Method for removing soluble silicon dioxide in scheelite beneficiation wastewater

A mineral processing wastewater and silica technology, applied in mining wastewater treatment, chemical instruments and methods, multi-stage water treatment, etc., can solve problems such as high content of soluble silica, removal of soluble silica, impact of wastewater reuse, etc. , to achieve the effect of saving mineral processing cost, solving refractory treatment, and high wastewater reuse rate

Pending Publication Date: 2021-09-21

CHANGSHA RES INST OF MINING & METALLURGY

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AI-Extracted Technical Summary

Problems solved by technology

At present, when most mineral processing plants process scheelite mineral processing wastewater, they directly add lime to clarify the slurry, or continue to add flocculants for subsequent settlement. Although most of the soluble matter is settled, this method is difficult. The effective removal of soluble silica requires further advanced treatment, and the high content ...

Abstract

The invention discloses a method for removing soluble silicon dioxide in scheelite beneficiation wastewater. The method comprises the following steps: (1) adding lime into scheelite beneficiation wastewater to be treated, stirring, and carrying out coagulating sedimentation to obtain first supernate; (2) adding calcium chloride into the first supernate obtained in the step (1), stirring and dissolving, adjusting the supernate to be strongly alkaline, enabling the pH to be 11-13, stirring, standing and precipitating to obtain second supernate; and (3) adjusting the pH value of the second supernate in the step (2) to be neutral to obtain the treated water without soluble silicon dioxide. The method firstly adds the lime into the scheelite beneficiation wastewater to coagulate and settle most soluble silicon dioxide and suspended solids in the wastewater, then adds the calcium chloride into supernate water, and adjusts the pH value of the supernate water to further settle the residual soluble silicon dioxide and the difficult-to-settle fine suspended particles in the wastewater, so that the efficient removal of soluble silicon dioxide in the wastewater is realized.

Application Domain

Waste water treatment from quariesMultistage water/sewage treatment +2

Technology Topic

Treatments waterEnvironmental chemistry +8

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Examples

Experimental program(2)

Example Embodiment

[0028] Example 1 :( laboratory simulation and mineral processing water samples back experimentally)

[0029] The method of removing waste mineral scheelite a soluble silica of the present invention, comprising the steps of:

[0030] (1) analog formulated water sample containing soluble silica is sodium silicate, wherein the soluble SiO 2 Concentration controlled at about 400mg / L;

[0031] (2) The amount of lime per cubic wastewater in an amount of 500g, lime is added to the water samples the analog stirred 3min, 30min to obtain a first supernatant after settling;

[0032] (3) addition of 200g / m to the first supernatant 3 Calcium chloride, 2min after stirring the pH adjusted to 12 by adding sodium hydroxide, stirring for 2min settling 30min, to obtain a second supernatant;

[0033] (4) H 2 SO 4 The second supernatant was adjusted to a neutral pH to give the final treated water sample, a detection result of the water quality of the various stages shown in Table 1; and finally the various stages of processing water samples tungsten ore flotation open validation tests, laboratory do comparison water, waste water treatment mineral water indicators and laboratory indices comparable metallurgical performance is better than before wastewater treatment, mineral processing test results are shown in table 2.

[0034] Table 1 Soluble SiO 2 Analog processing stages each water sample water analysis

[0035]

[0036] Table 2 Soluble SiO 2 Flotation open simulation results before and after the test water sample /%

[0037]

[0038]

Example Embodiment

[0039] Example 2 (Xintianling dressing wastewater treatment and reuse Tungsten test) Embodiment:

[0040] Scheelite removing one inventive dressing wastewater in the process (Xintianling tungsten ore beneficiation waste water) soluble silica, comprising the steps of:

[0041] (1) in accordance with an amount of lime per cubic meter of waste water in an amount of lime added to 600g of tungsten ore dressing wastewater stirred 5min, 40min to obtain a first supernatant after settling;

[0042] (2) was added 200g / m to the first supernatant 3 Calcium chloride, and the pH adjusted to about 12, a white precipitate was stirred 2min, sedimentation 30min, to obtain a second supernatant;

[0043] (3) H 2 SO 4 The second supernatant was adjusted to neutral pH, to obtain water samples (each stage of the processing and beneficiation waste water analysis As shown in Table 3) after the treatment process; various stages of processing of the last water samples scheelite flotation open validation tests, laboratory water do comparison, the waste water treatment mineral water indicators and laboratory indices comparable metallurgical performance is better than before wastewater treatment, mineral processing test results are shown in table 4.

[0044] Table water each processing stage 3 Xintianling tungsten ore beneficiation waste water analysis

[0045]

[0046] Table flotation beneficiation waste water treatment before and after the open circuit test result of 4 Xintianling Tungsten /%

[0047]

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve the separation effect
Simple processing

Method for removing soluble silicon dioxide in scheelite beneficiation wastewater

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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