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Method for preparing feed grade calcium hydrogen phosphate co-production water glass by using slag acid and yellow phosphorus slag

A technology for yellow phosphorus slag and calcium hydrogen phosphate, which is applied in the field of preparing feed-grade calcium hydrogen phosphate co-production water glass, can solve the problems of lower quality of calcium phosphate rock, high process cost, and difficulty in industrialization, and reduce the cost of pharmaceuticals. Effect

Active Publication Date: 2016-03-16
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are big problems in this process: ①Industrial wet-process phosphoric acid and nitric acid make the process cost high; ②Phosphoric acid and yellow phosphorus slag react to produce silicic acid, which is difficult to filter and difficult to industrialize; ③The amount of filtered waste liquid is large and difficult to treat. The whole process is very costly
[0003] With the large-scale mining and utilization in recent years, the quality of calcareous phosphate rock has been declining, and a large number of low-grade siliceous and mixed collophosite have not been effectively developed and utilized.

Method used

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  • Method for preparing feed grade calcium hydrogen phosphate co-production water glass by using slag acid and yellow phosphorus slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Under normal temperature conditions, leaching 25g of yellow phosphorus slag with 100g of slag acid from the phosphoric acid industry as raw material, stirring for 0.5h at a stirring speed of 200 rpm. After crystallization, the feed grade calcium hydrogen phosphate is precipitated, and the feed grade calcium hydrogen phosphate meets the requirements of the national standard GB / T22549-2008. After adding 30% sodium hydroxide solution to the filtrate containing silicic acid and impurities, the reaction temperature is 70°C and the reaction time is After 35 minutes, the mass concentration of NaOH at the end of the reaction was 3.4 g / L. The reacted water glass is used as the inhibitor of phosphate rock flotation, and the collector is added, and the index of the phosphate concentrate after positive and negative flotation is P 2 o 5 28.92%; MgO0.68%; Fe 2 o 3 1.92%;Al 2 o 3 1.50%. Meet the raw material requirements for the production of wet-process phosphoric a...

Embodiment 2

[0027] Example 2 Under normal temperature conditions, leaching 38g of yellow phosphorus slag with 100g of slag acid from the phosphoric acid industry as a raw material, stirring for 1.5h at a stirring speed of 240 rpm. After crystallization, the feed grade calcium hydrogen phosphate is precipitated, and the feed grade calcium hydrogen phosphate meets the requirements of the national standard GB / T22549-2008. After adding 42% sodium hydroxide solution to the filtrate containing silicic acid and impurities, the reaction temperature is 80°C and the reaction time is After 55 minutes, the mass concentration of NaOH at the end of the reaction was 4.3 g / L. The reacted water glass is used as the inhibitor of phosphate rock flotation, and the collector is added, and the index of the phosphate concentrate after positive and negative flotation is P 2 o 5 28.71%; MgO0.74%; Fe 2 o 3 1.80%;Al 2 o 3 1.64%. Meet the raw material requirements for the production of wet-process phosphoric...

Embodiment 3

[0028] Example 3 Under normal temperature conditions, leaching 32g of yellow phosphorus slag with 100g of slag acid from the phosphoric acid industry as raw material, stirring for 1.0h at a stirring speed of 300 rpm. After crystallization, the feed grade calcium hydrogen phosphate is precipitated, and the feed grade calcium hydrogen phosphate meets the requirements of the national standard GB / T22549-2008. After adding 36% sodium hydroxide solution to the filtrate containing silicic acid and impurities, the reaction temperature is 95°C and the reaction time is After 40 minutes, the mass concentration of NaOH at the end of the reaction was 2.9 g / L. The reacted water glass is used as the inhibitor of phosphate rock flotation, and the collector is added, and the index of the phosphate concentrate after positive and negative flotation is P 2 o 5 28.85%; MgO0.71%; Fe 2 o 3 1.69%;Al 2 o 3 1.80%. Meet the raw material requirements for the production of wet-process phosphoric aci...

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Abstract

The invention discloses a method for preparing feed grade calcium hydrogen phosphate co-production water glass by using slag acid and yellow phosphorus slag. It uses slag acid from the phosphoric acid industry as the raw material to leach yellow phosphorus slag, and then crystallizes out feed-grade calcium hydrogen phosphate, which meets the requirements of the national standard GB / T22549-2008. The filtrate containing silicic acid and impurities is added Sodium hydroxide solution is reacted for a period of time to obtain water glass, which is used as an inhibitor of phosphate rock flotation, and the phosphate concentrate after positive and negative flotation meets the raw material requirements for the production of wet-process phosphoric acid by the dihydrate method. The method disclosed by the present invention utilizes slag acid and yellow phosphorus slag to prepare feed grade calcium hydrogen phosphate to co-produce water glass. It is also of great significance from an environmental point of view.

Description

technical field [0001] The invention particularly relates to a method for preparing feed grade calcium hydrogen phosphate co-production water glass by using slag acid and yellow phosphorus slag. It belongs to the field of phosphorus chemical industry and phosphorus ore dressing production. Background technique [0002] Yellow phosphorus slag is a solid waste produced when industrial yellow phosphorus is produced in a high-temperature electric furnace with phosphate rock, silica, coke, etc. as raw materials. The main minerals are wollastonite, lancetite, wollastonite and calcium silicate The main component is calcium silicate, and it also contains a small amount of aluminum, iron, magnesium, phosphorus, fluorine and other elements. At present, the world's yellow phosphorus production capacity exceeds 1600kt / a; there are more than 150 yellow phosphorus production enterprises in my country, more than 300 phosphorus electric furnaces, and the national yellow phosphorus producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C01B33/32
Inventor 李耀基张晖方世祥何宾宾刘丽芬罗昆义王轩翾
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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