CN104418573A - Method for comprehensive utilization of industrial waste boron sludge - Google Patents
Method for comprehensive utilization of industrial waste boron sludge Download PDFInfo
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- CN104418573A CN104418573A CN201310375375.1A CN201310375375A CN104418573A CN 104418573 A CN104418573 A CN 104418573A CN 201310375375 A CN201310375375 A CN 201310375375A CN 104418573 A CN104418573 A CN 104418573A
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- boron mud
- magnesium
- water
- steam
- boron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to an effective utilization method of waste boron sludge in boron industry, and particularly relates to a method for comprehensive utilization of industrial waste boron sludge to produce various products. The method comprises: converting and carbonizing boron sludge to obtain a mixture, filtering the mixture by a magnetic separator to obtain iron powder, pyrolyzing the filtered liquid to obtain light magnesium carbonate, and performing pouring with materials and autoclaved curing of the filtered residues to prepare steam-cured bricks. The method is low in energy consumption and high in magnesium yield; in addition, after extraction of magnesium compounds and iron powder, the waste residues can be converted into steam-cured bricks completely, thereby realizing highly unification of ecological benefit, environment benefit, economic benefit, and social benefit. Basic magnesium carbonate contained in boron sludge is high in content and instable; when building and decoration materials prepared from the oron sludge are used, basic magnesium carbonate releases crystal water and carbon dioxide slowly; thus the materials are liable to generate deformation, cracks, and the like; physical and chemical indexes of the materials themselves decrease; safety hidden troubles are caused; and therefore, boron sludge cannot be used for directly preparing steam-cured bricks.
Description
Technical field
The present invention relates to a kind of effective Application way of boron industry waste residue boron mud, is a kind of method fully utilizing trade waste boron mud production multiple product specifically.
Background technology
China utilizes " carbon alkaline process " to produce borax (Na
2b
4o
7) history of existing over half a century, its production process is: with boron magnesium ore deposit for raw material, after roasting, add sodium carbonate (Na
2cO
3), pass into carbon dioxide, obtained borax, its reaction equation is simultaneously:
2（2MgO·B
2O
3）+Na
2CO
3+CO
2=Na
2B
4O
7+4MgCO
3
Effective constituent in boron magnesium ore deposit is boron trioxide (B
2o
3), its content only accounts for about 10% of boron magnesium ore deposit, so create a large amount of trade wastes-boron mud every year.Due to boron mud fine size (120-180 order), alkalescence strong (containing sodium carbonate 0.3-0.7 % by weight, pH value is at about 8-9), not even a blade of grass grows to make boron dust put place, not only a large amount of landed property, but also cause serious environmental pollution.
The main component of table 1 boron mud is (weight percent):
As can be seen from the above table, in boron mud, the content of magnesium is higher, and in the art, be present in the magnesium of the form of ownership in boron mud with the content unified representation of " magnesium oxide ", it comprises active carbonic acid magnesium, dead roasting magnesium oxide and Magnesium Silicate q-agent etc.Wherein, the content of dead roasting magnesium oxide and Magnesium Silicate q-agent accounts for about 8% of Mg content in boron mud.
At present, the magnesium in boron mud, iron mainly extract, for again utilizing by the method for process boron mud.Because dead roasting magnesium oxide and Magnesium Silicate q-agent are very stable, current method can not be extracted, and is merely able to extract active carbonic acid magnesium.
The existing patent utilizing boron mud to produce Magnesium Carbonate Light 41-45 (light magnesium oxide) is mainly as follows:
1) patent of the people such as Gao Jialing: 93115808.7 1 kinds of methods extracting Magnesium Carbonate Light 41-45 from boron mud;
2) patent of the people such as Gao Jialing: 200610137676.0 utilize dolomite ash and boron mud manufacture method of magnesium oxide;
3) patent of Li Zhitao: 97120985.5 utilize boric sludge to get the method for Magnesium Carbonate Light 41-45;
4) patent of Wang Wanglan, the haunt and plague woods of Bao: 01118916.0 utilizes boron mud to produce the method for magnesia series product;
5) patent of Cui Xianghao, Zhao Yuan: 200810050319.X is produced the method for magnesium basic carbonate by boron mud;
Wherein, above-mentioned patent 3), 4), 5) be all first at the temperature of 650-900 DEG C, roasting is carried out to boron mud, make magnesiumcarbonate contained in boron mud be converted into magnesium oxide, then carry out next step.
