42results about How to "Improve economic and technical indicators" patented technology

The invention relates to a method for improving filtration performance of zinc oxide leaching liquid, and belongs to the technical field of nonferrous metallurgy. According to the invention, zinc oxide smoke and a calcium aluminum composite desiliconization agent are mixed and added to a sulfuric acid dilute solution to conduct leaching for a period, and the leaching finish point acidity is kept to range from 0.8g / L to 2.5g / L. In the process of leaching of the zinc oxide smoke, an insoluble compound is generated by Ca2+ and Al3+ in a reaction between silicic acid and the calcium aluminum composite desiliconization agent in the leaching liquid, the content of the silicic acid, affecting filtration, in the solution is reduced, and therefore the filtration performance of the solution is improved. Compared with the prior art, the method has the advantages that an existing zinc oxide smoke leaching technology does not need to be changed, the operation that oxhide gelatin is added to improve the filtration performance of the solution is not required, and therefore the content of organic matter, generated after recycling of tannic acid, in the zinc electrowinning process of the sulfuric acid solution can be obviously reduced, the hazard caused by the organic matter to zinc electrowinning is reduced, the economic and technical indexes of zinc electrowinning are improved, the overall cost of production run is reduced, and the operation is easy and convenient.

The invention provides a mobile wind turbine generator system high-low voltage ride through test device, which is applicable to high-voltage system tests and low-voltage system tests simultaneously, the test device is connected in series between a wind turbine generator system and a power network, and mainly comprises an input breaker, a voltage regulation unit, a bypass breaker and an output breaker. By adopting a transformer secondary side multi-tap voltage regulation mode, for thyristor high-speed switching control as well as a vehicle-mounted container structure, transformer output voltage is changed through controlling the on-ff of a thyristor, and thus a simulation test of different voltage class failures of a wind turbine generator system to be tested is achieved. By using the mobile wind turbine generator system high-low voltage ride through test device provided by the invention, high-low voltage ride through tests can be accomplished simultaneously, and the device has high integration, high reliability and highest economic and technical norms; the device can be applied to testing various types of wind generators, meet high-low voltage ride through test criteria in China as well as countries in Europe and America, and has a wide application range; and the device adopts a vehicle-mounted container structure, adopts a modular design, is convenient to transport and is flexible in testing.

The invention relates to a method for improving the content of ferrous iron in leaching liquid during the zinc oxide smoke and dust leaching process, and belongs to the field of zinc hydrometallurgy.The method comprises the steps that in the second-stage acid leaching process of zinc oxide, first-stage acid leaching bottom flow is guided into a second-stage acid leaching 1# reaction tank and a second-stage acid leaching 2# reaction tank, roasted dust and waste electrolyte are added into the second-stage acid leaching 1# reaction tank, roasted sand leaching acid bottom flow, sulfur concentrateand concentrated sulfuric acid are added into the second-stage acid leaching 2# reaction tank, full reaction is conducted, then mixing is conducted, and a mixture is guided into a second-stage acid leaching 3# reaction tank for further reaction, obtained high-iron second-stage acid leaching ore pulp is filtered, so that lead slag and high iron liquid are obtained; and the high iron liquid returnsto a first-stage acid leaching process for first-stage acid leaching iron supplement. Through the method for improving the content of the ferrous iron in the leaching liquid during the zinc oxide smoke and dust leaching process, the content of Fe2+ in the high iron liquid is improved to 16000-22000 mg / L, so that it is ensured that the content of first-stage acid leaching Fe2+ is stably controlledto be 5000-6000 mg / L, and smoothing carrying out of the neutralizing and impurity removing process of subsequent stages is ensured.