81results about How to "Reduce the difficulty of separation and purification" patented technology

The invention discloses a separation and purification method for garnets of iron ore tailings. The method includes the following steps that firstly, the iron ore tailings are led into a flat plate strong magnetic separator to be subjected to tailings discharging separation under the magnetic field strength being 1300 mt-1500 mt, and magnetic minerals and non-magnetic minerals are obtained; secondly, the magnetic minerals are led into a cylindrical strong magnetic separator, and the strong magnetic minerals and the weak magnetic minerals are separated under the magnetic field strength being 350 mt-400 mt; thirdly, the weak magnetic minerals are subjected to screening and classifying operation, the classified weak magnetic minerals are sorted through jigging and a shaking table according to the particle granularity, and garnet particles and silicate minerals which are large in density difference are separated out; and fourthly, the garnet particles are subjected to dry type strong magnetic separation, garnet concentrates and weak magnetic minerals with the magnetization coefficient smaller than that of the garnet concentrates are separated out, and the garnet concentrates are obtained. The invention further discloses the garnet concentrates. By means of the separation and purification method for the garnets of the iron ore tailings, no auxiliary needs to be added, the separation and purification difficulty is lowered, and the purity of the prepared garnets is improved.

The invention discloses a phosgenation reactor and a method for preparing isocyanate monomer by using the reactor. The reactor comprises an inner feeding pipe, an outer feeding pipe, a mechanical stirring shaft, a rotating area and a kettle body, and the rotating area Including the support structure, the packing block in the rotating area, the upper discharge device, and the lower discharge device; among them, the inner feed pipe and the outer feed pipe are arranged coaxially from the inside to the outside, and the upper and lower discharge devices are arranged in parallel and pass through the support structure connected with each other, and communicated with the outer and inner feed pipes respectively, the filling block in the rotating area is filled between the upper and lower dischargers, the upper discharger is connected with the mechanical stirring shaft, and the kettle body is provided with a gas phase outlet, a liquid Phase outlet, gas phase inlet, liquid phase inlet. Through the pretreatment of the hydrochloride solution in the reactor, the salt concentration and the quality of the hydrochloride solution are improved, and at the same time, the rapid removal of hydrogen chloride gas during the phosgenation process is achieved, effectively reducing the generation of chlorinated by-products , to reduce the difficulty of product separation.

The invention discloses a method for extracting taxane type active ingredients from Chinese yew efficiently. The method comprises the following steps of: firstly extracting with water, further extracting with alcohol, and further purifying by a traditional purification method to get paclitaxel, 10-deacetyl baccatin III, taxol-7-xyloside, cephalomanine and other non-water-soluble taxane type substance monomers. According to the method disclosed by the invention, macroporous resin is applied to the extraction process, the extraction yield of the active ingredients is far higher than that of a traditional extraction method, the using quantity of an organic solvent is further significantly reduced, and the method is suitable for large-scale production of the paclitaxel and comprehensive extraction of other taxane active ingredient substances.