CN104355328A - Light magnesium carbonate prepared by carbonizing boric sludge, production method and application of light magnesium carbonate - Google Patents
Light magnesium carbonate prepared by carbonizing boric sludge, production method and application of light magnesium carbonate Download PDFInfo
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- CN104355328A CN104355328A CN201410562488.7A CN201410562488A CN104355328A CN 104355328 A CN104355328 A CN 104355328A CN 201410562488 A CN201410562488 A CN 201410562488A CN 104355328 A CN104355328 A CN 104355328A
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Abstract
The invention provides a method for preparing light magnesium carbonate by a boric sludge carbonizing method. The method comprises the following steps: (1) digestion reaction, to be specifc, mixing boric sludge, calcium oxide and water, adding a catalyst high-magnesium-content water, and performing reaction to prepare boric marl emulsion; (2) carbonization reaction, to be specific, supplementing water and introducing carbon dioxide into the prepared boric marl emulsion for carbonization reaction, and performing filtration to obtain high-magnesium-content water and calcium carbonate precipitates; (3) pyrolytic reaction, to be specific, performing pyrolytic reaction on the filtered high-magnesium-content water to prepare the light magnesium carbonate. According to the method, the catalyst light magnesium carbonate is added in a digestion stage, so that the conversion rate of magnesium in the boric sludge in the digestion stage is increased, and the digestion time is shortened; the introduction of impurity ions cannot be brought into a final product by the addition of the catalyst high-magnesium-content water, so that the purity of the product is improved, the concentration of the high-magnesium-content water obtained after carbonization is increased, the pyrolysis energy consumption is reduced, and the production cost of the product is lowered.
Description
Technical field
The present invention relates to metal material field, particularly relate to the method for a kind of boron peat legal system for Magnesium Carbonate Light 41-45.
Background technology
Magnesium Carbonate Light 41-45 is a kind of important inorganic chemical product, is widely used in the fields such as rubber, plastics, food-processing, health care, insulating material, glass.Magnesium Carbonate Light 41-45 relative density is little, light weight and loose, can be used as weighting agent and the strengthening agent of rubber item, thus improves the quality of rubber item.Magnesium Carbonate Light 41-45 has and does not burn, and discharges carbonic acid gas and water after pyrolytic decomposition, can be used as adiabatic, resistant to elevated temperatures fire-retardant heat-insulation material in construction industry.Food grade Magnesium Carbonate Light 41-45 can be used as additive, magnesium elements supplement.Magnesium Carbonate Light 41-45 also can be used for manufacturing household chemicals and the pharmaceutical products etc. such as high glass goods, magnesium salts, pigment, paint, frie retardant coating, printing-ink, pottery, makeup, toothpaste.
Boron peat legal system is utilized for the main technique of Magnesium Carbonate Light 41-45 to be: boron mud and a certain amount of unslaked lime are carried out phase transfer reaction, make the inertia magnesiumcarbonate of not easily carbonization in boron mud be converted into the magnesium hydroxide being easy to carbonization, after reaction again through carbonization, filtration, pyrolysis, refilter, the obtained Magnesium Carbonate Light 41-45 such as dry.
Patent CN102424408A discloses a kind of method fully utilizing boron mud, the main technique of the method; By boron mud and a certain amount of calcium oxide and water hybrid reaction, wherein inertia magnesiumcarbonate is made to be converted into magnesium hydroxide, postdigestive slurries carry out carburizing reagent again through cooling, dilution etc., carbonization rear slurry after filtration, pyrolysis, refilter, the obtained the finished product Magnesium Carbonate Light 41-45 such as dry.
Patent CN1944259A discloses one and utilizes dolomite ash and boron mud manufacture method of magnesium oxide, the main technique of the method: dolomite ash after digestion (major ingredient is calcium hydroxide and magnesium hydroxide) and boron mud under having soluble calcium salt or soluble magnesium salt catalyst to exist, magnesiumcarbonate generation causticizing reaction in dolomite ash Ruzhong calcium hydroxide and boron mud, then obtain the finished product Magnesium Carbonate Light 41-45 or industrial magnesium oxide through operations such as carbonization, filtration, pyrolysis, press filtration, drying, calcinings.
