2 results about "Thallium compounds" patented technology

The invention discloses a technological method and system for extracting lithium from lepidolite through fluidized roasting and water leaching, and belongs to the technical field of treatment methods of lithium-containing minerals. The method comprises the following steps: S1, mixing lepidolite mineral powder with a sulfate auxiliary agent to prepare a roasted raw material, adding a fluorine fixing auxiliary agent, and mixing to prepare a mixture; s2, the mixture and fluidizing gas are subjected to preheating treatment; s3, the preheated mixture and fluidizing gas are fed into a fluidized bed roasting furnace to be subjected to a fluidized roasting reaction, and roasting clinker, a fluorine fixing auxiliary and thallium-containing tail gas are obtained through separation; s4, the thallium-containing tail gas is subjected to cyclone preheating and wet defluorination and reacts with metal sulfide, a gaseous thallium compound is removed, and solid thallium sulfide is prepared; and S5, cooling the roasted clinker, performing water leaching, filtering, neutralizing and precipitating lithium, so as to obtain lithium carbonate and leaching residues. The method is more environmentally friendly and efficient, the lithium smelting slag amount can be remarkably reduced, and fluorine recycling is achieved.

A glass powder for N-type silver-aluminum paste comprises a lead-containing compound, a silicon-containing compound, a thallium-containing compound and a zinc-containing compound, wherein the compounding of the thallium-containing compound and the lead-containing compound confers good silver melting capability on the glass powder, and the prepared silver-aluminum paste has good wettability to the surface of a solar cell silicon wafer; the silicon-containing compound provides a more complete network structure for the glass powder; and the zinc-containing compound reduces the softening temperature of the glass powder and further reduces the sintering temperature of the prepared N-type silver-aluminum paste; further comprises a compound containing a first main group metal element, and the compound can react with a zinc-containing compound to further reduce the softening temperature of the glass powder, further reduce the sintering temperature of the prepared N-type silver-aluminum paste and improve the preparation yield of the N-type solar cell.