CN111252793A - Preparation method of polyaluminum chloride - Google Patents
Preparation method of polyaluminum chloride Download PDFInfo
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- CN111252793A CN111252793A CN202010248032.9A CN202010248032A CN111252793A CN 111252793 A CN111252793 A CN 111252793A CN 202010248032 A CN202010248032 A CN 202010248032A CN 111252793 A CN111252793 A CN 111252793A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/56—Chlorides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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Abstract
The invention relates to the technical field of preparation of inorganic high-molecular coagulants, in particular to a preparation method of polyaluminium chloride. The method comprises the steps of selecting bauxite, high-calcium stone and anthracite as raw materials, crushing the raw materials, mixing and grinding the raw materials to obtain a mixed material, balling the mixed material, and then putting the mixed material into a high-temperature area of a rotary furnace for calcining; the calcination temperature in the rotary furnace is at least 1350 ℃; the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, wherein when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace; and (3) carrying out polymerization reaction on the calcined material and hydrochloric acid to obtain a yellow liquid-polyaluminum chloride solution, wherein in the process, the activated carbon adsorbs the color in the yellow liquid-polyaluminum chloride solution to obtain a white liquid-polyaluminum chloride solution. The invention reduces the environmental pollution and the production cost of enterprises, and simultaneously, the produced polyaluminium chloride is white.
Description
Technical Field
The invention relates to the technical field of preparation of inorganic high-molecular coagulants, in particular to a preparation method of polyaluminium chloride.
Background
Polyaluminium chloride is a water purifying material, an inorganic polymer coagulant, also called polyaluminium for short, and is called PAC for short, and is an inorganic polymer water treatment agent with large molecular weight and high charge, which is produced by the bridging action of hydroxide ions and the polymerization action of polyvalent anions. The shape of the product can be divided into solid and liquid. The solid is divided into dark brown, beige, golden yellow and white according to different colors, and the liquid can be colorless and transparent, yellowish, light yellow to yellow brown. The polyaluminium chlorides with different colors also have great difference in application and production technology.
The existing preparation method of polyaluminium chloride adopts raw material grinding, calcining, hollow kiln calcining, finished product grinding, packaging and delivery, wherein the calcining is external combustion (the calcining temperature is 1450 ℃), hydroxide is up to more than 60% at high temperature, sulfur dioxide also exceeds standard, if the generated sulfur dioxide is not treated, air pollution is caused, if the generated sulfur dioxide is treated, enterprise cost is increased, and in the external combustion calcining process, because the generated sulfur dioxide is directly contacted with air, oxygen is sufficient, active carbon cannot be generated, calcium aluminate powder is polymerized with hydrochloric acid, and dissolved liquid is yellow.
Disclosure of Invention
The invention aims to provide a preparation method of white polyaluminium chloride, which reduces the environmental pollution and the production cost of enterprises.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a preparation method of polyaluminium chloride comprises the following steps:
step one, selecting bauxite, high-calcium stone and anthracite as raw materials, crushing the raw materials, mixing and grinding the raw materials to obtain a mixed material, balling the mixed material, and then putting the mixed material into a high-temperature area of a rotary furnace for calcining; the calcination temperature in the rotary furnace is at least 1350 ℃; the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, wherein when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace;
and step two, carrying out polymerization reaction on the calcined material in the step one and hydrochloric acid to obtain a yellow liquid-polyaluminum chloride solution, and adsorbing the color in the yellow liquid-polyaluminum chloride solution by using activated carbon in the process to obtain a white liquid-polyaluminum chloride solution.
Preferably, the calcination process is as follows: the mixed material is subjected to physical and chemical reactions during calcination, simultaneously sinks, and is set in an anoxic state after the mixed material sinks to a high-temperature region, so that activated carbon is generated by the anthracite which is not completely burned in the mixed material in the anoxic high-temperature process.
Preferably, in the first step, Al in the bauxite2O3Is not less than 50%.
Preferably, in the first step, the mass fraction of CaO in the hypercalcite is not less than 80%.
Preferably, in the first step, the mass fraction of C in the anthracite coal is not less than 90%.
Preferably, the white liquid-polyaluminium chloride solution obtained in the second step is dried to obtain a white-polyaluminium chloride solid.
Preferably, the white-polyaluminum chloride solid is crushed to obtain white powder-polyaluminum chloride.