Patent CN1100384A discloses a kind of method extracting Magnesium Carbonate Light 41-45 from boron mud, the method comprises carburizing reagent, thermolysis, separation and Extraction process, before carburizing reagent, under the existence of catalyst soluble magnesium salts or soluble calcium salt, first make the active carbonic acid magnesium in boron mud and Ca (OH)
2reaction generates Mg (OH)
2.
Patent CN103979584A discloses a kind of boric sludge for Magnesium Carbonate Light 41-45 technique, and this technique mainly comprises (1) digestion: boron mud, calcium oxide and water mixed and react, obtained digestion slurries.(2) carbonization: supplement gauge water to digestion by liquid, adjustment concentration of slurry, and continue to pass into carbonic acid gas stirring reaction.(3) pyrolysis: filtered by described carbonization solution, obtains filtrate and slag body, and described filtrate adds alkali and carries out pyrolysis.(4) purifying: the mixed solution after pyrolysis is carried out filtering, wash, dry and obtain product Magnesium Carbonate Light 41-45.
But mainly there is following problem in prior art:
(1) solubility magnesium salts or calcium salt is added in digestion reaction, as magnesium chloride, magnesium nitrate, calcium chloride, nitrocalcite etc.Adding of catalyzer can shorten digestion reaction time and the extraction yield improving magnesium in boron mud, but can introduce new impurity to system simultaneously, causes the finished product purity to be affected.Magnesium chloride or adding of magnesium nitrate introduce chlorion or nitrate ion to system, and calcium chloride or adding of nitrocalcite not only introduce chlorion and nitrate ion to this system, make system calcium ion increase simultaneously, product purity all can be made influenced.
(2) any catalyzer is not added in digestion reaction, boron mud, unslaked lime, water directly carry out digestion reaction at 100 DEG C, unslaked lime changes into calcium hydroxide, magnesiumcarbonate is converted into magnesium hydroxide by calcium hydroxide further, this technique digestion time is longer, the extraction yield of magnesium is low, and product cost rises, and is unfavorable for suitability for industrialized production.
Summary of the invention
For exist in above-mentioned prior art add solubility magnesium salts or new foreign ion introduced by calcium salt, affect product purity, when not adding catalyzer, digestion time is long, the extraction yield of magnesium is low, the problems such as product cost is high, the invention provides the method for a kind of boron peat legal system for Magnesium Carbonate Light 41-45, present method is to the optimization of traditional boron peat legal system for the technique of Magnesium Carbonate Light 41-45, the method adds catalyzer heavy magnesium water at digestion phase, improve the transformation efficiency of magnesium in digestion phase boron mud, shorten digestion time, also foreign ion can not be introduced to the finished product, reduce calcium contents in solution simultaneously, improve product purity.
In order to achieve the above object, present invention employs following technical scheme:
Boron peat legal system is for a method for Magnesium Carbonate Light 41-45, and the method comprises the following steps:
(1) digestion reaction: after boron mud, calcium oxide and water are mixed, add catalyzer heavy magnesium water and react, obtained boron plaster emulsion;
(2) carburizing reagent: continue logical carbonic acid gas after keeping the skin wet in boron plaster emulsion obtained in step (1) and carry out carburizing reagent, then filter to obtain heavy magnesium water and precipitation of calcium carbonate, the heavy magnesium water obtained can be used as catalyzer in step (1);
(3) pyrolytic reaction: carry out pyrolytic reaction by filtering the heavy magnesium water obtained in step (2), the mixed solution after pyrolysis filters, and filter cake washing dries obtained Magnesium Carbonate Light 41-45.
