5results about How to "Process parameters are easy to adjust" patented technology

This invention discloses a method for the comprehensive utilization of sulfide tailings, relating to the field of sulfide tailings treatment technology. This method uses lead-zinc tailings as raw material and innovatively employs a combined "two-stage acid leaching-gravity separation-flotation" process. First, two stages of acid leaching selectively leach calcite associated with barite in the tailings, reducing the influence of muddy calcite while activating pyrite. Subsequently, the acid leaching residue undergoes gravity separation to further separate undissolved calcite, quartz, and other silica-containing gangue minerals. The gravity concentrate is then subjected to flotation to achieve the separation of barite and pyrite, ultimately obtaining high-purity barite and pyrite products respectively. This invention features a reasonable process route and simple operation, effectively solving the separation problem of fine-grained, high-viscosity lead-zinc tailings, achieving full-component purification and utilization of lead-zinc tailings, significantly enhancing the economic value of tailings resources, and reducing the environmental pressure caused by tailings stockpiling, thus demonstrating good economic, environmental, and social benefits.

This invention discloses a high-rate carbon-coated lithium iron phosphate cathode material and its preparation method, relating to the field of lithium-ion battery cathode material technology. The material constructs a unique bilayer composite carbon-coated structure on the surface of lithium iron phosphate particles, including an inner continuous dense conductive carbon layer and an outer three-dimensional porous carbon network layer. The inner carbon layer ensures rapid electron conduction, while the outer porous carbon layer maintains electron pathways, provides abundant ion diffusion channels, and buffers volume changes. The preparation method utilizes a stepwise liquid-phase coating and segmented heat treatment process. This invention effectively solves the problems of poor electronic conductivity and slow ion diffusion in lithium iron phosphate materials, significantly improving its high-rate charge-discharge performance and cycle stability. Furthermore, the process is controllable and suitable for large-scale production, showing broad application prospects in power batteries and high-power energy storage.

This invention, entitled "A Low-Loss β-Carotene Microcapsule and Its Preparation Method," belongs to the field of microcapsule preparation technology. The technical problem to be solved is that during high-temperature melting, particulate all-trans β-carotene transforms into a molecular state, but this process generates a large number of cis isomers and results in significant content loss. Furthermore, the particle size and dispersibility of the particulate β-carotene prepared by grinding are still unsatisfactory, leading to low bioavailability and poor application effects. The key point of this technical solution is to prepare high all-trans molecular β-carotene microcapsules through a specific combination of treatments. This reduces content loss and cis-trans isomerization during the transformation of β-carotene from particulate to molecular state, thereby significantly improving the bioavailability of β-carotene microcapsules. Moreover, the preparation process is simple, cost-controllable, and suitable for large-scale industrial production.

This invention relates to the field of ammonium dihydrogen phosphate (MDP) production technology. It discloses an apparatus and method for producing low-impurity, fully water-soluble MDP using a concentrated acid process. The apparatus comprises sequentially connected systems for acid adjustment, neutralization reaction, impurity removal and aging, filtration and separation, triple-effect concentration, continuous steady-state crystallization, and drying. The core of the method lies in the neutralization system, which employs a three-stage series connection of a rapid ammoniation reactor, a tubular reactor, and a slurry tank to achieve segmented pH control for neutralization. Furthermore, it innovatively uses self-produced ammonium fluoride as a purification agent, combined with pH reversal technology, to deeply remove metallic impurities such as Fe, Al, and Mg from wet-process phosphoric acid. After concentration, the slurry undergoes a unique de-crystallization-steady-state crystallization system to obtain large-size, high-purity crystals. This method enables the stable production of high-end MDP with a main content ≥99% and water-insoluble matter ≤0.01% using low-cost wet-process phosphoric acid as raw material, achieving a phosphorus yield of over 71%, and can replace thermal process products.

The invention relates to the technical field of biological medicine manufacturing, and provides a water-soluble microcapsule and a preparation method thereof.The preparation method comprises the following steps that an emulsifying agent, a thickening agent and a water-soluble monomer are dissolved in water, and an emulsion continuous phase is obtained; the content of the emulsifier in the water is 0.5%-5%; the content of the thickening agent in the water is 0.5%-5%; the ratio of the water-soluble monomer to the water is (1: 100)-(20: 100); the water-soluble monomer is introduced to increase the viscosity of a water phase and participate in construction of a shell layer, so that diffusion of a core material to the water phase is effectively inhibited, and high encapsulation efficiency and high drug loading capacity are realized; the process parameters such as the emulsifying rotating speed and the monomer proportion are easy to adjust, microcapsules with the particle size ranging from 1 micrometer to 800 micrometers can be prepared in a controlled mode, the packaging requirements of different water-soluble active substances such as vitamins and enzyme preparations are met, and the product adaptability is good.