A method for synchronously purifying arsenic ions and fluorine ions in industrial wastewater by stripping waste rocks from mining
A technology of industrial wastewater and fluorine ions, applied in the field of resources and environment, can solve the problems of complicated process and difficult fluorine discharge standards, and achieve the effects of simple process, low treatment cost and reduced risk of environmental pollution
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Embodiment 1
[0026] Example 1: In this example, dolomite-type mining stripping waste rock is used to remove arsenic and fluoride ions in mineral processing wastewater.
[0027] The tailings wastewater produced by a lead-zinc beneficiation plant in Guangxi contains 0.30 mg / L arsenic and 3.3 mg / L fluorine, and the pH of the wastewater is neutral. Dolomite is used as an adsorbent to reduce the content of arsenic and fluorine in wastewater. After analysis, the main component of waste rock in the mining area is dolomite. The specific steps for removal are as follows:
[0028] (1) The waste rock is crushed and ground to a particle size of less than 1 mm by mass;
[0029] (2) Add 0.5mol / L KOH to 0.6mol / L FeCl 3 solution and mechanically stirred for 1h to mix evenly, wherein, KOH solution and FeCl 3 The volume ratio of the solution is 5:1, and then aged at 25°C for 2 days to prepare the hydroxyl iron pillar solution;
[0030] (3) Add the waste rock after crushing and grinding in step (1) to the...
Embodiment 2
[0034] Embodiment 2: In this embodiment, arsenic and fluoride ions in mineral processing wastewater are purified by using chlorite-type layered mining stripping waste rocks.
[0035] The waste rock stripped by a mining company in Yunnan mainly contains chlorite and a small amount of quartz. The wastewater generated on site is neutral, containing 0.62 mg / L and 4.2 mg / L of arsenic and fluorine respectively. The specific steps for removal are as follows:
[0036] (1) Ore crushing by crusher-grinding machine, and the particle size range of waste rock is controlled at -0.074mm~+0.037mm;
[0037] (2) Add 0.10mol / L NaOH to 0.2mol / L Al 2 (SO 4 ) 3 solution and stirred for 2h to mix evenly, among them, NaOH solution and Al 2 (SO 4 ) 3 The volume ratio of the solution is 2:1, and then aged at 23° C. for 1 day to prepare a hydroxyaluminum pillaring liquid;
[0038] (3) Add the waste rock after crushing and grinding in step (1) to the aged aluminum hydroxy propping solution in step...
Embodiment 3
[0042] Embodiment 3: In this embodiment, chlorite-type mining stripping waste rocks are used to purify the acidic arsenic-containing and fluorine-containing waste water produced in the mining area of the mine.
[0043] A polymetallic mine in Hunan produced a large amount of acidic wastewater during the mining process, with a pH of 2 to 4, and the content of arsenic and fluorine in the solution was as high as 0.73mg / L and 5.4mg / L. In order to purify the water quality, the "neutralization-waste rock adsorption" process is adopted on site for treatment. The main components of the waste rock produced by the self-stripping process in the mining area are quartz and chlorite. The specific steps for removal are as follows:
[0044] (1) The waste rock is crushed and ground to a particle size of less than 2mm by mass;
[0045] (2) Add 1mol / L KOH to 1mol / L FeCl 3 solution and mechanically stirred for 4h to mix evenly, wherein, KOH solution and FeCl 3 The volume ratio of the solution...
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