Wherein in the digestion reaction stage, the main reaction occurred is as follows:
CaO+H
2O＝Ca(OH)
2(1)
Mg
2++Ca(OH)
2＝Mg(OH)
2+Ca
2+(2)
Ca
2++MgCO
3＝CaCO
3+Mg
2+(3)
Mg
2++2OH
-＝Mg(OH)
2(4)
HCO
3 -+Ca(OH)
2＝CaCO
3+H
2O+OH
-(5)
In this reaction process, the magnesium ion in formula (2) reacting middle catalyst heavy magnesium water promotes the generation of free calcium ions and magnesium hydroxide.Formula (3) reaction Free Calcium ion reacts obtained magnesium ion further with magnesiumcarbonate, magnesium ion generates magnesium hydroxide further.In formula (5) heavy magnesium water, bicarbonate radical and unnecessary calcium hydroxide reaction generate calcium carbonate, reduce calcium contents in product, improve product purity.This system reaction and so forth circulation generates more magnesium hydroxide, wherein bicarbonate radical and calcium hydroxide reaction generate calcium carbonate and enter precipitated phase, catalyzer Magnesium hydrogen carbonate can not introduce other impurity to system, product purity can also be improved, improve the extraction yield of magnesium simultaneously and reduce the reaction times, and the part heavy magnesium water of catalyst source gained after carbonization.
In the carburizing reagent stage, the main reaction occurred is as follows:
Ca(OH)
2+CO
2＝CaCO
3
Mg(OH)
2+2CO
2＝Mg(HCO
3)
2
CaCO
3+CO
2+H
2O＝Ca(HCO
3)
2
By controlling reaction end pH value, making calcium be converted into calcium carbonate as far as possible and entering precipitated phase, magnesium as far as possible carbonization generates Mg (HCO
3)
2, magnesium with the form of ion enter in solution with other magazins' layout, finally obtain Magnesium Carbonate Light 41-45 through subsequent technique process.
In the pyrolytic reaction stage, the main reaction occurred is as follows:
5Mg(HCO
3)
2＝4MgCO
3·Mg(OH)
2·4H
2O+6CO
2
In pyrolytic reaction, filtrate can be used as catalyzer heavy magnesium water in step (1), makes material obtain recycle.
In described step (1), the mass ratio of boron mud, calcium oxide and water is 1:0.4 ~ 2:2 ~ 8, such as, 1:0.5:2,1:0.6:2.3,1:0.7:2.5,1:0.9:2.7,1:0.4:3,1:0.6:3.3,1:0.6:6,1:1:3.5,1:1.3:3.7,1:1.5:4,1:1.7:4.3,1:1.9:4.5,1:2:4.7,1:2:5,1:0.5:5.3,1:0.5:5.5,1:0.6:5.7,1:0.4:6,1:0.5:6.3,1:0.6:6.5,1:0.7:6.7,1:1:7,1:1.5:7.3,1:2:7.5 or 1:2:8 etc., preferred 1:0.4 ~ 0.6:3 ~ 6.
In described step (1), the concentration of catalyzer heavy magnesium water is 20 ~ 30g/L, such as 20g/L, 21g/L, 22g/L, 23g/L, 24g/L, 25g/L, 26g/L, 27g/L, 28g/L, 29g/L or 30g/L etc., preferably 25 ~ 28g/L.
In described step (1), catalyzer heavy magnesium water and boron mud mass ratio are 0.03 ~ 0.1:1, such as 0.03:1,0.04:1,0.05:1,0.06:1,0.07:1,0.08:1,0.09:1 or 0.1:1 etc., preferably 0.05 ~ 0.08:1.
The temperature of reaction of digestion reaction is 90 ~ 95 DEG C in described step (1), such as 90 DEG C, 91 DEG C, 92 DEG C, 93 DEG C, 94 DEG C or 95 DEG C etc.
In described step (1), the reaction times of digestion reaction is 1.5 ~ 2h, such as 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2h etc.
The quality of the water supplemented in described step (2) is 20 ~ 40 times of calcium oxide quality in step (1), such as 20 times, 21 times, 22 times, 23 times, 24 times, 25 times, 26 times, 27 times, 28 times, 29 times, 30 times, 31 times, 32 times, 33 times, 34 times, 35 times, 36 times, 37 times, 38 times, 39 times or 40 times etc., preferably 30 ~ 40 times.
The temperature of water of supplementing in described step (2) is 0 ~ 30 DEG C, such as 0 DEG C, 3 DEG C, 5 DEG C, 7 DEG C, 10 DEG C, 13 DEG C, 15 DEG C, 17 DEG C, 20 DEG C, 23 DEG C, 25 DEG C, 27 DEG C or 30 DEG C etc., preferably 5 ~ 20 DEG C.
The pressure passing into carbonic acid gas in described step (2) is 0.2 ~ 0.5MPa, such as 0.2MPa, 0.23MPa, 0.25MPa, 0.27MPa, 0.3MPa, 0.33MPa, 0.35MPa, 0.37MPa, 0.4MPa, 0.43MPa, 0.45MPa, 0.47MPa or 0.5MPa etc., preferred 0.4MPa.
In described step (2), carbonation reaction stirs 1 ~ 2h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2h, preferred 1h.
Carbonation reaction temperature is 20 ~ 30 DEG C in described step (2), such as 20 DEG C, 21 DEG C, 22 DEG C, 23 DEG C, 24 DEG C, 25 DEG C, 26 DEG C, 27 DEG C, 28 DEG C, 29 DEG C or 30 DEG C etc.
In described step (2), the terminal of carburizing reagent is pH value of solution is 7 ~ 8, such as 7,7.1,7.2,7.3,7.4,7.5,7.6,7.7,7.8,7.9 or 8 etc., be preferably 7.2.
The temperature of reaction of pyrolytic reaction is 90 ~ 100 DEG C in described step (3), such as 90 DEG C, 91 DEG C, 92 DEG C, 93 DEG C, 94 DEG C, 95 DEG C, 96 DEG C, 97 DEG C, 98 DEG C, 99 DEG C or 100 DEG C etc.
In described step (3), the reaction times of pyrolytic reaction is 1 ~ 1.5h, such as 1h, 1.1h, 1.2h, 1.3h, 1.4h or 1.5h etc.
In described step (2), precipitation of calcium carbonate etc. filter rear slag body for brickmaking.
The Magnesium Carbonate Light 41-45 prepared by method described above reaches technique top grade product, calcium oxide content≤0.2%.
The purposes of the Magnesium Carbonate Light 41-45 prepared by method described above, it is applied to rubber, plastics, food-processing, health care, insulating material and glass art.
Beneficial effect:
The method of the invention is optimized the technique of traditional boron peat legal system for Magnesium Carbonate Light 41-45, and its beneficial effect is mainly reflected in the following aspects:
(1) this technique adds catalyzer heavy magnesium water at digestion phase, the transformation efficiency of magnesium in digestion phase boron mud is made to bring up to about 85% by 60%, the digestion reaction time shortens to 1.5h-2.5h by 2h-3.5h, impurity can not be introduced to the finished product adding of Magnesium hydrogen carbonate simultaneously, bicarbonate ion changes into carbonate at digestion phase, carbonate directly and calcium binding enter in precipitation, reduce calcium ion in solution, thus system meets the high purity light magnesiumcarbonate of " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42-43.5%, impurity CaO content is less than 0.2%, other impurity all meets the requirement of top grade product.
(2) the catalyzer heavy magnesium water added in the present invention comes from the solution obtained after carburizing reagent is filtered, calcium oxide used and carbonic acid gas come from products obtained therefrom after the calcination of calcium carbonate generated in carburizing reagent, make whole technique achieve zero release, reduce production cost.Meanwhile, this technique is low for equipment requirements, process, advanced technology, economical rationality, have larger use value and promotional value, realizes the high unity of ecological benefits, environmental benefit, economic benefit, social benefit.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of boron peat legal system for the method for Magnesium Carbonate Light 41-45.
Embodiment
For better the present invention being described, be convenient to understand technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
Embodiment 1:
1,1:0.5:5 takes boron mud 1kg, calcium oxide 0.5kg and water 5kg mixing and stirring in proportion, and 0.03:1 adds the heavy magnesium water 0.03kg that concentration is 25g/L in mass ratio, at temperature 95 DEG C, react 2h, obtains digestion solution.
