Tailing recycling and harmless treatment method

A harmless treatment and recycling technology, applied in the direction of alkali metal silicate, silicate, etc., can solve the problems of heavy metals and complex tailings components, and achieve the effect of less environmental pollution and the realization of feasibility

Inactive Publication Date: 2021-03-12
肇庆市武大环境技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silica-alumina tailings contain a large amount of silicon oxides. If silica-alumina tailings can be used instead of quartz to produce sodium silicate, to a certain extent, the source of raw materials can be expanded, and at the same time, the silica-alumina tailings can be processed Resource utilization can achieve effective disposal of "resource" and "reduction" of tailings, but the composition of tailings is complex and contains heavy metals, so far there is no good way to replace industrial sodium salt and quartz with tailings. Sodium silicate related methods, so the development of a method of using tailings to prepare sodium silicate is of great significance for improving the mine environment and the secondary utilization of tailings resources

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] In this embodiment, the mineral processing tailings of a tin ore dressing field in Guangxi Zhuang Autonomous Region are collected as raw materials, and the chemical composition of the mineral processing tailings is as shown in Table 1:

[0021] Table 1 Chemical composition and content of beneficiation tailings

[0022] chemical composition SiO 2

Al 2 o 3

FeO CaO MgO As 2 o 3

PbO other Content / wt.% 65.12 4.57 10.03 5.65 3.21 1.04 0.25 10.13

[0023] Grind the tailings in the above Table 1, and collect the tailings smaller than 200 mesh. According to the mass ratio of grinding tailings: sodium hydroxide: distilled water = 1:1.5:30, mix in a 1L reactor and heat at a constant temperature at 180°C for 4 hours; after the reaction is completed, pass the reaction solution through a mesopore filter Cloth for filtration, and then centrifuged through a centrifuge to collect the supernatant, and at the same time collect the...

Embodiment 2

[0026] In this embodiment, the mineral processing tailings of a tin ore dressing field in Guangxi Zhuang Autonomous Region are collected as raw materials, and the chemical composition of the mineral processing tailings is as shown in Table 1:

[0027] Table 1 Chemical composition and content of beneficiation tailings

[0028] chemical composition SiO 2

Al 2 o 3

FeO CaO MgO As 2 o 3

PbO other Content / wt.% 65.12 4.57 10.03 5.65 3.21 1.04 0.25 10.13

[0029] Grind the tailings in the above Table 1, and collect the tailings smaller than 200 mesh. According to the mass ratio of grinding tailings: sodium hydroxide: distilled water = 1:2:20, mix in a 1L reactor, and heat at a constant temperature for 2 hours under stirring at 230°C; after the reaction is completed, pass the reaction solution through a mesopore filter Cloth for filtration, and then centrifuged through a centrifuge to collect the supernatant, and at the same ti...

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Abstract

The invention discloses a tailing recycling and harmless treatment method, and the method comprises the following steps: putting tailings, a sodium-containing alkaline compound and a water medium intoa sealed reaction kettle for hydrothermal reaction, performing solid-liquid separation on the hydrothermal reaction product, concentrating the obtained liquid phase to obtain a sodium silicate product, and performing high-temperature treatment on the obtained solid phase to stabilize heavy metals. The method not only realizes efficient recovery of silicon resources in the tailings, but also realizes stabilization treatment of heavy metals in the tailings, and can be popularized and applied on a large scale.

Description

technical field [0001] The invention relates to a tailings disposal method, in particular to a method for recycling silicate resources in siliceous tailings containing heavy metals and harmless treatment of heavy metals, which belongs to the comprehensive utilization of solid waste resources in mining and metallurgy and the environmental restoration technology field. Background technique [0002] There are many mining enterprises in our country, more than half of which are silicon-aluminum tailings. Most of the silica-alumina tailings are stored in the tailings pond for a long time due to limited secondary resource utilization. In addition, their fine particle size, complex composition, and more or less heavy metal elements have a huge impact on the surrounding ecological environment. The threat has always been the focus of the government and various enterprises. Therefore, resource utilization and harmless disposal of tailings have great practical significance. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32C04B28/26C04B40/02
CPCC01B33/32C04B28/26C04B40/0268C04B2111/00784
Inventor 侯浩波张鹏举叶非华韩旭纪建业江俊锋李银生孙琪
Owner 肇庆市武大环境技术研究院
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