Method for treating wastewater in lead-zinc ore dressing plant

The main sources of lead zinc ore dressing plant include dressing wastewater, tailings sediment. The dust generated by the crushing and screening workshop and the noise generated by large equipment such as crushing and grinding. For lead-zinc ore dressing plants, the pollution control of crushing and screening dust is usually good. In the design of the concentrator, a technical solution to solve the problem of excessive dust control was formulated. In the material crushing, the screening equipment can be equipped with a dust cover, and the dust discharge point is set at the blanking point of the mining equipment, and the dust is used by the air duct. The material is sucked to the dust collector for removal. There are not many ways to deal with broken and grinding noise. Only a single concentrator uses a rubber lining in the mill to reduce noise to a certain extent. Wastewater from lead-zinc mines is a major source of pollution, including wastewater from mining sites and wastewater from concentrators. The concentrator wastewater includes: tailing water, concentrate overflow water, accident water, plant washing water, and tailings reservoir permeate water.

There are different classification methods for wastewater treatment, but in principle, it can be divided into three categories: physical treatment, chemical treatment and biological treatment. Each category can be divided into several separation methods. The ore dressing wastewater treatment should be based on the water quality, water quantity and production process characteristics, and consider appropriate treatment technologies from the perspective of energy conservation and comprehensive recovery.

A neutralization method

The neutralization method uses an appropriate neutralizing agent and adjusts the pH to achieve an emission standard or a reuse index for the acidic or alkaline wastewater. And the pH was adjusted to an appropriate range, but also dissolved iron, aluminum, copper, zinc, manganese, cadmium and other metal ions in waste water, a hydroxide precipitate formed was removed. The neutralizing agent commonly used for acidic wastewater is slaked lime and limestone , which are cheap and have a rapid settling speed.

B oxidation method

The oxidation method is a treatment method that decomposes pollutants in water by an oxidation reaction to make them harmless. Commonly used oxidizing agents include active chlorine-based liquid chlorine, sodium hypochlorite, bleaching powder, and hydrogen peroxide, sodium persulfate, and ozone. The ore-containing wastewater containing cyanide wastewater and flotation reagents containing xanthate and sodium sulfide is commonly used in this method. In addition, the aeration method also utilizes oxidation, which obtains sufficient oxygen from the air to oxidize inorganic substances and organic substances in the water, and becomes harmful to be harmless.

In addition to the above two methods, the following measures are commonly used. (l) Increasing the tailings storage volume and increasing the inventory time can not only degrade chemical oxygen-consuming substances, but also reduce the amount of contaminated particles discharged from tailings water. (2) Improve the beneficiation process system and adopt a cyanide-free process to replace highly toxic or toxic agents with low-toxic or non-toxic agents. (3) Improve the return water utilization rate of the concentrator and reduce emissions.

Selective Laser Sintering

Selective Laser Sintering (SLS) was developed at the University of Texas in Austin, by Carl Deckard and colleagues. The technology was patented in 1989 and was originally sold by DTM Corporation. DTM was acquired by 3D Systems in 2001. The basic concept of SLS is similar to that of SLA. It uses a moving laser beam to trace and selectively sinter powdered polymer and/or metal composite materials into successive cross-sections of a three-dimensional part. As in all rapid prototyping processes, the parts are built upon a platform that adjusts in height equal to the thickness of the layer being built. Additional powder is deposited on top of each solidified layer and sintered. This powder is rolled onto the platform from a bin before building the layer. The powder is maintained at an elevated temperature so that it fuses easily upon exposure to the laser. Unlike SLA, special support structures are not required because the excess powder in each layer acts as a support to the part being built. With the metal composite material, the SLS process solidifies a polymer binder material around steel powder (100 micron diameter) one slice at a time, forming the part. The part is then placed in a furnace, at temperatures in excess of 900 °C, where the polymer binder is burned off and the part is infiltrated with bronze to improve its density. The burn-off and infiltration procedures typically take about one day, after which secondary machining and finishing is performed. Recent improvements in accuracy and resolution, and reduction in stair-stepping, have minimized the need for secondary machining and finishing.

The main material for the SLS are the metal part or Nylon material which are commonly used in the industry or consumer fields. contact us to do the business, we are your best partner from beginning to end to give you the best service.

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