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A method for producing calcium ferrite for polyaluminum ferric chloride by using pickling tank slag

A technology of polyaluminum ferric chloride and calcium ferrite, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of complex production process of polyaluminum ferric chloride, achieve good water control effect and improve quality. The effect of high content and mass percentage

Active Publication Date: 2020-06-16
CHANGZHOU QINGLIU WATER TREATMENT AGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of complex production process of polyaluminum ferric chloride in the prior art, and provide a method for producing calcium ferrite for polyaluminum ferric chloride by utilizing pickling tank slag

Method used

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  • A method for producing calcium ferrite for polyaluminum ferric chloride by using pickling tank slag
  • A method for producing calcium ferrite for polyaluminum ferric chloride by using pickling tank slag
  • A method for producing calcium ferrite for polyaluminum ferric chloride by using pickling tank slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In 5kg iron-containing waste acid solution (wherein Fe 2 o 3 The mass percentage content is 55.2%), first add 1.294kg of heavy calcium carbonate, then add 125g of sodium phosphate, after stirring evenly, sinter in the experimental muffle furnace at 800°C for 2h, cool to room temperature, crush, and sieve to obtain Calcium ferrite, the particle size of calcium ferrite after sieving is 0.08mm;

[0016] In a 1L flat-bottomed flask, add 500mL of 30% hydrochloric acid, 100mL of distilled water, and 125g of aluminum hydroxide, stir and react at 80°C, first heat and boil for 3 hours, then add 100mL of distilled water, then add 82g of calcium ferrite, continue heating and boiling for 1 hour , and suction filtration to obtain the finished polyaluminum ferric chloride.

Embodiment 2

[0018] In 6.666kg iron-containing waste acid solution (wherein Fe 2 o 3 The mass percent content is 55.2%), first add 1.725kg of heavy calcium carbonate, then add 150g of sodium phosphate, after stirring evenly, sinter in an experimental muffle furnace at 600°C for 24h, cool to room temperature, crush, and sieve to obtain Calcium ferrite, the particle size of calcium ferrite after sieving is 0.05mm;

[0019] In a 1L flat-bottomed flask, add 500mL of 30% hydrochloric acid, 100mL of distilled water, and 150g of aluminum hydroxide. Stir the reaction at 100°C and heat and boil for 3 hours, then add 100mL of distilled water, then add 82g of calcium ferrite, and continue heating and boiling for 1 hour Suction filtration to obtain the finished polyaluminum ferric chloride.

Embodiment 3

[0021] In 4.5kg iron-containing waste acid solution (wherein Fe 2 o 3 The mass percent content is 55.2%), first add 1.165kg of heavy calcium carbonate, then add 113g of sodium phosphate, after stirring evenly, sinter in an experimental muffle furnace at 900°C for 1h, cool to room temperature, crush, and sieve to obtain Calcium ferrite, the particle size of calcium ferrite after sieving is 0.01mm;

[0022] In a 1L flat-bottomed flask, add 500mL of 30% hydrochloric acid, 100mL of distilled water, and 113g of aluminum hydroxide, stir and react at 100°C and heat to boil for 3 hours, then add 100mL of distilled water, then add 82g of calcium ferrite, continue heating and boiling for 1 hour, Suction filtration to obtain the finished polyaluminum ferric chloride.

[0023] See Table 1 for the index comparison with commercially available polyaluminum ferric chloride. The following commercially available polyaluminum ferric chloride refers to the polyaluminum ferric chloride produced ...

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Abstract

The invention especially relates to a method for producing calcium ferrite applied to production of polyaluminum chloride by using residues in a pickling bath, belonging to the field of production methods for water purifying agents. The method comprises the following steps: adding a desiccant into an iron-containing waste acid solution; then adding an auxiliary catalyst and carrying out uniform stirring; then carrying out calcining at a constant temperature of 600-900 DEG C in an air atmosphere for 1 to 24 h; and successively carrying out cooling to room temperature, crushing and sieving so asto obtain calcium ferrite. In polyaluminum chloride synthesized from calcium ferrite prepared in the invention, the mass percentage of iron is 3.5% or more; and the synthesized polyaluminum chloridehas greater relative molecular weight than the relative molecular weight of commercially available polyaluminum chloride, and is improved in purification effect. Polyaluminum chloride synthesized fromcalcium ferrite prepared in the invention has obviously better coagulation effect compared with current commercially-available polyaluminum chloride.

Description

technical field [0001] The invention belongs to the technical field of water purifiers, and in particular relates to a method for producing calcium ferrite for polyaluminum ferric chloride by using pickling slag. Background technique [0002] The commonly used inorganic coagulant is mainly polyaluminum chloride, but the aluminum salt has the disadvantages of low molecular weight, low gravity and slow settling. However, iron salt coagulants such as polyferric sulfate and ferric chloride do not have such problems, so aluminum-iron composite products appeared in my country in the 1980s. At present, polyaluminum ferric chloride on the market is mainly made by adding a certain amount of ferric chloride in the process of producing polyaluminum chloride, or reacting with iron-containing waste acid and calcium aluminate powder, and then separating by precipitation, and taking the supernatant. liquid to obtain liquid composite aluminum-iron water purifier product. This process is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00C02F1/52
CPCC01G49/0036C01P2004/61C02F1/5236
Inventor 韩晓刚李雪峰赵佳顾玲玲蒋晓春
Owner CHANGZHOU QINGLIU WATER TREATMENT AGENT
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