PROCESS FOR PRODUCING A CALCIUM PHOSPHATE REACTANT, REACTANT OBTAINED AND USE THEREOF IN THE PURIFICATION OF LIQUID EFFLUENTS

A process for producing a calcium phosphate reactant, according to which: in a first step, use is made of a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted so as to obtain a Ca/P molar ratio of between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and in a second step, added to the suspension (A) are an alkaline compound comprising hydroxide ions in order to set a pH of more than 8 and an additional source of calcium in order to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6. 1. A process for producing a calcium phosphate reactant , according to which:in a first step, using a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted to obtain a Ca/P molar ratio of between 0.5 and 1.6, and reacting the source of calcium with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, andin a second step, adding to the suspension (A) an alkaline compound comprising hydroxide ions in order to set a pH of more than 8, and an additional source of calcium to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6.2. The process according to claim 1 , wherein the source of calcium comprises calcium carbonate claim 1 , calcium oxide claim 1 , calcium hydroxide claim 1 , calcium chloride claim 1 , calcium nitrate claim 1 , or calcium acetate.3. The process according to claim 1 , wherein the source of phosphate ions is phosphoric acid.4. The process according to claim 1 , wherein claim 1 , in the first step claim 1 , the Ca/P molar ratio is:between 0.50 and 1.35,or: between 1.4 and 1.6.5. The process according to claim 1 , wherein stirring of the suspension (A) and the density of suspension claim 1 , in the second step claim 1 , are adjusted in order ...

PROCESS FOR MANUFACTURING AN AQUEOUS SODIUM CHLORIDE SOLUTION

A process for manufacturing an aqueous sodium chloride solution and the use of such solution for the manufacturing of crude sodium bicarbonate from SOLVAY ammonia process or for the manufacturing of soda ash, comprising the steps of: a) dispersing a first solid material comprising sodium chloride, sodium carbonate, and sodium sulfate, and a second solid material comprising calcium chloride in an aqueous liquid to produce an aqueous medium; b) subjecting the aqueous medium to clarification to produce a clarified aqueous medium; and c) recovering the clarified aqueous medium as aqueous sodium chloride solution; wherein a weight L/S ratio between the weight of the aqueous liquid used to produce the aqueous medium and the total weight of the first solid material and the second solid material is in the range of from 0.7 to 3.5. 1. A process for manufacturing an aqueous sodium chloride solution , comprising the steps ofa) dispersing a first solid material comprising sodium chloride, sodium carbonate, and sodium sulfate, and a second solid material comprising calcium chloride in an aqueous liquid to produce an aqueous medium;b) subjecting the aqueous medium to clarification to produce a clarified aqueous medium; andc) recovering the clarified aqueous medium as aqueous sodium chloride solution; wherein a weight L/S ratio between the weight of the aqueous liquid used to produce the aqueous medium and the total weight of the first solid material and the second solid material is in the range of from 0.7 to 3.5.2. The process according to claim 1 , wherein the L/S ratio is in the range of from 1 to 2.3. The process according to claim 1 , wherein the pH of the aqueous medium in step a) is adjusted to ≦10.4. The process according to claim 1 , wherein the density of the aqueous medium in step a) is adjusted to ≧1.2 kg/l.5. The process according to claim 1 , wherein the ratio of the first solid material to the second solid material and the amounts of first and second solid ...

PROCESS FOR TREATING A GAS CONTAMINATED BY METALS OR ORGANICS COMPOUNDS USING A CALCIUM-PHOSPHATE REACTANT COMPRISING APATITE

