Dissolution behavior of various elements from steelmaking slag into seawater

The mixture of steelmaking slag,soil or sand is a candidate material for the landfill in sea shore to improve the marine environment,because the ferrous ion contained in the steelmaking slag plays an important role in promoting the growth of various seaweeds.However,the dissolution mechanism of various elements from steelmaking slag into seawater is not clarified.To reveal the dissolution behavior of various elements from steelmaking slag into seawater,the dissolution experiment of slag and seawater mixture was conducted at room temperature with changing the basicity of slag and the mass ratio of slag and seawater.It is shown that Mg ion contained in the seawater plays a buffering action obviously on pH increase which is provided by the dissolution of Ca.The dissolution behavior of Si strongly depends on the basicity of slag,at the same time the mass ratio has a conspicuous influence on it for the lower basicity of slag.The dissolution amount of Fe is little and it is discussed by using the solubility diagram.