CN105036165A - Decolorizing method for high-concentration sodium aluminate solution - Google Patents
Decolorizing method for high-concentration sodium aluminate solution Download PDFInfo
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- CN105036165A CN105036165A CN201510540357.3A CN201510540357A CN105036165A CN 105036165 A CN105036165 A CN 105036165A CN 201510540357 A CN201510540357 A CN 201510540357A CN 105036165 A CN105036165 A CN 105036165A
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- sodium aluminate
- aluminate solution
- activated magnesia
- magnesium oxide
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Abstract
The invention discloses a method for decolorizing a sodium aluminate solution through ultramicro-pulverized powder active magnesium oxide. Firstly, the active magnesium oxide is prepared, wherein magnesium oxide is added into an aluminum oxide liner plate ball grinding mill to carry out wet grinding, and the particle size of the active magnesium oxide is distributed in the particle size intervals of 0.1 micron-10 microns, 0-0.044 mm, 0.044 mm-0.074 mm and 0.074-1 mm; the high-concentration sodium aluminate solution is conveyed into a buffering tank through a pump, the active magnesium oxide is added at the amount that 2-5 g of active magnesium oxide is added in each liter of the sodium aluminate solution, mechanical stirring at the constant temperature is carried out, and the decolorized sodium aluminate solution is obtained after separation is carried out though a leaf filter. The decolorizing method has the advantages that the technology process is simple, cost is low, the decolorizing effect is good, pollution is avoided, and clean production is achieved.
Description
Technical field
The present invention relates to a kind of decoloring method of sodium aluminate solution, particularly relate to a kind of method using super-fine powder activated magnesia to decolour to high-concentration sodium aluminate solution.
Background technology
Produce in aluminium hydroxide process in Bayer process, the various humates that the incidental humic acid organic substances of ore and alkaline reaction generate enter in sodium aluminate solution, make sodium aluminate solution composition more complicated, also make sodium aluminate solution be garnet, brown or tawny etc.In kind point decomposition course, humate can be adsorbed on surface of aluminum hydroxide, cause product tape color, reduce the whiteness of aluminium hydroxide, and some organism added in aluminium hydroxide production process equally also can affect the purity of aluminium hydroxide, thus can not meet the requirement of the aluminium hydroxide of special purpose.
In addition, when with Bayer process aluminium hydroxide for raw material is prepared in high-end high white superfine aluminium hydroxide production process, then more strict to the quality requirements of sodium aluminate solution, sodium aluminate solution is through circulation many times, various impurity all likely enters mother liquor, or enrichment in sodium aluminate solution, sodium aluminate solution is made to present certain color, it is generally yellow or tawny, product whiteness is made not reach more than 98%, belong to middle white aluminum hydroxide, seriously constrain the aluminium hydroxide Application Areas produced.
Disclose organic purifying method in a kind of bayer liquors at patent documentation CN101058433A, CN1377829A disclose a kind ofly from Bayer process sodium aluminate solution, remove organic technique, manufacture method that CN1010624200A discloses a kind of sodium aluminate aqueous solution of decolouring, be all for low concentration (Al
2o
3< 100g/L) Bayer process sodium aluminate solution, and do not consider the organism of component in solution complexity and removing of inorganic contaminants, especially the after product that decolours is discharged as waste residue, cause a kind of waste of resource, and easily to environment, and in decolorization, alumina loss is comparatively large, is equivalent to add production cost.
Summary of the invention
The object of the invention is the deficiency in order to solve the problems of the technologies described above existence, providing that a kind of technical process is simple, cost is low, the decoloring method of good decolorizing effect, pollution-free, the high-concentration sodium aluminate solution that realizes cleanly production.
The technical solution adopted in the present invention is, the decoloring method of this sodium aluminate solution is:
The preparation of step one, activated magnesia: magnesium oxide is joined in the ball mill of aluminum oxide liner plate and carry out wet-milling, grinding medium is alumina balls, ratio of grinding media to material is 3-5, admittedly containing 250-350g/L, milling time is 2-3 hour, after grinding, the size-grade distribution of activated magnesia at 0.1 μm-10 μm, the grain size intervals in 0-0.044mm, 0.044mm-0.074mm, 0.074-1mm;
The preparation of step 2, high-concentration sodium aluminate solution: add the aluminium hydroxide that Bayer process is produced in the dissolving tank filling mother liquid evaporation, aluminium hydroxide, through stirring and dissolving completely after steam heating, just can obtain the sodium aluminate solution of high density, the Al of sodium aluminate solution
2o
3concentration is 150 ~ 200g/L;
Step 3, by the sodium aluminate solution of high density through pump delivery in dashpot, add the activated magnesia that step one prepares again, the addition of activated magnesia is that often liter of sodium aluminate solution adds superactivity magnesium oxide 2-5 gram, be heated to 70 ~ 100 degree, constant temperature mechanical stirring, in 1 ~ 2 hour reaction times, after leaf filter is separated, obtain the sodium aluminate solution after decolouring.
