A process for producing soil conditioner by using waste from steel mills

Abstract

The invention discloses a technology for producing a soil conditioner by using steel mill waste. The technology comprises the following steps of 1, separately collecting light burned dolomite powder and limestone powder, of which the particle sizes are between 180-250-mesh; 2, grinding potassium feldspar with a ball mill into potassium feldspar powder, wherein the particle size of the potassium feldspar powder is 450-mesh; and 3, uniformly mixing the potassium feldspar powder with the limestone powder and the dolomite powder according to different mass percentage proportions so as to obtain a mixture 1, adding bentonite of which the mass percentage is 5% as a binder to the mixture 1 to obtain a mixture 2, adding the mixture 2 into a rotary drum granulating machine, and producing the granular soil conditioner of which the particle size is 2-5mm, wherein for the soil conditioner of which the pH value is greater than 9, the ratio of various raw materials, namely the light burned dolomite powder to the limestone powder to the potassium feldspar powder to the calcium-based bentonite is 20% to 40% to 35% to 5%, and for the soil conditioner of which the pH value is smaller than 9, the ratio of various raw materials namely the light burned dolomite powder to the limestone powder to the potassium feldspar powder to the calcium-based bentonite is 30% to 10% to 55% to 5%.

Description

technical field [0001] The invention relates to a technology for producing an acidic soil conditioner by using lime powder and dolomite powder as main raw materials in a steelmaking plant through an activation process, in particular to a process for producing a soil conditioner by using waste from a steel factory. Background technique [0002] China's agricultural production has used nitrogen, phosphorus, and potassium fertilizers for more than 40 years. While using the above fertilizers, soil acidification is serious, which affects the continuity of agricultural production. Soil conditioner, as the main technical means to control acidified soil, has a history of more than 20 years in China, but most of the domestic soil conditioners are calcined limestone, dolomite, potassium feldspar, wheat Rice stone and other raw materials are then produced by crushing and granulating technology. [0003] In the steelmaking process, lime and dolomite are used for steelmaking to achieve ...