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Method for preparing polyaluminum ferric sulfate by acid self-coupling equilibrium quasi-dry method

A polyaluminum ferric sulfate, acid self-coupling balance technology, applied in the direction of ferric sulfate, chemical instruments and methods, special compound water treatment, etc., can solve the problem of increasing the consumption of materials and energy in the production process, unfavorable storage and long-distance transportation, increasing Problems such as the difficulty of process control, etc., to achieve the effect of easy process control, convenient transportation and storage, and reduced production costs

Inactive Publication Date: 2018-07-06
徐颖惠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, if the acidity is too strong in these preparation processes, the polymerization will not be complete; if the acidity is too weak, segregation will easily occur and insoluble substances will be produced. Stability, not only increases the difficulty of process control, but also affects product quality, increases the consumption of materials and energy in the production process, and is not conducive to clean production
[0004] In order to make the preparation process simple and easy to control, and improve the atom economy and cleanliness of the preparation process, I once proposed a new method for preparing polyaluminum ferric sulfate by acid self-coupling equilibrium liquid phase method, but the obtained product is also liquid and not Good for storage and long-distance transportation

Method used

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  • Method for preparing polyaluminum ferric sulfate by acid self-coupling equilibrium quasi-dry method
  • Method for preparing polyaluminum ferric sulfate by acid self-coupling equilibrium quasi-dry method
  • Method for preparing polyaluminum ferric sulfate by acid self-coupling equilibrium quasi-dry method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1 experimental equipment

[0014] Glass beaker (50mL 100mL 200mL 500mL 1000mL), electric magnetic stirrer, digital display electric heating constant temperature water bath, PH-2 acidity meter, density meter (scale value is 0.001g / cm 3 ), graduated cylinders, burettes, triangular flasks, etc.

[0015] 2 experimental drugs

[0016] Ferrous sulfate heptahydrate (analytical pure), ferric sulfate, sodium chlorate, aluminum sulfate octadecadecahydrate (analytical pure), distilled water, disodium edetate, ZnO, hexamethylenetetramine, phenolphthalein, concentrated hydrochloric acid , Xylenol Orange, A.R Pure Sulfosalicylic Acid, Anhydrous Sodium Sulfate, Potassium Fluoride, Potassium Hydrogen Phthalate, 95% Ethanol, NaOH.

[0017] 3 Experimental methods

[0018] 3.1 Preparation method

[0019] Weigh a certain amount of sodium chlorate and place it in a mortar, add a specified amount of distilled water to dissolve it, then add solid ferrous sulfate heptahydrate and aluminum ...

Embodiment 2

[0029] Embodiment 2: Preparation during different oxidizing agent consumptions

[0030] According to the preparation conditions of Example 1, the amount of oxidant was changed and the grinding reaction was carried out for 50 minutes. The results are listed in Table 2.

[0031] Table 2 Products prepared with different oxidant dosages

[0032]

[0033] The data in table 2 shows that because the reaction material is relatively dry, it is the oxygen in the air that participates in Fe 2+ Oxidation provides the possibility, so Fe 2+ Higher oxidation rates can also be achieved. Generally speaking, but to ensure that Fe 2+ Oxidation is complete, and the dosage of oxidant is still advisable with an excess of 4%.

Embodiment 3

[0034] Embodiment 3: Preparation during different reaction temperatures

[0035] According to the preparation conditions of Example 2, the dosage of the oxidant was 4% in excess, and the results prepared at different reaction temperatures are listed in Table 3.

[0036] Table 3 Preparation at different reaction temperatures

[0037]

[0038] As can be seen from the data in Table 3, the reaction is not very demanding on the temperature, and the Fe content of the product between room temperature and 60 ° C 2+ The two indicators of conversion rate and salinity can reach ideal values. However, the temperature can significantly affect the progress of aluminum-iron hydrolysis and polymerization. Considering the effects of multiple factors such as oxidation, hydrolysis, polymerization, and segregation of aluminum and iron in the reaction, the reaction temperature is preferably 50 to 60°C.

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Abstract

The invention discloses a method for preparing PAFS (polymeric aluminum ferric sulfate) by adopting an acid self-coupling balance and near-dry method. According to the method, Al2(SO4)3*18H2O, FeSO4*7H2O and NaClO3 are taken as raw materials, the acid self-coupling balance and near-dry method is adopted to prepare the PAFS. The preparation conditions are as follows: the ratio of n(Al<3+>) / n(Fw<2+>) is 2.0, the temperature is 60 DEG C, the reaction time is 50 min, the oxidizing agent NaClO3 exceeds by 4% when accounted in terms of Fe<2+>, and the PAFS is prepared. The quality of the PAFS product meets the national standard requirement, the ferrous conversion rate of the product is reduced by 0.17% when the product is stored at the room temperature for 3 months, the basicity is reduced by 1.02%, the precipitation amount is increased by 2.78%, but all the indexes still meet the national standard requirements, accordingly, the indexes of the product are more stable, and the storage effect is better.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for preparing polyaluminum ferric sulfate by an acid self-equilibrium quasi-dry method. Background technique [0002] Inorganic polymer coagulant is a new type of coagulant developed after the 1960s. It has the advantages of non-toxicity and low price, thus replacing organic polymer coagulant. It is widely used in water supply, industrial wastewater and urban sewage various processes. At present, the commonly used inorganic polymer flocculants mainly include polyaluminum chloride (PAC) and polyferric sulfate (PFS). Among them, polyaluminum chloride has the advantages of small residual chroma, but weak hydrolysis, small flocculation volume, looseness, slow sedimentation and Al 3+ Residues, etc., are not conducive to the application in water treatment. Polyferric sulfate has stable product performance and does not contain Al 3+ And heavy metals and other h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C01G49/14
CPCC01G49/14C02F1/5236C02F2305/04
Inventor 徐颖惠林维晟胡家朋
Owner 徐颖惠