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Neutralization technology of cold-rolled acid sludge and alkali oil sludge and method for preparing blast furnace pellets from neutralized products

A technology of cold-rolled alkali and acid sludge, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of no treatment method, save disposal fees, reduce treatment costs, reduce The effect of production costs

Active Publication Date: 2020-05-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, there is currently no effective treatment method for cold-rolled acid sludge and cold-rolled alkali oil sludge, and most of them are treated by stockpiling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Neutralization of cold-rolled acid sludge and cold-rolled alkali sludge

[0032] (1) When the normal temperature is 20°C, take cold-rolled acid sludge, that is, 60kg of mud cake after pressure filtration of the sedimentation tank bottom sludge in the acid regeneration workshop of the cold-rolling plant, and 336kg of cold-rolled alkali oil sludge from the cold-rolling plant, add it to the mixing tank and press the solid Add tap water at a liquid ratio of 1:5 and stir for 10 minutes to control the pH of the mixture to 7.

[0033] (2) The cold-rolled acid sludge and cold-rolled alkali sludge in the mixing tank are separated from solid and liquid after neutralization and precipitation to form neutralization mud and neutralization water. The waste oil on the liquid surface of the mixing tank is skimmed and put into an oil storage tank for collection and sold to oil refinery factory.

[0034] (3) The neutralized mud is unloaded by the screw conveyor, and the mud cake filt...

Embodiment 2

[0053]1. Neutralization of cold-rolled acid sludge and cold-rolled alkali sludge

[0054] (1) When the normal temperature is 20°C, take 120kg of cold-rolled acid sludge, that is, the mud cake after pressure filtration of the sedimentation tank bottom sludge in the acid regeneration workshop of the cold-rolling plant, and 650kg of cold-rolled alkali oil sludge from the cold-rolling plant, add it to the mixing tank, and press Add tap water and stir for 8 minutes with a solid-to-liquid ratio of 1:6, and control the pH of the stirred solution to 7.1.

[0055] (2) The cold-rolled acid sludge and cold-rolled alkali sludge in the mixing tank are separated from solid and liquid after neutralization and precipitation to form neutralization mud and neutralization water. The waste oil on the liquid surface of the mixing tank is skimmed and put into an oil storage tank for collection and sold to oil refinery factory.

[0056] (3) The neutralized mud is unloaded by the screw conveyor, and...

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Abstract

The invention relates to a neutralization technology for cold-rolling acidic and alkaline oily sludge and a method for preparing blast furnace pellets from a neutralization product of cold-rolling acidic and alkaline oily sludge. The neutralization method for the cold-rolling acidic and alkaline oily sludge comprises the following steps: neutralization of the cold-rolling acidic and alkaline oilysludge, separation of waste oil, preparation of a neutralized powder material, and preparation of sodium chloride and potassium chloride. The blast furnace oxidized pellets are prepared from the neutralized powder material of the cold-rolling acidic and alkaline oily sludge, refined ore powder and a binder, namely bentonite, through the following steps: mixing 3% to 5% by weight of the neutralizedpowder material of the cold-rolling acidic and alkaline oily sludge with 95% to 97% by weight of the refined ore powder, and adding 1.1% to 1.2% of the bentonite so as to prepare the blast furnace oxidized pellets. The method provided by the invention realizes harmless treatment of the cold-rolling acidic and alkaline oily sludge, does not generate secondary pollution and has low treatment cost;meanwhile, the resource of the iron element is recycled and effectively utilized as a raw material for production of the blast furnace pellets, so production cost of the blast furnace pellets is reduced, and the treatment cost of the cold-rolling acidic and alkaline oily sludge is saved for enterprises; and economic benefits, environmental benefits and social benefits are brought for iron and steel enterprises.

Description

technical field [0001] The invention relates to the field of utilization of cold-rolled acid-alkali sludge in metallurgical enterprises, in particular to a neutralization technology of cold-rolled acid sludge and alkali oil sludge and a method for preparing blast furnace oxidation pellets from neutralized products. Background technique [0002] Cold-rolled acid sludge, that is, the sludge produced by the settling tank of the acid regeneration workshop of the cold rolling plant is mainly composed of iron oxide, which contains residual hydrochloric acid. The content of hydrochloric acid in the waste liquid of the settling tank is about 11-15%. Because the acid mud contains hydrochloric acid and water, it is difficult to accurately measure the hydrochloric acid content in the acid mud. Acid sludge has a high total iron content and is valuable for recycling. However, due to the corrosiveness of residual hydrochloric acid in acid sludge, it cannot be directly used as a raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248C02F11/12C02F11/00
CPCC02F11/00C02F11/122C22B1/248
Inventor 杨大正高军曲余玲侯洪宇徐鹏飞贾凡胡煜晗耿继双张大奎
Owner ANGANG STEEL CO LTD
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