3results about How to "High main content" patented technology

The invention relates to the technical field of nickel-containing dangerous and solid waste recycling, and discloses a complex nickel-containing waste smelting flue gas cleaning and comprehensive utilization method which comprises the steps that smelting flue gas is fed into a dry-method deacidification tower after being subjected to waste heat recovery and shock cooling, coarse-particle calcium hydroxide is sprayed into the dry-method deacidification tower, defluorination is preferentially carried out in a first temperature interval of the dry-method deacidification tower, and defluorination is carried out in a second temperature interval of the dry-method deacidification tower; a defluorination product is collected, and fluorine-containing dust is separated and collected through electrostatic dust collection; the dedusted flue gas enters a semi-dry deacidification tower, and fine-particle calcium hydroxide is sprayed into the semi-dry deacidification tower for deep dechlorination in a lower second temperature interval of the semi-dry deacidification tower; and discharging the purified gas after denitration, washing and ionic liquid desulfurization. The defluorination product is washed and purified to prepare hydrofluoric acid, and the dechlorination slag is dissolved and subjected to a double decomposition reaction to prepare hydrochloric acid. According to the method, a temperature gradient and absorbent particle size gradient coupling process is utilized, so that directional separation and enrichment of gas-phase fluorine and chlorine pollutants are effectively realized, the problem that carnallite is difficult to utilize is solved, and full-process recycling and ultralow emission are realized.

This invention provides a production apparatus for coarse-crystalline sodium metabisulfite, comprising a primary reactor, a secondary reactor, a tertiary reactor, and a sodium carbonate liquid tank connected in series. The primary reactor has a sulfur dioxide inlet on its side wall. A flow pump is installed on the connecting pipe between the secondary reactor and the primary reactor. A gas flow meter is installed at the sulfur dioxide inlet. A pH probe is installed inside the primary reactor. A crystallizer is connected to the bottom of the primary reactor via a conveying pipe equipped with a conveying pump. The crystallizer is installed higher than the primary reactor. An overflow pipe connected to the primary reactor is located at the top of the crystallizer, and a discharge pipe with a discharge valve is connected to the bottom of the crystallizer. The coarse-crystalline sodium metabisulfite production apparatus provided by this invention can increase the particle size of sodium metabisulfite, improve the main content of the product, enhance product quality, and extend the product's agglomeration cycle.

From the lithium sulfate purification completed liquid-liquid and sodium (potassium) carbonate purification completed liquid heat precipitation process output crude lithium carbonate, to output fine lithium carbonate wet product, there are already removed silicon, aluminum, iron, magnesium, calcium, heavy metal method mostly unchanged, but can be used in the present application 2 "pre-deposition supplementary impurity removal" auxiliary, detection method is not changed; using the present application 1 "reverse feeding, no circulating mother liquor" and 3 "high efficiency desorption", can make industrial grade lithium sulfate to 0.03%, the main content increases to 2.5N, battery grade sulfate decreases to 0.010%-0.008%, the main content is stable to 3N or even touch 3.5N-4N limit position. "High efficiency desorption" by'micro-temperature heat precipitation and hot washing' (105-115 degrees Celsius) and 'high temperature strong desorption' (140-160-170 degrees Celsius) release the deeply wrapped impurities such as sulfate in the core position of peritectic, then by "hydrocyclone separation" liquid phase effectively taken away. Heat precipitation changes to small crystal and moves the heat aging time to 'high temperature strong desorption'.