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Method using ammonium chloride to decompose phosphate ore and using impurities to prepare fiber cement board

A fiber cement board and ammonium chloride technology, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve the problems of low added value, small particles of calcium carbonate products, and failure to fully utilize them, and achieve the goal of improving purity Effect

Inactive Publication Date: 2018-11-13
GUIYANG KAILIN FERTILIZER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, almost all impurities in phosphogypsum enter the solid product, resulting in fine particles of calcium carbonate product, poor purity and whiteness, and low added value, making it difficult to use on a large scale; on the other hand, the phosphogypsum The conversion of calcium sulfate into calcium carbonate requires a large amount of ammonia, and the consumed ammonia is finally converted into low-value-added products such as ammonium sulfate or ammonium chloride, which leads to the difficulty of the overall technical economy
[0004] Based on this, in view of the outstanding problem that a large amount of phosphogypsum is produced by the existing traditional dihydrate wet phosphoric acid extraction process and the carbonation conversion of phosphogypsum to prepare calcium carbonate is not economical, it is necessary to find a non-phosphogypsum to produce phosphate rock. Decomposition method
[0005] Because phosphate rock contains a certain amount of silicon, acid insoluble slag mainly composed of silicon dioxide and calcium silicate is formed after decomposing phosphate rock with acid, which affects the quality of solid products, and after being separated and removed, it is usually discarded. underutilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) After crushing 200g of phosphate rock into powder, mix it with ammonium chloride solution, and stir it into a slurry. The ammonium chloride solution is saturated ammonium chloride obtained by dissolving 230g of ammonium chloride in 280ml of water at 60°C. solution;

[0046] (2) Add phosphate rock slurry to CaCl 2 Sub-molten salt, reaction 2h, the CaCl 2 sub-molten salt, is 800gCaCl 2 Mix it with 100% water by weight, stir evenly, raise the temperature to 175°C, and keep it stable to obtain;

[0047] (3) After fully reacting, add 25% water of reactant weight to the reactant to dilute, discharge, filter to obtain filtrate and filter cake respectively;

[0048] (4) the filter cake is washed with water for dechlorination, and then the filter cake is dried to obtain 2 ·nH 2 TSP with O-based acid insoluble slag impurities;

[0049] (5) will be obtained with SiO 2 ·nH 2 The double superphosphate calcium superphosphate containing acid-insoluble slag impurity mainly ...

Embodiment 2

[0054] (1) After crushing 200g of phosphate rock into powder, mix it with ammonium chloride solution, and stir it into slurry. The ammonium chloride solution is obtained by dissolving 230g of ammonium chloride in 400ml of water at 40°C. saturated solution;

[0055] (2) Add phosphate rock slurry to CaCl 2 In the sub-molten salt, react for 1h, the CaCl 2 sub-molten salt, is 800gCaCl 2 Mix it with 50% of its weight in water, stir evenly, heat up to 180°C, and keep it stable to obtain;

[0056] (3) After fully reacting, add 15% water of the weight of the reactant to the reactant to dilute, discharge, and filter to obtain filtrate and filter cake respectively;

[0057] (4) the filter cake is washed with water for dechlorination, and then the filter cake is dried to obtain 2 ·nH 2 TSP with O-based acid insoluble slag impurities;

[0058] (5) will be obtained with SiO 2 ·nH 2 The double superphosphate calcium superphosphate containing acid-insoluble slag impurity mainly O is ...

Embodiment 3

[0063] (1) After crushing 200g of phosphate rock into powder, mix it with ammonium chloride solution, and stir it into a slurry. The ammonium chloride solution is obtained by dissolving 230g of ammonium chloride in 230ml of water at 80°C. saturated solution;

[0064] (2) Add phosphate rock slurry to CaCl 2 In the sub-molten salt, react for 3h, the CaCl 2 sub-molten salt, is 800gCaCl 2 Mix it with 150% water by weight, stir evenly, raise the temperature to 170°C, and keep it stable to obtain;

[0065] (3) After fully reacting, add 40% water of reactant weight to the reactant to dilute, discharge, filter to obtain filtrate and filter cake respectively;

[0066] (4) the filter cake is washed with water for dechlorination, and then the filter cake is dried to obtain 2 ·nH 2 TSP with O-based acid insoluble slag impurities;

[0067] (5) will be obtained with SiO 2 ·nH 2 The double superphosphate calcium superphosphate containing acid-insoluble slag impurity mainly O is added...

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PUM

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Abstract

The invention relates to the technical field of utilization of industrial solid wastes, in particular to a method using ammonium chloride to decompose phosphate ore and using impurities to prepare a fiber cement board. The method comprises the following steps of using the ammonium chloride as a hidden acid medium in a CaCl2 (calcium chloride) sub-molten salt system, using the phosphate ore powderas the raw material, and reacting with the ammonia chloride in the CaCl2 sub-molten salt system to generate a triple superphosphate product and release CO2 (carbon dioxide) gas and NH3 gas, without the consumption of sulfuric acid and discharge of phosphor gypsum; dissolving the lower-purity heavy superphosphate containing SiO2.nH2O impurities into HCl (hydrochloric acid), and collecting precipitate and filtrate; adding the SiO2.nH2O precipitate into the CaCl2 sub-molten salt system, leading ammonia gas, and fully reacting at the temperature of 140 DEG C or above, so as to obtain the calcium silicate; collecting the NH3 gas by decomposing the phosphor ore, and purifying for the SiO2.nH2O to prepare the calcium silicate. The method using ammonium chloride to decompose the phosphate ore andusing the impurities to prepare the fiber cement board has the advantages that the consumption of sulfuric acid and discharge of phosphor gypsum are avoided; the impurities in the phosphor ore can befully utilized.

Description

technical field [0001] The invention relates to the technical field of phosphate rock treatment, in particular to a method for using ammonium chloride to decompose phosphate rock and using impurities to prepare fiber cement boards. Background technique [0002] Traditional heavy calcium adopts "additive" production process, and every ton of heavy calcium needs to consume at least 0.46 tons of sulfuric acid to produce 0.93 tons of phosphogypsum. [0003] Phosphogypsum is an industrial waste produced during the production of wet-process phosphoric acid. For every ton of phosphoric acid produced (in P 2 o 5 In total), generally 4-5 tons of phosphogypsum are produced. The main component of phosphogypsum is calcium sulfate dihydrate or calcium sulfate hemihydrate, and contains a small amount of quartz, undecomposed apatite, water-soluble P 2 o 5 , insoluble P 2 o 5 , eutectic P 2 o 5 , fluoride, phosphate and sulfate of fluorine, aluminum, magnesium, etc. At present, ph...

Claims

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Application Information

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IPC IPC(8): C01B25/32C04B28/00C04B18/04
CPCC01B25/32C01B25/327C04B18/0481C04B28/00C04B22/002C04B18/26Y02W30/91
Inventor 吴有丽项双龙杨昌勇张卫红廖吉星何润林唐丽君韩朝应何花王采艳蒋学华徐立钦罗付浪
Owner GUIYANG KAILIN FERTILIZER CO LTD