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Method for preparing polyferric-acid modified clay complex by using pickling wastewater to modify clay

A technology of pickling wastewater and acid modification, which is applied in the direction of water pollutants, metallurgical wastewater treatment, chemical instruments and methods, etc. It can solve the problems of large amount of raw materials and sludge, and a large amount of clay, so as to solve the pollution problem , Large economic value, cost-saving effect

Inactive Publication Date: 2019-07-09
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, it is found that a large amount of clay needs to be sprinkled, resulting in a large amount of raw materials and sludge.

Method used

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  • Method for preparing polyferric-acid modified clay complex by using pickling wastewater to modify clay
  • Method for preparing polyferric-acid modified clay complex by using pickling wastewater to modify clay
  • Method for preparing polyferric-acid modified clay complex by using pickling wastewater to modify clay

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Embodiment 1

[0038] A method for preparing a polyferric-acid modified clay composite by using pickling waste water modified clay, specifically comprising the following steps:

[0039] (1) Iron and steel pickling wastewater is discharged into the treatment system by an acid-resistant pump;

[0040] (2) Use fiber biofilm (pore size 1-3 microns) to separate solids, suspended solids and other impurities in pickling wastewater, and remove solid interfering substances. Then, the waste water is discharged into the regulating tank. Detect the composition of pickling waste liquid, adjust the content of total ferrous ion and free acid in pickling waste water, so that Fe 2+ :H + 1:2;

[0041] (3) The pickling waste liquid is discharged into the reaction kettle, and 5L of pickling waste water and 3kg of commercially available clay (bentonite former soil, see figure 1 ) and stir (stirring speed is 200 rpm, stirring at room temperature for 30min); complete acid-modified clay;

[0042] (4) Detect th...

Embodiment 2

[0047] A method for preparing a polyferric-acid modified clay composite by using pickling waste water modified clay, specifically comprising the following steps:

[0048] (1) Iron and steel pickling wastewater is discharged into the treatment system by an acid-resistant pump;

[0049] (2) Use fiber biofilm (pore size 1-3 microns) to separate solids, suspended solids and other impurities in pickling wastewater, and remove solid interfering substances. Then, the waste water is discharged into the regulating tank. Detect the composition of pickling waste liquid, adjust the content of total ferrous ion and free acid in pickling waste water, so that Fe 2+ :H + 1:2;

[0050] (3) Discharge the pickling waste liquid into the reaction kettle, mix 5L of pickling waste water with 3kg of commercially available clay (bentonite) and stir (stirring speed is 200 rpm, stirring at room temperature for 30min); complete the acid-modified clay;

[0051](4) Detect the ferric content in the resi...

Embodiment 3

[0056] A method for preparing a polyferric-acid modified clay composite by using pickling waste water modified clay, specifically comprising the following steps:

[0057] (1) Iron and steel pickling wastewater is discharged into the treatment system by an acid-resistant pump;

[0058] (2) Use fiber biofilm (pore size 1-3 microns) to separate solids, suspended solids and other impurities in pickling wastewater, and remove solid interfering substances. Then, the waste water is discharged into the regulating tank. Detect the composition of pickling waste liquid, adjust the content of total ferrous ion and free acid in pickling waste water, so that Fe 2+ :H + 1:2;

[0059] (3) Discharge the pickling waste liquid into the reaction kettle, mix 5L of pickling waste water with 3kg of commercially available clay (bentonite) and stir (stirring speed is 200 rpm, stirring at room temperature for 30min); complete the acid-modified clay;

[0060] (4) Detect the ferric content in the res...

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Abstract

The invention discloses a method for preparing a polyferric-acid modified clay complex by using pickling wastewater to modify clay. According to the invention, bentonite is modified by acids in pickling wastewater, and at the same time calcium chloride is introduced as a stabilizer, sodium hypochlorite is taken as an oxidant, and iron ions are polymerized at a suitable temperature to form a polymer flocculated precipitate. After the process, the product is an acid-modified bentonite containing an inorganic polyferric compound, and can be applied to treatment of industrial wastewater or micro-algae landscape water; zero discharge of waste acids can be achieved, and the effect on environment during original transportation and treatment. Separated waste acids can react with calcium hydroxideto form calcium chloride which can be used as a stabilizer; zero emission, zero pollution, full recovery and full utilization can be achieved; and the method has good economic and environmental benefits.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of pickling wastewater treatment, and in particular relates to a method for preparing a polyferric-acid modified clay compound by using the pickling wastewater modified clay. [0003] 【Background technique】 [0004] Iron and steel pickling wastewater comes from the pre-plating treatment in the electroplating workshop, the pre-treatment of the painted parts in the painting workshop, and the surface cleaning of the workpiece in the heat treatment workshop. It generally contains sulfuric acid or hydrochloric acid, and also contains a large amount of iron ions. Taking Zhangzhou City, Fujian Province as an example, in 2016, there were 43 enterprises involved in acid cleaning of steel surfaces in Zhangzhou, which discharged 138.95 tons of steel pickling wastewater (data from Zhangzhou Environmental Protection Bureau). Pickling wastewater will cause serious damage to aquatic ecosystems, so direct discharge ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/00C02F103/16C02F101/20
CPCC02F1/00C02F1/5236C02F2101/20C02F2103/16
Inventor 黄旭光兰旺荣
Owner MINNAN NORMAL UNIV