The wherein activated magnesia that obtains of step one, size-grade distribution is at 0.1 μm-10 μm, grain size intervals in 0-0.044mm, 0.044mm-0.074mm, 0.074-1mm, activated magnesia part granularity has reached super-fine powder level, due to its Particle pollution, surface atom and the large percentage of body phase atomicity, thus have high chemically reactive, physical adsorption ability, high reactivity and polymolecularity, be easy to and superpolymer or other materials compound; When the super-fine powder magnesium oxide after mill is joined in high temperature aluminum acid sodium solution, super-fine powder magnesium oxide immediately with water generation hydration reaction, first super-fine powder magnesium oxide carry out chemical reaction to the water absorption of surrounding and form a magnesium hydroxide upper layer, and this upper layer is also unstable, spread in very fast water towards periphery, and organism in the process of diffusion in quick adsorption sodium aluminate solution and humate, separate out with the form precipitated, thus reach the object of decolouring.
Mother liquid evaporation wherein in step 2 is the Na that the decomposition nut liquid that is isolated to of aluminum hydroxide slurry obtains after inspissation contracting
2the liquid that O is dense, sends back to the aluminium hydroxide that FEOL is produced for dissolving Bayer process.
Wherein in step 3, the addition of activated magnesia is that often liter of sodium aluminate solution adds activated magnesia 2-5 gram, as activated magnesia add-on 2-3, the effect of decolouring increases along with activated magnesia add-on and strengthens, but when activated magnesia add-on 3-5, the effect of decolouring increases along with activated magnesia add-on and weakens, this and common process, the effect of namely decolouring should increase along with activated magnesia add-on and strengthen, just in time contrary, therefore activated magnesia add-on optimum is 3 grams.
The wherein insolubles of step 3 after leaf filter is separated, by the starting material as producing magnalium complexes recyclable after press filtration, also can be made into high fine and close brilliant fine ceramics, the tip materials under the severe condition such as high temperature, high corrosion can be developed as, therefore the present invention's waste residue in Production Flow Chart can utilize completely, turn waste into wealth, thus achieve cleanly production.
The colourity of the decolouring sodium aluminate solution that the present invention obtains can reach 470nm, and absorbancy is less than 0.08.
Therefore, the present invention have that technical process is simple, facility investment is few, cost is low, simple to operate, good decolorizing effect, the advantage such as pollution-free, environmental protection.
Embodiment
Following examples describe the present invention in detail.
Embodiment 1:
The preparation of step one, activated magnesia: magnesium oxide is joined in the ball mill of aluminum oxide liner plate and carry out wet-milling, grinding medium is alumina balls, ratio of grinding media to material is 3, admittedly containing 250g/L, milling time is 2 hours, after grinding, the size-grade distribution of activated magnesia at 0.1 μm-10 μm, the grain size intervals in 0-0.044mm, 0.044mm-0.074mm, 0.074-1mm;
The preparation of step 2, high-concentration sodium aluminate solution: add the aluminium hydroxide that Bayer process is produced in the dissolving tank filling mother liquid evaporation, aluminium hydroxide, through stirring and dissolving completely after steam heating, just can obtain the sodium aluminate solution of high density, the Al of sodium aluminate solution
2o
3concentration is 150g/L;
Step 3, by the sodium aluminate solution of high density through pump delivery in dashpot, add the activated magnesia that step one prepares again, the addition of activated magnesia is that often liter of sodium aluminate solution adds activated magnesia 2 grams, be heated to 70 degree, constant temperature mechanical stirring, in 1 hour reaction times, after leaf filter is separated, obtain the sodium aluminate solution after decolouring.
