Coal is one of the most important energy sources since the industrial revolution. Coal has brought great wealth to human beings, but at the same time it has also done great damage to human living environment. As the waste produced after coal combustion, coal cinder is abandoned and piled up, which not only occupies land but also releases sulfur-containing gas to pollute the atmosphere. This office lamp combines anthracite cinder with cement. The anthracite cinder has high strength and low density, which can not only improve the strength of cement, but also reduce the weight of products.