2results about How to "Realize resource processing" patented technology

This invention belongs to the field of comprehensive lithium slag recycling technology, and provides a method for the comprehensive recovery of lithium, rubidium, cesium, niobium, and tantalum from lithium slag. The method includes: magnetically separating lithium slag to obtain niobium-tantalum concentrate and tailings; sequentially roasting and alkali leaching the tailings to obtain leaching residue and leachate; adding a lithium adsorbent to the leachate for lithium adsorption to obtain a lithium-rich adsorbent and a lithium-removed liquid; desorbing the lithium-rich adsorbent to obtain a lithium-containing solution; then adding sodium carbonate to the lithium-containing solution to obtain lithium carbonate; and extracting and back-extracting the lithium-removed liquid to obtain rubidium chloride and cesium chloride. This invention enables the full recycling and utilization of lithium slag, recovering rubidium, cesium, niobium, and tantalum rare metals simultaneously with lithium, achieving resource-based treatment of solid waste. The lithium recovery rate reaches over 90%, and the rubidium and cesium recovery rates reach over 70%. The obtained lithium carbonate can be directly used, and the leaching residue can be directly used as cement raw material, thus improving the comprehensive utilization value of lithium slag.

The invention discloses an oil sludge pyrolysis catalyst and a preparation method thereof, and belongs to the technical field of oily sludge treatment. The preparation method comprises the following steps: (1) pretreating coal coke to obtain modified coal coke; the pretreatment comprises the following steps: firstly, treating the coal coke by using organic acid, and then treating the coal coke treated by the organic acid by using alkali liquor; and (2) mixing the modified coal coke with ferric salt, and then sequentially carrying out solid-liquid separation, drying, calcining and reduction treatment to obtain the oil sludge pyrolysis catalyst. The coal coke is modified in an acid-base sequence, pore channels are opened and functional groups are increased through organic acid treatment, the pore channels are widened and heavy metal impurities are removed through alkali treatment, and the pore structure of the carrier is synergistically improved; then an iron active component is loaded, and the catalytic activity is improved through calcination and hydrogen reduction activation. When the prepared catalyst is used for oil sludge pyrolysis, the oil recovery rate can reach 94% or above, the preparation process is environmentally friendly, and resource utilization of oil sludge is achieved.