关键词: 碳酸钙, 球霰石, 氯化钙, 碳酸钠, 晶型调控剂, 碱式碳酸镍, 高密度, 快速制备工艺

Abstract:

According to the quality requirements of HG/T 4696—2014,Industrial Basic Nickel Carbonate,a production technology of high-density basic nickel carbonate with simple preparation process and easy industrialization was developed.This topic has studied a way to feed the reaction material through pressurized spray,making the material more uniform in the reaction system,which was easy to form large particles,thereby improving the apparent density of basic nickel carbonate products.By exploring the effects of reaction temperature,reaction pH,nickel sulfate concentration,sodium carbonate con-centration and reaction speed on apparent density,the best single-factor process conditions were found and orthogonal expe-riments were carried out to obtain the optimal process conditions: at 40 ℃,using 100 g/L nickel ion concentration nickel sulfate solution to feed by pressurized spray method,the reaction pH was controlled by the automatic control system with 106 g/L sodium carbonate solution at 8.0,and the reaction speed was controlled at 300 r/min during the reaction.The basic nickel carbonate with apparent density more than 0.7 g/cm³ and low impurity content and spherical shape could be prepared.

Key words: calcium carbonate, vaterite, calcium chloride, sodium carbonate, crystallization controller, basic nickel carbonate, high-density, rapid preparation process