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Preparation process of ammonium paratungstate

An ammonium paratungstate and preparation process technology, applied in tungsten compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of unclean discharge water treatment, low tungsten recovery rate, environmental pollution, etc. Economically sound effect

Inactive Publication Date: 2011-08-10
刘向文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the recovery rate of tungsten is not high, and on the one hand, the waste of resources is caused by the unclean treatment of the discharged water, and on the other hand, it also causes serious pollution to the environment
[0003] Take a factory with an annual output of 1,500 tons of APT as an example: a 4-ton horizontal steam boiler is used as a heat source, and wet dust removal is used for boiler smoke and exhaust gas dust removal. According to actual measurements, the desulfurization rate is only about 20% at present

Method used

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  • Preparation process of ammonium paratungstate

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Effect test

Embodiment 1

[0045] 1. After the pressure alkali leaching solution is mixed with the pre-settling solution, resin adsorption (201x7) is used to discharge the waste alkaline water. After the resin is saturated, desorb with a mixed solution of eluent ammonium chloride and ammonia water to obtain a desorption solution, and perform desorption on the desorption solution. Remove impurities to obtain product liquid, then concentrate and crystallize;

[0046] 2. After the product liquid is concentrated and crystallized, the resulting mother liquor and product washing water are sent to the ammonia distillation kettle for ammonia activation treatment. The activator used in the ammonia activation treatment is sodium hydroxide to adjust the pH value of the mother liquor to ≥ 9. Post-distillation of ammonia, the temperature of ammonia distillation is 85°C, and ammonia is recovered at the same time;

[0047] Three, the mother liquor treated in step 2 is sent to the stripping tower, and the residual ammo...

Embodiment 2

[0055] 1. After the pressure alkali leaching solution is mixed with the pre-settling solution, resin adsorption (201x7) is used to discharge the waste alkaline water. After the resin is saturated, desorb with a mixed solution of eluent ammonium chloride and ammonia water to obtain a desorption solution, and perform desorption on the desorption solution. Remove impurities to obtain product liquid, then concentrate and crystallize;

[0056] 2. After the product liquid is concentrated and crystallized, the resulting mother liquor and product washing water are sent to the ammonia distillation kettle for ammonia activation treatment. The activator used in the ammonia activation treatment is sodium hydroxide to adjust the pH value of the mother liquor to ≥ 9. Post-distillation of ammonia, the temperature of ammonia distillation is 90°C, and ammonia is recovered at the same time;

[0057] Three, the mother liquor treated in step 2 is sent to the stripping tower, and the residual ammo...

Embodiment 3

[0065] 1. After the pressure alkali leaching solution is mixed with the pre-settling solution, resin adsorption (201x7) is used to discharge the waste alkaline water. After the resin is saturated, desorb with a mixed solution of eluent ammonium chloride and ammonia water to obtain a desorption solution, and perform desorption on the desorption solution. Remove impurities to obtain product liquid, then concentrate and crystallize;

[0066] 2. After the product liquid is concentrated and crystallized, the resulting mother liquor and product washing water are sent to the ammonia distillation kettle for ammonia activation treatment. The activator used in the ammonia activation treatment is sodium hydroxide to adjust the pH value of the mother liquor to ≥ 9. Post-distillation of ammonia, the temperature of ammonia distillation is 98°C, and ammonia is recovered at the same time;

[0067] Three, the mother liquor treated in step 2 is sent to the stripping tower, and the residual ammo...

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Abstract

The invention relates to a preparation process of ammonium paratungstate, which comprises the following steps of: delivering a mother liquor generated after solidifying a product liquid into an ammonia distilling kettle, activating the mother liquor, distilling ammonia and reclaiming the ammonia at the same time; delivering the mother liquor to a stripping tower to make an NH3-N index to reach 100 to 500mg / L, transferring the mother liquor into an acidification tank, adding vitriol into the acidification tan to make the mother liquor weakly acidic; sending the acidulous liquid into an ion exchange column for absorption by a resin, desorbing the liquid with a solution of sodium hydroxide to form a concentrated solution of sodium tungstate; oxygenizing the solution of sodium tungstate; delivering the solution of sodium tungstate into a preparation kettle for a liquid before ion exchange, absorbing the solution of sodium tungstate with a resin, discharging waste alkaline water, desorbingthe solution of sodium tungstate with an eluting reagent; removing impurities from the solution of sodium tungstate; and delivering the solution of sodium tungstate from which the impurities thereof removed into the product liquid, solidifying the mixture to form the product, and performing the step 1 on the left mother liquid to recycle the mother liquid. The preparation process has the following advantages that: the recovery rate of the APT can be increased by 1 to 3 percent; the reclaimed ammonia can return to the system to be used, so the consumption of liquid ammonia is reduced; exhaust gas and water reach the first class discharging standard; the collection coefficient is over 95 percent; and the desulfurization degree is over 98 percent.

Description

technical field [0001] The invention relates to the preparation of ammonium paratungstate (APT), in particular to the recycling of mother liquor and product washing water in the production process of ammonium paratungstate. Background technique [0002] The current production method of ammonium paratungstate (APT) is to use tungsten raw materials to make product liquid, then concentrate and crystallize, and the crystallized steam part is cooled into dilute ammonia water, which cannot be returned for use. The mother liquor of crystallization and the product are washed with water, then concentrated and crystallized into secondary crystallization, and alkali and calcium chloride are added to the mother liquor of secondary crystallization to synthesize artificial scheelite. Boiler flue gas is treated with primary water or tap water, and all wastewater in the workshop is collected and sent to the environmental protection system for treatment and discharge. For this reason, flue ...

Claims

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Application Information

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IPC IPC(8): C01G41/00
Inventor 刘向文
Owner 刘向文
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