Abstract: A full slag covering, spatter-free flux-cored welding wire, relating to the technical field of welding material formulations, which includes a flux core and a metal sheath, wherein the flux core is a slag system based on a neutral slag of calcium oxide-titanium dioxide-aluminum oxide; and molten drops are prevented from flying out to form spatters under the action of liquid slag in a welding process. The flux core is composed of rutile, fluoride, titanate, aluminum powder, manganese powder, chromium powder, molybdenum powder and iron powder, and mass percentages of respective components are: 15%-35% rutile, 15%-35% fluoride, 3%-7% calcium titanate, 5%-10% aluminum powder, 10%-20% manganese powder, 3%-5% chromium powder, 3%-15% molybdenum powder, and a remainder is iron powder or nickel powder. The present welding wire solves the technical problems of weld spatter and poor stability in the traditional welding process.

Abstract: A method for removal of metal ions from rice hulls. The method includes: 1) providing a water storage reactor, and disposing a gas dispersion device at the bottom of the water storage reactor; 2) bagging rice hulls, placing it in the water storage reactor, and pressing down on the bagged rice hulls to be lower than a water surface in the water storage reactor; 3) spraying industrial flue gas into the water storage reactor; controlling the amount of the industrial flue gas such that about 1 g of carbon dioxide is dissolved per 100 g of water, thus generating a carbonic acid solution; 4) allowing the carbonic acid solution to react with metal ions in the rice hulls to yield a precipitate; and 5) washing the rice hulls collected in step 4), washing again with desalinated water, and then squeezing the rice hulls.

Abstract: A method for removal of metal ions from rice hull. The method includes: 1) providing a water storage reactor, and disposing a gas dispersion device at the bottom of the water storage reactor; 2) bagging rice hull, placing it in the water storage reactor, and pressing down on the bagged rice hull to be lower than a water surface in the water storage reactor; 3) spraying industrial flue gas into the water storage reactor; controlling the amount of the industrial flue gas such that the amount of carbon dioxide dissolved in per 100 g of water is about 1 g, whereby generating a carbonic acid solution; 4) allowing the carbonic acid solution to react with metal ions in the rice hull to yield a precipitate; and 5) washing the rice hull collected in step 4), washing again with desalinated water, and then squeezing the rice hull.