Handling method for intensified leaching-extracting recovery of iron and chromium with chromium slag and mixed acid

A technology of enhanced leaching and treatment method, which is applied in the field of chromium slag mixed acid enhanced leaching-extraction and recovery of iron and chromium, which can solve unrealized problems and achieve the effect of reducing yellowing and high purity

Active Publication Date: 2017-07-07
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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Embodiment 1

[0041] A certain chromium slag contains 3.12% of total chromium and 0.85% of hexavalent chromium. Add 6L of water, 200ml of concentrated sulfuric acid and 1500ml of hydrochloric acid to 1kg of chromium slag. After reacting at 60-80℃ for 60min, add 40g of glucose and reduce it at 80-90℃ for 3h. , then add polyether 15g and stir for 30min, stop stirring, let stand for 24h and then filter to obtain 3.56g / L of total chromium, 0.5mg / L of hexavalent chromium, and 8.7g / L of iron. Silicon dioxide 0.4g / L leaching solution. The remaining slag has a dry weight of 950g and contains 0.23% of total chromium. The washed slag is dissolved and tested according to the "Identification Standard for Hazardous Waste-Leach Toxicity Identification" (GB5085.3-2007), HJ687-2014 Alkali Digestion Method, and the water solubility The content of hexavalent chromium complies with the second-level discharge standard of "chromium salt industrial pollutant discharge standard", and the water-soluble hexavalent ...

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Abstract

The invention belongs to the technical field of intensified leaching-extracting recovery of iron and chromium with chromium slag and mixed acid, and particularly relates to a handling method for intensified leaching-extracting recovery of the iron and chromium with the chromium slag and mixed acid. According to the method, the mixed acid is used for performing intensified leaching, a reducing agent is added at the later leaching period for reducing leach liquor and hexavalent chromium in the slag, ferrum and trivalent chromium in the leach liquor are used for conducting extraction separation recovery, and thus the purposes of innocent treatment of the chromium slag and comprehensive recovery of the ferrum are achieved. When the method is used for handling the chromium slag, the hexavalent chromium and the trivalent chromium in the chromium slag can be dissolved out as far as possible, and the yellowing danger after handling of the chromium slag is lowered. The ferrum and chromium are recovered comprehensively, the purity of Fe(OH)3 and Cr(OH)3 is larger than 99.0%, and the purity of obtained ferric hydroxide and chromic hydroxide products is high.

Description

technical field [0001] The invention belongs to the technical field of chromium slag mixed acid enhanced leaching-extraction and recovery of iron chromium, and in particular relates to a treatment method for chromium slag mixed acid enhanced leaching-extraction recovery of iron chromium. Background technique [0002] Chromium element metal and its compounds are widely used in electroplating casting, chemical metallurgy, leather manufacturing, biopharmaceuticals, aerospace and other industries, and rank among the eight most competitive raw materials. The status of chromium salts in my country is even more important, and 15% of the products in the national economy are inseparable from them. The annual industrial output value of chromium salt compounds in my country in 2006 is about 4 billion. The production history of chromium salt in foreign countries is more than 200 years, and the annual output exceeds 1200kt. The production areas mainly include the United States, Russia, B...

Claims

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Application Information

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IPC IPC(8): C22B34/32C22B7/00C21B15/00
CPCC21B15/00C21B2200/00C22B7/007C22B34/32Y02P10/20
Inventor 杨志平宋艳康绍辉李大炳樊兴
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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