阅读说明：本技术 一种饲料级磷酸氢钙生产方法 (Production method of feed-grade calcium hydrophosphate ) 是由 孙天桥 于 2019-03-22 设计创作，主要内容包括：本发明提供一种饲料级磷酸氢钙生产方法,其特征在于包括以下几个步骤：将磷酸、水、硅藻土、硫酸钠搅拌混合后压滤的混合料,将硫酸钠与水搅拌溶解后采用循环脱重后与压滤后的混合料进行混化反应,然后进行熟化翻堆,最后进行造粒干燥后得到产品,通过对整个工艺流程的设计,开发出合理的适于大规模生产的饲料级磷酸氢钙生产方法,该方法生产的产品符合GB/T22549-2008标准。(The invention provides a production method of feed-grade calcium hydrophosphate, which is characterized by comprising the following steps: stirring and mixing phosphoric acid, water, diatomite and sodium sulfate, then performing filter pressing on the mixture, stirring and dissolving the sodium sulfate and the water, performing circulating de-weighting on the mixture and performing mixing reaction on the mixture after filter pressing, then performing curing and turning, and finally performing granulation and drying to obtain a product.)

1. A production method of feed-grade calcium hydrophosphate is characterized by comprising the following steps:

the method comprises the following steps: adding phosphoric acid, water, diatomite and sodium sulfate into a closed stirrer in proportion for stirring, and removing fluorine generated by reaction by adopting a circulating fluorine dragging process in the stirring process to obtain a mixture;

step two: filter-pressing the mixture by a plate-and-frame filter press to remove liquid, and adding the mixture into a purified acid storage tank;

step three: stirring and dissolving sodium sulfate and water, then circularly removing weight, and then removing weight and acid by plate and frame filter pressing for later use;

step four: adding the material in the purified acid storage tank in the step two, the sodium sulfate material after the heavy acid removal in the step three and the calcium carbonate powder filtered by the screen into a mixing pool for mixing reaction;

step five: conveying the mixed and reacted materials to a temporary storage warehouse through a conveyer belt for curing and turning;

step six: performing roller granulation on the cured material under the condition of adding granulation water;

step seven: drying and solidifying the granulated material in a coal gas drying mode;

step eight: and vibrating and screening the dried material to obtain a qualified product for sale and delivery.

2. The method for producing feed-grade calcium hydrogen phosphate according to claim 1, characterized in that: the stirrer adopted in the first step is a horizontal double-shaft paddle mixer.

3. The method for producing feed-grade calcium hydrogen phosphate according to claim 2, characterized in that: and in the mixing tank in the fourth step, mixing and stirring are carried out by adopting vertical four-axis differential stirring blades.

4. The method for producing feed-grade calcium hydrogen phosphate according to claim 1, characterized in that: and the bottom of the temporary storage warehouse in the fifth step is designed into a water permeable structure, and a heat exchange device is designed in the temporary storage warehouse.

5. The method for producing feed-grade calcium hydrogen phosphate according to claim 4, characterized in that: and in the fifth step, the matured turning adopts a turning mode that a crane is combined with a hydraulic grab and a bulldozer.

6. The method for producing feed-grade calcium hydrogen phosphate according to claim 5, characterized in that: and seventhly, the lignite is screened and then added into a coal gas producer to be produced in the coal gas drying.

7. A process for the production of feed grade dibasic calcium phosphate according to any one of claims 1 to 6, wherein: and seventhly, recovering small particles in the flue gas by adopting cyclone dust collection after the coal gas is dried.

Technical Field

The invention relates to the technical field of chemistry and metallurgy, in particular to a production method of feed-grade calcium hydrophosphate.

Background

The feed grade calcium hydrophosphate is calcium hydrophosphate which can be used as a supplement of phosphorus and calcium in feed processing, and can be completely dissolved in animal gastric acid because the phosphorus-calcium ratio of the calcium hydrophosphate is the closest to the phosphorus-calcium ratio of animal bones, and the feed grade calcium hydrophosphate is one of the best feed mineral additives recognized at home and abroad at present, can accelerate the growth and development of livestock and poultry, shorten the fattening period and quickly gain weight; can improve the breeding rate and survival rate of livestock and poultry, simultaneously has the functions of enhancing the disease and cold resistance of livestock and poultry, and has the prevention and treatment effects on chondropathy, white diarrhea and the like of livestock and poultry.

At present, feed-grade calcium hydrophosphate is generally produced at home and abroad by a wet process and a dry process, wherein the wet process is to add a solid raw material into a phosphoric acid solution prepared by the wet process to generate calcium hydrophosphate dissolved in water, and the calcium hydrophosphate is dried, crushed and screened to obtain a product after vacuum concentration, cooling crystallization and separation of calcium hydrophosphate crystals.

Disclosure of Invention

The invention aims to provide a production method of feed grade calcium hydrophosphate, which fully utilizes the existing production means of the feed grade calcium hydrophosphate, develops a proper production process, produces the feed grade calcium hydrophosphate with high efficiency, low consumption and environmental protection, and meets the feed requirement.

