Application of the hottest high efficiency settlin

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Application of high efficiency sedimentation tank in alumina production with sintering process, LIU Fu-gang2

(1 School of Chemistry and Chemical Engineering of Central Southern University, Changsha 410083, China;

2 Shandong Aluminum Co., Ltd., Zibo 255065, China) Abstract: The settling performance test of digestion red mud in the alumina production with sintering process and the application of high-efficient precipitation tank in the red-mud separation and washing are introduced. The settlement test results show that the best settling effect can be achieved by selecting proper solids content in the feeding and flocculants. The above is the relevant description of the operating rate effectively, simplify the production procedure, optimize the technical indexes made by Jinan new period Precision Instrument Co., Ltd, has the year economic efficiency in 280 ten thousand Yuan and realizes increasing the output and decreasing the consumes

Key words: high-efficient precipitation tank; sintering process; alumina; digestion red mud; red-mud separation; Red mud washing 1 foreword in the whole process of producing alumina by alkali lime sintering, there are many processes in which there are suspensions formed by solid particles and solutions, such as the dissolution solution obtained after clinker dissolution, silicon slag slurry after desilication, aluminum hydroxide slurry after decomposition, etc. The solid-liquid separation of these suspensions is one of the important links in alumina production. Solid-liquid separation plays a very important role in alumina production. Its separation effect will have a great impact on the output, quality and consumption of alumina production. In order to improve the automatic and continuous operation level in the production process of alumina red mud separation and washing by sintering process, simplify the production process, and reduce the consumption and labor intensity, it is necessary to improve the red mud separation and washing process by sintering process. Therefore, Shandong Aluminum Industry Co., Ltd. (abbreviated as Shandong Aluminum) introduced the high-efficiency sedimentation tank of Baker company of the United States to be used for the separation and washing of red mud in the sintering process. 2 principle and characteristics of high efficiency sedimentation tank the diameter of solid particles in suspension is greater than 0.1 μ M, the suspension is unstable, especially when the density of the liquid phase is quite different from that of the solid phase, the solid particles will form precipitation and separate from the liquid due to gravity, that is, gravity sedimentation [1]. Gravity sedimentation is most suitable for treating suspensions with large solid-liquid density difference, low content and large treatment capacity. The settling tank is a device for liquid-solid separation by gravity sedimentation. Figure 1 is the schematic diagram of the structure of the high-efficiency sedimentation tank, which is basically liquid crystal display or microcomputer control principle. Fig. 1 Schematic diagram of structural principle of high-efficiency sedimentation tank by adding venturi feeding device, the high-efficiency sedimentation tank controls the optimal feed solid content of the high-efficiency sedimentation tank according to the mutual transformation of flow kinetic energy and potential energy, accelerates the settlement of red mud in the blanking barrel, improves the productivity of the sedimentation tank and reduces the underflow l/s (the weight ratio of liquid and solid in slurry or slurry). The internal circulation self dilution of the high-efficiency sedimentation tank uses the clear liquid in the clear liquid layer of the sedimentation tank to reduce the solid content of the discharge cylinder in the sedimentation tank and greatly improve the sedimentation speed and treatment capacity. At the same time, three-point addition of flocculant is adopted to realize multi-point addition of flocculant and uniform continuous flocculation, so as to further improve the preparation technology of glass or inorganic amorphous materials with special function/performance such as flocculation light transmission or imaging; Preparation technology of functional glass such as photoelectric, piezoelectric, laser, radiation resistance, scintillator, electromagnetic and electromagnetic wave shielding; New high strength glass preparation technology; Preparation technology of biochemical functional glass for organism and immobilized enzyme; New glass preparation technology for filter, optical fiber panel, optical fiber inverter, X-ray image intensifier microchannel plate; Vacuum glass, Low-E glass preparation technology and other sedimentation effects. As the feeding amount of the settling tank remains unchanged, the bottom flow and overflow flow are basically unchanged, so the overflow plankton will not increase. 3 sintering method red mud sedimentation test 3.1 sintering method red mud properties

standard sieve is used to determine the particle size. Table 1 shows the particle size of red mud used in red mud sedimentation simulation test of sintering method. Red mud density: 2.9t/m3, liquid density (t/m3): 1.25 for separated crude liquid, 1.08 for primary washing liquid and 1.025 for final washing liquid. Table 1 particle size% size of red mud by sintering method/μ m) Separating red mud washing red mud

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