2, above-mentioned digestion mixed solution is poured in carbonization tank, the water 10kg of the calcareous amount of extra supplemental 20 times in carbonization tank, temperature is 10 DEG C, open recirculated water simultaneously and carry out outer circulation cooling, carbonization temperature is made to remain between 20-30 DEG C, pass into the carbon dioxide that pressure is about 0.4MPa, carbonization 1h, carbonization terminal pH is 7.26.
3, filtered by the mixed solution after carbonization, filter residue can be used for brickmaking or calcining, and the filtrate portion catalyzer that does capable of circulation uses.Filtrate is pyrolysis 1.5h at 95 DEG C, and after pyrolysis, suction filtration, washing and drying obtain Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42.3%, CaO content is 0.16%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 84%.
Embodiment 2:
1,1:0.4:3 takes boron mud 1kg, calcium oxide 0.4kg and water 3kg mixing and stirring in proportion, and 0.06:1 adds the heavy magnesium water 0.06kg that concentration is 28g/L in mass ratio, at temperature 95 DEG C, react 2h, obtains digestion solution.
2, above-mentioned digestion mixed solution is poured in carbonization tank, the water 10kg of the calcareous amount of extra supplemental 20 times in carbonization tank, temperature is 20 DEG C, open recirculated water simultaneously and carry out outer circulation cooling, carbonization temperature is made to remain between 20-30 DEG C, pass into the carbon dioxide that pressure is about 0.4MPa, carbonization 1h, carbonization terminal pH is 7.24.
3, filtered by the mixed solution after carbonization, filter residue can be used for brickmaking or calcining, and the filtrate portion catalyzer that does capable of circulation uses.Filtrate is pyrolysis 1.5h at 95 DEG C, and after pyrolysis, suction filtration, washing and drying obtain Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42.5%, CaO content is 0.15%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 83%.
Embodiment 3:
1,1:0.5:5 takes boron mud 1kg, calcium oxide 0.5kg and water 5kg mixing and stirring in proportion, and 0.05:1 adds the heavy magnesium water 0.05kg that concentration is 25g/L in mass ratio, at temperature 95 DEG C, react 2h, obtains digestion solution.
2, above-mentioned digestion mixed solution is poured in carbonization tank, the water 20kg of the calcareous amount of extra supplemental 40 times in carbonization tank, temperature is 10 DEG C, open recirculated water simultaneously and carry out outer circulation cooling, carbonization temperature is made to remain between 20-30 DEG C, pass into the carbon dioxide that pressure is about 0.4MPa, carbonization 1h, carbonization terminal pH is 7.23.
3, filtered by the mixed solution after carbonization, filter residue can be used for brickmaking or calcining, and the filtrate portion catalyzer that does capable of circulation uses.Filtrate is pyrolysis 1.5h at 95 DEG C, and after pyrolysis, suction filtration, washing and drying obtain Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42.7%, CaO content is 0.13%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 85%.
Embodiment 4:
1,1:0.6:6 takes boron mud 1kg, calcium oxide 0.6kg and water 6kg mixing and stirring in proportion, and 0.08:1 adds the heavy magnesium water 0.08kg that concentration is 26g/L in mass ratio, at temperature 95 DEG C, react 1.5h, obtains digestion solution.
2, above-mentioned digestion mixed solution is poured in carbonization tank, the water 18kg of the calcareous amount of extra supplemental 30 times in carbonization tank, temperature is 20 DEG C, open recirculated water simultaneously and carry out outer circulation cooling, carbonization temperature is made to remain between 20-30 DEG C, pass into the carbon dioxide that pressure is about 0.4MPa, carbonization 1h, carbonization terminal pH is 7.24.
3, filtered by the mixed solution after carbonization, filter residue can be used for brickmaking or calcining, and the filtrate portion catalyzer that does capable of circulation uses.Filtrate is pyrolysis 1.5h at 95 DEG C, and after pyrolysis, suction filtration, washing and drying obtain Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 43%, CaO content is 0.1%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 85%.
