A method for developing solid high-efficiency flocculant using fly ash as raw material
A technology of fly ash and flocculant, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, inorganic chemistry, etc. Effect
Inactive Publication Date: 2017-01-25
INNER MONGOLIA UNIVERSITY
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However, so far, various synthetic and preparation methods have been tried in various technical fields at home and abroad, but it is impossible to obtain high-concentration, high-Al alloys with industrial application value. 13 content of polyaluminum solution and high-purity aluminum thirteen solid product
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[0059] The present invention is further explained below in conjunction with the examples, but the present invention is not limited in any form.
[0060] 1. High-temperature solid phase reaction: Grind and mix the fly ash and sodium carbonate of Hohhot Power Plant in a mortar at a mass ratio of 1.2:1, and roast them in a muffle furnace at 860°C for 90 minutes. After the clinker is cooled to room temperature, it is fully ground for later use. (fly ash Al 2 o 3 Content is 49.2%)
[0061] 2. Acid leaching reaction: Take 75.2g of the above-mentioned clinker in a beaker, add 380mL concentrated hydrochloric acid and 30mL distilled water, after fully stirring, let it stand at room temperature for 5min, and filter to obtain the acid leaching solution (at this time, the extraction rate of aluminum can reach 95.7% ).
[0062] 3. Preparation of AlO(OH): (a) Purification: ①Take the above pickling solution, adjust the pH value to 5 with 8mol / L sodium hydroxide solution, obtain hydroxide...
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The invention discloses a method for preparing a solid-state efficient flocculant by using coal ash as a raw material. By using the coal ash as the raw material, solid-state efficient flocculant aluminum polychloride [Al13(OH)24(H2O)24C115.13H2O] (short for P-Al13) crystal is prepared through an intermediate product AlO(OH). The method comprises the following steps: enabling the aluminum form in the coal ash into acidic leaching liquid through high-temperature solid phase reaction and acid leaching reaction; then preparing AlO(OH) by a NaOH direct precipitation method or a method of firstly preparing sodium metaaluminate and then regulating the pH value by adding hydrochloric acid; carrying out hydrolysis-polymerization reaction on AlO(OH) and hydrochloric acid at 90 DEG C above and normal pressure condition to a certain degree of alkalization; crystallizing naturally at low temperature to separate out P-Al13 product; and combining the remained mother liquor and acidic leaching liquid for recycling to realize zero discharge. By the method, the loss ratio of aluminum ion is low, the conversion rate of P-Al13 is high and high-valued comprehensive utilization of coal ash is realized. The prepared solid product P-Al13 has a superior flocculation effect compared with Keggin-Al13([AlO4Al12(OH)24(H2O)12]<7+>), and conforms to the specification of a superior product of national standard (GB15892-2009).
Description
technical field [0001] The invention relates to a method for comprehensive utilization of fly ash and a solid high-purity polyaluminum chloride flocculant, in particular to a method for developing a solid high-efficiency flocculant using fly ash as a raw material. Background technique [0002] my country's electricity is mainly coal-fired. Fly ash is a solid waste discharged from the flue after coal is burned in a combustion boiler. Its main chemical composition is Al 2 o 3 、Si 2 O. Therefore, if the main components in fly ash are utilized, it can not only alleviate the problems of land occupation and environmental pollution caused by fly ash, but also become a cheap renewable resource, partially satisfying the market's demand for Al 2 o 3 , SiO 2 Not only can it save the mining and transportation process of bauxite resources, but also reduce the production cost. [0003] At present, there are two main ways to utilize fly ash: (1) Utilize some characteristics of fly as...
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IPC IPC(8): C01F7/00C02F1/52
CPCC01F7/00C01P2002/72C02F1/5245
Inventor 王晖孙忠红艳温龙英
Owner INNER MONGOLIA UNIVERSITY