For nickel ore, strengthening comprehensive recycling and improving the utilization of “three wastes†are important measures to reduce environmental pollution and protect the environment. With the main source of nickel - Jinchuan copper-nickel mine, for example. According to incomplete statistics, by the end of 1991, during the development and utilization of Jinchuan copper-nickel mine, the annual discharge: industrial wastewater more than 20 million tons, of which the standard amount is only about 7 million tons; industrial waste gas is about 13 billion m3, sulfur dioxide emissions from waste gas About 14,000 tons, more than 80,000 tons of soot, and more than 72,000 tons of dust; the tailings slag in the waste residue is 1.519 million tons, and the smelting slag is 590,000 tons. Over the years, the accumulated waste residue has reached more than 60 million tons, and the wastestones emitted from mine exploitation and mining have not been counted.
The “three wastes†have caused serious pollution to factories, mines and urban areas, and have spread to suburban villages and towns, posing a hazard to people, livestock and vegetation. The annual cost of compensation for pollution accidents is as high as 400,000 yuan. The environmental pollution caused by the "three wastes" has caused the attention of the municipal, factory, and environmental protection departments to cause harm to human health and the ecological environment. The radical measures have been taken actively, and the annual pollution control funds amounted to 10 million yuan. The Jinchuan copper-nickel mine example shows that solving the environmental problems of nickel mining enterprises lies in strengthening scientific research, promoting the application of new technologies, making full use of the "three wastes" resources, especially strengthening the comprehensive utilization of tailings and slag, recycling soot, dust, and utilization. Waste heat power generation, heat preservation and heating, full recovery of sulfur, secondary or recycling of wastewater, etc., to prevent the "three wastes" pollution into the use of "three wastes" resources, this is the fundamental way out for environmental protection.
Stop Valves are closed by screwing a rubber gasket down onto a seat in the middle of the valve. Pros only use small versions that act as shutoff valves for fixtures such as sinks and toilets and outdoor sillcocks. Flow is inefficient because of the circuitous route the fluid (water, in most cases) has to follow. It's important to orient the valve in the right direction with the arrow (cast into the side of the valve) aligned with flow direction. That way, water flows against the bottom of the rubber gasket. If the valve is put in backward, the flow will force the gasket away from the top of the valve.
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