2.0h；Then levigate milk of lime is added in acidifying solution to be neutralized to
H=6~8 p, and sodium peroxydisulfate iron removal by oxidation manganese is added, filtering removal insoluble matter and calcium sulfate residue, in refined magnesium sulfate
It is added the magnesium sinking agent NaOH of concentration 25% in the clear liquid of concentration 20%, the molar ratio of magnesium sinking agent addition and magnesium sulfate is 1.5~
2.0: 1.0, continue to be stirred to react 0.5~1.0h, 2.5~3.0h is then aged at 60~65 DEG C, magnesium hydrate precipitate is filtered
Washing, is dried to obtain magnesium hydroxide, product purity >=99.30%, yield >=97.0%, filter liquor be dissolved in water sodium sulphate it is molten
Liquid is back to after collection and produces sodium sulfite process.By quick lime be modulated into the milk of lime of concentration 40% and above-mentioned concentration 15~
20% sodium sulphate mixing preparation is at suspension；The molar ratio of sodium sulphate and quick lime is 1: 1.2, and magnesium sulfite is acidified and is dissolved
The sulfur dioxide gas of releasing imports SO2Sodium sulfite, SO are produced in absorbing reaction device2Absorption is under agitation in closed
It being carried out in container, reaction temperature is 33 DEG C, and it is 5.0~6.0h to be stirred to react the time, when measuring conversion fluid pH5.0~5.5,
SO2Gas, which is switched in another grade of absorbing reaction device, carries out continuous absorption, is absorbing SO2It is saturated the conversion of pH=5.0~5.5
It is added in liquid in a small amount of sodium carbonate liquor and deliming, tune pH8.5~9.5, filtration washing removes gypsum and insoluble residue, obtain dense
The sodium sulfite solution of degree about 20%；Then a small amount of vulcanized sodium precipitation is added and removes heavy metal ion, by polishing purification
Sodium sulfite solution filtering and impurity removing send evaporation and concentration, and it is 96.3%, product purity >=97.0% that sodium sulfite, which converts overall recovery,.
Fig. 3 gives magnesium sulfite preparing magnesium hydroxide, sodium sulfite and the flow chart of by-product gypsum technique, specific implementation
Such as shown in Fig. 3：First, magnesium sulfite is crushed, the magnesium sulfite that concentration 40% is stirred and modulated into stirred reactor is outstanding
Turbid, the sulfuric acid for being slowly added to concentration 30% are acidified, and control reaction condition makes magnesium sulfite slow mechanism dissolved release SO2It (send
Produce sodium sulfite process), 80 DEG C of controlling reaction temperature stops acid adding after being stirred to react 4.0h to magnesium sulfite all dissolving；
Acidifying solution is heated to boiling and catches up with net SO2, continue to be stirred to react 2.0h and then a small amount of milk of lime is added in acidifying solution to be neutralized to pH
=6~8, and hydrogen peroxide oxidation removing of iron and manganese is added dropwise, filtering removal insoluble matter and the calcium sulfate residue for neutralizing generation obtain magnesium sulfate
30~35% calcium chloride of concentration is added in solution in magnesium sulfate, generates magnesia and calcium sulfate precipitation, is filtered to remove gypsum deposition
Object obtains refined magnesium chloride solution；Levigate milk of lime, Ca (OH) are added in magnesium chloride2Addition and magnesium chloride rub
You continue to be stirred to react 0.5~1.5h, 1.5~2.0h are then aged at 60~65 DEG C, by hydrogen-oxygen than being 0.61~0.62: 1.0
Change magnesium precipitate filtration washing, is dried to obtain magnesium hydroxide products, yield 97.5%, product purity >=98.6%, filtrate is easy
It is dissolved in the calcium oxide of water, concentration is adjusted to 15~30% returns and is able to cycle profit for converting magnesium sulfate to magnesium chloride process
With.