Embodiment 2:
The preparation of step one, activated magnesia: magnesium oxide is joined in the ball mill of aluminum oxide liner plate and carry out wet-milling, grinding medium is alumina balls, ratio of grinding media to material is 4, admittedly containing 300g/L, milling time is 2 hours, after grinding, the size-grade distribution of activated magnesia at 0.1 μm-10 μm, the grain size intervals in 0-0.044mm, 0.044mm-0.074mm, 0.074-1mm;
The preparation of step 2, high-concentration sodium aluminate solution: add the aluminium hydroxide that Bayer process is produced in the dissolving tank filling mother liquid evaporation, aluminium hydroxide, through stirring and dissolving completely after steam heating, just can obtain the sodium aluminate solution of high density, the Al of sodium aluminate solution
2o
3concentration is 160g/L;
Step 3, by the sodium aluminate solution of high density through pump delivery in dashpot, add the activated magnesia that step one prepares again, the addition of activated magnesia is that often liter of sodium aluminate solution adds activated magnesia 3 grams, be heated to 90 degree, constant temperature mechanical stirring, in 2 hours reaction times, after leaf filter is separated, obtain the sodium aluminate solution after decolouring.
Embodiment 3:
The preparation of step one, activated magnesia: magnesium oxide is joined in the ball mill of aluminum oxide liner plate and carry out wet-milling, grinding medium is alumina balls, ratio of grinding media to material is 5, admittedly containing 350g/L, milling time is 3 hours, after grinding, the size-grade distribution of activated magnesia at 0.1 μm-10 μm, the grain size intervals in 0-0.044mm, 0.044mm-0.074mm, 0.074-1mm;
The preparation of step 2, high-concentration sodium aluminate solution: add the aluminium hydroxide that Bayer process is produced in the dissolving tank filling mother liquid evaporation, aluminium hydroxide, through stirring and dissolving completely after steam heating, just can obtain the sodium aluminate solution of high density, the Al of sodium aluminate solution
2o
3concentration is 200g/L;
Step 3, by the sodium aluminate solution of high density through pump delivery in dashpot, add the activated magnesia that step one prepares again, the addition of activated magnesia is that often liter of sodium aluminate solution adds activated magnesia 5 grams, be heated to 100 degree, constant temperature mechanical stirring, in 2 hours reaction times, after leaf filter is separated, obtain the sodium aluminate solution after decolouring.
The above, only for illustration of embodiments of the present invention, but the present invention is not limited to above-mentioned embodiment, as long as do not depart from technical solution of the present invention content and make any amendment, equivalent variations and improvement, still belongs to the protection category of technical solution of the present invention.
Claims (3)
1. the decoloring method of a high-concentration sodium aluminate solution, it is characterized in that: the preparation of step one, activated magnesia: joined by magnesium oxide in the ball mill of aluminum oxide liner plate and carry out wet-milling, grinding medium is alumina balls, and ratio of grinding media to material is 3-5, admittedly containing 250-350g/L, milling time is 2-3 hour; The preparation of step 2, high-concentration sodium aluminate solution: add the aluminium hydroxide that Bayer process is produced in the dissolving tank filling mother liquid evaporation, aluminium hydroxide, through stirring and dissolving completely after steam heating, just can obtain the sodium aluminate solution of high density, the Al of sodium aluminate solution
2o
3concentration is 150 ~ 200g/L; Step 3, by the sodium aluminate solution of high density through pump delivery in dashpot, add the activated magnesia that step one prepares again, the addition of activated magnesia is that often liter of sodium aluminate solution adds superactivity magnesium oxide 2-5 gram, be heated to 70 ~ 100 degree, constant temperature mechanical stirring, reaction times 1-2 hour, after leaf filter is separated, obtains the sodium aluminate solution after decolouring.
2. the decoloring method of a kind of high-concentration sodium aluminate solution according to claim 1, it is characterized in that: in step one after grinding, the size-grade distribution of activated magnesia at 0.1 μm-10 μm, the grain size intervals in 0-0.044mm, 0.044mm-0.074mm, 0.074-1mm.
3. the decoloring method of a kind of high-concentration sodium aluminate solution according to claim 1, is characterized in that: in step 3, the addition of activated magnesia is often liter of sodium aluminate solution interpolation activated magnesia 3 grams.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109399676A (en) * | 2017-08-16 | 2019-03-01 | 郑州中绿环保新材料有限公司 | A kind of industrial sodium aluminate solution method of purification |
| CN113846217A (en) * | 2021-09-28 | 2021-12-28 | 贵州中伟资源循环产业发展有限公司 | Nickel hydroxide and preparation method thereof |
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