CN103708517A - Method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate - Google Patents
Method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate Download PDFInfo
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Abstract
The invention discloses a method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate. The method comprises the following steps: (1) respectively presintering aluminum hydroxide and calcite powder at high temperature, naturally cooling, and grinding to obtain aluminum oxide powder and calcium oxide powder; (2) proportionally and evenly mixing the aluminum oxide powder and calcium oxide powder with high-heating-value coal powder to obtain spheres, calcining at high temperature, naturally cooling, and grinding to obtain high-whiteness calcium aluminate powder; and (3) adding the calcium aluminate powder as a basicity regulator into an iron-free aluminum chloride solution to react, adding high-purity aluminum to remove iron to obtain an iron-free polyaluminum chloride liquid, and carrying out spray drying on the liquid polyaluminum chloride to obtain the powdery iron-free polyaluminum chloride. The powdery iron-free polyaluminum chloride has the advantages of favorable coagulation effect, low heavy metal content, satisfactory residual aluminum content in the treated effluent water, and low production cost; and other quality indexes can satisfy the standard requirements in Polyaluminum Chloride for Domestic Drinking Water (GB15892-2009).
Description
Technical field
The present invention relates to inorganic aluminate water purification agent field, be specifically related to a kind of method that high whiteness calcium aluminate is prepared powdery iron-free poly aluminium chloride.
Background technology
Poly aluminium chloride has the advantages such as good drug efficacy, dosage is few, easy to use, price is low, has become the most popular Drinking Water of China and has processed one of water purification agent.And the Chinese government and the common people also more and more pay attention to the safety of Drinking Water, require more and more stricter.In the < < drinking water sanitary standard > > of country (GB 5749-2006), stipulate the control criterion of heavy (class) metals such as arsenic, cadmium, chromium (sexavalence), mercury, lead, in original standard base, revised heavy (class) metal index such as arsenic, cadmium, lead.Answer in contrast, < < Drinking Water has been stipulated the control criterion of heavy (class) metals such as arsenic, cadmium, chromium (sexavalence), mercury, lead equally with poly aluminium chloride > > (GB15892-2009).Requirement according to < < Drinking Water by poly aluminium chloride > > (GB15892-2009) standard, it is qualified that the drinking water using poly aluminium chloride product that at present a lot of enterprises produce is difficult to.National correlation department tissue in 2013 is revised to adapt to < < drinking water sanitary standard > > (GB 5749-2006) to < < Drinking Water by poly aluminium chloride > > (GB15892-2009) standard and is enforced the requirement to water quality.The < < Drinking Water of revising will propose stricter requirement to the quality of poly aluminium chloride with poly aluminium chloride > > new standard, makes the production of poly aluminium chloride industry be faced with larger challenge.
The main production technique such as the sour molten two step method of bauxitic clay (or flyash), calcium aluminate acid-soluble one-step, aluminium hydroxide acid-soluble one-step and the molten two step method of hydroxide aluminic acid that adopt in China's poly aluminium chloride industry production.Wherein with calcium aluminate, regulating basicity to produce is the poly aluminium chloride production method of China's original creation, comprise the sour molten two step method of bauxitic clay (or flyash) (main raw material is bauxitic clay or flyash, calcium aluminate and hydrochloric acid), calcium aluminate acid-soluble one-step (main raw material is calcium aluminate and hydrochloric acid) and the molten two step method of hydroxide aluminic acid (main raw material is aluminium hydroxide, calcium aluminate and hydrochloric acid), China adopts above-mentioned processing method over 90% poly aluminium chloride manufacturing enterprise.Only less than 10% poly aluminium chloride manufacturing enterprise employing aluminium hydroxide acid-soluble one-step (main raw material is aluminium hydroxide and hydrochloric acid), produce.In drinking water treatment field, mainly there is following problem in these methods:
(1) the sour molten two step method coverage rate of bauxitic clay (or flyash) is the widest, it has advantages of, and technique is simple, working condition is gentle, easy to operate, raw material and production cost low.But because the impact of impurity in raw material causes product purity not good, heavy metal content is higher, product is yellow, the even darker color of tawny.This series products should not be for drinking water treatment;
(2) calcium aluminate acid-soluble one-step equally also has the advantages such as technique is simple, working condition is gentle, easy to operate, but calcium aluminate price rises steadily in recent years, this explained hereafter cost constantly raises up, and product heavy metal content is also higher, should not be for drinking water treatment;
(3) advantages such as the poly aluminium chloride product that aluminium hydroxide acid-soluble one-step is produced has that purity is high, quality better, white color, heavy metal content are low, can be used for the production of drinking water treatment and paper industry.But the condition that cost of material is expensive, production process needs High Temperature High Pressure is harsh, production unit loss is large, and product basicity is low, and coagulation effect is poor, and the chemical feeding quantity needing is large, carry out after drinking water treatment in water residual aluminum higher in water treatment;
(4) the molten two step method of hydroxide aluminic acid have working condition gentleness, product coagulation effect good, for advantages such as the residual Al of water after drinking water treatment are low, be at present for the main product of drinking water treatment.But be subject to the impact of calcium aluminate raw material, in product, heavy metal content is unstable, and often appearance can not reach the phenomenon of poly aluminium chloride > > (GB15892-2009) standard-required for < < Drinking Water.
According to the development trend of current inorganic aluminate water purification agent, develop and be suitable for the poly aluminium chloride product efficient, that residual aluminum is low, heavy metal content is low that Drinking Water treatment industry used and will be the focus of studying at present and in the future.
Summary of the invention
Technical problem to be solved by this invention is to provide that a kind of coagulation effect is good, heavy metal content is low, process after water outlet residual aluminum up to standard, production cost is not high, other quality index can meet < < Drinking Water and with the high whiteness calcium aluminate of poly aluminium chloride > > (GB15892-2009) standard-required, prepare the method for powdery iron-free poly aluminium chloride.
In order to solve the problems of the technologies described above, high whiteness calcium aluminate provided by the invention is prepared the method for powdery iron-free poly aluminium chloride, comprises following raw material and preparation process:
(1) aluminium hydroxide that is, 64%～65% by quality of alumina content and calcium carbonate mass content are greater than 98%, whiteness is greater than calcite in powder pre-burning at 850 ℃～950 ℃ temperature of 90% and naturally cools to normal temperature after 3 hours～5 hours, then worn into respectively 80 order～120 order powders, obtained the activated aluminum oxide powder of tool and calcium oxide powder;
(2) by aluminum oxide powder, calcium oxide powder and the calorific value of step (1) gained, be, that more than 7000kcal/kg coal dust is 55%～60%, 30%～35% and 10% to mix by massfraction respectively, add appropriate clear water stirring and make spherule, through the temperature of 1200 ℃～1300 ℃, calcine 4 hours～6 hours again, after naturally cooling to normal temperature, wear into 100 order～180 order powders, obtain quality of alumina content and be 60%～65% high whiteness calcium aluminate powder;
(3), in the iron-free aluminum chloride liquid that is 5.0%～10.0% at quality of alumina mark, low whipping speed is under 120 revs/min～200 revs/min conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 25 ℃～100 ℃, to react 60 minutes～90 minutes, 1.0%～3.0% the rafifinal deironing 30 minutes～60 minutes that adds again calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this poly aluminium chloride liquid, at hot blast temperature, it is 280 ℃～300 ℃, tail air temperature is at 100 ℃～110 ℃, to spray to be dried, obtain quality of alumina content and be 29%～33% powdery iron-free poly aluminium chloride, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.