By carbide slag or quick lime add water be modulated into 30% milk of lime, under 33 DEG C of stirring conditions with the sulphur of concentration 20%
Acid sodium solution is deployed into suspension；The molar ratio of sodium sulphate and milk of lime is 1: 1.2, and above-mentioned magnesium sulfite, which is acidified dissolving, releases
Sulfur dioxide gas import SO2Sodium sulfite, SO are produced in absorbing reaction device2Absorption is in closed container and stirring condition
Lower progress, reaction temperature is 35 DEG C, and it is 3.0~4.0h to be stirred to react the time, when measuring the pH6.0 of conversion fluid, SO2Gas
Body, which is switched in another grade of absorbing reaction device, carries out continuous absorption, is stopping being passed through SO2It is added in the absorbing reaction device of gas few
It measures in sodium carbonate liquor and deliming, filtration washing removes gypsum and insoluble residue, obtain the sulfurous of pH ≈ 8.5, a concentration of 20%
Acid sodium solution；Then a small amount of vulcanized sodium precipitation is added and removes heavy metal ion, the sulfurous that will be refined after filtering removal sediment
Acid sodium solution send evaporation and concentration, obtains sodium sulfite product, yield 95%, purity >=94.2%.
Fig. 4 gives magnesium sulfite preparing magnesium hydroxide, sodium sulfite and the flow chart of by-product gypsum technique, specific implementation
Such as shown in Fig. 4：First, magnesium sulfite is crushed, the sulfurous acid of concentration 30~40% is stirred and modulated into stirred reactor
Magnesium suspension, the hydrochloric acid for being slowly added to concentration 10~25% are acidified, and control reaction condition makes magnesium sulfite slow mechanism dissolved put
Go out SO2(send and produce sodium sulfite process), 80 DEG C of controlling reaction temperature are stopped after being stirred to react 4.0h to magnesium sulfite all dissolving
Only acid adding；Acidifying solution is heated to slightly boiling, SO is discharged2Gas continues to be stirred to react 2.0h；Then a small amount of lime is added in acidifying solution
Breast is neutralized to pH=6.5~8.5, and is passed through compressed air or O2Oxidation removes ferrimanganic, and filtering removal insoluble matter and neutralization generate
Calcium sulfate residue, obtain refined magnesium chloride solution；Levigate milk of lime, Ca (OH) are added in magnesium chloride2Addition with
The molar ratio of magnesium chloride be 0.61~0.62: 1.0, continue to be stirred to react 0.5~1.5h, then at 60~65 DEG C ageing 2.5~
Magnesium hydrate precipitate filtration washing is dried to obtain magnesium hydroxide products by 3.0h, and yield 97.5%, product purity >=
98.2%, filtrate is calcium chloride soluble easily in water, is used to convert magnesium sulfate to magnesium chloride work as intermediate transforming agent after concentration
Sequence.
By carbide slag or quick lime add water be modulated into 25% milk of lime, under 34 DEG C of stirring conditions with the sulphur of concentration 18%
Acid sodium solution is deployed into suspension；The molar ratio of sodium sulphate and milk of lime is 1: 1.2, and above-mentioned magnesium sulfite, which is acidified dissolving, releases
Sulfur dioxide gas import SO2Sodium sulfite, SO are produced in absorbing reaction device2Absorption be under agitation, reaction temperature 35
DEG C in being carried out in closed container, the reaction time is 3.0~4.0h, when measuring the pH≤6.0 of conversion fluid, SO2Gas
It is switched in another grade of absorbing reaction device and carries out continuous absorption, stopping being passed through SO2It is added in the absorbing reaction device of gas a small amount of
Gypsum and insoluble residue are removed, the sulfurous acid of pH ≈ 8.5, a concentration of 20% is obtained with deliming, filtration washing in sodium carbonate liquor
Sodium solution；Then a small amount of vulcanized sodium precipitation is added and removes heavy metal ion, the sulfurous acid that will be refined after filtering removal sediment
Sodium solution send evaporation and concentration, obtains sodium sulfite product, yield 94%, purity >=93.8%.