Magnesiumcarbonate contained in boron mud is in borax production process, is reacted generate by the magnesium oxide in boron magnesium ore deposit and carbonic acid gas (after passing into carbonic acid gas):
2（2MgO·B
2O
3）+Na
2CO
3+CO
2=Na
2B
4O
7+4MgCO
3
In addition, patent 4), 5) be directly the boron mud after roasting is added water to carry out carbonization (patent 4 does not add whatever when carbonization, and patent 5 adds " pyroligneous liquor " when carbonization), then by sedimentation and filtration, clear liquid carries out pyrolysis, obtains Magnesium Carbonate Light 41-45;
Patent 3) be add water after roasting, at 90-95 DEG C of digestion 10-60 minute, after its cooling, carry out carbonization again.
Above-mentioned patent 3), 4), 5) shortcoming be: in boron mud containing have an appointment about 20 % by weight moisture, need the energy of at substantial when roasting, make it to become high energy consumption industry, do not meet the viewpoint of " low-loss and energy-saving "; Secondly, patent 4), 5) through digestion operation, directly the boron mud after roasting is carried out carbonization, carbonization process is carried out quite slow, and the concentration of reaction product Magnesium hydrogen carbonate is very low, the output of the corresponding Magnesium Carbonate Light 41-45 finally obtained is very low, and a large amount of magnesium contained in boron mud is not extracted.
For patent 1), 2), applicant thinks: boron mud, calcium oxide, dolomite ash (dolomite ash main component is calcium oxide and magnesium oxide) and water, transform when 90-95 DEG C, then add catalyzer magnesium chloride (calcium chloride), following reaction is carried out:
Ca(OH)
2+Mg
2+=Mg(OH)
2+Ca
2+……①
Ca
2++MgCO
3=CaCO
3+Mg
2+……②
Total reaction is:
Ca(OH)
2+MgCO
3=CaCO
3+Mg(OH)
2……③
That is: these 2 patents are all thought: digestion operation in, only catalyzer magnesium chloride (calcium chloride) exist and heating condition under, 3. total reaction can be carried out, thus makes the magnesiumcarbonate in boron mud just can be converted into Mg (OH)
2.
And then the mixed solution digested is proceeded to carbonization tank, under the condition passing into carbon dioxide, carry out carbonization, make the Mg (OH) produced in digestion operation
2change into Mg (HCO
3)
2, obtain Magnesium Carbonate Light 41-45 through pyrolysis.
In addition, these patents above-mentioned are not all mentioned: the problem how waste residue remaining after extracting magnesium compound processes.So, the stacking place of these waste residues and the problem of contaminate environment are not still solved.
Therefore, adopt which type of effective ways a kind of, the pollution problem of boron mud to environment can be solved, a large amount of magnesium contained in boron mud can be put forward again, whether other composition can be produced new product as new resource and do not carried out contaminate environment as waste and just become one of local government and borax industry urgent need to solve the problem simultaneously simultaneously.
Summary of the invention
The present inventor finds after large quantifier elimination, do not add catalyzer at digestion phase and carbonation stage or do not add catalyzer at digestion phase, and by change digestion phase and or the processing condition of carbonation stage, from boron mud, the magnesium compound of high-quality can be obtained with high yield.The invention provides a kind of method fully utilizing trade waste boron mud, the method comprises conversion, carbonization and extraction iron powder successively, can obtain iron powder, magnesium compound and steam brick simultaneously.
The object of the invention is to provide a kind of method fully utilizing trade waste boron mud, boron mud is obtained mixture through conversion, carbonizing treatment, mixture filters to obtain iron powder through magnetic separator, the filtrate of filtering obtains Magnesium Carbonate Light 41-45 through pyrolysis, and the filter residue of filtration prepares steam brick through batching cast and steam press maintenance.
