Method for preparing flocculant of ferric chloride of polysilicon acid

A polysilicate ferric chloride and flocculant technology, applied in the fields of ferric halide, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complex process and high cost

Inactive Publication Date: 2007-07-25
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the patent CN1210818A, polyferric chloride and polysilicic acid are compounded, and ferric trichloride is required to produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of polyferric chloride: Take 200ml hydrochloric acid pickling waste liquid, add 4g iron oxide scale, stir at a temperature greater than 60°C for 2.5 hours, after filtering, add 10g KClO to the filtrate 3 , 3.2g KH 2 PO 4 , 2gCaO was stirred for 1.5 hours to obtain polyferric chloride.

[0018] Preparation of polysilicic acid: Use 20g of sodium silicate, activate with 25ml of 1:1 hydrochloric acid and 120ml of water for 0.5h to obtain polysilicic acid.

[0019] Preparation of polysilicate ferric chloride: under high-shear stirring condition, the prepared polysilicate and polyferric chloride are mixed and stirred evenly, and matured at 40° C. for 1 hour.

Embodiment 2

[0021] Preparation of polyferric chloride: Take 500ml of hydrochloric acid pickling waste, add 10g of iron oxide scale, stir for 2 hours at a temperature greater than 70°C, filter, add 25g of KClO to the filtrate 3 , 8g KH 2 PO 4 , 6g MgO was stirred for 1.7 hours to obtain polyferric chloride.

[0022] Preparation of polysilicic acid: use 50g of sodium silicate, activate with 75ml of 1:1 hydrochloric acid and 300ml of water for 0.5h to obtain polysilicic acid.

[0023] Preparation of polysilicate ferric chloride: under high-shear stirring condition, the prepared polysilicate and polyferric chloride are mixed and stirred evenly, and matured at 35° C. for 1.5 hours to prepare.

Embodiment 3

[0025] Preparation of polyferric chloride: Take 500ml of hydrochloric acid pickling waste, add 10g of iron oxide scale, stir for 2 hours at a temperature greater than 70°C, filter, add 25g of KClO to the filtrate 3 , 8g KH 2 PO 4 , 20g Mg(OH) 2 Ca(OH) 2 Mix the slurry and stir for 1.6 hours to obtain polyferric chloride.

[0026] Preparation of polysilicic acid: use 50g of sodium silicate, activate with 75ml of 1:1 hydrochloric acid and 300ml of water for 0.5h to obtain polysilicic acid.

[0027] Preparation of polysilicate ferric chloride: under high-shear stirring condition, the prepared polysilicate and polyferric chloride are mixed and stirred evenly, and aged at 45°C for 0.5h to prepare.

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Abstract

This invention discloses a method for preparing a stable inorganic polymer flocculant, polyferric silicate chloride, from industrial acid-washing wastewater and iron scale by high-speed shearing, and its application in tap water purification. The method comprises: adding certain amounts of HCl and iron scale according to the contents of free acid and iron in industrial acid-washing wastewater, adding oxidant and stabilizer, oxidizing and polymerizing, adjusting the alkalinity with CaO (or MgO, or mixed slurry of Mg(OH)2 and Ca(OH)2) to obtain stable polyferric chloride, adding poly(silicic acid), and polymerizing under high speed shearing to obtain stable polyferric silicate chloride flocculant. The method has such advantages as simple process, mild reaction conditions and low investment, and is environmentally friendly. The prepared polyferric silicate chloride has better effect on tap water purification than polyferric chloride, ferric chloride and other iron-containing flocculant.

Description

technical field [0001] The present invention mainly uses hydrochloric acid pickling waste liquid and iron oxide scale produced in the production process of iron and steel industry to prepare a water treatment agent---polysilicate ferric chloride, the flocculant is especially suitable for water supply purification, waste water treatment, Low temperature and low turbidity water treatment. Background technique [0002] At present, there is a serious shortage of water resources in our country. The task of water purification and treatment is becoming increasingly heavy to protect the ecological environment, protect natural resources, prevent and control pollution and other public hazards. The water quality of the raw water of the water plant often changes with the degree of pollution of the water source, and is sometimes affected by sudden pollution accidents. In order to seek economical and effective treatment effects, water plants adopt several different treatment methods at t...

Claims

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Application Information

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IPC IPC(8): C01G49/10C02F1/52
Inventor 衣守志马计飞刘丹凤吴燕
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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