Cold rolled acid waste water disposal neutralizer in metallurgical industry and its process method

Abstract

The present invention relates to a neutralizing agent for treating acid waste water produced by cold-rolling process in metallurgical industry and its technological method. The neutralizing agent is a magnesium system material containing soft-burned magnesium powder oversize which is pulverized into 100-140 meshes by using Raymond mill, electrofused magnesium dust-removed ash, soft-burned magnesium powder and MgO whose content is above 40%. Its technological process includes the following steps: 1. supplying waste acid water into pre-aeration pool and executing aeration; 2. supplying the aerated acid water into neutralizing pool; 3. supplying neutralizing agent into neutralizing tower; 4. neutralizing reaction including three modes: mixing and aerating, mechanical mixing and single aeration; 5 advection pool deposition; 6. sludge and water separation treatment. The invention provides a neutralizing agent which can directly generate economic benefit, save investment, use low operation cost, and is simple in device structure, easy in operation management, has broad neutralizing agent source, and uses three waste resources to treat waste, and cancels the new water consume in lime cream and realizes the reuse for reclaimed water a technological method and a device thereof.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for purifying and treating industrial acidic wastewater, in particular to a neutralizer for treating cold-rolled acidic wastewater in the metallurgical industry and a process method thereof. Background technique [0002] At present, domestic enterprises that use acid in iron and steel metallurgy, chemical industry, chemical fiber and other production processes discharge acidic wastewater. In the prior art, when solving acidic wastewater, in principle, it is divided into two steps, and the concentration above 4% is required to be recovered; the concentration below 3-4% is discharged after neutralization treatment, and the neutralizer is expensive. Lime, limestone, soda, caustic soda, etc. The country's discharge requirements for acidic wastewater PH = 6-9 SS suspended solids ≤ 100mg / L, COD ≤ 100mg / L can meet the discharge standards. The treatment of acidic...

AI Technical Summary

Problems solved by technology

For the treatment of acid wastewater, some of them are diluted and discharged, and even if the treatment and discharge cannot be guaranteed to meet the standard, even if the standard is met, only the PH value is assessed, and the more important COD and SS assessments are missed.

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