A clarification method for clay sewage based on high iron fly ash
A technology of fly ash and clay, which is applied in the field of flocculation and settlement of clay sewage, can solve the problems of unfavorable clarified water recycling, increased water viscosity, water pollution, etc., and achieve good environmental benefits, fast flocculation and settlement, and low cost Effect
Active Publication Date: 2019-09-20
ANHUI UNIV OF SCI & TECH
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Problems solved by technology
Using the traditional flocculation and sedimentation method to treat clay sewage requires a large amount of chemical flocculants and coagulants. On the one hand, the cost is high and the process is complicated. On the other hand, the water body is polluted due to the residue of chemicals; Larger polymer materials, large doses and multiple additions will increase the viscosity of the water body, which is not conducive to the recycling of clarified water
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Embodiment 1
[0027] 1. Selection, ball milling and pretreatment of high-speed iron fly ash
[0028] First pass the fly ash through a 200-mesh sieve, and then use a magnetic separator to magnetically separate the fly ash to obtain high-iron fly ash with an iron grade of about 42.11%. The high-iron fly ash is ball milled under the condition of filling nitrogen, and then the particles with a particle size > 13 μm are removed by a dense medium cyclone, and finally magnetic separation is performed in a weak magnetic field again to obtain the final high-iron micro-particles. figure 1 It is a scanning electron microscope (figure a) and an electron energy dispersive spectrum (figure b) of high-iron microparticles, with an iron grade of about 56.2%, an average particle size of 5.1 μm, a specific saturation magnetization of 28.4emu / g, and a maximum particle size of < 13 μm.
[0029] Put 10g of ferric microparticles in 200mL of 0.1mol / L dilute hydrochloric acid for 2 minutes, use NdFeB permanent mag...
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Abstract
The invention discloses a method for clarifying clay type sewage on the basis of high-iron fly ash and belongs to the field of resource recycling and environmental protection. The method is characterized in that the high-iron fly ash is subjected to ball milling, magnetic separation and screening treatment, high-iron microparticles with the maximum particle size smaller than or equal to 13 mu m and the iron grade higher than or equal to 52% are obtained, and surfaces of the high-iron microparticles are subjected to ultrasonic cleaning treatment with weak acid; the pH value of the clay type sewage is adjusted to 4-5; the high-iron microparticles are added to the sewage and stirred for 2-4 min, and clay particles in the sewage can be rapidly flocculated and settled; the high-iron micoparticles in formed tailing sludge can be recycled through magnetic separation. By means of the method, the high-turibidity clay type sewage can be rapidly and effectively treated, no chemical flocculant or coagulant is added, and the method is environment-friendly; besides, the used high-iron microparticles can be recycled through magnetic separation; the high-iron fly ash is taken as a flocculant, the cost is low, resource recycling of waste is realized, and higher economic and environmental benefits are realized.
Description
technical field [0001] The invention relates to a method for flocculation and settlement of sewage, in particular to a method for realizing flocculation and settlement of clay sewage by adjusting the pH value of sewage and using high-iron fly ash. Background technique [0002] Mineral resources are the material basis for industrial development, and rapid economic and social development requires the exploitation of a large amount of mineral resources. Most minerals come from underground deposits, and associated minerals such as clay are mined out at the same time. These associated minerals form highly muddy clay-like sewage during ore cleaning and purification. For example, a large amount of slime water is formed in the coal preparation industry, and the high muddy clay particles are the main reason why the slime water is difficult to clarify. The production process of inorganic non-metallic industry also produces a large amount of clay sewage, such as the sewage produced by...
Claims
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IPC IPC(8): C02F1/52C02F1/48
Inventor 李建军乔尚元张丽亭余海洋朱金波金涛涛但宏兵
Owner ANHUI UNIV OF SCI & TECH