In order to achieve the purpose, the invention adopts the technical scheme that:

a production method of feed-grade calcium hydrophosphate is characterized by comprising the following steps:

the method comprises the following steps: adding phosphoric acid, water, diatomite and sodium sulfate into a closed stirrer in proportion for stirring, and removing fluorine generated by reaction by adopting a circulating fluorine dragging process in the stirring process to obtain a mixture;

step two: filter-pressing the mixture by a plate-and-frame filter press to remove liquid, and adding the mixture into a purified acid storage tank;

step three: stirring and dissolving sodium sulfate and water, then circularly removing weight, and then removing weight and acid by plate and frame filter pressing for later use;

step four: adding the material in the purified acid storage tank in the step two, the sodium sulfate material after the heavy acid removal in the step three and the calcium carbonate powder filtered by the screen into a mixing pool for mixing reaction;

step five: conveying the mixed and reacted materials to a temporary storage warehouse through a conveyer belt for curing and turning;

step six: performing roller granulation on the cured material under the condition of adding granulation water;

step seven: drying and solidifying the granulated material in a coal gas drying mode;

step eight: and vibrating and screening the dried material to obtain a qualified product for sale and delivery.

As a further improvement of the invention, the stirrer used in the first step is a horizontal double-shaft paddle mixer.

As a further improvement of the invention, a vertical four-axis differential stirring paddle is adopted in the mixing tank in the fourth step for mixing and stirring.

As a further improvement of the invention, the bottom of the temporary storage warehouse in the fifth step is designed to be a water permeable structure, and a heat exchange device is designed in the temporary storage warehouse.

As a further improvement of the invention, in the fifth step, the matured turning adopts a turning mode that a traveling vehicle is provided with a hydraulic grab and a bulldozer which are combined.

As a further improvement of the invention, in the seventh step, the gas drying is generated by screening lignite and then adding the screened lignite into a gas producer.

As a further improvement of the invention, in the seventh step, after the coal gas is dried, cyclone dust collection is adopted to recover small particles in the flue gas.

The invention has the beneficial effects of concentrating and embodying, through the design of the whole process flow, developing a reasonable feed-grade calcium hydrophosphate production method suitable for large-scale production, the product produced by the method conforms to the GB/T22549-2008 standard, the proportion of large-particle-size products is improved through roller granulation, the product quality is improved, the production cost is low, defluorination is stable, the requirement of clean production is met, the feed has the characteristics of high phosphorus content, high water-solubility content and the like, the feed can accelerate the growth and development of livestock and poultry, shorten the fattening period, rapidly increase the weight, improve the mating rate and the survival rate of the livestock and poultry, simultaneously enhance the disease and cold resistance of the livestock and poultry, and has the prevention and treatment effects on chondropathy, white dysentery and paralysis diseases of the livestock and poultry.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The invention is further illustrated with reference to fig. 1.

A production method of feed-grade calcium hydrophosphate is characterized by comprising the following steps:

the method comprises the following steps: adding phosphoric acid, water, diatomite and sodium sulfate into a closed stirrer in proportion for stirring, and removing fluorine generated by reaction by adopting a circulating fluorine dragging process in the stirring process to obtain a mixture;

step two: filter-pressing the mixture by a plate-and-frame filter press to remove liquid, and adding the mixture into a purified acid storage tank;

step three: stirring and dissolving sodium sulfate and water, then circularly removing weight, and then removing weight and acid by plate and frame filter pressing for later use;

step four: adding the material in the purified acid storage tank in the step two, the sodium sulfate material after the heavy acid removal in the step three and the calcium carbonate powder filtered by the screen into a mixing pool for mixing reaction;

step five: conveying the mixed and reacted materials to a temporary storage warehouse through a conveyer belt for curing and turning;

step six: performing roller granulation on the cured material under the condition of adding granulation water;

step seven: drying and solidifying the granulated material in a coal gas drying mode;

step eight: and vibrating and screening the dried material to obtain a qualified product for sale and delivery.

In a further preferred embodiment of the present invention, the agitator used in the first step is a horizontal twin-shaft paddle mixer.

In a further preferable scheme of the invention, a vertical four-axis differential stirring blade is adopted in the mixing tank in the fourth step for mixing and stirring.

As a further preferable scheme of the invention, the bottom of the temporary storage warehouse in the fifth step is designed to be a water permeable structure, and a heat exchange device is designed in the temporary storage warehouse.

In a further preferable scheme of the invention, the mature turning in the fifth step adopts a turning mode that a crane is provided with a hydraulic grab and a bulldozer which are combined.

In a further preferable scheme of the invention, in the seventh step, the gas drying is generated by screening lignite and then adding the screened lignite into a gas producer.

And as a further preferable scheme of the invention, in the seventh step, after the coal gas is dried, cyclone dust collection is adopted to recover small particles in the flue gas.

The feed grade calcium hydrophosphate production method is reasonable and suitable for large-scale production, the product produced by the method meets the GB/T22549-2008 standard, the proportion of large-particle-size products is improved through roller granulation, the product quality is improved, the production cost is low, defluorination is stable, the requirement of clean production is met, the feed has the characteristics of high phosphorus content, high water-solubility content and the like, the growth and development of livestock and poultry can be accelerated, the fattening period is shortened, the weight is increased rapidly, the breeding rate and the survival rate of the livestock and poultry can be improved, meanwhile, the disease resistance and cold resistance of the livestock and poultry are enhanced, and the feed has a prevention and treatment effect on chondropathy, white diarrhea and diseases of the livestock and poultry.