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Reused process for waste water in calcium hydrogen orthophosphate production

A calcium hydrogen phosphate and waste water technology, applied in the fields of phosphorus compounds, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of water resource waste, high cost, environmental pollution, etc., to solve the discharge problem, reduce The effect of dosage and reduction of production cost

Inactive Publication Date: 2007-10-24
四川绵竹新清华化工有限责任公司
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Problems solved by technology

Not only the cost is high, resulting in waste of water resources, but also brings different degrees of pollution to the environment

Method used

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  • Reused process for waste water in calcium hydrogen orthophosphate production

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Embodiment Construction

[0015] The phosphate rock is crushed into a phosphate rock slurry with a water content of 30% by a ball mill. After adding sulfuric acid, it is settled and extracted to obtain wet process phosphoric acid. Before a stage of neutralization, the phosphoric acid is pretreated to remove impurities, that is, the Add 10Kg of sodium sulfate, 30Kg of diatomaceous earth, and 2Kg of ammonia hydroxyl complexing agent to rice phosphoric acid, then add 100-300Kg of lime milk, and control the pH value of the thick slurry at 2.0-2.5. A polyacrylamide precipitating agent accounting for 1% by weight is added to the thick slurry. The slurry separated by sedimentation and centrifugation can be used as phosphate fertilizer. After adding lime milk to the first-stage sedimentation water, the second-stage neutralization is carried out. At the same time, the pH value of the thick slurry is controlled at 2.5-3.5, and the thick slurry can be added 1% by weight polyacrylamide precipitation agent. The th...

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Abstract

The invention discloses a seal circulating using technique of waste water in the dicalcium orthophosphate making course after three-segment neutralizing, which is characterized by the following: adopting phosphorus ore and sulfuric acid as raw material; adding phosphoric acid into sodium sulfate, diatomaceous soil and amino-hydroxy complexing agent to predispose the impurity; adding limestone to do preliminary defluorinating and impurity removing reaction; controlling pH value between 2. 0 and 2. 5; sedimenting the dense slurry; centrifuging; separating; making the liquid do two-segment and three-segment neutralizing reaction; defluorinating and removing impurity within one step; accumulating the residual water in the reservoir; transmitting the water to each segment to circulate and use through pump. The invention can save water by 10t per ton of calcium hydrophosphate, which makes business obtain the profit and benefit and solves the discharge problem of industrial waste water.

Description

technical field [0001] The invention relates to a process for treating wastewater in the production of calcium hydrogen phosphate. Specifically, the invention relates to a process for closed-cycle use of wastewater in the production of calcium hydrogen phosphate by three-stage neutralization using phosphate rock and sulfuric acid as raw materials. Background technique [0002] The production process of calcium hydrogen phosphate has experienced more than ten years of development history in our country. At present, the commonly used method is to crush the phosphate rock with a ball mill into a phosphate rock slurry with a water content of 30%, and then extract the phosphate rock slurry with sulfuric acid. The reaction produces an extraction slurry, which is filtered to obtain wet-process phosphoric acid. After clarification, the wet-process phosphoric acid is neutralized with milk of lime for one stage. After clarification, the obtained filtrate is subjected to two or three st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C02F1/00
Inventor 高吉贵刘世俊吴跃旭布春富
Owner 四川绵竹新清华化工有限责任公司
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