Compared with the prior art, the invention has the beneficial effects that:
the raw materials are ground and then are put into the rotary furnace to be calcined, the raw materials enter the rotary furnace to be internally combusted, the rotary furnace comprises a calcination area, a high-temperature area and a mixed material area, when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace; furthermore, because part of anthracite is converted into activated carbon due to insufficient oxygen during calcination in the rotary furnace, when the calcined mixed material is polymerized with hydrochloric acid, the color of the solution in the yellow liquid-polyaluminium chloride solution produced in the polymerization reaction can be adsorbed due to strong adsorbability of the activated carbon, so that the white liquid-polyaluminium chloride solution is obtained.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1: a preparation method of polyaluminium chloride comprises the following steps:
step one, selecting bauxite, high-calcium stone and anthracite as raw materials, crushing the raw materials, mixing and grinding the raw materials to obtain a mixed material, balling the mixed material, and then putting the mixed material into a high-temperature area of a rotary furnace for calcining; the calcination temperature in the rotary furnace is at least 1350 ℃; the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, wherein when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace; the calcining process comprises the following steps: the mixed material is subjected to physical and chemical reactions during calcination, simultaneously sinks, and is set in an anoxic state after the mixed material sinks to a high-temperature region, so that activated carbon is generated by the anthracite which is not completely burned in the mixed material in the anoxic high-temperature process.
And step two, carrying out polymerization reaction on the calcined material in the step one and hydrochloric acid to obtain a yellow liquid-polyaluminum chloride solution, and adsorbing the color in the yellow liquid-polyaluminum chloride solution by using activated carbon in the process to obtain a white liquid-polyaluminum chloride solution. In the first step, Al in the bauxite2O3Is 50 percent. In the first step, the mass fraction of CaO in the hypercalcite is 80%. In the first step, the mass fraction of C in the anthracite coal is 90%. And drying the white liquid-polyaluminium chloride solution obtained in the step two by adopting a drum dryer under the condition that saturated steam with the temperature of 160 ℃ and the pressure of 0.6MPa is introduced into the drum to obtain solid polyaluminium chloride and obtain white-polyaluminium chloride solid. And crushing the white-polyaluminium chloride solid to obtain white powder-polyaluminium chloride. Wherein, the polyaluminium chloride prepared by the preparation method of the polyaluminium chloride is white.
Example 2: a preparation method of polyaluminium chloride comprises the following steps:
step one, selecting bauxite, high-calcium stone and anthracite as raw materials, crushing the raw materials, mixing and grinding the raw materials to obtain a mixed material, balling the mixed material, and then putting the mixed material into a high-temperature area of a rotary furnace for calcining; the calcination temperature in the rotary furnace is at least 1400 ℃; the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, wherein when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace; the calcining process comprises the following steps: the mixed material is subjected to physical and chemical reactions during calcination, simultaneously sinks, and is set in an anoxic state after the mixed material sinks to a high-temperature region, so that activated carbon is generated by the anthracite which is not completely burned in the mixed material in the anoxic high-temperature process.
And step two, carrying out polymerization reaction on the calcined material in the step one and hydrochloric acid to obtain a yellow liquid-polyaluminum chloride solution, and adsorbing the color in the yellow liquid-polyaluminum chloride solution by using activated carbon in the process to obtain a white liquid-polyaluminum chloride solution. In the first step, Al in the bauxite2O3Is 55 percent. In the first step, the mass fraction of CaO in the hypercalcite is 82%. In the first step, the mass fraction of C in the anthracite coal is 91%. And drying the white liquid-polyaluminium chloride solution obtained in the step two by adopting a drum dryer under the condition that saturated steam with the temperature of 160 ℃ and the pressure of 0.6MPa is introduced into the drum to obtain solid polyaluminium chloride and obtain white-polyaluminium chloride solid. And crushing the white-polyaluminium chloride solid to obtain white powder-polyaluminium chloride. Wherein, the polyaluminium chloride prepared by the preparation method of the polyaluminium chloride is white.
Example 3: a preparation method of polyaluminium chloride comprises the following steps:
step one, selecting bauxite, high-calcium stone and anthracite as raw materials, crushing the raw materials, mixing and grinding the raw materials to obtain a mixed material, balling the mixed material, and then putting the mixed material into a high-temperature area of a rotary furnace for calcining; the calcination temperature in the rotary furnace is at least 1400 ℃; the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, wherein when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace; the calcining process comprises the following steps: the mixed material is subjected to physical and chemical reactions during calcination, simultaneously sinks, and is set in an anoxic state after the mixed material sinks to a high-temperature region, so that activated carbon is generated by the anthracite which is not completely burned in the mixed material in the anoxic high-temperature process.
