Method for preparing solid polymeric aluminum ferric sulfate
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A technology of aluminum ferric sulfate, solid polymerization, applied in ferric sulfate, flocculation/sedimentation water/sewage treatment and other directions, can solve the problems of high production cost, limited content of aluminum components, single, etc., to achieve excellent effect and long service life. Effect
Inactive Publication Date: 2009-05-06
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology
Chinese patent CN94117429.8 proposes a production method using ferrous sulfate as a raw material and aluminum nitrate as a catalyst to prepare polyaluminum ferric sulfate, but aluminum nitrate is also used as an aluminum component in this method, so the aluminum component content in the product is limited; At the same time, pure oxygen is used as the oxidant, the reaction system requires high system pressure requirements, and the production cost is high; moreover, the product is in a liquid state, which is inconvenient for transportation and storage
CN01133248.4 also utilizes industrial waste residues to produce polyaluminum ferric sulfate. The basicity of the product is only 7-9%. Although it is a solid product, it is obtained by evaporation and dehydration of a liquid product. The process requires a lot of energy
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Embodiment 1
[0020] Put 1.25kg of ferrous sulfate containing crystal water in an oven, control the temperature at 80°C, dehydrate until the reactant turns into a white powder, then raise the temperature to 180°C and turn on the oven fan, and react for about 12 hours to obtain a brown solid powder, which is oxidized The rate is about 97-98%. Weigh directly 500g of the brown basic ferric sulfate powder and place it in the reaction kettle, then mix 200mL of water and 50mL of concentrated sulfuric acid and add it to the reaction kettle, then start the mixer, stir at a slow speed, and then press the oxidation rate of ferrous iron 30% hydrogen peroxide (mass percentage, 1 mL) was added, and stirring was continued to mix the components uniformly.
[0021] Let the reactant stand still for 1.5h, add 208mL of aluminum sulfate solution with a concentration of 1.5M, start the mixer to stir from slow to fast, and stir for a few minutes after all components are evenly mixed, that is, transfer the reacta...
Embodiment 2
[0029] The production method is the same as in Example 1, and the aluminum sulfate solution in the material is replaced with an alkalized aluminum solution, and the input volume is 467mL. The solidification and precipitation time is 3 days, and then after aging for 5 days, the product can be obtained by crushing.
[0030] The preparation method of alkalized aluminum solution is as follows: take 1L of 1.5M aluminum sulfate stock solution, add alkalization agent and stir rapidly to make the alkalization degree (B value) reach 1.2, and it can be used after standing for one day. run out.
[0031] Gained final polyaluminum ferric sulfate outward appearance and quality index are as follows:
[0032] Appearance: Yellow-brown powder, loose, soluble in water
[0033] Basicity: 28%
[0034] Active component: with [Al+Fe] a+b Total, 70-80%
[0035] Iron (Fe 3+ )%≥11.9; Aluminum (Al 2 o 3 )% ≥ 2.7.
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Abstract
The invention discloses a preparation method of solid polymeric ferroaluminum sulfate, comprising the following steps: (1) basic ferric sulfate is prepared from ferrous sulfate; (2) water, sulfuric acid and hydrogen peroxide are added into the basic ferric sulfate in sequence, stirring and standing; (3) an aluminized compound is added and further stirred; (4) being self-cured and precipitated under dry condition; and (5) being aged at room temperature and crushed so to obtain a product. The invention uses a blast oxidation process and solves the pollution problem which is generated by the catalytic oxidation process in the traditional iron-based coagulant industry. The polymeric ferroaluminum sulfate is a solid product; compared with the liquid product, the polymeric ferroaluminum sulfate has advantages of storage and transportation, has long service life, and does not need evaporation or decompression evaporation process, and the coagulation active component of the product is retained to the largest extent. Quality indicators such as basicity, active component, and the like are all higher than the quality indicators in the prior art. When in actual implementation and embodiment of water body, the effect of the polymeric ferroaluminum sulfate is better than the effect of the inorganic coagulant such as polyaluminum chloride polymeric ferroaluminum sulfate and the like.
Description
technical field [0001] The invention relates to a preparation process of solid polyaluminum ferric sulfate. Background technique [0002] The inorganic polymer coagulant industry began in Japan. In the 1960s and 1970s, Japan successively developed the production technology of polyaluminum chloride and polyferric sulfate. However, in practical application, it is found that the combination of polyaluminum and polyiron has more effective functions of removing turbidity, reducing COD and decolorizing than using a coagulant alone. In the late 1980s, some reports proposed the concept of polyaluminum ferric sulfate copolymerized with iron and aluminum, and reported its preparation scheme. Chinese patent CN94117429.8 proposes a production method using ferrous sulfate as a raw material and aluminum nitrate as a catalyst to prepare polyaluminum ferric sulfate, but aluminum nitrate is also used as an aluminum component in this method, so the aluminum component content in the product i...
Claims
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Application Information
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