In described step of converting, boron mud is in magnesium oxide, and be that 1:0.5-1.5:6-10 mixes with weight ratio by boron mud, calcium oxide and water, invert point is 85-95 DEG C, and transformation time is 2-3.5 hour.
In described step of converting, boron mud is in magnesium oxide, and be that 1:0.8:7 mixes with weight ratio by boron mud, calcium oxide and water, invert point is 90 DEG C, and transformation time is 2.5 hours.
The condition of described carburising step comprises the water that the 20-40 temperature doubly adding described calcium oxide weight in the mixture being terminated rear acquisition by described step of converting is 0-30 DEG C, and continues the carbonic acid gas passing into 0.2-0.5MPa, carbonization 1-2 hour.
The process adding water in carburising step can add the acid of the 1.5-2.5% of described calcium oxide weight simultaneously.
The filtrate of described filtration is magnesium bicarbonate solution, and the superheated vapour passing into 100-120 DEG C wherein carries out pyrolysis, obtains Magnesium Carbonate Light 41-45 through press filtration, oven dry, pulverizing, afterwards at 600-1000 DEG C of calcining 10-20 minute, obtains light magnesium oxide.
Described filter residue is through batching cast, in filter residue, add cement, gypsum, He Shui, aluminium powder, toughener mix in grinding tool, leave standstill 20-40 minute, take out cutting, wherein: (1) by weight: filter residue: cement: gypsum: water=1:0.2-0.3:0.1-0.2:0.5-0.8, (2) rubbing is specifically long-pending adds aluminium powder 400-600g/m
3, toughener 300-500g/m
3.
Described steam press maintenance be by cutting after work in-process steam pressure 7-8 hour under 0.7-0.8MP condition.
Advantage of the present invention:
A kind of method fully utilizing trade waste boron mud provided by the invention, the method energy consumption is low, magnesium yield is high; Further, the waste residue extracted after magnesium compound, iron powder can be converted into steam brick completely, thus achieve the high unity of ecological benefits, environmental benefit, economic benefit, social benefit.Basic carbonate Mg content then due to contained in boron mud is high and unstable, the building prepared, finishing material are in use, magnesium basic carbonate will discharge crystal water and carbonic acid gas lentamente, material is made to occur distortion, crackle etc., the physical and chemical index of material itself is declined, cause potential safety hazard, so can not directly utilize boron mud to prepare steam brick.
Accompanying drawing explanation
Fig. 1 is the schema of a preferred implementation of boron mud waste integrated conduct method provided by the invention.
Embodiment
The invention provides a kind of method fully utilizing trade waste boron mud, the method comprises step of converting and carburising step successively, it is characterized in that, in described step of converting, boron mud is in magnesium oxide, be that 1:0.5-1.5:6-10 mixes with weight ratio by boron mud, calcium oxide and water, invert point is 85-95 DEG C, and transformation time is 2-3.5 hour.Transforming under condition of the present invention after water, boron mud and calcium oxide are stirred, calcium oxide can be made fully to change into calcium hydroxide, meanwhile, also making in boron mud the activated magnesia of remnants when producing borax change into magnesium hydroxide.The reaction that this stage occurs is:
CaO+H
2O=Ca(OH)
2↓
MgO+H
2O=Mg(OH)
2↓
In a preferred embodiment, the weight ratio of described boron mud, described calcium oxide and described water is 1:0.2-0.4:8-10 mixing, and invert point is 90-95 DEG C, and transformation time is 2-2.5 hour.The conversion reaction carried out under this condition, can not only improve changing effect further, and can also reduce energy consumption further.
In post-conversion, carbonization can be carried out under the condition of existing carbonization.Mixed solution after transforming is pumped into carbonization tank, passes into carbon dioxide and carry out carbonization.The reaction that this stage occurs is:
Ca(OH)
2+CO
2=CaCO
3↓+H
2O ……⑴
CaCO
3+CO
2+H
2O=Ca(HCO
3)
2……⑵
Ca(HCO
3)
2+MgCO
3=Mg(HCO
3)
2+CaCO
3↓ ……⑶
Mg(OH)
2+CO
2=MgCO
3↓+H
2O ……⑷
MgCO
3+CO
2+H
2O=Mg(HCO
3)
2……⑸
Total reaction equation is:
MgCO
3+Ca(OH)
2+3CO
2+H
2O=Mg(HCO
3)
2+Ca(HCO
3)
2……⑹
Ca(HCO
3)
2+MgCO
3=CaCO
3↓+Mg(HCO
3)
2……⑺
CaCO
3+CO
2+H
2O=Ca(HCO
3)
2……⑴
Ca(HCO
3)
2+MgCO
3=Mg(HCO
3)
2+CaCO
3↓ ……⑵
So move in circles, make the active carbonic acid magnesium total overall reaction in boron mud complete, generate Magnesium hydrogen carbonate.