The high whiteness calcium aluminate of employing technique scheme is prepared the method for powdery iron-free poly aluminium chloride, has following features:
1, it is raw material that aluminium hydroxide and calcite are take in the preparation of high whiteness calcium aluminate, calcining through secondary differing temps, first by aluminium hydroxide and calcite in powder respectively at 850 ℃～950 ℃ temperature pre-burning within 2 hours～5 hours, activate, and then by the aluminum oxide powder of gained, calcium oxide powder and calorific value are that the coal dust of 7000kcal/kg is 55%～60% by massfraction respectively, 30%～35% and 10% mixes and through the temperature of 1200～1300 ℃, calcines 4 hours～6 hours, obtaining quality of alumina content is the high whiteness calcium aluminate powder of 60 %～65%, this technical characterstic can guarantee that calcining temperature is lower than 1300 ℃, existing calcium aluminate rotary kiln production equipment can be adapted to, do not need to build special-purpose Sweet natural gas or the high temperature resistant calciner of heavy oil,
2, the high whiteness calcium aluminate powder of gained activity is high, iron-free concentration of aluminum chloride and the temperature that can be 5.0 %～10.0% at quality of alumina mark be to produce poly aluminium chloride liquid under 30 ℃～100 ℃ conditions, the rafifinal deironing of process calcium aluminate massfraction 1.0 %～3.0% 30 minutes～60 minutes, after filtering, gained is iron-free poly aluminium chloride liquid, by this liquid poly aluminium chloride, at hot blast temperature, it is 280 ℃～300 ℃, tail air temperature is at 100 ℃～110 ℃, to spray to be dried, obtain quality of alumina content and be 29%～31% powdery iron-free poly aluminium chloride, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.This technical characterstic makes the high whiteness calcium aluminate powder of gained not only can be for existing poly aluminium chloride manufacturing enterprise, also can meet Running-water Company and in the situation that there is no heating unit, make the poly aluminium chloride that the < < Drinking Water that is up to state standards requires with poly aluminium chloride > > (GB15892-2009) by oneself, for drink water purifying, process;
3, no matter gained powdery iron-free poly aluminium chloride is that coagulation effect or whiteness are all better than similar products at home and abroad level, can meet the needs of domestic and international market to high-quality poly aluminium chloride product, and production process meets cleaner production and environmental requirement.
In sum, the present invention is that a kind of coagulation effect is good, heavy metal content is low, after processing, water outlet residual aluminum is up to standard, production cost is not high, other quality index can meet < < Drinking Water and with the high whiteness calcium aluminate of poly aluminium chloride > > (GB15892-2009) standard-required, prepare the method for powdery iron-free poly aluminium chloride, for domestic aluminium salt industry provides a kind of high-quality poly aluminium chloride product of reaching advanced world standards, and production cost is lower than international like product, production technology is simple, production process environmental protection.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
embodiment 1:
High whiteness calcium aluminate is prepared the method for powdery iron-free poly aluminium chloride, comprises following raw material and preparation process:
(1) aluminium hydroxide that is, 64% by 1000g quality of alumina content and 1000g calcium carbonate mass content 98.5%, the pre-burning at 850 ℃ of temperature of the calcite in powder of whiteness 91% naturally cooled to normal temperature after 5 hours, then worn into respectively 80 order powders, obtained the activated aluminum oxide 630g of tool and 550g calcium oxide powder;
(2), getting aluminum oxide powder 550g, the calcium oxide powder 350g of step (1) gained and coal dust 100g that calorific value is 7100kcal/kg mixes, add appropriate clear water stirring and make spherule, through the temperature of 1200 ℃, calcine 6 hours again, after naturally cooling to normal temperature, wear into 100 order powders, obtain quality of alumina content and be 60% high whiteness calcium aluminate powder 900g;
(3), in the iron-free aluminum chloride liquid that is 5.0% at 10000g quality of alumina mark, low whipping speed is under 120 revs/min of conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 25 ℃, to react 90 minutes, 1.5% the rafifinal deironing 60 minutes that adds again calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this liquid poly aluminium chloride, at hot blast temperature, it is 280 ℃, tail air temperature is at 105 ℃, to spray to be dried, obtain the powdery iron-free poly aluminium chloride that 3460g quality of alumina content is 30%, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.
