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• Preparation of a highly pure liquid ammonium processing, refining phosphoric acid extraction and the Central Plains acid separation equipment and method of barium sulfate

This invention is a preparation for the high purity liquid ammonium processing, extraction phosphoric acid refining the Central Plains and barium sulfate acid separation equipment and methods, and methods belong to the field of chemical equipment. The invention includes: solvent extraction of high purity liquid ammonium processing steps, solvent extraction purification of wet process phosphoric acid used in refining the original acid treatment step, solvent extraction, refining phosphoric acid barium sulfate separation step. The advantages: in addition to the preparation of high purity ammonium impurities in the extraction liquid to prevent the stripping of the emulsification tank, can achieve the smooth and stable operation of the process; solved the solvent extraction process of refining than WPA poor production of phosphoric acid phosphate extraction of refined acidity decreased during the extraction process and extraction of the water tank caused the loss of a crystal lead to problems blocking the process tank; reduced through the filtering process in the filter.

• Efficient addition of molybdenum or tungsten APT production methods of sodium

The invention is a highly efficient addition to the role of molybdenum or tungsten APT sodium production methods. The method is based on the industry after the addition of silicon as the starting material sodium tungstate solution, in pH = 7.0 ~ 8.0 when the heat aging, with silica as a catalyst. Then add the guanidine or guanidine derivatives into the guanidine salt precipitation of tungsten, tungsten deposition rate of 98% or more, in addition to more than 95% molybdenum. Adding ammonia to precipitate in guanidine into the free base precipitation. APT solution evaporation, the crystal was Chung-acid tablets. Similarly, sodium tungsten product can be obtained. The method is simple, large capacity, in addition to high molybdenum, and tungsten APT crystallization rate of sodium a good, low cost.

• Calcium alginate entrapped ammonium phosphate compound adsorbent and its preparation and application

The present invention provides a calcium alginate-embedded composite adsorbent ammonium phosphate, ammonium phosphate is first dissolved in water to form a mass percentage of 2 to 4% of ammonium phosphate suspension; then add P ammonium molybdate 0.3 to 2 times the amount of the quality of the alginate, stirring to mix well; and then the mixture mass percentage drops to 10% of 3 calcium chloride solution, the reaction of 12 to 48 hours, get the ball products; separation washed with distilled water, dried by phosphorus ammonium calcium alginate embedded composite adsorbent. The structure of the composite adsorbent with ammonium phosphate as the core material, the calcium alginate-embedded, 2 ~ 5mm in diameter, egg-shaped ball, ammonium phosphate and calcium alginate with the mass ratio of 1:2 3:1, 90 ~ 97% moisture content, density of 0.4 ~ 0.6g · ml-1. The composite adsorbent alkali metal ions in the mixed solution of rubidium and cesium have good adsorption performance, the solution can be applied to the system from a variety of adsorption and separation, removal of rubidium, cesium ions.

• Production of non-aggregate state of the second ammonium

A non-aggregate state of the production process two molybdate, including 1]. Molybdate solution prepared by adding evaporative crystallization reactor, heated to boiling and continue to heat; 2]. When the ammonium molybdate solution when the pH = 6.9-7.5 , add two small crystals of ammonium molybdate seed; 3]. to determine the evaporation rate curve; 4]. crystal growth; 5]. filter ,100-110 ℃ drying. The invention solves the technical background of the physical indicators and produce technical problems of poor product performance. The crystallization process of improvement and fine-grained control, improving the crystal for two ammonium and particle size, the product changes from the original non-reunion reunion-like single crystals, product processing, use, good performance, by adding seed to eliminate the fine-grained control evaporation rate, the realization of the second crystal form and particle size ammonium improved physical properties of the product index also reached the international advanced level.

• Seven ammonium production methods

The present invention discloses a method of producing ammonium seven of which with ammonia solution from the organic phase containing molybdenum molybdenum stripping or desorption, making the total after stripping or desorption, or desorption from stripping solution can be seven cold crystallization of ammonium molybdate, without the need for additional energy in the intermediate steps.

