32results about How to "Easy to achieve continuous production" patented technology

The invention discloses a method for preparing silicon-calcium alloy. The method comprises the following steps of: mixing 30 to 100 weight percent of silica powder or / and CaSiO3 powder and 0 to 70 weight percent of limestone powder or / and quicklime to prepare a porous raw blank; sintering and molding the porous raw blank at the high temperature of between 700 and 1,200 DEG C, and placing the product in a metal basket as a cathode; putting in calcium chloride fused salt at the temperature of between 800 and 950 DEG C and performing electrolysis by taking graphite or inert material as an anode; and performing vacuum melting on the electrolysis product to separate the electrolysis product from the fused salt so as to obtain the silicon-calcium alloy. In the method, the silicon-calcium alloy is prepared by combining solid reduction and electro-deposition; and the method has the characteristics of low operation temperature, cheap and readily available raw materials, high product purity and adjustable calcium content and product composition. Moreover, electrolysis can be performed by constant current or voltage, continuous production is easy to realize, high current efficiency can be achieved and the energy consumption and cost of silicon production can be obviously reduced.

The invention discloses a method for preparing a calcium sulfate whisker through recrystallization. The method is characterized in that the method comprises the steps of (1), conducting program control on heating and dissolution courses: putting a raw material with a main ingredient of calcium sulfate into a sulphuric acid solution for stirring, heating simultaneously, heating a mixture to 60-95 DEG C at a certain rate with the adoption of the program control, dissolving for 20min-1h, (2), conducting the program control on cooling and recrystallization courses: using the program control to cool a suspension obtained by dissolution to 10-30 DEG C, ageing for 20min-2h, (3), conducting separating and washing courses: conducting solid-liquid separation on the suspension, washing a separated solid-phase product, and (4), conducting a drying course: drying the washed solid-phase product at a certain temperature, and obtaining the calcium sulphate dihydrate whisker. The calcium sulfate whisker is prepared by utilizing a recrystallization principle under an ordinary-pressure mild condition, and a relatively economical technological approach can be provided for the resource utilization of industrial by-products such as desulfurization gypsum and phosphogypsum.

The invention discloses a preparation method of a double-net hydrogel fiber and a product thereof. The preparation method mainly includes following steps: (1) preparation of a spinning raw solution: dissolving one or more water-soluble natural polysaccharides and a water-soluble acrylamide polymer in water with stirring uniformly, and performing filtration and defoaming to obtain a mixed spinning raw solution containing the natural polysaccharides and the acrylamide polymer; (2) preparation of a water-containing primary gel fiber: performing wet spinning, or dry-wet spinning or gel spinning to the mixed spinning raw solution prepared in the step (1), performing a spinning process at a preset speed, mixing the mixed spinning raw solution with a coagulating bath, to obtain the water-containing primary gel fiber; and (3) radiation crosslinking: drafting the primary gel fiber into an ionizing radiation apparatus and performing the radiation crosslinking to the primary gel fiber prepared in the step (2), and performing a subsequent drafting operation, a thermal-moulding operation, a winding-up operation and a fiber-cutting operation to obtain the double-net hydrogel fiber.

The invention discloses a gas-solid phase combined production method of styrene and benzaldehyde, which uses ethylbenzene and oxygen as raw materials to carry out catalytic oxidation reaction to obtain reaction feed liquid and CO x , the reaction feed liquid is separated to obtain styrene and benzaldehyde; the catalyst includes a carrier and an active component, the carrier is boron nitride, the active component is a transition metal oxide, and the synergistic effect of boron nitride and transition metal oxide promotes The generation of high value-added products is achieved, and the present invention obtains two kinds of high value-added products simultaneously, and the selectivity of styrene reaches 72%, and the selectivity of benzaldehyde reaches 22%, and CO x The selectivity is only 2%. The gas-solid phase selective oxidation reaction route reduces the energy consumption of styrene production, and the produced benzaldehyde does not contain halogen, which greatly improves the added value of the product and makes it easier to realize continuous production. In addition, ethylbenzene, styrene, and benzaldehyde are easily separated by rectification, and the operation cost is low. The reaction path and catalyst provided by the invention have industrial application prospects.

The invention provides an open carbonization method for strengthening recycled aggregates of waste concrete. The waste concrete is crushed to obtain granular recycled aggregates. The granular recycled aggregates are soaked in water, and industrial waste gas containing carbon dioxide is continuously introduced. During the soaking process, the carbon dioxide contained in the industrial waste gas undergoes a carbonization reaction with the attached mortar on the surface of the granular recycled aggregate. The invention does not need a carbon dioxide sealed carbonization device, is easy to produce continuously, and can utilize industrial waste gas of carbon dioxide with different concentrations.