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A kind of scheelite beneficiation wastewater treatment process

A technology for scheelite beneficiation and wastewater treatment, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost, poor effect and high energy consumption

Active Publication Date: 2017-09-01
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high energy consumption, high cost and poor effect in the prior art scheelite beneficiation wastewater treatment process, the present invention proposes a scheelite beneficiation wastewater treatment process

Method used

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  • A kind of scheelite beneficiation wastewater treatment process
  • A kind of scheelite beneficiation wastewater treatment process
  • A kind of scheelite beneficiation wastewater treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of scheelite beneficiation wastewater treatment process, combined with figure 1 , the steps are:

[0042] A. Add lime to the scheelite beneficiation wastewater, and adjust the pH value to 11-12; adding lime milk can not only destroy the colloidal stability of the wastewater, but also precipitate and remove heavy metal ions in the wastewater at the same time; however, adding a large amount of lime Milk will cause the pH value to exceed the standard (pH value is about 12), and direct discharge may form a large amount of calcium-containing minerals in the river; the treated wastewater is used in scheelite beneficiation, and high pH value will also inhibit scheelite. In the flotation process of ore, the excess calcium ions contained will adsorb and activate gangue minerals, resulting in the consumption of a large amount of collectors in the flotation process. Adjusting the pH value will lead to the precipitation of silicic acid sol, and white flocculent sediments wi...

Embodiment 2

[0053] The wastewater from the tailings pond of a scheelite beneficiation enterprise is apparently clear, because the lime treatment is alkaline, and the pH value is 11-12. If it is directly discharged into the water body, a light yellow sedimentary pollution zone will quickly form downstream of the discharge outlet; if the current When the acid is added to adjust the pH value to 8-9, a large amount of flocculent floating matter will be formed tens of meters downstream of the discharge outlet; in order to reduce sewage discharge and improve the reuse rate of wastewater, the company reuses part of the tailings pond wastewater , but has a negative impact on the recovery rate of scheelite.

[0054] The discharge water samples were taken for detection and analysis, and the following results were obtained:

[0055] 1) The volatile organic compound VSS content of the flocs downstream of the discharge outlet is about 20%, indicating that the flocs are not formed by substances charact...

Embodiment 3

[0060] After the scheelite beneficiation wastewater has been treated with lime, coagulation sedimentation and plate and frame filtration, the main indicators have reached the discharge standard, but there will still be existing environmental impact problems. In view of the water quality characteristics of the effluent from the existing treatment process of scheelite beneficiation wastewater and the requirements for tail water reuse and discharge after treatment, the micro-flocculation filtration and micro-vortex reaction of special fillers for chemical precipitation are selected in combination with the technology of blowing off free carbon dioxide by wind to realize the removal of residual carbon dioxide. Removal of harmful mineral impurities.

[0061] The basic principles of the present invention are chemical precipitation, micro-flocculation filtration, micro-vortex reaction and wind blowing off: use sodium carbonate and PAM to chemically react with residual harmful mineral i...

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Abstract

The invention discloses a process for treating scheelite beneficiation wastewater, which belongs to the field of industrial wastewater treatment. The steps are as follows: A. Add lime to the scheelite beneficiation wastewater to adjust the pH value to 11-12; B. After destabilization and precipitation, separate the solid and liquid; C. Discharge the solid into the tailings pond, and the effluent enters the primary reaction tank , and add sodium carbonate; D, enter the secondary reaction tank, and add coagulant PAM to the secondary reaction tank, and carry out flocculation reaction with PAM; E, flow into the sedimentation tank by gravity, and the bottom concentrated sludge is discharged into the tailings pond; F, the supernatant enters the micro-flocculation filter, 5% of the effluent is discharged into the tailings pond as backwash water; G, 95% of the effluent is added with concentrated sulfuric acid to adjust the pH value to 6-9; H, the effluent enters the micro-vortex reaction tank, 5% of the effluent is discharged into the tailings pond as flushing water; 1. 95% of the effluent can be reused for scheelite beneficiation or directly discharged after the degassing tower removes carbon dioxide. It improves the reuse rate of scheelite beneficiation wastewater.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a process for treating scheelite beneficiation wastewater. Background technique [0002] Due to the addition of sodium silicate (commonly known as water glass, which is a commonly used inhibitor) in the scheelite flotation process, the fine particles in the pulp form a very stable colloidal dispersion system. The beneficiation wastewater contains a large amount of suspended solids that are difficult to settle, and has the physical and chemical characteristics of colloids. The colloidal particles are in a state of suspension and uniform distribution without being destroyed, and have stability. Colloids have sedimentation stability due to the fine dispersion of particles and the diffusion effect produced by Brownian motion against gravity. However, because the colloid is a multi-phase dispersion system, it has a large interphase interface and a huge free...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/10
Inventor 吴军李俊张浩然韩诚张艺邵川王敏刘佳诘
Owner NANJING UNIV
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