3results about How to "Difficult to handle" patented technology

A composite double well fire flooding method for low permeability difference oil layer belongs to the technical field of artificial auxiliary viscosity reduction technology in tertiary oil recovery process. The composite double well low permeability reservoir development process is as follows: two wells are drilled at all well sites in the oil production core area, one is a composite oil production well, and the other is a fire flooding air injection well. All the drilled wells at the outer edge of the reservoir are single oil production wells. The fire flooding air injection well in the well pattern supplements the high production layer and is ignited by physical and chemical methods. Any oil production well in the well pattern cannot supplement the fire flooding layer. The present application has the following characteristics: the composite double well fire flooding technology absorbs the advantages of steam huff and puff development, steam flooding, fire flooding and other development methods, has low cost, good effect, reduces labor intensity and saves human resources.

The invention discloses a preparation method and application of magnolol derivatives, and belongs to the technical field of organic synthesis. The invention relates to an application of lignite residues as a catalyst to generate magnolol derivatives, which comprises the following steps: S1, mixing magnolol with a diazo ester compound, adding acetonitrile, and continuously stirring; s2, adding lignite residues as a catalyst, reacting at room temperature for 1 hour, heating to 70 DEG C, and continuously reacting for 10-12 hours; s3, stopping the reaction when the reaction of the raw materials is detected to be complete by TLC; and S4, filtering the reaction material, washing the filter cake with dichloromethane until the filter cake is colorless, carrying out reduced pressure concentration on the filtrate to remove volatile components, and carrying out silica gel column chromatography separation to obtain the magnolol derivative. According to the method, the lignite residues are adopted as the catalyst, the problem that the lignite residues are difficult to treat can be solved, a new thought can be provided for selection of the catalyst in the organic synthesis reaction, recycling of waste resources is achieved, and the method is suitable for the purposes of green chemistry and environmental protection.

The application discloses a kind of lead-zinc ore beneficiation method and system in polymetallic ore, it is related to the technical field of beneficiation, including the following steps: S1, crushing;S2, grinding;S3, lead flotation: the ore pulp after grinding is sent to lead flotation tank, flotation reagent includes 25# black medicine, butyl xanthate, foaming agent and zinc inhibitor, using 1 rough 2 sweep 3 precise flotation, and output lead concentrate and lead tailings;S4, zinc flotation: lead tailings are sent to zinc flotation tank, and flotation reagent includes copper sulfate, butyl xanthate and foaming agent, using 1 rough 2 sweep 3 precise flotation, and output zinc concentrate and zinc tailings;S5, tailings, wastewater treatment: the fluorite tailings produced by flotation are subjected to solid-liquid separation, and the liquid phase is sent to a sewage treatment station for treatment, and the treated water is recycled to the beneficiation section;Solid phase is sent to mine for filling treatment or used as building material, solve the problem that there is no efficient, environmentally friendly, economic lead-zinc ore comprehensive recovery beneficiation process suitable for the ore properties in Sichuan Mabian area in the prior art.