A method for producing and purifying sodium bromide using the coke from waste circuit boards pyrolysis residues as reducing agent, belonging to the field of purifying sodium bromide and high-value utilization, and more particularly, relating to a method for reducing and purifying crude bromine salt obtained from waste circuit boards smelting ash by using the coke in waste circuit boards pyrolysis residues. The main steps are as follows: carbonization conversion, water dissolution, filtration, and concentrated crystallization under vacuum heating. The pure sodium bromide was obtained by reducing crude bromine salt enriched from waste circuit board smelting ash by using the coke in waste circuit boards pyrolysis residues, realizing the resource coupling and high-value utilization of the two wastes, avoiding the secondary pollution in the process of recycling the waste circuit boards. It has the characteristics of simple operation, high resource utilization rate and no tail liquid discharge.

A method for producing and purifying sodium bromide using the coke from waste circuit boards pyrolysis residues as reducing agent, belonging to the field of purifying sodium bromide and high-value utilization, and more particularly, relating to a method for reducing and purifying crude bromine salt obtained from waste circuit boards smelting ash by using the coke in waste circuit boards pyrolysis residues. The main steps are as follows: carbonization conversion, water dissolution, filtration, and concentrated crystallization under vacuum heating. The pure sodium bromide was obtained by reducing crude bromine salt enriched from waste circuit board smelting ash by using the coke in waste circuit boards pyrolysis residues, realizing the resource coupling and high-value utilization of the two wastes, avoiding the secondary pollution in the process of recycling the waste circuit boards. It has the characteristics of simple operation, high resource utilization rate and no tail liquid discharge.

The present invention relates to a process for the selective extraction of a salt to be extracted from a brine to be treated containing the said salt to be extracted, characterized in that: the brine to be treated (S1) is sent to an initial extraction stirrer-mixer (1a) into which a liquid hydrophobic organic phase is also introduced, the said brine and the said liquid hydrophobic organic phase are mixed in the said initial extraction stirrer-mixer (1a), and the mixture is sent to an initial decanter-separator (1d, 1dc), in order to obtain: a brine from which salt to be extracted has been removed; and an organic phase loaded with salt to be extracted; the brine from which the salt to be extracted has been removed is recovered; the organic phase loaded with salt to be extracted is sent to an initial washing stirrer-mixer-decanter-centrifugal separator (5a, 5dc or 7a, 7dc), in order to obtain a purified organic phase loaded with salt to be extracted, which is sent to a so-called organic heat exchanger (1e) in which it is heated before being sent to a so-called initial regeneration column (1c; 2c), in which a countercurrent exchange is carried out with hot water at a higher temperature than that of the initial brine, in order to obtain: a water containing the salt to be extracted; and a regenerated organic phase, having lost the salt to be extracted; the regenerated organic phase is recycled to the initial extraction stirrer-mixer (1a).

The present invention relates to a process for treating ash recovered from a recovery boiler. The process is designed to recover valuable pulping chemicals, such as potassium, sodium, carbonate, and sulfate. In the course of treating the ash, a chloride-rich purge stream is produced and includes sulfate, carbonate, potassium, and sodium that can be beneficially used in a wood pulping process. To segregate the chloride from the beneficial chemicals, the chloride-rich purge stream is directed into an anion segregation unit such as a nanofiltration or ion exchange unit. This effectively separates or removes the chloride from the purge stream and enables the beneficial chemicals to be recycled and used in the wood pulping process.

The present invention relates to a process for treating ash recovered from a recovery boiler. The process is designed to recover valuable pulping chemicals, such as potassium, sodium, carbonate, and sulfate. In the course of treating the ash, a chloride-rich purge stream is produced and includes sulfate, carbonate, potassium, and sodium that can be beneficially used in a wood pulping process. To segregate the chloride from the beneficial chemicals, the chloride-rich purge stream is directed into an anion segregation unit such as a nanofiltration or ion exchange unit. This effectively separates or removes the chloride from the purge stream and enables the beneficial chemicals to be recycled and used in the wood pulping process.

The present disclosure relates to the field of non-ferrous metal and chemical industries for the production of metal sodium, and discloses a process for the preparation of high purity metallic sodium and the safe treatment of high calcium content sodium slag, the process comprises the following steps: (1) subjecting a liquid sodium obtained from electrolysis to a supergravity separation to obtain a high purity metallic sodium and a high calcium content sodium slag; (2) subjecting said high calcium content sodium slag to at least one roasting process to obtain a roasting slag; (3) leaching said roasting slag with an alkaline liquor to produce sodium hydroxide solution and calcium hydroxide. The process provided by the present disclosure not only greatly reduces the amount of generated sodium slag, but also implements the safe recovery of calcium and sodium resources from the sodium slag.

The present disclosure relates to the field of non-ferrous metal and chemical industries for the production of metal sodium, and discloses a process for the preparation of high purity metallic sodium and the safe treatment of high calcium content sodium slag, the process comprises the following steps: (1) subjecting a liquid sodium obtained from electrolysis to a supergravity separation to obtain a high purity metallic sodium and a high calcium content sodium slag; (2) subjecting said high calcium content sodium slag to at least one roasting process to obtain a roasting slag; (3) leaching said roasting slag with an alkaline liquor to produce sodium hydroxide solution and calcium hydroxide. The process provided by the present disclosure not only greatly reduces the amount of generated sodium slag, but also implements the safe recovery of calcium and sodium resources from the sodium slag.