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Method for curing arsenic by using red mud/metakaolin-based multi-component solid waste geopolymer

A technology of metakaolin and geopolymer, applied in the field of heavy metal pollution control and solid waste treatment, can solve the problems of high treatment cost, poor stability, formation of sludge, etc., achieve reduction and harmless disposal, reduce diffusion and harm , the effect of simple process

Pending Publication Date: 2021-10-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common arsenic slag solid waste is treated by the calcium or iron chemical precipitation method formed in arsenic-containing wastewater, but the arsenic-containing solid waste formed by it has poor stability and forms sludge after treatment. The treatment cost is high and the disposal fails to meet the environmental protection requirements. standard
Biodegradation also has problems such as difficult large-scale application of live bacteria and poor stability. Safe curing / stabilization technology has the advantages of short processing time, low cost, good effect, and wide application range. It is the most effective way to treat arsenic-containing solid waste and hazardous waste. Technology

Method used

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  • Method for curing arsenic by using red mud/metakaolin-based multi-component solid waste geopolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: This example is taken from a smelter in Yunnan. The main components are shown in Table 1; the height is from a smelter in Henan. The main components are shown in Table 2; blast furnace slag from a smelter in southwest, mainly The ingredients are shown in Table 3; toxic sand comes from a mining area in Jiangxi, the main components are shown in Table 4;

[0024] Table 1 Red mud component

[0025] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

AS 2 O 3

15 16 21 13 5 0.4 10 0.01

[0026] Table 2 Gaolin ingredient

[0027] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

K 2 O

0.4 44.45 43.2 2.37 0.2 2.3 0.05 0.2

[0028] Table 3 blast furnace slag ingredients

[0029] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

K 2 O

42 27 13 0.3 1 8 0.4 0.3

[0030] Table 4 toxic sand ingredients

[0031] Cao SiO 2

Al 2 O 3

FE 2 O...

Embodiment 2

[0044] Example 2: This example is taken from a smelter in Yunnan. The main components are shown in Table 1; the height is from a smelter in Henan. The main components are shown in Table 2; the blast furnace slag from a smelter in the southwest, mainly The ingredients are shown in Table 3; toxic sand comes from a mining area in Jiangxi, the main components are shown in Table 4;

[0045] Table 1 Red mud component

[0046] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

AS 2 O 3

14.2 12 23 11 4 2.3 9.6 0.02

[0047] Table 2 Gaolin ingredient

[0048] Cao SiO2 Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

K 2 O

0.3 41.45 44.2 2.57 0.4 3.3 0.45 0.3

[0049] Table 3 blast furnace slag ingredients

[0050] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

K 2 O

42.3 27.2 13.2 0.27 1.0 5.7 0.2 0.8

[0051] Table 4 toxic sand ingredients

[0052] Cao SiO 2

A...

Embodiment 3

[0066] Example 3: This example is taken from a smelter in Yunnan, and the main components are shown in Table 1; the genolin comes from a smelter in Henan. The main components are shown in Table 2; blast furnace slag from a smelter in the southwest, mainly The ingredients are shown in Table 3; toxic sand comes from a mining area in Jiangxi, the main components are shown in Table 4;

[0067] Table 1 Red mud component

[0068] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

AS 2 O 3

11.2 7 23 13 3 1.3 8.5 0.03

[0069] Table 2 Gaolin ingredient

[0070] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

K 2 O

0.1 44.45 41.2 2.57 0.4 3.3 0.45 0.3

[0071] Table 3 blast furnace slag ingredients

[0072] Cao SiO 2

Al 2 O 3

FE 2 O 3

TiO 2

MGO NA 2 O

K 2 O

45.3 22.2 10.2 1.27 1.0 3.7 0.2 0.8

[0073] Table 4 toxic sand ingredients

[0074] Cao SiO ...

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Abstract

The invention discloses a method for solidifying arsenic by using a red mud / metakaolin-based multi-component solid waste geopolymer. According to the invention, industrial solid waste consisting of red mud, metakaolin, blast furnace slag and desulfurized gypsum are used as raw materials to prepare a backfill material for underground filling, so cost is low, and the strength and arsenic leaching concentration of the backfill material both meet national-standard requirements on leaching in China. The method is a comprehensive utilization method which applies the industrial solid waste such as red mud, metakaolin, blast furnace slag and desulfurized gypsum to curing and stabilizing of arsenic solid waste so as to treat the waste with the waste; the multi-component solid waste and an alkali activator are fully reacted to form rich ettringite to solidify arsenic in red mud and arsenopyrite; and meanwhile, due to the three-dimensional structure of a rich aluminosilicate cementing material in the geopolymer, the waste is treated by the waste, and arsenic immobilization efficiency is improved.

Description

Technical field [0001] The present invention relates to heavy metal pollution control and solid waste treatment technology, and is specifically a method of curing arsenic with a multivariate solid waste polymer with red mud-tochole. Background technique [0002] Red mud, 高, blast furnace slag, desulfurization gypsum belong to industrial curvas, these solid waste is very large, due to solid waste contained heavy metals, harmful elements, if it is not possible to remove or stabilize, it is used to develop other products Large limit. The comprehensive utilization rate of domestic redischers is less than 1%, and the red mud disposal method is still mainly in the dam stack. As the national environmental protection requirements are increasing, the comprehensive utilization of solid waste resources is imperative. [0003] Toxic sand is a highly presence of highly presence in a natural environment. During the development of non-ferrous metal minerals, with other minerals, with mallings, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/10C04B18/04C04B18/14C04B22/14
CPCC04B28/006C04B18/0409C04B14/106C04B18/142C04B22/145C04B18/0463C04B2111/00724C04B2201/50C04B22/064C04B22/062Y02W30/91Y02P40/10
Inventor 张正富周娴杨会王劲松陈满骄道娟叶
Owner KUNMING UNIV OF SCI & TECH
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