CN102600980A - Recycling method for mineral processing waste water with high leaching residue content in zinc hydrometallurgy - Google Patents

Abstract

The invention discloses a method for recycling zinc-smelting high leaching slag beneficiation waste water in a wet process. The invention utilizes P ₂₀₄ to extract the relative zinc-containing solution for extraction, and utilizes the electrolytic waste liquid in the zinc smelting electrolysis system to extract P ₂₀₄ in an organic reverse extraction , so that the P ₂₀₄ extracts the zinc in the organic phase into the electrolytic waste liquid, and the stripping liquid is returned to the hydrometallurgy zinc leaching system after deoiling. The present invention adds zinc sulfide concentrate to the mineral processing wastewater with a content of more than 200 mg/L mineral processing agent after filtration and stirs for primary adsorption. The zinc sulfide concentrate can effectively absorb the black drug in the mineral processing wastewater and can remove excessive Many dressing agents. The metal zinc recovered by the invention can be conveniently used in existing facilities, and the stripping solution can be directly returned to the zinc hydrometallurgy leaching system after deoiling, the process is pollution-free, and the amount of recyclable zinc metal is increased, which has better economic benefits.

Description

Recycling method of beneficiation wastewater with high leaching slag in zinc hydrometallurgy

technical field

The invention belongs to the recycling method of ore dressing wastewater in hydrometallurgy, in particular to the recycling method of hydrometallurgy zinc high leaching slag ore dressing wastewater.

Background technique

In the zinc hydrometallurgy process, a large amount of high leaching slag is produced every year. The high leaching slag contains silver, zinc, lead, copper and other valuable metals. Valence metals are recovered by flotation process. In the flotation process, a large amount of beneficiation wastewater will be produced. Through the laboratory analysis of the beneficiation wastewater, the zinc content in the beneficiation wastewater is 16g/l-18g/l, which is relatively high and has recovery value. In the prior art, the mineral processing wastewater is sent to the sewage treatment station for neutralization treatment before recycling, but this method in the prior art will not only cause the loss of zinc in the mineral processing wastewater, but also increase the processing cost of the mineral processing wastewater .

Mineral dressing wastewater contains a large amount of mineral dressing reagents. In the prior art, only activated carbon is used to adsorb mineral dressing reagents. However, when the mineral dressing wastewater contains more than 200mg/L of mineral dressing reagents, the adsorption effect of activated carbon is not ideal. How to provide a new adsorbent, which can better absorb the redundant mineral processing agents in the mineral processing wastewater, will make the zinc recovery rate of the mineral processing wastewater higher.

Contents of the invention

In order to overcome the deficiencies in the prior art, the present invention provides a low-cost, high zinc recovery rate recycling method for the high leaching slag beneficiation wastewater of zinc smelting.

The present invention is achieved through the following technical solutions: a recycling method for zinc hydrometallurgy high leaching slag beneficiation wastewater, which comprises the following steps:

a. First, filter the mineral processing wastewater so that the solid particle content in the mineral processing wastewater is less than 10 ppm;

b. Add zinc sulfide concentrate to the mineral processing wastewater with a concentration of mineral processing agents exceeding 200mg/L after filtration, and stir for primary adsorption to remove the mineral processing agents in the mineral processing wastewater;

c, and then undergo activated carbon adsorption treatment to further remove the beneficiation agent in the beneficiation wastewater;

D, use P ₂₀₄ extractant to carry out extraction treatment in extraction tank to the zinc-containing solution after zinc sulfide concentrate and active carbon adsorption;

E, add a small amount of caustic soda during the extraction process to adjust the extraction rate as required to form P ₂₀₄ extract the organic phase and raffinate;

f, using the electrolytic waste liquid in the zinc smelting electrolysis system to carry out stripping treatment to the P ₂₀₄ extraction organic phase, so that the zinc in the P ₂₀₄ extraction organic phase enters the electrolytic waste liquid to form a back extraction liquid;

g. The back-extraction liquid that has undergone back-extraction treatment is returned to the zinc leaching system after deoiling treatment;

h. After the extraction treatment, the raffinate is deoiled and then sent to the flotation beneficiation system for slurry adjustment. During the slurry adjustment process, lime is added to neutralize the excess acid;

i. The beneficiation wastewater discharged from the flotation beneficiation system enters the wastewater filter tank, and the beneficiation wastewater is recycled.

The beneficiation agent is black medicine and foaming agent. There are many foams in the concentrate slurry, and there are relatively more beneficiation agents. After filtering, this part of the beneficiation wastewater is directly injected into the beneficiation slurry mixing system, and does not enter the extraction system, so as to reduce the high concentration of beneficiation agents. The beneficiation wastewater enters the extraction system.

Reasonable design of extraction tanks, reduction of entrainment, addition of secondary clarification tanks, and extension of clarification time are the main measures to reduce the organic phase from entering the leaching process. When iron has accumulated to a certain extent in the organic phase, it is necessary to back-extract the iron from the organic phase with hydrochloric acid solution to regenerate the organic phase.

The present invention uses P ₂₀₄ to extract relative to the zinc-containing solution for extraction, and uses the electrolytic waste liquid in the zinc smelting electrolysis system to extract P ₂₀₄ in an organic reverse extraction, so that the zinc in the organic phase extracted by P ₂₀₄ enters the electrolytic waste liquid, and the stripping liquid is stripped. The oil is then returned to the hydrometallurgy zinc leaching system. The organic phase is recycled, and the raffinate is deoiled and then returned to the flotation beneficiation system for slurry preparation.

