4results about How to "Process cleaning" patented technology

This invention provides a method for extracting vanadium from vanadium-containing raw materials. The method includes the following steps: (1) oxidizing the vanadium-containing raw materials to obtain pentavalent vanadium oxide clinker; (2) leaching the pentavalent vanadium oxide clinker with a sodium salt solution to obtain a sodium vanadate solution and leaching residue; (3) adding a reducing agent to the sodium vanadate solution to reduce vanadium, and introducing CO2 to adjust the pH of the solution to obtain vanadium dioxide product and a recovery solution. The recovery solution is returned to step (2) as a leaching solution for recycling. The method for extracting vanadium from vanadium-containing raw materials provided by this invention has a short process, low technical difficulty, low cost, and is environmentally friendly. The comprehensive utilization rate of vanadium is greater than 98%, the purity of the vanadium product is greater than 98%, and the sodium content is less than 0.5%.

The invention discloses a tool and method for controlling the depth of a contaminated layer on the surface of titanium alloy, and the tool comprises a box body which is provided with an opening in the top and is used for accommodating a titanium alloy part to be treated; the top cover assembly is connected with the opening of the box body, the top cover assembly comprises a ceramic matrix composite one-way cover and a one-way exhaust valve, a plurality of vent holes are formed in the ceramic matrix composite one-way cover, and the one-way exhaust valve is installed at the vent holes; the sealing piece is arranged at the joint of the box body and the sealing cover assembly, and the sealing piece is an annular aerogel gasket; the internal bearing mechanism comprises a plurality of internal bearing assemblies, and the plurality of internal bearing assemblies are arranged in the box body; and the pre-vacuumizing valve is arranged on the box body. According to the method, the depth of the surface pollution layer of the titanium alloy subjected to heat treatment can be stably controlled within 0.05 mm and is obviously superior to the upper limit of 0.08 mm required by the existing industrial standard.

This invention belongs to the field of petroleum extraction technology, specifically relating to a desulfurizing agent for oil wells and its preparation method. The preparation method includes: in an alkaline organic solvent, 1,4-bis(3-aminopropyl)piperazine and 1,3-dichloro-2-propanol undergo a first substitution reaction to obtain an intermediate; subsequently, the intermediate undergoes a second substitution reaction with 2-hydroxy-N,N-bis(2-aminoethyl)ethylamine to obtain the oil well desulfurizing agent. Based on 1 mole of 1,4-bis(3-aminopropyl)piperazine, the amounts of 1,3-dichloro-2-propanol and 2-hydroxy-N,N-bis(2-aminoethyl)ethylamine are 1.6-2.4 moles and 1.6-2.4 moles, respectively. The desulfurizing agent of this invention has the advantages of rapid desulfurization and good desulfurization effect, with a sulfur capacity of over 33%.

This invention belongs to the field of industrial waste resource utilization technology, and discloses a zero-discharge resource utilization method for polysilicon waste liquid. The method involves adding sodium hydroxide solution to chlorosilane waste liquid and reacting it, then obtaining sodium silicate solution through stepwise extraction with dilute alkali or one-step extraction with concentrated alkali. Furthermore, calcium carbide slag is calcined and slaked to obtain lime slurry. Then, the sodium silicate solution and lime solution are added to a reaction vessel according to a specific ratio and heated for reaction. The resulting mixture is filtered to obtain microporous calcium silicate material. The filtrate can be recycled as an alkaline solution for chlorosilane waste liquid. This invention effectively solves the problems of scarce resource utilization pathways and low utilization efficiency of chlorosilane waste liquid by synergistically utilizing chlorosilane waste liquid and calcium carbide slag solid waste. The resulting microporous calcium silicate material has excellent physicochemical properties. Simultaneously, the process is simple and the conditions are mild, achieving comprehensive utilization of industrial waste liquid and residue while also contributing to energy conservation, emission reduction, and source environmental protection.