Process for treating a gas contaminated by at least one element selected from the group consisting of heavy metals, organic compounds, and combinations thereof, wherein a calcium-phosphate reactant (reagent) particle comprising apatite is brought into contact with the contaminated gas at a temperature of at least 30° C. and preferably at most 1100° C. The metal(s) and/or organic compound(s) to be removed from the contaminated gas may be selected among the list of: Al, Ag, As, Ba, Be, Bi, Ce, Co, Cd, Cu, Cr, Fe, Hf, Hg, La, Li, Mg, Mn, Mo, Ni, Pb, Pd, Rb, Sb, Se, Sn, Sr, Th, Ti, U, V, Y, Zn, Zr, VOC, aromatic compounds, PAHs, dioxins, furans, or any mixture thereof. In such process, an alkaline compound particle comprising sodium bicarbonate, sodium carbonate, sodium sesquicarbonate (trona), quick lime, hydrated lime, lime stone or combinations thereof, may be further brought into contact with the contaminated gas. 1. A process for treating a gas stream contaminated by at least one element , said gas stream presenting peaks of concentration of the at least one element in the gas stream versus time , wherein the at least one element is selected from the group consisting of metals , organic compounds , and combinations thereof ,according to which a particulate calcium-phosphate reactant comprising apatite is brought into contact with the contaminated gas stream at a temperature of at least 30° C. and preferably at most 1100° C., (a) measuring the at least one element concentration in the contaminated gas stream,', '(b) injecting in the contaminated gas stream an alkaline compound particle selected from the group consisting of sodium bicarbonate, sodium carbonate, trona, quick lime, hydrated lime, lime stone and any mixture thereof,', '(c) injecting the calcium-phosphate reactant at a given flow-rate in the contaminated gas stream,', '(d) removing the calcium-phosphate reactant and the at least one alkaline compound that have been in contact with the contaminated gas ...

PROCESS FOR PRODUCING A CALCIUM PHOSPHATE REACTANT, REACTANT OBTAINED AND USE THEREOF IN THE PURIFICATION OF LIQUID EFFLUENTS

A process for producing a calcium phosphate reactant, according to which: in a first step, use is made of a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted so as to obtain a Ca/P molar ratio of between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and in a second step, added to the suspension (A) are an alkaline compound comprising hydroxide ions in order to set a pH of more than 8 and an additional source of calcium in order to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6. A calcium phosphate reactant obtainable by such a process. 1. A process for producing a calcium phosphate reactant , according to which:in a first step, using a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted to obtain a Ca/P molar ratio of between 0.5 and 1.6, and reacting the source of calcium with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, andin a second step, adding to the suspension (A) an alkaline compound comprising hydroxide ions in order to set a pH of more than 8, and an additional source of calcium to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6.2. The process according to claim 1 , wherein the source of calcium comprises calcium carbonate claim 1 , calcium oxide claim 1 , calcium hydroxide claim 1 , calcium chloride claim 1 , calcium nitrate claim 1 , or calcium acetate.3. The process according to claim 1 , wherein the source of phosphate ions is phosphoric acid.4. The process according to claim 1 , wherein claim 1 , in the first step claim 1 , the Ca/P molar ratio is:between 0.50 and 1.35,or: between 1.4 and 1.6.5. The process according to claim 1 , wherein stirring of the suspension (A) and the density of suspension ...

PROCESS FOR PRODUCING A PHOSPHOCALCIC REAGENT, REAGENT OBTAINED AND ITS USE

Procédé de production d'un réactif phosphocalcique selon lequel : - dans une première étape, on met en œuvre une source de calcium et une source d'ions phosphate dans de l'eau dans un rapport molaire réglé de manière à obtenir un rapport Ca/P compris entre 0,5 et 1,6, et on fait réagir la source de calcium avec les ions phosphate à un pH compris entre 2 et 8, afin d'obtenir une suspension (A) de phosphate de calcium, et - dans une deuxième étape on ajoute à la suspension (A) un composé alcalin comprenant des ions hydroxydes pour régler un pH supérieur à 8.5, et un complément de source de calcium afin d'obtenir une suspension (B) de réactif phosphocalcique ayant un rapport molaire Ca/P supérieur à 1.6. Method for producing a phosphocalcic reagent according to which: - in a first step, a source of calcium and a source of phosphate ions in water are used in a molar ratio adjusted so as to obtain a Ca / P between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and - in a second step, an alkaline compound comprising hydroxide ions is added to the suspension (A) to adjust the pH above 8.5, and a supplement of calcium source in order to obtain a suspension (B) of phosphocalcic reagent having a Ca / molar ratio P greater than 1.6.