Embodiment 5:
1,1:0.4:2 takes boron mud 1kg, calcium oxide 0.4kg and water 2kg mixing and stirring in proportion, and 0.04:1 adds the heavy magnesium water 0.04kg that concentration is 30g/L in mass ratio, at temperature 90 DEG C, react 1.5h, obtains digestion solution.
2, above-mentioned digestion mixed solution is poured in carbonization tank, the water 14kg of the calcareous amount of extra supplemental 35 times in carbonization tank, temperature is 5 DEG C, open recirculated water simultaneously and carry out outer circulation cooling, carbonization temperature is made to remain between 20-30 DEG C, pass into the carbon dioxide that pressure is about 0.5MPa, carbonization 1.5h, carbonization terminal pH is 7.2.
3, filtered by the mixed solution after carbonization, filter residue can be used for brickmaking or calcining, and the filtrate portion catalyzer that does capable of circulation uses.Filtrate is pyrolysis 1h at 90 DEG C, and after pyrolysis, suction filtration, washing and drying obtain Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42.8%, CaO content is 0.13%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 84%.
Embodiment 6:
1,1:0.7:8 takes boron mud 1kg, calcium oxide 0.7kg and water 6kg mixing and stirring in proportion, and 0.08:1 adds the heavy magnesium water 0.08kg that concentration is 20g/L in mass ratio, at temperature 90 DEG C, react 2h, obtains digestion solution.
2, above-mentioned digestion mixed solution is poured in carbonization tank, the water 24.5kg of the calcareous amount of extra supplemental 35 times in carbonization tank, temperature is 0 DEG C, open recirculated water simultaneously and carry out outer circulation cooling, carbonization temperature is made to remain between 20-30 DEG C, pass into the carbon dioxide that pressure is about 0.2MPa, carbonization 2h, carbonization terminal pH is 7.24.
3, filtered by the mixed solution after carbonization, filter residue can be used for brickmaking or calcining, and the filtrate portion catalyzer that does capable of circulation uses.Filtrate is pyrolysis 1h at 100 DEG C, and after pyrolysis, suction filtration, washing and drying obtain Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42.9%, CaO content is 0.13%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 84%.
Embodiment 7:
Except in step 1 in proportion 1:2:8 take boron mud 1kg, calcium oxide 2kg and water 8kg mixing and stirring, in step 2, digestion time is 3h, the water 16kg of the calcareous amount of extra supplemental 40 times, and temperature is outside 30 DEG C, other steps are in the same manner as in Example 1, obtained Magnesium Carbonate Light 41-45.Pass through complexometric titration, the quality of product meets " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42.6%, CaO content is 0.14%, other component concentration meets the requirement of top grade product, and in boron mud, the extraction yield of magnesium is 85%.
Comparative example 1:
Except not adding except catalyzer heavy magnesium water in step 1, other steps are all in the same manner as in Example 1, obtained Magnesium Carbonate Light 41-45.By complexometric titration, the quality of product meets " acceptable end product " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", and content of MgO is 42.5%, CaO content is 0.6%, and in boron mud, the extraction yield of magnesium is 60%.
In above embodiment 1-7 and comparative example 1, in product purity and boron mud, the extraction yield of magnesium is summarized in table 1.
Table 1: product purity and magnesium extraction yield table in embodiment and comparative example
Data in integrated embodiment 1-7 and comparative example 1 can be found out, this technique adds catalyzer heavy magnesium water at digestion phase, the transformation efficiency of magnesium in digestion phase boron mud is made to bring up to about 85% by 60%, the digestion reaction time shortens to 1.5h-2.5h by 2h-3.5h, impurity can not be introduced to the finished product adding of Magnesium hydrogen carbonate simultaneously, bicarbonate ion changes into carbonate at digestion phase, carbonate directly and calcium binding enter in precipitation, reduce calcium ion in solution, thus system meets the high purity light magnesiumcarbonate of " premium grads " standard of regulation in national standard " HG-T 2959-2010 industry hydrated basic magnesium carbonate ", content of MgO is 42-43.5%, impurity CaO content is less than 0.2%, other impurity all meets the requirement of top grade product.
