Method for comprehensively utilizing multi-metal acidic wastewater of non-ferrous metal mine
A technology for acidic wastewater and non-ferrous metals, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, and water pollutants. , to avoid waste of resources, to achieve the effect of reduction
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[0025] Example 1
[0026] This embodiment provides a method for comprehensive utilization of polymetallic acid wastewater from a non-ferrous metal mine, such as figure 1 As shown, it specifically includes the following steps:
[0027] S1. Preparation of calcium sulfate whiskers by reducing acid:
[0028] Calcium carbonate is added to acidic wastewater to reduce acidity. After thickening, a polymetallic acid solution A (filtrate) and gypsum slurry (filter residue) containing copper, iron, zinc and aluminum will be produced; the addition of calcium carbonate is 0.8 of the theoretical amount of acid neutralization -1.2 times; the gypsum slurry is pumped into the reaction kettle to carry out the crystal conversion reaction, and water is added to the reaction kettle according to the mass ratio of gypsum slurry and water of 1:7-35, and the crystal conversion agent is added. The temperature is 90-140℃ and the stirring speed is 150-180rpm for 60-180min, then flashed, separated, and dried t...
Example Embodiment
[0037] Example 2
[0038] The acid pit water produced in the mining process of a polymetallic sulfide mine contains H 2 SO 4 10g / L, Cu 2+ 0.37g / L, Zn 2 + 0.27g / L, Al 3+ 1.6g / L, TFe 7.2g / L, Fe 3+ 6.6g / L, SO 4 2- 30-35g / L, pH=1.35.
[0039] The main implementation steps are as follows:
[0040] (1) Preparation of calcium sulfate whiskers by acid reduction: Measure 10 liters of acidic wastewater into the reaction tank, and add 110 g of limestone (CaCO in limestone) under stirring at room temperature. 3 The content is 94wt%, the same below) neutralize, stir and react for 20 minutes, and the end pH=2.25. After the reaction, it is filtered to obtain a polymetallic acid solution A (filtrate) containing copper, iron, zinc, and aluminum and gypsum slurry. Transfer all the gypsum slurry into the reaction kettle, add water to the reaction kettle at a ratio of 1:9 by the mass of the gypsum slurry and water, add 0.08wt% sodium nitrate, at a reaction temperature of 135°C and a stirring speed of 1...
Example Embodiment
[0049] Example 3
[0050] The quality of the acidic pit water produced in the mining process of a polymetallic sulfide mine is the same as that of Example 1.
[0051] The main implementation steps are as follows:
[0052] (1) Preparation of calcium sulfate whiskers by reducing acid: Measure 10 liters of acidic wastewater into the reaction tank, add 110 g of limestone under normal temperature stirring conditions for neutralization, stir and react for 20 minutes, and the end pH is 2.25. After the reaction, it is filtered to obtain a polymetallic acid solution A containing copper, iron, zinc and aluminum and a gypsum slurry. Transfer all the gypsum slurry into the reaction kettle, add water to the reaction kettle at a ratio of 1:7 by mass of the gypsum slurry and water, add 0.02wt% sodium nitrate, and set the reaction temperature at 140°C and stirring speed of 150rpm. Under the process conditions, the crystallization reaction is carried out for 60 minutes, and then flashed, separated,...
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