And step two, carrying out polymerization reaction on the calcined material in the step one and hydrochloric acid to obtain a yellow liquid-polyaluminum chloride solution, and adsorbing the color in the yellow liquid-polyaluminum chloride solution by using activated carbon in the process to obtain a white liquid-polyaluminum chloride solution. In the first step, Al in the bauxite2O3Is 60 percent. In the first step, the mass fraction of CaO in the hypercalcite is 85%. In the first step, the mass fraction of C in the anthracite coal is 92%. And drying the white liquid-polyaluminium chloride solution obtained in the step two by adopting a drum dryer under the condition that saturated steam with the temperature of 160 ℃ and the pressure of 0.6MPa is introduced into the drum to obtain solid polyaluminium chloride and obtain white-polyaluminium chloride solid. And crushing the white-polyaluminium chloride solid to obtain white powder-polyaluminium chloride. Wherein, the polyaluminium chloride prepared by the preparation method of the polyaluminium chloride is white.
The polyaluminium chloride prepared by the method has the following advantages: because the raw materials are ground and then are put into the rotary furnace to be calcined, the raw materials enter the rotary furnace to be internally combusted, the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace, because the temperature in the rotary furnace is at least 1350 ℃, the high-temperature area is not contacted with air in the middle of the rotary furnace, hydroxide is not basically generated (namely the hydroxide is produced less), and a large amount of high calcium carbonate (CaO) in the raw materials is pressed on the upper part of the combustion area, so the process that the flue gas containing sulfur content passes through the raw materials and is neutralized with the CaO, the emission of sulfur dioxide is greatly reduced, and the purposes of energy conservation; furthermore, because part of anthracite is converted into activated carbon due to insufficient oxygen during calcination in the rotary furnace, when the calcined mixed material is polymerized with hydrochloric acid, the color of the solution in the yellow liquid-polyaluminium chloride solution produced in the polymerization reaction can be adsorbed due to strong adsorbability of the activated carbon, so that the white liquid-polyaluminium chloride solution is obtained. Compared with the existing enterprises, the white polyaluminium chloride can be obtained and is connected with the international water purifying agent.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (7)
1. The preparation method of the polyaluminium chloride is characterized by comprising the following steps:
step one, selecting bauxite, high-calcium stone and anthracite as raw materials, crushing the raw materials, mixing and grinding the raw materials to obtain a mixed material, balling the mixed material, and then putting the mixed material into a high-temperature area of a rotary furnace for calcining; the calcination temperature in the rotary furnace is at least 1350 ℃; the rotary furnace comprises a calcining area, a high-temperature area and a mixed material area, wherein when the mixed material enters the high-temperature area, part of anthracite is burnt out, and the activated carbon is produced under the condition of insufficient oxygen in the rotary furnace;
and step two, carrying out polymerization reaction on the calcined material in the step one and hydrochloric acid to obtain a yellow liquid-polyaluminum chloride solution, and adsorbing the color in the yellow liquid-polyaluminum chloride solution by using activated carbon in the process to obtain a white liquid-polyaluminum chloride solution.
2. The method for preparing polyaluminum chloride according to claim 1, wherein: the calcining process comprises the following steps: the mixed material is subjected to physical and chemical reactions during calcination, simultaneously sinks, and is set in an anoxic state after the mixed material sinks to a high-temperature region, so that activated carbon is generated by the anthracite which is not completely burned in the mixed material in the anoxic high-temperature process.
3. The method for preparing polyaluminum chloride according to claim 1, wherein: in the first step, Al in the bauxite2O3Is not in mass fractionLess than 50%.
4. The method for preparing polyaluminum chloride according to claim 1, wherein: in the first step, the mass fraction of CaO in the hypercalcite is not less than 80%.
5. The method for preparing polyaluminum chloride according to claim 1, wherein: in the first step, the mass fraction of C in the anthracite coal is not less than 90%.
6. The method for preparing polyaluminum chloride according to claim 1, wherein: and drying the white liquid-polyaluminum chloride solution obtained in the step two to obtain a white-polyaluminum chloride solid.
7. The method for preparing polyaluminum chloride according to claim 6, wherein: and crushing the white-polyaluminium chloride solid to obtain white powder-polyaluminium chloride.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087001A (en) * | 2021-03-01 | 2021-07-09 | 江苏蓝遥净水剂有限公司 | Device and method for preparing polyaluminum chloride liquid from environment-friendly metal aluminum |
| CN113828014A (en) * | 2021-09-14 | 2021-12-24 | 海南金海浆纸业有限公司 | Purification and decoloration process of polyaluminium chloride solution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113828014A (en) * | 2021-09-14 | 2021-12-24 | 海南金海浆纸业有限公司 | Purification and decoloration process of polyaluminium chloride solution |
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