38results about How to "Avoid dissolution loss" patented technology

The invention belongs to the technical field of environmental monitoring, in particular to a pretreatment method for dehydrating, dedusting and retaining components to be detected in boiler smoke detection. The method includes that smoke is fed into corresponding buffer solution according to the properties of the smoke to be detected, components with properties opposite to the component to be detected are removed, and meanwhile water vapour and dust in the smoke are absorbed; the buffer solution is divided into sulphur retaining buffer solution and ammonia retaining buffer solution; and sulphur retaining drying agent or ammonia drying agent mixed by analytical reagent is fed in when the humidity of the smoke after being treated is more than or equal to 50%, so as to realize further dehydration. By adopting the method of the invention, dissolution loss of sulphur dioxide or ammonia can be avoided even if cooling dehydration is carried out on high humidity low concentration smoke, and meanwhile the technical problem that dedusting instrument pipeline is easy to be blocked can be efficiently solved, so that a measuring instrument can continuously operate for a long time in an almost dry and dustless environment and is difficult to damage and service life is prolonged.

The invention relates to the field of chemical industry, in particular to a method for recovering magnesium from ferronickel slag, which comprises the steps of immersing the ferronickel slag in concentrated sulfuric acid at atmospheric pressure, adding crystal seeds, and crystallizing out magnesium sulfate. The magnesium in the ferronickel slag is converted into magnesium sulfate for recovery of magnesium by adopting the all-wet process. The process is simple, easy to operate, requires low equipment, and has a high recovery rate of magnesium. Magnesium sulfate has a wide range of applications and high added value. It can improve the comprehensive utilization rate of nickel-iron slag.

The invention discloses a method for producing hydrogen chloride and sodium hydrogen sulfate crystals by taking rock salt as the raw material, which comprises the following steps that: the mixture of sodium sulfate and sodium chloride, i.e. rock salt and sulfuric acid react to produce the hydrogen chloride and sodium hydrogen sulfate crystals; first, under a stirring condition, according to a certain stoichiometric ratio, sulfuric acid and rock salt are intermittently added into a glass lining reaction vessel to react while the temperature is insulated; and then sodium bisulfate solution which contains sulfuric acid is introduced to a crystal tower which contains an appropriate amount of water from the bottom of the reaction vessel to be cooled, crystallized and vacuum filter step by step, and then is washed by saturated sodium bisulfate solution to prepare sodium bisulfate crystals; and finally, the high-concentration sulfuric acid is added into the filtrate to be mixed to be sulfuric acid with the initial reaction concentration, and recycled. The method of the invention not only makes full use of natural resources, but also improves the added value of the rock salt, does not discharge any waste liquid, and meets the requirements of sustainable development.

The invention discloses a preparation method and application of a fast ion conductor-coated lithium-ion battery positive electrode material; the method is to mix nano-scale aluminum powder and positive electrode material by ball milling, and then stir and react with a lithium-containing solution to obtain aluminum hydroxide colloidal coating Coated positive electrode material precursor; the aluminum hydroxide colloid coated positive electrode material precursor is calcined at a high temperature to obtain a lithium ion battery positive electrode material coated with a dense, uniform and stable fast ion conductor, which can be used for A lithium-ion battery positive electrode with high rate performance and high cycle performance is prepared, and the preparation method has the characteristics of low cost, simple operation, and environmental friendliness, and can be applied to industrial production on a large scale.