This article introduces a mechanochemical (MC) process for the synthesis of KMgPO4 and NH4MgPO4 by milling starting materials in a planetary ball mill. First, KMgPO4 was prepared by milling KHPO4 and Mg(OH)2 at a molar ratio of 1:1 for 120 min at mill rotational speeds of 500−600 rpm. Washing of KMgPO4 in water for 700 h released only up to 20−25% of K+ and PO4
2− ions into solution. Second, NH4MgPO4 was prepared by milling NH4HPO4 and Mg(OH)2 at a molar ratio of 1:1 for 120 min at mill rotational speeds of 300−700 rpm. Washing of NH4MgPO4 in water for 500 h released only up to 10−20% of NH4
+ and PO4
2− ions into solution. The MC process could be developed to synthesize KMgPO4 and NH4MgPO4 for possible application as slow-release fertilizers.
Synthesis of potassium/ammonium phosphates and alumina composites through a mechanochemical approach is presented for the first time. γ‐alumina and the phosphate are coground and the ground products are characterized by X‐ray diffraction and infrared spectroscopy. Quantitative evaluation of the remaining soluble part of the prepared amorphous phase at a low percentage around 10% demonstrates a potential use of the ground samples as slow‐release fertilizers.
Abstract. Dolomite is one of carbonate minerals that contain magnesium. Magnesium is important element used in many aspects of life such as cofactor of many enzymes in human body, nutrient for plants, and raw material in automotive industry. Dolomite can be processed through low temperature process to obtain magnesium and calcium oxide that is needed in important applications such as base material for making drugs, raw material in the synthesize slow release fertilizer, materials for fire retardant, component for catalyst, etc. One of the important step of this low temperature process is dissolution of dolomite. Optimizing the dissolution process determines the % extraction of magnesium and calcium oxide from dolomite. The dissolution of dolomite from Gresik, East Java Provence Indonesia, in chloric acid solution has been conducted. Chloric acid concentration and pulp density are the variables that were observed. The dissolution of magnesium and calcium from Gresik dolomite was found to be very fast. The stable stage of dissolution can be reached for 5-10 seconds. The % extraction is mainly determined by the molar ratio of chloric acid / dolomite. At molar ratio of chloric acid / dolomite equal or above stoichiometric of dolomite dissolution, % extraction of magnesium is almost 100 %.
Limestone area research in Paciran area has attracted many geologists. Limestone Paciran is known to have more dolomite composition than limestone located in Tasikmalaya or other areas. The limestone facies in the area consisting of Grainstone, Packstone, and wackestone. These research methods are petrography, micropaleontology and XRD. Petrographic analysis shows that the diagenetic process has occurred, dissolution, dolomitization, and cementation. XRD analysis on the dolomite limestone are almost 31.02%, Micropaleontological analysis shows the fossils of large fores of the type of lepidocyclina which have been filled with cement and pieces of algae. The purpose of this research is to determine the composition of the dolomite minerals contained in the Paciran formation. At this time the limestones Paciran continues to be explored by miners for mining needs, dolomite as building construction, cement making, neutralizing acid in the chemical industry, magnesium and calcium sources in animal feed, flux in metal processing industry, glass making base material, ceramic, as fertilizer in the paper industry.
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