A kind of preparation method and application of polysilicate ferric salt coagulant

Abstract

The invention relates to a preparation method and application of a polyferric silicate coagulant. According to the method, a ferrous salt and a specific functional metal salt are used as raw materials; the ferrous salt and the specific functional metal salt are dissolved in an inorganic acid solution, so as to prepare an acidic ferric salt solution; mixed liquor B is obtained by adding a stabilizer A of a weak acid, a weak alkali, a strong alkali-weak acid salt, a strong acid-weak alkali salt or a weak acid-weak alkali salt; the mixed liquor B is mixed and reacted with activated silicic acid into which a surfactant stabilizer C is added, so as to prepare and obtain the high-efficiency polyferric silicate coagulant. The coagulant can be used for the treatment of wastewater containing heavy oil. The preparation method is simple in process, low in cost and low in requirements on reaction equipment; the obtained coagulant can be widely used in the process of the treatment of the wastewater containing the heavy oil, and has the advantages of a good coagulation effect, a high oil removal rate, a quick reaction speed, a quick sedimentation rate and high COD (Chemical Oxygen Demand) removal rate and turbidity removal rate, high activity and the like; the treated wastewater containing oil completely meets requirements in the Integrated Wastewater Discharge Standard GB8978-96.

Description

technical field

[0001] The invention relates to the field of water treatment, in particular to a preparation method and application of polysilicate iron salt. Background technique

[0002] The indispensable pre-unit operation technology in the recycling of water resources, that is, the deep purification of water quality, is flocculation technology. For example, in urban water and industrial wastewater treatment processes, flocculation process is one of the most commonly used important unit processes. It determines the operating conditions of the subsequent process, the final water quality and cost, and thus becomes an important scientific and technological research and development field of water treatment engineering. The quality of its water treatment largely depends on the performance of the flocculant, which is the core of the flocculation water treatment technology. According to incomplete statistics, the annual demand for flocculants for industrial water, urban water s...

Examples

Embodiment 1

[0019] Embodiment 1: a kind of polysilicate ferric salt coagulant that is used for containing heavy oil waste water, adopts following steps to prepare:

[0020] (1) Add 20 g of ferrous sulfate into 30 mL of sulfuric acid solution with a concentration of 20% by volume, place it in a digital display constant temperature water bath, and stir at 60°C for 20 min to obtain an acidic ferrous salt solution. adding titanium sulfate to the acidic ferrous salt solution, and stirring at 60° C. for 20 min to obtain an acidic ferric salt solution; wherein, the molar ratio of the iron element in the ferrous sulfate to the titanium element in the titanium sulfate is 1:1;

[0021] (2) After step (1) is stirred, add oxidant m-chloroperoxybenzoic acid, wherein the molar ratio of iron element in ferrous sulfate to m-chloroperbenzoic acid is 100:1, continue stirring for 40 minutes, and add ammonia water to obtain Mixed solution, wherein the mol ratio of ammoniacal liquor and iron element in the fe...

Embodiment 2

[0024] Embodiment 2: a kind of polysilicate ferric salt coagulant that is used to contain heavy oil waste water, adopts following steps to prepare:

[0025] (1) Add 30 g of ferrous sulfate into 80 mL of sulfuric acid solution with a concentration of 10% by volume, place it in a digital display constant temperature water bath, and stir at 70°C for 15 min to obtain an acidic ferrous salt solution. adding zinc acetate to the acidic ferrous salt solution, and stirring at 70° C. for 15 min to obtain an acidic ferric salt solution; wherein, the molar ratio of the iron element in the ferrous sulfate to the zinc element in the zinc acetate is 100:50;

[0026] (2) After step (1) is stirred, add oxidant tert-butyl hydroperoxide, wherein the molar ratio of iron element in ferrous sulfate to tert-butyl hydroperoxide is 100:1, continue to stir for 50 minutes, add phosphoric acid and get mixed Solution; wherein the molar ratio of phosphoric acid to the iron element in the ferrous sulfate is...

