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Method for low-cost industrial purification of pickling iron oxide red

A low-cost, pickling technology, used in the metallurgical industry and the field of waste acid treatment, can solve the problems of inability to recycle, reduce production efficiency, pollute the environment, etc., to meet the requirements of circular economy and environmental protection, realize automatic operation, technical operation less demanding effects

Inactive Publication Date: 2011-02-16
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that, adding crushed iron to neutralize the free HCl in the pickling solution, adding alkali to adjust the pH value of the pickling solution, the pickling solution cannot be directly recycled without further reaction treatment, and the method operates It is more complicated and the process steps are longer, which greatly increases energy consumption and production and operation costs, and reduces production efficiency
In this method, alkali is added as ammonia water, which not only poses a threat to the health of operators, but also pollutes the environment.

Method used

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  • Method for low-cost industrial purification of pickling iron oxide red
  • Method for low-cost industrial purification of pickling iron oxide red
  • Method for low-cost industrial purification of pickling iron oxide red

Examples

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Embodiment 1

[0023] Embodiment 1: the Fe of pickling solution in the present embodiment 2+ The concentration is 135g / L, the free HCl concentration is 36g / L, and the Si concentration is 30mg / L.

[0024] 1. Weigh 1Kg of nucleating agent, inject 500L deionized water into the dissolution tank, slowly disperse the nucleating agent into the dissolution tank, start the agitator, stir at a fast speed (350r / min) for 60min, and slowly (120r / min) Stir for 20 min until a homogeneous viscous solution is formed.

[0025] 2. Weigh 200g of accelerant, inject 500L of deionized water into the dissolution tank, slowly disperse the accelerant into the dissolving tank, start the agitator, stir at a high speed (300r / min) for 80min, and stir at a slow speed (120r / min) 30min to form a uniform viscous solution.

[0026] 3. The pickling liquid in the waste acid tank passes through the waste acid pump at a rate of 20m 3 / h flow rate, the pickling solution is heated to 80°C by the graphite heater and then injected...

Embodiment 2

[0031] Embodiment 2: the Fe of pickling solution in the present embodiment 2+ The concentration is 108g / L, the free HCl concentration is 30g / L, and the Si concentration is 24mg / L.

[0032] 1. Weigh 500g of nucleating agent, inject 400L of deionized water into the dissolution tank, slowly disperse the nucleating agent into the dissolution tank, start the agitator, stir for 70min at a fast speed (300r / min), and stir at a slow speed (100r / min) Stir for 20 min until a homogeneous viscous solution is formed.

[0033] 2. Weigh 100g of accelerant, inject 400L of deionized water into the dissolution tank, slowly disperse the accelerant into the dissolving tank, start the agitator, stir at a high speed (280r / min) for 50min, and stir at a slow speed (100r / min) 25min to form a uniform viscous solution.

[0034] 3. The pickling liquid in the waste acid tank passes through the waste acid pump at a rate of 25m 3The flow rate per hour, the pickling solution is heated to 75°C by the graphi...

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Abstract

The invention relates to a method for low-cost industrial purification of pickling iron oxide red, belonging to the field of waste acid processing. The method is characterized by comprising the following steps: preparing a compound purifying agent solution including a nucleating agent and a growth substance, heating a pickling liquid to 60-80 DEG C with a graphite heater, injecting the pickling liquid into a reaction tank at a flow rate of 10-25m<3> / h, adding the nucleating agent into the reaction tank in terms of that the concentration of the nucleating agent in the pickling liquid is about 30-100mg / L, stirring for 10-60min to nucleate colloidal suspended silicon-containing micro particles, adding the growth substance into the reaction tank in terms of that the concentration of the growth substance in the pickling liquid is about 5-25mg / L to enable the nucleated suspended silicon-containing impurity particles to be combined with the growth substance to grow, stirring for 10-30min, pumping the mixed liquid in the reaction tank into a buffer tank, stirring for 10-30min, and introducing the mixed liquid to a deposition tank to realize the settlement separation of the silicon-containing impurities. The invention has the advantages of low operating requirement, simple process flow, low production cost and smooth production process, and can basically realize automated operation. Besides, the purified pickling iron oxide red can be directly for sale or used in subsequent production procedures, thereby improving the economic benefit.

Description

technical field [0001] The invention belongs to the technical field of the metallurgical industry, in particular to the technical field of waste acid treatment, and relates to a method for industrially purifying pickling iron red at low cost from waste acid pickling liquid. technical background [0002] As we all know, hot-rolled strip steel can be cold-rolled after being pickled with hydrochloric acid. During hydrochloric acid pickling, the iron and scale on the surface of the steel strip are washed off by hydrochloric acid, and the consumed hydrochloric acid is transformed into FeCl 2 Mainly chloride, dissolved in hydrochloric acid solution. The steel strip is cleaned with hydrochloric acid to remove the scale on the surface of the steel strip to ensure the surface quality of the cold-rolled steel plate. Its main reaction chemical equation is: [0003] Fe+2HCl=FeCl 2 +H 2 o [0004] FeO+2HCl=FeCl 2 +H 2 o [0005] At present, Ruthner-spray roasting technology is b...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 邵慧萍韩继征陈存广孙长杰罗骥谢强杨薇薇邢纪萍
Owner UNIV OF SCI & TECH BEIJING