Question response carries out the (CO passing into and overflow in timing detection carbonization tank completely
2concentration, to determine whether reaction is carried out completely), the mixed solution in carbonization tank is filtered through magnetic separator.Filtrate is Magnesium hydrogen carbonate (Mg (HCO
3)
2) solution (that is: heavy magnesium water), what magnetic separator reclaimed is iron powder, and filter residue is then used for preparing steam brick.
The magnesium bicarbonate solution (heavy magnesium water) obtained after carbon filter is carried out pyrolysis, obtains Magnesium Carbonate Light 41-45.
In a preferred embodiment, in described carburising step, add the acid of the 2-2.5% of described calcium oxide weight.Described acid can be selected from one or more in hydrochloric acid, acetic acid, nitric acid.Under this condition, reasonable carbonization effect can also be obtained.
In a preferred embodiment, the condition of described carburising step comprises the water that the 25-35 temperature doubly adding described calcium oxide weight in the mixture being terminated rear acquisition by described step of converting is 0-25 DEG C, and continue the carbon dioxide passing into 0.4-0.5MPa, carbonization 1-2 hour.In a preferred embodiment, the condition of described carburising step comprises the water that the 25-35 temperature doubly adding described calcium oxide weight in the mixture being terminated rear acquisition by described step of converting is 20-30 DEG C.The water adding this temperature can be lowered the temperature to the mixed solution after conversion, thus enables the temperature of carbonization maintain 30 DEG C, preferably less than 25 DEG C.Described carbon dioxide can from limestone kiln kiln gas, and such as, by the kiln gas of calcined limestone, namely carbon dioxide is collected, and after the corrosive gasess such as washing removal sulfurous gas wherein, is forced into required pressure with air compressor.
Described calcium oxide carrys out one or more products obtained in consisting of quicklime and calcined dolomite, calcite, marble.The main component of rhombspar is calcium carbonate and magnesiumcarbonate, obtains magnesium oxide and calcium oxide after calcining, and the main component of marble, calcite is calcium carbonate, after calcining, all can obtain calcium oxide, i.e. unslaked lime.
According to required obtained magnesium compound, the method also comprises a step in thermolysis, separation, drying and calcination steps or a few step after carburising step, to obtain such as Magnesium Carbonate Light 41-45 or light magnesium oxide.
In order to thoroughly solve the pollution problem of boron mud, the method for comprehensive utilization provided by the invention also comprises and is used for preparing steam brick by leaching the filter residue after heavy magnesium water.
Described filter residue, cement, gypsum, water, aluminium powder and toughener are through batching cast, and quiet stopping is cut, and steam press maintenance prepares steam brick.Wherein, the weight ratio of described filter residue, described cement, described gypsum, described water is 1(filter residue): 0.2-0.3(cement): 0.1(gypsum): 0.6(water), described aluminium powder 500g/m
3, toughener 400g/m
3, to improve the over-all properties of steam brick.
1, lightweight
The dry volume density of steam brick is generally 400 ~ 700kg/m
3be equivalent to 1/3 of clay brick, 1/5 of normal concrete, also lower than general lightweight aggregate concrete and the goods such as holllow building block, structural clay tile, thus, adopt steam brick to make materials for wall and greatly can alleviate buildings deadweight, and then the basis of buildings and the size of the structural part such as beam, post can be reduced, save material of construction and engineering cost, also can improve the shock resistance of buildings.
