Activation of fluoranhydrite with various chemical additives for the production of gypsum fiberboards

B. Rakhadilov, L. Bayatanova, A. Kengesbekov, S. Abdulina, M. Kylyshkanov, M.A. Podoynikov, G.S. Moldabayeva
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Abstract

Preliminary studies of fluoranhydrite as a binder showed that on its own it almost does not harden, intervention in the technological process of basic production is almost impossible, so in order to obtain materials it is necessary to develop ways of modifying it to initiate the binder properties or use “acidic” fluoranhydrite before the neutralization stage. In this work the influence of various additives (sodium sulfate and sodium sulfite, potassium sulfate, copper sulfate, iron sulfate crystallohydrate, alumina aluminate, sodium carbonate) on the properties of fluorine hydrite binders produced by neutralization of sour waste from hydrofluoric acid production with an excess of limestone was studied. In this work to obtain dependences of anhydrite binder technological properties on the number of introduced additives and determine the optimal composition of the binder, as well as create mathematical models of the processes under study and their statistical analysis used mathematical planning of the experiment. As the conducted studies showed the speed of setting of products based on anhydrite binder and their strength mainly depend on the temperature of water and its amount for mixing at the optimum dispersity of the binder. The strength of the samples made from the neutralized waste was found to be in the range of 0.5‒1.2 MPa, and the strength of the samples based on the activated anhydrite binder ― in the range of 5.3‒10.7 MPa that corresponds to the parameters of the material suitable for the production of boards.
用各种化学添加剂活化无水氟石以生产石膏纤维板
对作为粘合剂的无水氟石进行的初步研究表明,无水氟石本身几乎不会硬化,在基本生产的技术过程中几乎不可能进行干预,因此,为了获得材料,有必要开发对无水氟石进行改性的方法,以启动粘合剂特性,或者在中和阶段之前使用 "酸性 "无水氟石。在这项工作中,研究了各种添加剂(硫酸钠和亚硫酸钠、硫酸钾、硫酸铜、结晶硫酸铁、氧化铝、碳酸钠)对通过中和氢氟酸生产过程中产生的酸性废料与过量石灰石生产的氟水硬石膏粘结剂性能的影响。在这项工作中,为了获得无水石膏粘结剂技术性能与引入的添加剂数量之间的关系,确定粘结剂的最佳成分,以及建立所研究过程的数学模型,并使用数学规划实验对其进行统计分析。研究结果表明,基于无水石膏粘结剂的产品的凝固速度和强度主要取决于水的温度以及在粘结剂最佳分散度下的混合水量。用中和废料制成的样品强度在 0.5-1.2 兆帕之间,而用活化无水石膏粘合剂制成的样品强度在 5.3-10.7 兆帕之间,这符合适合生产木板的材料参数。
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