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New method for recycling vanadium, iron and chromium elements from vanadium and chromium-containing sludge

A new method, the technology of vanadium and chromium, applied in chemical instruments and methods, chromium sulfate, iron oxide, etc., can solve the problems of difficult separation, complicated technology, and difficult separation of vanadium and chromium elements, so as to achieve no three waste discharge problems and resource utilization. high rate effect

Inactive Publication Date: 2018-12-14
阜新安兴科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the process of alkali roasting not only has high energy consumption, but also the separation of vanadium and chromium elements is relatively difficult, while the separation of iron, vanadium and chromium elements in the acid leaching process is relatively difficult. Although the sub-molten salt method has certain advantages, it is difficult for the vanadium and chromium elements Extraction and separation bring new problems and the technology is more complicated
The above-mentioned problems have seriously hindered the sustainable development of the vanadium chemical industry

Method used

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  • New method for recycling vanadium, iron and chromium elements from vanadium and chromium-containing sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Undried vanadium-chromium-containing mud is used as raw material, sulfuric acid is used as leaching agent, the concentration of sulfuric acid is 5%, the amount of sulfuric acid added is twice the theoretical mass percentage of vanadium-chromium-containing mud, and the way of adding sulfuric acid is one-time addition. The liquid-solid ratio of vanadium-chromium mud is 15:1, the stirring speed is 120 rpm, the leaching temperature is 100°C, and the leaching time is 120min. After leaching, solid-liquid separation is carried out; Iron devanadium treatment, the reaction temperature is 110°C, the reaction time is 180min, and the stirring speed is 20 rpm; then solid-liquid separation is carried out, and the separated solution is a chromium sulfate solution, and the basicity is adjusted to 30% with sodium carbonate. After drying, the basic chromium sulfate product is obtained, and the product of iron and vanadium removal is directly subjected to alkali leaching treatment, the alk...

Embodiment 2

[0020] Using undried vanadium-chromium-containing mud as raw material, sulfuric acid as leaching agent, the concentration of sulfuric acid is 98%, the amount of sulfuric acid added is 0.8 times the theoretical mass percentage of vanadium-containing chromium mud, and the sulfuric acid is added dropwise. The liquid-solid ratio of chromium mud is 5:1, the stirring speed is 20 rpm, the leaching temperature is 20°C, and the leaching time is 20 minutes. After leaching, solid-liquid separation is carried out; the leached solution is deironed in a pressure reactor Vanadium removal treatment, the reaction temperature is 200°C, the reaction time is 10min, and the stirring speed is 120 rpm; then solid-liquid separation is carried out, and the separated solution is a chromium sulfate solution, and the basicity is adjusted to 40% with sodium bicarbonate. After drying, the basic chromium sulfate product is obtained, and the product of iron and vanadium removal is directly subjected to alkali...

Embodiment 3

[0022] Using undried vanadium-chromium-containing mud as raw material, sulfuric acid as leaching agent, the concentration of sulfuric acid is 75%, the amount of sulfuric acid added is 1.1 times the theoretical mass percentage of vanadium-containing chromium mud, and the adding method of sulfuric acid is dripping. The sulfuric acid solution and vanadium-containing The liquid-solid ratio of chromium mud is 10:1, the stirring speed is 60 rpm, the leaching temperature is 80°C, and the leaching time is 60 minutes. After leaching, solid-liquid separation is carried out; the leached solution is deironed in a pressure reactor Vanadium removal treatment, the reaction temperature is 160°C, the reaction time is 60min, and the stirring speed is 80 rpm; then solid-liquid separation is carried out, and the separated solution is a chromium sulfate solution, and the basicity is adjusted to 38% with sodium bicarbonate. After drying, the basic chromium sulfate product is obtained, and the produc...

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Abstract

The invention provides a new method for recycling vanadium, iron and chromium elements from vanadium and chromium-containing sludge. The method comprises the steps of completely migrating valuable metal elements in the vanadium and chromium-containing sludge into leaching solutions with an enhanced leaching method by taking sulfuric acid as leaching agents, and then performing iron and vanadium removal treatment at high temperature under high pressure to obtain relatively pure chromium sulfate solutions; performing drying treatment to the chromium sulfate solutions to obtain chromium sulfate products; alkaline-leaching iron and vanadium removal products to obtain ferric hydroxide and sodium vanadate solutions; and crystallizing the sodium vanadate solutions to obtain sodium vanadate products, and preparing iron oxide red products through high temperature drying of the ferric hydroxide. The new method is high in resource utilization rate, has no three-waste discharge problem, and is a clean and resource recovery new production technology.

Description

technical field [0001] The invention belongs to a new method for cleanly recovering vanadium, iron and chromium metal elements, and aims at the technical field of recycling vanadium, iron and chromium resources by producing vanadium-containing chromium mud in the production process of vanadium extraction. In particular, it involves the technology of deep leaching of iron, vanadium and chromium elements from vanadium-chromium mud with sulfuric acid solution, the technology of iron removal and vanadium removal from sulfuric acid solution containing vanadium, iron and chromium elements, and the separation of vanadium by alkaline leaching of iron and vanadium removal products and iron technology. Background technique [0002] Vanadium-titanium-magnetite, as one of the characteristic co-associated ores in my country, has huge reserves. The rational use of vanadium-titanium-magnetite is of great significance to our country. As an important strategic resource, iron, vanadium and ch...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/44C22B34/22C22B34/32C01G37/08C01G31/00C01G49/06
CPCC01G31/00C01G37/08C01G49/06C22B3/44C22B7/007C22B7/008C22B34/22C22B34/32Y02P10/20
Inventor 范家蓬焦丽
Owner 阜新安兴科技有限公司
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