The beneficial effects of the present invention are: the present invention adds zinc sulfide concentrate to the mineral processing wastewater with a content of more than 200 mg/L of mineral processing agents after filtration and stirs for primary adsorption, and the zinc sulfide concentrate can effectively absorb the black drug in the mineral processing wastewater, It can remove excessive mineral processing agents in the mineral processing wastewater. The present invention can further improve the comprehensive recovery level of the enterprise, and the recovered metal zinc can be conveniently used in existing facilities, and the stripping solution can be directly returned to the zinc hydrolysis electrolysis system after deoiling, and the process is pollution-free, increasing energy efficiency. Recovering the amount of zinc metal has good economic benefits. The process technology of the invention is mature, the effect of recovering zinc is good, and the cost is low. After the raffinate is deoiled, it can be returned to the flotation beneficiation system for pulping and reuse, and there is no waste water discharge.

Description of drawings

Fig. 1 is the extraction process flow chart of the recycling method of the zinc hydrometallurgy high leaching slag mineral processing wastewater of the present invention;

Fig. 2 is a schematic diagram of the material direction of the extraction system in the recycling method of the zinc hydrometallurgy high leaching slag ore dressing wastewater of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the recycling method of zinc hydrometallurgy high leaching slag ore dressing wastewater comprises the following steps: a, at first the ore dressing wastewater is filtered, so that the solid particle content in the ore dressing wastewater is less than 10ppm; b, after the process After filtration, the mineral processing wastewater with a mineral processing agent content exceeding 200mg/L is added with zinc sulfide concentrate and stirred for primary adsorption to remove the mineral processing agent in the mineral processing wastewater; c, and then undergo activated carbon adsorption treatment to further remove the mineral processing wastewater from the mineral processing wastewater medicament; d, use P ₂₀₄ extractant to extract the zinc-containing solution after zinc sulfide concentrate and activated carbon adsorption in the extraction tank; e, add a small amount of caustic soda in the extraction process to adjust the extraction rate as required to form P ₂₀₄ to extract the organic phase and raffinate; f, use the electrolytic waste liquid in the zinc smelting electrolysis system to carry out back extraction treatment to P ₂₀₄ to extract the organic phase, so that the zinc in the P ₂₀₄ extracted organic phase enters the electrolytic waste liquid to form a back extraction liquid; g. The back-extraction liquid that has undergone back-extraction treatment is returned to the zinc leaching system after deoiling; h. The raffinate that has been extracted is deoiled and then enters the flotation beneficiation system for pulping. During the pulping process, add Lime neutralizes excess acid; i. The beneficiation wastewater discharged from the flotation beneficiation system enters the wastewater filter tank, and the beneficiation wastewater is recycled.

As shown in Figure 2, the material flow of the extraction system in the recycling method of the zinc hydrometallurgy high leaching slag mineral processing wastewater of the present invention is as follows: the zinc-containing wastewater produced by the mineral processing system is sent to the extraction process, and enters the extraction system in the form of feed liquid, After extraction, the discharged raffinate is returned to the beneficiation system for use; the P _204- loaded organic phase after extraction is back-extracted with the electrolytic waste liquid produced in the electrolysis process. The blank organic phase obtained after extraction is returned to extraction for zinc extraction. The ultimate goal of this process is to use the extraction system as an intermediary to transfer the zinc in the beneficiation wastewater to the zinc leaching system. After the mineral processing wastewater goes to the additional extraction process, the overall process flow forms three closed cycles of the mineral processing system, the extraction system and the main system as shown in Figure 2.

Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent replacements to the technical solution of the present invention by those skilled in the art will not depart from the present invention. The essence and scope of the technical solution of the invention.

Claims (1)

1. the zinc hydrometallurgy height soaks the recycle method of slag beneficiation wastewater, it is characterized in that: said recycle method comprises the steps:

A, at first beneficiation wastewater is carried out filtration treatment, make solid content in the beneficiation wastewater less than 10ppm;

B, the beneficiation wastewater that surpasses 200mg/L through beneficiation reagent content after the filtration treatment is added zinc sulfide concentrates stir and carry out one-level absorption, remove the beneficiation reagent in the beneficiation wastewater;

C and then process charcoal absorption are handled, and further remove the beneficiation reagent in the beneficiation wastewater;

D, use P ₂₀₄Extractant is to carrying out extraction process through the zinc-containing solution after zinc sulfide concentrates and the charcoal absorption in extraction tank;

E, in extraction process, add a small amount of caustic soda,, form P to regulate extraction yield as required ₂₀₄Extracted organic phase and raffinate;

F, with the electrolysis waste solution in the zinc metallurgy electrolysis system to P ₂₀₄The extracted organic phase processing of stripping makes P ₂₀₄Zinc in the extracted organic phase gets into electrolysis waste solution and forms strip liquor;

Turn back to zinc metallurgy after g, the strip liquor of handling through stripping are handled through de-oiling and leach system;

H, handle the back through the raffinate of extraction process through de-oiling and get into the flotation beneficiation system usefulness of sizing mixing, add in the process of sizing mixing in the lime and unnecessary acid;

I, the beneficiation wastewater of discharging through the flotation beneficiation system get into the waste water filtering pond, and beneficiation wastewater carries out recycle again.

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