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Method for synergistically treating heavy metal sludge

A heavy metal sludge and co-processing technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve high equipment investment or operating costs, high energy consumption in the utilization process, and heavy metal recovery rate Low-level problems, to achieve the effect of complete detoxification, low investment and operating costs, and large amount of sludge treatment

Active Publication Date: 2016-01-27
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Therefore, aiming at the defects of the existing process, such as small processing capacity, poor applicability, low recovery rate of heavy metals, complex process flow, high equipment investment or operating costs, high energy consumption in the utilization process, incomplete harmlessness and easy to cause secondary pollution, etc., the present invention The technical problem to be solved is to provide a method for the complete elimination of pollution, recovery of valuable substances, and low cost of disposal of heavy metal sludge

Method used

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  • Method for synergistically treating heavy metal sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The heavy metal sludge comes from the cold rolling wastewater treatment station of a stainless steel enterprise. It is a by-product of the lime milk-chemical precipitation process to treat cold rolling wastewater (referred to as cold rolling sludge). After the cold rolling sludge is filtered by plate and frame, it is stored in In a warehouse with anti-seepage base and good ventilation, the typical chemical components of the sludge are: Cr(3.0%), Ni(0.7%), Zn(0.02%), Pb(0.03%), Fe(22.4%), Si (3.1%), K (0.03%), Na (0.01%), total carbon (2.0%), burning loss (15%), CaSO4 (22%), CaF2 (18%), CaCl2 (2%), heavy metal The sludge has fine particles, complex components, high leaching toxicity, and is classified as hazardous waste (National Hazardous Waste List HW17 and HW21). According to environmental protection requirements, it needs to be properly disposed of by outsourced qualified enterprises.

[0040] Such as figure 1 As shown, when 1,000 tons of cold rolling sludge is natu...

Embodiment 2

[0046] When 1,000 tons of stainless steel cold-rolling sludge is naturally dried to a moisture content of 45%, it is mixed with 200 tons of dolomite powder (calcium-based fluorine-fixing agent), dried, and crushed to obtain a moisture content of 15% and a particle size range of 1 to 5mm. Calcium-based sludge, in a one-month industrial test, calcium-based sludge and 15,000 tons of basic sintering raw materials (composed of 85 parts of concentrate powder, 5 parts of coal powder, 5 parts of dolomite powder and 5 parts of returned ore, of which The ore powder is composed of 15 parts of Carajas powder, 20 parts of CVRD powder, 5 parts of PB powder, 10 parts of Xie San mine, 3 parts of miscellaneous mine, 17 parts of Mac powder, 9 parts of Luobu River powder, and 31 parts of Yang Di powder) , 400 tons of dedusting ash (consisting of low-zinc dedusting ash from sintering waste gas dedusting device, blast furnace waste gas dedusting device and converter dedusting device in a certain pr...

Embodiment 3

[0051] When 1,000 tons of stainless steel cold rolling sludge is naturally dried to a moisture content of 35%, it is mixed with 250 tons of dolomite powder (calcium-based fluorine-fixing agent), dried, and crushed to obtain a moisture content of 18% and a particle size range of 0.5 to 5mm. Calcium-based sludge, in a one-month industrial test, calcium-based sludge and 18,000 tons of basic sintering raw materials (composed of 82 parts of concentrate powder, 8 parts of coal powder, 7 parts of dolomite powder and 3 parts of returned ore, of which The ore powder is composed of 10 parts of Carajas powder, 25 parts of CVRD powder, 15 parts of PB powder, 5 parts of Xie San mine, 5 parts of miscellaneous mine, 10 parts of Mac powder, 10 parts of Luobu River powder, and 20 parts of Yangdi powder) , 350 tons of dedusting ash (consisting of low-zinc dedusting ash from sintering waste gas dedusting device, blast furnace waste gas dedusting device and converter dedusting device in a certain ...

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Abstract

The present invention provides a method for synergistically treating heavy metal sludge. The method comprises: uniformly mixing heavy metal sludge with a water content of 20-50% and a calcium-based fluorine fixing agent, drying, crushing to obtain calcium-based sludge, uniformly mixing with a base sintering raw material and dust removing ash, granulating, and distributing the material, wherein a mass ratio of the base sintering raw material to the heavy metal sludge to the calcium-based fluorine fixing agent to the dust removing ash is 50-120:0.3-20:0.1-2:0.5-5; sintering the granulated mixing material to obtain sintered ore, wherein the flue gas produced during the sintering process passes through a dust removing and desulfurization device, and the purified flue gas is externally discharged through a chimney; and conveying the sintered ore into a blast furnace, and smelting, wherein the flue gas is externally discharged after the dust removing, the smelting residue is comprehensively utilized, and the alloy hot metal enters the steelmaking converter of the stainless steel enterprise. According to the present invention, dust, gas and wastewater can be discharged into the existing facilities so as to be treated; and with the synergetic treatment of the sintering process and the blast furnace smelting, most of the metal elements can be effectively recovered so as to achieve harmlessness and resources.

Description

technical field [0001] The invention belongs to the field of industrial hazardous waste treatment and comprehensive utilization, and in particular relates to a method for co-processing heavy metal sludge by using the existing sintering machine and blast furnace smelting process of a stainless steel enterprise. Background technique [0002] In smelting, metal processing, machine manufacturing, electroplating and other industrial production, heavy metal acid wastewater has a wide range of sources, many types, and complex components. The treatment processes can be summarized as chemical, physical, physical chemical, 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 environmental protection difficulties and key points of industrial enterpri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F103/16
Inventor 石磊朱建英刘金成奚赛峰
Owner BAOSHAN IRON & STEEL CO LTD
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