Ammonium dimolybdate automatic continuous crystallization production process

An ammonium dimolybdate and production process technology, applied in the directions of molybdenum compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problem that the particle size of ammonium dimolybdate products varies greatly, the control of process parameters is difficult, and the degree of automation is low. problems, to achieve the effect of wide adaptability of raw materials, uniform growth of product particle size, and low operating costs

Active Publication Date: 2016-04-20
JINZHOU TIANQIAO REFRACTORY METAL
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The former process has a low degree of automation, and the particle size and loose ratio of the ammonium dimolybdate product vary greatly between batches, which belongs to the agglomerated state, and the user's use effect is not good.
The latter water washing process has no ATM ammonia dissolution process, and its impurity removal ability is weak. Under the condition of not very good raw material quality, impurities often exceed the standard, and the control of process parameters is difficult.

Method used

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  • Ammonium dimolybdate automatic continuous crystallization production process
  • Ammonium dimolybdate automatic continuous crystallization production process

Examples

Experimental program
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Effect test

Embodiment 1

[0023] like figure 1 and figure 2 As shown, the ammonium dimolybdate continuous crystallization system is adopted, which consists of a stirred reactor, a pump, a precision filter, an ammonium molybdate solution storage tank, a liquid replenishment pump, a continuous evaporation crystallizer, a middle tank for crystal slurry, a centrifuge, a microwave drying Machine, bucket elevator, rotary vibrating screener and arm cone mixer are connected in sequence. The continuous evaporation crystallizer is divided into a heating area on the left, an evaporation concentration area on the right of the heating area and an evaporation The crystallization chamber on the lower side of the concentration zone. First, start stirring during the process of adding ATM (wet ammonium tetramolybdate) into the stirred reactor with high-purity water and liquid ammonia, and adjust the density of the ammonia solution to 1.20g / cm 3 , The pH value is 8.5, so that the temperature of the solution reaches 70...

Embodiment 2

[0026] Start stirring in the process of adding ATM (wet ammonium tetramolybdate) in the reactor of adding the mother liquor in high-purity water, liquefied ammonia and embodiment 1, adjust ammonia solution density 1.23g / cm 3 , the pH value is 8.7, so that the reaction temperature of the solution reaches 75 °C; pump into the precision filter, pressurize and filter under the pressure of 0.3MPa, the filtrate enters the ammonium molybdate solution storage tank, and then adjust the rehydration pump to keep the ammonium molybdate solution in the storage tank The amount of ammonia liquid feed in 1.6m 3 / h, circulating into the continuous evaporation crystallizer, the heating, evaporation and crystallization of the solution are simultaneously operated in the heating area, evaporation concentration area and crystallization chamber of the continuous evaporation crystallizer. The heating temperature in the heating zone is 115°C, keep the temperature in the heating zone at 103°C, stop fee...

Embodiment 3

[0029] Start stirring in the process of adding ATM (wet ammonium tetramolybdate) in the reactor of the mother liquor in adding high-purity water, liquefied ammonia and embodiment 2, adjust ammonia solution density 1.25g / cm 3 , The pH value is 8.8, so that the reaction temperature of the solution reaches 60°C; pump into the precision filter, pressurize and filter under the pressure of 0.25MPa, and the filtrate enters the ammonium molybdate solution storage tank. Then adjust the replenishment pump to keep the ammonia solution feed rate in the ammonium molybdate solution storage tank at 1.8m 3 / h, circulating into the oslo crystallizer, the heating, evaporation and crystallization of the solution are simultaneously operated in the heating zone, evaporation concentration zone and crystallization chamber of the oslo crystallizer; the heating temperature in the heating zone is 120°C, and the temperature in the heating zone is kept at 104°C, the liquid level in the evaporation concen...

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Abstract

An ammonium dimolybdate automatic continuous crystallization production process comprises the following steps: solution density, a pH value and temperature in an ammonia dissolution process in a stirring reaction still are adjusted; an ammonia dissolution solution is pumped into a precision filter for filtration, then the filtered ammonia dissolution solution enters a continuous evaporating crystallizer with a constant feed liquid feeding amount in a circulating manner, and the heating, the evaporation and the crystallization of the solution are carried out in three independent working areas, namely, a heating area, an evaporation concentration area and a crystallization chamber separately, wherein the three areas work simultaneously; crystal slurry density is controlled, after crystallization, a crystal slurry enters a crystal slurry intermediate tank so as to enter a centrifuger for solid-liquid separation, after separation, an ammonium dimolybdate crystal drops in a microwave dryer to be dried, then the product (the dried ammonium dimolybdate crystal) is conveyed to a sieving machine to be subjected to sieving through a bucket elevator, and then the sieved ammonium dimolybdate crystal enters a cantilever tapered mixer to be mixed. The production process has the advantages that not only is the ammonium dimolybdate automatic continuous crystallization production realized, but also the single crystal, large particle size and high loose ratio ammonium dimolybdate is obtained through selection of a domestic crystallizer and control of a crystallization condition.

Description

technical field [0001] The invention relates to a production process for automatic continuous crystallization of ammonium dimolybdate (ADM). Using ammonium molybdate solution as a raw material, the ammonium molybdate crystal slurry generated by a continuous crystallization device is centrifuged and dried to obtain a single crystal, Ammonium dimolybdate finished product with large particle size and high pine ratio. Background technique [0002] At present, there are two main production processes of ammonium dimolybdate (ADM), one is the kettle-type intermittent evaporation process, and the other is the water-washing method of ammonium dimolybdate continuous crystallization process. The former process has a low degree of automation, and the particle size and loose ratio of the ammonium dimolybdate product vary greatly between batches, which belongs to the agglomeration state, and the user's use effect is not good. The latter water washing process does not have an ATM ammonia-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
CPCC01G39/00C01P2004/61
Inventor 郭光华苏广全杜家森张惠谭刚
Owner JINZHOU TIANQIAO REFRACTORY METAL
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