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Method for treating heavy metal sludge by using stainless steel molten slag

A technology for heavy metal sludge and stainless steel, which is applied in sludge treatment, special treatment targets, chemical instruments and methods, etc., can solve the problems of high equipment investment or operating costs, low recovery rate of heavy metals, and high energy consumption in the utilization process. The effect of industrialization promotion, large processing capacity, low investment and operating costs

Inactive Publication Date: 2015-04-15
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Therefore, the technical problem to be solved by the present invention is to provide a recycling and harmless treatment process for heavy metal sludge, which overcomes the small processing capacity, poor applicability, low recovery rate of heavy metals, complex process flow, equipment investment or operation of the existing process. Defects such as high cost, high energy consumption in the utilization process, incomplete harmlessness, easy to cause secondary pollution, etc.

Method used

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  • Method for treating heavy metal sludge by using stainless steel molten slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The heavy metal sludge comes from the stainless steel cold-rolling wastewater treatment station, which is a by-product of the lime milk-chemical precipitation process for cold-rolling wastewater (referred to as cold-rolling sludge). In a warehouse with good infiltration and ventilation, the typical chemical components of the sludge are: Cr (0.5-5%), Ni (0.1-1.0%), Zn (0.05-0.5%), Pb (0.05-0.5%), Fe (10-25%), CaSO4 (5-25%), CaF2 (5-15%), CaCl2 (1-5%), others (5-10%), heavy metal sludge particles are fine, complex components, leaching Highly toxic and classified as hazardous waste (National Hazardous Waste List HW17 and HW21), it needs to be properly disposed of by outsourced qualified enterprises.

[0057] like figure 1 As shown, when the cold-rolled sludge is naturally dried to a moisture content of 55%, it is crushed and sieved, and mixed with coal powder, quicklime, cement, waste oil sludge, and desulfurization ash in proportion (cold-rolled sludge 50%, coal powder 1...

Embodiment 2

[0066] Heavy metal sludge comes from the electroplating wastewater treatment process. The sludge is naturally dried to a water content of 60%, crushed and sieved, and mixed with coke powder, dolomite, attapulgite, waste oil sludge, and desulfurization ash in proportions by weight (sludge 40%, coke powder 15%, dolomite 15%) , Attapulgite 15%, waste oil sludge 10%, desulfurization ash 5%), using a twin-shaft screw mixer to mix evenly.

[0067] Dry the sludge agglomerate to a moisture content of 33%. In the compression molding process, the size of the sludge agglomerate is a pellet with a particle size of 15 mm.

[0068] Put the dried sludge pellets at a ratio of 15% (the proportion of sludge pellets to the total weight of stainless steel slag and sludge pellets in the slag tank), and put about 4.5t into the bottom of the stainless steel slag tank.

[0069] Others are with embodiment 1.

Embodiment 3

[0071] Heavy metal sludge comes from the chemical wastewater treatment process. The sludge is naturally dried to a water content of 50%, crushed and sieved, and mixed with coal powder, limestone, bentonite, waste oil sludge, and desulfurized ash in proportions by weight (30% of sludge, 10% of coal powder, 25% of limestone, and 15% of bentonite) , waste oil sludge 5%, desulfurization ash 15%), mixed evenly with a twin-shaft screw mixer.

[0072] The sludge lumps were dried to a moisture content of 8%. In the compression molding process, the size of the sludge agglomerate is a pellet with a particle size of 20 mm.

[0073] Put the dried sludge pellets at a ratio of 10% (the proportion of sludge pellets to the total weight of stainless steel slag and sludge pellets in the slag tank), and put about 3t into the bottom of the stainless steel slag tank.

[0074] Others are with embodiment 1.

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Abstract

The present invention discloses a method for treating heavy metal sludge by using stainless steel molten slag. The method comprises drying crushing, material matching mixing, pressing molding, drying, tank bottom material spreading, smelting reduction, gas purification, molten slag treating, metal recovery and other steps, and specifically comprises that: after heavy metal sludge is subjected to pre-treatment, a certain proportion of ingredients are matched, and the sludge agglomerate is adopted as the bottom spreading material and is placed into a stainless steel molten slag tank to carry out a harmless treatment on the sludge agglomerate. According to the present invention, the characteristics of high production amount, high temperature and rich sensible heat resource of the stainless steel molten slag are adopted, and the stainless steel molten slag is adopted to treat the heavy metal sludge, such that the harmless treatment on the hazardous components and the resource on the valuable material are achieved, the method is the new attempt crossing the industry, and the waste heat resource can be effectively utilized so as to achieve the waste treatment adopting the waste.

Description

technical field [0001] The invention relates to the field of industrial hazardous waste treatment and comprehensive utilization, in particular to a method for utilization and treatment of heavy metal sludge. Background technique [0002] Heavy metal wastewater has a wide range of sources and types, and its treatment processes can be classified into chemical, physical, physicochemical, and biochemical methods. The chemical neutralization precipitation method using lime milk as the main agent is widely used at home and abroad due to its mature process route, low cost of wastewater treatment, convenient maintenance and management, and high degree of automation. These are the key and difficult points of environmental protection for industrial enterprises. [0003] The analysis shows that after the solid-liquid separation facilities such as plate and frame filter, vacuum filter and diaphragm press, the moisture content of heavy metal sludge is 50-75%, and metal oxides such as Cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C22B7/00C22B1/248
CPCC02F11/00C02F11/12C02F2303/06C22B1/248C22B7/001Y02P10/20
Inventor 石磊陈荣欢朱建英顾国梁刘金成
Owner BAOSHAN IRON & STEEL CO LTD
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