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Efficient flocculent precipitate purification method for polymetallic ore benefication wastewater

A technology for beneficiation wastewater and polymetallic ore, which is applied in flocculation/sedimentation water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. and other problems, to achieve the effect of good flocculation and sedimentation, rapid separation of mud and water, and compact and stable flocs.

Active Publication Date: 2012-10-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the mineral processing wastewater of polymetallic minerals, such as mineral processing enterprises with tungsten, molybdenum, bismuth, pyrite, fluorite and other valuable minerals, the mineral processing process is complicated, the flotation reagents are diverse, the discharge of mineral processing wastewater is large, and the wastewater of each process After mixing, the components are complex. During the treatment process using lime neutralization method and other technologies, there are poor flocculation and sedimentation effects and difficulties in separating mud and water. Directly affect the flotation efficiency and concentrate grade and other issues, resulting in generally low or even seldom reuse of treated wastewater

Method used

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  • Efficient flocculent precipitate purification method for polymetallic ore benefication wastewater
  • Efficient flocculent precipitate purification method for polymetallic ore benefication wastewater
  • Efficient flocculent precipitate purification method for polymetallic ore benefication wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The tungsten-bismuth beneficiation wastewater was treated with polysilicate aluminum ferric sulfate flocculants with different ratios.

[0025] Dilute water glass to SiO 2 The mass percentage is 7%, slowly added to the rapidly stirred dilute H 2 SO 4 In the solution, the pH value is controlled to be 3~3.5. After polymerizing for a period of time at room temperature, a certain amount of aluminum sulfate octadecahydrate is added therein, and stirred rapidly to make it fully polymerized; subsequently, a certain amount of ferrous sulfate heptahydrate is dissolved in dilute H 2 SO 4 The oxidized solution in the solution is quickly mixed with the above-mentioned solution at 40-60°C, kept at the temperature for polymerization for a period of time, diluted with distilled water until the total Fe concentration is 0.15mol / L, and the polysilicate aluminum ferric sulfate flocculant ( figure 1 ).

[0026] SiO in retaining flocculant 2 Mass percentage=0.5%~5%, the ratio of the ...

Embodiment 2

[0028] Treatment of tungsten-bismuth beneficiation wastewater with polysilicate aluminum iron sulfate flocculant.

[0029]According to the preparation method of the polysilicate aluminum ferric sulfate flocculant in Example 1, the polysilicate aluminum ferric sulfate flocculant was obtained. Add 20.25, 40.5, 60.75, 81, 101.25 mg / L in sequence to the tungsten-bismuth mineral processing wastewater with pH 7.83, COD 280 mg / L, turbidity 7175 NTU, and concentrations of heavy metals As, Be, and Pb respectively 0.92, 0.49, and 5.78 mg / L (Based on the concentration of aluminum in the flocculant in wastewater) polysilicate aluminum ferric sulfate flocculant, stir rapidly at a speed of 200r / min for 1.5min, then stir slowly at a speed of 40r / min for 15min, and take the supernatant after standing for 30min to test. The test results showed that ( image 3 ), when 60.75mg / L (based on the concentration of aluminum in the flocculant in the wastewater) polysilicate aluminum iron sulfate floc...

Embodiment 3

[0031] Tungsten-bismuth beneficiation wastewater was treated by two-stage flocculation-sedimentation of polysilicate aluminum ferric sulfate and polyacrylamide.

[0032] According to the preparation method of the polysilicate aluminum ferric sulfate flocculant in Example 1, the polysilicate aluminum ferric sulfate flocculant was obtained. In the tungsten-bismuth beneficiation wastewater with a pH of 7.83, a COD of 280mg / L, a turbidity of 7175NTU, and concentrations of heavy metals As, Be, and Pb of 0.92, 0.49, and 5.78mg / L, add 60.75mg / L to the wastewater (based on the concentration of aluminum in the flocculant in wastewater) polysilicate aluminum ferric sulfate flocculant; stir rapidly at a speed of 200r / min for 1.5min, then add polyacrylamide to make its concentration in wastewater reach 2.5mg / min L; after settling for 5 minutes, the residual turbidity is 198 NTU; after 15 minutes, the residual turbidity is 89 NTU. After SV30 evaluation (the mixed solution was placed in a ...

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Abstract

The invention discloses an efficient flocculent precipitate purification method for polymetallic ore benefication wastewater. Specifically, the purification method comprises the steps of: neutralizing and regulating the pH value of benefication wastewater by adopting a little amount of alkaline materials; then sequentially feeding a proper amount of proper suitable flocculant for efficient flocculation and a little amount of efficient coagulant aids for fast precipitation; separating sludge from water through action of a partition wall, wherein the treated wastewater achieves primary standardof national Integrated wastewater discharge standard (GB8978-1996); through SV30 evaluation; settling for 5minutes to achieve 45-55mL of supernatant by volume; and settling for 15 minutes to achieve 70-80mL of supernatant by volume. The purification method can fully utilize the traditional benefication wastewater lime and sedimentation process, is simple in procedure, and can simultaneously remove suspended particulate matters, organic matters and heavy metal ions in wastewater, is high in flocculation efficiency and fast in sedimentation speed, and can better solve the purification problem of the low-concentration and high-tubidity polymetallic ore benefication wastewater of multiple heavy metals.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and relates to a method for treating low-concentration and high-turbidity polymetallic ore dressing wastewater of heavy metals by using a suitable flocculant and a coagulant aid for two-stage flocculation precipitation, and stably discharges or reaches reuse standards after treatment. Background technique [0002] The waste water in the beneficiation process mainly comes from the three sections of ore washing, crushing and sorting. The separation process of ore mainly includes gravity separation, flotation and magnetic separation. According to statistics, it takes 4~7m of water to process 1 ton of ore by flotation. 3 , using the gravity separation method requires water consumption of 20~26m 3 , using the flotation-magnetic separation method requires water consumption of 23~27m 3 , the gravity-flotation method needs water consumption of 20~30m 3 . Excluding the amount of recycle...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52
Inventor 郭朝晖袁珊珊肖细元
Owner CENT SOUTH UNIV
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