Meanwhile, the catalyzer heavy magnesium water added in the present invention come from carburizing reagent filter after the solution that obtains, calcium oxide used and carbonic acid gas come from products obtained therefrom after limestone calcination, reduce production cost.Meanwhile, this technique is low for equipment requirements, process, advanced technology, economical rationality, have larger use value and promotional value, realizes the high unity of ecological benefits, environmental benefit, economic benefit, social benefit.
Applicant states, the present invention illustrates method detailed of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned method detailed, does not namely mean that the present invention must rely on above-mentioned method detailed and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (10)
1. boron peat legal system is for a method for Magnesium Carbonate Light 41-45, it is characterized in that, the method comprises the following steps:
(1) digestion reaction: after boron mud, calcium oxide and water are mixed, add catalyzer heavy magnesium water and react, obtained boron plaster emulsion;
(2) carburizing reagent: continue logical carbonic acid gas after keeping the skin wet in boron plaster emulsion obtained in step (1) and carry out carburizing reagent, filter to obtain heavy magnesium water and precipitation of calcium carbonate, the heavy magnesium water obtained can be used as catalyzer in step (1);
(3) pyrolytic reaction: carry out pyrolytic reaction by filtering the heavy magnesium water obtained in step (2), the mixed solution after pyrolysis filters, and filter cake washing dries obtained Magnesium Carbonate Light 41-45.
2. method according to claim 1, is characterized in that, in described step (1), the mass ratio of boron mud, calcium oxide and water is 1:0.4 ~ 2:2 ~ 8, preferred 1:0.4 ~ 0.6:3 ~ 6;
Preferably, in described step (1), the concentration of catalyzer heavy magnesium water is 20 ~ 30g/L, preferably 25 ~ 28g/L;
Preferably, in described step (1), catalyzer heavy magnesium water and boron mud mass ratio are 0.03 ~ 0.1:1, preferably 0.05 ~ 0.08:1.
3. method according to claim 1 and 2, is characterized in that, in described step (1), the temperature of reaction of digestion reaction is 90 ~ 95 DEG C;
Preferably, in described step (1), the reaction times of digestion reaction is 1.5 ~ 2h.
4. the method according to any one of claim 1-3, is characterized in that, in described step (2), the quality of moisturizing is 20 ~ 40 times of calcium oxide quality in step (1), preferably 30 ~ 40 times;
Preferably, the temperature of the water supplemented in described step (2) is 0 ~ 30 DEG C, preferably 5 ~ 20 DEG C;
Preferably, the pressure passing into carbonic acid gas in described step (2) is 0.2 ~ 0.5MPa, preferred 0.4MPa.
5. the method according to any one of claim 1-4, is characterized in that, in described step (2), carbonation reaction stirs 1 ~ 2h, preferred 1h;
Preferably, in described step (2), carbonation reaction temperature is 20 ~ 30 DEG C;
Preferably, in described step (2), the terminal of carburizing reagent is pH value of solution is 7 ~ 8, is preferably 7.2.
6. the method according to any one of claim 1-5, is characterized in that, in described step (3), the temperature of reaction of pyrolytic reaction is 90 ~ 100 DEG C.
7. the method according to any one of claim 1-6, is characterized in that, in described step (3), the reaction times of pyrolytic reaction is 1 ~ 1.5h.
8. the method according to any one of claim 1-7, is characterized in that, in described step (2), precipitation of calcium carbonate is used for brickmaking.
9. the Magnesium Carbonate Light 41-45 that the method according to any one of claim 1-8 prepares, is characterized in that, oxidation of impurities calcium contents≤0.2% in described Magnesium Carbonate Light 41-45.
10. the purposes of the Magnesium Carbonate Light 41-45 that the method according to any one of claim 1-8 prepares, it is applied to rubber, plastics, food-processing, health care, insulating material and glass art.
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