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Method for recycling aluminum and magnesium from sludge and preparing composite flame retardant

A composite flame retardant and aluminum recovery technology, which is applied in the field of aluminum hydroxide composite flame retardant and mixed preparation of magnesium hydroxide, can solve the problems of unreasonable utilization of magnesium resources, huge output of water supply sludge, and unresourced utilization of aluminum. , to achieve high recovery rate, less reunion, and achieve the effect of recycling

Active Publication Date: 2017-05-17
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the sludge is leached, a large amount of magnesium in the leach solution is difficult to separate. When the leach solution is used as a ternary battery raw material, the purity of cobalt, nickel, manganese, etc. is low, and a large amount of magnesium resources in the leach solution cannot be rationally utilized, resulting in waste of magnesium resources.
At the same time, there is a huge output of water supply sludge, and the problem of unresourced utilization of aluminum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Pretreatment of heavy metal sludge: add heavy metal sludge to pure water according to the mass ratio of pure water to sludge dry matter 8:1, turn on the electric furnace to heat up, and adjust the pH to 7.0 with 0.5mol / L dilute sulfuric acid aqueous solution while stirring ( The temperature was finally stabilized at 80°C, and pH=7.0 was measured at this temperature), and the stirring was continued for 10 minutes to obtain a filtrate and a filter residue; the filter residue was washed and filtered with hot water at 80-90°C Dehydrated 1 time to obtain washing liquid. The filtrate and the washing liquid are combined to obtain magnesium liquid. Magnesium in the magnesium solution accounts for more than 99% of the magnesium in the heavy metal sludge, the content of Ni is 0.5mg / L, Co, Mn, and Zn are not detected, and the content of Cu is 0.1mg / L. Although Na, Ca, and Clˉ The content is relatively high but it is not harmful to the prepared product.

[0026] 2. Pretreatme...

Embodiment 2

[0033] 1. Pretreatment of heavy metal sludge: add heavy metal sludge to pure water according to the mass ratio of pure water to sludge dry matter 15:1, turn on the electric furnace to heat up, and adjust the pH to 8.0 with 1mol / L dilute sulfuric acid aqueous solution while stirring (temperature Finally stabilized at 85°C (pH = 8.0 was measured at this temperature), continue to stir for 15 minutes, and dehydrate the water residue mixture through plate and frame pressure filtration to obtain filtrate 1 and filter residue 1; filter residue 1 with 80-90°C hot water Wash, filter and dehydrate 3 times to obtain filtrate 2. The filtrate obtained by combining filtrate 1 and filtrate 2 is magnesium liquid. Magnesium in the magnesium solution accounts for more than 99% of the magnesium in the heavy metal sludge, the content of Ni is 0.6mg / L, Co, Mn, and Zn are not detected, and the content of Cu is 0.2mg / L. Although the content of Na, Ca, and Clˉ Higher but not harmful to the prepared ...

Embodiment 3

[0041] 1. Pretreatment of heavy metal sludge: Add heavy metal sludge to pure water according to the mass ratio of pure water to sludge dry matter 10:1, turn on the electric furnace to heat up, and adjust the pH to 7.5 with 0.7mol / L dilute sulfuric acid aqueous solution while stirring ( The temperature was finally stabilized at 82°C (pH=7.5 was measured at this temperature), and the stirring was continued for 12 minutes to obtain the water-slag mixture dehydrated by plate and frame pressure filtration to obtain filtrate 1 and filter residue 1; filter residue 1 was heated at 80-90°C Wash with water, filter and dehydrate twice to obtain filtrate 2. The filtrate obtained by combining filtrate 1 and filtrate 2 is magnesium liquid. Magnesium in the magnesium solution accounts for more than 99% of the magnesium in the heavy metal sludge, the content of Ni is 0.3mg / L, Co, Mn, and Zn are not detected, and the content of Cu is 0.1mg / L. Although the content of Na, Ca, and Clˉ Higher but...

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Abstract

The method belongs to the field of recycling utilization of resources and relates to a method for recycling and extracting magnesium from heavy metal sludge, recycling aluminum salt from water supply sludge, and then mixing, precipitating and preparing a magnesium hydrate and aluminum hydroxide composite flame retardant. According to the invention, the comprehensive recovery of valuable metal magnesium from the heavy metal sludge is effectively realized, and meanwhile, the high recovery rate of the noble metal cobalt and nickel is guaranteed; the high recovery rate of aluminum in the water supply sludge can reach above 85%; the mixed particle of magnesium hydrate and aluminum hydroxide composite in the prepared composite flame retardant has a shape of hexagonal sheet; the composite flame retardant is regular in morphology, is excellent in dispersing effect and is less in agglomeration; the thermal decomposition temperature can reach up to 360 DEG C; and thus the composite flame retardant is a flame retardant with excellent performances.

Description

technical field [0001] The invention belongs to the field of resource recycling, and more specifically relates to a method for recovering and extracting magnesium from heavy metal sludge, recovering aluminum salt from water supply sludge, and then mixing and preparing magnesium hydroxide and aluminum hydroxide composite flame retardant. Background technique [0002] At present, the development of flame retardants in the world shows the development trend of non-halogenated, compound, harmless and low-smoke. As inorganic flame retardants, magnesium hydroxide and aluminum hydroxide have good chemical stability, are non-toxic, do not produce harmful gases, are good for the environment, and have rich sources of raw materials. They have become the mainstream direction of flame retardant technology development. Single use of a flame retardant has poor compatibility with the filled polymer and is not easy to disperse in the filler, affecting the mechanical and mechanical properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/22
CPCC08K3/22C08K2003/2224C08K2003/2227C08K2201/006
Inventor 许开华张云河盛广宏郭苗苗
Owner JINGMEN GEM NEW MATERIAL
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