• Preparation of four ammonium thiosulfate

Preparation of a four-way ammonium thiosulfate, which are high-purity chemicals to improve the preparation method. It is mainly through the use of arbitration ammonium [(NH4) 6Mo7O24 · 4H2O] or molybdenum trioxide MoO3 and ammonium sulfide [(NH4) 2S] solution reaction method to prepare high purity of the four ammonium thiosulfate [(NH4) 2MoS4 ]. Method of the present invention prepared by four high-purity ammonium thiosulfate, in which the amount of ammonium sulfide generated close to the required four stoichiometric ammonium thiosulfate, the reaction conditions ease, the reaction time is shortened, less waste discharge, the yield high, high purity, and without treatment of highly toxic, foul-smelling hydrogen sulfide gas.

• Methods used to add weight ammonium molybdenum-based catalysts to improve the performance of waste

The ammonia oxidation of a molybdenum catalyst regeneration methods, including the ammonia oxidation catalyst in the loss of molybdenum re-added to the catalyst, which uses ammonium as a supplement weight loss of the starting molybdenum catalyst material.

• Preparation of rare-earth II molybdate

The present invention discloses a preparation of rare earth molybdate II, to improve materials processing and performance, while reducing production costs, reduce environmental pollution. The ratio of soft water and ammonia 4 ~ 5L: 1L adding crystal tank, stir, then add four batches of ammonium molybdate, ammonium molybdate four: soft water: ammonia water = 1kg :4-5L: 1L, heating and stirring, the formation of mother liquor, the liquor's pH value adjusted between 7 to 8.5, slowly add to the mother liquor of cerium nitrate, yttrium nitrate or lanthanum nitrate, or combination of any two or three combinations, the cerium nitrate, yttrium nitrate or lanthanum nitrate or The combination of any two or three combined percentage of the total mass content of no more than two molybdate 2.5% of the total mass, heating evaporation 2.0 to 6.0 hours, heating temperature 100 ℃ ~ 130 ℃, until the solution clarified so far, the material released, filtration, drying, drying temperature is 110 ~ 150 ℃, for 6 to 8 hours, that was the second rare earth ammonium.

• Mechanical mixture of La-doped molybdate detection methods

The present invention provides a mechanical mixture of La-doped molybdate in the detection and determination methods, the bulk density is (0.7 ~ 1.6) g/cm3 ammonium lanthanum-doped solid sample into a glass container, according to mixed La ammonium: water = (1 ~ 2) kg: (2 ~ 3) L ratio by adding boiling water, stirring while adding volume percentage of 30% hydrogen peroxide 40 ~ 120ml, standing 5 to 15 minutes, then add the volume percentage of 15% sulfuric acid 14 to 150 ~ 220ml, stirring until completely dissolved, then filter, according to deposits on the filter paper with and without, and size, you can determine how much the number of Lanthanum whether mechanical mixture of ammonium and the inclusion volumes are within the allowable range, thus ensuring the quality of the final molybdenum products; of the present invention was 100% detection accuracy.

• Preparation of high purity ammonium Chung

The present invention provides a preparation method of high purity ammonium Zhong, including multi-ammonium molybdate as raw material, adding water and ammonia, heating the stirred ammonia solution, then the steam pressure in a certain stirring constantly for evaporation and crystallization, and maintain the tank to keep the solution boiling, concentrated mother liquor after crystallization of solid-liquid separation, the separation of ammonium after the drying Chung, Chung-ammonium in the water until reduced to ≤ 1.0g/cm3, when dissolved in the ammonia feed proportion of multi-ammonium (kg): water (1): ammonia (l) = 1: (0.20 ~ 0.25): 0.6, in the evaporative crystallization of ammonium molybdate added when more than 1000kg per EDTA 40 ~ 150g. The present invention can greatly improve product purity ammonium Chung, reached the national standard level, to meet the requirements of the electronics industry. Preparation of the present invention is simple, without adding new equipment, and preparation of product quality and stability, the crystallization rate of 94.5 to 96%.