A kind of inorganic composite coagulant and its preparation method and application
An inorganic composite and coagulant technology, which is used in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., which can solve the problem of no clear report on the removal effect of pollutants and low phosphorus removal efficiency. And other issues
Active Publication Date: 2021-05-07
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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However, this method has low phosphorus removal efficiency and can only be used as an auxiliary additive
[0004] For another example, the publication number is CN 101979331 A Chinese patent document "a coagulant conforming to ferrosilicon calcium coagulant synthesized by steel slag", after mixing the acetic acid filtrate, hydrochloric acid filtrate and sodium hydroxide filtrate of steel slag, add stabilizer, after aging Ferrosilicon-calcium coagulant was obtained, but the removal effect of the coagulant on pollutants was not clearly reported
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[0019] The specific embodiment of the present invention proposes a kind of preparation method of inorganic composite coagulant, with reference to figure 1 , the preparation method comprises the following steps S1 to S5:
[0020] S1. Prepare steel slag, alumina powder and activated carbon as raw materials, and pretreat the steel slag to obtain steel slag powder.
[0021] In a preferred embodiment, the pretreatment includes: crushing the steel slag first, grinding it into powder, then activating it at a constant temperature at 400-800° C. for 1-4 hours, and obtaining the steel slag powder after cooling. The alumina used here can be wastes rich in alumina such as coal gangue, fly ash and / or red mud, for example. Of course, other forms of alumina powder are also possible, and the present invention is not limited thereto.
[0022] S2. Taking the steel slag powder and the alumina powder respectively according to the mass ratio of 1-4:1, and then mixing them with hydrochloric acid ...
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The invention discloses an inorganic composite coagulant and its preparation method and application. The preparation method comprises: S1, preparing raw material steel slag, alumina powder and activated carbon, and pretreating the steel slag to obtain steel slag powder; S2, according to the quality Take steel slag powder and alumina powder at a ratio of 1 to 4:1, mix them with hydrochloric acid with a concentration of 20 to 31%, and add sodium chlorate for polymerization; S3, filter the reactant obtained in step S2 to obtain the above Supernatant and sediment; S4, adding activated carbon into the supernatant and stirring to modify the activated carbon, wherein the mass ratio of the added activated carbon to the steel slag powder used in step S2 is 1:2-6; S5. Concentrating and drying the solution obtained in step S4 to obtain the inorganic composite coagulant. The effective components of the inorganic composite coagulant include modified activated carbon and polyaluminum ferric chloride, which can be used to treat sewage and effectively remove heavy metal ions and organic pollutants therein.
Description
technical field [0001] The invention relates to the field of environmental protection and resource regeneration, in particular to a novel inorganic composite coagulant prepared from steel slag, alumina and activated carbon as raw materials, a preparation method and application thereof. Background technique [0002] Steel slag is a by-product of the steelmaking process, accounting for about 12-20% of crude steel production. According to statistics, in 2013, my country's steel slag production was about 100 million tons, and the national steel slag stockpile has reached about 1 billion tons. Due to the influence of various factors such as concept and technology, the comprehensive utilization rate of steel slag in my country is only 10%. In recent years, the waste resource utilization of steel slag has attracted much attention. It is mainly used as sinter flux, road construction materials or cement, concrete admixture and building materials. Because steel slag contains a consi...
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IPC IPC(8): C02F1/52C02F1/28C02F101/20C02F101/30
CPCC02F1/281C02F1/283C02F1/5236C02F2101/20C02F2101/30
Inventor 王江李红艳孙乐群吴国钟
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV