Method for jointly producing chromium salt and ferrochromium alloy by sintering with wet and fire methods

A ferrochromium alloy, roasting technology, applied in the direction of chromium compounds, chemical instruments and methods, process efficiency improvement, etc., can solve problems such as instability, difficult smelting, lack of practical value, etc.

Inactive Publication Date: 2010-05-19
XINJIANG SING HORN GRP CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Benefits of technology

The technical effect of this patented technology described in the current inventors' approach involves combining both dry and fire processes together with an acidic solution called hydrochloric acid or nitric acid. This combination helps convert harmful chemical elements from their original sources like chrome metal while also reducing environmental concerns associated therewith during processing.

Problems solved by technology

This patents discusses different ways how heavy metals like chrome can be used during manufacturing processes such as calcining or alkaline leaching without generating harmful waste materials. However, current techniques have limitations with regards their effectiveness on reducing residual hazardous metal values from industrial sources while also improving overall efficiency.

Method used

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  • Method for jointly producing chromium salt and ferrochromium alloy by sintering with wet and fire methods
  • Method for jointly producing chromium salt and ferrochromium alloy by sintering with wet and fire methods

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings, so that those of ordinary skill in the art can implement it after referring to this specification.

[0023] Such as figure 1 Shown, the method for roasting wet method-fire method coproduction of the present invention chromium salt, ferrochrome alloy comprises the steps:

[0024] In step 101, the coarse chromite ore powder is sent to a ball mill through mechanical conveying equipment to be ground into fine chromite ore powder with a diameter less than 0.08 mm.

[0025] Step 102, mixing the fine chromite powder and sodium carbonate to form a mixture, and the mass of the sodium carbonate is 0.56-0.60 times of the theoretical amount of chromium trioxide in the fine chromite powder.

[0026] Step 103, transfer the above-mentioned mixture to a rotary kiln, and roast it under the condition of 1150° C. to 1200° C. to form primary roasted clinker, and convert the chromium trioxi...

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Abstract

The invention discloses a method for jointly producing chromium salt and ferrochromium alloy by sintering with the wet-fire methods, comprising the following steps: grinding coarse ferrochromium ore into fine ferrochromium ore powder; mixing the fine ferrochromium ore powder and sodium carbonate into mixture, and sintering the mixture into primary sintered clinker; extracting primary sodium chromate solution from the primary sintered clinker and obtaining the left primary chromium slag; separating, sintering and crushing the primary chromium slag into primary chromium slag powder, and mixing the primary chromium slag powder and sodium carbonate into mixture, and sintering the mixture into secondary sintered clinker; extracting secondary alkaline sodium chromate solution from the secondary sintered clinker and obtaining the left secondary chromium slag; adding acidic solution to neutralize the alkaline sodium chromate solution; adding sodium dichromate to the sodium chromate solution, adjusting the acidifying with sulfuric acid to form sodium dichromate solution, and separating sodium dichromate crystals from the sodium dichromate solution; mixing the secondary chromium slag and iron ore with coke powder and auxiliary materials and sintering the mixture into sintered ore; and mixing the sintered ore and coke in a blast furnace to smelt the ferrochromium alloy.

Description

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Claims

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Application Information

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Owner XINJIANG SING HORN GRP CO LTD
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