Scheelite beneficiation wastewater treatment technique

A technology for wastewater treatment and scheelite beneficiation, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of stable discharge, incomplete removal, and high operating costs. Achieve the effect of accelerating decomposition and sedimentation speed, stable treatment effect, and small footprint

Inactive Publication Date: 2012-12-19
中铝环保节能科技(湖南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned conventional treatment method can make the discharge of tailings water basically meet the discharge standard, but there are the following shortcomings: 1. It is difficult to reuse the treated effluent
Due to the incomplete removal of water glass and organic chemicals in the tailings wastewater, it affects the beneficiation index, and the treated water is difficult to reuse
2. Unable to meet emission standards stably
Due to atmospheric precipitation directly entering the tailings pond, the water quality index of the tailings pond drainage changes greatly, resulting in unstable water indicators of the treatment station, and it is difficult to discharge in a stable manner.
3. High operating costs
The dispersing effect of water glass makes the flocculation and settlement of tailings wastewater difficult. It is necessary to add lime milk to adjust the pH value above 11 and add a large amount of flocculant (>80mg / L). The pH value of the effluent needs to be adjusted, resulting in high operating costs for wastewater treatment.
In water-deficient areas, tailings water is reused for mineral processing, which makes the mineral processing enterprises pay the price of reducing the metal recovery rate, resulting in waste of resources, which is not conducive to energy conservation and environmental protection; in addition, the dispersion of water glass makes it difficult to flocculate and settle tailings wastewater. Dosing a large amount of flocculant, resulting in high cost of wastewater treatment

Method used

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  • Scheelite beneficiation wastewater treatment technique
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  • Scheelite beneficiation wastewater treatment technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 10,000 liters of scheelite beneficiation wastewater, the test data are shown in Table 1, the wastewater was directly electrolyzed to decompose water glass and organic chemicals, and the wastewater after primary treatment was obtained; coagulant aid (PAM) was added to the wastewater after primary treatment 150g, sedimentation removes water glass, obtains the waste water through secondary treatment; The detection data of the waste water through secondary treatment is shown in Table 1; Then in the waste water through secondary treatment, add oxygenant (H 2 o 2 ) 2.1kg, to fully oxidize the remaining organic matter in the water, and filter to obtain water return. The measured data of reused water is shown in Table 1, which exceeds the requirements of the first-level discharge standard of GB 8978-1996 "Integrated Wastewater Discharge Standard". The reclaimed water is used in the beneficiation process, which has the same effect as the use of fresh water for benefic...

Embodiment 2

[0018] Example 2 With the scheelite mineral processing wastewater in Example 1, 26 kg of coagulant (PAC) was added to the wastewater, and electrolysis was performed to decompose water glass and organic agents to obtain once-treated wastewater; in the once-treated wastewater Add 200g of coagulation aid (PAM), settle to remove water glass, and obtain secondary treated wastewater; the test data of the secondary treated wastewater is shown in Table 2; then add oxidant (H 2 o 2 ) 2.2kg, fully oxidize the remaining organic matter in the water, and filter to get back water (see process flow chart figure 1 ). The measured data of reused water is shown in Table 2, which exceeds the requirements of the first-level discharge standard of GB 8978-1996 "Integrated Wastewater Discharge Standard". The reclaimed water is used in the beneficiation process, which has the same effect as the use of fresh water for beneficiation, and does not affect the beneficiation index.

[0019]

[0020] ...

Embodiment 3

[0021] Example 3 10,000 liters of scheelite beneficiation waste water, 16.5 kg of coagulant (PAC) was added to the waste water, and electrolysis was carried out to decompose water glass and organic agents to obtain once-treated waste water; Add coagulant aid (PAM) 180g, settle to remove water glass, and obtain secondary treated wastewater; the test data of the secondary treated wastewater is shown in Table 2; then add oxidant (H 2 o 2 ) 2.3kg, to fully oxidize the remaining organic matter in the water, and filter to obtain water. The measured data of recycled water is shown in Table 3, exceeding the requirements of the first-level discharge standard of GB 8978-1996 "Integrated Wastewater Discharge Standard". The reclaimed water is used in the beneficiation process, which has the same effect as the use of fresh water for beneficiation, and does not affect the beneficiation index.

[0022]

[0023] Table 3 Detection data of scheelite beneficiation wastewater, secondary trea...

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Abstract

The invention relates to a scheelite beneficiation wastewater treatment technique which comprises the following steps: electrolyzing to remove most water glass and most organic reagents, adding a coagulant aid to precipitate so as to remove the water glass and organic reagents, and finally, adding an oxidizer to remove residual organic reagents in the wastewater. By using the technique provided by the invention, the removal rate of the water glass is higher than 94.5%, and the removal rate of the beneficiation organic reagents is higher than 98%; the quality of the effluent water is stable, and exceeds the requirements of GB8978-1996 'Sewage Comprehensive Discharge Standard' Grade 1; and the treated water can be reclaimed for the beneficiation technique. The technique provided by the invention has the advantages of stable treatment effect, high efficiency, short technical process, small occupied area, low cost, energy saving and environmental protection, and is simple to operate.

Description

technical field [0001] The invention relates to a process for treating scheelite beneficiation wastewater. Background technique [0002] Water glass is an inorganic colloid, which is the most commonly used inhibitor and dispersant in flotation operations. The existence of water glass makes it difficult to clarify the tailings water, and some refractory organic chemicals contained in the tailings water make it difficult to reuse the tailings water in the scheelite beneficiation industry. The beneficiation water consumption per ton of ore is about 4 tons. The concentration of water glass in the tailings wastewater of the scheelite beneficiation industry is above 2000mg / L, and the COD caused by other organic chemicals cr The concentration is generally above 200mg / L. The steps of the commonly used scheelite beneficiation wastewater treatment process are as follows: (1) Add lime milk to the tailings water, adjust the pH value to above 11.0, and then transport the tailings wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/10
Inventor 周前军李绪忠王水云卢丽
Owner 中铝环保节能科技(湖南)有限公司
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