Use of co - grinding in a process for the production of natural calcium carbonates and precipitate co - broyes, suspensions and dry pigments obtained and their uses

摘要

Use of co-grinding agents to prepare ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC), where the preparation comprises grinding an aqueous solution of GCC, optionally dispersants and/or a supporting agent, grinding an aqueous solution of PCC and optionally a dispersant, co-grinding the obtained solutions and optionally concentrating and drying the solutions. The agent is an acrylic acid homopolymer and/or copolymer, partially neutralized at a neutralization rate of less than 75 mol.%. Use of co-grinding agents to prepare ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC), where the preparation comprises grinding an aqueous solution of GCC, optionally dispersants and/or a supporting agent, grinding an aqueous solution of PCC and optionally a dispersant, co-grinding the obtained solutions and optionally concentrating and drying the solutions. The agent is an acrylic acid homopolymer and/or copolymer, partially neutralized at a neutralization rate of less than 75 mol.%, and is introduced during co-grinding step, between co-grinding and concentration steps or during the concentration step. Independent claims are included for: (1) aqueous suspensions of GCC and PCC comprising the co-grinding agent; and (2) dry pigments comprising the co-ground GCC and PCC, where PCC is present at 10-90 wt.%, preferably 30-70 wt.%.