Process for manufacturing an aqueous sodium chloride solution

Process for manufacturing an aqueous sodium chloride solution

Process for producing a calcium phosphate reactant, reactant obtained and use thereof in the purification of liquid effluents

This application concerns a process for producing a calcium phosphate reactant, according to which: - in a first step, use is made of a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted so as to obtain a Ca/P molar ratio of between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and - in a second step, added to the suspension (A) are an alkaline compound comprising hydroxide ions in order to set a pH of more than 8 and an additional source of calcium in order to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6. Further, the application concerns a method for purifying a liquid effluent containing metallic elements and or non/metallic elements with the calcium phosphate reactant obtainable by this process.

Process for producing a calcium phosphate reactant, reactant obtained and use thereof in the purification of liquid effluents

A process for producing a calcium phosphate reactant, according to which: in a first step, use is made of a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted so as to obtain a Ca/P molar ratio of between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and in a second step, added to the suspension (A) are an alkaline compound comprising hydroxide ions in order to set a pH of more than 8 and an additional source of calcium in order to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6. A calcium phosphate reactant obtainable by such a process.

Process for producing a calcium phosphate reactant

Process for producing a calcium phosphate reactant, reactant obtained and use thereof in the purification of liquid effluents

This application concerns a process for producing a calcium phosphate reactant, according to which: - in a first step, use is made of a source of calcium and a source of phosphate ions in water, in a molar ratio that is adjusted so as to obtain a Ca/P molar ratio of between 0.5 and 1.6, and the source of calcium is reacted with the phosphate ions at a pH of between 2 and 8, in order to obtain a suspension (A) of calcium phosphate, and • - in a second step, added to the suspension (A) are an alkaline compound comprising hydroxide ions in order to set a pH of more than 8 and an additional source of calcium in order to obtain a suspension (B) of calcium phosphate reactant having a Ca/P molar ratio of more than 1.6. Further, the application concerns a method for purifying a liquid effluent containing metallic elements and or non/metallic elements with the calcium phosphate reactant obtainable by this process.

PROCESS FOR PRODUCING A PHOSPHOCALCIUM REAGENT, REAGENT OBTAINED AND USE THEREOF

Procédé de production d'un réactif phosphocalcique selon lequel : - dans une première étape, on met en œuvre une source de calcium et une source d'ions phosphate dans de l'eau dans un rapport molaire réglé de manière à obtenir un rapport Ca/P compris entre 0,5 et 1,6, et on fait réagir la source de calcium avec les ions phosphate à un pH compris entre 2 et 8, afin d'obtenir une suspension (A) de phosphate de calcium, et - dans une deuxième étape on ajoute à la suspension (A) un composé alcalin comprenant des ions hydroxydes pour régler un pH supérieur à 8.5, et un complément de source de calcium afin d'obtenir une suspension (B) de réactif phosphocalcique ayant un rapport molaire Ca/P supérieur à 1.6.

Processo para produzir um reagente de fosfato de cálcio

processo para produzir um reagente de fosfato de cálcio, partícula de reagente de fosfato de cálcio, e, método de purificação de um efluente líquido. este pedido se refere a um processo para produzir um reagente de fosfato de cálcio, de acordo com o qual: - em uma primeira etapa, é feito uso de uma fonte de cálcio e uma fonte de íons fosfato em água, em uma razão molar que é ajustada de modo a obter uma razão molar ca/p de entre 0,5 a 1,6, e a fonte de cálcio é reagida com os íons fosfato a um ph de entre 2 e 8, a fim de obter uma suspensão (a) de fosfato de cálcio, e ? - em uma segunda etapa, são adicionados à suspensão (a) um composto alcalino compreendendo íons hidróxido a fim de definir um ph de mais de 8 e uma fonte adicional de cálcio a fim de obter uma suspensão (b) de reagente de fosfato de cálcio tendo uma razão molar ca/p de mais de 1,6. adicionalmente, o pedido se refere a um método para purificar um efluente líquido contendo elementos metálicos e/ou elementos não metálicos com o reagente de fosfato de cálcio obtenível por esse processo.