2, good heat insulating
Steam brick inside has pore small in a large number, and thus have good thermal and insulating performance, the thermal conductivity of steam brick is generally 0.09 ~ 0.22W/(mk), be only 1/4 ~ 1/5 of clay brick, the 1/5-1/10 of normal concrete.The heat insulating effect of the steam brick that usual 20cm is thick, is equivalent to the unselected clay brick wall that 49 ㎝ are thick, not only can save heating and the refrigeration energy, and greatly can improve the plane productivity of buildings.
The thermal conductivity (W/mk) of table 2 common building material
3, there is workability
Steam brick, without coarse aggregate, has good workability, can saw, digs, bores, follow closely, and available suitable matrix material bonding, provide favourable condition to building operation.
Embodiment 1:
1) in conversion tank, 2000 kg of water, 1000 kilograms of boron mud (content of magnesia is 30%) and 200 kilograms of calcium oxide are stirred, transform 150 minutes at 95 DEG C, obtain transformation mixture.
2) above-mentioned transformation mixture is pumped in carbonization tank, in carbonization tank, add the water of 8 tons 25 DEG C, cool simultaneously, carbonization temperature is remained on 25 DEG C (the highest can not more than 30 DEG C), passes into the carbon dioxide that pressure is 0.4MPa, carbonization 1.5 hours.
3) mixed solution after carbonization is selected after iron powder 75 kilograms through magnetic separator, then pass through Jilin
The plate-and-frame filter press of filtration machinery company limited of Hengchang BAZ1200-200J filters, and obtains magnesium bicarbonate solution and filter residue after filtration.The superheated vapour passing into 100-120 DEG C at magnesium bicarbonate solution carries out pyrolysis, then filters acquisition Magnesium Carbonate Light 41-45 filter cake through plate-and-frame filter press, then dries 1.5 hours acquisition Magnesium Carbonate Light 41-45s through the reciprocal chain of laminar; 800 DEG C of calcinings (15 minutes) more afterwards, obtain the light magnesium oxide of 235 kilograms.The yield of light magnesium oxide is 78%, is detected by complexometric titration method, and the quality of product meets " premium grads " standard of regulation in national standard (HG/T2573-2012).
4) mixed solution after carbonization is chosen after iron powder through magnetic separator, what add cement, gypsum and water in the filter residue that filtration obtains by weight is 1(filter residue): 0.2(cement): 0.1(gypsum): 0.6(water), rubbing is specifically long-pending adds aluminium powder 500g/m again
3, toughener 400g/m
3, pour into a mould after batching mixing, leave standstill and cut into required size after 20 minutes, steam press maintenance pressurizes and prepares steam brick (24m in 7 hours under 0.8MP condition
3).Detect through building products quality surveillance inspection center of Dandong City, quality product meets the requirement of national standard (GB11968-2006).
Embodiment 2:
1) in conversion tank, 3000 kg of water, 1000 kilograms of boron mud (content of magnesia is 30%) and 400 kilograms of calcium oxide are stirred, transform 210 minutes at 85 DEG C, obtain transformation mixture.
2) above-mentioned transformation mixture is pumped in carbonization tank, in carbonization tank, add the water of 8 tons 15 DEG C, cool simultaneously, make carbonization temperature remain on 25 DEG C, pass into the carbon dioxide of 0.2MPa, carbonization 2 hours.
3) mixed solution after carbonization is filtered, obtain magnesium bicarbonate solution.The superheated vapour passing into 100-120 DEG C at magnesium bicarbonate solution carries out pyrolysis, acquisition Magnesium Carbonate Light 41-45 precipitates, through filtration, washing, dry (120 DEG C-200 DEG C regulate according to degree of drying), afterwards 800 DEG C of calcinings 15 minutes, obtain the light magnesium oxide of 213 kilograms.The yield of light magnesium oxide is 71%, is detected by complexometric titration method, and the quality of product meets " premium grads " standard of regulation in national standard (HG/T2573-2012).
4) choose after iron powder by the mixed solution after carbonization through magnetic separator, the weight ratio of filtering filter residue, cement, gypsum, aluminium powder and the water obtained is 1(filter residue): 0.3(cement): 0.1(gypsum): 0.6(water), aluminium powder 500g/m
3, toughener 400g/m
3, through batching cast, quiet stopping is cut, and steam press maintenance prepares steam brick.Detect through building products quality surveillance inspection center of Dandong City, quality product meets the requirement of national standard (GB11968-2006).