Embodiment 3

[0029] Embodiment 3: a kind of polysilicate ferric salt coagulant for containing heavy oil waste water, adopts following steps to prepare:

[0030] (1) Add 40g of ferrous sulfate to 90mL of sulfuric acid solution with a concentration of 20% by volume, place it in a digital display constant temperature water bath, and stir at 70°C for 20 minutes to obtain an acidic ferrous salt solution. Magnesium acetate was added to the ferrous salt solution, and stirred at 70°C for 20 min to obtain an acidic ferric salt solution; wherein, the molar ratio of the iron element in the ferrous sulfate to the magnesium element in the magnesium acetate was 100:60;

[0031](2) After step (1) is stirred, add the oxidant cerium ammonium nitrate, wherein the molar ratio of the iron element in the ferrous sulfate to the cerium ammonium nitrate is 100:2, continue stirring for 40 minutes, and obtain a mixed solution after adding acetic acid; The molar ratio of iron element in the ferrous salt is 2.5:100; ...

technical field

[0001] The invention relates to the field of water treatment, in particular to a preparation method and application of polysilicate iron salt. Background technique

[0002] The indispensable pre-unit operation technology in the recycling of water resources, that is, the deep purification of water quality, is flocculation technology. For example, in urban water and industrial wastewater treatment processes, flocculation process is one of the most commonly used important unit processes. It determines the operating conditions of the subsequent process, the final water quality and cost, and thus becomes an important scientific and technological research and development field of water treatment engineering. The quality of its water treatment largely depends on the performance of the flocculant, which is the core of the flocculation water treatment technology. According to incomplete statistics, the annual demand for flocculants for industrial water, urban water s...

Examples

Embodiment 1

[0019] Embodiment 1: a kind of polysilicate ferric salt coagulant that is used for containing heavy oil waste water, adopts following steps to prepare:

[0020] (1) Add 20 g of ferrous sulfate into 30 mL of sulfuric acid solution with a concentration of 20% by volume, place it in a digital display constant temperature water bath, and stir at 60°C for 20 min to obtain an acidic ferrous salt solution. adding titanium sulfate to the acidic ferrous salt solution, and stirring at 60° C. for 20 min to obtain an acidic ferric salt solution; wherein, the molar ratio of the iron element in the ferrous sulfate to the titanium element in the titanium sulfate is 1:1;

[0021] (2) After step (1) is stirred, add oxidant m-chloroperoxybenzoic acid, wherein the molar ratio of iron element in ferrous sulfate to m-chloroperbenzoic acid is 100:1, continue stirring for 40 minutes, and add ammonia water to obtain Mixed solution, wherein the mol ratio of ammoniacal liquor and iron element in the fe...

Embodiment 2

[0024] Embodiment 2: a kind of polysilicate ferric salt coagulant that is used to contain heavy oil waste water, adopts following steps to prepare:

[0025] (1) Add 30 g of ferrous sulfate into 80 mL of sulfuric acid solution with a concentration of 10% by volume, place it in a digital display constant temperature water bath, and stir at 70°C for 15 min to obtain an acidic ferrous salt solution. adding zinc acetate to the acidic ferrous salt solution, and stirring at 70° C. for 15 min to obtain an acidic ferric salt solution; wherein, the molar ratio of the iron element in the ferrous sulfate to the zinc element in the zinc acetate is 100:50;

[0026] (2) After step (1) is stirred, add oxidant tert-butyl hydroperoxide, wherein the molar ratio of iron element in ferrous sulfate to tert-butyl hydroperoxide is 100:1, continue to stir for 50 minutes, add phosphoric acid and get mixed Solution; wherein the molar ratio of phosphoric acid to the iron element in the ferrous sulfate is...

Embodiment 3

[0029] Embodiment 3: a kind of polysilicate ferric salt coagulant for containing heavy oil waste water, adopts following steps to prepare:

[0030] (1) Add 40g of ferrous sulfate to 90mL of sulfuric acid solution with a concentration of 20% by volume, place it in a digital display constant temperature water bath, and stir at 70°C for 20 minutes to obtain an acidic ferrous salt solution. Magnesium acetate was added to the ferrous salt solution, and stirred at 70°C for 20 min to obtain an acidic ferric salt solution; wherein, the molar ratio of the iron element in the ferrous sulfate to the magnesium element in the magnesium acetate was 100:60;

[0031](2) After step (1) is stirred, add the oxidant cerium ammonium nitrate, wherein the molar ratio of the iron element in the ferrous sulfate to the cerium ammonium nitrate is 100:2, continue stirring for 40 minutes, and obtain a mixed solution after adding acetic acid; The molar ratio of iron element in the ferrous salt is 2.5:100; ...

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