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Low-cost method for solidifying arsenic by using multi-element solid waste cementing material for underground filling

A cementitious material and low-cost technology, which is applied in the field of multi-component solid waste cementitious materials for low-cost underground filling to solidify arsenic, can solve the problems of high processing cost, poor stability, and difficulty in large-scale application of live bacteria, and achieves a reduction in the amount of arsenic. and harmless disposal, the preparation process is simple, the effect of reducing diffusion and harm

Pending Publication Date: 2021-08-10
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common arsenic slag solid waste is treated by the calcium or iron chemical precipitation method formed in the arsenic-containing wastewater, but the arsenic-containing solid waste formed by it has poor stability, high treatment cost, and fails to meet the disposal standards required by environmental protection
Biodegradation also has problems such as difficult large-scale application of live bacteria and poor stability. Therefore, it is necessary to develop a method that can solve the above problems

Method used

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  • Low-cost method for solidifying arsenic by using multi-element solid waste cementing material for underground filling
  • Low-cost method for solidifying arsenic by using multi-element solid waste cementing material for underground filling
  • Low-cost method for solidifying arsenic by using multi-element solid waste cementing material for underground filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this example, metakaolin comes from a factory in Henan, and its main components are shown in Table 1; blast furnace slag comes from a smelter in Southwest China, and its main components are shown in Table 2; desulfurized gypsum comes from a smelter in Shandong, and its main components are shown in Table 3 Arsenopyrite comes from a mining area in Jiangxi, and its main components are as shown in Table 4;

[0048] Table 1 Metakaolin composition

[0049]

[0050] Table 2 Composition of blast furnace slag

[0051]

[0052] Table 3 Composition of desulfurized gypsum

[0053]

[0054] Table 4 Composition of arsenopyrite

[0055]

[0056] A method for solidifying arsenic with multiple solid waste cementitious materials for downhole filling at low cost, the specific steps are as follows:

[0057] (1) Grind cement, metakaolin, blast furnace slag, and desulfurized gypsum to 200 mesh respectively, dry in a drying oven at 105°C and sieve to obtain powder;

[0058]...

Embodiment 2

[0069] In this example, metakaolin comes from a factory in Henan, and its main components are shown in Table 1; blast furnace slag comes from a smelter in Southwest China, and its main components are shown in Table 2; desulfurized gypsum comes from a smelter in Shandong, and its main components are shown in Table 3 The arsenopyrite comes from a mining area in Jiangxi, and the main components are as shown in Table 4;

[0070] Table 1 Metakaolin composition

[0071]

[0072] Table 2 Composition of blast furnace slag

[0073]

[0074] Table 3 Composition of desulfurized gypsum

[0075]

[0076] Table 4 Composition of arsenopyrite

[0077]

[0078] A method for solidifying arsenic with multiple solid waste cementitious materials for downhole filling at low cost, the specific steps are as follows:

[0079] (1) Grind cement, metakaolin, blast furnace slag, and desulfurized gypsum to 200 mesh respectively, dry in a drying oven at 105°C and sieve to obtain powder;

[0...

Embodiment 3

[0091] In this example, metakaolin comes from a factory in Henan, and its main components are shown in Table 1; blast furnace slag comes from a smelter in Southwest China, and its main components are shown in Table 2; desulfurized gypsum comes from a smelter in Shandong, and its main components are shown in Table 3 The arsenopyrite comes from a mining area in Jiangxi, and the main components are as shown in Table 4;

[0092] Table 1 Metakaolin composition

[0093]

[0094] Table 2 Composition of blast furnace slag

[0095]

[0096] Table 3 Composition of desulfurized gypsum

[0097]

[0098] Table 4 Composition of arsenopyrite

[0099]

[0100] A method for solidifying arsenic with multiple solid waste cementitious materials for downhole filling at low cost, the specific steps are as follows:

[0101] (1) Grind cement, metakaolin, blast furnace slag, and desulfurized gypsum to 200 mesh respectively, dry in a drying oven at 105°C and sieve to obtain powder;

[0...

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Abstract

The invention discloses a low-cost method for solidifying arsenic by using a multi-element solid waste cementing material for underground filling, and belongs to the technical field of heavy metal pollution treatment and solid waste treatment. The method comprises the following steps: uniformly mixing cement, metakaolin, blast furnace slag and desulfurized gypsum to obtain a mixture A; and uniformly mixing the mixture A and arsenopyrite to obtain a mixture B, uniformly stirring the prepared sodium silicate excitant C and the mixture B to obtain a mixture D, pouring the mixture D into a mold, molding, demolding, and curing in a curing box for 28 days. The rich aluminosilicate cementing material is formed through full reaction of the multi-element solid waste, the cement and the sodium silicate exciting agent, the requirements for low leaching rate and strength of underground filling of heavy metal arsenic are met, and the purposes of green low-carbon, low-cost filling, short technological process, waste treatment with waste and arsenic solidification are achieved. The 7 d strength of the solidified body reaches 25 Mpa or above, the arsenic leaching concentration of the solidified body is less than 5 mg / L, and the solidified body can be used as a low-cost underground filling gelling agent for stably solidifying arsenic.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and heavy metal solidification, and in particular relates to a method for solidifying arsenic with a multi-component solid waste gelling material for underground filling at low cost. Background technique [0002] Metakaolin, blast furnace slag, and desulfurized gypsum are all industrial solid wastes. The amount of these solid wastes is huge. The stacking of these industrial wastes not only wastes a lot of land resources, but also causes serious environmental problems such as groundwater pollution and soil pollution. Metakaolin is a chemically active artificial pozzolan material calcined under appropriate temperature conditions. my country is rich in kaolin resources. The industrial solid waste blast furnace slag produced by non-ferrous metal smelters has potential active components, which can provide Ca, SiO2, Al2O3, etc. to promote the formation of hydrated calcium silicate and alum...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B40/02
CPCC04B28/144C04B2201/50C04B2111/00017C04B7/00C04B14/106C04B18/141C04B18/0463C04B22/00C04B22/062C04B40/0281
Inventor 周娴岳有成胥福顺包崇军张玮陈劲戈孙彦华周林冯炜光张辉汤皓元梁智崔健
Owner KUNMING METALLURGY INST
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