6results about How to "Increase sedimentation rate" patented technology

The invention provides a method for precipitating nickel and cobalt in a solution containing nickel and cobalt and a cobalt nickel hydroxide product. The method comprises the following steps: step S100, carrying out a seed crystal pretreatment reaction on a nickel-cobalt-containing solution by adopting first nickel-cobalt precipitation underflow to form pretreated nickel-cobalt ore pulp; step S200, adding an alkaline precipitation inducer into the second nickel-cobalt precipitation underflow or the first nickel-cobalt precipitation overflow to carry out alkali conversion reaction to form alkali conversion crystal mush; s300, the pretreated nickel-cobalt ore pulp and alkali conversion crystal mush are continuously introduced into a reactor for a nickel-cobalt precipitation reaction, and nickel-cobalt precipitated ore pulp is obtained; step S400, continuously performing dense separation treatment on the ore pulp subjected to nickel-cobalt precipitation; s500, the third nickel-cobalt precipitation underflow is filtered and washed in sequence, a nickel-cobalt hydroxide product is obtained, and the problems that in the prior art, when nickel and cobalt are precipitated through a nickel-cobalt-containing solution, MHP is small in particle size and not prone to sedimentation, the water content of a filter cake is high, or the precipitation rate is poor, and the magnesium content is high before technical improvement are solved.

The invention relates to the field of environmental protection, and particularly discloses a method for rapidly preparing superfine copper powder from a waste lithium ion battery leachate, which comprises the following steps: preparing a battery leachate by using a waste lithium ion battery, adding a reducing agent ascorbic acid and a nucleating agent copper powder into the battery leachate, stirring and reacting, and separating out the superfine copper powder. The copper ions in the battery leachate are recovered in the form of superfine copper powder, and the average particle size D50 of the superfine copper powder is not more than 5 microns. The method provided by the invention is simple and easy to operate, and the prepared superfine copper powder is high in additional value.

The invention discloses a method for efficiently separating and recovering lithium elements from waste lithium iron phosphate, and belongs to the technical field of battery recovery. The invention first obtains waste lithium iron phosphate powder from waste lithium iron phosphate batteries, and then accurately calculates the optimal pH value of the reaction system at the real-time temperature according to the leaching reaction temperature and related thermodynamic data, and introduces a low-concentration phosphate solution into the leaching reaction and adjusts the pH value of the system to the optimum, thereby ensuring that most of the iron ions can be effectively precipitated in the form of iron phosphate during the reaction process, thereby achieving efficient separation of lithium and iron elements, and finally adjusting the pH value of the filtrate and adding a saturated phosphate solution to recover high-purity lithium phosphate. The invention can accurately calculate the optimal pH value corresponding to different reaction temperatures according to the reaction temperature and related thermodynamic data, thereby saving a large amount of early exploration experimental cost and time, improving the overall production efficiency, and enhancing the universality of the process.

The utility model discloses an electroplating cyanide-containing wastewater treatment system, and relates to the technical field of wastewater treatment. Comprising a cyanide precipitation system, an acidification system, a crystallization aging system, a primary flocculating settling system, a solid-liquid separation system, a primary cyanide breaking oxidation system, a secondary cyanide breaking oxidation system and a secondary flocculating settling system which are sequentially communicated according to the treatment direction of the cyanide-containing wastewater. The waste water treatment device can reduce consumption of chemical oxidizing agents in the waste water treatment process, is beneficial to recovery of valuable metals, and is simple in process and easy to operate.

The invention relates to a method for enhancing the replacement activity of zinc powder in the zinc powder purification and copper and cadmium removal process through ultrasonic waves, and belongs to the technical field of zinc calcine neutral leachate impurity removal. Industrial hydraulic atomized zinc powder is used as a raw material for replacing copper and cadmium, and copper and cadmium are removed through replacement with the zinc powder under the ultrasonic condition; according to the present invention, the copper and the cadmium are removed under the conditions of the pH value of 5.0-5.4 and the room temperature, the amount of the zinc powder is reduced by 26-35%, the standard cadmium and copper removal rate can still be obtained, the replacement reaction time is shortened by 50%, the high precipitation rate of the copper and the cadmium is achieved with the low amount of the zinc powder and the low reaction temperature, and the method is suitable for industrial production. And the purified zinc calcine neutral lixivium is directly sent to an electrodeposition process without adjusting the pH value, so that the production cost is greatly reduced. In addition, the whole process is clean and efficient, and meets the requirements of clean production and environmental protection.

This invention discloses a process for preparing modified silica from vanadium ore leaching tailings, belonging to the field of industrial waste treatment and utilization technology. The steps include: (1) non-grinding alkaline leaching of silica: vanadium ore leaching tailings are leached without grinding with sodium hydroxide and water in a certain ratio and then heated for leaching; after cooling, the residue and filtrate are obtained by solid-liquid separation, and the filtrate is water glass; (2) preparation and modification: self-composite electrolyte is added to water glass, and a new combination modifier is added, followed by acid neutralization to produce silica gel precipitate, which is dried and ground to obtain modified silica product; the electrolyte includes 60% to 80% sodium sulfate and 20% to 40% sodium carbonate by mass percentage; the modifier includes 40% to 80% hexadecyltrimethylammonium bromide and 20% to 60% sodium dodecyl sulfate by mass ratio. The process of this invention can turn the vanadium acid leaching tailings from clay vanadium ore into a valuable resource, achieving reduced treatment and resource utilization, while also producing high-quality silica products.