Embodiment 3:
1) in conversion tank, 2400 kg of water, 1000 kilograms of boron mud (content of magnesia is 30%) and 300 kilograms of calcium oxide are stirred, transform 180 minutes at 90 DEG C, obtain transformation mixture.
2) above-mentioned transformation mixture is pumped in carbonization tank, in carbonization tank, add the water of 9 tons 20 DEG C, cool simultaneously, make carbonization temperature remain on less than 30 DEG C.Add the concentrated hydrochloric acid of 9 kilograms, pass into the carbon dioxide of 0.3MPa, carbonization 1.5 hours.
3) mixed solution after carbonization is filtered, obtain magnesium bicarbonate solution.The superheated vapour passing into 100-120 DEG C at magnesium bicarbonate solution carries out pyrolysis, obtains Magnesium Carbonate Light 41-45 precipitation, through filtration, washing, drying, afterwards 800 DEG C of calcinings 15 minutes, obtains the light magnesium oxide of 210 kilograms.The yield of light magnesium oxide is 70%, is detected by complexometric titration method, and the quality of product meets " premium grads " standard of regulation in national standard (HG/T2573-2012).
4) choose after iron powder by the mixed solution after carbonization through magnetic separator, the weight ratio of filtering filter residue, cement, gypsum, aluminium powder and the water obtained is 1(filter residue): 0.2(cement): 0.1(gypsum): 0.6(water), aluminium powder 500g/m
3, toughener 400g/m
3, through batching cast, quiet stopping is cut, and steam press maintenance prepares steam brick.Detect through building products quality surveillance inspection center of Dandong City, quality product meets the requirement of national standard (GB11968-2006).
Embodiment 4:
1) in conversion tank, 2000 kg of water, 1000 kilograms of boron mud (content of magnesia is 30 % by weight) and 250 kilograms of calcium oxide are stirred, transform 150 minutes at 95 DEG C, obtain transformation mixture.
2) above-mentioned transformation mixture is pumped in carbonization tank, in carbonization tank, add the water of 7 tons 25 DEG C, cool simultaneously, make carbonization temperature remain on about 30 DEG C.Add the concentrated hydrochloric acid of 3.75 kilograms, pass into the carbon dioxide of 0.5MPa, carbonization 1 hour.
3) mixed solution after carbonization is filtered, obtain magnesium bicarbonate solution.The superheated vapour passing into 100-120 DEG C at magnesium bicarbonate solution carries out pyrolysis, obtains Magnesium Carbonate Light 41-45 precipitation, through filtration, washing, drying, afterwards 800 DEG C of calcinings 15 minutes, obtains the light magnesium oxide of 220 kilograms.The yield of light magnesium oxide is 73%, is detected by complexometric titration method, and the quality of product meets national standard (HG/T2573-2012)
4) choose after iron powder by the mixed solution after carbonization through magnetic separator, the weight ratio of filtering filter residue, cement, gypsum, aluminium powder and the water obtained is 1(filter residue): 0.3(cement): 0.1(gypsum): 0.5(water), aluminium powder 500g/m
3, toughener 400g/m
3, through batching cast, quiet stopping is cut, and steam press maintenance prepares steam brick.Detect through building products quality surveillance inspection center of Dandong City, quality product meets the requirement of national standard (GB11968-2006).
Embodiment 5
Step 1) to 3) identical with embodiment 4, carry out in such a way unlike step 4):
4) choose after iron powder by the mixed solution after carbonization through magnetic separator, the weight ratio of filtering filter residue, cement, gypsum, aluminium powder and the water obtained is 1(filter residue): 0.2(cement): 0.2(gypsum): 0.7(water), aluminium powder 500g/m
3, toughener 400g/m
3, through batching cast, quiet stopping is cut, and steam press maintenance prepares steam brick.Detect through building products quality surveillance inspection center of Dandong City, quality product meets the requirement of national standard (GB11968-2006).
Comparative example 1 is
1) in conversion tank by 5000 kg of water, 1000 kilograms of boron mud (content of magnesia is 30%), 1.5 kilograms of magnesium chlorides and 150 kilograms of calcium oxide stir, 90 DEG C transform 90 minutes, obtain transformation mixture.