embodiment 2:
High whiteness calcium aluminate is prepared the method for powdery iron-free poly aluminium chloride, comprises following raw material and preparation process:
(1) aluminium hydroxide that is, 64.5% by 1000g quality of alumina content and 1000g calcium carbonate mass content 99%, the pre-burning at 900 ℃ of temperature of the calcite in powder of whiteness 92% naturally cooled to normal temperature after 4 hours, then worn into respectively 100 order powders, obtained the activated aluminum oxide 645g of tool and 550g calcium oxide powder;
(2), getting aluminum oxide powder 600g, the calcium oxide powder 300g of step (1) gained and coal dust 100g that calorific value is 7100kcal/kg mixes, add appropriate clear water stirring and make spherule, through the temperature of 1250 ℃, calcine 5 hours again, after naturally cooling to normal temperature, wear into 120 order powders, obtain quality of alumina content and be 65% high whiteness calcium aluminate powder 920g;
(3), in the iron-free aluminum chloride liquid that is 10.0% at 6000g quality of alumina mark, low whipping speed is under 150 revs/min of conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 50 ℃, to react 70 minutes, 2.5% the rafifinal deironing 30 minutes that adds again calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this liquid poly aluminium chloride, at hot blast temperature, it is 300 ℃, tail air temperature is at 110 ℃, to spray to be dried, obtain the powdery iron-free poly aluminium chloride that 3620g quality of alumina content is 33%, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.
embodiment 3:
High whiteness calcium aluminate is prepared the method for powdery iron-free poly aluminium chloride, comprises following raw material and preparation process:
(1) aluminium hydroxide that is, 65% by 1000g quality of alumina content and calcium carbonate mass content 99%, the pre-burning at 950 ℃ of temperature of the calcite in powder of whiteness 91% naturally cooled to normal temperature after 3 hours, then worn into respectively 120 order powders, obtained the activated aluminum oxide 650g of tool and 550g calcium oxide powder;
(2), getting aluminum oxide powder 580g, the calcium oxide powder 320g of step (1) gained and coal dust 100g that calorific value is 7100kcal/kg mixes, add appropriate clear water stirring and make spherule, through the temperature of 1300 ℃, calcine 4 hours again, after naturally cooling to normal temperature, wear into 180 order powders, obtain quality of alumina content and be 64.5% high whiteness calcium aluminate powder 900g;
(3), in the iron-free aluminum chloride liquid that is 8.0% at 7300g quality of alumina mark, low whipping speed is under 200 revs/min of conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 100 ℃, to react 60 minutes, 3.0% the rafifinal deironing 30 minutes that adds again calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this liquid poly aluminium chloride, at hot blast temperature, it is 290 ℃, tail air temperature is at 105 ℃, to spray to be dried, obtain the powdery iron-free poly aluminium chloride that 3750g quality of alumina content is 31%, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.
embodiment 4:
High whiteness calcium aluminate is prepared the method for powdery iron-free poly aluminium chloride, comprises following raw material and preparation process:
(1) aluminium hydroxide that is, 64.5% by 1000g quality of alumina content and 1000g calcium carbonate mass content 98.5%, the pre-burning at 900 ℃ of temperature of the calcite in powder of whiteness 91% naturally cooled to normal temperature after 4 hours, then worn into respectively 120 order powders, obtained the activated aluminum oxide 645g of tool and 550g calcium oxide powder;
(2), getting aluminum oxide powder 560g, the calcium oxide powder 340g of step (1) gained and coal dust 100g that calorific value is 7100kcal/kg mixes, add appropriate clear water stirring and make spherule, through the temperature of 1250 ℃, calcine 5 hours again, after naturally cooling to normal temperature, wear into 150 order powders, obtain quality of alumina content and be 62% high whiteness calcium aluminate powder 900g;
(3), in the iron-free aluminum chloride liquid that is 7.0% at 8000g quality of alumina mark, low whipping speed is under 180 revs/min of conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 80 ℃, to react 80 minutes, 2.0% the rafifinal deironing 45 minutes that adds again calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this liquid poly aluminium chloride, at hot blast temperature, it is 280 ℃, tail air temperature is at 100 ℃, to spray to be dried, obtain the powdery iron-free poly aluminium chloride that 3880g quality of alumina content is 29%, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.