Fig. 5 gives magnesium sulfite preparing magnesium hydroxide, sodium sulfite and the flow chart of by-product gypsum technique, specific implementation
Such as shown in Fig. 5：First, magnesium sulfite is crushed, the magnesium sulfite that concentration 35% is stirred and modulated into stirred reactor is outstanding
Turbid, the sulfuric acid for being slowly added to concentration 40% are acidified, and control reaction condition makes magnesium sulfite slow mechanism dissolved release SO2It (send
Produce sodium sulfite process), 70 DEG C of controlling reaction temperature stops acid adding after being stirred to react 4.0h to magnesium sulfite all dissolving；
Acidifying solution is heated to boiling and catches up with net SO2, continue to be stirred to react 2.0h；Then levigate milk of lime is added in acidifying solution to be neutralized to
PH=7.5, and hydrogen peroxide oxidation removing of iron and manganese is added, filtering removal insoluble matter and calcium sulfate residue obtain magnesium sulfate clear liquid in sulphur
In sour magnesium solution be added 30~35% calcium chloride solution, convert magnesium sulfate to magnesium chloride, with milk of lime adjust pH=7.0~
NH is added in refined magnesium chloride solution in 8.0 filtration washing gypsum depositions3·H2O, the addition of ammonium hydroxide and mole of magnesium chloride
Than being 2.0~2.8: 1.0, continue to be stirred to react 0.5h, 2.0h is then aged at 45 DEG C, by magnesium hydrate precipitate filtration washing,
Magnesium hydroxide products, yield 89.1%, purity >=99.3% are dried to obtain, filter liquor is the ammonium chloride solution containing ammonia,
When next batch magnesium sinking, the milk of lime suspension of equimolar 30~35%, stirring are added in the ammonium chloride solution in ammonia distiller
70~90 DEG C of 2.5~3.0h of reaction are heated to, about 30% calcium chloride solution of regenerated ammonia and concentration are obtained, by regenerated ammonia
Negative pressure is used to be introduced into magnesium chloride solution as magnesium sinking agent reuse；About 30% calcium chloride of concentration, which is back to, converts magnesium sulfate to chlorination
Magnesium.
It is identical as above-described embodiment 4 to produce sodium sulfite process, therefore which is not described herein again；Sodium sulfite conversion obtained by Fig. 5
Overall recovery >=94.0%, product purity >=95.6%.
Claims (7)
1. the technique of a kind of magnesium sulfite preparing magnesium hydroxide, sodium sulfite, which is characterized in that include the following steps：
It stirs in the reactor and magnesium sulfite is modulated into suspension, strong acid is added and is acidified, controlling the addition of acid makes Asia
Magnesium sulfate dissolves and SO is at the uniform velocity discharged2Gas, until magnesium sulfite stops acid adding after all dissolving, continuing heating stirring reaction makes sulfurous
SO in sour magnesium acidifying solution2Fully volatilization；
Carbide slag is added in acidifying solution and is neutralized to pH=6~9, and oxidizing removing of iron and manganese is added and is allowed to generate precipitation, filtering
Insoluble matter and calcium sulfate residue are removed, NH is added in the magnesium sulfate or magnesium chloride solution being purified3·H2O、NaOH、Ca(OH)2
Etc. magnesium sinkings agent, generate magnesium hydrate precipitate and sulfate or villaumite soluble easily in water, recycled after magnesium sinking agent regeneration；
Suspension is made with sodium sulphate and carbide slag in another reactor；Above-mentioned magnesium sulfite is acidified to the SO being discharged when dissolving2
Conductance enters to carry out metathesis reaction in the suspension, generates sodium sulfite and gypsum deposition；When measure the pH 4.0 of conversion fluid~
Stop being passed through SO when 6.52Gas, in conversion fluid be added sodium carbonate, sodium sulfide solution, be used in and deliming and remove heavy metal from
Son, filtration washing remove gypsum and insoluble residue, obtain a concentration of 15~30% sodium sulfite solution；By refined sulfurous acid
Sodium solution send evaporation and concentration.
2. according to claim 1, it is further characterized in that：The sour preferably sulfuric acid or hydrochloric acid, the Ca (OH)2For with
Milk of lime made of carbide slag or quick lime；The intermediate transforming agent is CaCl2。
3. according to claim 1, it is further characterized in that：The preferred H of the oxidant2O2、O2、Na2O2、Na2S2O8、(NH4)2S2O8Deng.
4. according to claim 1, it is further characterized in that：As selection NH3·H2When O makees magnesium sinking agent, NH3·H2The regeneration of O is
In (NH4)2SO4、NH4Milk of lime Ca (OH) is added in Cl solution2Ammonia, gypsum or calcium chloride are generated, ammonia is made to be regenerated cycle
It utilizes, so that sulfate radical is converted into insoluble gypsum, calcium ion and chlorion and generate CaCl2Solution recycles.
5. according to claim 1, it is further characterized in that：When select NaOH make magnesium sinking agent when, generate magnesium hydrate precipitate and
NaSO4Solution, NaSO4It is recycled for producing sodium sulfite.
