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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

Active Publication Date: 2020-10-16
ZIJIN MINING GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wastewater treated by solvent extraction often fails to meet discharge standards and requires advanced treatment
In the traditional process, limestone + lime neutralization treatment is widely used because of its low cost, but this process not only causes economic losses due to the lack of recycling of heavy metal ions during the neutralization process, but also has a large water content and a large amount of water in the neutralization slag. Heavy metals are directly stored in mines, causing secondary pollution. A large amount of neutralized slag is stored in a special warehouse, which increases production costs and wastes valuable land resources.

Method used

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  • Method for comprehensively utilizing multi-metal acidic wastewater of non-ferrous metal mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a method for the comprehensive utilization of polymetallic acid wastewater from non-ferrous metal mines, such as figure 1 As shown, it specifically includes the following steps:

[0027] S1, reducing acid to prepare calcium sulfate whiskers:

[0028] Calcium carbonate is added to the acid waste water to reduce the acid, and after thickening, a polymetallic acidic solution A (filtrate) and gypsum slurry (filter residue) containing copper, iron, zinc, and aluminum will be produced; the amount of calcium carbonate added is 0.8% of the theoretical amount of acid neutralization. -1.2 times; pump the gypsum slurry into the reactor for crystal transformation reaction, add water to the reactor according to the mass ratio of gypsum slurry and water of 1:7-35, and add crystal modifier, during the reaction React for 60-180min under the technological conditions of temperature 90-140℃ and stirring speed 150-180rpm, then perform flash evaporation and separat...

Embodiment 2

[0038] Acidic pit water produced during the mining process of a polymetallic sulfide mine, containing 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) Calcium sulfate whisker is prepared by reducing acid: measure 10 liters of acid waste water in the reaction tank, add 110g limestone (CaCO in limestone) under normal temperature stirring condition 3 The content is 94wt%, the same below) for neutralization, stirring and reacting for 20min, and the end point pH=2.25. After the reaction is finished, filter to obtain a polymetallic acidic solution A (filtrate) containing copper, iron, zinc and aluminum and gypsum slurry. Put all the gypsum slurry into the reaction kettle, add water to the reaction kettle according to the ratio of gypsum slurry and water quality of 1:9, add 0.08wt% sodium nitrate, and mix the mixture at a reaction temperature ...

Embodiment 3

[0050] The quality of the acid pit water produced in the mining process of a certain 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 for 20 minutes, and the final pH is 2.25. After the reaction is finished, filter to obtain a polymetallic acidic solution A containing copper, iron, zinc and aluminum and gypsum slurry. Put all the gypsum slurry into the reaction kettle, add water into the reaction kettle according to the ratio of gypsum slurry and water quality of 1:7, add 0.02wt% sodium nitrate, at the reaction temperature of 140°C and the stirring speed of 150rpm The crystal transformation reaction is carried out for 60 minutes under the technological conditions, followed by flash evapor...

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Abstract

The invention discloses a method for comprehensively utilizing multi-metal acidic wastewater of non-ferrous metal mine, which realizes recovery of sulfate radicals in the acid wastewater and production of calcium sulfate whiskers by neutralizing and controlling the acidity of the solution so as to realize high value of products. Ferric hydroxide and gypsum generated in the neutralization process are efficiently separated in a physical mode, ferric hydroxide slag and gypsum products are obtained, reduction of the neutralization slag is achieved, and high-valued utilization is achieved. Copper,zinc and aluminum products are selectively separated and recycled through a stepped precipitation method, so that the recovery rates of copper, zinc and aluminum are larger than or equal to 90%, larger than or equal to 95% and larger than or equal to 85% respectively, resource utilization of valuable metal is achieved, and the problems of resource waste of a traditional neutralization process andsecondary pollution to the environment in neutralization slag stockpiling are solved.

Description

technical field [0001] The invention relates to the technical field of reducing pollution and improving comprehensive utilization of waste water resources, in particular to a method for comprehensive utilization of polymetallic acid waste water in nonferrous metal mines. Background technique [0002] Low-grade non-ferrous metal mines usually use sulfuric acid / bioleaching-extraction-electrowinning to extract valuable metals in the ore. A large amount of copper, iron, aluminum, zinc, cobalt, nickel and other metal ions enter the acidic wastewater in the leaching and extraction process. The content of sulfuric acid in acid wastewater is as high as 5-15g / L, and the content of iron is as high as 7-15g / L. Compared with them, the content of valuable metal elements such as copper, zinc, cobalt, and nickel is low, only 100-500mg / L. This kind of mine acid wastewater has the characteristics of high acidity, many types of heavy metals, complex properties, etc. It is harmful to the envir...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01F11/46C01G49/02C01G9/08C01G3/12C01F7/02C02F103/16C02F101/20
CPCC02F9/00C01F11/46C01G49/02C01G9/08C01G3/12C01F7/02C02F2103/16C02F2101/20C02F2101/203C02F2001/007C02F1/66C02F1/58
Inventor 伍赠玲邹来昌季常青许涛王弘傅福金庄荣传王乾坤黄中省
Owner ZIJIN MINING GROUP
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