embodiment 5:
High whiteness calcium aluminate is prepared the method for powdery iron-free poly aluminium chloride, comprises following raw material and preparation process:
(1) aluminium hydroxide that is, 64.5% by 10t quality of alumina content and 10t calcium carbonate mass content 98.5%, the pre-burning at 900 ℃ of temperature of the calcite in powder of whiteness 91% naturally cooled to normal temperature after 4 hours, then worn into respectively 120 order powders, obtained the activated aluminum oxide 6.45t of tool and 5.5t calcium oxide powder;
(2), getting aluminum oxide powder 5.6t, the calcium oxide powder 3.4t of step (1) gained and coal dust 1t that calorific value is 7100kcal/kg mixes, add appropriate clear water stirring and make spherule, through the temperature of 1250 ℃, calcine 5 hours again, after naturally cooling to normal temperature, wear into 150 order powders, obtain quality of alumina content and be 62% high whiteness calcium aluminate powder 9t;
(3), in the iron-free aluminum chloride liquid that is 7.0% at 80t quality of alumina mark, low whipping speed is under 180 revs/min of conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 80 ℃, to react 80 minutes, the rafifinal deironing 45 minutes that adds again 1.0 % of calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this liquid poly aluminium chloride, at hot blast temperature, it is 280 ℃, tail air temperature is at 105 ℃, to spray to be dried, obtain the powdery iron-free poly aluminium chloride that 38.0t quality of alumina content is 30%, other quality index of this product be up to state standards < < Drinking Water with poly aluminium chloride > > (GB15892-2009) requirement.
Claims (1)
1. high whiteness calcium aluminate is prepared a method for powdery iron-free poly aluminium chloride, it is characterized in that: comprise following raw material and preparation process:
(1) aluminium hydroxide that is, 64%～65% by quality of alumina content and calcium carbonate mass content are greater than 98%, whiteness is greater than calcite in powder pre-burning at 850 ℃～950 ℃ temperature of 90% and naturally cools to normal temperature after 3 hours～5 hours, then worn into respectively 80 order～120 order powders, obtained the activated aluminum oxide powder of tool and calcium oxide powder;
(2) by aluminum oxide powder, calcium oxide powder and the calorific value of step (1) gained, be, that more than 7000kcal/kg coal dust is 55%～60%, 30%～35% and 10% to mix by massfraction respectively, add appropriate clear water stirring and make spherule, through the temperature of 1200 ℃～1300 ℃, calcine 4 hours～6 hours again, after naturally cooling to normal temperature, wear into 100 order～180 order powders, obtain quality of alumina content and be 60%～65% high whiteness calcium aluminate powder;
(3), in the iron-free aluminum chloride liquid that is 5.0%～10.0% at quality of alumina mark, low whipping speed is under 120 revs/min～200 revs/min conditions, to add the calcium aluminate powder of step (2) gained, then in temperature, be at 25 ℃～100 ℃, to react 60 minutes～90 minutes, 1.0%～3.0% the rafifinal deironing 30 minutes～60 minutes that adds again calcium aluminate massfraction after reaction, after filtration, obtain iron-free poly aluminium chloride liquid, by this poly aluminium chloride liquid, at hot blast temperature, it is 280 ℃～300 ℃, tail air temperature is at 100 ℃～110 ℃, to spray to be dried, obtain quality of alumina content and be 29%～33% powdery iron-free poly aluminium chloride.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104828849A (en) * | 2015-04-24 | 2015-08-12 | 长沙理工大学 | Method for preparing high-whiteness polyaluminium chloride from diaspore |
| CN113461349A (en) * | 2021-07-23 | 2021-10-01 | 深圳市市政工程总公司 | Preparation method of sludge dewatering curing agent |
| CN116040670A (en) * | 2023-03-31 | 2023-05-02 | 内蒙古蒙泰集团有限公司 | Method for producing polyaluminum chloride in process of preparing aluminum silicon oxide from fly ash |
| CN116040670B (en) * | 2023-03-31 | 2023-08-08 | 内蒙古蒙泰集团有限公司 | Method for producing polyaluminum chloride in process of preparing aluminum silicon oxide from fly ash |
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