6. according to claim 1, it is further characterized in that：As selection Ca (OH)2When making magnesium sinking agent, first in Adlerika
Intermediate transforming agent CaCl is added2, to strengthen the removal of calcium ion, convert magnesium sulfate to magnesium chloride solution and gypsum deposition, so
Ca (OH) is added afterwards2Generate magnesium hydroxide and CaCl2Solution, CaCl2Solution recycles.
7. according to claim 1, it is further characterized in that：SO2Aspiration is that multi-stage absorption or strong is taken in closed container
It is carried out continuously under stirring condition processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710065330.2A CN108394920A (en) | 2017-02-06 | 2017-02-06 | A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710065330.2A CN108394920A (en) | 2017-02-06 | 2017-02-06 | A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108394920A true CN108394920A (en) | 2018-08-14 |
Family
ID=63093602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710065330.2A Pending CN108394920A (en) | 2017-02-06 | 2017-02-06 | A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108394920A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461034A (en) * | 2021-08-04 | 2021-10-01 | 中南大学 | Method for producing sodium sulfite from desulfurized gypsum |
| CN114853212A (en) * | 2022-05-09 | 2022-08-05 | 纪宏轩 | Zero-emission recycling treatment method for magnesium sulfate wastewater |
-
2017
- 2017-02-06 CN CN201710065330.2A patent/CN108394920A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461034A (en) * | 2021-08-04 | 2021-10-01 | 中南大学 | Method for producing sodium sulfite from desulfurized gypsum |
| CN113461034B (en) * | 2021-08-04 | 2022-07-22 | 中南大学 | Method for producing sodium sulfite from desulfurized gypsum |
| CN114853212A (en) * | 2022-05-09 | 2022-08-05 | 纪宏轩 | Zero-emission recycling treatment method for magnesium sulfate wastewater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1331744C (en) | Process for producing white carbon black and sodium sulphite by sodium sulfate method | |
| CN109290060A (en) | A kind of process for subsequent treatment and phosphate ore floatation method of phosphate ore flotation tailings | |
| CN101648725B (en) | Method for preparing industrial calcium chloride | |
| CN107089675A (en) | A kind of new method for the distilled ammonia wastewater recycling that ammonia-soda process soda ash is discharged | |
| CN101092240A (en) | New technique for preparing sodium hydroxide | |
| CN107540009A (en) | A kind of method that nano-calcium carbonate is prepared using carbide slag | |
| CN106277005B (en) | A kind of method that ice crystal, calcium carbonate and sodium sulphate are reclaimed in the resource from calcium fluoride sludge | |
| CN102284238A (en) | Bialkali-method flue-gas desulphurization process | |
| CN101503203B (en) | Method for decomposing ammonia sulfate and method for reclaiming sulfuric acid from waste acid and acid wastewater | |
| US3331732A (en) | Method of removing hydrogen sulfide from an aqueous solution of alkali sulfide | |
| CN108394920A (en) | A kind of technique of magnesium sulfite preparing magnesium hydroxide, sodium sulfite | |
| US3935100A (en) | Process for the treatment of waste waters containing sulfuric acid and/or ammonium sulfate | |
| CN103566750A (en) | Flue gas desulfurization method | |
| CN101760638B (en) | Method for recovering magnesium from magnesium sulfate solution | |
| CN112520761A (en) | System and method for high-efficiency recycling of flue gas desulfurization by magnesium method | |
| CN102452674B (en) | Processing method for recycling sodium sulfate from waste alkali liquor in ethylene unit | |
| CN109734106B (en) | Method for preparing high-concentration sodium bisulfite solution by using industrial waste | |
| US3619350A (en) | Chlorine dioxide pulp bleaching system | |
| CN102795701A (en) | Method for treating acidic waste water from titanium dioxide preparation by sulfuric acid method | |
| CN206502610U (en) | A kind of system of use desulfurated plaster coproduction nano-calcium carbonate, ammonium sulfate and sodium chloride | |
| KR20230167593A (en) | Method for manufacturing sodium bicarbonate and gypsum using sodium sulfate | |
| CN101069807A (en) | Method for purifying vanadium-contained stone coal sodium calcinating smoke | |
| CN102275967A (en) | Method for preparing nanometer calcium carbonate by using sintered desulfurated ash residues as raw materials | |
| CN108439441A (en) | A kind of method of normal pressure short route production magnesium hydroxide | |
| CN215975000U (en) | System for lime desulfurization obtains high-quality chemical grade gypsum |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180814 |