Abstract: Provided is a high permeance nanofiltration membrane with nanoring-like structure and preparation method thereof. The membrane includes a base film and a polyamide layer having nanoring-like structure morphology on its surface. The method includes: (1) formulating a piperazine nanoemulsion containing a surfactant, vegetable oil, piperazine and water; and (2) infiltrating a base film with the piperazine nanoemulsion, and removing excess droplets from the surface of the base film to obtain a treated base film; covering the surface of the treated base film with a solution of trimesoyl chloride in n-hexane to perform interfacial polymerization; and drying the resulting membrane.

Abstract: A zeolite membrane and a preparation method thereof are provided. The method includes: adding an organic binder solution dropwise to zeolite, and thoroughly grinding and stirring; blade-coating a resulting mixture on a substrate at a given thickness; and drying to obtain the zeolite membrane. The preparation of a zeolite membrane does not require a complicated hydrothermal crystal growth process, and the membrane can be prepared directly from natural zeolite or artificial zeolite. A prepared zeolite membrane has the characteristics of simple preparation process, low cost, prominent water permeability, high contaminant rejection rate and high zeolite load. The zeolite membrane, when used for the rejection of contaminants in water, can not only remove macromolecular contaminants in water, but also efficiently remove ammonia nitrogen by way of ion exchange, which is suitable for advanced treatment of wastewater.

Abstract: A heat retainer for a hot blast stove of a blast furnace, the heat retainer adapted to function without decomposition at temperatures of about 1200° C., wherein: at least one surface of said heat retainer is coated with a high radiative and highly-emissive material forming said coating layer; the thickness of said coating layer is critically between 0.02 mm and 3 mm; the heat retainer absorbs energy or emits energy mainly by radiation; and energy of radiation is mainly at a wavelength of 1-5 ?m.

Abstract: Taught herein is a heat retainer for a heat exchanger the retainer having a coating layer. At least one surface of the heat retainer is coated with a highly-radiative material forming a coating layer whose emissivity is greater than that of a substrate material of which the core of the heat retainer is made. The heat retainer is in the shape of a honeycomb, a fin, a ball, an ellipse or a plate, and one or a plurality of inner holes are disposed therein. The substrate of which the heat retainer is made is a refractory material, a ceramic material or a steel material. The heat retainer has comparatively good heat absorption and emission performance; heat storage capacity is increased, diathermancy is improved, and energy is saved.