2) above-mentioned transformation mixture is pumped in carbonization tank, cool simultaneously, make carbonization temperature remain on about 25 DEG C, pass into the carbon dioxide of 0.4MPa, carbonization 90 minutes.
3) mixed solution after carbonization is filtered, obtain magnesium bicarbonate solution.The superheated vapour passing into 100-120 DEG C at magnesium bicarbonate solution carries out pyrolysis, obtains Magnesium Carbonate Light 41-45 precipitation, through filtration, washing, drying, afterwards 800 DEG C of calcinings, obtains the light magnesium oxide of 166 kilograms.The yield of light magnesium oxide is 55%, is detected by complexometric titration method, and the quality of product meets " premium grads " standard of regulation in national standard (HG/T2573-2012).
Claims (8)
1. one kind fully utilizes the method for trade waste boron mud, it is characterized in that: boron mud is obtained mixture through conversion, carbonizing treatment, mixture filters to obtain iron powder through magnetic separator, and the filtrate of filtration obtains Magnesium Carbonate Light 41-45 through pyrolysis, and the filter residue of filtration prepares steam brick through batching cast and steam press maintenance.
2. by the method fully utilizing trade waste boron mud described in claim 1, it is characterized in that: in described step of converting, boron mud, calcium oxide and water, in magnesium oxide, are that 1:0.5-1.5:6-10 mixes with weight ratio by boron mud, invert point is 85-95 DEG C, and transformation time is 2-3.5 hour.
3. by the method fully utilizing trade waste boron mud described in claim 1, it is characterized in that: in described step of converting, boron mud, calcium oxide and water, in magnesium oxide, are that 1:0.8:7 mixes with weight ratio by boron mud, invert point is 90 DEG C, and transformation time is 2.5 hours.
4. by the method fully utilizing trade waste boron mud described in claim 1, it is characterized in that: the condition of described carburising step comprises the water that the 20-40 temperature doubly adding described calcium oxide weight in the mixture being terminated rear acquisition by described step of converting is 0-30 DEG C, and continue the carbonic acid gas passing into 0.2-0.5MPa, carbonization 1-2 hour.
5. by the method fully utilizing trade waste boron mud described in claim 4, it is characterized in that: the process adding water in carburising step adds the acid of the 1.5-2.5% of described calcium oxide weight simultaneously.
6., by the method fully utilizing trade waste boron mud described in claim 1, it is characterized in that:
The filtrate of described filtration is magnesium bicarbonate solution, and the superheated vapour passing into 100-120 DEG C wherein carries out pyrolysis, obtains Magnesium Carbonate Light 41-45 through press filtration, oven dry, pulverizing, afterwards at 600-1000 DEG C of calcining 10-20 minute, obtains light magnesium oxide.
7. by the method fully utilizing trade waste boron mud described in claim 1, it is characterized in that: described filter residue is through batching cast, in filter residue, add cement, gypsum, He Shui, aluminium powder, toughener mix in grinding tool, leave standstill 20-40 minute, take out cutting, wherein: (1) by weight: filter residue: cement: gypsum: water=1:0.2-0.3:0.1-0.2:0.5-0.8, (2) rubbing is specifically long-pending adds aluminium powder 400-600g/m
3, toughener 300-500g/m
3.
8., by the method fully utilizing trade waste boron mud described in claim 1, it is characterized in that: described steam press maintenance be by cutting after work in-process steam pressure 7-8 hour under 0.7-0.8MP condition.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109250735A (en) * | 2017-07-13 | 2019-01-22 | 田利 | A method of recycling trade waste boron mud |
| CN109279833A (en) * | 2018-08-28 | 2019-01-29 | 武汉金发科技有限公司 | A kind of boron mud carbonized residue/foamed polystyrene insulation board and a kind of preparation method of foaming insulation board |
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| CN109279833A (en) * | 2018-08-28 | 2019-01-29 | 武汉金发科技有限公司 | A kind of boron mud carbonized residue/foamed polystyrene insulation board and a kind of preparation method of foaming insulation board |
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