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Preparation method of medium element water-soluble fertilizer liquid product containing calcium nitrate

A medium element and liquid product technology, which is applied in the field of preparation of medium element water-soluble fertilizer liquid products containing calcium nitrate, can solve problems affecting crops' absorption of calcium, lack of targeted supplementation of medium elements and trace elements, Unbalanced nutrient supply and other problems to achieve the effect of improving the production and operating environment, alleviating scaling problems, and eliminating NOx exhaust gas pollution

Inactive Publication Date: 2020-05-22
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for the calcium deficiency of crops is that the soil in southern my country is generally deficient in calcium, but most of the fertilizers supplied in the market are mainly high-concentration nitrogen, phosphorus and potassium elements, and the medium and trace elements are not supplemented in a targeted manner, resulting in insufficient nutrient supply. balance
Secondly, excessive use of nitrogen fertilizers, drought, salinity, etc. will affect the absorption of calcium by crops

Method used

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  • Preparation method of medium element water-soluble fertilizer liquid product containing calcium nitrate
  • Preparation method of medium element water-soluble fertilizer liquid product containing calcium nitrate
  • Preparation method of medium element water-soluble fertilizer liquid product containing calcium nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, take a 3-liter three-neck flask, add 200 ml of water as a base, and insert the pH meter below the liquid level; then, use a 1-liter measuring cylinder to hold 1.0 liter each of tin stripping waste nitric acid a and 25% milk of lime, and pass through two A peristaltic pump and a hose connect the tin stripping waste nitric acid a and milk of lime to the flask respectively. Turn on the stirring, then turn on the peristaltic pump, inject tin stripping waste nitric acid a and milk of lime into clear water at the same time for neutralization and precipitation reaction; fix the flow rate of tin stripping waste nitric acid a to 25 ml / min, adjust the flow rate of milk of lime to ensure the reaction solution The pH value is between 5 and 7. When 1 liter of tin stripping waste nitric acid a has been added, stop adding milk of lime, but continue to stir.

[0023] Then, get 20ml of the reaction slurry obtained through the above-mentioned treatment, filter with filter paper, ...

Embodiment 2

[0030] First, tap water 0.5m 3 Added to a volume of 5m 3 Reactor I, open the industrial online pH meter and stirring paddle respectively, and then start the waste tin stripping nitric acid b and 25% milk of lime feed pump, inject the waste tin stripping nitric acid b and milk of lime into the reactor I at the same time for neutralization Precipitation reaction; the flow rate of fixed tin stripping waste nitric acid b is 1m 3 / hour, adjust the lime milk flow rate to ensure that the pH value of the reaction solution is between 5 and 7; when 2m 3After the feeding of tin stripping waste nitric acid b is completed, close the tin stripping waste nitric acid and lime milk feed pump, but continue to stir.

[0031] Then, get reaction slurry 20ml, filter with filter paper, add 0.1ml heavy metal trapping agent with dropper in filtrate, be 20% sodium dimethyl dithiocarbamate solution DTC-20 in the present embodiment, have black precipitation to generate then filter mud and filtrate ar...

Embodiment 3

[0038] First, take a 3-liter three-necked flask, add 200 ml of clear water as a base, and insert the pH meter below the liquid surface; then, use a 1-liter measuring cylinder to hold 1.0 liters of copper-removing waste nitric acid c and 25% milk of lime respectively, and pass through two A peristaltic pump and a hose respectively connect waste nitric acid c and milk of lime to the flask. Turn on the stirring, then turn on the peristaltic pump, inject copper stripping waste nitric acid c and milk of lime into clear water simultaneously and carry out neutralization and precipitation reaction; fix the flow rate of copper stripping waste nitric acid c at 25 ml / min, adjust the lime milk flow rate to ensure the reaction solution The pH value is between 5 and 7. When 1 liter of copper-removing waste nitric acid A has been added, stop adding milk of lime, but continue to stir.

[0039] Then, get reaction slurry 20ml, filter with filter paper, add 0.1ml heavy metal trapping agent in f...

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Abstract

The invention relates to a preparation method of a medium element water-soluble fertilizer liquid product containing calcium nitrate. The method comprises the following steps: 1, adding a small amountof clear water as a base solution into a reactor, adding deplating waste nitric acid and 20-25% of lime milk in a parallel flow mode, keeping the pH value of the reaction solution at 5-7, and stopping feeding after reaching the set volume; 2, taking 10-20 ml of the reaction slurry, filtering, adding 0.1 ml of a heavy metal trapping agent into the filtrate in a dropwise manner, and if a black precipitate is generated, continuously adding the deplating waste nitric acid and the heavy metal trapping agent into the reactor according to a ratio of 1000:2 (V / V); 3, repeating the step 2 until the filtrate has no black precipitate, and filtering the slurry to obtain a calcium nitrate crude solution; 4, adding active carbon into the calcium nitrate crude solution to remove organic impurities, andfiltering; and 5, evaporating and concentrating the calcium nitrate solution until the specific gravity is 1.28-1.45, and cooling to room temperature to obtain a medium element water-soluble fertilizer liquid product with the calcium content of 100-160 g / L.

Description

Technical field: [0001] The invention relates to a method for preparing a liquid product of medium-weight element water-soluble fertilizer containing calcium nitrate, which belongs to the technical field of producing liquid fertilizer by using industrial waste in the surface treatment industry. Background technique: [0002] Deplating is a process in the production process of the surface treatment industry, and deplating waste nitric acid is a nitric acid type stripping agent that selectively dissolves the metal copper, nickel, Waste liquid produced by tin. For example, copper stripping waste nitric acid contains about 20-40% nitric acid and copper 50-130g / L, nickel stripping waste nitric acid contains nitric acid 20-40%, nickel content 5-50g / L, tin stripping waste nitric acid contains about 20% nitric acid ~30%, containing 50~150g / L tin, 1~20g / L copper, and 5~20g / L iron. [0003] For deplating waste nitric acid, the most commonly used pretreatment method is acid-base neut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C5/04
CPCC05C5/04
Inventor 王卫红武建刚毛朝霖廖春华陈昌铭陈向覃祚观
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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