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Dehydration technique for carnaillite water feeding chloromagnesite

A technology of bischofite and carnallite, applied in the direction of magnesium chloride, magnesium halide, etc.

Inactive Publication Date: 2008-09-24
部燕茹 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has effectively solved the long-term problem of comprehensive utilization of magnesium resources in salt lakes, focusing on the key technology of electrolytic extraction of magnesium from bischofite and carnallite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] The invention relates to a dehydration process of adding carnallite and bischofite to produce raw materials for producing metal magnesium by electrolysis. The raw material composition of natural carnallite is potassium chloride 6-21%, sodium chloride 4-20%, calcium chloride about 2.5%, infusible matter less than 4.5%, magnesium chloride hexahydrate 30-78%, surface water 5- 25%, in actual production, its composition is all changing, in actual production need carry out process calculation according to its composition and carry out batching, in the present embodiment, the composition of carnallite is potassium chloride 12%, sodium chloride 20.775%, calcium chloride 1.5%, infusible matter 1.71%, magnesium chloride hexahydrate 41.6%, surface water 22.415%, auxiliary materials adopt 85% potassium chloride, 98% calcium chloride dihydrate. First mix 380 kg of carnallite, 320 kg of calcium chloride dihydrate, and 344.3 kg of potassium chloride, add them to the reaction kettle fo...

Embodiment 2

[0008] Produce the barium solvent that metal magnesium refines with the present invention, the raw material that adopts and auxiliary material content are with embodiment 1, earlier with 240 kilograms of carnallite, 24 kilograms of calcium chloride dihydrate, 417.3 kilograms of potassium chloride mix, join in Raise the temperature in the reaction kettle, heat it to a molten state of 750°C, slowly add 950 kg of bischofite, keep the temperature in the kettle at about 750°C, and add 90 kg of barium chloride after adding the bischofite , at 750°C for 30 minutes, 1,000 kg of product can be obtained after discharge, and 1.024 kg of hydrogen chloride gas and 730.276 kg of water vapor can be directly passed into the lime solution for neutralization and absorption. The composition of this product is potassium chloride 38.35%, calcium chloride 2.14%, sodium chloride 4.99%, barium chloride 8.87%, infusible matter 0.41%, magnesium oxide 0.05%, magnesium chloride 45.19%, and the product mee...

Embodiment 3

[0010] Produce sewage purifying agent with the present invention, the raw material that adopts and auxiliary material content are the same as embodiment 1, first 720 kilograms of carnallite, 325 kilograms of potassium chloride are mixed, join in the reactor and carry out temperature rise, be heated to the melting of 700 ℃ state, slowly add 790 kg of bischofite, and the temperature in the kettle is always controlled at about 700°C. After the bischofite is added, it is kept at 700°C for 10 minutes, and 1000 kg of product can be obtained after discharge. The 3.0695 kg of hydrogen chloride gas and 831.93 kg of water vapor produced can be absorbed by the hydrochloric acid absorption tower. The composition of this product is 14.96% of sodium chloride, 36.27% of potassium chloride, 0.16% of magnesium oxide, 47.37% of magnesium chloride, and 1.23% of infusible matter %, the product quality meets the product quality requirements of sewage purifying agent.

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Abstract

The invention belongs to the chemical field of salt lakes, in particular relates to a dehydration technology of carnallite adding bischofite, and aims at carrying out dehydration for the natural carnallite adding bischofite to prepare the refining agent of magnesium metal, raw materials for producing the magnesium metal by electrolysis, waste water purifying agent and dry powder extinguishing agent, etc. The dehydration technology has the technical processes that the dehydration technology of carnallite adding bischofite is characterized in that a certain amount of accessories is added in the carnallite to carry out mixing, added to a reaction vessel and heated to the molten state of 700 DEG C to 800 DEG C, and the bischofite is slowly added, and flashes and dehydrates instantly. At 700 DEG C to 800 DEG C, standing to preserve heat is carried out for 10 to 60 minutes, and the product can be obtained after discharging. The dehydration technology has the advantages of short technological process, low energy consumption, no pollution, simple operation, etc., thereby providing a new way for the comprehensive utilization of magnesium resources in salt lakes.

Description

1. Technical field [0001] The invention belongs to the field of salt lake chemical industry, and in particular relates to a dehydration process of carnallite and cholerite. 2. Technical background [0002] my country's salt lakes are rich in magnesium salt resources, and the reserves of Chaerhan Salt Lake in Qinghai alone are as high as 1.67 billion tons. Mainly enriched in the form of magnesium chloride hexahydrate, natural carnallite (KCl MgCl 2 ·6H 2 O), the old brine after extracting potassium (the main component is MgCl 2 ·6H 2 O) and a large amount of bischofite (MgCl 2 ·6H 2 O), due to the limitations of existing domestic technologies, resource utilization is mainly based on extracting potassium, and 8-11 tons of magnesium chloride hexahydrate will be discharged back to the lake area for every 1 ton of potassium chloride, and local enrichment will not only destroy the salt lake. The original mineral structure has also seriously affected the ecological environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/34
Inventor 部燕茹熊凯
Owner 部燕茹
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