Treatment method for realizing comprehensive utilization of industrial acid pickling waste liquid and sulfate slag

An industrial pickling and treatment method technology, applied in the direction of improving process efficiency, etc., can solve the environmental pollution of steel rolling pickling waste acid, etc., achieve the effects of high fineness, improve ball forming performance, and avoid pollution

Active Publication Date: 2014-09-17
TIANJIN YIBAI GUANGTONG CULTURE MEDIA DEVCO
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

This not only organically combines the chemical process and the metallurgical process, but also reduces the production cost and solves the environmental pollution problem of waste acid from rolling pickling

Method used

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  • Treatment method for realizing comprehensive utilization of industrial acid pickling waste liquid and sulfate slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 100mL of pickling waste liquid to be treated, add 120mL of lime emulsion, add 100 grams of anhydrous calcium chloride while stirring constantly, the reaction time is 30 minutes, and after the reaction, the iron-based solution with a chlorinating agent content of 15.23wt% is obtained. Chlorinating agent; calcium chloride is added to the iron-based chlorinating agent, and the content of the chlorinating agent in the iron-based chlorinating agent is 51.25wt%.

[0043] Mix the iron-based chlorinating agent prepared above and the sulfuric acid slag to be treated uniformly at a mass ratio of 1:4, and then pelletize on a disc granulator to obtain pellets with a particle size of 15-20 mm.

[0044] The pellets were put into a muffle furnace, chlorinated and roasted at a high temperature of 1050°C for 60 minutes, and cooled naturally to obtain oxidized pellets.

[0045] The oxidized pellets obtained in Example 1 are analyzed by X-ray fluorescence spectrum, and the obtained a...

Embodiment 2

[0047] Take 100mL of pickling waste liquid to be treated, add 100mL of lime emulsion, add 200 grams of anhydrous calcium chloride while stirring constantly, the reaction time is 30 minutes, and after the reaction, the iron-based chloride with a chlorinating agent content of 14.66% is obtained. Calcium chloride is added in the iron-based chlorinating agent, and the content of the chlorinating agent in the iron-based chlorinating agent is 53.66wt%.

[0048] The iron-based chlorinating agent prepared above and the sulfuric acid slag to be treated are mixed uniformly with the iron-based chlorinating agent and sulfuric acid slag according to the mass ratio of 1:6, and then pelletized on a disc granulator to obtain a particle size of 15 -20mm pellets.

[0049] Put the above-mentioned pellets into a muffle furnace, chlorinated and roasted at 1100°C for 60 minutes, and cooled naturally to obtain oxidized pellets.

[0050] The oxidized pellets obtained in Example 2 were analyzed by X-...

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Abstract

The invention discloses a treatment method for realizing comprehensive utilization of industrial acid pickling waste liquid and sulfate slag, which comprises the following steps: neutralizing acid pickling waste acid to obtain an iron-based chlorinating agent; adding the iron-based chlorinating agent into sulfate slag, mixing, and then granulating; and performing high-temperature chlorination roasting through a muffle furnace to obtain high-grade oxidized pellets, and simultaneously recovering metal chloride in flue gas to obtain rare precious metal powder which mainly comprises gold, silver, copper, zinc, lead and other valuable metal. According to the treatment method disclosed by the invention, the acid / base neutralization method and the high-temperature chlorination roasting method are combined, and the chloride in the steel rolling acid pickling waste liquid is converted into the chlorinating agent required for high-temperature chlorination roasting, so that the chloride in the waste liquid is effectively used as the valuable metal chlorinating agent, and the valuable metal is recovered, thereby solving the environmental problem and lowering the production cost.

Description

technical field [0001] The invention belongs to the field of resource recycling and recycling. Background technique [0002] Cold-rolled steel sheets are important raw materials for the automotive industry, household appliances, container transportation, and welded pipe production. Since a layer of iron oxide scale is often formed on the surface of the steel plate that has been placed for a long time, the steel plate needs to be pickled to remove this layer of iron oxide scale before cold rolling, which will consume a large amount of acid and generate a large amount of waste acid. Generally speaking, the waste acid produced by cold rolling mills contains about 10% of free hydrochloric acid and about 20-30% of free iron ions. Taking a small and medium-sized cold rolling mill as an example, the amount of waste acid per day is tens to hundreds tons, then about 10 tons of hydrochloric acid, about 70 tons of ferrous chloride, and by-product slaked lime can be recovered in one da...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B1/243C22B1/08
CPCY02P10/20
Inventor 马守栋张毅民吴兆钰
Owner TIANJIN YIBAI GUANGTONG CULTURE MEDIA DEVCO
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