4results about How to "Increase resource value" patented technology

The invention discloses a heavy metal emission reduction and sludge reduction treatment process method for circuit board wastewater. The invention provides a layered precipitation strategy of'first acid, second alkali and second sulfur '. The method comprises the following steps: performing acid precipitation on alkaline organic wastewater by using acidic wastewater, and recovering printing ink residues; carrying out air stripping treatment on the copper ammonia wastewater by utilizing an alkaline condition, and precipitating high-purity copper hydroxide; and finally, carrying out deep precipitation on residual complexing heavy metals by utilizing excessive sulfides in the pretreatment stage, and further recovering copper resources in the comprehensive water tank through coprecipitation of copper hydroxide and copper sulfide. Sludge generated in each process is classified and treated; printing ink slag, biochemical residual sludge and copper / nickel sulfide sludge are subjected to synergistic pyrogenic process treatment; copper hydroxide sludge is selectively subjected to acid dissolution to prepare copper sulfate. Lime, ferrous sulfate and polyaluminum are not used in the whole process. According to the method, the medicament is utilized to the maximum extent, the sludge is reduced by 50% or above, and the resource value of valuable metal is increased by 3-5 times.

The application relates to the technical field of battery electrolyte recovery, and discloses a scrapped battery electrolyte recovery equipment, which comprises a processing unit used for containing scrapped batteries to be processed, a piercing mechanism arranged in the processing unit and used for piercing the explosion-proof valves of the scrapped batteries, a vacuum pump one connected with an air outlet of the processing unit and used for vacuumizing the processing unit and discharging gaseous electrolyte, a negative pressure gas-liquid separator arranged on a pipeline between the processing unit and the vacuum pump one and used for preliminarily separating the discharged gaseous electrolyte, and a gas storage tank with an air inlet connected with an air outlet of the vacuum pump one and used for temporarily storing the gas discharged by the vacuum pump one. In the fine recovery scheme, three-stage pressurization and two-stage heat exchange and liquefaction in each stage of the gradient pressurization section are adopted, so that the overall recovery rate of the electrolyte is remarkably improved, fine separation of various components is realized, the subsequent separate recycling is facilitated, and the resource value is improved.

The invention discloses a process for high-temperature harmless treatment of overhaul slag. The aluminum electrolysis overhaul slag is crushed and mixed with sodium carbonate and calcium carbonate, the sodium carbonate reacts with the overhaul slag at the high temperature to convert a fluorine-containing compound into soluble fluoride, meanwhile, the calcium carbonate is mixed at the high temperature, the soluble fluoride is converted into CaF2, and the fluorine curing effect is achieved. The method can effectively solve the problem of safe disposal of dangerous waste residues generated by electrolytic aluminum, so that the dangerous waste residues meet the environmental protection requirement, and the purpose of comprehensive and harmless treatment of the electrolytic aluminum overhaul waste residues is achieved.